EP3713700A1 - Outil d'usinage d'une pièce par enlèvement de copeaux - Google Patents

Outil d'usinage d'une pièce par enlèvement de copeaux

Info

Publication number
EP3713700A1
EP3713700A1 EP18808001.4A EP18808001A EP3713700A1 EP 3713700 A1 EP3713700 A1 EP 3713700A1 EP 18808001 A EP18808001 A EP 18808001A EP 3713700 A1 EP3713700 A1 EP 3713700A1
Authority
EP
European Patent Office
Prior art keywords
longitudinal axis
sleeve
holder
abutment surface
conical
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.)
Pending
Application number
EP18808001.4A
Other languages
German (de)
English (en)
Inventor
Markus Kannwischer
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.)
Hartmetall Werkzeugfabrik Paul Horn GmbH
Original Assignee
Hartmetall Werkzeugfabrik Paul Horn GmbH
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 Hartmetall Werkzeugfabrik Paul Horn GmbH filed Critical Hartmetall Werkzeugfabrik Paul Horn GmbH
Publication of EP3713700A1 publication Critical patent/EP3713700A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/26—Securing milling cutters to the driving spindle
    • 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
    • B23B31/11—Retention by threaded connection
    • B23B31/1107—Retention by threaded connection for conical parts
    • B23B31/1122—Retention by threaded connection for conical parts using cylindrical threads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/16—Milling-cutters characterised by physical features other than shape
    • B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
    • B23C5/22—Securing arrangements for bits or teeth or cutting inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/02—Connections between the shanks and detachable cutting heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/03—Cutting heads comprised of different material than the shank irrespective of whether the head is detachable from the shank
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2240/00—Details of connections of tools or workpieces
    • B23C2240/32—Connections using screw threads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2250/00—Compensating adverse effects during milling
    • B23C2250/12—Cooling and lubrication
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D2277/00—Reaming tools
    • B23D2277/02—Cutting head and shank made from two different components which are releasably or non-releasably attached to each other

