WO2023025576A1 - Manchon intermédiaire - Google Patents

Manchon intermédiaire Download PDF

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Publication number
WO2023025576A1
WO2023025576A1 PCT/EP2022/072145 EP2022072145W WO2023025576A1 WO 2023025576 A1 WO2023025576 A1 WO 2023025576A1 EP 2022072145 W EP2022072145 W EP 2022072145W WO 2023025576 A1 WO2023025576 A1 WO 2023025576A1
Authority
WO
WIPO (PCT)
Prior art keywords
slot
longitudinal
weakening
slit
transverse
Prior art date
Application number
PCT/EP2022/072145
Other languages
German (de)
English (en)
Inventor
André Übele
Original Assignee
Schunk Gmbh & Co. Kg Spann- Und Greiftechnik
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 Schunk Gmbh & Co. Kg Spann- Und Greiftechnik filed Critical Schunk Gmbh & Co. Kg Spann- Und Greiftechnik
Publication of WO2023025576A1 publication Critical patent/WO2023025576A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
    • B23B31/20—Longitudinally-split sleeves, e.g. collet chucks
    • B23B31/201—Characterized by features relating primarily to remote control of the gripping means
    • B23B31/202—Details of the jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2231/00—Details of chucks, toolholder shanks or tool shanks
    • B23B2231/20—Collet chucks
    • B23B2231/2089—Slits of collets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2231/00—Details of chucks, toolholder shanks or tool shanks
    • B23B2231/20—Collet chucks
    • B23B2231/2089—Slits of collets
    • B23B2231/2097—Slits of collets having a special form not otherwise provided for

Definitions

  • the present invention relates to an intermediate sleeve for insertion into the central receptacle of a chuck, having a cylindrical sleeve body which has a central clamping bore, several longitudinal slots penetrating the wall from the outer periphery to the inner periphery being distributed in the sleeve body over its circumference, a front group of longitudinal slots extending from a front outer portion into a central portion of the sleeve body and a rear set of longitudinal slots extending from a rear outer portion of the sleeve body into a central portion of the sleeve body.
  • Chucks of the aforementioned type are known in various embodiments and are used in practice to fix a tool shank, such as a drill or milling cutter shank, to the work spindle of a corresponding machine tool.
  • a tool shank such as a drill or milling cutter shank
  • the clamping travel is very limited, so that the diameter of the receptacle on the one hand and the tool to be clamped on the other hand must be closely matched.
  • intermediate sleeves are pushed into the chuck holder in order to reduce the clamping diameter.
  • These intermediate bushes sit a cylindrical bushing body with a central clamping bore, wherein in the bushing body several longitudinal slots are formed which penetrate the wall from the outer circumference to the inner circumference and extend in the longitudinal direction of the bushing body.
  • the slits serve to give the intermediate bushing the necessary elasticity to transmit the clamping forces.
  • Such intermediate sleeves have basically proven themselves in practice. However, for accuracy when machining workpieces, it is necessary for these intermediate sleeves to be inserted into the chuck with very little play. Due to the increasing automation in the processing of workpieces, such intermediate sleeves are often automatically inserted into the receptacle of a chuck by means of a robot. Due to the small clearance between the outer diameter of the intermediate sleeve and the receptacle of the chuck, as well as between the shank of a tool and the clamping bore of the intermediate sleeve, problems can occur. On the other hand, the respective play cannot be increased at will, since otherwise the tool will not be properly clamped.
  • a tool is mainly clamped in an axially central section of the clamping bore, as a result of which an angular or positional offset of the tool axis relative to the clamping axis of the chuck can occur, so that a clamped tool wobbles.
  • the processing quality can suffer considerably as a result.
  • the object of the present invention is therefore to create an alternative intermediate sleeve, by means of which simple and trouble-free insertion into a chuck with a robot is possible and at the same time precise clamping of a tool is ensured.
  • This object is achieved with an intermediate sleeve of the type mentioned at the outset in that at least one of the two groups is assigned to each longitudinal slot at least one weakening slot structure which penetrates the wall of the sleeve body from the outer circumference to the inner circumference and includes a transverse slot which extends transversely from the assigned longitudinal slot this, in particular in the circumferential direction of the sleeve body.
