EP1534871B1 - Utilisation d'un alliage de metaux durs - Google Patents

Utilisation d'un alliage de metaux durs Download PDF

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Publication number
EP1534871B1
EP1534871B1 EP03790536A EP03790536A EP1534871B1 EP 1534871 B1 EP1534871 B1 EP 1534871B1 EP 03790536 A EP03790536 A EP 03790536A EP 03790536 A EP03790536 A EP 03790536A EP 1534871 B1 EP1534871 B1 EP 1534871B1
Authority
EP
European Patent Office
Prior art keywords
screwdriver
hard metal
metal alloy
tungsten carbide
cobalt
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.)
Expired - Lifetime
Application number
EP03790536A
Other languages
German (de)
English (en)
Other versions
EP1534871A1 (fr
Inventor
Alfred Bernhard
Ronald Huber
Alfred Knittel
Michael Schretter
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.)
Ceratizit Austria GmbH
Original Assignee
Ceratizit Austria 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 Ceratizit Austria GmbH filed Critical Ceratizit Austria GmbH
Publication of EP1534871A1 publication Critical patent/EP1534871A1/fr
Application granted granted Critical
Publication of EP1534871B1 publication Critical patent/EP1534871B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING
    • B25B15/00—Screwdrivers
    • B25B15/001—Screwdrivers characterised by material or shape of the tool bit
    • B25B15/002—Screwdrivers characterised by material or shape of the tool bit characterised by material used or surface finishing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy

