EP3412411A1 - Système de serrage - Google Patents

Système de serrage Download PDF

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Publication number
EP3412411A1
EP3412411A1 EP18172783.5A EP18172783A EP3412411A1 EP 3412411 A1 EP3412411 A1 EP 3412411A1 EP 18172783 A EP18172783 A EP 18172783A EP 3412411 A1 EP3412411 A1 EP 3412411A1
Authority
EP
European Patent Office
Prior art keywords
clamping
elements
adjusting element
clamping elements
contact surface
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP18172783.5A
Other languages
German (de)
English (en)
Other versions
EP3412411B1 (fr
Inventor
Frank Nickl
Jacek Woryna
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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Publication date
Application filed by Individual filed Critical Individual
Publication of EP3412411A1 publication Critical patent/EP3412411A1/fr
Application granted granted Critical
Publication of EP3412411B1 publication Critical patent/EP3412411B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/061—Arrangements for positively actuating jaws with fluid drive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/003—Combinations of clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/061—Arrangements for positively actuating jaws with fluid drive
    • B25B5/064—Arrangements for positively actuating jaws with fluid drive with clamping means pivoting around an axis perpendicular to the pressing direction

Definitions

  • the invention relates to a clamping system for clamping a blank.
  • Such blanks may in particular be formed by castings 2, which typically consist of metallic materials.
  • FIG. 1 shows a clamping unit 1 according to the prior art to such a casting 2, in the present case, a die-cast, to fix on a base plate formed by a clamping plate 3.
  • the clamping unit comprises three separate clamping devices 4, which are anchored on the upper side of the clamping plate, wherein these clamping devices are preferably fixed by mechanical means on the clamping plate.
  • the jigs must be placed on the top of the chuck by a resource engineer to fix them at appropriate locations on the casting. This process is often cumbersome and time consuming. This is based in particular on the fact that after clamping on the clamping plate, the casting must be processed in predefined steps. The equipment engineer then has to fix the tensioning device in places of the casting that do not need to be machined later.
  • the invention has for its object to provide a clamping system by means of which a rational and reproducible clamping a blank is possible.
  • the invention relates to a clamping system for clamping a blank, with an arrangement of at least three clamping elements which are movable by means of an adjusting element between a release position and a clamping position.
  • the clamping elements are disengaged in the release position and in the clamping position in engagement with a contact surface of a receptacle of the tubular member.
  • the clamping elements are coupled via a spherical compensating element to the adjusting element, so that upon movements of the adjusting element in a clamping position, the spherical compensating element performs a compensating movement through which the clamping elements are uniformly guided against the contact surface of the receptacle.
  • the clamping system according to the invention can be used for clamping blanks of different types.
  • the blanks are in particular made of castings, which typically consist of metallic materials.
  • the blanks can also be formed by welded structures, Ausbrenn really and the like.
  • An essential advantage of the invention is that at least one receptacle is provided on the blank, which is provided on a side wall, in particular on the underside of the blank.
  • the blank can be placed with this side wall on a base and the clamping system can then be brought from the bottom of the pad to the blank in order to stretch this.
  • several shots can be provided on the side wall of the blank, so that the blank can be fixed to the pad with several clamping systems. This ensures that the upper side of the blank to be machined remains free, so that no restrictions arise for the machining of the blank due to the clamping system or systems.
  • Another essential advantage of the invention is that an automated machining of the blank is made possible with the clamping system according to the invention.
  • the execution of the clamping operations can be done automatically with the one or more clamping systems themselves.
  • the clamping system is actuated by means of a pneumatic system.
  • electrical or hydraulic actuating means may be provided, in the simplest case mechanical actuating means are provided.
  • the clamping operation is thus carried out automatically characterized in that the adjusting element is preferably moved with a pneumatic unit in a clamping position, whereby the clamping elements are moved to their clamping position, in which they are in engagement with the contact surface of the receptacle and so hold the blank in its desired position.
  • the release of the clamping elements of the contact surface is automatic and automatic.
  • the adjusting element is moved from the clamping position to a release position.
  • the clamping elements are automatically released from the contact surface of the recording.
  • This release operation is preferably supported by spring elements which exert corresponding restoring forces on the clamping elements.
  • this fact is taken into account that the individual clamping elements do not perform fixed predetermined relative movements for performing the clamping operation. If this were the case, due to tolerance-related irregularities in the geometry of the receptacle, it could happen that only a few but not all of them are firmly engaged with the contact surface when the clamping elements are moved, and thus not all the clamping elements contribute to the clamping process.
  • this problem is solved in a surprisingly simple manner in that the clamping elements are coupled via a spherical compensating element to the adjusting element, wherein the adjusting element is movably arranged on a support surface of the adjusting element.
  • the individual clamping elements are no longer rigidly coupled with each other and not rigidly to the adjusting element.
  • the clamping elements individually perform compensatory movements when this is introduced into the clamping position, which is ensured by these compensatory movements that all clamping elements are uniformly and thus pressed with substantially equal contact forces against the contact surface when the adjustment is retracted into the clamping position and the clamping elements are in their clamping positions.