  • the invention is therefore based on the idea of increasing the radial deformability of the bushing body, particularly in the axial end regions, by the targeted introduction of weakening slot structures, which include transverse slots running from the longitudinal slots. Due to the increased elasticity, a uniform clamping force can be applied to an inserted tool over the axial length of the intermediate sleeve, so that more precise clamping can be achieved. At the same time, the clearance between the intermediate sleeve and the holder of the chuck or between the intermediate sleeve and the tool shank can be increased, which means that an automated change of a tool and/or the intermediate sleeve, for example by means of a robot, is less susceptible to faults.
  • each longitudinal slit is assigned a weakening slit structure to at least one of the two groups.
  • each longitudinal slit that is to say the longitudinal slits of both groups, can also be assigned one or more weakening slit structures.
  • a weakening slit structure is not assigned to every longitudinal slit in a group, but rather only to every second or every third longitudinal slit distributed over the circumference.
  • the transverse slits of the weakening slit structures can extend, starting from the associated longitudinal slit, over a circumferential angle of at least 40°, in particular at least 45°, and/or at most 60°, in particular at most 55° in the circumferential direction of the can body.
  • the transverse slits of the weakening slit structures can extend, starting from the assigned longitudinal slit, over a circumferential angle of at least 20°, in particular at least 23°, and/or over a circumferential angle of at most 30°, in particular at most 27° in the circumferential direction of the can body.
  • Each weakening slit structure can also comprise an axial slit, which adjoins the end of the transverse slit facing away from the associated longitudinal slit and extends in the longitudinal direction of the can body, in particular parallel to the associated longitudinal slit.
  • Such an axial slot leads to a further weakening in the corresponding axial area of the bushing body and thus to increased radial deformability.
  • the weakening slot structure can have an L-shaped basic shape, with the transverse slot forming a first leg of the L and the axial slot forming a second leg of the L.
  • the axial slot it is also conceivable for the axial slot to run obliquely to the associated longitudinal slot, with the axial slot having a directional component in the axial direction.
  • the axial slots can reach through the wall of the bushing body in the direction of the axis of the clamping bore. This means that the axial slots and the respective associated longitudinal slots converge radially inward.
  • the axial slots can also extend parallel to the respective associated longitudinal slots. In this case, the distance between the axial shooters and the longitudinal shooters is constant over the entire wall of the rifle body.
  • the axial slits of the weakening slit structures can each extend over a length of at least 3 mm, in particular at least 5 mm, and/or at most 10 mm, in particular at most 8 mm. Furthermore, the axial slits of the weakening slit structures can extend over a length of at least 10% of the length of the associated longitudinal slit and/or at most 40% of the length of the associated longitudinal slit.
  • the elasticity in the axially outer sections of the intermediate sleeve is further increased by the axial slots.
  • each weakening slot structure can have a peripheral slot which is formed on the free end of the axial slot facing away from the transverse slot and which extends in the peripheral direction of the bushing body. This configuration is based on the idea of bringing about a further weakening of the material.
  • the peripheral slot can extend over twice the peripheral angle of the transverse slot and run axially outside of the longitudinal slot.
  • the circumferential slit starting from the end of the axial slit, partially covers the transverse slit in the circumferential direction and extends beyond this to the side of the longitudinal slit opposite the transverse slit.
  • Each weakening slit structure can also include a second axial slit, which adjoins the end of the circumferential slit facing away from the axial slit and extends in the longitudinal direction of the can body, in particular parallel to the associated longitudinal slit.
  • the second axial slot preferably has the same length as the first axial slot and extends over the same axial region of the bushing body.
  • each weakening slit structure can have an end slit which is formed at the free end of the axial slit remote from the transverse slit or at the free end of the second axial slit remote from the circumferential slit.
  • the end slot can extend in the circumferential direction of the socket body and point to the associated longitudinal slot. Such an end slot practically forms an extension at the end of the axial slot or at the end of the second axial slot.
  • the end slit preferably has a length of at least 1 mm and/or at most 3 mm, and/or the end slit has a length of at least 30% and/or at most 50% of the length of the transverse slit.
