WO2016207926A1 - Fluid-pressure-operated clamp device - Google Patents

Fluid-pressure-operated clamp device Download PDF

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Publication number
WO2016207926A1
WO2016207926A1 PCT/JP2015/003120 JP2015003120W WO2016207926A1 WO 2016207926 A1 WO2016207926 A1 WO 2016207926A1 JP 2015003120 W JP2015003120 W JP 2015003120W WO 2016207926 A1 WO2016207926 A1 WO 2016207926A1
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WO
WIPO (PCT)
Prior art keywords
wall
working fluid
peripheral wall
clamped
tip
Prior art date
Application number
PCT/JP2015/003120
Other languages
French (fr)
Japanese (ja)
Inventor
山田 厚
Original Assignee
黒田精工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 黒田精工株式会社 filed Critical 黒田精工株式会社
Priority to PCT/JP2015/003120 priority Critical patent/WO2016207926A1/en
Priority to JP2017524144A priority patent/JP6518762B2/en
Publication of WO2016207926A1 publication Critical patent/WO2016207926A1/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B31/00Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/40Expansion mandrels
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/02Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
    • B23Q3/06Work-clamping means

Definitions

  • the present invention relates to a hydraulic clamping device, and more particularly to a hydraulic clamping device suitable for clamping small parts.
  • the optical lens As a device that clamps the optical lens during polishing, etc., the optical lens is adhered to the recess of the recess plate with an adhesive, and the optical lens is brought into close contact with the reference surface of the recess plate by vacuuming from the inside of the recess.
  • Patent Document 1 Is known (for example, Patent Document 1).
  • a working fluid chamber whose outer peripheral side is defined by a shell wall is formed in the shaft-like portion, and the working wall filled in the working fluid chamber is pressurized, so that the shell wall is expanded in the diameter direction.
  • positioned on the outer periphery of a shell wall is known (for example, patent document 3).
  • a working fluid chamber whose inner peripheral side is defined by a shell wall is formed in a cylindrical portion, and the working fluid filled in the working fluid chamber is pressurized to compress the shell wall.
  • a device that expands in the radial direction and clamps the outer contour of an object to be clamped disposed on the inner periphery of the shell wall is known (for example, Patent Document 4).
  • Patent Document 1 is suitable for clamping a small component such as an optical lens with high positional accuracy. However, since it involves the use of an adhesive, it can be efficiently and repeatedly clamped. ⁇ It is difficult to unclamp.
  • the clamp device as shown in Patent Document 2 is suitable for clamping the inner contour of a clamped object having a short axial length, but requires a mechanism including a collet chuck and a rubber sleeve for operating the collet chuck. Therefore, the structure becomes complicated.
  • the clamping device as shown in Patent Document 3 is suitable for clamping the inner contour of a cylinder having a relatively long axial length, but clamps the inner contour of a clamped object having a short axial length. Not suitable for.
  • a clamping device as shown in Patent Document 4 is suitable for clamping an outer contour of a shaft body having a relatively long axial length, but clamps an outer contour of a clamped object having a short axial length. Not suitable for.
  • the problem to be solved by the present invention is to enable proper clamping of a clamped object having a simple structure and a short axial length.
  • the hydraulic clamping device includes a clamp body (12) including a shaft portion (16) and a working fluid chamber (22, 60) formed in the shaft portion (16), and the working fluid chamber (22). , 60) and a pressurizing means (30, 32, 42) for pressurizing the working fluid filled therein, wherein the working fluid chamber (22, 60) has the shaft-like portion (16).
  • the clamp body (12) extends in the axial direction in the vicinity of the outer periphery of the shaft-like portion (16), and the clamp body (12) has an outer peripheral wall (24) that defines the outer periphery of the working fluid chamber (22, 60).
  • the extending wall (28, 56) is in the radial direction of the shaft-like portion (16) due to elastic deformation of the outer peripheral wall (24, 52) of the working fluid chamber (22, 60) due to pressurization of the working fluid. Since the object to be clamped (Wa, Wb) is clamped by the extending walls (28, 56) by displacing to (3), the object to be clamped (Wa, Wb) can be clamped with a simple structure. Since the extending walls (28, 56) are cantilevered and displaced inward in the radial direction of the shaft-like portion (16) with the tip walls (26, 54) as fulcrums, Wa, Wb) can also be clamped appropriately.
  • the hydraulic clamping device includes a clamp body (72, 112) including a cylindrical portion (77) and a working fluid chamber (82, 118) formed in the cylindrical portion (77), and the working fluid chamber.
  • a hydraulic clamping device having pressurizing means (90, 92, 102, 126, 128, 134) for pressurizing the working fluid filled in (82, 118), wherein the working fluid chamber (82, 118) Extends in the axial direction in the vicinity of the inner periphery of the cylindrical portion (77) to the vicinity of the tip of the cylindrical portion (77), and the clamp body has an inner peripheral wall that defines the inner periphery of the working fluid chamber (84, 120) and a tip wall (86, 122) defining an axial tip of the working fluid chamber (82, 118), and the inner peripheral wall (84, 120) from the tip wall (86, 122).
  • the cantilever that is displaced radially outwardly of the tubular portion (77) with the tip wall (86, 122) as a fulcrum by elastic deformation of the inner peripheral wall (84, 120) due to the pressurization of the working fluid. It has a beam-like extending wall (88, 124), and the object to be clamped (Wc, Wd, We) is clamped by the extending wall (88, 124).
  • the extending wall (88, 124) is in the radial direction of the cylindrical portion (77) by elastic deformation of the inner peripheral wall (84, 120) of the working fluid chamber (82, 118) due to pressurization of the working fluid.
  • the object to be clamped (Wc, Wd, We) is clamped by the extension walls (88, 124) by displacing the object to be clamped, so that the object to be clamped (Wc, Wd, We) can be clamped with a simple structure. it can.
  • the extending walls (88, 124) are cantilevered, which are displaced outwardly in the radial direction of the cylindrical portion (77) with the tip walls (86, 122) as fulcrums. Wc, Wd, We) can also be clamped appropriately.
  • the hydraulic clamping device is preferably configured such that the outer peripheral wall (24, 52) or the inner peripheral wall (84, 120), the tip wall (26, 54, 86, 122) and the extension wall (28, 56, 88, 124) are separate members (20, 50, 80, 116) from the main members (18, 78, 114) that constitute most of the shaft-like portion (16) or the tubular portion (77). ) Are integrated with each other.
  • the working fluid chamber (22, 60, 82, 118) can be easily defined by the main member (18, 78, 114) and the separate member (20, 50, 80, 116).
  • 24, 52) or the inner peripheral wall (84, 120), the tip wall (26, 54, 86, 122) and the extending wall (28, 56, 88, 124) are separate members (20, 50, 80, 116).
  • the tip wall (26, 54, 86, 122) becomes the tip wall (26, 54, 122).
  • 86, 122) is reliably displaced radially inward of the shaft-like portion (16) or radially outward of the tubular portion (77).
  • the distal end wall (26, 54, 86, 122) extends in a direction perpendicular to the axial direction of the axial portion (16) or the cylindrical portion (77). And a distal end surface (26A, 86A, 122A) for positioning the object to be clamped (Wa, Wb, Wc, Wd, We) in the axial direction.
  • the object to be clamped (Wa, Wb, Wc, We) is positioned in the axial direction without requiring an additional structure.
  • the outer peripheral wall (24) or the inner peripheral wall (84, 120) and the extending wall (28, 88, 124) have an annular shape with the same cross section.
  • the outer peripheral wall (52) or the inner peripheral wall (84) and the extending wall (56, 88) are preferably polygonal rings having the same cross section.
  • the shaft portion (16) or the cylindrical portion (77) has a polygonal shape, and the working fluid chamber (60, 82) and the outer peripheral wall (52) or The inner peripheral wall (84) and the extending wall (56, 88) are individually formed corresponding to each side of the polygonal shape.
  • the tip wall (26, 86) is formed with a recess (27, 87) for reducing the thickness of the tip wall (26, 86).
  • the extending wall (28, 88) with the tip wall (26, 86) as a fulcrum is easily displaced in the radial direction of the axial portion (16) or the cylindrical portion (77).
  • the extending wall is displaced in the radial direction of the axial portion or the cylindrical portion by elastic deformation of the outer peripheral wall or the inner peripheral wall of the working fluid chamber by pressurization of the working fluid. Since the clamped object is clamped by the extension wall, the clamped object can be clamped with a simple structure, and the extension wall is displaced in the radial direction of the cylindrical part with the tip wall as a fulcrum. Therefore, the clamped object having a short axial length can be appropriately clamped.
  • FIG. 6 is an enlarged sectional view of the hydraulic clamping device according to the first embodiment (corresponding to a sectional view taken along line VII-VII in FIG. 6).
  • the perspective view which shows Embodiment 3 of the hydraulic-type clamp apparatus by this invention Sectional view of hydraulic clamping device according to Embodiment 3 (equivalent to a sectional view along line IX-IX in FIG. 8)
  • the expanded sectional view of the principal part of the fluid pressure type clamp device by Embodiment 3 Explanatory drawing which shows the working principle of the fluid pressure type clamp apparatus by Embodiment 3.
  • the expanded sectional view of the principal part which shows the modification of the hydraulic clamp apparatus by Embodiment 3
  • the perspective view which shows Embodiment 4 of the hydraulic-type clamp apparatus by this invention The expanded longitudinal cross-sectional view which shows Embodiment 5 of the hydraulic-type clamp apparatus by this invention Sectional view along line XV-XV in FIG.
  • the expanded sectional view of the principal part which shows other embodiment of the hydraulic clamp apparatus by this invention The expanded sectional view of the principal part which shows other embodiment of the hydraulic clamp apparatus by this invention
  • Embodiment 1 of a fluid pressure type clamping apparatus according to the present invention will be described with reference to FIGS.
  • the fluid pressure type clamp device 10 has a clamp body 12.
  • the clamp body 12 includes a disk-shaped mounting flange portion 14, a main member 18 that constitutes a major portion of a circular cross-section shaft-shaped portion 16 extending from the mounting flange portion 14 to one side in the axial direction, And a sleeve member 20 fixed to the outer periphery of the member 18 on the front end side by brazing or the like.
  • the main member 18 and the sleeve member 20 are made of a metal material such as stainless steel, hard synthetic resin, ceramic, or the like.
  • the mounting flange portion 14 and the shaft-like portion 16 are concentric with each other.
  • the clamp main body 12 is attached to a spindle of a machine tool or the like by an attachment flange portion 14.
  • the main member 18 has a small-diameter portion 18A on the distal end side, and extends in the vicinity of the outer periphery of the shaft-shaped portion 16 in the axial direction to the vicinity of the distal end of the shaft-shaped portion 16 in cooperation with the sleeve member 20 at the small-diameter portion 18A.
  • the working fluid chamber 22 having an annular cross-sectional shape is formed.
  • the sleeve member 20 extends in the axial direction of the main member 18 to define a thin cylindrical outer peripheral wall 24 that defines the outer periphery of the working fluid chamber 22, and a direction orthogonal to the outer peripheral wall 24 (the radial direction of the main member 18).
  • An inward annular flange-shaped tip wall 26 that defines a tip in the axial direction of the working fluid chamber 22 and an extension in the axial direction of the outer peripheral wall 24 (the axial direction of the main member 18) from the tip wall 26.
  • a cylindrical extending wall 28 made of a cantilever beam extending on a line is integrally provided.
  • the tip end in the axial direction of the working fluid chamber 22 is an end portion on the same side as the tip end in the axial direction of the shaft-like portion 16 (the tip on the small diameter portion 18A side).
  • the extending wall 28 is concentric with the outer peripheral wall 24, has an axial length (axial length) shorter than the axial length of the outer peripheral wall 24, and has a radial thickness substantially equal to the radial thickness of the outer peripheral wall 24. And has an annular shape having the same cross section as that of the outer peripheral wall 24.
  • the extending wall 28 has the same cylindrical shape as the outer contour shape of the clamped object Wa having a circular cross section, receives the clamped object Wa inside, and surrounds the outer periphery (entire circumference) of the clamped object Wa.
  • the inner diameter of the extending wall 28 is set to a size that is equal to or slightly larger than the outer diameter of the workpiece Wa in a natural state.
  • the object to be clamped Wa may have a short axial length like an optical lens, and the axial dimension (extending length) of the extending wall 28 is smaller than the dimension of the clamped object Wa in the axial direction.
  • the axial dimension difference between the extending wall 28 and the workpiece Wa is at least larger than the end machining allowance, and the end face machining tool interferes with the extending wall 28. It is set to a value that does not.
  • the distal end wall 26 extends in the direction perpendicular to the axial direction of the shaft-shaped portion 16, that is, radially inward of the shaft-shaped portion 16 from the outer peripheral wall 24 and the extending wall 28 to form an annular flange shape. 18 tip surfaces 18B and the same tip surface 26A. In other words, the distal end wall 26 forms a connecting portion between the outer peripheral wall 24 and the extending wall 28, and extends in the radial direction of the shaft-shaped portion 16, thereby causing the outer peripheral wall 24 and the extending wall 28 to be connected to each other.
  • the thickness of the radial direction is thicker, and the connecting portion between the outer peripheral wall 24 and the extending wall 28 is connected to the main member 18. On the other hand, it has a fixed point that is fixed firmly.
  • the object to be clamped Wa When the object to be clamped Wa is inserted into the extension wall 28 until the tip surfaces 18B and 26A come into contact with them, the object Wa to be clamped is positioned in the axial direction and the object to be clamped Wa falls down. To prevent. Thereby, the clamped object Wa is arranged concentrically with straightness on the shaft-like portion 16.
  • a piston chamber 30 is formed in the clamp body 12 concentrically with the shaft-like portion 16.
  • a piston 32 is fitted to one end side of the piston chamber 30 so as to be movable in the axial direction.
  • the other end side of the piston chamber 30 communicates with the working fluid chamber 22 through communication holes 34 and 36 formed in the clamp body 12.
  • the working fluid chamber 22, the piston chamber 30, and the communication holes 34 and 36 define one sealed space, and the sealed space is filled and filled with hydraulic oil as an incompressible fluid.
  • a cylindrical portion 38 is formed on the opposite side of the mounting flange portion 14 from the shaft-shaped portion 16 so as to protrude concentrically with the mounting flange portion 14.
  • the cylindrical portion 38 is formed with a screw hole 40 communicating with the arrangement portion of the piston 32 on the extension of the piston chamber 30 in the axial direction.
  • the screw hole 40 opens at the distal end surface of the cylindrical portion 38 (the distal end surface opposite to the distal end surface 18B of the main member 18).
  • a male screw portion 44 of an operating screw member 42 inserted from the open end side is screwed into the screw hole 40.
  • a steel ball 48 is disposed between the male screw portion 44 and the piston 32 so as to be sandwiched between the both.
  • the operating screw member 42 has a hexagonal column portion 46 that protrudes outward from the opening end of the screw hole 40, integrally with the male screw portion 44.
  • the pressurizing means for pressurizing the working oil in the working fluid chamber 22 is configured in the clamp body 12.
  • the operating screw member 42 is turned to the screwing side by a tool such as a hexagonal spanner that engages with the hexagonal column 46 and is screwed to the right side as viewed in FIG. It moves and the pressure of the hydraulic fluid sealed by the working fluid chamber 22, the piston chamber 30, and the communicating holes 34 and 36 rises.
  • the outer peripheral wall 24 is elastically deformed so as to swell in the diameter-expanding direction of the shaft-like portion 16 due to the pressure increase of the hydraulic oil.
  • the extension wall 28 is fixed to the main member 18 of the coupling body of the outer peripheral wall 24 and the extension wall 28.
  • the distal end wall 26 is formed as a fulcrum of the insulator and is displaced inward in the radial direction of the shaft-like portion 16. By this displacement, the extending wall 28 is pressed against the outer contour of the workpiece Wa and the workpiece Wa is clamped.
  • the cantilever-shaped extending wall 28 clamps the clamped object Wa at the tip of the forceps, so even if the clamped object Wa has a short axial length like an optical lens, It can be clamped securely.
  • the extending wall 28 has the same cylindrical shape as the outer contour shape of the object to be clamped Wa and has an annular shape having the same cross-section as the outer peripheral wall 24, so that the outer peripheral wall 24 is elastically deformed over the entire region in the circumferential direction. Since it is uniformly displaced radially inward, the outer wall of the object Wa to be clamped by the extending wall 28 is clamped with high concentricity and high accuracy with respect to the shaft-like portion 16.
  • the dimension in the axial direction of the extending wall 28 is smaller than the dimension in the axial direction of the object to be clamped Wa, and the dimension difference in the axial direction between the extending wall 28 and the object to be clamped Wa is larger than the machining end face of the object to be clamped Wa. Since the dimensional difference can be set to a value at which the end face machining tool does not interfere with the extending wall 28 by setting the axial length of the extending wall 28, the axial length with which the outer contour is clamped by the hydraulic clamping device 10 is determined.
  • the end surface processing of the short workpiece Wa can be performed without hindrance.
  • the object to be clamped Wa is inserted into the extension wall 28 until it comes into contact with the front end surfaces 18B and 26A, whereby the object to be clamped Wa is positioned in the axial direction and the object to be clamped Wa falls down. Is prevented. Thereby, the workpiece Wa is clamped concentrically with high straightness with respect to the shaft-like portion 16.
  • the hydraulic clamping device 10 can appropriately clamp and unclamp the clamped object Wa having a short shaft length with a simple structure without requiring many components.
  • the corner portion connecting the tip wall 26 and the outer peripheral wall 24 and the corner portion connecting the tip wall 26 and the extension wall 28 are used.
  • An annular recess 27 that reduces the thickness of the tip wall 26 may be formed.
  • the concave portion 27 If the concave portion 27 is provided, it becomes easy for the extending wall 28 to displace the tip wall 26 radially inward of the shaft-like portion 16 like the fulcrum of the insulator, and the internal pressure of the working fluid chamber 22 increases. Even if there is little, clamping of the to-be-clamped object Wa by the extension wall 28 will be performed with a required clamping force.
  • FIG. 6 and FIG. 6 and 7 parts corresponding to those in FIGS. 1 to 3 are given the same reference numerals as those in FIGS. 1 to 3, and description thereof is omitted.
  • the fluid pressure type clamping device 10 of the second embodiment is intended for clamping a triangular object Wb having a short axial length such as a bite tip, and the tip side of the main member 18 is a triangular prism portion 18C having a triangular cross section. It has become.
  • a shallow concave portion 18D having a rectangular planar shape is formed in a rectangular flat portion for each side of the triangular prism portion 18C.
  • a plate-like member 50 is fixed to a flat portion for each side of the triangular prism portion 18C by brazing or the like.
  • the three plate-like members 50 each have a rectangular flat plate-like outer peripheral wall (outer wall) 52 that blocks the opening of the recess 18D and defines the outer periphery of the working fluid chamber 60, and a direction (main member 18) perpendicular to the outer peripheral wall 52.
  • a rectangular piece-like tip wall 54 that defines the tip of the working fluid chamber 22 in the axial direction, and an extension of the outer peripheral wall 52 in the axial direction (axis direction of the main member 18) from the tip wall 54.
  • a rectangular piece-like extension wall 56 is integrally formed by a cantilever beam extending on the line. In this manner, the working fluid chamber 60, the outer peripheral wall 52, and the extending wall 56 are individually formed corresponding to each triangular side.
  • the tip in the axial direction of the working fluid chamber 60 is the end on the same side as the tip in the axial direction of the shaft-like portion 16 (tip on the side of the triangular prism portion 18C).
  • the three extending walls 56 have a length in the axial direction (axial length) shorter than the length in the axial direction of the outer peripheral wall 52 and have a plate thickness substantially equal to the plate thickness of the outer peripheral wall 52.
  • a triangular shape equivalent to the outer contour shape of the clamped object Wb is formed, and the clamped object Wb is received inside and joined to each side of the clamped object Wb.
  • the triangular shape formed by the three extending walls 56 is set to a dimension that is equal to or slightly larger than the outer dimension of the clamped object Wb in a natural state.
  • the dimension (extension length) in the axial direction of the extending wall 56 is smaller than the dimension in the axial direction of the clamped object Wb.
  • the axial dimension difference between the extension wall 56 and the workpiece Wb is at least larger than the machining allowance of the end face, and the end face machining tool interferes with the extension wall 56. It is set to a value that does not.
  • the three working fluid chambers 60 communicate with the piston chamber 30 through the communication holes 34 and 36.
  • the pressurizing means that pressurizes the hydraulic fluid in the working fluid chamber 60 including the piston chamber 30 is configured in the clamp body 12 as in the first embodiment.
  • each outer peripheral wall 52 When the pressure of the working oil in the working fluid chamber 60 rises due to the screwing of the working screw member 42, each outer peripheral wall 52 is elastically deformed so as to swell in the diameter increasing direction of the shaft-like portion 16.
  • each extended wall 56 is connected to the outer peripheral wall 52 and the extended wall 56 as shown in FIG.