  • This compensating movement generally takes place in that when a clamping element is guided against the contact surface, the clamping element exerts a counterforce on the spherical compensating element, whereby this is moved in the direction of the other clamping elements, which are not yet in contact with the contact surface.
  • the clamping elements are switched in such a way that during the movement of the adjusting the clamping elements are guided with the same contact pressures against the contact surface.
  • a uniform clamping process can be particularly well realized that the clamping elements are identical.
  • the clamping elements are mounted on pivot bearings.
  • each clamping element has at its front end a tip, which is guided in the clamping position of the clamping element against the contact surface of the receptacle.
  • the adjusting element is displaceable in its longitudinal direction.
  • the axes of the pivot bearing of the clamping elements are oriented perpendicular to the longitudinal axis of the adjusting element.
  • the bearing surface is formed by a front side of the adjusting element.
  • the support surface is a flat surface and the diameter of the support surface is adapted to the diameter of the spherical compensating element.
  • the pivoting movements of the clamping elements and the geometries of the tips of the clamping elements are adapted and optimized so that the tensioned blank rests against a contact surface, and that a force is exerted on the workpiece in the direction of the contact surface by the retracted into individual clamping positions clamping elements.
  • the receptacle is formed by a recess of the workpiece which opens out on a side wall, wherein the traveling segment of the workpiece bounding the recess forms the contact surface.
  • the recess has a circular cross-section, that is, the receptacle is formed as a hollow cylinder.
  • the clamping elements are inserted into the cavity of the receptacle from the inside, in which case the clamping elements are pivoted with their tips to the outside and are thus guided against the contact surface of the receptacle.
  • the clamping elements can be coupled via the spherical compensating element directly to the adjusting element.
  • the outer contours of the clamping elements are adapted to the spherical compensating element, that by the contact of the clamping elements with the spherical compensating element, the clamping elements are transferred upon movement of the adjusting element in the clamping position in its clamping position.
  • This provides a particularly simple mechanism for actuating the clamping elements.
  • the receptacle is formed by a pin projecting from a side wall of the workpiece, the lateral surface of the pin forming the contact surface.
  • the pin has a circular cross-section, that is, the pin has a cylindrical shape.
  • the clamping elements must be brought from the outside of the recording pin forming.
  • each clamping element is coupled via a deflecting element to the spherical compensating element.
  • the outer contours of the deflecting elements are adapted to the spherical compensating element, that a deflection movement is effected by the contact of the spherical compensating element with the deflecting, with which the clamping elements coupled to the deflecting elements are transferred to their clamping position upon movement of the adjusting element in the clamping position.
  • the clamping elements upon movement of the adjusting element from the clamping position into a release position, the clamping elements are transferred into their release position by a forced guidance of the clamping elements on the adjusting element and by restoring forces exerted by spring elements.
  • FIGS. 2 - 6 show a first embodiment of a clamping unit 1 for clamping a blank, which is formed in the present case of a casting 2.
  • the tensioned with the clamping unit 1 blank can be processed in a suitable manner.
  • the clamping unit 1 has two essentially identical clamping systems 5. Depending on the design of the too exciting casting 2, more than two clamping systems 5 or only one clamping system 5 can be provided.
  • clamping systems 5 Clamping of the cast part 2 takes place with the clamping systems 5, with receptacles being provided on the underside of the cast part 2 for this purpose.
  • the tensioning systems 5 themselves are mounted on a support, not shown, e.g. attached to a clamping plate 3.
  • Each clamping system 5 is seated, fastened with screws 6, on a base 5a.
  • base 5a or similar compensation segments By different base 5a or similar compensation segments, a height compensation for adaptation to the contour of the underside of the casting 2 can be done.
  • Each clamping system 5 has an upper part 7 and a lower part 8, which are fixed with other screws 9 to each other.
  • each clamping system 5 has an adjusting element 10 which can be displaced in its longitudinal direction by means of a pneumatic unit, not shown.
  • a pneumatic unit for connection to the pneumatic unit corresponding pneumatic connections 11 are provided.
  • the adjusting element 10 is formed by an elongated, substantially cylindrical part, wherein the adjusting element 10 is mounted displaced along its longitudinal axis.
  • the upper end face 10a of the adjusting element 10 forms a flat bearing surface.
  • a spherical compensating element 12 is movably mounted on this support surface.
  • the spherical compensation element 12 consists of a solid ball whose diameter is adapted to the diameter of the adjusting element 10.
  • the adjusting element 10 and the spherical compensating element 12 are assigned three identically designed clamping elements 13. On opposite side surfaces of each clamping element 13 open out cylindrical shaft segments 14 which form a pivot axis to which the clamping element 13 is pivotally mounted.
  • the shaft segments 14 of the clamping elements 13 are each mounted in corresponding rotary bearings, which are each formed in half by a segment of the upper part 7 and a segment of the lower part 8, as from the FIGS. 4 and 5 seen.
  • the pivot axes of the clamping elements 13 extend perpendicular to the longitudinal axis of the adjusting element 10.
  • a clamping element 13 a transversely of the main body protruding tip 13 a is provided.
  • the tip 13 a is used for fixing in the receptacle of the casting 2.
  • the receptacles consist of recesses 15, which open at the bottom of the casting 2.
  • the recesses 15 have a circular cross-section which is constant over the entire height of the respective recess 15.
  • the recess 15 may also be slightly conical. Also, it is not mandatory to provide a circular cross-section.