  • Such a configuration of the end slot results in the area enclosed by the longitudinal slot, the transverse slot and the axial slot being connected to the rest of the can body only by a material thickness remaining between the end of the end slot and the longitudinal slot. This results in a significant material weakening which leads to increased radial deformation in the corresponding sections of the bushing body when a tool is clamped.
  • the radius of the rounding is preferably about 1 mm.
  • exactly one weakening slot structure can be assigned to each longitudinal slot.
  • exactly one weakening slit structure can also be assigned to just each longitudinal slit of the front group, with the transverse slit of the weakening slit structure adjoining the axially outer end of the assigned longitudinal slit.
  • the transverse slit of the weakening slit structure can preferably connect to the axially outer end of the associated longitudinal slit.
  • the transverse slit of the weakening slit structure is arranged at the rear end of the longitudinal slit, whereas in the front group of longitudinal slits the transverse slit of the weakening slit structure is arranged at the front end of the associated longitudinal slits.
  • the axial slit of the weakening slit structure can point, starting from the transverse slit, in the direction of the central section of the can body. Accordingly, in this case the axial slot extends over the axial area of the bushing body covered by the associated longitudinal slot.
  • the axial slit of the weakening slit structure can point axially outwards, starting from the respective transverse slit. If the transverse slot connects to the axial end of the assigned longitudinal slot, then In this case, the axial slot extends over an axial area of the bushing body that is not covered by the associated longitudinal slot.
  • the transverse slits of the weakening slit structures, which are assigned to the front group of longitudinal slits, and the transverse slits of the weakening slit structures, which are assigned to the rear group of longitudinal slits can extend in opposite circumferential directions of the can body, starting from the respectively assigned longitudinal slit. This means that the transverse slits adjoining the front group of longitudinal slits point in the opposite circumferential direction compared to the transverse slits adjoining the longitudinal slits of the rear group.
  • each longitudinal slit can be assigned a first and a second weakening slit structure, with the transverse slit of the first weakening slit structure adjoining the outer end of the associated longitudinal slit and the transverse slit of the second weakening slit structure being spaced from the transverse slit in the direction of the inner section of the can body the first weakening slit structure branches off from the longitudinal slit.
  • This configuration is based on the consideration of bringing about a weakening at the respective outer ends of the longitudinal slits by arranging two weakening slit structures there.
  • the transverse slit of the first weakening slit structure and the transverse slit of the second weakening slit structure preferably extend, starting from the associated longitudinal slit, in different, in particular in opposite, circumferential directions of the can body.
  • the axial slit of the first weakening slit structure can point in the direction of the axially central section of the can body, starting from the associated transverse slit, and the axial slit of the second weakening slit structure can point axially outwards, starting from the associated transverse slit.
  • the end slit of the first weakening slit structure can have the same axial position in the can body as the transverse slit of the second weakening slit structure, and/or the end slit of the second weakening slit structure can have the same axial position in the can body as the transverse slit of the first weakening slit structure.
  • Such a configuration leads to an essentially point-symmetrical arrangement of the two weakening slot structures with respect to one another, the point of symmetry lying in the region of the associated longitudinal slot. This has proven to be particularly favorable in order to achieve the largest possible, uniform radial deformation of the intermediate sleeve when clamping a tool.
  • This embodiment of the present invention can also be designed in such a way that the two weakening slot structures are arranged opposite to the associated longitudinal slot in longitudinal slots of the same group that are adjacent in the circumferential direction of the can body.
  • the associated weakening slit structures are circumferential distributed alternately in opposite circumferential directions. The same applies to the rear group of longitudinal slots.
  • all longitudinal slots in the front group can have the same length and all longitudinal slots in the rear group can have the same length.
  • the lengths of the longitudinal slots of the front group and the rear group can differ.
  • the longitudinal slits of the front group can be longer than the longitudinal slits of the rear group, in particular by at least 10%, preferably by at least 20%, and/or in particular by at most 50%, preferably by at most 40% longer than the longitudinal slits of the rear group.
  • the intermediate bushing according to the invention can also be designed in such a way that the longitudinal slots of the rear group and the longitudinal slots of the front group are offset from one another in the circumferential direction.
