EP1581663B1 - Corps moule de metal dur - Google Patents

Corps moule de metal dur Download PDF

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Publication number
EP1581663B1
EP1581663B1 EP03815057A EP03815057A EP1581663B1 EP 1581663 B1 EP1581663 B1 EP 1581663B1 EP 03815057 A EP03815057 A EP 03815057A EP 03815057 A EP03815057 A EP 03815057A EP 1581663 B1 EP1581663 B1 EP 1581663B1
Authority
EP
European Patent Office
Prior art keywords
weight
binder
carbide
screwdriver bit
hard metal
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
EP03815057A
Other languages
German (de)
English (en)
Other versions
EP1581663A2 (fr
Inventor
Heinz Westermann
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 Deutschland GmbH
Original Assignee
Ceratizit Deutschland GmbH
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Publication date
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Publication of EP1581663A2 publication Critical patent/EP1581663A2/fr
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Publication of EP1581663B1 publication Critical patent/EP1581663B1/fr
Anticipated expiration legal-status Critical
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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

Definitions

  • the invention relates to a screwdriver bit (bit) containing a tungsten carbide hard metal.
  • Carbide moldings and in particular screwdriver tips are currently made of steel alloys. Due to the low wear resistance of this material, there is a high demand for more wear resistant materials. As wear-resistant materials, carbides are generally available because of their high hardness and high wear resistance.
  • binders for tungsten carbide also complex binder alloys are used in recent times. These alloys consist of tungsten carbide like the classic hard metals; however, the cobalt binder is replaced by a complex binder alloy consisting essentially of iron, cobalt and nickel.
  • CERMETS sintered hard metal shaped bodies
  • Co-Ni-Fe binders consisting of about 40 to 90% by weight cobalt and the remainder consisting essentially of nickel and iron, the contents of nickel and iron each being at most 36% by weight be with a Ni: Fe ratio of about 1.5: 1 to 1: 1.5.
  • Such cemented carbide bodies find use as cutting inserts and indexable inserts, but are less suitable as material for screwdriver tips because of only very low torque resistance.
  • tungsten carbide hard metal alloys which contain an alloy binder of iron, cobalt and nickel. So will in DE 296 17 040 U1 a tungsten carbide hard material alloy with a binder system of iron, cobalt and nickel and a WC grain size ⁇ described as 1 micron, wherein the total binder content of the binder system 3 to 30 wt .-% and the proportion of iron in the binder system> than 50 wt .-% is.
  • Dissertation Prakash TU Düsseldorf 1979, p. 1, 39-41, 113-119, 199-202 describes hard metal moldings containing 80 wt .-% tungsten carbide of a particle size of about 1 micron and 20 wt .-% of a binder, wherein the binder 70 to 80 wt .-% iron, 5 to 10 wt .-% cobalt and 10 to 20 wt. - contains%.
  • the object of the invention is to provide screwdriver tips made of a material that have high strength and corrosion resistance of classic hard metal alloys with the toughness and torque resistance of steels of this type which meets the future DIN requirements for torque resistance, especially of screwdriver tips.
  • the object is achieved according to the invention by a screwdriver tip consisting of a hard metal molding consisting of 60 to 80% by weight of tungsten carbide having a particle size in the range of 0.1 ⁇ m to 6.0 ⁇ m in the sintered state and 20 to 40% by weight.
  • a binder optionally at least one carbide, nitride and / or carbonitride, of at least one of the elements of groups IVa, Va and VIa of the Periodic Table of the Chemical Elements in a total content of 0.1 to 4, in particular 0.2 to 2 wt .-%, wherein the binder contains 60 to 85% by weight of iron, 5 to 15% by weight of cobalt and 5 to 25% by weight of nickel.
  • a characteristic of the hard metal used in this way is its significantly improved ability compared to classic hard metals.