Definitions

  • the invention relates to the use of a hard metal alloy for screwdriver bits.
  • Such screwdriver bits are often referred to as screwdriver bits are received in a holder or directly in the screwing tool and usually have a hexagonal-shaped receiving shaft and a tip, also referred to as the output, on.
  • the shape or profile of the tip is matched to the head shape of the screw to be screwed.
  • screws with slotted heads, with Phillips heads of different shapes, and with inner Torx heads are widely used.
  • the screwdriver bits are primarily made of steel, which is usually cured to a hardness between 54 and 62 HRC. At this hardness, such screwdriver bits made of steel usually have sufficient toughness to accommodate the stress occurring during the screwing on torsion without damage.
  • the JP 02 204592 A , the DE 296 17 040 U as well as the US-A-4753678 describe fine-grained tungsten carbide hard metal alloys as the main constituent with cobalt binder or with a binder system of iron, cobalt and nickel.
  • drilling tools or cutting tools which operate at high speeds or high cutting speeds and which do not have to transmit high torques and are primarily claimed for mechanical wear and only to a small extent on Torosion ,
  • the FR-A-2 469 250 describes more generally a carbide material such as tungsten carbide without further details of the exact composition for the production of specially designed screwdriver bits.
  • the object of the present invention is to provide for screwdriver bits, a material that exceeds the previously known materials for such applications in its properties.
  • this is achieved by using a hard metal alloy consisting essentially of tungsten carbide with an average particle size of less than 1.2 ⁇ m and from 13 to 23% by weight binder metal selected from one or more metals from the group of cobalt, iron and nickel.
  • This special hard metal alloy brings significant improvements in wear resistance and at the same time excellent results in terms of torsional strength. This was surprising in particular because not particularly hard carbide alloys, as expected, have good torsional strength, but rather an alloy group which has only below-average values with regard to toughness.
  • the torsional strength depending on the specific shape and size of the manufactured part is in the range of 1,800 to 2,400 N / mm 2 .
  • the alloy consists essentially of tungsten carbide means that minor amounts of other hard materials, in particular other carbides, of the order of up to about 10% by weight may be present in the alloy without significantly changing the advantageous properties.
  • a cemented tungsten carbide hard metal alloy having a mean grain size in the range from 0.7 to 0.9 ⁇ m and from 13 to 17% by weight cobalt binder has proven particularly suitable for the use according to the invention.
  • An advantageous order of magnitude has proven to be a proportion of up to 200 grains / mm 2 with a mean particle size in the range of 6 to 15 ⁇ m.
  • the formation of the coarse grain fraction is effected by a slight sintering of the hard metal alloy during production. Without forming a coarse grain fraction sintering of the hard metal alloy according to the invention takes place at a temperature of about 1400 ° C, during a period of about 60 minutes.
  • the sintering to form the coarse grain fraction is achieved by increasing the sintering temperature to about 1440 ° C and extending the sintering time to about 90 minutes.
  • granules are produced from the hard metal powder mixture and an organic binder, such as waxes or polymers, by mixing and heated in an injection molding machine to temperatures between about 100 and 200 ° C and injected through a press into correspondingly executed molds. After cooling the mixture, the blanks, which already have excellent strength, are ejected from the injection mold and then debinded in respective ovens and sintered to form a liquid phase of the binder metal portion.
  • the resulting volumetric shrinkage is on the order of about 50%, the achieved sintering density at nearly 100% of the theoretical density.
  • targeted fillets can be incorporated in the injection mold on particularly vulnerable edges on the screwdriver bit, which allows high torques to be transmitted without breakage hazard due to the reduced notch effect on the screwdriver bit.
  • the metal powder injection molding alone by a specific surface finish of the injection mold allows a particularly structured design of the profile surface of the screwdriver bit, through which even with a lower contact force of the screwdriver bit slipping it can be largely prevented from the screw head, whereby the service life of the screwdriver bit is extended.
  • An additional enhanced effect in this direction can be achieved through the Incorporation of ultrahard particles, eg diamond grains, in the course of the injection molding process in the injection mold reach.
  • rod-shaped samples of a hard metal alloy according to the invention referred to as samples 1 in Table 1, were prepared from 85% by weight tungsten carbide with a mean grain size of 0.7 ⁇ m, balance cobalt.
  • the samples had a hexagonal profile with a cylindrical central part.
  • the total length of the samples was 38 mm with a key width of the hexagonal profile of 5 mm.
  • the cylindrical center portion of the samples had a length of 16 mm and a diameter of 3.8 mm.
  • the resulting cross section of the central part corresponds approximately to the shear cross section of the screwdriver bits most frequently used in practice.
  • a block with the dimensions 70 mm x 46 mm x 25 mm was prepared by pressing the powder mixture of the hard metal alloy according to the invention with a pressure of 220 MPa.
  • the samples were cut with their hexagon basic shape from the middle part by means of diamond discs. Then the samples were sintered at 1420 ° C for 60 minutes.
  • Sample 5 Similar samples of hardened steel, referred to as Sample 5 in Table 1, were prepared.
  • the steel had a composition customary for the production of screwdriver bits.
  • These samples were also tested for flexural strength and torsional strength and their averages are listed in Table 1.
  • the hard metal alloy according to the invention has the best values in terms of torsional strength compared with the other hard metal alloys. Your values in the Torsional strength is comparable to the values of the steel alloy. Since carbide also has significantly better wear resistance properties compared to steel, there is a serious advantage of the hard metal alloy. It is particularly surprising that hard metal alloys with high toughness and good or even higher bending strength have worse, sometimes even significantly worse values in the torsional strength.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne l'utilisation d'un alliage de métaux durs pour des pièces qui, outre l'usure, sont soumises notamment à des contraintes de torsion. L'alliage de métaux durs est essentiellement composé de carbure de tungstène, de granulométrie moyenne inférieure à 1,2 µm, et de 13 à 23 % en poids de métal liant comportant un métal ou plusieurs métaux du groupe comptant le cobalt, le fer et le nickel.

Claims (7)

  1. Utilisation d'un alliage de métaux durs consistant essentiellement en carbure de tungstène d'une granulométrie moyenne inférieure à 1,2 µm et en 13 à 23 % en poids de liant métallique sélectionné parmi un ou plusieurs métaux du groupe formé par le cobalt, le fer et le nickel pour fabriquer des inserts de tournevis.
  2. Utilisation d'un alliage de métaux durs selon la revendication 1, caractérisée en ce que l'alliage de métaux durs se compose de carbure de tungstène d'une granulométrie moyenne comprise dans la plage de 0,7 à 0,9 µm, et de 13 à 17 % en poids de cobalt.
  3. Utilisation d'un alliage de métaux durs selon la revendication 1 ou 2, caractérisée en ce que sa teneur en gros grains peut s'élever jusqu'à 200 grains/mm2, la granulométrie moyenne étant comprise dans la plage de 6 à 15 µm.
  4. Insert de tournevis en alliage conforme à l'une des revendications 1 à 3.
  5. Procédé de fabrication d'un insert de tournevis selon la revendication 4, caractérisé en ce que la fabrication s'effectue par moulage par injection de poudres métalliques.
  6. Procédé de fabrication d'un insert de tournevis selon la revendication 5, caractérisé en ce que plusieurs surélévations parallèles en forme de tiges, dont le tracé forme un angle d'environ 45 degrés avec l'axe longitudinal de l'insert de tournevis, sont formées immédiatement sous la pointe du tournevis dans le moule de moulage par injection.
  7. Insert de tournevis fabriqué selon un procédé conforme à la revendication 6, caractérisé en ce qu'il comporte, immédiatement sous la pointe du tournevis, plusieurs rainures parallèles dont le tracé forme un angle d'environ 45° avec l'axe longitudinal de l'insert de tournevis.
EP03790536A 2002-09-02 2003-08-26 Utilisation d'un alliage de metaux durs Expired - Lifetime EP1534871B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0058002U AT6278U1 (de) 2002-09-02 2002-09-02 Verwendung einer hartmetalllegierung
AT5802002U 2002-09-02
PCT/AT2003/000244 WO2004020681A1 (fr) 2002-09-02 2003-08-26 Utilisation d'un alliage de métaux durs

