WO2018073265A1 - Dispositif de serrage extensible hydraulique - Google Patents

Dispositif de serrage extensible hydraulique Download PDF

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Publication number
WO2018073265A1
WO2018073265A1 PCT/EP2017/076515 EP2017076515W WO2018073265A1 WO 2018073265 A1 WO2018073265 A1 WO 2018073265A1 EP 2017076515 W EP2017076515 W EP 2017076515W WO 2018073265 A1 WO2018073265 A1 WO 2018073265A1
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WO
WIPO (PCT)
Prior art keywords
clamping
pressure chambers
receptacle
wall
component
Prior art date
Application number
PCT/EP2017/076515
Other languages
German (de)
English (en)
Inventor
Michael Haag
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
Priority to EP17793598.8A priority Critical patent/EP3525969A1/fr
Publication of WO2018073265A1 publication Critical patent/WO2018073265A1/fr

Links

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
    • B23B31/24—Chucks characterised by features relating primarily to remote control of the gripping means
    • B23B31/30—Chucks characterised by features relating primarily to remote control of the gripping means using fluid-pressure means in the chuck
    • B23B31/305—Chucks characterised by features relating primarily to remote control of the gripping means using fluid-pressure means in the chuck the gripping means is a deformable sleeve
    • 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
    • B23B31/204—Characterized by features relating primarily to remote control of the gripping means using fluid-pressure means to actuate the gripping means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for 
    • B23P11/02—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for  by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
    • F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
    • F16D1/0805—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to deformation of a resilient body or a body of fluid
    • 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
    • B23B2231/04—Adapters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2260/00—Details of constructional elements
    • B23B2260/026—Bushings, e.g. adapter sleeves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B2200/00—Constructional details of connections not covered for in other groups of this subclass
    • F16B2200/89—Use of a hydraulic action

Definitions

  • the present invention relates to a hydraulic expansion chuck device, designed as a stretch chuck, in particular for fixing a component or tool to a machine tool or a work table, with a basic body defining a clamping axis, at the front end region of which a central receptacle is open towards the front end face of the main body.
  • a component to be clamped is axially slidable, wherein the receptacle defines an axial clamping section and the wall of the receptacle in the region of the clamping section is hydraulically elastically deformable inwardly to fix a frictionally engaged in the receiving component gebobe- nes.
  • the present invention relates to a hydraulic Dehnspann leverage, which is designed as Dehnspanndorn, in particular for fixing a component or tool on a machine tool or a work table, with a clamping axis defining base body on which a clamping portion is formed, on which a component to be pushed pushed is, wherein the wall of the clamping portion is hydraulically elastically deformed outwardly to fix a pushed onto the clamping portion component frictionally.
  • the present invention relates to an intermediate bushing usable with a chuck or a chuck according to the present invention for changing the active chucking diameter of the chuck.
  • Such hydraulic expansion chucks - also known as hydraulic chucks - are known in the prior art in different configurations and serve to fix tools or components to be machined on a machine tool.
  • the known hydraulic expansion chucks usually comprise a base body defining a chuck or chuck axis, and an expansion sleeve which is inserted into the base body to form a pressure chamber surrounding the expansion sleeve and pressurizable with a hydraulic medium and a central one open to the front face of the base body Recording forms, in which a too exciting tool shank can be inserted.
  • the wall between the pressure chamber and the receptacle is formed so thin and elastic that it is elastically deformable inwardly by an increase in pressure in the pressure chamber to fix a tool shank used in the recording frictionally.
  • the clamping section is provided on the outside of the base body and is formed by a usually cylindrical clamping surface.
  • an annular pressure chamber is formed, wherein the wall between the clamping surface and the pressure chamber is formed elastically so that it is elastically deformable by an increase in pressure in the pressure chamber to the outside to fix a force applied to the clamping surface component.
  • the known Dehnspann drivingen have a defined clamping diameter, so that only components can be clamped, which have a corresponding to exciting diameter.
