WO2017186462A1 - Dispositif et procédé de fixation pour fixer un outil non rotatif sur une machine-outil. - Google Patents

Dispositif et procédé de fixation pour fixer un outil non rotatif sur une machine-outil. Download PDF

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Publication number
WO2017186462A1
WO2017186462A1 PCT/EP2017/058025 EP2017058025W WO2017186462A1 WO 2017186462 A1 WO2017186462 A1 WO 2017186462A1 EP 2017058025 W EP2017058025 W EP 2017058025W WO 2017186462 A1 WO2017186462 A1 WO 2017186462A1
Authority
WO
WIPO (PCT)
Prior art keywords
tool
clamping device
clamping
receptacle
base body
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.)
Ceased
Application number
PCT/EP2017/058025
Other languages
German (de)
English (en)
Inventor
Eugen VOLZ
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.)
Schunk SE and Co KG
Original Assignee
Schunk SE and Co KG
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
Priority claimed from DE102016108133.7A external-priority patent/DE102016108133B4/de
Application filed by Schunk SE and Co KG filed Critical Schunk SE and Co KG
Publication of WO2017186462A1 publication Critical patent/WO2017186462A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • B23B25/00—Accessories or auxiliary equipment for turning-machines
    • B23B25/06—Measuring, gauging, or adjusting equipment on turning-machines for setting-on, feeding, controlling, or monitoring the cutting tools or work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
    • B23B29/04—Tool holders for a single cutting tool
    • 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
    • B23B31/005—Cylindrical shanks of tools
    • 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
    • B23B2231/46—Pins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2260/00—Details of constructional elements
    • B23B2260/136—Springs