  • the distal end wall 54 that forms a fixed point with respect to the main member 18 of the body is displaced radially inward of the shaft-like portion 16 like a fulcrum of the insulator. By this displacement, each extending wall 56 is pressed against the outer contour of the clamped object Wb, and the clamped object Wb is clamped.
  • the cantilevered extending wall 56 clamps the object to be clamped Wb at the tip of the forceps so that the object to be clamped Wb has a short axial length like an optical lens. It can be clamped securely.
  • the three plate-like members 50 and the working fluid chamber 60 have the same structure, the three extending walls 56 are uniformly displaced radially inward from each other. Clamping of the outer contour of Wb is performed with high concentricity and high accuracy with respect to the shaft-like portion 16.
  • the axial dimension of the extending wall 56 is smaller than the axial dimension of the clamped object Wb, and the axial dimension difference between the extending wall 56 and the clamped object Wb is larger than the end face machining allowance of the clamped object Wb. Since the dimensional difference can be set to a value at which the end face machining tool does not interfere with the extending wall 56 by setting the axial length of the extending wall 56, the outer contour is clamped by the hydraulic clamping device 10 as in the first embodiment. The end face machining of the clamped object Wb having a short axial length can be performed without hindrance.
  • the object to be clamped Wb is inserted inside the extending wall 56 until it comes into contact with the tip surface of the tip wall 54 and the tip surface of the triangular prism portion 18C, whereby the object to be clamped Wb is positioned in the axial direction.
  • the to-be-clamped object Wb is prevented from falling down. Thereby, the workpiece Wb is clamped concentrically with high straightness with respect to the shaft-like portion 16.
  • the pressure of the working oil in the working fluid chamber 60 decreases.
  • the pressure of the working oil returns to the original state (substantially atmospheric pressure)
  • the elastic deformation of the outer peripheral wall 52 occurs.
  • the extended wall 56 returns to its original state.
  • the extension wall 56 is released from being pressed against the outer contour of the clamped object Wb, and the clamp of the clamped object Wb is released.
  • the hydraulic clamping device 10 can appropriately clamp and clamp the workpiece Wb having a simple structure and a short axial length without requiring many components as in the first embodiment. Can be unclamped.
  • Embodiment 3 of the hydraulic clamping device according to the present invention will be described with reference to FIGS.
  • the fluid pressure type clamp device 70 has a clamp body 72.
  • the clamp main body 72 includes a disk-shaped mounting flange portion 74 and a main member 78 constituting most of a circular cross-section shaft-shaped portion 76 extending from the mounting flange portion 74 to one side in the axial direction, and a shaft And a thin sleeve member 80 fixed to the inner periphery of a cylindrical portion 77 having an annular cross-sectional shape formed on the distal end side of the shape portion 76 by brazing or the like.
  • the main member 78 and the sleeve member 80 are made of a metal material such as stainless steel, hard synthetic resin, ceramic, or the like.
  • the mounting flange portion 74, the shaft portion 76, and the cylindrical portion 77 are concentric with each other.
  • the clamp main body 72 is attached to the spindle of the machine tool or the like by an attachment flange portion 74.
  • the cylindrical part 77 constitutes a working fluid chamber 82 having an annular cross section extending in the axial direction to the vicinity of the tip of the cylindrical part 77 in cooperation with the sleeve member 80 in the axial direction.
  • the sleeve member 80 extends in the axial direction of the main member 78 and defines a cylindrical inner peripheral wall 84 that defines the inner periphery of the working fluid chamber 82, and a direction orthogonal to the inner peripheral wall 84 (the radial direction of the main member 78).
  • An outwardly extending annular flange-like tip wall 86 that extends to define the tip of the working fluid chamber 82 in the axial direction, and an extension line in the axial direction of the inner peripheral wall 84 (the axial direction of the main member 78) from the tip wall 86
  • a cylindrical extending wall 88 formed of a cantilever beam extending in a single-piece manner.
  • the tip end in the axial direction of the working fluid chamber 82 is an end portion on the same side as the tip end in the axial direction of the shaft-like portion 76 (tip on the cylindrical portion 77 side).
  • the extension wall 88 is concentric with the inner peripheral wall 84, has an axial length (axis length) shorter than the axial length of the inner peripheral wall 84, and has a radial thickness substantially equal to the radial thickness of the inner peripheral wall 84. And has an annular shape having the same cross section as the inner peripheral wall 84.
  • the extension wall 88 has the same cylindrical shape as the inner contour shape of the annular clamped object Wc, receives the clamped object Wc on the outside, and surrounds the inner periphery (entire circumference) of the clamped object Wc.
  • the outer diameter of the extending wall 88 is set to a dimension that is equal to or slightly smaller than the inner diameter of the clamped object Wc in a natural state.
  • the object to be clamped Wc has a short axial length, and the dimension of the extending wall 88 in the axial direction (extended length) is smaller than the dimension of the object to be clamped Wc in the axial direction.
  • the axial dimension difference between the extending wall 88 and the workpiece Wc is at least larger than the end face machining allowance, and the end face machining tool interferes with the extending wall 88. It is set to a value that does not.
  • the tip wall 86 extends in the direction perpendicular to the axial direction of the shaft-shaped portion 76, that is, radially outward of the shaft-shaped portion 76 from the inner peripheral wall 84 and the extending wall 88, and forms an annular flange shape.
  • 78 has a tip surface 78A that is flush with the tip surface 78A.
  • the distal end wall 86 forms a connecting portion between the inner peripheral wall 84 and the extending wall 88, and extends in the radial direction of the shaft-shaped portion 76, thereby causing the inner peripheral wall 84 and the extending wall 88 to be connected to each other.
  • the wall thickness in the radial direction is higher than that of the inner peripheral wall 84 and the extension wall 88.
  • it has a fixed point that is fixed firmly.
  • the tip surfaces 78A and 86A are positioned in the axial direction of the object to be clamped Wc until the object to be clamped Wc is inserted outside the extension wall 88 until they are in contact with them, and the object to be clamped Wc falls down. To prevent. Thereby, the clamped object Wc is arranged concentrically with straightness on the shaft-like portion 76.
  • a piston chamber 90 is formed in the main member 78 concentrically with the shaft-like portion 76.
  • a piston 92 is fitted to one end side of the piston chamber 90 so as to be movable in the axial direction.
  • the other end side of the piston chamber 90 communicates with the working fluid chamber 82 through communication holes 94 and 96 formed in the main member 78.
  • the working fluid chamber 82, the piston chamber 90, and the communication holes 94 and 96 define one sealed space, and the sealed space is filled and filled with hydraulic oil as an incompressible fluid.
  • a cylindrical portion 98 is formed concentrically with the mounting flange portion 74 on the side opposite to the shaft-shaped portion 76 of the mounting flange portion 74.
  • a screw hole 100 communicating with the arrangement portion of the piston 92 is formed in the columnar portion 98 on the extension of the piston chamber 90 in the axial direction.
  • the screw hole 100 is open to the distal end surface of the cylindrical portion 98 (the distal end surface opposite to the distal end surface 78A of the main member 78).
  • a male screw portion 104 of an operating screw member 102 inserted from the open end side is screwed into the screw hole 100.
  • a steel ball 108 is disposed between the male screw portion 104 and the piston 92 so as to be sandwiched between the two.
  • the operating screw member 102 has a hexagonal column portion 106 that projects outward from the opening end of the screw hole 100, and the male screw portion 104.
  • a pressurizing unit that pressurizes the hydraulic oil in the working fluid chamber 82 is configured in the clamp body 72.
  • the operating screw member 102 is turned to the screwing side by a tool such as a hexagonal spanner engaged with the hexagonal column portion 106, and when screwed to the right side in FIG. 9, the piston 92 is axially moved to the right side via the steel ball 108. It moves and the pressure of the hydraulic fluid sealed in the working fluid chamber 82, the piston chamber 90 and the communication holes 94 and 96 rises.
  • the inner peripheral wall 84 is elastically deformed so as to swell in the direction of diameter reduction of the shaft-like portion 76 due to the pressure increase of the hydraulic oil.
  • the extension wall 88 is fixed to the main member 78 of the coupling body of the inner peripheral wall 84 and the extension wall 88.
  • the distal end wall 86 forming the above is displaced outwardly in the radial direction of the shaft-like portion 76 like a fulcrum of the insulator.
  • the cantilevered extension wall 88 clamps the clamped object Wc at the tip of the forceps so that the clamped object Wc can be reliably clamped even if the clamped object Wc has a short axial length. Can do.
  • the extending wall 88 has the same cylindrical shape as the inner contour shape of the clamped object Wc and has an annular shape having the same cross section as that of the inner peripheral wall 84, so that it extends over the entire region in the circumferential direction by elastic deformation of the inner peripheral wall 84. Since it is displaced uniformly inward in the radial direction, the outer wall of the clamped object Wc is clamped by the extending wall 88 with high concentricity and high accuracy with respect to the shaft-like portion 76.
  • the axial dimension of the extending wall 88 is smaller than the axial dimension of the clamped object Wc, and the axial dimension difference between the extending wall 88 and the clamped object Wc is larger than the end face machining allowance of the clamped object Wc. Since the dimensional difference can be set to a value at which the end face machining tool does not interfere with the extending wall 88 by setting the axial length of the extending wall 88, the axial length whose outer contour is clamped by the hydraulic clamping device 10 is The end face processing of the short clamped object Wc can be performed without hindrance.
  • the object to be clamped Wc is inserted outside the extending wall 88 until it abuts against the tip surfaces 78A and 86A, whereby the object to be clamped Wc is positioned in the axial direction and the object to be clamped Wc falls down. Is prevented. Thereby, the clamped object Wc is clamped concentrically with high straightness with respect to the shaft-like portion 76.
  • extension wall 88 When the extension wall 88 returns to the original state, the extension wall 88 is released from being pressed against the inner contour of the workpiece Wc, and the clamp of the workpiece Wc is released.
  • the hydraulic clamping device 70 can appropriately clamp and unclamp the clamped object Wc having a short shaft length with a simple structure without requiring many components.
  • the corner portion connecting the tip wall 86 and the inner peripheral wall 84 and the corner portion connecting the tip wall 86 and the extension wall 88 are connected.
  • An annular recess 87 that reduces the thickness of the tip wall 86 may be formed.
  • the extension wall 88 can easily displace the distal end wall 86 radially outward of the shaft-like portion 76 like a fulcrum of the insulator, and the internal pressure of the working fluid chamber 82 increases. Even if there is little, clamping of the to-be-clamped object Wc by the extension wall 88 will be performed with a required clamping force.
  • Embodiment 4 of the hydraulic clamping device according to the present invention will be described with reference to FIG.
  • portions corresponding to those in FIG. 8 are denoted by the same reference numerals as those in FIG. 8, and description thereof is omitted.
  • the inner cylindrical part of the cylindrical part 77 has a quadrangular cross-sectional shape.
  • the inner peripheral wall 84 and the extending wall 88 are formed in a rectangular tube shape while being in the shape of a plane.
  • the configuration is substantially the same as that of the third embodiment. Therefore, the same effect as in the third embodiment can be obtained in the fourth embodiment.
  • the inner peripheral wall 84, the tip wall 86, and the extending wall 88 are integrated with the shaft-like portion 76.
  • Embodiment 5 of a hydraulic clamping device according to the present invention will be described with reference to FIGS.
  • the fluid pressure type clamp device 110 has a cylindrical clamp body 112.
  • the clamp body 112 forms a cylindrical portion as a whole, and includes a main member 114 that constitutes a major portion of the cylindrical shape, and a sleeve member 116 that is fixed to the inner periphery of the main member 114 by brazing or the like.
  • the main member 114 and the sleeve member 116 are made of a metal material such as stainless steel, hard synthetic resin, ceramic, or the like.
  • the main member 114 constitutes a working fluid chamber 118 having an annular cross section extending in the axial direction to the vicinity of the end face of the main member 114 in cooperation with the sleeve member 116.
  • the sleeve member 116 includes a thin cylindrical inner peripheral wall 120 that extends in the axial direction of the main member 114 and defines the inner periphery of the working fluid chamber 118, and a direction orthogonal to the inner peripheral wall 120 (the radial direction of the main member 114 ) Extending outwardly to define the axial tip of the working fluid chamber 118, and the axial direction of the inner peripheral wall 120 from the tip wall 122 (the axial direction of the main member 114).
  • a cylindrical extension wall 124 is integrally formed by a cantilever beam extending on the extension line. Note that the tip of the working fluid chamber 118 in the axial direction is the end on the same side as the vicinity of the end face of the main member 114 described above.
  • the extension wall 124 is concentric with the inner peripheral wall 120, has an axial length (axial length) shorter than the axial length of the inner peripheral wall 120, and has a radial thickness substantially equal to the radial thickness of the inner peripheral wall 120. And has an annular shape having the same cross section as the inner peripheral wall 120.
  • the extending wall 124 has the same cylindrical shape as the inner contour shape of the annular clamped object We, receives the clamped object We on the outside, and surrounds the inner periphery (entire circumference) of the clamped object We.
  • the outer diameter of the extension wall 124 is set to a dimension that is equal to or slightly smaller than the inner diameter of the workpiece We in the natural state.
  • the clamped object We has a short axial length, and the axial dimension (extension length) of the extension wall 124 is smaller than the axial dimension of the clamped object We.
  • the dimensional difference between the extending wall 124 and the workpiece We in the axial direction is at least larger than the end surface machining allowance, and the end surface machining tool interferes with the extending wall 124. It is set to a value that does not.
  • the distal end wall 122 has a wall thickness (thickness in the axial direction) that is thicker than the inner peripheral wall 120 and the extending wall 124 and is perpendicular to the axial direction of the main member 114, that is, the inner wall 120 and the extending wall 124.
  • the member 114 extends outward in the radial direction to form an annular flange shape, and has a front end surface 122A that is flush with the front end surface 114A of the main member 114.
  • the tip wall 122 forms a connecting portion between the inner peripheral wall 120 and the extending wall 124, and extends in the radial direction of the main member 114 with a thickness greater than the inner peripheral wall 120 and the extending wall 124.
  • it has a higher rigidity than the inner peripheral wall 120 and the extension wall 124 and serves as a fixing point for firmly fixing the connecting portion between the inner peripheral wall 120 and the extension wall 124 to the main member 114. Yes.
  • the tip surfaces 114A and 122A are positioned in the axial direction of the object to be clamped Wel and the object to be clamped We fall down by inserting the object to be clamped Wel outside the extending wall 124 until they abut against them. To prevent. Thereby, the clamped object We is disposed concentrically with straightness on the clamp body 112.
  • a piston chamber 126 is formed in the main member 114.
  • a piston 128 is fitted to one end side of the piston chamber 126 so as to be movable in the longitudinal direction of the piston chamber 126.
  • the other end side of the piston chamber 126 communicates with the working fluid chamber 118 through a communication hole 130 formed in the main member 114.
  • the working fluid chamber 118, the piston chamber 126, and the communication hole 130 define one sealed space, and the sealed space is filled and filled with hydraulic oil as an incompressible fluid.
  • the main member 114 is formed with air vent holes 140 and 142 for venting the working fluid chamber 118 and the piston chamber 126 when the hydraulic oil is filled.
  • the air vent holes 140 and 142 are closed by seal screws 144 and 146 after the air venting action.
  • the main member 114 is formed with a screw hole 132 communicating with the arrangement portion of the piston 128 on the extension of the piston chamber 126 in the axial direction.
  • the screw hole 132 opens on the outer peripheral surface of the main member 114.
  • An operating screw member 134 inserted from the opening end side is screwed into the screw hole 132.
  • a steel ball 136 is disposed between the operating screw member 134 and the piston 128 so as to be sandwiched therebetween.
  • a pressurizing unit that pressurizes the hydraulic oil in the working fluid chamber 118 is configured in the clamp body 112.
  • the operating screw member 134 is a screw member with a hexagonal hole, and is rotated to the screwing side by a tool such as a hexagon wrench.
  • a tool such as a hexagon wrench.
  • the piston 128 moves upward via the steel ball 136.
  • the inner peripheral wall 120 is elastically deformed so as to swell in the direction of diameter reduction of the clamp body 112 due to the pressure increase of the hydraulic oil.
  • the extension wall 124 is fixed to the main member 114 of the coupling body of the inner peripheral wall 120 and the extension wall 124.
  • the distal end wall 122 is formed like a lever fulcrum and is displaced radially outward of the clamp body 112. By this displacement, the extension wall 124 is pressed against the circular inner contour of the clamped object We, and the clamped object We is clamped.
  • the cantilever-like extending wall 124 clamps the clamped object We at the tip of the forceps so that the clamped object We can be reliably clamped even if the clamped object We has a short axial length. Can do.
  • the extending wall 124 has the same cylindrical shape as the inner contour shape of the clamped object We and has an annular shape having the same cross section as that of the inner peripheral wall 120, so that it extends over the entire region in the circumferential direction due to elastic deformation of the inner peripheral wall 120. Since the inner wall of the clamped object We is clamped by the extending wall 124 with high concentricity with high concentricity, it is uniformly displaced radially inward.
  • the axial dimension of the extending wall 124 is smaller than the axial dimension of the clamped object We, and the axial dimension difference between the extending wall 124 and the clamped object We is larger than the end face machining allowance of the clamped object We; Since the dimensional difference can be set to a value at which the end face machining tool does not interfere with the extending wall 124 by setting the axial length of the extending wall 124, the axial length whose outer contour is clamped by the hydraulic clamping device 110 is reduced.
  • the end face processing of the short clamped object We can be performed without hindrance.
  • the hydraulic clamping device 110 can appropriately clamp and unclamp a workpiece We having a short shaft length with a simple structure without requiring many components.
  • the workpieces Wa to We are clamped by the increase in the internal pressure of the working fluid chamber 22, 60, 82, or 118, and the internal pressure of the working fluid chamber 22, 60, 82, or 118 is set to atmospheric pressure or high.
  • the object to be clamped Wa to We is unclamped by returning to the default state near the atmospheric pressure, but the object to be clamped Wa is in the default state where the internal pressure of the working fluid chamber 22, 60, 82 or 118 is atmospheric pressure or near atmospheric pressure.
  • the clamped objects Wa to We can be unclamped by clamping the pressures We to We and increasing the internal pressure of the working fluid chambers 22, 60, 82 or 118.
  • the embodiment shown in FIG. 16 has the same configuration as that of the first embodiment, and the working fluid chamber 22 has a default state in which the internal pressure of the working fluid chamber 22 is atmospheric pressure or near atmospheric pressure, and the extending wall 28 has an annular outer diameter. Since the inner diameter of the clamped object We is larger than that of the clamped object We, the inner contour of the clamped object We is clamped on the outer periphery of the extension wall 28, and the extension wall 28 is displaced radially inward due to the increase in the internal pressure of the working fluid chamber 22. Then, unclamping of the workpiece We is performed.
  • annular positioning flange 21 for positioning the workpiece We in the axial direction may be formed on the outer periphery of the sleeve member 20.
  • the embodiment shown in FIG. 17 has the same configuration as that of the third embodiment, and the internal pressure of the working fluid chamber 82 is the atmospheric pressure or the default state near atmospheric pressure, and the extending wall 88 has a disk-like inner diameter. Since the outer diameter of the object Wa is smaller, the outer contour of the object to be clamped Wa is clamped on the inner periphery of the extension wall 88, and the extension wall 88 is displaced radially outward by the increase in the internal pressure of the working fluid chamber 82. In this way, the workpiece Wa is unclamped.
  • annular positioning flange 81 for positioning the workpiece Wa in the axial direction may be formed on the inner periphery of the sleeve member 80.
  • the outer peripheral wall 24, the distal end wall 26, the extending wall 28, the outer peripheral wall 52, the distal end wall 54, and the extending wall 56 are the sleeve member 20 and the plate-like member 50 that are separate parts from the main member 18. However, these may be formed integrally with the main member 18 without using separate parts. Further, the inner peripheral wall 84, the tip wall 86, the extending wall 88, the inner peripheral wall 120, the tip wall 122, and the extending wall 124 are also integrated with the main member 78 or 114 without using separate parts such as the sleeve members 80 and 116. It may be configured.
  • the pressurizing means for pressurizing the hydraulic oil in the working fluid chamber 22 may be separately placed from the clamp body 12 and remotely operated.
  • the pressurizing means may have a structure that pushes the piston 32, the piston rod, or the like using an actuator, a cam mechanism, or the like.