  • the diameter of the receptacle in the case of a stretch chuck must correspond to the diameter of the shank to be clamped in such a way that the shank can be inserted into the receptacle and tensioned by the elastic deformation of the stretch bush when the pressure chamber is acted upon.
  • the clamping diameter must correspond to the inside diameter of a component to be clamped.
  • Such intermediate sleeve has a barrel body cylindrical basic shape.
  • the sleeve body defines a central clamping bore whose diameter corresponds to the shaft diameter of the tool to be clamped.
  • the outer diameter of the sleeve body is dimensioned to be insertable into the receptacle of the chuck and to deform the tightening portion of the sleeve body radially inward when the pressure chamber of the expansion chuck is pressurized.
  • the can body is formed in such a way that it can be pushed onto the clamping region of a hydraulic Dehnspanndorns and can be tensioned by this.
  • a clamping surface on the outside of the elastically deformable Formed clamping portion of the sleeve body is formed in such a way that it can be pushed onto the clamping region of a hydraulic Dehnspanndorns and can be tensioned by this.
  • the outer diameter of the Dehnspanndorns in the region of the clamping surface and the inner diameter of the intermediate sleeve are chosen so that the sleeve body comes with its clamping portion on the clamping surface of Dehnspann- mandrel in abutment, so that the clamping portion of the intermediate sleeve is deformed radially outward when the Pressure chamber of the expansion mandrel is pressurized.
  • the sleeve bodies generally have a plurality of slots extending in the longitudinal direction of the sleeve body, which slots can extend in particular from the outer circumference of the inner circumference of the sleeve body.
  • Object of the present invention is to provide a hydraulic Dehnspannein- device of the type mentioned in such a way that it can be used flexibly.
  • This object is achieved in a trained as a chuck hydraulic Dehnspann thanks of the type mentioned above in that the recording of several - especially exactly two, three or four - hydraulically acted upon pressure chambers is surrounded, evenly distributed along the circumference of the recording and in particular are formed concentrically to the clamping axis, and that radially located between the inner surface of the receptacle and the pressure chambers located wall regions are formed so elastically that they are by a Increasing the hydraulic pressure in the pressure chambers are elastically deformable inwardly to fix a component inserted into the receptacle frictionally.
  • the object is achieved according to the invention in a hydraulic expansion chuck designed as a tensioning mandrel of the type mentioned above in that a plurality of - in particular exactly two, three or four - hydraulically loadable pressure chambers are formed in the expansion mandrel of the wall of the clamping portion, evenly distributed arranged along the circumference of the clamping portion and in particular are formed concentrically to the clamping axis, and that the radially located between the outer surface of the clamping portion and the pressure chambers wall portions is formed so elastically that they are elastically deformable by an increase in the hydraulic pressure in the pressure chambers inwardly to fix a pushed onto the clamping portion component frictionally.
  • the invention is therefore based on the consideration, Dehnspann wornen not see how to provide in the prior art with an annular pressure chamber over which the clamping portion is uniformly pressurized along its entire circumference with pressure, but rather several offset in the circumferential direction and spaced from each other Provide pressure chambers through which the wall of the clamping portion only locally in those peripheral regions over which the pressure chambers extend, is deformed. This creates the opportunity to load the component only locally, if desired.
  • the individual pressure chambers are preferably connected to one another via connection channels, so that they can be pressurized together.
  • three pressure chambers may be provided with an angular offset of 120 ° in the circumferential direction.
  • the pressure chambers each extend over a circumferential region of 30 ° to 60 °, in particular of about 50 °.
  • the base body with the pressure chambers is at least partially produced in a generative manufacturing process.
  • the wall of the clamping portion over its entire axial length by recesses which extend in the longitudinal direction and in particular in the axial direction and which are preferably formed as radial longitudinal slots, forming circumferentially between the recesses Clamping areas over which a component is stretched, is segmented. Due to the segmentation, the wall of the clamping section can be deformed more easily than a closed wall.