Publications (2)

Publication Number Publication Date
EP1534871A1 EP1534871A1 (fr) 2005-06-01
EP1534871B1 true EP1534871B1 (fr) 2008-03-26

Family

ID=3494327

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03790536A Expired - Lifetime EP1534871B1 (fr) 2002-09-02 2003-08-26 Utilisation d'un alliage de metaux durs

Country Status (7)

Country Link
US (1) US20060037431A1 (fr)
EP (1) EP1534871B1 (fr)
AT (2) AT6278U1 (fr)
AU (1) AU2003260151A1 (fr)
DE (1) DE50309483D1 (fr)
ES (1) ES2301870T3 (fr)
WO (1) WO2004020681A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101812621A (zh) * 2010-04-22 2010-08-25 株洲硬质合金集团有限公司 一种亚微细硬质合金及其制备方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017211958A1 (de) * 2017-07-12 2019-01-17 Thyssenkrupp Ag Siebsegment mit Verschleißschutzelementen
CN212351801U (zh) 2017-12-01 2021-01-15 米沃奇电动工具公司 用于驱动紧固件的工具头
US11541516B2 (en) 2019-09-25 2023-01-03 Snap-On Incorporated Fastener retention and anti-camout tool bit

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3393722A (en) * 1966-07-19 1968-07-23 George W. Windham Bit end of tool
FR2469250A1 (fr) * 1979-11-12 1981-05-22 Defougeres Pierre Embout cruciforme pour outil de vissage
JPS61195951A (ja) * 1985-02-26 1986-08-30 Sumitomo Electric Ind Ltd 高靭性超硬合金
ES2039367T3 (es) * 1986-03-28 1993-10-01 Mitsubishi Materials Corporation Elemento de alambre de carburo cementado, a base de carburo de tungsteno.
US4778730A (en) * 1987-09-09 1988-10-18 Remgrit Corporation Method of applying non-slip coating to tools and resulting product
JPH02204592A (ja) * 1989-02-01 1990-08-14 Mitsubishi Heavy Ind Ltd 掘削用カッタ
DE69231381T2 (de) * 1991-04-10 2000-12-28 Eurotungstene Poudres S.A., Grenoble Verfahren zur herstellung zementierter karbidartikel
US5399051A (en) * 1993-08-02 1995-03-21 Aken; Douglas G. Interchangeable head boring or driving apparatus
DE29617040U1 (de) * 1996-10-01 1997-01-23 United Hardmetal GmbH, 72160 Horb WC-Hartlegierung
US6790252B2 (en) * 2001-04-18 2004-09-14 Hard Metals Partnership Tungsten-carbide articles made by metal injection molding and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101812621A (zh) * 2010-04-22 2010-08-25 株洲硬质合金集团有限公司 一种亚微细硬质合金及其制备方法

Also Published As

Publication number Publication date
WO2004020681A1 (fr) 2004-03-11
DE50309483D1 (de) 2008-05-08
US20060037431A1 (en) 2006-02-23
AT6278U1 (de) 2003-07-25
ATE390494T1 (de) 2008-04-15
ES2301870T3 (es) 2008-07-01
EP1534871A1 (fr) 2005-06-01
AU2003260151A1 (en) 2004-03-19

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