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Abstract

The present invention relates to a clamp having a simple structure and capable of clamping an object to be clamped having a small axial length. A fluid-pressure-operated clamp device has: a clamp body (12) including a shaft-like section (16) having an operating fluid chamber (22) formed therein; and pressurizing means (30, 32, 42) for pressurizing an operating fluid having been introduced into the operating fluid chamber (22). The operating fluid chamber (22) extends axially near the outer periphery of the shaft-like section (16) to the vicinity of the front end of the shaft-like section (16). The clamp body (12) has: an outer peripheral wall (24) defining the outer periphery of the operating fluid chamber (22); a front end wall (26) defining the axial front end of the operating fluid chamber (22); and a cantilever beam-like extension wall (28) extending from the front end wall (26) along a line extending axially from the outer peripheral wall (24), the extension wall (28) being configured so that, when the outer peripheral wall (24) is elastically deformed by the pressurization of the operating fluid, the elastic deformation of the outer peripheral wall (24) will cause the extension wall (28) to be displaced radially inward of the shaft-like section (16) with the front end wall (26) acting as the fulcrum point. The extension wall (28) clamps an object (Wa) to be clamped.

Description

流体圧式クランプ装置Hydraulic clamping device
 本発明は、流体圧式クランプ装置に関し、更に詳細には、小型部品のクランプに適した流体圧式クランプ装置に関する。 The present invention relates to a hydraulic clamping device, and more particularly to a hydraulic clamping device suitable for clamping small parts.
 研磨等に際して、光学用レンズをクランプする装置として、リセス皿の凹部に光学用レンズを接着剤によって貼り付け、凹部の内側から真空引きを行うことによって光学用レンズをリセス皿の基準面に密着されるものが知られている(例えば、特許文献1)。 As a device that clamps the optical lens during polishing, etc., the optical lens is adhered to the recess of the recess plate with an adhesive, and the optical lens is brought into close contact with the reference surface of the recess plate by vacuuming from the inside of the recess. Is known (for example, Patent Document 1).
 被クランプ物の内輪郭をクランプする装置として、コレットチャックの各アームの先端に外向きの爪が形成され、コレットチャックの内側に配置されたゴムスリーブを流体受容室の内圧を高めることによって膨張変形させ、この膨張変形によってコレットチャックが拡径することにより、爪によって被クランプ部の内輪郭をクランプするものが知られている(例えば、特許文献2)。 As a device to clamp the inner contour of the clamped object, an outward claw is formed at the tip of each arm of the collet chuck, and the rubber sleeve placed inside the collet chuck is expanded and deformed by increasing the internal pressure of the fluid receiving chamber In addition, there is known a technique in which the collet chuck is expanded in diameter by this expansion deformation, whereby the inner contour of the clamped portion is clamped by a claw (for example, Patent Document 2).
 流体圧式のクランプ装置として、軸状部に外周側を殻壁によって画定された作動流体室が形成され、作動流体室に充填された作動流体が加圧されることにより殻壁が拡径方向に膨張し、殻壁の外周に配置された被クランプ物の内輪郭をクランプするものが知られている(例えば、特許文献3)。 As a fluid pressure type clamping device, a working fluid chamber whose outer peripheral side is defined by a shell wall is formed in the shaft-like portion, and the working wall filled in the working fluid chamber is pressurized, so that the shell wall is expanded in the diameter direction. What expand | swells and clamps the inner outline of the to-be-clamped object arrange | positioned on the outer periphery of a shell wall is known (for example, patent document 3).
 他の流体圧式のクランプ装置として、筒状部に内周側を殻壁によって画定された作動流体室が形成され、作動流体室に充填された作動流体が加圧されることにより殻壁が縮径方向に膨張し、殻壁の内周に配置された被クランプ物の外輪郭をクランプするものが知られている(例えば、特許文献4)。 As another fluid pressure type clamping device, a working fluid chamber whose inner peripheral side is defined by a shell wall is formed in a cylindrical portion, and the working fluid filled in the working fluid chamber is pressurized to compress the shell wall. A device that expands in the radial direction and clamps the outer contour of an object to be clamped disposed on the inner periphery of the shell wall is known (for example, Patent Document 4).
特開2000-79547号公報JP 2000-79547 A 特開2002-36162号公報JP 2002-36162 A 特許第4344573号公報Japanese Patent No. 4344573 実公昭58-21605号公報Japanese Utility Model Publication No.58-21605
 特許文献1に示されているようなクランプ装置は、光学用レンズ等の小型部品のクランプを位置精度よくクランプするのに適しているが、接着剤の使用を伴うため、作業効率よく繰り返しのクランプ・アンクランプを行うことが難しい。 The clamp device as shown in Patent Document 1 is suitable for clamping a small component such as an optical lens with high positional accuracy. However, since it involves the use of an adhesive, it can be efficiently and repeatedly clamped.・ It is difficult to unclamp.
 特許文献2に示されているようなクランプ装置は、軸長が短い被クランプ物の内輪郭をクランプするのに適しているが、コレットチャックおよびコレットチャックを操作するゴムスリーブ等を含む機構が必要であるため、構造が複雑になる。 The clamp device as shown in Patent Document 2 is suitable for clamping the inner contour of a clamped object having a short axial length, but requires a mechanism including a collet chuck and a rubber sleeve for operating the collet chuck. Therefore, the structure becomes complicated.
 特許文献3に示されているようなクランプ装置は、比較的長い軸長を有する筒体の内輪郭をクランプするのに適しているが、軸長が短い被クランプ物の内輪郭をクランプすることに適していない。 The clamping device as shown in Patent Document 3 is suitable for clamping the inner contour of a cylinder having a relatively long axial length, but clamps the inner contour of a clamped object having a short axial length. Not suitable for.
 特許文献4に示されているようなクランプ装置は、比較的長い軸長を有する軸体の外輪郭をクランプするのに適しているが、軸長が短い被クランプ物の外輪郭をクランプすることに適していない。 A clamping device as shown in Patent Document 4 is suitable for clamping an outer contour of a shaft body having a relatively long axial length, but clamps an outer contour of a clamped object having a short axial length. Not suitable for.
 本発明が解決しようとする課題は、簡素な構造をもって軸長が短い被クランプ物のクランプも適切に行えるようにすることである。 The problem to be solved by the present invention is to enable proper clamping of a clamped object having a simple structure and a short axial length.
 本発明による流体圧式クランプ装置は、軸状部(16)を含み当該軸状部(16)に作動流体室(22、60)を形成されたクランプ本体(12)と、前記作動流体室(22、60)に充填された作動流体を加圧する加圧手段(30、32、42)とを有する流体圧式クランプ装置であって、前記作動流体室(22、60)は前記軸状部(16)の外周近傍において軸線方向に当該軸状部(16)の先端近傍まで延在しており、前記クランプ本体(12)は、前記作動流体室(22、60)の外周を画定する外周壁(24、52)および前記作動流体室(22、60)の軸線方向の先端を画定する先端壁(26、54)と、前記先端壁(26、54)より前記外周壁(24、52)の軸線方向の延長線上に延出し、前記作動流体の加圧による前記外周壁(24、52)の弾性変形によって前記先端壁(26、54)を支点として前記軸状部(16)の径方向内方に変位する片持ち梁状の延出壁(28、56)とを有し、前記延出壁(28、56)によって被クランプ物(Wa、Wb)のクランプを行う。 The hydraulic clamping device according to the present invention includes a clamp body (12) including a shaft portion (16) and a working fluid chamber (22, 60) formed in the shaft portion (16), and the working fluid chamber (22). , 60) and a pressurizing means (30, 32, 42) for pressurizing the working fluid filled therein, wherein the working fluid chamber (22, 60) has the shaft-like portion (16). The clamp body (12) extends in the axial direction in the vicinity of the outer periphery of the shaft-like portion (16), and the clamp body (12) has an outer peripheral wall (24) that defines the outer periphery of the working fluid chamber (22, 60). 52) and a tip wall (26, 54) defining the tip in the axial direction of the working fluid chamber (22, 60), and the axial direction of the outer peripheral wall (24, 52) from the tip wall (26, 54) By extending the working fluid and pressurizing the working fluid. Cantilever-like extended walls (28, 56) that are displaced radially inward of the shaft-like portion (16) with the distal end walls (26, 54) as fulcrums by elastic deformation of the outer peripheral walls (24, 52). The object to be clamped (Wa, Wb) is clamped by the extending walls (28, 56).
 この構成によれば、作動流体の加圧による作動流体室(22、60)の外周壁(24、52)の弾性変形によって延出壁(28、56)が軸状部(16)の径方向に変位することにより、延出壁(28、56)によって被クランプ物(Wa、Wb)のクランプを行うから、簡素な構造をもって被クランプ物(Wa、Wb)をクランプすることができる。延出壁(28、56)は、先端壁(26、54)を支点として軸状部(16)の径方向内方に変位する片持ち梁状であるから、軸長が短い被クランプ物(Wa、Wb)も適切にクランプすることができる。 According to this configuration, the extending wall (28, 56) is in the radial direction of the shaft-like portion (16) due to elastic deformation of the outer peripheral wall (24, 52) of the working fluid chamber (22, 60) due to pressurization of the working fluid. Since the object to be clamped (Wa, Wb) is clamped by the extending walls (28, 56) by displacing to (3), the object to be clamped (Wa, Wb) can be clamped with a simple structure. Since the extending walls (28, 56) are cantilevered and displaced inward in the radial direction of the shaft-like portion (16) with the tip walls (26, 54) as fulcrums, Wa, Wb) can also be clamped appropriately.
 本発明による流体圧式クランプ装置は、筒状部(77)を含み当該筒状部(77)に作動流体室(82、118)を形成されたクランプ本体(72、112)と、前記作動流体室(82、118)に充填された作動流体を加圧する加圧手段(90、92、102、126、128、134)とを有する流体圧式クランプ装置であって、前記作動流体室(82、118)は前記筒状部(77)の内周近傍において軸線方向に当該筒状部(77)の先端近傍まで延在しており、前記クランプ本体は、前記作動流体室の内周を画定する内周壁(84、120)および前記作動流体室(82、118)の軸線方向の先端を画定する先端壁(86、122)と、前記先端壁(86、122)より前記内周壁(84、120)の軸線方向の延長線上に延出し、前記作動流体の加圧による前記内周壁(84、120)の弾性変形によって前記先端壁(86、122)を支点して前記筒状部(77)の径方向外方に変位する片持ち梁状の延出壁(88、124)とを有し、前記延出壁(88、124)によって被クランプ物(Wc、Wd、We)のクランプを行う。 The hydraulic clamping device according to the present invention includes a clamp body (72, 112) including a cylindrical portion (77) and a working fluid chamber (82, 118) formed in the cylindrical portion (77), and the working fluid chamber. A hydraulic clamping device having pressurizing means (90, 92, 102, 126, 128, 134) for pressurizing the working fluid filled in (82, 118), wherein the working fluid chamber (82, 118) Extends in the axial direction in the vicinity of the inner periphery of the cylindrical portion (77) to the vicinity of the tip of the cylindrical portion (77), and the clamp body has an inner peripheral wall that defines the inner periphery of the working fluid chamber (84, 120) and a tip wall (86, 122) defining an axial tip of the working fluid chamber (82, 118), and the inner peripheral wall (84, 120) from the tip wall (86, 122). Extends along the axial extension The cantilever that is displaced radially outwardly of the tubular portion (77) with the tip wall (86, 122) as a fulcrum by elastic deformation of the inner peripheral wall (84, 120) due to the pressurization of the working fluid. It has a beam-like extending wall (88, 124), and the object to be clamped (Wc, Wd, We) is clamped by the extending wall (88, 124).
 この構成によれば、作動流体の加圧による作動流体室(82、118)の内周壁(84、120)の弾性変形によって延出壁(88、124)が筒状部(77)の径方向に変位することにより、延出壁(88、124)によって被クランプ物(Wc、Wd、We)のクランプを行うから、簡素な構造をもって被クランプ物(Wc、Wd、We)をクランプすることができる。延出壁(88、124)は、先端壁(86、122)を支点として筒状部(77)の径方向外方に変位する片持ち梁状であるから、軸長が短い被クランプ物(Wc、Wd、We)も適切にクランプすることができる。 According to this configuration, the extending wall (88, 124) is in the radial direction of the cylindrical portion (77) by elastic deformation of the inner peripheral wall (84, 120) of the working fluid chamber (82, 118) due to pressurization of the working fluid. The object to be clamped (Wc, Wd, We) is clamped by the extension walls (88, 124) by displacing the object to be clamped, so that the object to be clamped (Wc, Wd, We) can be clamped with a simple structure. it can. The extending walls (88, 124) are cantilevered, which are displaced outwardly in the radial direction of the cylindrical portion (77) with the tip walls (86, 122) as fulcrums. Wc, Wd, We) can also be clamped appropriately.
 本発明による流体圧式クランプ装置は、好ましくは、前記外周壁(24、52)あるいは前記内周壁(84、120)と前記先端壁(26、54、86、122)と前記延出壁(28、56、88、124)とが前記軸状部(16)あるいは前記筒状部(77)の大部分を構成する主部材(18、78、114)とは別部材(20、50、80、116)によって互いに一体に構成されている。 The hydraulic clamping device according to the present invention is preferably configured such that the outer peripheral wall (24, 52) or the inner peripheral wall (84, 120), the tip wall (26, 54, 86, 122) and the extension wall (28, 56, 88, 124) are separate members (20, 50, 80, 116) from the main members (18, 78, 114) that constitute most of the shaft-like portion (16) or the tubular portion (77). ) Are integrated with each other.
 この構成によれば、主部材(18、78、114)と別部材(20、50、80、116)とによって作動流体室(22、60、82、118)を簡単に画定でき、外周壁(24、52)あるいは内周壁(84、120)と先端壁(26、54、86、122)と延出壁(28、56、88、124)とが別部材(20、50、80、116)によって互いに一体に構成されていることにより、外周壁(24、52)あるいは内周壁(84、120)の弾性変形によって先端壁(26、54、86、122)が、先端壁(26、54、86、122)を支点として、軸状部(16)の径方向内方あるいは筒状部(77)の径方向外方に変位することが確実に行われる。 According to this configuration, the working fluid chamber (22, 60, 82, 118) can be easily defined by the main member (18, 78, 114) and the separate member (20, 50, 80, 116). 24, 52) or the inner peripheral wall (84, 120), the tip wall (26, 54, 86, 122) and the extending wall (28, 56, 88, 124) are separate members (20, 50, 80, 116). By the elastic deformation of the outer peripheral wall (24, 52) or the inner peripheral wall (84, 120), the tip wall (26, 54, 86, 122) becomes the tip wall (26, 54, 122). 86, 122) is reliably displaced radially inward of the shaft-like portion (16) or radially outward of the tubular portion (77).
 本発明による流体圧式クランプ装置は、好ましくは、前記先端壁(26、54、86、122)は、前記軸状部(16)あるいは前記筒状部(77)の軸線方向に直交する方向に延在して前記被クランプ物(Wa、Wb、Wc、Wd、We)の軸線方向の位置決めを行う先端面(26A、86A、122A)を有している。 In the hydraulic clamping device according to the present invention, preferably, the distal end wall (26, 54, 86, 122) extends in a direction perpendicular to the axial direction of the axial portion (16) or the cylindrical portion (77). And a distal end surface (26A, 86A, 122A) for positioning the object to be clamped (Wa, Wb, Wc, Wd, We) in the axial direction.
 この構成によれば、追加の構造を必要とすることなく、被クランプ物(Wa、Wb、Wc、We)の軸線方向の位置決めが行われる。 According to this configuration, the object to be clamped (Wa, Wb, Wc, We) is positioned in the axial direction without requiring an additional structure.
 本発明による流体圧式クランプ装置は、好ましくは、前記外周壁(24)あるいは前記内周壁(84、120)と前記延出壁(28、88、124)とが同一横断面の円環状である。 In the fluid pressure type clamping apparatus according to the present invention, preferably, the outer peripheral wall (24) or the inner peripheral wall (84, 120) and the extending wall (28, 88, 124) have an annular shape with the same cross section.
 この構成によれば、横断面形状が円形あるいは円環形の被クランプ物(Wa、Wc、We)のクランプを適切に行うことができる。 According to this configuration, it is possible to appropriately clamp a clamped object (Wa, Wc, We) having a circular or annular cross-sectional shape.
 本発明による流体圧式クランプ装置は、好ましくは、前記外周壁(52)あるいは前記内周壁(84)と前記延出壁(56、88)とが同一横断面の多角環状である。 In the fluid pressure type clamping apparatus according to the present invention, the outer peripheral wall (52) or the inner peripheral wall (84) and the extending wall (56, 88) are preferably polygonal rings having the same cross section.
 この構成によれば、横断面形状が多角形の被クランプ物(Wb、Wd)のクランプを適切に行うことができる。 According to this configuration, it is possible to appropriately clamp the clamped object (Wb, Wd) having a polygonal cross-sectional shape.
 本発明による流体圧式クランプ装置は、好ましくは、前記軸状部(16)あるいは前記筒状部(77)が多角形状であり、前記作動流体室(60、82)と前記外周壁(52)あるいは前記内周壁(84)と前記延出壁(56、88)とが多角形状の各辺に対応して個別に形成されている。 In the fluid pressure type clamping device according to the present invention, preferably, the shaft portion (16) or the cylindrical portion (77) has a polygonal shape, and the working fluid chamber (60, 82) and the outer peripheral wall (52) or The inner peripheral wall (84) and the extending wall (56, 88) are individually formed corresponding to each side of the polygonal shape.
 この構成によれば、横断面形状が多角形の被クランプ物(Wb、Wd)のクランプを適切に行うことができる。 According to this configuration, it is possible to appropriately clamp the clamped object (Wb, Wd) having a polygonal cross-sectional shape.
 本発明による流体圧式クランプ装置は、好ましくは、前記先端壁(26、86)に当該先端壁(26、86)の肉厚を薄くする凹部(27、87)が形成されている。 In the fluid pressure type clamping device according to the present invention, preferably, the tip wall (26, 86) is formed with a recess (27, 87) for reducing the thickness of the tip wall (26, 86).
 この構成によれば、先端壁(26、86)を支点とした延出壁(28、88)が軸状部(16)あるいは筒状部(77)の径方向に変位し易くなる。 According to this configuration, the extending wall (28, 88) with the tip wall (26, 86) as a fulcrum is easily displaced in the radial direction of the axial portion (16) or the cylindrical portion (77).
 本発明による流体圧式クランプ装置によれば、作動流体の加圧による作動流体室の外周壁あるいは内周壁の弾性変形によって延出壁が軸状部あるいは筒状部の径方向に変位することにより、延出壁によって被クランプ物のクランプを行うから、簡素な構造をもって被クランプ物をクランプすることができ、しかも延出壁は、先端壁を支点として軸状部は筒状部の径方向に変位する片持ち梁状であるから、軸長が短い被クランプ物も適切にクランプすることができる。 According to the fluid pressure type clamping device according to the present invention, the extending wall is displaced in the radial direction of the axial portion or the cylindrical portion by elastic deformation of the outer peripheral wall or the inner peripheral wall of the working fluid chamber by pressurization of the working fluid. Since the clamped object is clamped by the extension wall, the clamped object can be clamped with a simple structure, and the extension wall is displaced in the radial direction of the cylindrical part with the tip wall as a fulcrum. Therefore, the clamped object having a short axial length can be appropriately clamped.
本発明による流体圧式クランプ装置の実施形態1を示す斜視図The perspective view which shows Embodiment 1 of the hydraulic clamp apparatus by this invention 実施形態1による流体圧式クランプ装置の断面図(図1の線II-IIに沿った断面図相当)Sectional view of the hydraulic clamping device according to Embodiment 1 (equivalent to the sectional view along the line II-II in FIG. 1) 実施形態1による流体圧式クランプ装置の要部の拡大断面図The expanded sectional view of the principal part of the fluid pressure type clamp device by Embodiment 1 実施形態1による流体圧式クランプ装置の作動原理を示す説明図Explanatory drawing which shows the principle of operation of the fluid pressure type clamp device by Embodiment 1. 実施形態1による流体圧式クランプ装置の変形例を示す要部の拡大断面図The expanded sectional view of the principal part which shows the modification of the hydraulic clamp apparatus by Embodiment 1 本発明による流体圧式クランプ装置の実施形態2を示す斜視図The perspective view which shows Embodiment 2 of the hydraulic clamp apparatus by this invention 実施形態1による流体圧式クランプ装置の拡大断面図(図6の線VII-VIIに沿った断面図相当)FIG. 6 is an enlarged sectional view of the hydraulic clamping device according to the first embodiment (corresponding to a sectional view taken along line VII-VII in FIG. 6). 本発明による流体圧式クランプ装置の実施形態3を示す斜視図The perspective view which shows Embodiment 3 of the hydraulic-type clamp apparatus by this invention. 実施形態3による流体圧式クランプ装置の断面図(図8の線IX-IXに沿った断面図相当)Sectional view of hydraulic clamping device according to Embodiment 3 (equivalent to a sectional view along line IX-IX in FIG. 8) 実施形態3による流体圧式クランプ装置の要部の拡大断面図The expanded sectional view of the principal part of the fluid pressure type clamp device by Embodiment 3 実施形態3による流体圧式クランプ装置の作動原理を示す説明図Explanatory drawing which shows the working principle of the fluid pressure type clamp apparatus by Embodiment 3. 実施形態3による流体圧式クランプ装置の変形例を示す要部の拡大断面図The expanded sectional view of the principal part which shows the modification of the hydraulic clamp apparatus by Embodiment 3 本発明による流体圧式クランプ装置の実施形態4を示す斜視図The perspective view which shows Embodiment 4 of the hydraulic-type clamp apparatus by this invention. 本発明による流体圧式クランプ装置の実施形態5を示す拡大縦断面図The expanded longitudinal cross-sectional view which shows Embodiment 5 of the hydraulic-type clamp apparatus by this invention 図14の線XV-XVに沿った断面図Sectional view along line XV-XV in FIG. 本発明による流体圧式クランプ装置の他の実施形態を示す要部の拡大断面図The expanded sectional view of the principal part which shows other embodiment of the hydraulic clamp apparatus by this invention 本発明による流体圧式クランプ装置の他の実施形態を示す要部の拡大断面図The expanded sectional view of the principal part which shows other embodiment of the hydraulic clamp apparatus by this invention
 本発明による流体圧式クランプ装置の実施形態1を、図1~図3を参照して説明する。 Embodiment 1 of a fluid pressure type clamping apparatus according to the present invention will be described with reference to FIGS.