  • clamping surface portions are then formed, which come into contact with the component to be clamped.
  • These can be adapted to the shape of a component to be clamped.
  • the clamping surface sections are preferably also formed in the shape of a circle segment.
  • the clamping regions may each carry a particular radial retaining projection, on which a clamping surface portion is formed, which comes into contact with the component to be clamped.
  • the contours of the clamping portion can otherwise be selected independently of the shape of the component to be clamped.
  • pressurization of the pressure chambers thus causes the wall of the clamping section to be deformed outwardly in the area of the pressure chambers and outwards in the areas located therebetween.
  • an application of the pressure chambers leads to an outward deformation of lying in the region of the pressure chambers Wandungsabête, in the areas between the pressure chambers nen areas, however, to an inwardly directed deformation.
  • the wall sections are elastically deformed in the opposite direction. With appropriate design of the clamping sections, this reverse deformation can be used to clamp a component passive.
  • the actual clamping process does not take place locally in the area of the pressure chambers, as with the active voltage instead, but locally in the peripheral areas located between the pressure chambers.
  • each pressure chamber may be associated with a recess which is positioned centrally of the pressure chamber in the circumferential direction, so that formed by the segmentation between the recesses or radial longitudinal slots clamping areas that are formed between the pressure chambers lie. If an active voltage is to take place, the recesses lie centrally between the pressure chambers in the circumferential direction.
  • each pressure chamber may be associated with a cavity which extends over the axial length of the clamping portion radially between the pressure chamber and the clamping surface in the circumferential direction and in particular is connected by the pressure chamber associated with the recess clamping surface.
  • the cavities are positioned in the circumferential direction in each case centrally of the associated pressure chamber or in the circumferential direction in each case centrally between the cavities, preferably extend over a larger peripheral region than the pressure chambers.
  • the cavities may be formed as peripheral slots and / or run concentrically to the clamping axis.
  • cavities can be formed in the base body, viewed in the circumferential direction, between the pressure chamber, which extend in the circumferential direction and, in particular, extend concentrically with respect to the clamping axis.
  • the cavities can be formed as peripheral slots.
  • the in Circumferentially circumferential ends of the circumferential slots connect end slots which surround the ends of the pressure chambers arcuate.
  • the cavities lie radially outside the cavities and the end slots extend outward from the circumferential slots.
  • the cavities lie radially inside the cavities and the end slots extend inwards.
  • Tribos- or Tri- bos mini-technology in the inclusion of a Dehnspannfutters use an intermediate sleeve having a central clamping bore for a component to be clamped, wherein the outer surface of the intermediate sleeve is formed such that the Intermediate bushing rests on the inside of the receptacle only in the circumferential regions corresponding to the pressure chambers, but is spaced from the wall of the receptacle in the intermediate circumferential regions, so that the intermediate bushing is elastically inward only in the contact regions when the pressure increases in the pressure chambers the intermediate circumferential regions is elastically deformed outwards, and is elastically deformed back to its original shape at a pressure relief of the pressure chambers.
  • an intermediate sleeve can be pushed onto the clamping portion of a mandrel, on the outside of which a component is clamped, wherein the inner surface of the intermediate sleeve is formed such that it rests on the outside of the wall of the clamping portion only in the peripheral areas corresponding to the pressure chambers, in the intermediate Peripheral areas, however, is spaced from the wall, so that the intermediate sleeve elastically outwardly at an increase in pressure in the pressure chambers only in the contact areas, but in the lying between the investment areas peripheral areas is deformed inside, and is elastically deformed back to its original shape at a pressure relief of the pressure chambers.
  • a passive voltage according to the Tribos technology can be realized by the use of an intermediate sleeve.
  • the use of an intermediate sleeve also has the advantage that with a single expansion chuck over the use of intermediate sleeves with different clamping diameters different sized components can be stretched.
  • cavities may be formed in the body, which extend in the circumferential direction and in particular extend concentrically to the clamping axis. These can be designed as circumferential slots in the manner already described, with end slots then expediently adjoining the circumferential slots of the circumferential slots, which in particular enclose the ends of the pressure chambers in an arcuate manner.
