EP1159105A1 - Mandrin de serrage - Google Patents

Mandrin de serrage

Info

Publication number
EP1159105A1
EP1159105A1 EP00918773A EP00918773A EP1159105A1 EP 1159105 A1 EP1159105 A1 EP 1159105A1 EP 00918773 A EP00918773 A EP 00918773A EP 00918773 A EP00918773 A EP 00918773A EP 1159105 A1 EP1159105 A1 EP 1159105A1
Authority
EP
European Patent Office
Prior art keywords
chuck
coolant supply
supply pipe
tool
coolant
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.)
Withdrawn
Application number
EP00918773A
Other languages
German (de)
English (en)
Inventor
Markus Berger
Thomas Retzbach
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.)
Fritz Schunk GmbH and Co KG Fabrik fuer Spann und Greifwerkzeuge
Original Assignee
Fritz Schunk GmbH and Co KG Fabrik fuer Spann und Greifwerkzeuge
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 Fritz Schunk GmbH and Co KG Fabrik fuer Spann und Greifwerkzeuge filed Critical Fritz Schunk GmbH and Co KG Fabrik fuer Spann und Greifwerkzeuge
Priority to DE20023275U priority Critical patent/DE20023275U1/de
Publication of EP1159105A1 publication Critical patent/EP1159105A1/fr
Withdrawn legal-status Critical Current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
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/10—Arrangements for cooling or lubricating tools or work
    • B23Q11/1015—Arrangements for cooling or lubricating tools or work by supplying a cutting liquid through the spindle
    • B23Q11/1023—Tool holders, or tools in general specially adapted for receiving the cutting liquid from the spindle

