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Pressing method of cemented carbide ball

A technology of cemented carbide and hard particles is applied in the field of pressing of cemented carbide balls, which can solve the problems of affecting the fluidity of cemented carbide balls, affecting the performance of cemented carbide balls, and inclusion of irregularly shaped particles, etc. The effect of physical performance degradation, uniform force, and improved product quality

Active Publication Date: 2015-09-02
ZIGONG TUNGSTEN CARBIDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The alumina particles are relatively large, and during the pressing process, pits will appear on the surface of the balls due to extrusion, and even the cemented carbide balls will be crushed.
This will cause the finished cemented carbide balls to contain irregular particles or incomplete particles or even broken particles, which will seriously affect the flow properties of cemented carbide balls and affect the performance of cemented carbide balls.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The pressing method of tungsten carbide-cobalt cemented carbide balls (tungsten carbide is hard particles, cobalt is binder), including the following:

[0032] (1) Put the semi-finished tungsten carbide-cobalt cemented carbide ball and 200-mesh tungsten carbide (WC) into the elastic rubber sleeve specially used for cold isostatic pressing according to the volume ratio of 2:1, and use the rubber plug matched with the rubber sleeve to carbonize The tungsten-cobalt cemented carbide ball and WC are sealed well, put into the special hanging basket for pressing, and then put into the cold isostatic press for pressing;

[0033] (2) After keeping the pressure at 120MPa for 1-5 minutes, start to release the pressure. After the pressure is 0, take out the rubber sleeve, open the rubber plug, and discharge the mixture of tungsten carbide-cobalt cemented carbide ball semi-finished products and WC filler;

[0034] (3) Then use a 100-mesh or 200-mesh vibrating screen to separate the ...

Embodiment 2

[0036] The pressing method of chromium carbide-nickel carbide balls (chromium carbide is the hard particle, nickel is the binder), including the following:

[0037] (1) Put the semi-finished chromium carbide-nickel carbide ball and chromium carbide into the elastic rubber sleeve specially used for cold isostatic pressing according to the volume ratio of 4:1, and use the rubber plug matched with the rubber sleeve to seal the chromium carbide-nickel hard alloy The alloy ball and the chromium carbide are sealed well, put into the special hanging basket for pressing, and then put into the cold isostatic press for pressing;

[0038] (2) After holding the pressure for 1-5 minutes under the pressure of 200MPa, start to release the pressure. After the pressure is 0, take out the rubber sleeve, open the rubber plug, and discharge the mixture of chromium carbide-nickel carbide ball semi-finished products and chromium carbide filler;

[0039] (3) Use a 50-mesh or 100-mesh vibrating scree...

Embodiment 3

[0041] The pressing method of molybdenum carbide-cobalt cemented carbide balls (molybdenum carbide is the hard particle, cobalt is the binder), including the following:

[0042] (1) Put the semi-finished molybdenum carbide-cobalt cemented carbide ball and molybdenum carbide into the elastic rubber sleeve specially used for cold isostatic pressing according to the volume ratio of 3:1, and seal the molybdenum carbide-cobalt hard alloy ball with the rubber plug matched with the rubber sleeve. The alloy ball and molybdenum carbide are sealed well, put into the special hanging basket for pressing, and then put into the cold isostatic press for pressing;

[0043] (2) After holding the pressure for 3 minutes under the pressure of 130MPa, start to release the pressure. After the pressure is 0, take out the rubber sleeve, open the rubber plug, and discharge the mixture of molybdenum carbide-cobalt cemented carbide ball semi-finished products and molybdenum carbide filler;

[0044] (3) ...

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Abstract

The invention provides a method for pressing cemented carbide balls, and relates to the technical field of cemented carbide manufacturing. In the method provided by the present invention, the pressing method of isostatic pressing is adopted, and the filler selected during pressing is at least one carbide hard particle included in the cemented carbide ball raw material. With the pressing method provided by the invention, no other impurities are introduced in the pressing, and the decline in the physical performance of the product due to doping can be avoided; the pressed hard alloy ball has a uniform density distribution, and its hardness, wear resistance, and strength are uniform. , toughness, heat resistance, corrosion resistance and a series of properties have been greatly improved.

Description

technical field [0001] The invention belongs to the technical field of hard alloy manufacture, and in particular relates to a pressing method of hard alloy balls. Background technique [0002] Cemented carbide refers to an alloy material made of hard compounds of refractory metals and bonding metals through powder metallurgy. Tungsten carbide ball is an important high-hardness material for surface materials and surface technology. It is combined with the base material by surfacing welding to meet the functional requirements of wear resistance and corrosion resistance, and to prolong the service life of equipment and workpieces. At present, the common cemented carbide refers to two main components composed of tungsten carbide (WC) and cobalt (Co), the highest hardness can reach 1700HV (100g load), while high hardness, it also has good wear resistance and corrosion resistance performance. In many cases, other hard particles including, for example, carbides of titanium, vanad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/02B22F3/04
Inventor 韩萌李玉玺黄维黄芳跃
Owner ZIGONG TUNGSTEN CARBIDE
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