  • the intermediate bushings can be segmented by corresponding axial recesses or longitudinal slots in the region of the inner or outer surface coming into contact with the component to be clamped.
  • cavities may be formed, which are connected via the longitudinal slots with the exciting inner or outer surface of the intermediate sleeve, as is known from the Tribos mini-technology.
  • they are in the subclaims 3 to 12 provided under protection embodiments of the inner contour of a chuck or the outer contour of a mandrel on the embodiment of an intermediate sleeve transferable.
  • the intermediate bushings may be formed according to the subclaims 14, 15 and 17 and 18, respectively.
  • expansion devices can also be used which have a pressure chamber extending annularly along the tension surface.
  • the wall of the clamping section is then elastically deformed inwardly or outwardly over the entire handling, but the deformation also leads to a corresponding deformation of the intermediate sleeve only in the region of the contact surface.
  • a hydraulic Dehnspann issued formed as Dehnspannfutter in particular for fixing a component or tool on a machine tool or a work table, with a clamping axis defining base body, at its front end portion to the front end face of the body towards open central Receiving is formed, in which a component to be clamped axially slidably, wherein the receptacle defines an axial clamping portion with a clamping surface and the wall of the receptacle in the region of the clamping portion is elastically elastically deformable inwardly to fix a pushed into the receptacle member frictionally , wherein the receptacle is surrounded in a ring shape by a hydraulically actuable pressure chamber, which in particular is congruent.
  • the Dehnspann worn which is characterized in that in the receptacle an intermediate sleeve is used which has a central clamping bore for a component to be clamped, wherein the outer surface of the intermediate sleeve is formed such that the intermediate sleeve only in several - in particular exactly in two, three or four - defined, in the circumferential direction, in particular uniformly spaced contact areas on the wall of the receptacle inside abuts, but is spaced in the intermediate peripheral regions of the wall of the receptacle, so that the intermediate sleeve at an increase in pressure in the pressure chamber
  • elastically outwardly deformed only in the contact areas in the intermediate peripheral regions and is elastically deformed back to its original position at a pressure relief of the pressure chamber.
  • a hydraulic Dehnspannraum configured as Dehnspanndorn, in particular for fixing a component or tool on a machine tool or a work table, with a clamping axis defining base body on which a clamping portion is formed with a clamping surface on which a component to be clamped can be pushed, wherein the wall of the body in the region of the clamping portion is hydraulically elastically deformed outwardly to frictionally fix a pushed onto the clamping member, wherein in the main body on the inside of the clamping portion a hydraulically loadable pressure chamber is formed, the ringför- mig extends along the circumference of the clamping portion and is formed in particular concentric to the clamping axis, wherein the Dehnspanndorn is characterized in that on the clamping portion an intermediate sleeve is pushed, on the outside of a component spa fun nnbar, wherein the inner surface of the intermediate sleeve is formed such that it only in several - especially in exactly
  • FIG. 1 shows a side view of a hydraulic expansion chuck designed as a chuck according to a first embodiment of the present invention
  • Figure 2 shows the hydraulic Dehnspann raised of Figure 1 in section along the line B-B;
  • Figure 3 is a side view of a hydraulic chuck formed as a chuck according to a second embodiment of the present invention; the hydraulic Dehnspann driving of Figure 3 in section along the line BB; the Dehnspann servicing of Figure 3 in longitudinal section; the Dehnspann listening of Figure 3 in front view; a side view of a formed as a chuck hydraulic Dehnspann listening according to a third embodiment of the present invention; the expansion chuck of Figure 7 along the line BB in Figure 7; the hydraulic Dehnspann listening of Figure 7 in front view; the Dehnspann listening of Figure 7 in longitudinal section; a side view of a designed as a chuck hydraulic Dehnspann driving with an intermediate sleeve according to a fourth embodiment of the present invention; the hydraulic Dehnspann coupled of Figure 1 1 in section along the line DD of Figure 1 1; a corresponding to the fourth embodiment variant of a trained as a chuck hydraulic Dehnspannrios; a side view of a formed as a mandrel hydraulic Dehnspann superior
  • FIG. 24 shows a variant of a hydraulic expansion chuck designed as a mandrel, corresponding to the seventh embodiment.