  • the longitudinal slots can be offset from one another in such a way that a longitudinal slot of the rear group is always located centrally between two longitudinal slots of the front group that are adjacent in the circumferential direction.
  • longitudinal slots of the rear group and the longitudinal slots of the front group can partially overlap axially.
  • the longitudinal slits of the rear group and the front group preferably overlap over a length of at least 20%, in particular at least 30% and/or at most 60%, in particular at most 50% of the length of the longitudinal slits in the front group or the rear group.
  • an even number of longitudinal slots are provided distributed over the circumference.
  • two opposite longitudinal slots can be introduced together by wire EDM.
  • Preference is given to being distributed over the entire circumference six, eight or twelve longitudinal slots provided. With twelve longitudinal slits distributed over the circumference, this means that preferably six longitudinal slits belong to the rear group and six longitudinal slits to the front group.
  • longitudinal slots of a group that are adjacent to one another in the circumferential direction of the socket body can be offset from one another by a circumferential angle of 60°.
  • the longitudinal slits and/or the slits of the weakening slit structures preferably have a width of at least 0.2 mm and/or at most 0.4 mm. Slots with such a width can preferably be produced by means of wire EDM.
  • Each longitudinal slit can be assigned a transverse bore which passes through the wall of the bushing body from the outer circumference to the inner circumference and through which the longitudinal slit or the weakening slit structure assigned thereto runs.
  • a transverse bore can be used to introduce an eroding wire, with which the longitudinal slots and the slots of the weakening slot structures can then be produced.
  • the transverse bore can be arranged at the point of intersection of the longitudinal slots with a respectively assigned weakening slot structure. This also reduces the notch effect in the can body.
  • transverse bores at the axial end of the longitudinal slots or at the end of the end slots.
  • the transverse bore can also be provided at any other point in the longitudinal slit or in the weakening slit structure.
  • the intermediate sleeve can have an outer circular-cylindrical pressure surface for contact with a central receptacle of a chuck.
  • the longitudinal slits and the weakening slits assigned to them are preferred Structures arranged in the area of this pressure surface.
  • a circular-cylindrical peripheral surface is provided, which is brought into contact with a receptacle of a chuck and via which radial pressure can be applied by the chuck to the intermediate sleeve in order to positively fix a tool inserted into the clamping bore.
  • the pressure surface can be delimited at the front by a stop projection that runs around in the form of a ring.
  • an annular circumferential puncture groove can be formed in the pressure surface adjacent to the stop projection. This allows grinding tools to run out adjacent to the ring-shaped circumferential stop projection.
  • the transverse slits of weakening slit structures which are assigned to the front group of longitudinal slits, are preferably located in the axial area of the annular circumferential puncture groove. These are, in particular, the weakening slit structures whose transverse slits emanate from the front end of the associated longitudinal slit.
  • the front end of the intermediate sleeve can taper conically, with at least part of the respective weakening slot structures, which are assigned to the front group of longitudinal slots, preferably being arranged in the region of this conical taper.
  • a transition chamfer may be formed at the rear end of the pressure surface to facilitate insertion into a socket of a chuck.
  • locking means can be provided in a rear area of the sleeve body. These locking means can be used in particular for positive locking and can comprise at least one, preferably two circumferentially opposite recesses which extend from the rear end face of the socket body into the socket body and preferably pass through the wall of the socket body from the outer circumference to the inner circumference.
  • the recesses can be L-shaped and include a first L-leg open to the rear and a second L-leg extending in the circumferential direction, so that the intermediate sleeve can be positively locked in the receptacle of a chuck by means of a suitable positive-locking element.
  • the second leg of the L is preferably arranged in an outer annular groove of the bushing body.
  • wrench flats can be formed on a front end section of the sleeve body.
  • a tool for example an open-end wrench, can be used to turn the intermediate sleeve in the receptacle of a chuck.
  • FIG. 1 shows a perspective view of a first embodiment of an intermediate sleeve according to the invention
  • FIG. 2 shows the intermediate sleeve from FIG. 1 in a side view
  • FIG. 3 shows the intermediate sleeve from FIG. 1 in a longitudinal sectional view
  • FIG. 4 shows a second embodiment of an intermediate sleeve according to the invention in a perspective view
  • FIG. 5 shows the intermediate sleeve from FIG. 4 in a side view
  • FIG. 6 shows the intermediate bush from FIG. 4 in a longitudinal sectional view
  • FIG. 7 is a perspective view of a third embodiment of an intermediate sleeve according to the present invention.