 流体圧式クランプ装置10はクランプ本体12を有する。クランプ本体12は、円盤状の取付用フランジ部14および取付用フランジ部14から軸線方向の一方の側に延出した円形横断面の軸状部16の大部分を構成する主部材18と、主部材18の先端側の外周にろう付け等によって固定されたスリーブ部材20とを含む。主部材18およびスリーブ部材20はステンレス鋼等の金属材料あるいは硬質の合成樹脂、セラミック等によって構成されている。取付用フランジ部14と軸状部16とは互いに同心である。クランプ本体12は取付用フランジ部14によって工作機械の主軸等に取り付けられる。 The fluid pressure type clamp device 10 has a clamp body 12. The clamp body 12 includes a disk-shaped mounting flange portion 14, a main member 18 that constitutes a major portion of a circular cross-section shaft-shaped portion 16 extending from the mounting flange portion 14 to one side in the axial direction, And a sleeve member 20 fixed to the outer periphery of the member 18 on the front end side by brazing or the like. The main member 18 and the sleeve member 20 are made of a metal material such as stainless steel, hard synthetic resin, ceramic, or the like. The mounting flange portion 14 and the shaft-like portion 16 are concentric with each other. The clamp main body 12 is attached to a spindle of a machine tool or the like by an attachment flange portion 14.
 主部材18は、先端側に小径部18Aを有し、小径部18Aの部分にスリーブ部材20と協働して軸状部16の外周近傍を軸線方向に軸状部16の先端近傍まで延在した円環横断面形状の作動流体室22を構成している。 The main member 18 has a small-diameter portion 18A on the distal end side, and extends in the vicinity of the outer periphery of the shaft-shaped portion 16 in the axial direction to the vicinity of the distal end of the shaft-shaped portion 16 in cooperation with the sleeve member 20 at the small-diameter portion 18A. The working fluid chamber 22 having an annular cross-sectional shape is formed.
 スリーブ部材20は、主部材18の軸線方向に延在して作動流体室22の外周を画定する薄肉の円筒状の外周壁24と、外周壁24と直交する方向(主部材18の径方向)に延在して作動流体室22の軸線方向の先端を画定する内向きの円環フランジ状の先端壁26と、先端壁26より外周壁24の軸線方向(主部材18の軸線方向)の延長線上に延出した片持ち梁による円筒状の延出壁28とを一体に有する。なお、作動流体室22の軸線方向の先端は、軸状部16の軸線方向の先端(小径部18Aの側の先端)と同じ側の端部である。 The sleeve member 20 extends in the axial direction of the main member 18 to define a thin cylindrical outer peripheral wall 24 that defines the outer periphery of the working fluid chamber 22, and a direction orthogonal to the outer peripheral wall 24 (the radial direction of the main member 18). An inward annular flange-shaped tip wall 26 that defines a tip in the axial direction of the working fluid chamber 22 and an extension in the axial direction of the outer peripheral wall 24 (the axial direction of the main member 18) from the tip wall 26. A cylindrical extending wall 28 made of a cantilever beam extending on a line is integrally provided. The tip end in the axial direction of the working fluid chamber 22 is an end portion on the same side as the tip end in the axial direction of the shaft-like portion 16 (the tip on the small diameter portion 18A side).
 延出壁28は、外周壁24と同心で、軸線方向長さ(軸長)が外周壁24の軸線方向長さより短く、外周壁24の径方向の肉厚に略等しい径方向の肉厚を有し、外周壁24と同一横断面の円環状である。延出壁28は、円形横断面の被クランプ物Waの外輪郭形状と同じ円筒状をしており、内側に被クランプ物Waを受け入れ、被クランプ物Waの外周(全周)を囲繞する。延出壁28の内径は、自然状態で、被クランプ物Waの外径に等しいか、外径より僅かに大きい寸法に設定されている。 The extending wall 28 is concentric with the outer peripheral wall 24, has an axial length (axial length) shorter than the axial length of the outer peripheral wall 24, and has a radial thickness substantially equal to the radial thickness of the outer peripheral wall 24. And has an annular shape having the same cross section as that of the outer peripheral wall 24. The extending wall 28 has the same cylindrical shape as the outer contour shape of the clamped object Wa having a circular cross section, receives the clamped object Wa inside, and surrounds the outer periphery (entire circumference) of the clamped object Wa. The inner diameter of the extending wall 28 is set to a size that is equal to or slightly larger than the outer diameter of the workpiece Wa in a natural state.
 被クランプ物Waは光学レンズのような軸長が短いものであってよく、延出壁28の軸線方向の寸法(延出長)は被クランプ物Waの軸線方向の寸法より小さい。被クランプ物Waの端面を加工する場合には、延出壁28と被クランプ物Waとの軸線方向の寸法差は、少なくともその端面加工代より大きく、端面加工の工具が延出壁28と干渉しない値に設定されている。 The object to be clamped Wa may have a short axial length like an optical lens, and the axial dimension (extending length) of the extending wall 28 is smaller than the dimension of the clamped object Wa in the axial direction. When machining the end face of the workpiece Wa, the axial dimension difference between the extending wall 28 and the workpiece Wa is at least larger than the end machining allowance, and the end face machining tool interferes with the extending wall 28. It is set to a value that does not.
 先端壁26は、軸状部16の軸線方向に直交する方向、つまり外周壁24および延出壁28より軸状部16の径方向内方に延在して円環フランジ状をなし、主部材18の先端面18Bと面一の先端面26Aを有する。換言すると、先端壁26は、外周壁24と延出壁28との接続部をなしており、軸状部16の径方向に延在していることにより、外周壁24および延出壁28に比して径方向の肉厚が厚く、同方向には外周壁24および延出壁28に比して高い剛性を有して外周壁24と延出壁28との接続部を主部材18に対して剛固に固定する固定点をなしている。 The distal end wall 26 extends in the direction perpendicular to the axial direction of the shaft-shaped portion 16, that is, radially inward of the shaft-shaped portion 16 from the outer peripheral wall 24 and the extending wall 28 to form an annular flange shape. 18 tip surfaces 18B and the same tip surface 26A. In other words, the distal end wall 26 forms a connecting portion between the outer peripheral wall 24 and the extending wall 28, and extends in the radial direction of the shaft-shaped portion 16, thereby causing the outer peripheral wall 24 and the extending wall 28 to be connected to each other. Compared with the outer peripheral wall 24 and the extending wall 28 in the same direction, the thickness of the radial direction is thicker, and the connecting portion between the outer peripheral wall 24 and the extending wall 28 is connected to the main member 18. On the other hand, it has a fixed point that is fixed firmly.
 先端面18Bおよび26Aは、これらに当接するまで被クランプ物Waが延出壁28の内側に挿入されることにより、被クランプ物Waの軸線方向の位置決めを行うと共に、被クランプ物Waが倒れることを阻止する。これにより、被クランプ物Waは軸状部16に真直性をもって同心に配置される。 When the object to be clamped Wa is inserted into the extension wall 28 until the tip surfaces 18B and 26A come into contact with them, the object Wa to be clamped is positioned in the axial direction and the object to be clamped Wa falls down. To prevent. Thereby, the clamped object Wa is arranged concentrically with straightness on the shaft-like portion 16.
 クランプ本体12には軸状部16と同心にピストン室30が形成されている。ピストン室30の一端側にはピストン32が軸線方向に移動可能に嵌合している。ピストン室30の他端側はクランプ本体12に形成された連通孔34、36によって作動流体室22に連通している。作動流体室22とピストン室30と連通孔34、36とは一つの密閉空間を画成しており、当該密閉空間には、非圧縮性流体として作動油が充填封入されている。 A piston chamber 30 is formed in the clamp body 12 concentrically with the shaft-like portion 16. A piston 32 is fitted to one end side of the piston chamber 30 so as to be movable in the axial direction. The other end side of the piston chamber 30 communicates with the working fluid chamber 22 through communication holes 34 and 36 formed in the clamp body 12. The working fluid chamber 22, the piston chamber 30, and the communication holes 34 and 36 define one sealed space, and the sealed space is filled and filled with hydraulic oil as an incompressible fluid.
 取付用フランジ部14の軸状部16と反対の側には円柱状部38が取付用フランジ部14と同心に突出形成されている。円柱状部38にはピストン32の配置部に連通するねじ孔40がピストン室30の軸線方向の延長上に形成されている。ねじ孔40は円柱状部38の先端面(主部材18の先端面18Bとは反対側の先端面)に開口している。ねじ孔40には開口端の側から挿入された作動ねじ部材42の雄ねじ部44がねじ係合している。雄ねじ部44とピストン32との間には鋼球48が両者に挟まれるようにして配置されている。作動ねじ部材42はねじ孔40の開口端より外方に突出した六角柱部46を雄ねじ部44と一体に有する。このようにして作動流体室22の作動油を加圧する加圧手段がクランプ本体12に構成される。 A cylindrical portion 38 is formed on the opposite side of the mounting flange portion 14 from the shaft-shaped portion 16 so as to protrude concentrically with the mounting flange portion 14. The cylindrical portion 38 is formed with a screw hole 40 communicating with the arrangement portion of the piston 32 on the extension of the piston chamber 30 in the axial direction. The screw hole 40 opens at the distal end surface of the cylindrical portion 38 (the distal end surface opposite to the distal end surface 18B of the main member 18). A male screw portion 44 of an operating screw member 42 inserted from the open end side is screwed into the screw hole 40. A steel ball 48 is disposed between the male screw portion 44 and the piston 32 so as to be sandwiched between the both. The operating screw member 42 has a hexagonal column portion 46 that protrudes outward from the opening end of the screw hole 40, integrally with the male screw portion 44. In this way, the pressurizing means for pressurizing the working oil in the working fluid chamber 22 is configured in the clamp body 12.
 作動ねじ部材42は、六角柱部46に係合する六角スパナ等の工具によってねじ込み側に廻され、図2で見て右側に螺進すると、鋼球48を介してピストン32が右側に軸線方向移動し、作動流体室22、ピストン室30および連通孔34、36に密閉されている作動油の圧力が上昇する。作動油の圧力上昇によって外周壁24が軸状部16の拡径方向に膨らむように弾性変形する。 The operating screw member 42 is turned to the screwing side by a tool such as a hexagonal spanner that engages with the hexagonal column 46 and is screwed to the right side as viewed in FIG. It moves and the pressure of the hydraulic fluid sealed by the working fluid chamber 22, the piston chamber 30, and the communicating holes 34 and 36 rises. The outer peripheral wall 24 is elastically deformed so as to swell in the diameter-expanding direction of the shaft-like portion 16 due to the pressure increase of the hydraulic oil.
 外周壁24が拡径方向に膨らむように弾性変形すると、図4に示されているように、延出壁28が、外周壁24と延出壁28との連結体の主部材18に対する固定点をなす先端壁26を梃子の支点のようにして、軸状部16の径方向内方に変位する。この変位によって、延出壁28が被クランプ物Waの外輪郭に押し付けられ、被クランプ物Waのクランプが行われる。 When the outer peripheral wall 24 is elastically deformed so as to swell in the diameter increasing direction, as shown in FIG. 4, the extension wall 28 is fixed to the main member 18 of the coupling body of the outer peripheral wall 24 and the extension wall 28. The distal end wall 26 is formed as a fulcrum of the insulator and is displaced inward in the radial direction of the shaft-like portion 16. By this displacement, the extending wall 28 is pressed against the outer contour of the workpiece Wa and the workpiece Wa is clamped.
 これにより、片持ち梁状の延出壁28が、鉗子の先端で被クランプ物Waを掴むようにクランプするから、被クランプ物Waが光学レンズのように軸長が短いものであっても、確実にクランプすることができる。 As a result, the cantilever-shaped extending wall 28 clamps the clamped object Wa at the tip of the forceps, so even if the clamped object Wa has a short axial length like an optical lens, It can be clamped securely.
 延出壁28は、被クランプ物Waの外輪郭形状と同じ円筒状であって外周壁24と同一横断面の円環状であることにより、外周壁24の弾性変形によって周方向の全域に亘って一様に径方向内方に変位するから、延出壁28による被クランプ物Waの外輪郭のクランプが軸状部16に対して高い同心性をもって高精度に行われる。 The extending wall 28 has the same cylindrical shape as the outer contour shape of the object to be clamped Wa and has an annular shape having the same cross-section as the outer peripheral wall 24, so that the outer peripheral wall 24 is elastically deformed over the entire region in the circumferential direction. Since it is uniformly displaced radially inward, the outer wall of the object Wa to be clamped by the extending wall 28 is clamped with high concentricity and high accuracy with respect to the shaft-like portion 16.
 延出壁28の軸線方向の寸法が被クランプ物Waの軸線方向の寸法より小さく、延出壁28と被クランプ物Waとの軸線方向の寸法差が被クランプ物Waの端面加工代より大きく、当該寸法差を延出壁28の軸長設定によって端面加工の工具が延出壁28と干渉しない値に設定することができるから、流体圧式クランプ装置10によって外輪郭をクランプされている軸長が短い被クランプ物Waの端面加工を支障なく行うことができる。 The dimension in the axial direction of the extending wall 28 is smaller than the dimension in the axial direction of the object to be clamped Wa, and the dimension difference in the axial direction between the extending wall 28 and the object to be clamped Wa is larger than the machining end face of the object to be clamped Wa. Since the dimensional difference can be set to a value at which the end face machining tool does not interfere with the extending wall 28 by setting the axial length of the extending wall 28, the axial length with which the outer contour is clamped by the hydraulic clamping device 10 is determined. The end surface processing of the short workpiece Wa can be performed without hindrance.
 また、被クランプ物Waが先端面18Bおよび26Aに当接するまで延出壁28の内側に挿入されることにより、被クランプ物Waの軸線方向の位置決めが行われると共に、被クランプ物Waが倒れることを阻止される。これにより、被クランプ物Waは軸状部16に対して高い真直性をもって同心にクランプされる。 Further, the object to be clamped Wa is inserted into the extension wall 28 until it comes into contact with the front end surfaces 18B and 26A, whereby the object to be clamped Wa is positioned in the axial direction and the object to be clamped Wa falls down. Is prevented. Thereby, the workpiece Wa is clamped concentrically with high straightness with respect to the shaft-like portion 16.
 作動ねじ部材42が弛み側に廻され、図2で見て左側に螺進すると、作動油の圧力によって押されるようにしてピストン32が左側に軸線方向移動し、作動流体室22、ピストン室30および連通孔34、36に密閉されている作動油の圧力が降下する。作動油の圧力がもとの状態(略大気圧)に戻ると、外周壁24の弾性変形がなくなり、延出壁28が元の状態に戻る。 When the operating screw member 42 is turned to the slack side and screwed to the left as viewed in FIG. 2, the piston 32 moves in the axial direction to the left so as to be pushed by the pressure of the operating oil, and the working fluid chamber 22 and the piston chamber 30 are moved. And the pressure of the hydraulic fluid sealed by the communicating holes 34 and 36 falls. When the pressure of the hydraulic oil returns to the original state (substantially atmospheric pressure), the outer peripheral wall 24 is not elastically deformed, and the extending wall 28 returns to the original state.
 延出壁28が元の状態に戻ると、延出壁28が被クランプ物Waの外輪郭に押し付けられることが解除され、被クランプ物Waのクランプが解除される。 When the extending wall 28 returns to the original state, the pressing of the extending wall 28 against the outer contour of the workpiece Wa is released, and the clamping of the workpiece Wa is released.
 上述の如く、流体圧式クランプ装置10は、多くの構成部品を必要とすることなく、簡素な構造をもって軸長が短い被クランプ物Waを適切にクランプおよびアンクランプすることができる。 As described above, the hydraulic clamping device 10 can appropriately clamp and unclamp the clamped object Wa having a short shaft length with a simple structure without requiring many components.
 実施形態1の変形実施形態として、図5に示されているように、先端壁26と外周壁24とを接続する隅角部および先端壁26と延出壁28とを接続する隅角部に、先端壁26の肉厚を薄くする円環状の凹部27が形成されていてもよい。 As a modified embodiment of the first embodiment, as shown in FIG. 5, the corner portion connecting the tip wall 26 and the outer peripheral wall 24 and the corner portion connecting the tip wall 26 and the extension wall 28 are used. An annular recess 27 that reduces the thickness of the tip wall 26 may be formed.
 凹部27が設けられていると、延出壁28が先端壁26を梃子の支点のようにして軸状部16の径方向内方に変位することが容易になり、作動流体室22の内圧上昇が少なくても、延出壁28による被クランプ物Waのクランプが所要のクランプ力をもって行われるようになる。 If the concave portion 27 is provided, it becomes easy for the extending wall 28 to displace the tip wall 26 radially inward of the shaft-like portion 16 like the fulcrum of the insulator, and the internal pressure of the working fluid chamber 22 increases. Even if there is little, clamping of the to-be-clamped object Wa by the extension wall 28 will be performed with a required clamping force.
 つぎに、本発明による流体圧式クランプ装置の実施形態2を、図6および図7を参照して説明する。なお、図6および図7において、図1~図3に対応する部分は、図1~図3に付した符号と同一の符号を付けて、その説明を省略する。 Next, a second embodiment of the fluid pressure type clamping apparatus according to the present invention will be described with reference to FIG. 6 and FIG. 6 and 7, parts corresponding to those in FIGS. 1 to 3 are given the same reference numerals as those in FIGS. 1 to 3, and description thereof is omitted.
 実施形態2の流体圧式クランプ装置10は、バイトチップのような軸長が短い三角形状の被クランプ物Wbをクランプ対象としたものであり、主部材18の先端側が三角形状横断面による三角柱部18Cになっている。 The fluid pressure type clamping device 10 of the second embodiment is intended for clamping a triangular object Wb having a short axial length such as a bite tip, and the tip side of the main member 18 is a triangular prism portion 18C having a triangular cross section. It has become.
 三角柱部18Cの辺毎の矩形の平面部には平面形状が矩形の浅底の凹部18Dが形成されている。三角柱部18Cの辺毎の平面部には板状部材50がろう付け等によって固定されている。 A shallow concave portion 18D having a rectangular planar shape is formed in a rectangular flat portion for each side of the triangular prism portion 18C. A plate-like member 50 is fixed to a flat portion for each side of the triangular prism portion 18C by brazing or the like.
 3個の板状部材50は、各々、凹部18Dの開口を塞いで作動流体室60の外周を画定する矩形平板状の外周壁(外壁)52と、外周壁52と直交する方向(主部材18の径方向)に延在して作動流体室22の軸線方向の先端を画定する矩形片状の先端壁54と、先端壁54より外周壁52の軸線方向(主部材18の軸線方向)の延長線上に延出した片持ち梁による矩形片状の延出壁56とを一体に有する。このようにして、作動流体室60および外周壁52と延出壁56とが三角形状の各辺に対応して個別に形成される。なお、この実施形態でも、作動流体室60の軸線方向の先端は、軸状部16の軸線方向の先端(三角柱部18Cの側の先端)と同じ側の端部である。 The three plate-like members 50 each have a rectangular flat plate-like outer peripheral wall (outer wall) 52 that blocks the opening of the recess 18D and defines the outer periphery of the working fluid chamber 60, and a direction (main member 18) perpendicular to the outer peripheral wall 52. A rectangular piece-like tip wall 54 that defines the tip of the working fluid chamber 22 in the axial direction, and an extension of the outer peripheral wall 52 in the axial direction (axis direction of the main member 18) from the tip wall 54. A rectangular piece-like extension wall 56 is integrally formed by a cantilever beam extending on the line. In this manner, the working fluid chamber 60, the outer peripheral wall 52, and the extending wall 56 are individually formed corresponding to each triangular side. Also in this embodiment, the tip in the axial direction of the working fluid chamber 60 is the end on the same side as the tip in the axial direction of the shaft-like portion 16 (tip on the side of the triangular prism portion 18C).
 3個の延出壁56は、軸線方向長さ(軸長)が外周壁52の軸線方向長さより短く、外周壁52の板厚に略等しい板厚を有し、互いに協働して正面視で被クランプ物Wbの外輪郭形状と同等の三角形状をなし、内側に被クランプ物Wbを受け入れ、被クランプ物Wbの各辺に接合する。3個の延出壁56による三角形状は、自然状態で、被クランプ物Wbの外郭寸法に等しいか、外郭寸法より僅かに大きい寸法に設定されている。 The three extending walls 56 have a length in the axial direction (axial length) shorter than the length in the axial direction of the outer peripheral wall 52 and have a plate thickness substantially equal to the plate thickness of the outer peripheral wall 52. Thus, a triangular shape equivalent to the outer contour shape of the clamped object Wb is formed, and the clamped object Wb is received inside and joined to each side of the clamped object Wb. The triangular shape formed by the three extending walls 56 is set to a dimension that is equal to or slightly larger than the outer dimension of the clamped object Wb in a natural state.
 延出壁56の軸線方向の寸法(延出長)は被クランプ物Wbの軸線方向の寸法より小さい。被クランプ物Wbの端面を加工する場合には、延出壁56と被クランプ物Wbとの軸線方向の寸法差は、少なくともその端面加工代より大きく、端面加工の工具が延出壁56と干渉しない値に設定されている。 The dimension (extension length) in the axial direction of the extending wall 56 is smaller than the dimension in the axial direction of the clamped object Wb. When machining the end face of the workpiece Wb, the axial dimension difference between the extension wall 56 and the workpiece Wb is at least larger than the machining allowance of the end face, and the end face machining tool interferes with the extension wall 56. It is set to a value that does not.
 3個の作動流体室60は連通孔34、36によってピストン室30に連通している。ピストン室30を含んで作動流体室60の作動油を加圧する加圧手段は、実施形態1と同様にクランプ本体12に構成されている。 The three working fluid chambers 60 communicate with the piston chamber 30 through the communication holes 34 and 36. The pressurizing means that pressurizes the hydraulic fluid in the working fluid chamber 60 including the piston chamber 30 is configured in the clamp body 12 as in the first embodiment.
 作動ねじ部材42のねじ込みによって作動流体室60の作動油の圧力が上昇すると、各外周壁52が軸状部16の拡径方向に膨らむように弾性変形する。外周壁52が拡径方向に膨らむように弾性変形すると、実施形態1と同様に、図4に示されているように、各延出壁56が、外周壁52と延出壁56との連結体の主部材18に対する固定点をなす先端壁54を梃子の支点のようにして、軸状部16の径方向内方に変位する。この変位によって、各延出壁56が被クランプ物Wbの外輪郭に押し付けられ、被クランプ物Wbのクランプが行われる。 When the pressure of the working oil in the working fluid chamber 60 rises due to the screwing of the working screw member 42, each outer peripheral wall 52 is elastically deformed so as to swell in the diameter increasing direction of the shaft-like portion 16. When the outer peripheral wall 52 is elastically deformed so as to swell in the diameter increasing direction, each extended wall 56 is connected to the outer peripheral wall 52 and the extended wall 56 as shown in FIG. The distal end wall 54 that forms a fixed point with respect to the main member 18 of the body is displaced radially inward of the shaft-like portion 16 like a fulcrum of the insulator. By this displacement, each extending wall 56 is pressed against the outer contour of the clamped object Wb, and the clamped object Wb is clamped.
 これにより、片持ち梁状の延出壁56が、鉗子の先端で被クランプ物Wbを掴むようにクランプするから、被クランプ物Wbが光学レンズのように軸長が短いものであっても、確実にクランプすることができる。 As a result, the cantilevered extending wall 56 clamps the object to be clamped Wb at the tip of the forceps so that the object to be clamped Wb has a short axial length like an optical lens. It can be clamped securely.