Definitions

  • the invention relates to a clamping device or a chuck for fixing a non-rotatable tool, in particular a turning tool on a machine tool with a clamping axis defining base body, are formed on the machine side, rear end positioning means to the clamping device in a predetermined angular position relative to the Clamping axis to be positioned on the tool holder of a machine tool, and at the front end portion of a clamping area is formed with a front end face of the main body open towards the central receptacle for a tool shank. Furthermore, the invention relates to a method for fixing a non-rotatable tool on a machine tool by means of such a clamping device.
  • Such clamping devices or chucks are known in the prior art in different configurations and serve to fix tools on a machine tool. They have a base body which has a machine interface at its rear end region, by means of which they can be fixed to a corresponding tool holder receptacle on the machine tool, and on the opposite side a clamping region is formed with a central receptacle open towards the front end face of the main body which can be inserted too exciting tool shank.
  • the fixation can be done in the case of an embodiment of the clamping device as a heat shrinkage in a simple manner by the clamping area is heated, so that the Werkzugschaft can be inserted into the receptacle, and then cooled again to produce the desired interference fit.
  • the chucks may be formed with a clamping mechanism to produce the necessary radial clamping force.
  • a clamping mechanism for example, a distinction is made between collet chucks, hydraulic expansion chucks, etc.
  • the present invention relates in particular to clamping devices which are designed as hydro-expansion chucks. These usually comprise a base body, which defines a clamping or chuck axis, and an expansion sleeve, forming an expansion sleeve and can be acted upon by a hydraulic pressure chamber is inserted into the base body and which forms the front end face of the main body towards the central receptacle, in which can be inserted too exciting tool shank.
  • 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 machine-side interface may be rotationally symmetrical, since an angular orientation of the Dehnspann adopted with respect to the chuck axis for machining does not matter.
  • the situation is different with non-rotating tools such as lathe tools. These must be aligned exactly to the machine tool to ensure accurate machining, so that the cutting edge of the turning tool occupies a defined position.
  • the hydraulic tensioning devices have an interface at their rear end region, which makes it possible to define the tensioning device in a defined manner Position the angular position in a corresponding tool holder receptacle of a revolver.
  • an axial positioning bore for example, is provided in the rear end face of the base body of the tensioning device, with which a corresponding pin is brought into engagement with the turret in order to position the tensioning device in the tool holder receptacle.
  • Object of the present invention is therefore to provide a clamping device, in particular a hydraulic Dehnspann thanks of the type mentioned in such a way that a tool shaft mounted in a predetermined angular position relative to the clamping axis in the clamping device and a quick-change tool holder of a machine tool and in particular a revolver of a center of rotation can be. Furthermore, a method should be given to fix a tool shank in such a clamping device in a predetermined angular position.
  • a clamping device of the type mentioned in that the wall of the body is penetrated radially by a transverse bore, which opens axially behind the pressure chamber into the central receptacle, and that in the transverse bore an alignment element is arranged radially movable can be brought into engagement with a tool shank inserted into the receptacle in order to expose the tool shank in a predetermined angular position relative to the clamping axis. judge.
  • the object is achieved by a method of the type mentioned, in which for fixing a non-rotatable tool, in particular a turning tool, on a machine tool by means of a clamping device according to one of the preceding claims, wherein the rear end portion of the body on a tool holder of the machine tool fixed and thereby aligned on the positioning means in a predetermined angular position relative to the clamping axis of the clamping device, a tool shank, which is provided on its outer periphery with a reference surface, in particular a Weldon recess, is inserted into the central receptacle of the body, the alignment is brought radially into engagement with the reference surface to align the tool shank in a predetermined angular position with respect to the clamping axis, and the tool shank is clamped in the aligned position in the receptacle, wherein the alignment element is brought out of engagement with the reference surface of the tool shank after aligning the tool shank and in particular after tightening the tool sh
  • an alignment is provided, which is held in a transverse bore of the base body and movable into the central receptacle, so that it can be brought into contact with a too exciting tool shank.
  • the invention is based on the idea to use a tool shank having a defined, in particular flat reference surface, to which the tool cutting edge is aligned in a predetermined manner, namely in particular runs parallel to this.
  • Such tools are already commercially available, for example, so-called.
  • Weldon tool shanks can be used, which have on their outer surface a recess with a flat bottom portion and inclined front and rear end face.
  • Such recesses are usually used to the tool shank in the tool holder over to fix a locked from the outside locking element non-positively and thus to secure against axial emigration.
  • the alignment member When the alignment member is brought into contact with such a reference surface, the tool is automatically rotated so that the reference surface is perpendicular to the alignment member.
  • the pointing into the recording and coming into contact with the tool end face is flat when the corresponding reference surface on the tool shank is also formed as a flat surface such as the bottom of the Weldon recording.