  • FIG. 8 shows the intermediate sleeve from FIG. 7 in a side view
  • FIG. 9 shows the intermediate bush from FIG. 7 in a longitudinal sectional view
  • FIG. 10 is a perspective view of a fourth embodiment of an intermediate sleeve according to the invention.
  • FIG. 11 shows the intermediate sleeve from FIG. 10 in a side view
  • FIG. 12 shows a perspective view of a fifth embodiment of an intermediate sleeve according to the invention.
  • FIG. 13 shows the intermediate sleeve from FIG. 12 in a side view
  • FIG. 14 shows the intermediate sleeve from FIG. 12 in a longitudinal sectional view.
  • Figures 1 to 3 show a first embodiment of an intermediate sleeve 1 according to the invention for insertion into the central receptacle of a chuck.
  • the intermediate sleeve 1 has a cylindrical sleeve body 2, which has a central clamping bore 3 for receiving a tool shank.
  • the bushing body 2 also has an outer circular-cylindrical pressure surface 4 for contact on the inside with the central receptacle of a chuck. This is delimited on a front side by a ring-shaped circumferential stop projection 5 , adjacent to which a ring-shaped circumferential puncture groove 6 is formed in the pressure surface 4 .
  • a transition chamfer 7 is formed at the rear axial end of the pressure surface 4, which simplifies the introduction into a receptacle of a chuck.
  • the transition bevel 7 is inclined at an angle of approximately 10° to the pressure surface 4 .
  • locking means are provided at the rear axial end of the bushing body 2, by means of which the intermediate bushing 1 can be held positively in the receptacle of a chuck.
  • the locking means comprise two mutually opposite recesses 8 over the circumference of the bushing body, which extend from the rear face of the bushing body 2 into the latter and completely penetrate the wall of the bushing body 2 from the outer circumference to the inner circumference.
  • the two recesses 8 are L-shaped and comprise a first, rearwardly open leg 9 of the L and a second leg 10 of the L, which extends in the circumferential direction of the sleeve body 2 and is arranged in an outer annular groove 11 of the sleeve body 2 .
  • a total of twelve longitudinal slots 13 extending through the wall from the outer circumference to the inner circumference are formed in the bushing body 2, distributed over its circumference.
  • a front group of a total of six longitudinal slots 13a which are arranged on the right in FIGS. 2 and 3, extends from a front outer section into a central section of the can body 2.
  • a rear group, arranged on the left in FIGS of a total of six longitudinal slits 13b extends from a rear portion of the can body 2 into a central portion of the can body 2.
  • the longitudinal slits 13a of the front group are longer by about 10% than the longitudinal slits 13b of the rear group and are each offset in the circumferential direction by 30° arranged in the longitudinal slots 13b of the rear group.
  • the longitudinal slots 13a of the front group and the longitudinal slots 13b of the rear group partially overlap axially over a length of about 30% of the length of the longitudinal slots 13b of the rear group.
  • Each longitudinal slot 13 is assigned a transverse bore 14 which penetrates the wall of the bushing body 2 from the outer circumference to the inner circumference and through which the longitudinal slot 13 runs.
  • a transverse bore simplifies the production of the socket body 2, since an erosion wire can be introduced through it, by means of which the longitudinal slots 13a, 13b can be produced.
  • each longitudinal slit 13 is assigned a weakening slit structure 15 which penetrates the wall of the can body 2 from the outer circumference to the inner circumference.
  • Each weakening slit structure 15 comprises a transverse slit 16 extending from the associated longitudinal slit 13a, 13b extends in the circumferential direction of the sleeve body 2.
  • the transverse slots 16 extend, starting from the respective axially outer ends of the associated longitudinal slots 13, over a circumferential angle of the bush body 2 of approximately 50°.
  • the transverse slots 16 associated with the longitudinal slots 13a of the front group extend in the opposite circumferential direction of the can body 2 as do the transverse slots 16 associated with the longitudinal slots 13b of the rear group.