  • the toughness is determined, for example, by means of the Palmquist measurement: the K IC values determined therefrom reached values of 20 to 25 MPa ⁇ m 1/2 , while values of 15 MPa ⁇ m 1/2 are achieved in the case of classic hard metal alloys.
  • the tungsten carbide has a particle size in the range of 0.2 microns to 6.0 microns in the sintered state.
  • the high iron content and in particular the observance of the upper limit for the cobalt content are required to counteract the otherwise occurring embrittlement of the hard metal and the to obtain necessary high toughness.
  • Carbon contents in WC-Fe alloys should be in a narrow range of ⁇ 0.03 wt% to prevent embrittling phases such as Eta phases on the one hand and free carbon on the other hand. Both phases lead to a partial extreme deterioration of the toughness properties.
  • the grain sizes of the tungsten carbide in the sintered state should preferably be ultrafine to coarse, ie 0.2 to 6.0 microns. In this case, grain sizes of 0.6 to 4.0 microns are preferred. Particularly good values with respect to the impact strength (KI C value) are in this case with particle sizes in the range of 1.0 to 4.0 microns and especially with grain sizes, which are referred to as medium or coarse ( ⁇ 1.3 microns), achieved.
  • the proportion of the tungsten carbide 70 to 75 wt .-% and the binder content corresponding to 25 to 30 wt .-% is. In this way it is ensured that maximum toughness combined with high hardness is achieved.
  • the best values for a torsional strength are achieved when the binder, preferably 60 to 85, more preferably 70 to 80 wt% iron, preferably 5 to 10 wt .-% cobalt and preferably 10 to 20 wt .-% nickel. This is therefore particularly preferred.
  • the quantitative characterization of the grain sizes of WC-Co hard metals is usually carried out as a surface analysis of an etched cut (equivalent circular diameter).
  • the real image can be reconstructed via image processing, so that the particle surfaces are evaluated by means of computer programs.
  • the computer forms for each grain one of the surface of the particle corresponding circular area. The diameter of this circle is determined.
  • Carbides, nitrides or carbonitrides usually have the function of limiting the growth of the grain size of the cemented carbide.
  • a particular advantage of the present invention is that the proportion of carbides, nitrides and carbonitrides are kept particularly low can, because the grain size hardly increases in the sintering process.
  • Optimum wear resistance and hardness are achieved when the total content of the carbides, nitrides and / or carbonitrides is in the specified range, in particular if the content of vanadium carbide 0.05 to 1 wt .-%, the content of tantalum carbide 0.2% to 10 wt .-% and the content of chromium carbide 0.2 to 5 wt .-%, each based on the binder.
  • the absolute content of carbides, nitrides and carbonitrides is in each case dependent on the particular binder and is therefore stated in% by weight, based on the binder.
  • the hard metals described above can be used in principle as a material in applications in which a similar optimization of wear resistance, hardness and toughness or torque resistance are required. Such applications are, for example, screwdriver tips.
  • the screwdriver tips according to the invention only in the application area (head) consists of the hard metal molding, or for example, has a hard metal coating on steel.
  • a tungsten carbide (head) application may be soldered to a carrier.
  • a screwdriver tip that consists of the hard metal for example, is produced by injection molding, is particularly preferred.
  • Screwdriver tips (bits) of dimension PZ2 made with a classic WC-Co alloy containing 85 wt .-% WC and 15 wt .-% Co with a grain size of WC of 2-3 microns in the sintered state, achieved in the torsion test torque values of 8 Nm. Thus, only about 70% of the nominal value according to DIN 5261 of at least 11.3 Nm were achieved.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Glass Compositions (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Claims (8)