  • the recesses 15 are bounded by a cylindrical base surface of the casting 2, which form a contact surface 16.
  • each clamping element 13 is supported on a spring element 17 which is mounted in the lower part 8.
  • each clamping element 13 on a side facing the adjusting element 10 has a curvature.
  • the adjusting element 10 has a notch 10 b, which forms a stop for the lower edge of the respective clamping element 13.
  • the clamping elements 13 are pivoted by the restoring forces of the spring elements 17 in their release position.
  • the clamping elements 13 are pivoted in the direction of the adjusting element 10 such that their tips 13a do not protrude beyond the side surface of the upper part 7. In this position, the clamping elements 13, the upper part 7 of the clamping system 5 can be easily inserted into the recess 15.
  • the pivoting movements of the clamping elements 13 are predetermined by the curvatures of the individual clamping elements 13.
  • the spherical compensating element 12 is freely movable on the support surface of the adjusting element 10 and the spherical compensating element 12 is coupled to the clamping element 13 only by contact with the curved or inclined side surfaces, the spherical compensating element 12 oriented in a direction perpendicular to the longitudinal axis of the adjusting element 10 Level on the support surface perform a corresponding compensation movement. Then comes a clamping element 13 with a tip 13a in contact with the contact surface 16, the ball-shaped compensating element 12 is moved in opposite directions by the opposing force exerted thereby, whereby the other clamping elements 13 are performed with their tips 13a reinforced against the contact surface 16.
  • FIG. 5 shows the clamping element 13 in its clamping position and the adjusting element 10 in its clamping position. In this clamping position, the front edge of a clamping element 13 bears against the stop formed by the notch 10b of the adjusting elements 10.
  • the tips 13a of the clamping elements 13 are advantageously designed such that upon pressing the syringes of the contact surface 16 a force is applied downward and thus against the contact surface of the clamping system 5, whereby the hold of the casting 2 is further improved by the clamping system 5.
  • the adjusting element 10 is moved safely with the pneumatic unit in the release position, so that they 13a of the clamping elements 13 are pivoted by the restoring forces of the spring elements 17 and also by a forced operation of the clamping elements 13 on the adjusting element 10 in the upper part 7, to the clamping elements 13 in the in FIG. 4 shown release position lie.
  • the casting 2 can be released from the clamping system 5.
  • FIGS. 6 to 9 show a second embodiment of the clamping unit 1 according to the invention.
  • the receptacles of the casting 2 consist of pins 18 which project from the underside thereof.
  • the pins 18 have a constant over their height circular cross-section. In general, other cross-sectional shapes are possible, wherein the cross-section generally does not have to be constant even over the height.
  • the cylindrical outer surface of a pin 18 forms the contact surface 16th
  • the pins 18 serve as receptacles only for fastening the casting 2 and can be removed from the cast part 2 after it has been machined.
  • the embodiment differs FIGS. 6 to 9 from the embodiment of the FIGS. 2 to 5 by the implementation of the translational movement of the adjusting element 10 in the pivoting movements of the clamping elements 13, which in turn are pivotable with respect to the pivot axes defined by the shaft segments 14.
  • the spherical compensating element 12 movably mounted.
  • the adjusting element 10 is not in contact with deflecting elements 19 via the spherical compensating element 12, wherein in each case a deflecting element 19 is connected to a clamping element 13.
  • Each deflecting element 19 is displaceably mounted in the lower part 8 in the horizontal direction, that is, the deflecting elements 19 can perform translational movements perpendicular to the longitudinal axis of the adjusting element 10.
  • the first longitudinal end of a deflecting element 19 is bounded by an inclined surface 19 a, which bears against the spherical compensating element 12.
  • the other longitudinal end is located in the region below the pivot axis laterally on the clamping element 13.
  • each clamping element 13 abuts against a ball element 20, which rests on the spring element 17 performing the restoring force, the spring element 17 being positively guided in a recess of the lower part 8.
  • FIG. 8 shows the adjustment 10 in its release position, that is in its lower limit position.
  • the spherical compensation element 12 has moved downwards so far that it rests in the lower region of the inclined surface 19a of the deflection elements 19.
  • the clamping elements 13 are pivoted back into the region of the upper part 7 and held there with the restoring forces of the spring elements 17.
  • the pin 18 can be inserted in the area of the upper part 7 with the clamping elements 13, this area being in the form of a recess which opens out at the upper side of the upper part 7.
  • the diameter of this recess is adapted to the outer diameter of the pin 18, so that the pin 18 is located with a small clearance in the recess of the upper part 7.
  • the adjusting element 10 For clamping the casting 2, the adjusting element 10 is moved from the release position to the clamping position in each clamping system 5 by the pneumatic unit. As a result, the spherical compensating element 12 is pushed upwards and slides along the inclined surfaces 19a of the deflecting elements 19. By means of the contact pressure exerted by the adjusting element 10 via the spherical compensating element 12, the deflecting elements 19 are moved outwardly. As a result, the clamping elements 13 are pivoted against the restoring forces of the spring elements 17 and the tips 13 a of the clamping elements 13 are guided against the contact surface 16 of the pin 18.
  • the adjusting element 10 is retracted by the pneumatic unit back into the release position, whereby the clamping elements 13 are transferred to their release position and held there with the spring elements 17 ( FIG. 8 ). In this release position of the clamping elements 13, the pin 18 of the casting 2 can be pulled out of the recess of the upper part 7 of the clamping system 5.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)
EP18172783.5A 2017-06-08 2018-05-17 Système de serrage Active EP3412411B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017112664.3A DE102017112664B4 (de) 2017-06-08 2017-06-08 Spannsystem mit wenigstens drei Spannelementen