 3個の板状部材50および作動流体室60が同じ構造であることにより、3個の延出壁56は、互いに一様に径方向内方に変位するから、延出壁56による被クランプ物Wbの外輪郭のクランプが軸状部16に対して高い同心性をもって高精度に行われる。 Since the three plate-like members 50 and the working fluid chamber 60 have the same structure, the three extending walls 56 are uniformly displaced radially inward from each other. Clamping of the outer contour of Wb is performed with high concentricity and high accuracy with respect to the shaft-like portion 16.
 延出壁56の軸線方向の寸法が被クランプ物Wbの軸線方向の寸法より小さく、延出壁56と被クランプ物Wbとの軸線方向の寸法差が被クランプ物Wbの端面加工代より大きく、当該寸法差を延出壁56の軸長設定によって端面加工の工具が延出壁56と干渉しない値に設定することができるから、実施形態1と同様に流体圧式クランプ装置10によって外輪郭をクランプされている軸長が短い被クランプ物Wbの端面加工を支障なく行うことができる。 The axial dimension of the extending wall 56 is smaller than the axial dimension of the clamped object Wb, and the axial dimension difference between the extending wall 56 and the clamped object Wb is larger than the end face machining allowance of the clamped object Wb. Since the dimensional difference can be set to a value at which the end face machining tool does not interfere with the extending wall 56 by setting the axial length of the extending wall 56, the outer contour is clamped by the hydraulic clamping device 10 as in the first embodiment. The end face machining of the clamped object Wb having a short axial length can be performed without hindrance.
 また、被クランプ物Wbが先端壁54の先端面および三角柱部18Cの先端面に当接するまで延出壁56の内側に挿入されることにより、被クランプ物Wbの軸線方向の位置決めが行われると共に、被クランプ物Wbが倒れることを阻止される。これにより、被クランプ物Wbは軸状部16に対して高い真直性をもって同心にクランプされる。 Further, the object to be clamped Wb is inserted inside the extending wall 56 until it comes into contact with the tip surface of the tip wall 54 and the tip surface of the triangular prism portion 18C, whereby the object to be clamped Wb is positioned in the axial direction. The to-be-clamped object Wb is prevented from falling down. Thereby, the workpiece Wb is clamped concentrically with high straightness with respect to the shaft-like portion 16.
 作動ねじ部材42が弛み側に廻されると、作動流体室60の作動油の圧力が降下し、作動油の圧力がもとの状態(略大気圧)に戻ると、外周壁52の弾性変形がなくなり、延出壁56が元の状態に戻る。延出壁56が元の状態に戻ると、延出壁56が被クランプ物Wbの外輪郭に押し付けられることが解除され、被クランプ物Wbのクランプが解除される。 When the working screw member 42 is turned to the slack side, the pressure of the working oil in the working fluid chamber 60 decreases. When the pressure of the working oil returns to the original state (substantially atmospheric pressure), the elastic deformation of the outer peripheral wall 52 occurs. The extended wall 56 returns to its original state. When the extension wall 56 returns to the original state, the extension wall 56 is released from being pressed against the outer contour of the clamped object Wb, and the clamp of the clamped object Wb is released.
 このように、実施形態2の流体圧式クランプ装置10も、実施形態1と同様に、多くの構成部品を必要とすることなく、簡素な構造をもって軸長が短い被クランプ物Wbを適切にクランプおよびアンクランプすることができる。 As described above, the hydraulic clamping device 10 according to the second embodiment can appropriately clamp and clamp the workpiece Wb having a simple structure and a short axial length without requiring many components as in the first embodiment. Can be unclamped.
 本発明による流体圧式クランプ装置の実施形態3を、図8~図10を参照して説明する。 Embodiment 3 of the hydraulic clamping device according to the present invention will be described with reference to FIGS.
 流体圧式クランプ装置70はクランプ本体72を有する。クランプ本体72は、円盤状の取付用フランジ部74および取付用フランジ部74から軸線方向の一方の側に延出した円形横断面の軸状部76の大部分を構成する主部材78と、軸状部76の先端側に形成された円環横断面形状の筒状部77の内周にろう付け等によって固定された薄肉のスリーブ部材80とを含む。主部材78およびスリーブ部材80はステンレス鋼等の金属材料あるいは硬質の合成樹脂、セラミック等によって構成されている。取付用フランジ部74と軸状部76と筒状部77とは互いに同心である。クランプ本体72は取付用フランジ部74によって工作機械の主軸等に取り付けられる。 The fluid pressure type clamp device 70 has a clamp body 72. The clamp main body 72 includes a disk-shaped mounting flange portion 74 and a main member 78 constituting most of a circular cross-section shaft-shaped portion 76 extending from the mounting flange portion 74 to one side in the axial direction, and a shaft And a thin sleeve member 80 fixed to the inner periphery of a cylindrical portion 77 having an annular cross-sectional shape formed on the distal end side of the shape portion 76 by brazing or the like. The main member 78 and the sleeve member 80 are made of a metal material such as stainless steel, hard synthetic resin, ceramic, or the like. The mounting flange portion 74, the shaft portion 76, and the cylindrical portion 77 are concentric with each other. The clamp main body 72 is attached to the spindle of the machine tool or the like by an attachment flange portion 74.
 筒状部77はスリーブ部材80と協働して内周近傍を軸線方向に筒状部77の先端近傍まで延在した円環横断面形状の作動流体室82を構成している。 The cylindrical part 77 constitutes a working fluid chamber 82 having an annular cross section extending in the axial direction to the vicinity of the tip of the cylindrical part 77 in cooperation with the sleeve member 80 in the axial direction.
 スリーブ部材80は、主部材78の軸線方向に延在して作動流体室82の内周を画定する円筒状の内周壁84と、内周壁84と直交する方向(主部材78の径方向)に延在して作動流体室82の軸線方向の先端を画定する外向きの円環フランジ状の先端壁86と、先端壁86より内周壁84の軸線方向(主部材78の軸線方向)の延長線上に延出した片持ち梁による円筒状の延出壁88とを一体に有する。なお、作動流体室82の軸線方向の先端は、軸状部76の軸線方向の先端(筒状部77の側の先端)と同じ側の端部である。 The sleeve member 80 extends in the axial direction of the main member 78 and defines a cylindrical inner peripheral wall 84 that defines the inner periphery of the working fluid chamber 82, and a direction orthogonal to the inner peripheral wall 84 (the radial direction of the main member 78). An outwardly extending annular flange-like tip wall 86 that extends to define the tip of the working fluid chamber 82 in the axial direction, and an extension line in the axial direction of the inner peripheral wall 84 (the axial direction of the main member 78) from the tip wall 86 And a cylindrical extending wall 88 formed of a cantilever beam extending in a single-piece manner. The tip end in the axial direction of the working fluid chamber 82 is an end portion on the same side as the tip end in the axial direction of the shaft-like portion 76 (tip on the cylindrical portion 77 side).
 延出壁88は、内周壁84と同心で、軸線方向長さ(軸長)が内周壁84の軸線方向長さより短く、内周壁84の径方向の肉厚に略等しい径方向の肉厚を有し、内周壁84と同一横断面の円環状である。延出壁88は、円環状の被クランプ物Wcの内輪郭形状と同じ円筒状をしており、外側に被クランプ物Wcを受け入れ、被クランプ物Wcの内周(全周)を囲繞する。延出壁88の外径は、自然状態で、被クランプ物Wcの内径に等しいか、内径より僅かに小さい寸法に設定されている。 The extension wall 88 is concentric with the inner peripheral wall 84, has an axial length (axis length) shorter than the axial length of the inner peripheral wall 84, and has a radial thickness substantially equal to the radial thickness of the inner peripheral wall 84. And has an annular shape having the same cross section as the inner peripheral wall 84. The extension wall 88 has the same cylindrical shape as the inner contour shape of the annular clamped object Wc, receives the clamped object Wc on the outside, and surrounds the inner periphery (entire circumference) of the clamped object Wc. The outer diameter of the extending wall 88 is set to a dimension that is equal to or slightly smaller than the inner diameter of the clamped object Wc in a natural state.
 被クランプ物Wcは軸長が短いものであり、延出壁88の軸線方向の寸法(延出長)は被クランプ物Wcの軸線方向の寸法より小さい。被クランプ物Wcの端面を加工する場合には、延出壁88と被クランプ物Wcとの軸線方向の寸法差は、少なくともその端面加工代より大きく、端面加工の工具が延出壁88と干渉しない値に設定されている。 The object to be clamped Wc has a short axial length, and the dimension of the extending wall 88 in the axial direction (extended length) is smaller than the dimension of the object to be clamped Wc in the axial direction. When machining the end face of the workpiece Wc, the axial dimension difference between the extending wall 88 and the workpiece Wc is at least larger than the end face machining allowance, and the end face machining tool interferes with the extending wall 88. It is set to a value that does not.
 先端壁86は、軸状部76の軸線方向に直交する方向、つまり内周壁84および延出壁88より軸状部76の径方向外方に延在して円環フランジ状をなし、主部材78の先端面78Aと面一の先端面86Aを有する。換言すると、先端壁86は、内周壁84と延出壁88との接続部をなしており、軸状部76の径方向に延在していることにより、内周壁84および延出壁88に比して径方向の肉厚が厚く、同方向には内周壁84および延出壁88に比して高い剛性を有して内周壁84と延出壁88との接続部を主部材78に対して剛固に固定する固定点をなしている。 The tip wall 86 extends in the direction perpendicular to the axial direction of the shaft-shaped portion 76, that is, radially outward of the shaft-shaped portion 76 from the inner peripheral wall 84 and the extending wall 88, and forms an annular flange shape. 78 has a tip surface 78A that is flush with the tip surface 78A. In other words, the distal end wall 86 forms a connecting portion between the inner peripheral wall 84 and the extending wall 88, and extends in the radial direction of the shaft-shaped portion 76, thereby causing the inner peripheral wall 84 and the extending wall 88 to be connected to each other. Compared with the inner peripheral wall 84 and the extension wall 88 in the same direction, the wall thickness in the radial direction is higher than that of the inner peripheral wall 84 and the extension wall 88. On the other hand, it has a fixed point that is fixed firmly.
 先端面78Aおよび86Aは、これらに当接するまで被クランプ物Wcが延出壁88の外側に挿入されることにより、被クランプ物Wcの軸線方向の位置決めを行うと共に、被クランプ物Wcが倒れることを阻止する。これにより、被クランプ物Wcは軸状部76に真直性をもって同心に配置される。 The tip surfaces 78A and 86A are positioned in the axial direction of the object to be clamped Wc until the object to be clamped Wc is inserted outside the extension wall 88 until they are in contact with them, and the object to be clamped Wc falls down. To prevent. Thereby, the clamped object Wc is arranged concentrically with straightness on the shaft-like portion 76.
 主部材78には軸状部76と同心にピストン室90が形成されている。ピストン室90の一端側にはピストン92が軸線方向に移動可能に嵌合している。ピストン室90の他端側は主部材78に形成された連通孔94、96によって作動流体室82に連通している。作動流体室82とピストン室90と連通孔94、96とは一つの密閉空間を画成しており、当該密閉空間には、非圧縮性流体として作動油が充填封入されている。 A piston chamber 90 is formed in the main member 78 concentrically with the shaft-like portion 76. A piston 92 is fitted to one end side of the piston chamber 90 so as to be movable in the axial direction. The other end side of the piston chamber 90 communicates with the working fluid chamber 82 through communication holes 94 and 96 formed in the main member 78. The working fluid chamber 82, the piston chamber 90, and the communication holes 94 and 96 define one sealed space, and the sealed space is filled and filled with hydraulic oil as an incompressible fluid.
 取付用フランジ部74の軸状部76とは反対の側には円柱状部98が取付用フランジ部74と同心に突出形成されている。円柱状部98にはピストン92の配置部に連通するねじ孔100がピストン室90の軸線方向の延長上に形成されている。ねじ孔100は円柱状部98の先端面(主部材78の先端面78Aとは反対側の先端面)に開口している。ねじ孔100には開口端の側から挿入された作動ねじ部材102の雄ねじ部104がねじ係合している。雄ねじ部104とピストン92との間には鋼球108が両者に挟まれるようにして配置されている。作動ねじ部材102はねじ孔100の開口端より外方に突出した六角柱部106を雄ねじ部104と一体に有する。このようにして作動流体室82の作動油を加圧する加圧手段がクランプ本体72に構成される。 A cylindrical portion 98 is formed concentrically with the mounting flange portion 74 on the side opposite to the shaft-shaped portion 76 of the mounting flange portion 74. A screw hole 100 communicating with the arrangement portion of the piston 92 is formed in the columnar portion 98 on the extension of the piston chamber 90 in the axial direction. The screw hole 100 is open to the distal end surface of the cylindrical portion 98 (the distal end surface opposite to the distal end surface 78A of the main member 78). A male screw portion 104 of an operating screw member 102 inserted from the open end side is screwed into the screw hole 100. A steel ball 108 is disposed between the male screw portion 104 and the piston 92 so as to be sandwiched between the two. The operating screw member 102 has a hexagonal column portion 106 that projects outward from the opening end of the screw hole 100, and the male screw portion 104. In this manner, a pressurizing unit that pressurizes the hydraulic oil in the working fluid chamber 82 is configured in the clamp body 72.
 作動ねじ部材102は、六角柱部106に係合する六角スパナ等の工具によってねじ込み側に廻され、図9で見て右側に螺進すると、鋼球108を介してピストン92が右側に軸線方向移動し、作動流体室82、ピストン室90および連通孔94、96に密閉されている作動油の圧力が上昇する。作動油の圧力上昇によって内周壁84が軸状部76の縮径方向に膨らむように弾性変形する。 The operating screw member 102 is turned to the screwing side by a tool such as a hexagonal spanner engaged with the hexagonal column portion 106, and when screwed to the right side in FIG. 9, the piston 92 is axially moved to the right side via the steel ball 108. It moves and the pressure of the hydraulic fluid sealed in the working fluid chamber 82, the piston chamber 90 and the communication holes 94 and 96 rises. The inner peripheral wall 84 is elastically deformed so as to swell in the direction of diameter reduction of the shaft-like portion 76 due to the pressure increase of the hydraulic oil.
 内周壁84が縮径方向に膨らむように弾性変形すると、図11に示されているように、延出壁88が、内周壁84と延出壁88との連結体の主部材78に対する固定点をなす先端壁86を梃子の支点のようにして、軸状部76の径方向外方に変位する。この変位によって、延出壁88が被クランプ物Wcの円形の内輪郭に押し付けられ、被クランプ物Wcのクランプが行われる。 When the inner peripheral wall 84 is elastically deformed so as to swell in the reduced diameter direction, as shown in FIG. 11, the extension wall 88 is fixed to the main member 78 of the coupling body of the inner peripheral wall 84 and the extension wall 88. The distal end wall 86 forming the above is displaced outwardly in the radial direction of the shaft-like portion 76 like a fulcrum of the insulator. By this displacement, the extension wall 88 is pressed against the circular inner contour of the clamped object Wc, and the clamped object Wc is clamped.
 これにより、片持ち梁状の延出壁88が、鉗子の先端で被クランプ物Wcを掴むようにクランプするから、被クランプ物Wcが軸長が短いものであっても、確実にクランプすることができる。 As a result, the cantilevered extension wall 88 clamps the clamped object Wc at the tip of the forceps so that the clamped object Wc can be reliably clamped even if the clamped object Wc has a short axial length. Can do.
 延出壁88は、被クランプ物Wcの内輪郭形状と同じ円筒状であって内周壁84と同一横断面の円環状であることにより、内周壁84の弾性変形によって周方向の全域に亘って一様に径方向内方に変位するから、延出壁88による被クランプ物Wcの外輪郭のクランプが軸状部76に対して高い同心性をもって高精度に行われる。 The extending wall 88 has the same cylindrical shape as the inner contour shape of the clamped object Wc and has an annular shape having the same cross section as that of the inner peripheral wall 84, so that it extends over the entire region in the circumferential direction by elastic deformation of the inner peripheral wall 84. Since it is displaced uniformly inward in the radial direction, the outer wall of the clamped object Wc is clamped by the extending wall 88 with high concentricity and high accuracy with respect to the shaft-like portion 76.
 延出壁88の軸線方向の寸法が被クランプ物Wcの軸線方向の寸法より小さく、延出壁88と被クランプ物Wcとの軸線方向の寸法差が被クランプ物Wcの端面加工代より大きく、当該寸法差を延出壁88の軸長設定によって端面加工の工具が延出壁88と干渉しない値に設定することができるから、流体圧式クランプ装置10によって外輪郭をクランプされている軸長が短い被クランプ物Wcの端面加工を支障なく行うことができる。 The axial dimension of the extending wall 88 is smaller than the axial dimension of the clamped object Wc, and the axial dimension difference between the extending wall 88 and the clamped object Wc is larger than the end face machining allowance of the clamped object Wc. Since the dimensional difference can be set to a value at which the end face machining tool does not interfere with the extending wall 88 by setting the axial length of the extending wall 88, the axial length whose outer contour is clamped by the hydraulic clamping device 10 is The end face processing of the short clamped object Wc can be performed without hindrance.
 また、被クランプ物Wcが先端面78Aおよび86Aに当接するまで延出壁88の外側に挿入されることにより、被クランプ物Wcの軸線方向の位置決めが行われると共に、被クランプ物Wcが倒れることを阻止される。これにより、被クランプ物Wcは軸状部76に対して高い真直性をもって同心にクランプされる。 Further, the object to be clamped Wc is inserted outside the extending wall 88 until it abuts against the tip surfaces 78A and 86A, whereby the object to be clamped Wc is positioned in the axial direction and the object to be clamped Wc falls down. Is prevented. Thereby, the clamped object Wc is clamped concentrically with high straightness with respect to the shaft-like portion 76.
 作動ねじ部材102が弛み側に廻され、図8で見て左側に螺進すると、作動油の圧力によって押されるようにしてピストン92が左側に軸線方向移動し、作動流体室82、ピストン室90および連通孔94、96に密閉されている作動油の圧力が降下する。作動油の圧力がもとの状態(略大気圧)に戻ると、内周壁84の弾性変形がなくなり、延出壁88が元の状態に戻る。 When the operating screw member 102 is turned to the slack side and screwed to the left as viewed in FIG. 8, the piston 92 is axially moved to the left as if pushed by the pressure of the operating oil, and the working fluid chamber 82 and the piston chamber 90 are moved. And the pressure of the hydraulic fluid sealed by the communicating holes 94 and 96 falls. When the pressure of the hydraulic oil returns to the original state (substantially atmospheric pressure), the inner peripheral wall 84 is not elastically deformed, and the extending wall 88 returns to the original state.
 延出壁88が元の状態に戻ると、延出壁88が被クランプ物Wcの内輪郭に押し付けられることが解除され、被クランプ物Wcのクランプが解除される。 When the extension wall 88 returns to the original state, the extension wall 88 is released from being pressed against the inner contour of the workpiece Wc, and the clamp of the workpiece Wc is released.
 上述の如く、流体圧式クランプ装置70は、多くの構成部品を必要とすることなく、簡素な構造をもって軸長が短い被クランプ物Wcを適切にクランプおよびアンクランプすることができる。 As described above, the hydraulic clamping device 70 can appropriately clamp and unclamp the clamped object Wc having a short shaft length with a simple structure without requiring many components.
 実施形態3の変形実施形態として、図12に示されているように、先端壁86と内周壁84とを接続する隅角部および先端壁86と延出壁88とを接続する隅角部に、先端壁86の肉厚を薄くする円環状の凹部87が形成されていてもよい。 As a modified embodiment of the third embodiment, as shown in FIG. 12, the corner portion connecting the tip wall 86 and the inner peripheral wall 84 and the corner portion connecting the tip wall 86 and the extension wall 88 are connected. An annular recess 87 that reduces the thickness of the tip wall 86 may be formed.
 凹部87が設けられていると、延出壁88が先端壁86を梃子の支点のようにして軸状部76の径方向外方に変位することが容易になり、作動流体室82の内圧上昇が少なくても、延出壁88による被クランプ物Wcのクランプが所要のクランプ力をもって行われるようになる。 When the recess 87 is provided, the extension wall 88 can easily displace the distal end wall 86 radially outward of the shaft-like portion 76 like a fulcrum of the insulator, and the internal pressure of the working fluid chamber 82 increases. Even if there is little, clamping of the to-be-clamped object Wc by the extension wall 88 will be performed with a required clamping force.
 本発明による流体圧式クランプ装置の実施形態4を、図13を参照して説明する。なお、図13において、図8に対応する部分は、図8に付した符号と同一の符号を付けて、その説明を省略する。 Embodiment 4 of the hydraulic clamping device according to the present invention will be described with reference to FIG. In FIG. 13, portions corresponding to those in FIG. 8 are denoted by the same reference numerals as those in FIG. 8, and description thereof is omitted.
 実施形態4では、被クランプ物Wdの内輪郭が四角形であることにより、筒状部77の内筒部が四角形の横断面形状になっており、これに併せて作動流体室82も四角形の横断面形状になっていると共に、内周壁84および延出壁88は四角筒状に形成されている。 In the fourth embodiment, since the inner contour of the clamped object Wd is a quadrangle, the inner cylindrical part of the cylindrical part 77 has a quadrangular cross-sectional shape. The inner peripheral wall 84 and the extending wall 88 are formed in a rectangular tube shape while being in the shape of a plane.
 この形状の違い以外のことは実施形態3と実質的に同一に構成されている。したがって、実施形態4でも実施形態3と同等の効果が得られる。 Other than the difference in shape, the configuration is substantially the same as that of the third embodiment. Therefore, the same effect as in the third embodiment can be obtained in the fourth embodiment.
 なお、実施形態4では、内周壁84、先端壁86、延出壁88は、軸状部76と一体の構成になっている。 In the fourth embodiment, the inner peripheral wall 84, the tip wall 86, and the extending wall 88 are integrated with the shaft-like portion 76.
 本発明による流体圧式クランプ装置の実施形態5を、図14および図15を参照して説明する。 Embodiment 5 of a hydraulic clamping device according to the present invention will be described with reference to FIGS.
 流体圧式クランプ装置110は円筒形状のクランプ本体112を有する。クランプ本体112は、その全体が筒状部をなすものであり、円筒形状の大部分を構成する主部材114と、主部材114の内周にろう付け等によって固定されたスリーブ部材116とを含む。主部材114およびスリーブ部材116はステンレス鋼等の金属材料あるいは硬質の合成樹脂、セラミック等によって構成されている。 The fluid pressure type clamp device 110 has a cylindrical clamp body 112. The clamp body 112 forms a cylindrical portion as a whole, and includes a main member 114 that constitutes a major portion of the cylindrical shape, and a sleeve member 116 that is fixed to the inner periphery of the main member 114 by brazing or the like. . The main member 114 and the sleeve member 116 are made of a metal material such as stainless steel, hard synthetic resin, ceramic, or the like.