  • the transition from the longitudinal slots 13 to the respective transverse slots 16 is rounded with a radius of about 1 mm.
  • Each weakening slit structure 15 also includes an axial slit 17 which adjoins the end of the transverse slit 16 facing away from the associated longitudinal slit 13 and extends parallel to the associated longitudinal slit 13 in the longitudinal direction of the can body.
  • the axial slots 17 each point, starting from the respective transverse slot 16, in the direction of the central section of the can body 2. This means that the axial slots 17, which are assigned to the longitudinal slots 13a of the front group, point to the left in Figure 2, while the axial slots 17 , which are assigned to the longitudinal slots 13b of the rear group, point to the right in FIG.
  • the transition between the transverse slots 16 and the axial slots 17 is also provided with a corresponding rounding with a radius of about 1 mm.
  • the axial slots 17 presently have a length of 6 mm insofar as they are associated with the longitudinal slots 13b of the rear group and a length of 5 mm insofar as they are associated with the longitudinal slots 13a of the front group.
  • each weakening slot structure 15 comprises an end slot 18 which is formed at the free end of the axial slot 17 facing away from the respective transverse slot 16 .
  • the end slot 18 extends in In the present case, the end slot 18 has a length of 1.5 mm, the transition between the end slot 18 and the axial slot 17 also being rounded off with a radius of about 1 mm.
  • greater play can be provided between the intermediate sleeve 1 and the receptacle or between the clamping bore 3 and a tool shank than in the case of intermediate sleeves without such weakening slot structures.
  • due to the increased elasticity a uniform clamping force can be generated over the axial length of the bushing body 2, so that a tool can be clamped precisely.
  • FIGS. 4 to 6 show a second embodiment of an intermediate sleeve 1 according to the present invention.
  • this is constructed similarly to the embodiment shown in FIGS. 1 to 3, but is intended for clamping tools with a smaller shank diameter.
  • the wall of the socket body 2 between the outer circumference and the inner circumference is made significantly thicker in a front clamping section 19, as can be seen in FIG.
  • the clamping bore 3 is widened.
  • the arrangement of the longitudinal slits 13 and the weakening slit structures 15 is in principle similar to the embodiment in FIGS. ment slot structures 15 adjusted.
  • the longitudinal slots 13 are concentrated towards the front section of the can body 2 .
  • the rear group longitudinal slots 13b extend into the front clamping portion 19 from an axial position axially rearward thereof.
  • the longitudinal slots of the front group 13a run completely axially within the front clamping area 19.
  • FIGS. 7 to 9 show a third embodiment of an intermediate sleeve 1 according to the invention. This differs from the embodiments shown in FIGS. 1 to 3 in that each longitudinal slot 13 is assigned not one but two weakening slot structures 15a, 15b.
  • a first weakening slit structure 15a comprises a transverse slit 16a which, starting from the axial outer end of the associated longitudinal slit 13, extends in the circumferential direction of the can body over a circumferential angle of approximately 25°.
  • This transverse slot 16a is followed by an axial slot 17a which extends parallel to the associated longitudinal slot 13 .
  • the first weakening slit structure 15a also has an end slit 18a which extends in the circumferential direction of the can body and faces the associated longitudinal slit 13 .
  • the length of the end slot 18a corresponds to approximately 50% of the length of the transverse slot 16a.
  • the first weakening slot structure 15a is thus constructed in a similar way to the weakening slot structure 15 of the first embodiment, but the transverse slot 16a extends over a significantly smaller circumferential angle of the bush body 2.
  • a second weakening slit structure 15b is point-symmetrical to the first weakening slit structure, as can be seen in particular in FIG.
  • the transverse slit 16b of the second weakening slit structure 15b runs from the transverse bore 14 of the respective longitudinal slit 13 into the transverse slit 16a of the first weakening slit structure.
  • Structure 15a opposite circumferential direction of the sleeve body 2.
  • the transverse slot 16b of the weakening slot structure 15b is followed by an axial slot 17b which points axially outwards.
  • the axial slot 17b is in turn adjoined by an end slot 18b which extends in the circumferential direction and points towards the associated longitudinal slot 13 .
