Mold and method for preparing hard alloy hollow sphere

Abstract

The invention relates to a mold and a method for preparing a hard alloy hollow sphere. The mold consists of an upper mold, a lower mold and an outer sleeve for fixing the upper mold and the lower mold. The whole weight and density of the hollow sphere are controlled and changed in a large range, and raw materials are obviously saved; a high-accuracy steel forming mold and radial toothed end faces are adopted, so that the wall thickness of the hollow sphere can be accurately controlled, and weight eccentricity is avoided; the area and connection strength of a sintering and soldering surface are increased, so that the compression strength and impact strength of the hollow sphere are greatly improved; and the process is simple, high in yield, easy to popularize and suitable for industrial mass production, and economic benefits and social benefits are obvious.

Description

technical field [0001] The invention belongs to the technical field of preparation of hollow spherical parts in cemented carbide materials. In particular, a cemented carbide hollow sphere mold and a preparation method suitable for industrial production of various cemented carbide hollow sphere parts are provided. Background technique [0002] Cemented carbide plays an extremely important role and position in the national economy, such as in machinery manufacturing industry, petroleum industry, mining industry, transportation industry, computer manufacturing, textile, medical treatment, artificial diamond production, high-pressure synthesis of polyethylene raw materials, etc. Almost all industrial sectors of the national economy. [0003] In recent years, the one-way valve at the bottom of the pumping well in the petroleum industry has begun to use a large number of carbide sphere parts. In the manufacture of mechanical parts, high-speed rolling bearings using cemented carb...

AI Technical Summary

Problems solved by technology

[0005] Although the first method is easy to produce hollow spheres, the relative density of hollow spheres is too low (28% to 30%), the surface finish and dimensional accuracy are poor, the sintering deformation is serious, the dewaxing time is long, and the reject rate is too high. High, low production efficiency, low mechanical strength, not suitable for industrial mass production

[0006] The second method is mainly a core ball with a low melting point. After melting, it must be released through a hole somewhere in the spherical shell. In addition, the surface of the spherical shell is generally not a standard spherical surface, and it still needs machining to make a spherical blank. This method The biggest disadvantage is that the deformation of the core ball is difficult to control, and it is easy to cause uneven wall thickness of the ball, and finally easy to cause weight eccentricity. Therefore, the production efficiency of this method is very low, the consumption of raw materials is large, and the yield is not high, so it is not suitable for for mass production

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