Publications (2)

Publication Number Publication Date
EP3412411A1 true EP3412411A1 (fr) 2018-12-12
EP3412411B1 EP3412411B1 (fr) 2021-09-22

Family

ID=62200277

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18172783.5A Active EP3412411B1 (fr) 2017-06-08 2018-05-17 Système de serrage

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EP (1) EP3412411B1 (fr)
DE (1) DE102017112664B4 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2736412A1 (de) * 1976-08-24 1978-03-02 Kennametal Inc Spannvorrichtung
EP0322617A2 (fr) * 1987-12-25 1989-07-05 Kabushiki Kaisha Kosmek Dispositif de serrage du type à cylindre
EP0913588A2 (fr) * 1997-10-31 1999-05-06 Kabushiki Kaisha Kosmek Dispositif de serrage
JP2014030892A (ja) * 2012-07-31 2014-02-20 Kosmek Ltd クランプ装置
DE202016001906U1 (de) * 2016-03-22 2016-05-09 Christof Steubing Niederzug-Zentrierspanner

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5746436A (en) * 1995-07-12 1998-05-05 Coburn Optical Industries, Inc. Air pressurized chuck
DE10338850B4 (de) * 2002-08-21 2014-01-02 Klingelnberg Gmbh Spanndorn
DE102008022826A1 (de) * 2008-05-07 2009-11-12 Röhm Gmbh Spannkopf

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2736412A1 (de) * 1976-08-24 1978-03-02 Kennametal Inc Spannvorrichtung
EP0322617A2 (fr) * 1987-12-25 1989-07-05 Kabushiki Kaisha Kosmek Dispositif de serrage du type à cylindre
EP0913588A2 (fr) * 1997-10-31 1999-05-06 Kabushiki Kaisha Kosmek Dispositif de serrage
JP2014030892A (ja) * 2012-07-31 2014-02-20 Kosmek Ltd クランプ装置
DE202016001906U1 (de) * 2016-03-22 2016-05-09 Christof Steubing Niederzug-Zentrierspanner

Also Published As

Publication number Publication date
DE102017112664A1 (de) 2018-12-13
DE102017112664B4 (de) 2021-12-16
EP3412411B1 (fr) 2021-09-22

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