EP1534871A1 - Utilisation d'un alliage de metaux durs - Google Patents

Utilisation d'un alliage de metaux durs

Info

Publication number
EP1534871A1
EP1534871A1 EP03790536A EP03790536A EP1534871A1 EP 1534871 A1 EP1534871 A1 EP 1534871A1 EP 03790536 A EP03790536 A EP 03790536A EP 03790536 A EP03790536 A EP 03790536A EP 1534871 A1 EP1534871 A1 EP 1534871A1
Authority
EP
European Patent Office
Prior art keywords
hard metal
screwdriver
metal alloy
grain size
average grain
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.)
Granted
Application number
EP03790536A
Other languages
German (de)
English (en)
Other versions
EP1534871B1 (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

Links

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 parts which, in addition to wear, are particularly stressed on torsion.
  • Screwdriver bits which are also often referred to as screwdriver bits.
  • Screwdriver bits of this type are received in a holder or directly in the screwing tool and generally have a hexagon-shaped receiving shaft and a tip, also referred to as an output. The shape or profile of the tip is matched to the head shape of the screw to be screwed in. Screws with slotted heads, with cross-head heads of different shapes, and with internal Torx heads are particularly popular.
  • the screwdriver bits are primarily made of steel, which is usually hardened to a hardness between 54 and 62 HRC. With this hardness, such screwdriver bits made of steel generally still have sufficient toughness to absorb the stress on torsion that occurs during the screwing process without damage.
  • DE 40 29 734 C2 describes the formation of an anti-slip coating on screwdriver bits, with friction particles are applied by an electrode to the hardened work surface of the screwdriver insert.
  • Screwdriver bits made entirely of carbide have not yet been used due to concerns about insufficient torsional strength.
  • the object of the present invention is to provide a material for parts which, in addition to wear and tear in particular are also subjected to torsion, has a material which exceeds the properties of the previously known materials for such applications.
  • this is achieved by using a hard metal alloy of essentially tungsten carbide with an average grain size of less than 1.2 ⁇ m and from 13 to 23% by weight of binder metal, selected from one or more metals from the group consisting 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 particularly surprising because not particularly tough carbide alloys, as expected, have good torsional strength, but an alloy group that has only below-average toughness values.
  • the torsional strength depending on the special shape and size of the manufactured part is in the range of 1,800 to 2,400 N / mm 2 .
  • the fact that the alloy consists essentially of tungsten carbide means that small amounts of other hard materials, in particular other carbides, of an order of magnitude of up to about 10% by weight can be present in the alloy without the advantageous properties changing significantly.
  • a hard metal alloy made from tungsten carbide with an average grain size in the range from 0.7 to 0.9 ⁇ m and from 13 to 17% by weight cobalt binder has proven particularly useful for the use according to the invention.
  • a proportion of up to 200 grains / mm 2 with an average grain size in the range from 6 to 15 ⁇ m has proven to be an advantageous order of magnitude.
  • the formation of the coarse grain fraction takes place through a slight over-sintering of the hard metal alloy during manufacture. Without the formation of a coarse grain fraction, the hard metal alloy according to the invention is sintered at a temperature of approximately 1,400 ° C. for a period of approximately 60 minutes. The over-sintering to form the coarse grain fraction is achieved by increasing the sintering temperature to approximately 1,440 ° C and increasing the sintering time to approximately 90 minutes.
  • Screwdriver bits are given, torques of up to 20 Nm are transmitted on average.
  • the highest values of transferable torques are achieved if the screwdriver bits are made by metal powder injection molding.
  • a granulate is produced from the hard metal powder mixture and an organic binder, such as waxes or polymers, by mixing and this is heated in an injection molding machine to temperatures between approximately 100 and 200 ° C. and injected through a press into appropriately designed casting molds. After the mixture has cooled, the blanks, which already have excellent strength, are ejected from the injection mold and then debindered in appropriate furnaces and sintered to form a liquid phase of the binder metal component.
  • the resulting volume shrinkage is of the order of about 50%, the sintered density achieved is almost 100% of the theoretical density.
  • metal powder injection molding enables targeted rounding of particularly vulnerable edges on the screwdriver insert in the injection mold, which means that high torques can be transmitted without the risk of breakage due to the reduced notch effect on the screwdriver insert.
  • the metal powder injection molding allows a particularly structured design of the profile surface of the screwdriver insert, due to the targeted surface properties of the injection mold, which can largely prevent the screwdriver insert from slipping out of the screw head, which extends the service life of the screwdriver insert.
  • An additional intensified effect in this direction can be achieved through the Achieve the introduction of ultra-hard particles, eg diamond grains, into the injection mold during the injection molding process.
  • rod-shaped samples of a hard metal alloy according to the invention referred to as samples 1 in Table 1, were produced from 85% by weight of tungsten carbide with an average grain size of 0.7 ⁇ m, the rest being cobalt.
  • the samples had a hexagonal profile with a cylindrical middle part.
  • the total length of the samples was 38 mm with a width across flats of 5 mm.
  • the cylindrical middle part of the samples had a length of 16 mm and a diameter of 3.8 mm.
  • the resulting cross-section of the middle part corresponds approximately to the shear cross-section of the screwdriver bits most commonly used in practice.
  • a block with the dimensions 70 mm ⁇ 46 mm ⁇ 25 mm was produced on a die press by pressing the powder mixture of the hard metal alloy according to the invention with a pressure of 220 MPa.
  • samples 2 in table 1 Similar samples made of a hard metal alloy consisting of 75% by weight tungsten carbide with an average grain size of 3 ⁇ m, the rest cobalt, were referred to as samples 2 in table 1, furthermore from one Tungsten carbide alloy, consisting of 85% by weight tungsten carbide with an average grain size of 1.5 ⁇ m, the rest cobalt, referred to as sample 3 in Table 1, and finally made of a hard metal alloy consisting of 80% by weight tungsten carbide with an average grain size of 1, 5 ⁇ m, remainder cobalt, referred to as samples 4 in table 1, produced and tested like the samples from the hard metal alloy according to the invention for flexural strength and torsional strength.
  • the mean values of the strengths of these samples are also shown in Table 1.
  • Sample 5 Similar samples were made from hardened steel, referred to as Sample 5 in Table 1.
  • the steel had a composition that was customary for the production of screwdriver bits.
  • These samples were also examined for flexural strength and torsional strength and their mean values are listed in Table 1.
  • the hard metal alloy according to the invention has the best values in terms of torsional strength compared to the other hard metal alloys. Your values in the Torsional strength is comparable to the values of the steel alloy. Since hard metal also has significantly better wear resistance properties than 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 flexural strength have poorer, sometimes even significantly poorer values in 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 ñm, 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.
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 true EP1534871A1 (fr) 2005-06-01
EP1534871B1 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
WO2019012039A1 (fr) * 2017-07-12 2019-01-17 Thyssenkrupp Industrial Solutions Ag Segment de criblage muni d'éléments de protection contre l'usure

Families Citing this family (3)

* 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
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004020681A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019012039A1 (fr) * 2017-07-12 2019-01-17 Thyssenkrupp Industrial Solutions Ag Segment de criblage muni d'éléments de protection contre l'usure

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
EP1534871B1 (fr) 2008-03-26
AU2003260151A1 (en) 2004-03-19

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