  • Figures 1 and 2 show a hydraulic Dehnspann adopted for clamping a component, in particular a tool shank, according to a first embodiment of the present invention.
  • the hydraulic expansion chuck 1 is designed here as a chuck and comprises a base body 2, which defines a clamping or chuck axis X. At its left end region in FIG. 1, the base body 2 has a machine interface in the form of a clamping flange 2 a for attachment to a machine tool.
  • a total of three evenly distributed along the circumference axial through holes 3 are formed, via which the Dehnspann engaged 1 can be screwed to a work or machine table.
  • a central receptacle 5 is formed, which defines a clamping portion with a clamping surface and into which a part to be clamped can be inserted.
  • the receptacle 5 is surrounded by a total of three pressure chambers 6, which extend over the axial length of the clamping portion.
  • the pressure chambers 6 are formed with an angular offset of 120 ° in the base body 2 and each extend over a circumferential region of about 50 °. They can be acted upon with a hydraulic medium to elastically deform the wall 7 between the central receptacle 5 and the pressure chambers 6 inwards and thus fix a component inserted into the receptacle 5 in a force-fitting manner.
  • located between the receptacle 5 and the pressure chamber 6 sections of the wall 7 are correspondingly thin and elastic.
  • To pressurize the pressure chambers 6 are connected to each other via connecting channels 8 and are connected via a trained in Grundköper 2 hydraulic line 9 with a central source of hydraulic fluid in combination.
  • the entire system with the pressure chambers 6, the connecting channels 8 and the hydraulic medium line 9 are filled in a conventional manner with a hydraulic fluid such as oil.
  • FIGS. 3 and 4 show a second embodiment of a hydraulic tensioning device 1 according to the present invention designed as a chuck.
  • This has the same basic structure as the first embodiment with a base body 2 which is fixable to a machine tool via a clamping flange 2a, and to the front end face 4 of the main body 2 open towards the central receptacle 5, in which a component to be clamped can be inserted.
  • the receptacle 5 is surrounded by a total of three pressure chambers 6, which can be acted upon hydraulically in order to elastically deform the wall sections of the clamping section located between the receptacle 5 and the pressure chambers 6.
  • a passively exciting system is provided, which spans accordingly when the pressure chambers 6 are pressure relieved.
  • each pressure chamber 6 is associated with a longitudinal slot 10 which is positioned centrally of the pressure chamber 6 in the circumferential direction. Between the three radial longitudinal slots 10 clamping regions 1 1 are defined, over which a component is tensioned.
  • the clamping areas each carry a radial retaining projection 12 on which a clamping surface portion is formed.
  • each pressure chamber 6 is associated with a cavity 13 in the form of a concentric with the clamping axis X extending circumferential slot which extends over the axial length of the clamping portion between the pressure chamber 6 and the clamping surface in the circumferential direction.
  • the circumferential slots 13 are positioned in the circumferential direction in each case centrally of the associated pressure chamber 6 and connected by the pressure chamber 6 associated longitudinal slot 10 with the clamping surface.
  • the peripheral slots 13 extend over a larger circumferential area than the pressure chambers 6, here over an angular range of approximately 100 °.
  • the wall located between the pressure chambers 6 and the associated peripheral slots 13 is pushed inwardly.
  • the wall sections lying in the circumferential direction between the pressure chambers 6 are moved radially outwardly with the clamping regions 11, so that a component to be clamped can be inserted into the receptacle 5. If the pressure chambers 6 subsequently relieved again, return the clamping areas 1 1 by the elastic restoring force in its initial form and fix the inserted into the receptacle 5 component.