Definitions

  • the present invention relates to a tool for machining a workpiece.
  • the tool has a cutting head with a sleeve and a cutting body attached to the sleeve, on which at least one cutting edge is arranged.
  • the cutting head extends along a first longitudinal axis.
  • the tool further includes a holder to which the cutting head can be releasably secured.
  • the holder extends along a second longitudinal axis.
  • the present invention relates in particular a milling tool, more preferably a Kugelbahnfrä- ser.
  • Ball track milling cutters for use. These ball race cutters mill on the face side at different engagement widths and machining depths, for which purpose the ball race milling cutter is normally inclined at an angle, e.g. 20 °, is started. In some cases, the webs correspond to cylinder cut-outs, but in some cases the webs are also curved, which requires very rigid tools. Milling is carried out both in soft and in hardened materials. Depending on the application, different types of tools are currently used.
  • Exemplary ball race cutters are described in DE 199 56 592 A1 and DE 199 45 360 A1.
  • a particular challenge in the design of ball track cutters is to provide an interface between the holder and the cutting head, which has a corresponding rigidity in order to intercept the forces occurring during machining.
  • the interface becomes due to the angled setting of the ball track milling cutters suspended between holder and cutting head in such tools a high bending stress.
  • the interface must therefore be able to absorb this bending stress without having to accept losses in terms of the accuracy of the tool.
  • the sleeve has a first axial bearing surface which at least partially surrounds the first longitudinal axis and orthogonal to the first longitudinal axis, wherein the sleeve has a first conical contact surface, which first longitudinal axis at least partially surrounds and extends symmetrically to the first longitudinal axis, the sleeve further having an internal thread, which is disposed within the sleeve in a region which is located locally between the first axial bearing surface and the first conical contact surface, wherein the Holder has a second abutment surface which at least partially surrounds the second longitudinal axis and orthogonal to the second longitudinal axis, and wherein the holder has a second conical contact surface which at least
  • Cutting head screwed onto the holder according to the present invention is the type of positioning of the cutting head relative to the holder.
  • the positioning of the cutting head or the sleeve of the cutting head according to the invention via two corresponding conical surfaces and two corresponding planar surfaces.
  • the conical surfaces are present as the first and second conical contact surfaces
  • first conical contact surface is arranged on the cutting head and the second conical contact surface is arranged on the holder.
  • the planar surfaces are referred to herein as first and second axial abutment surfaces, wherein the first axial abutment surface is arranged on the cutting head and the second axial abutment surface is arranged on the holder.
  • the supporting contact surfaces ie the conical and axial contact surfaces, are
  • This type of interface provides for an extremely stable support and at the same time for a very accurate positioning.
  • the axial contact surfaces only absorb forces in the axial direction.
  • the conical abutment surfaces simultaneously serve for better centering of the cutting head and absorb forces both in the axial and in the radial direction.
  • Conical abutment surfaces have the advantage, in particular over cylindrical contact surfaces, of better centering of the cutting head, since manufacturing tolerances in the orthogonal direction to the longitudinal axis are reduced during the increasing screwing-in process. Furthermore, the conical surfaces can be brought together better in the direction of the longitudinal axis, since contact only occurs in the final positioning of the conical lateral surfaces. Therefore, the conical lateral surfaces wear much less than cylindrical lateral surfaces would do at this point. Another advantage lies in the larger area of the conical surface of the conical bearing surfaces in relation to a cylindrical surface of cylindrical bearing surfaces, which increases the bearing portion of the conical abutment surfaces.
  • the cutting head and the holder in the assembled state of the tool contact exclusively along the inner or outer thread and along the axial and conical contact surfaces. Further contact surfaces or contact points do not exist according to this preferred embodiment.
  • the first axial abutment surface is arranged on an end face of the sleeve and the first conical abutment surface in the interior of the sleeve.
  • the first conical bearing surface is thus well protected against damage. This is particularly advantageous for an exact positioning of the sleeve relative to the holder.
  • a bevel is on a front side of the holder
  • the chamfer arranged on the holder serves as an introduction chamfer.
  • a radius is arranged on the holder between the external thread and the second axial abutment surface.
  • This radius serves as a transition radius between the external thread and the second axial abutment surface and in particular has the advantage that in this way the notch strength is increased.
  • the holder has a shaft on which the
  • External thread is arranged, wherein the shaft is at least partially made of hard metal, and wherein the sleeve is at least partially made of steel.
  • the production of the holder shaft made of hard metal ensures high rigidity and
  • the shaft of the invention therefore has relatively long carburetor.
  • the holder further comprises a shaft holder, in which the shaft can be releasably secured, wherein the shaft holder is at least partially made of steel.
  • the cutting body is preferably made of hard metal, cubic crystalline boron nitride (CBN) or polycrystalline diamond (PCD).
  • CBN cubic crystalline boron nitride
  • PCD polycrystalline diamond
  • the first conical contact surface is inclined at a first angle of inclination relative to the first longitudinal axis.
  • the second conical contact surface is inclined at a second inclination angle relative to the second longitudinal axis, wherein the first and the second inclination angle are equal.
  • the inclination angle thus correspond to half the opening angle of the respective cone.
  • the two angles of inclination are preferably in the range of 10 ° -45 °, more preferably in the range of 15 ° -30 °.
  • the internal thread and the external thread are identical. According to a further embodiment, the internal thread and the external thread
  • Trapezoidal threads are very stable and are suitable for transmitting high forces.
  • the internal thread and the external thread each have at least two
  • a coolant channel extending along the second longitudinal axis is arranged in the holder.
  • a plurality of distribution channels are arranged, which wear into a cavity arranged in the sleeve, which corresponds in the mounted state of the tool with the coolant channel.
  • the cavity in the sleeve serves to distribute the coolant and lubricant within the sleeve to the individual distribution channels.
  • This flat surface serves as an attack or clamping surface for a tool key for
  • Fig. 1 is a perspective view of an embodiment of the tool according to the invention.
  • FIG. 2 is an exploded view of the tool shown in FIG. 1; FIG.
  • Fig. 3 is a sectional view of the tool shown in Fig. 1;