  • the planar end face of the alignment can come to rest flat on the flat face of the tool shank to align the tool shank in the predetermined angular position relative to the Dehnspann interference.
  • the end face may also have a different shape as long as the reference surface / receptacle in the tool shank has a contour corresponding to the end face.
  • a convex end face is conceivable if the receptacle in the tool shank has a correspondingly concave contour. It is important that the surfaces of the end face come to rest flatly under indentation in order to ensure alignment of the tool shank in the present angular position relative to the expansion chuck.
  • an alignment element in the form of a screw, which is screwed into the transverse bore, so that the inner end surface comes into contact with the corresponding reference surface on the tool shank to align the alignment element angularly.
  • the screw is brought out of contact with the reference surface after the alignment process, and in particular after the tool shank has been fixed, in order to release the tool shank.
  • the alignment is arranged radially displaceable in the transverse bore, that elastic return means are provided which bias the alignment in a radially outer starting positions and that the alignment against the return force of the elastic return means from the starting position can be pressed radially inward into the receptacle to align a tool shaft located thereon in a predetermined angular position with respect to the clamping axis.
  • the aligning element can be manually pressed by a person preparing the clamping device against the return force of the elastic return means in the recording. This creates the opportunity to use and align the tool without the aid of tools or other aids in the clamping device.
  • the preparing person with one hand holding the clamping device and press the alignment inward and insert the tool into the receptacle of the clamping device with the other hand. If the flat reference surface of the tool shank facing the alignment, this is pressed by the pressure of the person preparing to the reference surfaces of the train. In this case, the tool shaft is aligned by the pressure in a predetermined angular position relative to the clamping device.
  • the elastic return means are inserted into the transverse bore and comprise a compression spring, in particular a helical compression spring, which is supported between the base body and the alignment element.
  • a compression spring in particular a helical compression spring, which is supported between the base body and the alignment element.
  • the pin-like alignment element can pass through the spiral compression spring and thus supported on the inside.
  • the transverse bore is formed as a stepped bore with a radially outer bore portion of larger diameter and a radially inner bore portion of smaller diameter, wherein between the two bore portions a shoulder is formed, on which the elastic return means are supported on the body side.
  • a stepped bore can be produced in the wall of the base body without great effort and, due to its nature, automatically provides a shoulder for the basic body-side support of the elastic return means.
  • the alignment element may have a protruding outwardly with respect to the axis of the transverse bore and in particular flange-like along the circumference of the alignment element extending projection, in which case the elastic return means are supported on the side facing the receiving side of the projection.
  • the flange has a flange-like length along the circumference of the alignment element. ckende projection corresponding to the bore portion of larger diameter diameter, so that the alignment element is guided by the projection at least in this bore portion.
  • a securing element is provided with a central passage opening which partially closes the transverse bore to the outside of the tensioning device in order to secure the alignment element within the transverse bore, the alignment element extending into or passing through the passage opening and in the starting position an axial abutment surface of the alignment member, which is formed in particular by the top of a projection of the alignment, comes to rest on the securing element.
  • the securing element may be, for example, a hollow pin screwed into the transverse bore from the outside or a snap ring held in the transverse bore. The securing element thus ensures that the alignment element, which is movably arranged in the transverse bore, can move radially outward to a maximum extent in the radially outer starting position.
  • the alignment element is longer than the transverse bore. This offers the advantage that the alignment element, at least in the starting position, protrudes radially outward from the transverse bore of the base body, as a result of which a person preparing the expansion tensioning device can easily press the alignment element inwards.
  • the alignment element is flush in the initial position with the outer surface of the base body or even slightly offset radially inwardly relative to the outer surface. In the latter two, the cross-sectional area of the alignment element should be large enough so that the alignment element can be pressed radially inward without the aid of a tool.
  • the alignment element may be formed like a pin and preferably has a circular cross section, so that it is particularly suitable for the radially movable arrangement in the transverse bore.
  • a toothing is formed on the rear end region of the base body in order to fix the tensioning device to the tool holder of the machine tool.
  • the toothing can be formed in a plane surface, wherein the transverse bore expediently perpendicular to the plane surface.
  • the positioning means may have a positioning hole, which is formed in a rear end face of the base body and extends parallel to the clamping axis.
  • it can also be provided any other type of interface, which allows an angular orientation of the clamping device on a corresponding tool-side holder holder.
  • the transverse bore is perpendicular to the reference surface. If the indentation of a tool shank is designed as a flat surface, it can advantageously extend parallel to the reference surface.
  • the clamping region can in principle be designed in any desired way, which makes it possible to fix a tool shank in the receptacle in a force-fit manner.