 主部材114はスリーブ部材116と協働して内周近傍を軸線方向に主部材114の端面近傍まで延在した円環横断面形状の作動流体室118を構成している。 The main member 114 constitutes a working fluid chamber 118 having an annular cross section extending in the axial direction to the vicinity of the end face of the main member 114 in cooperation with the sleeve member 116.
 スリーブ部材116は、主部材114の軸線方向に延在して作動流体室118の内周を画定する薄肉の円筒状の内周壁120と、内周壁120と直交する方向(主部材114の径方向)に延在して作動流体室118の軸線方向の先端を画定する外向きの円環フランジ状の先端壁122と、先端壁122より内周壁120の軸線方向(主部材114の軸線方向)の延長線上に延出した片持ち梁による円筒状の延出壁124とを一体に有する。なお、作動流体室118の軸線方向の先端は、前述の主部材114の端面近傍と同じ側の端部である。 The sleeve member 116 includes a thin cylindrical inner peripheral wall 120 that extends in the axial direction of the main member 114 and defines the inner periphery of the working fluid chamber 118, and a direction orthogonal to the inner peripheral wall 120 (the radial direction of the main member 114 ) Extending outwardly to define the axial tip of the working fluid chamber 118, and the axial direction of the inner peripheral wall 120 from the tip wall 122 (the axial direction of the main member 114). A cylindrical extension wall 124 is integrally formed by a cantilever beam extending on the extension line. Note that the tip of the working fluid chamber 118 in the axial direction is the end on the same side as the vicinity of the end face of the main member 114 described above.
 延出壁124は、内周壁120と同心で、軸線方向長さ(軸長)が内周壁120の軸線方向長さより短く、内周壁120の径方向の肉厚に略等しい径方向の肉厚を有し、内周壁120と同一横断面の円環状である。延出壁124は、円環状の被クランプ物Weの内輪郭形状と同じ円筒状をしており、外側に被クランプ物Weを受け入れ、被クランプ物Weの内周(全周)を囲繞する。延出壁124の外径は、自然状態で、被クランプ物Weの内径に等しいか、内径より僅かに小さい寸法に設定されている。 The extension wall 124 is concentric with the inner peripheral wall 120, has an axial length (axial length) shorter than the axial length of the inner peripheral wall 120, and has a radial thickness substantially equal to the radial thickness of the inner peripheral wall 120. And has an annular shape having the same cross section as the inner peripheral wall 120. The extending wall 124 has the same cylindrical shape as the inner contour shape of the annular clamped object We, receives the clamped object We on the outside, and surrounds the inner periphery (entire circumference) of the clamped object We. The outer diameter of the extension wall 124 is set to a dimension that is equal to or slightly smaller than the inner diameter of the workpiece We in the natural state.
 被クランプ物Weは軸長が短いものであり、延出壁124の軸線方向の寸法(延出長)は被クランプ物Weの軸線方向の寸法より小さい。被クランプ物Weの端面を加工する場合には、延出壁124と被クランプ物Weとの軸線方向の寸法差は、少なくともその端面加工代より大きく、端面加工の工具が延出壁124と干渉しない値に設定されている。 The clamped object We has a short axial length, and the axial dimension (extension length) of the extension wall 124 is smaller than the axial dimension of the clamped object We. When the end surface of the workpiece We is to be machined, the dimensional difference between the extending wall 124 and the workpiece We in the axial direction is at least larger than the end surface machining allowance, and the end surface machining tool interferes with the extending wall 124. It is set to a value that does not.
 先端壁122は、内周壁120および延出壁124より厚い肉厚(軸線方向の厚さ)を有して主部材114の軸線方向に直交する方向、つまり内周壁120および延出壁124より主部材114の径方向外方に延在して円環フランジ状をなし、主部材114の先端面114Aと面一の先端面122Aを有する。換言すると、先端壁122は、内周壁120と延出壁124との接続部をなしており、内周壁120および延出壁124より厚い肉厚をもって主部材114の径方向に延在していることにより、内周壁120および延出壁124に比して高い剛性を有して内周壁120と延出壁124との接続部を主部材114に対して剛固に固定する固定点をなしている。 The distal end wall 122 has a wall thickness (thickness in the axial direction) that is thicker than the inner peripheral wall 120 and the extending wall 124 and is perpendicular to the axial direction of the main member 114, that is, the inner wall 120 and the extending wall 124. The member 114 extends outward in the radial direction to form an annular flange shape, and has a front end surface 122A that is flush with the front end surface 114A of the main member 114. In other words, the tip wall 122 forms a connecting portion between the inner peripheral wall 120 and the extending wall 124, and extends in the radial direction of the main member 114 with a thickness greater than the inner peripheral wall 120 and the extending wall 124. As a result, it has a higher rigidity than the inner peripheral wall 120 and the extension wall 124 and serves as a fixing point for firmly fixing the connecting portion between the inner peripheral wall 120 and the extension wall 124 to the main member 114. Yes.
 先端面114Aおよび122Aは、これらに当接するまで被クランプ物Weが延出壁124の外側に挿入されることにより、被クランプ物Weの軸線方向の位置決めを行うと共に、被クランプ物Weが倒れることを阻止する。これにより、被クランプ物Weはクランプ本体112に真直性をもって同心に配置される。 The tip surfaces 114A and 122A are positioned in the axial direction of the object to be clamped Wel and the object to be clamped We fall down by inserting the object to be clamped Wel outside the extending wall 124 until they abut against them. To prevent. Thereby, the clamped object We is disposed concentrically with straightness on the clamp body 112.
 主部材114にはピストン室126が形成されている。ピストン室126の一端側にはピストン128がピストン室126の長手方向に移動可能に嵌合している。ピストン室126の他端側は主部材114に形成された連通孔130によって作動流体室118に連通している。作動流体室118とピストン室126と連通孔130とは一つの密閉空間を画成しており、当該密閉空間には、非圧縮性流体として作動油が充填封入されている。 A piston chamber 126 is formed in the main member 114. A piston 128 is fitted to one end side of the piston chamber 126 so as to be movable in the longitudinal direction of the piston chamber 126. The other end side of the piston chamber 126 communicates with the working fluid chamber 118 through a communication hole 130 formed in the main member 114. The working fluid chamber 118, the piston chamber 126, and the communication hole 130 define one sealed space, and the sealed space is filled and filled with hydraulic oil as an incompressible fluid.
 主部材114には、作動油の充填時の作動流体室118、ピストン室126の空気抜きを行う空気抜き孔140、142が形成されている。空気抜き孔140、142は、空気抜き作用後に、シールねじ144、146によって塞がれる。 The main member 114 is formed with air vent holes 140 and 142 for venting the working fluid chamber 118 and the piston chamber 126 when the hydraulic oil is filled. The air vent holes 140 and 142 are closed by seal screws 144 and 146 after the air venting action.
 主部材114にはピストン128の配置部に連通するねじ孔132がピストン室126の軸線方向の延長上に形成されている。ねじ孔132は主部材114の外周面に開口している。ねじ孔132には開口端の側から挿入された作動ねじ部材134がねじ係合している。作動ねじ部材134とピストン128との間には鋼球136が両者に挟まれるようにして配置されている。このようにして作動流体室118の作動油を加圧する加圧手段がクランプ本体112に構成される。 The main member 114 is formed with a screw hole 132 communicating with the arrangement portion of the piston 128 on the extension of the piston chamber 126 in the axial direction. The screw hole 132 opens on the outer peripheral surface of the main member 114. An operating screw member 134 inserted from the opening end side is screwed into the screw hole 132. A steel ball 136 is disposed between the operating screw member 134 and the piston 128 so as to be sandwiched therebetween. In this manner, a pressurizing unit that pressurizes the hydraulic oil in the working fluid chamber 118 is configured in the clamp body 112.
 作動ねじ部材134は、六角孔付きのねじ部材であり、六角レンチ等の工具によってねじ込み側に廻され、図15で見て上側に螺進すると、鋼球136を介してピストン128が上側に移動し、作動流体室118、ピストン室126および連通孔130に密閉されている作動油の圧力が上昇する。作動油の圧力上昇によって内周壁120がクランプ本体112の縮径方向に膨らむように弾性変形する。 The operating screw member 134 is a screw member with a hexagonal hole, and is rotated to the screwing side by a tool such as a hexagon wrench. When the screw is screwed upward as viewed in FIG. 15, the piston 128 moves upward via the steel ball 136. Then, the pressure of the hydraulic fluid sealed in the working fluid chamber 118, the piston chamber 126, and the communication hole 130 increases. The inner peripheral wall 120 is elastically deformed so as to swell in the direction of diameter reduction of the clamp body 112 due to the pressure increase of the hydraulic oil.
 内周壁120が縮径方向に膨らむように弾性変形すると、図11に示されているように、延出壁124が、内周壁120と延出壁124との連結体の主部材114に対する固定点をなす先端壁122を梃子の支点のようにして、クランプ本体112の径方向外方に変位する。この変位によって、延出壁124が被クランプ物Weの円形の内輪郭に押し付けられ、被クランプ物Weのクランプが行われる。 When the inner peripheral wall 120 is elastically deformed so as to swell in the diameter reducing direction, as shown in FIG. 11, the extension wall 124 is fixed to the main member 114 of the coupling body of the inner peripheral wall 120 and the extension wall 124. The distal end wall 122 is formed like a lever fulcrum and is displaced radially outward of the clamp body 112. By this displacement, the extension wall 124 is pressed against the circular inner contour of the clamped object We, and the clamped object We is clamped.
 これにより、片持ち梁状の延出壁124が、鉗子の先端で被クランプ物Weを掴むようにクランプするから、被クランプ物Weが軸長が短いものであっても、確実にクランプすることができる。 As a result, the cantilever-like extending wall 124 clamps the clamped object We at the tip of the forceps so that the clamped object We can be reliably clamped even if the clamped object We has a short axial length. Can do.
 延出壁124は、被クランプ物Weの内輪郭形状と同じ円筒状であって内周壁120と同一横断面の円環状であることにより、内周壁120の弾性変形によって周方向の全域に亘って一様に径方向内方に変位するから、延出壁124による被クランプ物Weの内輪郭のクランプがクランプ本体112に対して高い同心性をもって高精度に行われる。 The extending wall 124 has the same cylindrical shape as the inner contour shape of the clamped object We and has an annular shape having the same cross section as that of the inner peripheral wall 120, so that it extends over the entire region in the circumferential direction due to elastic deformation of the inner peripheral wall 120. Since the inner wall of the clamped object We is clamped by the extending wall 124 with high concentricity with high concentricity, it is uniformly displaced radially inward.
 延出壁124の軸線方向の寸法が被クランプ物Weの軸線方向の寸法より小さく、延出壁124と被クランプ物Weとの軸線方向の寸法差が被クランプ物Weの端面加工代より大きく、当該寸法差を延出壁124の軸長設定によって端面加工の工具が延出壁124と干渉しない値に設定することができるから、流体圧式クランプ装置110によって外輪郭をクランプされている軸長が短い被クランプ物Weの端面加工を支障なく行うことができる。 The axial dimension of the extending wall 124 is smaller than the axial dimension of the clamped object We, and the axial dimension difference between the extending wall 124 and the clamped object We is larger than the end face machining allowance of the clamped object We; Since the dimensional difference can be set to a value at which the end face machining tool does not interfere with the extending wall 124 by setting the axial length of the extending wall 124, the axial length whose outer contour is clamped by the hydraulic clamping device 110 is reduced. The end face processing of the short clamped object We can be performed without hindrance.
 また、被クランプ物Weが先端面114Aおよび122Aに当接するまで延出壁124の外側に挿入されることにより、被クランプ物Weの軸線方向の位置決めが行われると共に、被クランプ物Weが倒れることを阻止される。これにより、被クランプ物Weはクランプ本体112に対して高い真直性をもって同心にクランプされる。 Further, by inserting the workpiece We into the outside of the extending wall 124 until it abuts against the front end surfaces 114A and 122A, the workpiece We is positioned in the axial direction, and the workpiece We is tilted. Is prevented. As a result, the workpiece We is clamped concentrically with high straightness with respect to the clamp body 112.
 作動ねじ部材134が弛み側に廻され、図15で見て下側に螺進すると、作動油の圧力によって押されるようにしてピストン128が下側に移動し、作動流体室118、ピストン室126および連通孔130に密閉されている作動油の圧力が降下する。作動油の圧力がもとの状態(略大気圧)に戻ると、内周壁120の弾性変形がなくなり、延出壁124が元の状態に戻る。 When the operating screw member 134 is turned to the slack side and screwed downward as viewed in FIG. 15, the piston 128 moves downward so as to be pushed by the pressure of the operating oil, and the working fluid chamber 118 and the piston chamber 126 are moved. In addition, the pressure of the hydraulic oil sealed in the communication hole 130 decreases. When the pressure of the hydraulic oil returns to the original state (approximately atmospheric pressure), the inner peripheral wall 120 is not elastically deformed, and the extending wall 124 returns to the original state.
 延出壁124が元の状態に戻ると、延出壁124が被クランプ物Weの内輪郭に押し付けられることが解除され、被クランプ物Weのクランプが解除される。 When the extending wall 124 returns to the original state, the pressing of the extending wall 124 against the inner contour of the workpiece We is released, and the clamping of the workpiece We is released.
 上述の如く、流体圧式クランプ装置110は、多くの構成部品を必要とすることなく、簡素な構造をもって軸長が短い被クランプ物Weを適切にクランプおよびアンクランプすることができる。 As described above, the hydraulic clamping device 110 can appropriately clamp and unclamp a workpiece We having a short shaft length with a simple structure without requiring many components.
 上述した実施形態1~5では、作動流体室22、60、82あるいは118の内圧上昇によって被クランプ物Wa~Weをクランプし、作動流体室22、60、82あるいは118の内圧を大気圧あるいは大気圧近くのデフォルト状態に戻すことによって被クランプ物Wa~Weのアンクランプを行うが、作動流体室22、60、82あるいは118の内圧が大気圧あるいは大気圧近くのデフォルト状態で、被クランプ物Wa~Weのクランプを行い、作動流体室22、60、82あるいは118の内圧上昇によって被クランプ物Wa~Weのアンクランプを行うように構成することもできる。 In the above-described first to fifth embodiments, the workpieces Wa to We are clamped by the increase in the internal pressure of the working fluid chamber 22, 60, 82, or 118, and the internal pressure of the working fluid chamber 22, 60, 82, or 118 is set to atmospheric pressure or high. The object to be clamped Wa to We is unclamped by returning to the default state near the atmospheric pressure, but the object to be clamped Wa is in the default state where the internal pressure of the working fluid chamber 22, 60, 82 or 118 is atmospheric pressure or near atmospheric pressure. The clamped objects Wa to We can be unclamped by clamping the pressures We to We and increasing the internal pressure of the working fluid chambers 22, 60, 82 or 118.
 図16に示されている実施形態は、実施形態1と同等の構成で、作動流体室22の内圧が大気圧あるいは大気圧近くのデフォルト状態で、延出壁28の外径が円環状の被クランプ物Weの内径より大きいことにより、延出壁28の外周において被クランプ物Weの内輪郭のクランプを行い、作動流体室22の内圧上昇によって延出壁28が径方向内側に変位することにより、被クランプ物Weのアンクランプを行う。 The embodiment shown in FIG. 16 has the same configuration as that of the first embodiment, and the working fluid chamber 22 has a default state in which the internal pressure of the working fluid chamber 22 is atmospheric pressure or near atmospheric pressure, and the extending wall 28 has an annular outer diameter. Since the inner diameter of the clamped object We is larger than that of the clamped object We, the inner contour of the clamped object We is clamped on the outer periphery of the extension wall 28, and the extension wall 28 is displaced radially inward due to the increase in the internal pressure of the working fluid chamber 22. Then, unclamping of the workpiece We is performed.
 この実施形態では、スリーブ部材20の外周に、被クランプ物Weの軸線方向の位置決めを行う円環状の位置決めフランジ21が形成されていてよい。 In this embodiment, an annular positioning flange 21 for positioning the workpiece We in the axial direction may be formed on the outer periphery of the sleeve member 20.
 図17に示されている実施形態は、実施形態3と同等の構成で、作動流体室82の内圧が大気圧あるいは大気圧近くのデフォルト状態で、延出壁88の内径が円盤状の被クランプ物Waの外径より小さいことにより、延出壁88の内周において被クランプ物Waの外輪郭のクランプを行い、作動流体室82の内圧上昇によって延出壁88が径方向外側に変位することにより、被クランプ物Waのアンクランプを行う。 The embodiment shown in FIG. 17 has the same configuration as that of the third embodiment, and the internal pressure of the working fluid chamber 82 is the atmospheric pressure or the default state near atmospheric pressure, and the extending wall 88 has a disk-like inner diameter. Since the outer diameter of the object Wa is smaller, the outer contour of the object to be clamped Wa is clamped on the inner periphery of the extension wall 88, and the extension wall 88 is displaced radially outward by the increase in the internal pressure of the working fluid chamber 82. In this way, the workpiece Wa is unclamped.
 この実施形態では、スリーブ部材80の内周に、被クランプ物Waの軸線方向の位置決めを行う円環状の位置決めフランジ81が形成されていてよい。 In this embodiment, an annular positioning flange 81 for positioning the workpiece Wa in the axial direction may be formed on the inner periphery of the sleeve member 80.
 以上、本発明を、その好適な実施形態について説明したが、当業者であれば容易に理解できるように、本発明はこのような実施形態により限定されるものではなく、本発明の趣旨を逸脱しない範囲で適宜変更可能である。 Although the present invention has been described above with reference to preferred embodiments thereof, the present invention is not limited to such embodiments and can be deviated from the spirit of the present invention, as will be readily understood by those skilled in the art. It is possible to change appropriately within the range not to be.
 上述の実施形態では、外周壁24、先端壁26、延出壁28や、外周壁52、先端壁54、延出壁56は、主部材18とは別部品のスリーブ部材20や板状部材50によって構成されているが、これらは別部品を用いることなく主部材18に一体に構成されていてもよい。また、内周壁84、先端壁86、延出壁88や、内周壁120、先端壁122、延出壁124も、スリーブ部材80、116等の別部品を用いることなく主部材78あるいは114に一体に構成されていてもよい。 In the above-described embodiment, the outer peripheral wall 24, the distal end wall 26, the extending wall 28, the outer peripheral wall 52, the distal end wall 54, and the extending wall 56 are the sleeve member 20 and the plate-like member 50 that are separate parts from the main member 18. However, these may be formed integrally with the main member 18 without using separate parts. Further, the inner peripheral wall 84, the tip wall 86, the extending wall 88, the inner peripheral wall 120, the tip wall 122, and the extending wall 124 are also integrated with the main member 78 or 114 without using separate parts such as the sleeve members 80 and 116. It may be configured.
 作動流体室22の作動油を加圧する加圧手段は、クランプ本体12とは別置きされて遠隔操作されるものであってもよい。また、この加圧手段は、アクチュエータやカム機構等を用いてピストン32やピストンロッド等を押すような構造のものであってもよい。 The pressurizing means for pressurizing the hydraulic oil in the working fluid chamber 22 may be separately placed from the clamp body 12 and remotely operated. The pressurizing means may have a structure that pushes the piston 32, the piston rod, or the like using an actuator, a cam mechanism, or the like.
 また、上記実施形態に示した構成要素は必ずしも全てが必須なものではなく、本発明の趣旨を逸脱しない限りにおいて適宜取捨選択することが可能である。 Further, all the components shown in the above embodiment are not necessarily essential, and can be appropriately selected without departing from the spirit of the present invention.
 10  流体圧式クランプ装置
 12  クランプ本体
 14  取付用フランジ部
 16  軸状部
 18  主部材
 18A 小径部
 18B 先端面
 18C 三角柱部
 18D 凹部
 20  スリーブ部材
 21  位置決めフランジ
 22  作動流体室
 24  外周壁
 26  先端壁
 26A 先端面
 27  凹部
 28  延出壁
 30  ピストン室
 32  ピストン
 34  連通孔
 36  連通孔
 38  円柱状部
 40  ねじ孔
 42  作動ねじ部材
 44  雄ねじ部
 46  六角柱部
 48  鋼球
 50  板状部材
 52  外周壁
 54  先端壁
 56  延出壁
 60  作動流体室
 70  流体圧式クランプ装置
 72  クランプ本体
 74  取付用フランジ部
 76  軸状部
 77  筒状部
 78  主部材
 78A 先端面
 80  スリーブ部材
 81  位置決めフランジ
 82  作動流体室
 84  内周壁
 86  先端壁
 86A 先端面
 87  凹部
 88  延出壁
 90  ピストン室
 92  ピストン
 94  連通孔
 96  連通孔
 98  円柱状部
 100 ねじ孔
 102 作動ねじ部材
 104 雄ねじ部
 106 六角柱部
 108 鋼球
 110 流体圧式クランプ装置
 112 クランプ本体
 114 主部材
 114A 先端面
 116 スリーブ部材
 118 作動流体室
 120 内周壁
 122 先端壁
 122A 先端面
 124 延出壁
 126 ピストン室
 128 ピストン
 130 連通孔
 132 ねじ孔
 134 作動ねじ部材
 136 鋼球
 140 空気抜き孔
 144 シールねじ
 146 シールねじ
 Wa  被クランプ物
 Wb  被クランプ物
 Wc  被クランプ物
 Wd  被クランプ物
 We  被クランプ物
DESCRIPTION OF SYMBOLS 10 Fluid pressure type clamp apparatus 12 Clamp main body 14 Mounting flange part 16 Shaft-shaped part 18 Main member 18A Small diameter part 18B End face 18C Triangular prism part 18D Recessed part 20 Sleeve member 21 Positioning flange 22 Working fluid chamber 24 Outer peripheral wall 26 Front end wall 26A Front end face 27 recessed portion 28 extending wall 30 piston chamber 32 piston 34 communicating hole 36 communicating hole 38 cylindrical portion 40 screw hole 42 operating screw member 44 male screw portion 46 hexagonal column portion 48 steel ball 50 plate-like member 52 outer peripheral wall 54 tip wall 56 extending Outlet wall 60 Working fluid chamber 70 Fluid pressure type clamping device 72 Clamp body 74 Mounting flange portion 76 Shaft-shaped portion 77 Cylindrical portion 78 Main member 78A Tip surface 80 Sleeve member 81 Positioning flange 82 Working fluid chamber 84 Inner peripheral wall 86 Tip wall 86A tip Surface 87 Concave part 88 Extension wall 90 Piston chamber 92 Piston 94 Communication hole 96 Communication hole 98 Columnar part 100 Screw hole 102 Actuating screw member 104 Male thread part 106 Hexagonal column part 108 Steel ball 110 Fluid pressure type clamp device 112 Clamp body 114 Main member 114A front end surface 116 sleeve member 118 working fluid chamber 120 inner peripheral wall 122 front end wall 122A front end surface 124 extending wall 126 piston chamber 128 piston 130 communication hole 132 screw hole 134 operating screw member 136 steel ball 140 air vent hole 144 seal screw 146 seal screw Wa Clamped object Wb Clamped object Wc Clamped object Wd Clamped object We Clamped object