  • FIG. 4 shows a perspective view of a cutting head of the tool shown in FIG. 1;
  • Fig. 5 is an exploded view of the cutting head shown in Fig. 4;
  • Fig. 6 is a front plan view of the cutting head shown in Fig. 4;
  • Fig. 7 is a first sectional view of the cutting head shown in Fig. 6;
  • Fig. 8 is a second sectional view of the cutting head shown in Fig. 6; 9 is a perspective view of a cutting head according to a second embodiment; and
  • FIG. 10 is a perspective view of a cutting head according to a third embodiment.
  • FIG. 1 shows a first embodiment of the tool according to the invention in the assembled state (Fig. 1), in a disassembled state (Fig. 2) and in a sectional view (Fig. 3).
  • the tool is designated therein in its entirety by the reference numeral 10.
  • the tool 10 is designed as a ball raceway milling cutter.
  • the tool 10 includes a
  • Cutting head 12 and a holder 14 in which the cutting head 12 is releasably attached.
  • the cutting head 12 has a sleeve 16 and a cutting body 18 fastened to the sleeve 16.
  • the holder 14 comprises a shaft 20 and a shaft holder 22, in which the shaft
  • the shaft holder 22 has at its rear end a tool interface 24 by means of which the tool 10 can be clamped in a machine tool (not shown).
  • the sleeve 16 of the cutting head 12 is bolted to the shaft 20 of the holder 14.
  • Shank 20 is secured against rotation in the shaft holder 22.
  • the shaft 20 is shrunk into the shaft holder 22.
  • a screw connection or another type of non-rotatable connection would be conceivable at this point.
  • the cutting head 12 extends substantially along a first longitudinal axis 28.
  • the holder 14 extends substantially along a second longitudinal axis 30. Both longitudinal axes 28, 30 coincide in the assembled state of the tool 10.
  • the individual components of the tool 10 are preferably produced in an alternating sequence of hard metal and steel.
  • the cutting body 18 is preferably made of hard metal.
  • the sleeve 16 is preferably made of steel.
  • the shaft 20 is preferably made of hard metal.
  • the shaft holder 22 is preferably made of steel.
  • the sleeve 16 and the cutting body 18 are soldered together.
  • the sleeve 16 and the cutting body 18 are soldered together.
  • Cutting body 18 by means of a brazing blunt soldered to the sleeve 16.
  • a bore 32 arranged centrally in the cutting body 18 (see FIG. 7) and a pin 34 corresponding thereto, which is arranged on the sleeve 16, serve to support the positioning during the soldering process. It should be noted, however, that other types of connection between the sleeve 16 and the cutting body 18, for example a screw connection, are possible.
  • the present invention relates in particular to the connection between the cutting head 12 and holder 14, more particularly the connection between the sleeve 16 and the shaft 20.
  • the Sleeve 16 has a first axial abutment surface 36, which corresponds to a shaft 20 disposed on the second axial abutment surface 38.
  • the sleeve 16 has an internal thread 40 which corresponds with a corresponding external thread 42 which is arranged on the shaft 20.
  • the sleeve 16 has a first conical contact surface 44 which corresponds to a second conical contact surface 46 arranged on the shaft 20.
  • cutting head 12 and sleeve 20 occur in the assembled state of the tool
  • the first axial abutment surface 36 is disposed on the lower end side of the sleeve 16 and extends orthogonal to the first longitudinal axis 28 of the cutting head 12.
  • the first axial abutment surface 36 is preferably designed as an annular surface.
  • the second axial abutment surface 38 is arranged on the upper side of the shaft 20 and extends orthogonal to the second longitudinal axis 30 of the holder 14.
  • the second axial abutment surface 38 is preferably also designed as an annular surface.
  • the first conical contact surface 44 is disposed inside the sleeve 16 and extends transversely, that is not parallel, to the first longitudinal axis 28 of the cutting head 12.
  • the first conical contact surface 44 is preferably at a first angle of inclination oti relative to the first longitudinal axis 28th inclined (see Fig. 7). This inclination angle oti corresponds to half the opening angle of the cone, on the lateral surface of which the first conical bearing surface 44 lies.
  • the first inclination angle oti is preferably in the range of 10 ° -45 °, more preferably in the range of 15 ° -30 °.
  • the first conical contact surface 44 preferably completely surrounds the first longitudinal axis 28.
  • the second conical abutment surface 46 is arranged on the upper end side of the shaft 20 and inclined at a second inclination angle a 2 , which is the same as the first inclination angle ai, relative to the second longitudinal axis 30 of the holder 14.
  • the internal thread 40 provided in the interior of the sleeve 16 is arranged in a region which is located locally between the first axial abutment surface 36 and the first conical abutment surface 44.
  • the external thread 42 arranged on the shank 20 is arranged in a region which is located locally between the second axial abutment surface 38 and the second conical abutment surface 46.
  • Bearing surface 36 and the first conical bearing surface 44 is arranged, but does not imply that the internal thread 40 at its two ends directly adjacent to the first axial abutment surface 36 and the first conical abutment surface 44. This may or may not be the case. In between, an undercut or a pure distance can also be provided in each case. Likewise, the second axial abutment surface 38 and the second conical abutment surface 46 may abut directly on the two opposite ends of the male thread 42, but need not. In between, an undercut or a pure distance can also be provided in each case.
  • the internal thread 40 and the external thread 42 are preferably designed as a trapezoidal thread, each having at least two threads.
  • a bevel 48 is arranged on the shank 20, which is intended to prevent damage to the first conical abutment surface 44 when the shank 20 is inserted into the sheath 16.
  • the second conical contact surface 46 is thus arranged between this chamfer 48 and the external thread 42.
  • a transition radius 50 is arranged (see FIG. 2). This transition radius 50 serves to improve notch strength.
  • the internal thread 40 does not directly adjoin the first conical contact surface 44. Between the internal thread 40 and the first conical contact surface 44, an internal free recess 52 is arranged. At the opposite end of the internal thread 40, an internal free groove 54 is also arranged.
  • the tool 10 further comprises a coolant channel 56, which runs in the interior of the holder 14.
  • the coolant channel 56 extends inter alia in the interior of the shaft 20 along the longitudinal axis 30.
  • the coolant channel 56 opens into a cavity 58 in the interior of the sleeve 16. From this cavity 58, the coolant and lubricant spreads out a plurality of distribution channels 60, which are located inside the sleeve 16 and exit at the top of the sleeve 16.
  • a flat surface 62 is further provided, which as
  • Attack surface for a fork wrench for mounting the cutting head 12 is used. These plane surface 62 preferably runs parallel to the first longitudinal axis 28 of the
  • FIGS. 9 and 10 show further possible embodiments of cutting heads 12 ', 12 ".
  • the cutting bodies 18 'shown in FIG. 9 are plate-shaped cutting bodies made of CBN, which are individually soldered onto the sleeve 16'.
  • the cutting body 18 "shown in Fig. 10 is suitable, for example, for a cutter for grooving.

