Preparation method for large-size hard alloy

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...

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 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 by isostatic pressing, the cost is high and the delivery cycle is long, which cannot meet customer needs

Moreover, when the isostatic pressing method is adopted, the grinding amount is more than 50%, and the cost of mold making is relatively high, resulting in extremely high production costs.

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