  • the clamping device according to the present invention is designed as a hydraulic expansion chuck and correspondingly characterized in that the receptacle is surrounded annularly by a pressure chamber which can be acted upon by a hydraulic medium and the wall between the receptacle and the pressure chamber is designed such that they can be elastically deformed radially inwards by an increase in pressure in the pressure chamber is to frictionally fix a tool shaft used in the recording.
  • a configuration as a heat shrinkage chuck or collet chuck is also conceivable.
  • the main body can be manufactured in a manner known per se at least in the clamping region by means of a generative manufacturing process. Generative manufacturing processes even allow the production of complicated and / or filigree structures, such as the pressure chamber of the body.
  • the clamping region may comprise a cylindrical expansion bushing as a hydraulic expansion chuck, which is inserted into the basic body to form the pressure chamber and forms at least one axial section of the central receptacle.
  • Figure 1 is a schematic perspective view of a clamping device according to the invention according to an embodiment of the present invention
  • Figure 2 is a sectional view taken along section line II-II in Figure 1;
  • FIG. 3 shows a sectional view along the section line III-III in Figure 2.
  • FIGS 1 to 3 show a clamping device formed as a chuck 1 for fixing a non-rotatable tool, here a turning tool, on a machine tool according to an embodiment of the present invention.
  • the clamping device 1 comprises a base body 2, the defines a chuck or chuck axis X.
  • the main body 2 At its left end region 3 in the drawing, the main body 2 has a machine interface 4. This is substantially cylindrical, but has on its upper side provided with a toothing 5 plane surface. With the teeth 5 corresponding locking means are brought in a conventional manner in engagement to fix the clamping device 1 in a tool holder holder, for example, a revolver.
  • the machine interface further comprises positioning means in the form of a positioning hole 4a, which is formed in the rear end face of the base body 2 and extends parallel to the clamping axis X. With this positioning hole a corresponding pin is engaged on the turret to position the clamping device 1 in the tool holder receptacle of the revolver.
  • a clamping portion 7 for clamping a tool with a front end face 8 of the main body 2 toward open central receptacle 9 is formed for a tool shank.
  • This can be designed in any way to fix the tool shank in the receptacle 9 frictionally.
  • the clamping device is designed as a hydraulic expansion chuck.
  • the receptacle 9 is annularly surrounded by a pressurizable with a hydraulic fluid pressure chamber 10, wherein the wall 1 1 between the receptacle 9 and the pressure chamber 10 is formed so thin and elastic that it is elastically deformable by an increase in pressure in the pressure chamber 10 inwardly to frictionally fix a tool shaft used in the receptacle 9.
  • the pressure chamber 10 is filled with a hydraulic medium, such as oil, and is connected via a hydraulic medium line 12 formed in the main body 2 to a pressure generator.
  • tion device 13 in conjunction, by which they can be applied to tension a component with pressure.
  • the pressure generating device 13 comprises a clamping piston 14 which is adjustable for pressure generation by means of a clamping screw 15 in a cylinder bore 16 along a central cylinder bore axis.
  • a cylindrical expansion sleeve 17 is used and soldered to the base body 2, which has an axial portion of the central receptacle 9 of the hydraulic Dehnspann noticed 1 forms.
  • annular flange 18 is formed, which forms the front end face 8 of the Dehnspann issued 1 and at the same time an axial stop surface for an inserted tool.
  • the wall 19 of the main body 2 is penetrated by a transverse bore 20, which opens axially behind the pressure chamber 10 into the central receptacle 9.
  • the arrangement is made such that the provided with the teeth 5 or defined by this flat surface and the transverse bore 20 are perpendicular to each other.
  • the transverse bore 20 is designed as a stepped bore with a radially outer bore section 21 of larger diameter and a radially inner bore section 22 of smaller diameter. forms, between the two bore portions 21, 22, a shoulder 23 is formed.
  • a pin-like alignment element 24 is arranged radially displaceable. It has at its receiving-side end a flat end face 25 and has a relation to the axis of the transverse bore 20 outwardly projecting projection 26 which extends in a flange along the circumference of the alignment member 24.
  • an annular securing element 28 is provided, which is screwed into the transverse bore 20 from the outside.
  • the projection 26 of the alignment member 24 comes into abutment to limit the displacement of the alignment member 24 to the outside and so to define a radially outer starting position of the alignment member 24.
  • the arrangement is chosen so that in this radially outer starting position of the outer end portion of the alignment member 24 passes through the central through hole 29 of the annular securing element 28 and protrudes from the transverse bore 20, the inner end portion of the alignment member 24 but within the transverse bore 20 and thus not in the area of the receptacle 9 protrudes.
  • an elastic return means 27 is used in the form of a spiral compression spring, which is supported between the shoulder 23 of the transverse bore 20 and the receiving side facing the projection 26 of the alignment member 24 to the alignment member 24 in its radially outer To press home position.
  • the alignment member 24 can be pressed against the return force of the coil spring 27 from the starting position radially inwardly into the receptacle 9 to a tool shaft located therein in a predetermined angular position relative to the Dehnspann worn first align.
  • the tool shank is provided with a recess or a flattening, as they are known from so-called. Weldon tool shanks. When mounting such a tool shank this is inserted into the receptacle 9 and at the same time the alignment member 24 is pressed into the receptacle 9, so that the flat end face 25 of the alignment member 24 comes to the tool shank outside the plant.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)