  • This end slot 18b also has a length of approximately 50% of the length of the transverse slot 16b.
  • the two weakening slot structures 15a, 15b are arranged in such a way that the transverse slot 16a of the first weakening slot structure 15a has the same axial position on the can body as the end slot 18b of the second weakening slot structure. Likewise, the end slit 18a of the first weakening slit structure 15a and the transverse slit 16b of the second weakening slit structure 15b have the same axial position on the can body.
  • the weakening slit structures 15a, 15b at respective adjacent elongate slits 13a, 13b of each group of elongate slits 13 are oppositely arranged in the circumferential direction of the can body 2. As shown in FIG. In concrete terms, this means that the first weakening slit structure 15a of a longitudinal slit 13a of the front group extends from this in the opposite circumferential direction of the can body as the first weakening slit structure 15a of the circumferentially adjacent longitudinal slit 13a of the front group.
  • the weakening slit structures 15a, 15b, which are assigned to a group of longitudinal slits 13a, 13b, are arranged alternately over the circumference, in each case opposite one another.
  • This design of the weakening slot structures 15a, 15b also increases the deformability of the intermediate bushing 1 when clamping a tool allows.
  • a weakening takes place predominantly in the axial end areas of the intermediate sleeve 1, so that a precise clamping of a tool without an angular offset is also possible in these sections.
  • this allows the insertion play of the intermediate sleeve 1 into the receptacle of a chuck to be increased. In this way, the susceptibility to failure when the intermediate sleeve 1 is introduced by means of a robot is reduced.
  • FIGS. 10 and 11 show a further embodiment of an intermediate sleeve 1 according to the invention. This differs from the previous embodiments in particular with regard to the respective weakening slot structure 15 which is assigned to all of the longitudinal slots 13 in each case.
  • a transverse slot 16 Starting from the axially outer ends of the respective longitudinal slot 13, where the transverse bore 14 is also arranged, a transverse slot 16 extends over a circumferential angle of approximately 25°.
  • the transverse slots 16 of the front group of longitudinal slots 13a extend from the respective longitudinal slot 13 in the opposite circumferential direction of the can body 2 to the transverse slots 16 assigned to the longitudinal slots 13b of the rear group.
  • Each weakening slit structure 15 also includes an axial slit, which adjoins the end of the respective transverse slit 16 that faces away from the associated longitudinal slit 13 .
  • the axial slots 17 extend in the longitudinal direction of the socket body 2, in this case parallel to the associated longitudinal slot 13. Starting from the respective transverse slot 16, the axial slots 17 extend axially outwards in the socket body 2, i.e. they are located in a section lying outside the axial region of the longitudinal slot of the can body 2.
  • Each weakening slot structure 15 also includes a circumferential slot 20 which is formed on the free end of the axial slot 17 facing away from the transverse slot 16 and extends in the circumferential direction of the bushing body 2 over twice the circumferential angle of the transverse slot 16 . In other words, the circumferential slots 20 are each located axially outside of the associated transverse slot 16.
  • a second axial slot 21 adjoins the end of the circumferential slot 20 applied from the axial slot 17 in the longitudinal direction of the bushing body 2 .
  • this has the same length as the axial slot 17 and extends over the same axial area of the bushing body 2.
  • each weakening slot structure 15 has an end slot 18 which is formed at the free end of the second axial slot 21 facing away from the circumferential slot 20 .
  • the end slot 18 extends in the circumferential direction of the socket body 2 and points towards the associated longitudinal slot 13.
  • Figures 12 to 14 show a further embodiment of an intermediate sleeve 1 according to the invention. This differs in terms of its outer contour from the previous embodiments in that the front end of the intermediate sleeve 1 tapers conically.
  • a conical annular surface 22 is inclined at an angle of about 30° to the axis of the central clamping bore 3 .
  • a plurality of longitudinal slots 13 extending through the wall from the outer circumference to the inner circumference are formed over the circumference of the can body 2 . These are divided into a front group of longitudinal slots 13a and a rear group of longitudinal slots 13b. The longitudinal slots 13b of the rear group extend starting from a transverse hole tion 14 to the front. No weakening slot structure 15 is assigned to them.
  • the longitudinal slots 13a of the front group extend backwards from the conical annular surface 22 in the can body 2 .