  1. Embout tournevis consistant en une pièce frittée en métal dur constitué de 60 à 80 % en poids de carbure de tungstène ayant une granulométrie comprise entre 0,1 µm et 6,0 µm en état fritté et de 20 à 40 % en poids d'un liant, éventuellement au moins un carbure, nitrure et/ou carbonitrure d'au moins un des éléments des groupes IVa, Va et VIa dans une quantité totale de 0,1 à 4, notamment de 0,2 à 2, % en poids, le liant contenant 60 à 85 % en poids de fer, 5 à 15 % en poids de cobalt et 5 è 25 % en poids de nickel.
  2. Embout tournevis selon la revendication 1, caractérisé en ce que le carbure de tungstène a une granulométrie comprise entre 0,2 µm et 6,0 µm en état fritté.
  3. Embout tournevis selon la revendication 1 ou 2, caractérisé en ce que le liant contient 70 à 80 % en poids de fer, 5 à 10 % en poids de cobalt et 10 à 20 % en poids de nickel.
  4. Embout tournevis selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la granulométrie du carbure de tungstène en état fritté est de 1,0 à 4,0 µm, notamment au moins 1,3 µm.
  5. Embout tournevis selon la revendication 1, caractérisé en ce que l'alliage de la pièce frittée en métal dur contient 0,05 à 1 % en poids de carbure de vanadium par rapport au liant.
  6. Embout tournevis selon la revendication 1, caractérisé en ce que l'alliage de la pièce frittée en métal dur contient 0,2 à 10 % en poids de carbure de tantale par rapport au liant.
  7. Embout tournevis selon la revendication 1, caractérisé en ce que l'alliage de la pièce frittée en métal dur contient 0,2 à 5. % en poids de carbure de chrome par rapport au liant.
  8. Embout tournevis selon l'une quelconque des revendications 1 à 7, contenant un revêtement au niveau de la surface de travail.
EP03815057A 2003-01-09 2003-12-18 Corps moule de metal dur Expired - Lifetime EP1581663B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10300420A DE10300420A1 (de) 2003-01-09 2003-01-09 Hartmetallformkörper
DE10300420 2003-01-09
PCT/EP2003/014485 WO2004063408A2 (fr) 2003-01-09 2003-12-18 Corps moule de metal dur

Publications (2)

Publication Number Publication Date
EP1581663A2 EP1581663A2 (fr) 2005-10-05
EP1581663B1 true EP1581663B1 (fr) 2011-02-16

Family

ID=32519730

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03815057A Expired - Lifetime EP1581663B1 (fr) 2003-01-09 2003-12-18 Corps moule de metal dur

Country Status (6)

Country Link
EP (1) EP1581663B1 (fr)
AT (1) ATE498702T1 (fr)
AU (1) AU2003296673A1 (fr)
DE (2) DE10300420A1 (fr)
ES (1) ES2361165T3 (fr)
WO (1) WO2004063408A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1805338B1 (fr) * 2004-10-29 2017-05-03 SECO TOOLS AB (publ) Carbure metallique fritté
DE102016207028A1 (de) * 2016-04-26 2017-10-26 H.C. Starck Gmbh Hartmetall mit zähigkeitssteigerndem Gefüge

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3816081A (en) * 1973-01-26 1974-06-11 Gen Electric ABRASION RESISTANT CEMENTED TUNGSTEN CARBIDE BONDED WITH Fe-C-Ni-Co
RU2096513C1 (ru) * 1991-04-10 1997-11-20 Сандвик Актиеболаг Способ получения спеченного изделия из твердого сплава
SE513740C2 (sv) * 1995-12-22 2000-10-30 Sandvik Ab Slitstark hårmetallkropp främst för användning vid bergborrning och mineralbrytning
DE29617040U1 (de) * 1996-10-01 1997-01-23 United Hardmetal GmbH, 72160 Horb WC-Hartlegierung
DE19907749A1 (de) * 1999-02-23 2000-08-24 Kennametal Inc Gesinterter Hartmetallkörper und dessen Verwendung

Also Published As

Publication number Publication date
DE50313479D1 (de) 2011-03-31
WO2004063408A3 (fr) 2004-11-11
ES2361165T3 (es) 2011-06-14
DE10300420A1 (de) 2004-07-22
AU2003296673A1 (en) 2004-08-10
EP1581663A2 (fr) 2005-10-05
WO2004063408A2 (fr) 2004-07-29
ATE498702T1 (de) 2011-03-15

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