Definitions

  • the present invention relates to a chuck with a chuck body, in which a central receptacle for the shaft of a tool to be clamped is formed, and a clamping mechanism to fix a tool shaft inserted into the receptacle in the receptacle, a coolant channel being formed in the chuck body to supply a coolant to the machine-side end of a tool inserted into the receptacle with an internal coolant supply.
  • Chucks of this type are known in different embodiments and are primarily used to fix a tool shank such as a drill or milling shank in the work spindle of a corresponding machine tool.
  • the tools are cooled and / or lubricated in the area of the cutting edge via a coolant channel that extends axially from the tool cutting edge to the opposite end of the tool shaft.
  • CONFIRMATION KDPIE stretches.
  • a coolant channel is formed in the chuck, which runs from the spindle-side end for receiving the chuck and serves to supply a coolant and / or lubricant to the spindle-side end of the tool.
  • the coolant is supplied through an already existing through hole in the chuck body.
  • the object of the present invention is therefore to design a chuck of the type mentioned at the outset in such a way that a proper supply of a coolant and / or lubricant from the work spindle of a machine tool to the shank of a tool inserted into the chuck is ensured.
  • This object is achieved in that a coolant supply pipe extending between the machine-side end of the chuck body and the receptacle is provided as the coolant channel in the chuck body.
  • the coolant and / or lubricant is thus supplied from the work spindle of a machine tool for receiving the tool through a tube inserted into the chuck body, which can be made in one piece, but can also be divided axially.
  • the coolant and / or lubricant can be passed through the lining body essentially free of external influences.
  • turbulence due to lateral transverse bores, narrowing of the cross-section, etc. can be practically completely avoided by using, for example, a tube with an essentially constant inside diameter.
  • the tube can also have a flow cross section that decreases in the flow direction.
  • the coolant supply pipe will namely have a considerably larger inner diameter in its connection area to the machine side than at the end on the receiving side.
  • one or more transition sections can be provided, in which the inner diameter is continuously reduced. It is essential here that the inner contour of the tube is formed in such a way that only small power losses arise due to the change in cross section.
  • Another advantage of the solution according to the invention is that the coolant supply pipe with no or at least little additional effort can be built into the standard chuck currently used, since they have a through hole extending between the spindle-side end and the receptacle, into which the coolant supply pipe can be screwed, for example.
  • the thread is suitable, which is often provided anyway in chuck bodies for fixing an axial stop for the tool.
  • the coolant supply pipe projects into the area of the receptacle and forms an axial stop for the tool.
  • the invention provides for the tightening bolt to be hollow and to form the coolant supply pipe with at least one further tubular element.
  • pull studs' and tubular element expediently engage one another.
  • they can be inserted into one another or screwed together.
  • the chuck can also be provided with an HSK machine interface, in which case, instead of the pull stud, a conventional connecting element is provided for connection to a coolant supply device on the machine side.
  • FIG. 1 shows an embodiment of a chuck designed as a steep taper tool holder according to the present invention in a sectional side view
  • Figure 2 shows an embodiment of a tool holder with an HSK machine interface in a sectional side view.
  • a chuck designed as a steep taper tool holder is shown.
  • the chuck comprises a chuck body 1 made of a dimensionally stable material, which has a fastening cone 2 for clamping in a rotary driven work spindle A of a machine tool at one end region in a manner known per se.
  • a connecting shaft 3 is provided with a central receiving bore 4 into which a cylindrical shaft of a tool W, such as a drill or milling cutter, can be inserted, and between the fastening cone 2 and the connecting shaft 3 there is a central part 5 enlarged Diameter.
  • the chuck shown is designed as an expansion chuck and has, in a manner known per se, for fixing the shaft in the receiving bore 4 in the region of the connecting shaft 3 of the chuck body 1, an expansion mechanism, of which only a narrow annular chamber 6 is shown in the drawing. This is arranged around the receiving bore 4 and aligned coaxially with this.
  • the annular chamber 6, whose axial length corresponds approximately to the required clamping range, is delimited towards the receiving bore 4 by a relatively narrow inner wall 7 and radially outwards by an outer wall 8, the wall thickness of which is several times greater than the wall thickness of the inner wall 7 .
  • the annular chamber 6 is filled with a hydraulic medium such as oil and is connected in a manner not shown via a channel formed in the casing body 1 to a hydraulic medium source through which pressure can be applied to clamp the tool W.
  • the pressure medium source can be formed in a manner known per se from a cylinder chamber formed in the lining body 1, which is closed at the end by a piston-like actuator which can be screwed into the cylinder chamber to increase the pressure or unscrewed from the cylinder chamber to reduce the pressure.
  • This hydraulic pressure is transmitted via the channel to the annular chamber 6 and causes an elastic bulging of the inner wall 7 inwards until it firmly encloses the tool shaft inserted into the receiving bore 4.
  • clamping mechanisms can also be provided in order to fix the tool W in the receptacle 4.
  • a shrink fit can be produced by heating the chuck body while widening the receptacle and cooling it again after inserting the tool W.
  • the part of the chuck body that forms the receptacle represents the tensioning mechanism.
  • the tool W used in the receptacle 4 is a so-called tool with an internal coolant supply which, as indicated in the drawing, has a central through-bore 9 which extends from the spindle-side end to the cutting edge of the tool W, to which Tool coolant to supply a coolant and / or lubricant.
  • This coolant and / or lubricant which can for example be an air / oil mixture in the form of an oil mist, is fed to the machine-side end of the tool W from the work spindle A of the machine tool via a coolant channel formed in the chuck body 1.
  • this coolant channel is formed by a coolant supply pipe 10 which extends between the receptacle 4 and the spindle-side end of the chuck body 1 and has a constant inner diameter, so that the receptacle 4 is supplied with the coolant and / or lubricant without the risk of swirling can be.
  • the coolant supply pipe 10 is inserted into the inserted per 1 through hole and formed in two parts.
  • the first, work spindle-side section of the coolant supply pipe 10 is formed by a hollow pull stud 11, which is screwed into the work spindle-side end of the chuck body, typically for steep taper tool holders, and a pipe element 12 connects to the pull stud 11, which has one end at one end is inserted in the pull stud 11 with sealing by an O-ring 13 and is screwed to the casing body 1 at its other end on the receiving side.
  • the tubular element 12 has an externally threaded section 12a, which is in engagement with an internally threaded section la of the chuck body 1.
  • the internal thread section la normally serves to accommodate an axial stop for the tool W, which can be adjusted, for example, via a bevel gear, as described in the applicant's German patent application 198 36 912.3, so that the internal thread section la does not need to be specially manufactured.
  • the tubular element 12 can also serve as an axial stop for the tool shank.
  • FIG. 2 shows a further embodiment of a chuck according to the invention which is provided with an HSK machine interface.
  • the chuck of this embodiment has the same basic structure as the chuck previously described with reference to FIG. 1 with a chuck body 1 made of a dimensionally stable material, which can be coupled at one end to the work spindle of a machine tool and on its nem other axial end has a central receiving bore 4, into which a cylindrical workpiece shaft can be inserted and clamped via an expansion clamping mechanism, of which only the annular chamber 6 is shown.
  • a coolant supply pipe 10 is provided in the chuck body 1, which extends between the receptacle 4 and the spindle-side end region of the chuck body 1.
  • the coolant supply pipe 2 is inserted into the through-hole already present in the casing body 1 and is formed in two parts.
  • the first, work spindle-side section of the coolant supply pipe 10 is formed by a connection element 14 onto which a connection element of a coolant supply system on the work spindle side can be pushed, and the connection element 14 is followed by a pipe element 12 which is slidably inserted in the connection element 14 and is screwed to the casing body 1 at its other end on the receptacle side and protrudes into the receptacle 4.
  • the tubular element 12 serves here as an axial stop for the tool shaft and can be adjusted axially, for example, via a bevel gear.
  • the coolant supply pipe 10 in contrast to the coolant supply pipe of the embodiment shown in FIG. 1, does not have a constant diameter, but the diameter in the area of the connecting element 14 is considerable Larger than the inner diameter at the receiving end, the inlet-side end region of the tubular element 12 being designed as a conically tapering transition region 15 which connects the sections of different diameters to one another.
  • the transition area 15 extends over approximately 1/3 of the length of the tubular element 12 in order to create a “smooth” transition. The constant transitions between the areas of different diameters minimize power losses.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Gripping On Spindles (AREA)