Abstract

La présente invention concerne un outil (10) d'usinage d'une pièce par enlèvement de copeaux, comprenant une cage de filière (12), laquelle possède une douille (16) et un corps taillant(18) fixé au niveau de la douille (16), et comprenant un élément de maintien (14) auquel la cage de filière (12) peut être fixée de manière amovible. Dans l'état monté de l'outil (10), la cage de filière (12) et l'élément de maintien (14) sont vissés l'un avec l'autre par le biais d'un filetage femelle (40) disposé à l'intérieur de la douille (16) et d'un filetage mâle (42) correspondant à celui-ci disposé sur l'élément de maintien (14). De plus, la cage de filière (12) et l'élément de maintien (14), dans l'état monté de l'outil (10), sont en contact mutuel le long d'une première surface d'appui axiale (36) disposée au niveau de la douille (16) et d'une deuxième surface d'appui axiale (38), correspondant à celle-ci, disposée au niveau de l'élément de maintien (14), ainsi que le long d'une première surface d'appui conique (44) disposée au niveau de la douille (16) et d'une deuxième surface d'appui conique (46), correspondant à celle-ci, disposée au niveau de l'élément de maintien (14).
EP18808001.4A 2017-11-24 2018-11-23 Outil d'usinage d'une pièce par enlèvement de copeaux Pending EP3713700A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017127814.1A DE102017127814A1 (de) 2017-11-24 2017-11-24 Werkzeug zur spanenden Bearbeitung eines Werkstücks
PCT/EP2018/082408 WO2019101943A1 (fr) 2017-11-24 2018-11-23 Outil d'usinage d'une pièce par enlèvement de copeaux

Publications (1)

Publication Number Publication Date
EP3713700A1 true EP3713700A1 (fr) 2020-09-30

Family

ID=64457021

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18808001.4A Pending EP3713700A1 (fr) 2017-11-24 2018-11-23 Outil d'usinage d'une pièce par enlèvement de copeaux

Country Status (9)

Country Link
US (1) US11801562B2 (fr)
EP (1) EP3713700A1 (fr)
JP (1) JP7266033B2 (fr)
CN (1) CN111479644A (fr)
CA (1) CA3079631A1 (fr)
DE (1) DE102017127814A1 (fr)
MX (1) MX2020005185A (fr)
RU (1) RU2739266C1 (fr)
WO (1) WO2019101943A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11351620B2 (en) * 2016-04-15 2022-06-07 Mapal Fabrik für Praäzisionswerkzeuge Dr. Kress KG Milling head for a ball track milling cutter, ball track milling cutter having a milling head of this type, method for producing a cutting edge for a ball track milling cutter, computer program product for carrying out a method of this type, data carrier having a computer program product of this type, and grinding machine for carrying out the method
DE102017206144B3 (de) 2017-03-16 2018-07-26 MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG Fräskopf für einen Kugelbahnfräser und Kugelbahnfräser mit einem solchen Fräskopf
CN115464728A (zh) * 2022-08-29 2022-12-13 湖南银山竹业有限公司 一种适于组合式餐具手柄开槽机的刀具

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Also Published As

Publication number Publication date
JP7266033B2 (ja) 2023-04-27
WO2019101943A1 (fr) 2019-05-31
US11801562B2 (en) 2023-10-31
JP2021504159A (ja) 2021-02-15
DE102017127814A1 (de) 2019-05-29
US20200254531A1 (en) 2020-08-13
CA3079631A1 (fr) 2019-05-31
MX2020005185A (es) 2020-08-17
RU2739266C1 (ru) 2020-12-22
CN111479644A (zh) 2020-07-31

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