Abstract

Dispositif de fixation (1) pour fixer un outil non rotatif, en particulier un outil de tour, sur une machine-outil, ledit dispositif de fixation (1) comprenant un corps (2) définissant un axe de fixation (X), dont l'extrémité arrière (3), côté machine, comporte des moyens de positionnement servant à positionner le dispositif de fixation (1) dans une position angulaire prédéfinie par rapport à l'axe de fixation (X), sur le porte-outil d'une machine-outil, et dont l'extrémité avant (6) comporte une zone de fixation (7) présentant un logement central (9) s'ouvrant sur la face terminale avant (8) du corps (2), destiné à accueillir une queue d'outil, et procédé pour fixer un outil non rotatif au moyen dudit dispositif de fixation (1).
PCT/EP2017/058025 2016-04-29 2017-04-04 Dispositif et procédé de fixation pour fixer un outil non rotatif sur une machine-outil. Ceased WO2017186462A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102016108059 2016-04-29
DE102016108059.4 2016-04-29
DE102016108133.7 2016-05-02
DE102016108133.7A DE102016108133B4 (de) 2016-05-02 2016-05-02 Spanneinrichtung zum Fixieren eines nicht drehbaren Werkzeugs an einer Werkzeugmaschine

Publications (1)

Publication Number Publication Date
WO2017186462A1 true WO2017186462A1 (fr) 2017-11-02

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PCT/EP2017/058025 Ceased WO2017186462A1 (fr) 2016-04-29 2017-04-04 Dispositif et procédé de fixation pour fixer un outil non rotatif sur une machine-outil.

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Country Link
WO (1) WO2017186462A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11583940B2 (en) 2020-03-05 2023-02-21 Schaublin Sa Clamping device for clamping a tool or work piece

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE509421C2 (sv) * 1995-09-04 1999-01-25 Sandvik Ab Svarvbom samt don för lägesinställning av svarvbommar
US20130322980A1 (en) * 2012-06-01 2013-12-05 Nikken Kosakusho Works, Ltd. Shank Structure of End Mill and Tool Holder
DE102012111456A1 (de) * 2012-11-27 2014-05-28 Kennametal Inc. Hydraulisches Dehnspannfutter und Verfahren zur Herstellung eines solchen Dehnspannfutters
DE202014102058U1 (de) * 2014-05-02 2015-08-11 Rainer Pfister Werkzeughalter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE509421C2 (sv) * 1995-09-04 1999-01-25 Sandvik Ab Svarvbom samt don för lägesinställning av svarvbommar
US20130322980A1 (en) * 2012-06-01 2013-12-05 Nikken Kosakusho Works, Ltd. Shank Structure of End Mill and Tool Holder
DE102012111456A1 (de) * 2012-11-27 2014-05-28 Kennametal Inc. Hydraulisches Dehnspannfutter und Verfahren zur Herstellung eines solchen Dehnspannfutters
DE202014102058U1 (de) * 2014-05-02 2015-08-11 Rainer Pfister Werkzeughalter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11583940B2 (en) 2020-03-05 2023-02-21 Schaublin Sa Clamping device for clamping a tool or work piece

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