Claims (8)

  1.  軸状部を含み当該軸状部に作動流体室を形成されたクランプ本体と、前記作動流体室に充填された作動流体を加圧する加圧手段とを有する流体圧式クランプ装置であって、
     前記作動流体室は前記軸状部の外周近傍において軸線方向に当該軸状部の先端近傍まで延在しており、
     前記クランプ本体は、
     前記作動流体室の外周を画定する外周壁および前記作動流体室の軸線方向の先端を画定する先端壁と、
     前記先端壁より前記外周壁の軸線方向の延長線上に延出し、前記作動流体の加圧による前記外周壁の弾性変形によって前記先端壁を支点して前記軸状部の径方向内方に変位する片持ち梁状の延出壁とを有し、
     前記延出壁によって被クランプ物のクランプを行う流体圧式クランプ装置。
    A hydraulic clamping device having a clamp body including a shaft-like portion and having a working fluid chamber formed in the shaft-like portion, and a pressurizing means for pressurizing the working fluid filled in the working fluid chamber,
    The working fluid chamber extends in the axial direction in the vicinity of the outer periphery of the shaft-shaped portion to the vicinity of the tip of the shaft-shaped portion,
    The clamp body is
    An outer peripheral wall defining an outer periphery of the working fluid chamber and a tip wall defining an axial tip of the working fluid chamber;
    It extends from the tip wall onto an extension line in the axial direction of the outer peripheral wall, and is displaced inward in the radial direction of the shaft-like portion by supporting the tip wall by elastic deformation of the outer peripheral wall by pressurization of the working fluid. A cantilevered extending wall,
    A hydraulic clamping device for clamping an object to be clamped by the extending wall.
  2.  筒状部を含み当該筒状部に作動流体室を形成されたクランプ本体と、前記作動流体室に充填された作動流体を加圧する加圧手段とを有する流体圧式クランプ装置であって、
     前記作動流体室は前記筒状部の内周近傍において軸線方向に当該筒状部の先端近傍まで延在しており、
     前記クランプ本体は、
     前記作動流体室の内周を画定する内周壁および前記作動流体室の軸線方向の先端を画定する先端壁と、
     前記先端壁より前記内周壁の軸線方向の延長線上に延出し、前記作動流体の加圧による前記内周壁の弾性変形によって前記先端壁を支点して前記筒状部の径方向外方に変位する片持ち梁状の延出壁とを有し、
     前記延出壁によって被クランプ物のクランプを行う流体圧式クランプ装置。
    A hydraulic clamping device having a clamp body including a cylindrical portion and a working fluid chamber formed in the cylindrical portion, and a pressurizing means for pressurizing the working fluid filled in the working fluid chamber,
    The working fluid chamber extends in the axial direction in the vicinity of the inner periphery of the cylindrical portion to the vicinity of the tip of the cylindrical portion,
    The clamp body is
    An inner peripheral wall defining an inner periphery of the working fluid chamber and a tip wall defining an axial tip of the working fluid chamber;
    It extends from the tip wall to an extension line in the axial direction of the inner peripheral wall, and is displaced outwardly in the radial direction of the cylindrical portion by supporting the tip wall by elastic deformation of the inner peripheral wall due to pressurization of the working fluid. A cantilevered extending wall,
    A hydraulic clamping device for clamping an object to be clamped by the extending wall.
  3.  前記外周壁あるいは前記内周壁と前記先端壁と前記延出壁とが前記軸状部あるいは前記筒状部の大部分を構成する軸状部に作動とは別部材によって互いに一体に構成されている請求項1または2に記載の流体圧式クランプ装置。 The outer peripheral wall or the inner peripheral wall, the tip wall, and the extending wall are integrally formed with each other by a member different from the operation of the shaft-shaped portion or the cylindrical portion that constitutes the most part of the cylindrical portion. The hydraulic clamping device according to claim 1 or 2.
  4.  前記先端壁は、前記軸状部あるいは前記筒状部の軸線方向に直交する方向に延在して前記被クランプ物の軸線方向の位置決めを行う先端面を有している請求項1から3の何れか一項に記載の流体圧式クランプ装置。 The said front end wall has the front end surface which extends in the direction orthogonal to the axial direction of the said axial part or the said cylindrical part, and performs the axial positioning of the said to-be-clamped object. The fluid pressure type clamp device according to any one of the above.
  5.  前記外周壁あるいは前記内周壁と前記延出壁とが同一横断面の円環状である請求項1から4の何れか一項に記載の流体圧式クランプ装置。 The hydrostatic clamping device according to any one of claims 1 to 4, wherein the outer peripheral wall or the inner peripheral wall and the extending wall are annular in the same cross section.
  6.  前記外周壁あるいは前記内周壁と前記延出壁とが同一横断面の多角環状である請求項1から4の何れか一項に記載の流体圧式クランプ装置。 The hydrostatic clamping device according to any one of claims 1 to 4, wherein the outer peripheral wall or the inner peripheral wall and the extending wall are polygonal rings having the same cross section.
  7.  前記軸状部あるいは前記筒状部が多角形状であり、前記作動流体室と前記外周壁あるいは前記内周壁と前記延出壁とが多角形状の各辺に対応して個別に形成されている請求項1から4の何れか一項に記載の流体圧式クランプ装置。 The shaft-shaped portion or the cylindrical portion is polygonal, and the working fluid chamber and the outer peripheral wall or the inner peripheral wall and the extending wall are individually formed corresponding to each side of the polygonal shape. Item 5. The hydraulic clamping device according to any one of Items 1 to 4.
  8.  前記先端壁に当該先端壁の肉厚を薄くする凹部が形成されている請求項1から7の何れか一項に記載の流体圧式クランプ装置。 The fluid pressure clamping device according to any one of claims 1 to 7, wherein a concave portion for reducing the thickness of the tip wall is formed in the tip wall.
PCT/JP2015/003120 2015-06-22 2015-06-22 Fluid-pressure-operated clamp device WO2016207926A1 (en)