Abstract

L'invention concerne un mandrin de serrage comportant un corps de mandrin (1) dans lequel est formée une cavité (4) prévue pour la tige d'un outil (W) à serrer, ainsi qu'un mécanisme de serrage (6) destiné à fixer dans la cavité (4), une tige d'outil introduite par poussée dans ladite cavité (4). Un canal d'agent de refroidissement est formé dans le corps du mandrin (1), afin d'acheminer un agent de refroidissement jusqu'à l'extrémité côté machine d'un outil (W) à alimentation intérieure en agent de refroidissement, introduit par poussée dans la cavité (4). Ce mandrin de serrage se caractérise en ce que le canal d'agent de refroidissement prévu dans le corps du mandrin (1) est un tuyau d'alimentation en agent de refroidissement (10) s'étendant entre l'extrémité côté machine du corps du mandrin (1) et la cavité (4).
EP00918773A 1999-03-10 2000-03-08 Mandrin de serrage Withdrawn EP1159105A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE20023275U DE20023275U1 (de) 1999-03-10 2000-03-08 Spannfutter

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19910710 1999-03-10
DE19910710A DE19910710A1 (de) 1999-03-10 1999-03-10 Spannfutter
PCT/EP2000/002029 WO2000053368A1 (fr) 1999-03-10 2000-03-08 Mandrin de serrage

Publications (1)

Publication Number Publication Date
EP1159105A1 true EP1159105A1 (fr) 2001-12-05

Family

ID=7900502

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00918773A Withdrawn EP1159105A1 (fr) 1999-03-10 2000-03-08 Mandrin de serrage

Country Status (4)

Country Link
EP (1) EP1159105A1 (fr)
AU (1) AU3961300A (fr)
DE (1) DE19910710A1 (fr)
WO (1) WO2000053368A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10009244A1 (de) * 2000-02-28 2001-08-30 Komet Stahlhalter Werkzeuge Anzugsbolzen für Spannschäfte von Maschinenwerkzeugen
EP1597007B2 (fr) 2003-02-20 2017-06-21 Gühring KG Porte-outil
DE10331769B4 (de) * 2003-07-14 2006-06-29 Schunk Gmbh & Co. Kg Fabrik Für Spann- Und Greifwerkzeuge Spannfutter
FR3062325B1 (fr) * 2017-01-30 2020-02-07 Evatec Dispositif d'isolation thermique d'un attachement d'usinage et attachement d'usinage pourvu d'un tel dispositif.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3905609A (en) * 1974-03-04 1975-09-16 Ernst Sussman Collet seal
DE4218237A1 (de) * 1992-06-03 1993-12-09 Adolf Wellach Werkzeughalter
JP3180870B2 (ja) * 1994-10-25 2001-06-25 株式会社日研工作所 工具ホルダ
JP3258626B2 (ja) * 1997-07-29 2002-02-18 株式会社エムエスティコーポレーション 工具ホルダ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0053368A1 *

Also Published As

Publication number Publication date
DE19910710A1 (de) 2000-09-21
AU3961300A (en) 2000-09-28
WO2000053368A1 (fr) 2000-09-14

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