CN115505776A - Hard alloy material for manufacturing engineering cutting pick and preparation method thereof - Google Patents
Hard alloy material for manufacturing engineering cutting pick and preparation method thereof Download PDFInfo
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- CN115505776A CN115505776A CN202211177866.0A CN202211177866A CN115505776A CN 115505776 A CN115505776 A CN 115505776A CN 202211177866 A CN202211177866 A CN 202211177866A CN 115505776 A CN115505776 A CN 115505776A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
- C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
- C22C1/053—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor with in situ formation of hard compounds
- C22C1/055—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor with in situ formation of hard compounds using carbon
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- 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
- C22C29/067—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 comprising a particular metallic binder
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- 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
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- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a hard alloy material for manufacturing an engineering cutting tooth and a preparation method thereof, wherein the main components of the hard alloy material are tungsten carbide and cobalt, and a trace element tantalum carbide is added, under the conditions of proper proportion and granularity, the obtained hard alloy material has high hardness and good impact toughness, bending resistance and wear resistance, and the added chromium is used for improving the alloy strength and the alloy hardness; the preparation method comprises the steps of mixing the components, ball milling, pressing, forming, sintering and other conventional powder metallurgy processes, and the obtained hard alloy product has the advantages of higher hardness, higher high temperature resistance, better chemical stability and plastic deformation resistance, longer service life and the like compared with the traditional hard alloy, and is suitable for the use requirements of engineering cutting teeth.
Description
Technical Field
The invention belongs to the technical field of hard alloy preparation, and particularly relates to a hard alloy material for manufacturing an engineering cutting pick and a preparation method thereof.
Background
Cemented carbide is an alloy material made from a hard compound of refractory metals and a binder metal by a powder metallurgy process. The hard alloy has a series of excellent performances of high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance and the like.
The traditional engineering cutting pick material is prepared by adopting a common WC raw material (single granularity range) with the cobalt content of about 8-12%. Firstly, the common WC raw material is poor in impact resistance and abrasion resistance; secondly, nitrogen-argon recycling treatment is not carried out at the sintering temperature of the traditional engineering cutting tooth; thirdly, the traditional engineering cutting pick is not subjected to cryogenic treatment after being sintered, and the internal stress remained in the engineering cutting pick is quickly released when being impacted by external force, so that the breakage of the engineering cutting pick is accelerated, and the service life is shortened.
Disclosure of Invention
In view of the problems raised by the above background art, the present invention is directed to: aims to provide a hard alloy material for manufacturing engineering cutting teeth and a preparation method thereof.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a preparation method of a hard alloy material for manufacturing an engineering cutting pick comprises the following steps,
s1, preparing raw materials in proportion
85-90% of WC, wherein the WC has three granularity ranges, namely 1-2 um, 5-8 um and 15-20 um, and the WC is subjected to high-temperature carbonization treatment;
9 to 14 percent of spherical cobalt powder,
0.2 to 2 percent of Cr powder,
0.2 to 2 percent of TaC powder,
0.1 to 0.2 percent of carbon black;
s2, mixing the raw materials in proportion, carrying out ball milling, and adding 115 DEG F paraffin and 135 DEG F paraffin in the ball milling process;
s3, performing compression molding by adopting a die pressing process;
s4, putting the product after compression molding into hard alloy sintering pressure equipment, preserving heat, and feeding nitrogen-argon in a vacuum-6 MPa circulation mode in the heat preservation process;
and S5, carrying out cryogenic treatment on the sintered product.
Further limiting, in the S1, the particle size range of the spherical cobalt powder is 3-5 um.
Further, in the step S2, the duration of ball milling is 8-20 hours.
Further limiting, in the S4, the temperature condition of heat preservation is 1430-1450 ℃, and the time condition of heat preservation is 1-2 hours.
Further limiting, in S5, the temperature condition of the deep cooling treatment is-60 ℃, and the time condition of the deep treatment is 0.5-1 hour.
The invention also provides a hard alloy material obtained by the preparation method, which comprises the following components,
85-90% of WC with the granularity range of 1-20 um after high-temperature carbonization, 9-14% of spherical cobalt powder, 0.2-2% of Cr powder, 0.2-2% of TaC powder and 0.1-0.2% of carbon black.
The invention has the beneficial effects that: the WC with various particle sizes is adopted, the filling is more uniform, the WC and the spherical cobalt powder are mixed with trace element TaC, under the conditions of proper proportion and particle size, the obtained hard alloy material has high hardness and good impact toughness, bending resistance and wear resistance, the added Cr is used for improving the alloy strength and the alloy hardness, nitrogen-argon gas is fed in a vacuum-6 MPa circulation mode during heat preservation sintering, the product quality is improved, the sintered product is subjected to cryogenic treatment, the cryogenic temperature is-60 ℃, the cryogenic time is 0.5-1 hour, the cryogenic treatment eliminates the internal stress remained in the engineering cutting tooth, the internal stress is quickly released when the external force impacts the subsequent use, and the service life of the engineering cutting tooth made of the hard alloy material is prolonged due to the early release of the internal stress.
