Preparation method for large-size hard alloy

A cemented carbide, large-size technology, applied in the field of large-size cemented carbide preparation, can solve the problems of long mold making cycle, long product production cycle, long delivery cycle, etc., so as to reduce mold occupation time and shorten production cycle. , the effect of strengthening the degree of toughness

Active Publication Date: 2016-12-14
河源富马硬质合金股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production of isostatic pressing, there are the following disadvantages: 1. The product mold production cycle is long, and a set of isostatic pressing molds takes 15 to 20 days from production to trial production; 2. The mold is expensive, and a set of isostatic pressing molds The price of the product is generally above 6,000 yuan; 3. The product production cycle is long
Therefore, the isostatic pressing method in the prior art is general

Method used

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  • Preparation method for large-size hard alloy

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Effect test

Embodiment 1

[0022] A preparation method of large-scale cemented carbide, comprising the following steps:

[0023] S1. Pretreatment of raw materials, cleaning the raw materials, removing the attached pollutants on the surface, and then using pickling to remove the oxides on the surface;

[0024] S2. Flux removes impurities, melts oxides composed of alloy components in a crucible, and then melts the raw materials that have been removed from the surface into oxides. During this process, the molten state temperature of oxides is maintained at Tg temperature, and stay the same;

[0025] S3. For pouring, after all the raw materials are dissolved, reduce the temperature of the oxide molten state to Tx temperature, the average cooling rate is 10°C / min, and stand for 2 hours, the temperature remains unchanged, remove the pure molten material in the lower layer, and melt Put the material into the water-cooled copper mold. During the pouring process, keep the temperature of the water-cooled copper ...

Embodiment 2

[0030] A preparation method of large-scale cemented carbide, comprising the following steps:

[0031] S1. Pretreatment of raw materials, cleaning the raw materials, removing the attached pollutants on the surface, and then using pickling to remove the oxides on the surface;

[0032] S2. Flux removes impurities, melts oxides composed of alloy components in a crucible, and then melts the raw materials that have been removed from the surface into oxides. During this process, the molten state temperature of oxides is maintained at Tg temperature, and stay the same;

[0033] S3, pouring, after all the raw materials are dissolved, reduce the temperature of the molten oxide to Tx temperature, the average cooling rate is 10°C / min, and let it stand for 2.5 hours, the temperature remains unchanged, remove the pure molten material in the lower layer, and melt Put the material into the water-cooled copper mold. During the pouring process, keep the temperature of the water-cooled copper m...

Embodiment 3

[0038] A preparation method of large-scale cemented carbide, comprising the following steps:

[0039] S1. Pretreatment of raw materials, cleaning the raw materials, removing the attached pollutants on the surface, and then using pickling to remove the oxides on the surface;

[0040] S2. Flux removes impurities, melts oxides composed of alloy components in a crucible, and then melts the raw materials that have been removed from the surface into oxides. During this process, the molten state temperature of oxides is maintained at Tg temperature, and stay the same;

[0041] S3, pouring, after all the raw materials are dissolved, reduce the temperature of the molten oxide to Tx temperature, the average cooling rate is 10°C / min, and let it stand for 3 hours, the temperature remains unchanged, remove the pure molten material of the lower layer, and melt Put the material into the water-cooled copper mold. During the pouring process, keep the temperature of the water-cooled copper mol...

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Abstract

The invention discloses a preparation method for a large-size hard alloy. The preparation method includes the following steps that S1, raw material preprocessing is conducted so that surface sundries and oxide can be removed; S2, fluxing agent impurity removal is conducted so that impurities in internal melt can be extracted out; S3, pouring is conducted, the melt is placed in a water-cooled copper mold, and after pouring is completed, the water-cooled copper mold enters a water tank to be suddenly cooled, and a blank is obtained; S4, the blank is taken, ground and formed, the blank is taken out and ground, a rough blank is obtained, and the rough blank is pressed; and S5, sintering is conducted, wherein secondary vacuum sintering is conducted on the rough blank, temperature and pressure are regulated in the secondary vacuum sintering process, a large-size hard alloy finished product is obtained, raw materials are purified, other nodules are prevented from appearing in the forming process, grinding is conducted after the blank is obtained, secondary sintering and die pressing are conducted after grinding is conducted, holes are further removed, and on the premise that the large size is ensured, the predicted rigid degree of the hard alloy is reached, the production period is shortened, the die occupation time is shortened, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the field of hard alloy preparation technology, in particular to a method for preparing large-size hard alloy. Background technique [0002] At present, for cemented carbide products with large length and large volume, the methods adopted consistently at home and abroad are isostatic pressing production and vacuum sintering. In the production of isostatic pressing, there are the following disadvantages: 1. The product mold production cycle is long, and a set of isostatic pressing molds takes 15 to 20 days from production to trial production; 2. The mold is expensive, and a set of isostatic pressing molds The price of the product is generally more than 6,000 yuan; 3. The product production cycle is long. Therefore, the isostatic pressing method in the prior art is generally only applied in mass production. [0003] However, for large-size cemented carbide products with a small number of orders, if the production is carried out...

Claims

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Application Information

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IPC IPC(8): C22C1/10
CPCC22C1/1036C22C1/1047
Inventor 王忠平黄伟郭光富蔡家礼董纯洁李章序
Owner 河源富马硬质合金股份有限公司
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