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PCT/JP2015/003120 WO2016207926A1 (en) 2015-06-22 2015-06-22 Fluid-pressure-operated clamp device
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019038066A (en) * 2017-08-25 2019-03-14 株式会社 神崎高級工機製作所 Work-piece supporting tool and gear processing device equipped with same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102197511B1 (en) * 2019-10-29 2020-12-31 주식회사 화영 Pipe machining equipment

Citations (3)

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Publication number Priority date Publication date Assignee Title
JPS59156714U (en) * 1983-04-07 1984-10-20 豊田工機株式会社 gripping device
JPH1142524A (en) * 1996-10-07 1999-02-16 Jack H Schron Jr Clamping device
JP2013043254A (en) * 2011-08-25 2013-03-04 Aisin Aw Co Ltd Work fixture

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59156714U (en) * 1983-04-07 1984-10-20 豊田工機株式会社 gripping device
JPH1142524A (en) * 1996-10-07 1999-02-16 Jack H Schron Jr Clamping device
JP2013043254A (en) * 2011-08-25 2013-03-04 Aisin Aw Co Ltd Work fixture

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019038066A (en) * 2017-08-25 2019-03-14 株式会社 神崎高級工機製作所 Work-piece supporting tool and gear processing device equipped with same
JP7006909B2 (en) 2017-08-25 2022-01-24 株式会社 神崎高級工機製作所 Work support and gear processing equipment equipped with this

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JPWO2016207926A1 (en) 2018-04-05
JP6518762B2 (en) 2019-05-22

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