  • cavities 14 in the form of circumferential slots which extend in the circumferential direction and extend concentrically to the clamping axis X, are formed in the circumferential direction between the pressure chambers 6.
  • the circumferentially located ends of the circumferential slots 14 are adjoined by outwardly extending end slots 15 which extend arcuately around the ends of the pressure chambers 6.
  • FIGS. 7 to 10 show a third embodiment of a tensioning device according to the invention, which is designed as a chuck.
  • This embodiment corresponds to the previously described second embodiment with the proviso that the expansion chuck is designed as an actively exciting expansion chuck 1.
  • the three radial longitudinal slots 10 and the three provided between the receptacle 5 and the pressure chambers 6 circumferential slots 13 are rotated relative to the second embodiment by 60 °, so that the circumferential slots 13 as well as the cavities 14 substantially between the pressure chambers 6 extend while the clamping regions 1 1 radially lie directly within the pressure chambers 6, so that they are actively pressed inwards when the pressure chambers 6 are acted upon hydraulically.
  • FIGS. 11 and 12 show a fourth embodiment of a hydraulic tensioning device 1 according to the present invention designed as a chuck.
  • This hydraulic expansion chuck 1 corresponds to the first embodiment, but here an intermediate sleeve 16 is inserted into the receptacle 5.
  • cavities 14 in the form of circumferential slots with end slots 15 adjoining on the end side are provided between the pressure chambers 6, as in the third embodiment.
  • the intermediate sleeve 16 is provided in order to be able to passively clamp components in a central clamping bore 17 of the intermediate sleeve 16 with the expansion clamping device 1.
  • the outer surface of the intermediate sleeve 16 is designed and positioned so that it rests against the inner wall of the receptacle 5 only in the circumferential regions corresponding to the pressure chambers 6, ie in the circumferential direction of the central position of the pressure chambers 6
  • the intermediate sleeve 16 is spaced apart from the wall 7 at an increase in pressure in the pressure chambers 6 elastically outwards only in the contact areas and thus elastically deformed in the peripheral areas in between to form a component in the insert central clamping bore 17.
  • the intermediate sleeve 16 has for this purpose an outer cross-section of approximately triangular basic shape with rounded corner regions 18 which have a radius corresponding to the receptacle 5 and flattenings lying therebetween. With these rounded corner regions 18, the intermediate sleeve 16 abuts against the inner wall of the receptacle 5. It can also be seen in FIG. 12 that three radial retaining projections 19 are provided on the inner wall of the intermediate sleeve 16, which define clamping surface sections with which the intermediate sleeve 16 comes into abutment against a component to be clamped. It is also possible to segment the inner surface of the intermediate sleeve 16 by radial longitudinal slots.
  • the hydraulic Dehnspann drivingen 1 have a base body 2, which defines a clamping or chuck axis X. At its one end region, the main body 2 has a machine interface in the form of a clamping flange 2 for attachment to a machine tool. In the clamping flange 2a a total of three evenly distributed along the circumference arranged axial through holes 3 are formed, via which the Dehnspann issued 1 can be screwed to a work or machine table.
  • the front end region of the main body 2 is formed as a cylindrical mandrel 2b, which defines on the outside a clamping portion with a cylindrical clamping surface. On the clamping section, a component to be clamped can be pushed.
  • a total of three pressure chambers 6 are formed on the inside of the Spannab- cut, which are evenly distributed along the circumference of the clamping portion and spaced from each other.
  • the wall of the main body 2 is formed elastically in the areas located between the clamping surface of the clamping section and the pressure chambers 6 in such a way that it is elastically deformed outward by an increase in the hydraulic pressure in the pressure chambers 6 in order to force fit a component pushed onto the clamping section to fix.
  • the clamping portion does not have to be cylindrical over the entire circumference. It is also sufficient if the clamping surface is only in the peripheral areas in which the pressure chambers 6 are formed, are formed according to the cylinder section.