Drawings
The invention is further illustrated by the non-limiting examples given in the accompanying drawings;
FIG. 1 is a diagram of a method of making a cemented carbide material;
fig. 2 is a composition ratio diagram of a cemented carbide material.
Detailed Description
In order that those skilled in the art can better understand the present invention, the following technical solutions are further described with reference to the accompanying drawings and examples.
In the present embodiment of the present invention,
as shown in figure 1-2, the hard alloy material for manufacturing the engineering cutting pick and the preparation method thereof adopt WC 85-90%, spherical cobalt powder 9-14%, cr powder 0.2-2%, taC powder 0.2-2% and carbon black 0.1-0.2% as raw materials, and adopt WC with three different particle size ranges to replace the existing WC with single particle size, wherein the particle size ranges are as follows, 1-2 um, 5-8 um and 15-20 um, WC with different particle sizes after high-temperature carbonization treatment is more uniformly filled, WC and the spherical cobalt powder are mixed with trace element TaC, and under the proper proportion and particle size, the obtained hard alloy material has high hardness and good impact toughness, bending resistance and wear resistance, and the added Cr is used for improving the alloy strength and the alloy hardness;
mixing the raw materials according to a ratio, and then carrying out ball milling to obtain mixed metal powder;
the metal powder is molded by mould pressing;
and then, feeding the product into a hard alloy sintering pressure device for sintering, and feeding nitrogen-argon gas in a vacuum-6 MPa circulation mode during heat preservation sintering to improve the product quality, wherein the product after sintering is subjected to cryogenic treatment, the cryogenic temperature is-60 ℃, the cryogenic duration is 0.5-1 hour, the internal stress remained in the engineering cutting tooth is eliminated by the cryogenic treatment, the internal stress is prevented from being rapidly released when being impacted by external force during subsequent use, and the service life of the engineering cutting tooth made of the hard alloy material is prolonged due to the early release of the internal stress.
The foregoing embodiments are merely illustrative of the principles of the present invention and its efficacy, and are not to be construed as limiting the invention. Those skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (6)
1. A preparation method of a hard alloy material for manufacturing an engineering cutting pick is characterized by comprising the following steps: the preparation method comprises the following steps of,
s1, preparing raw materials in proportion
85-90% of WC, wherein the WC has three granularity ranges, namely 1-2 um, 5-8 um and 15-20 um, and the WC is subjected to high-temperature carbonization treatment;
9 to 14 percent of spherical cobalt powder,
0.2 to 2 percent of Cr powder,
0.2 to 2 percent of TaC powder,
0.1 to 0.2 percent of carbon black;
s2, mixing the raw materials in proportion, carrying out ball milling, and adding 115 DEG F paraffin and 135 DEG F paraffin in the ball milling process;
s3, performing compression molding by adopting a die pressing process;
s4, putting the product after compression molding into hard alloy sintering pressure equipment, preserving heat, and feeding nitrogen-argon in a vacuum-6 MPa circulation mode in the heat preservation process;
and S5, carrying out cryogenic treatment on the sintered product.
2. The hard alloy material for manufacturing engineering picks and the preparation method thereof according to claim 1 are characterized in that: in the S1, the particle size range of the spherical cobalt powder is 3-5 um.
3. The hard alloy material for manufacturing engineering picks and the preparation method thereof according to claim 2 are characterized in that: in the S2, the duration of ball milling is 8-20 hours.
4. The hard alloy material for manufacturing engineering picks and the preparation method thereof according to claim 3 are characterized in that: in the S4, the temperature condition of heat preservation is 1430-1450 ℃, and the time condition of heat preservation is 1-2 hours.
5. The hard alloy material for manufacturing engineering picks and the preparation method thereof according to claim 4 are characterized in that: in S5, the temperature condition of the deep cooling treatment is-60 ℃, and the time condition of the deep treatment is 0.5-1 hour.
6. A cemented carbide material obtained by the production method according to any one of claims 1 to 5, characterized in that: the cemented carbide material comprises the following components,
after high-temperature carbonization, the granularity range of WC is between 85 and 90 percent of 1 to 20um, the spherical cobalt powder is between 9 and 14 percent, the Cr powder is between 0.2 and 2 percent, the TaC powder is between 0.2 and 2 percent, and the carbon black is between 0.1 and 0.2 percent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211177866.0A CN115505776A (en) | 2022-09-22 | 2022-09-22 | Hard alloy material for manufacturing engineering cutting pick and preparation method thereof |
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| CN202211177866.0A CN115505776A (en) | 2022-09-22 | 2022-09-22 | Hard alloy material for manufacturing engineering cutting pick and preparation method thereof |
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| CN113416877A (en) * | 2021-06-22 | 2021-09-21 | 株洲鑫品硬质合金股份有限公司 | Metal processing high-performance hard alloy and preparation method thereof |
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2022
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