  • Each longitudinal slit 13a of the front group is assigned a weakening slit structure 15, which comprises a transverse slit 16 adjoining the front end of the respective longitudinal slit 13a, which extends from the assigned longitudinal slit 13a in the circumferential direction of the can body 2 over a circumferential angle of approximately 50°.
  • This transverse slot 16 is adjoined by an axial slot 17 which extends parallel to the associated longitudinal slot 13a.
  • Each weakening slot structure 15 also includes an end slot 18 which is formed at the free end of the axial slot 17 facing away from the transverse slot and which extends in the circumferential direction of the bush body 2 .
  • the end slot 18 to the associated longitudinal slot 13a.
  • This configuration of the weakening slot structures 15 also leads to increased radial deformation.
  • increased deformability is achieved, so that the clearance between the intermediate sleeve 1 and the location of a chuck or between the intermediate sleeve 1 and a tool shank to be clamped can be increased while at the same time increasing quality of clamping. In this way, the susceptibility to failure when the intermediate sleeve 1 is introduced by means of a robot is reduced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
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Abstract

Manchon intermédiaire (1) à insérer dans le réceptacle central d'un mandrin, comprenant un corps de manchon cylindrique (2) qui présente un alésage de serrage central (3), une pluralité de fentes longitudinales (13), qui traversent la paroi de la circonférence extérieure à la circonférence intérieure, étant formées dans le corps de manchon (2) de manière à être réparties sur la circonférence de celui-ci, un groupe avant de fentes longitudinales (13a) s'étendant depuis une partie externe avant dans une partie centrale du corps de manchon (2), et un groupe arrière de fentes longitudinales (13b) s'étendant depuis une partie externe arrière du corps de manchon (2) dans une partie centrale du corps de manchon (2), chaque fente longitudinale (13) d'au moins un des deux groupes étant associée à au moins une structure de fente d'affaiblissement (15, 15a, 15b) qui traverse la paroi du corps de manchon (2) entre la circonférence extérieure et la périphérie intérieure et présente une fente transversale qui, depuis la fente longitudinale associée (13), s'étend transversalement à celle-ci, en particulier dans la direction circonférentielle du corps de manchon (2).
PCT/EP2022/072145 2021-08-26 2022-08-05 Manchon intermédiaire WO2023025576A1 (fr)

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JP2001170809A (ja) * 1999-12-16 2001-06-26 Citizen Watch Co Ltd 棒材支持装置及び自動旋盤
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DE202011004231U1 (de) 2010-03-19 2011-08-11 Schunk Gmbh & Co. Kg Spann- Und Greiftechnik Zwischenbüchse
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US20170341158A1 (en) * 2016-05-31 2017-11-30 Ching-Ting Chen Holding sleeve of a knife holder

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DE8111078U1 (de) 1981-04-11 1981-08-20 Wilhelm Hainbuch GmbH u. Co Präzisions-Spannwerkzeugfabrik, 7142 Marbach Spannzange
DE102011052747A1 (de) 2011-08-16 2013-02-21 EMUGE-Werk Richard Glimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge Spannelement für eine Spannvorrichtung
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Publication number Priority date Publication date Assignee Title
SU859036A1 (ru) * 1979-12-06 1979-12-06 Предприятие П/Я В-2309 Зажимна цанга
US6280126B1 (en) * 1999-09-23 2001-08-28 Aesop, Inc. Damped tool holder and method
JP2001170809A (ja) * 1999-12-16 2001-06-26 Citizen Watch Co Ltd 棒材支持装置及び自動旋盤
DE202011004231U1 (de) 2010-03-19 2011-08-11 Schunk Gmbh & Co. Kg Spann- Und Greiftechnik Zwischenbüchse
DE202011051001U1 (de) * 2011-08-16 2012-08-21 EMUGE-Werk Richard Glimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge Spannelement für eine Spannvorrichtung
US20170341158A1 (en) * 2016-05-31 2017-11-30 Ching-Ting Chen Holding sleeve of a knife holder
KR101682125B1 (ko) * 2016-08-22 2016-12-02 주식회사 원진에이앤티 공작물 장착용 척 구조체

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