  • the fifth and sixth embodiments of the expansion chuck device shown in FIGS. 13 to 18 operate as actively exciting systems with which a component is tensioned by pressurization of the pressure chambers 6.
  • the actively exciting systems can also be used for passive voltage in previously described manner by a corresponding intermediate sleeve 16 is pushed onto the mandrel-shaped clamping portion of the Dehnspann Road 1, as shown in Figures 19 to 22.
  • the inner surface of the intermediate sleeve 16 is formed such that it rests only in the peripheral areas corresponding to the pressure chambers 6, ie approximately centrally in the direction of extension of the pressure chambers 6, on the outside of the wall of the clamping section, in the intermediate circumferential regions of the Wall is spaced, so that the intermediate sleeve 16 is elastically deformed at an increase in pressure in the pressure chambers 6 only in the contact areas elastically outward and thus in the lying between the abutment areas peripheral areas inwardly.
  • the intermediate sleeve 16 has an inner diameter that is larger than the outer diameter of the mandrel-shaped clamping portion of the Dehnspann Utah 1.
  • the outer surface of the intermediate sleeve 1 1 has a polygonal configuration with three protruding portions 21, which are positioned substantially between the pressure chambers 6, and located therebetween flats 22.
  • the projecting portions 21st have a radius of curvature corresponding to the inner diameter of a component to be clamped.
  • the pressure chambers 6 are subjected to pressure, so that the wall 7 of the clamping portion in the peripheral areas of the pressure chambers 6 are locally elastically deformed outwardly.
  • the portions of the intermediate sleeve 16 in contact therewith are also deformed outwardly, and the wall portions located between the abutment portions, i. the projecting portions of the polygonal shape are simultaneously elastically deformed inwardly, so that a component can be pushed onto the intermediate sleeve 16.
  • the wall 7 of the Dehnspann issued 1 and the intermediate sleeve 16 deform elastically back to its original shape, i. the protruding portions of the polygon shape are moved outwardly to tension the component.
  • a single pressure chamber 6 ' instead of the three discrete pressure chambers 6, a single pressure chamber 6 'provide, which extends along the entire circumference of the clamping portion and is concentric with the clamping axis X, since an application of this pressure chamber 6' only in the investment areas to the Intermediate sleeve 16 also leads to a corresponding deformation thereof (see Figure 24).
  • the intermediate sleeve 16 can also be formed in one piece with the base body 2 or connected to it in a materially bonded manner. LIST OF REFERENCE NUMBERS

Abstract

L'invention concerne un dispositif de serrage extensible hydraulique réalisé sous la forme d'un mandrin de serrage extensible, en particulier pour la fixation d'une pièce ou d'un outil à une machine-outil ou à une table de travail, comportant un corps de base (2) définissant un axe de serrage (X) et à l'extrémité avant duquel est réalisé un logement (5) central ouvert en direction de la surface frontale avant (4) du corps de base (2), dans lequel un composant à serrer (B) peut être introduit axialement. Le logement (5) est entouré par plusieurs chambres de pression (6) soumises à une action hydraulique qui sont réparties régulièrement sur la circonférence de la section de serrage et sont en particulier concentriques à l'axe de serrage. La paroi (7) du logement (5) du corps de base (2) est conçue pour être élastique dans les parties se trouvant entre la surface de serrage et les chambres de pression (6), de sorte qu'elle peut être déformée élastiquement vers l'intérieur par une augmentation de la pression hydraulique dans les chambres de pression (6) pour fixer à force un composant introduit dans le logement (5).
PCT/EP2017/076515 2016-10-17 2017-10-17 Dispositif de serrage extensible hydraulique WO2018073265A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17793598.8A EP3525969A1 (fr) 2016-10-17 2017-10-17 Dispositif de serrage extensible hydraulique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016119752.1A DE102016119752A1 (de) 2016-10-17 2016-10-17 Hydraulische Dehnspanneinrichtung
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CN111872863A (zh) * 2019-05-02 2020-11-03 翰默有限公司 可液压夹紧的工具固定器/工件固定器

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