Hard alloy stress eliminating method

A cemented carbide and stress relief technology, used in metal processing equipment, grinding machines, grinding/polishing equipment, etc., can solve the problems of complex operation, low efficiency, and more energy, and achieve simple operation, elimination of residual stress, and less energy. Effect

Inactive Publication Date: 2017-11-17
GANZHOU WHISKAS ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are three main methods for eliminating stress: 1) natural aging, which eliminates stress by natural placement, which takes too long and has low efficiency; 2) thermal aging method, which is

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A cemented carbide stress relief method, which includes the following steps,

[0022] S1. The sintered cemented carbide is subjected to cryogenic treatment at a temperature of -180°C and maintained for 70 to 80 minutes; this process refines the cemented carbide grains, eliminates part of the residual stress, and improves the mechanical properties of the cemented carbide.

[0023] S2. Put the cemented carbide after cryogenic treatment into the drum, and put the grinding liquid and the grinding body in sequence, and let it stand for 30-40 minutes;

[0024] S3. The drum rotates around the central axis of the drum at a speed of 50 rpm, and the rotation time is 5 hours;

[0025] Wherein, the volume of the mixture composed of the cemented carbide, the grinding fluid and the grinding body accounts for 68-72% of the volume of the drum, which can allow the grinding body to hit the cemented carbide at a certain speed to relieve stress; the grinding body is Steel shot with a diameter of 8...

Embodiment 2

[0031] A cemented carbide stress relief method, which includes the following steps,

[0032] S1. The sintered cemented carbide is subjected to cryogenic treatment at a temperature of -160~-180℃ and kept for 70~80 minutes; this process refines the cemented carbide grains, eliminates some residual stresses, and improves the mechanical properties of the cemented carbide performance;

[0033] S2. Put the cemented carbide after cryogenic treatment into the drum, and put the grinding liquid and the grinding body in sequence, and let it stand for 30-40 minutes;

[0034] S3. The drum rotates around the central axis of the drum at a speed of 80 rpm, and the rotation time is 6 hours;

[0035] Wherein, the volume of the mixture composed of the cemented carbide, the grinding fluid and the grinding body accounts for 68-72% of the volume of the drum, which can allow the grinding body to hit the cemented carbide at a certain speed to relieve stress; the grinding body is Quartz sand with a diameter ...

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PUM

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Abstract

The invention discloses a hard alloy stress eliminating method. The hard alloy stress eliminating method includes the following steps that S1, a sintered hard alloy is subjected to subzero treatment, the temperature ranges from -160 DEG C to -180 DEG C, and treatment lasts for 70 min to 80 min; S2, the hard alloy obtained after subzero treatment is put into a roller, grinding liquid and a grinding body are sequentially put, and standing lasts for 30 min to 40 min; S3, the roller rotates around the center axis of the roller with the rotating speed ranging from 50 r/min to 100 r/min, and the rotating time ranges from 5 h to 6 h; S4, the hard alloy is taken from the roller and is cleaned through an alkali solution; and S5, the cleaned hard alloy is dried at the room temperature. Compared with the prior art, the hard alloy stress eliminating method has the beneficial effects of being good in stress eliminating effect, easy to operate and the like.

Description

Technical field [0001] The invention relates to a method for relieving the stress of hard alloy. Background technique [0002] Residual stress has a very important influence on the physical properties of cemented carbide, and will reduce the fatigue strength, service life, shape stability and corrosion resistance of cemented carbide. [0003] There are mainly three existing methods for stress relief: 1) Natural aging, which eliminates stress through natural placement, which takes too long and has extremely low efficiency; 2) Thermal aging method, which is put into a thermal aging furnace for heat treatment. It requires a lot of energy and high cost; 3) Sub-resonance method, different workpieces require different processes, and the operation is complicated. Summary of the invention [0004] The present invention is proposed in view of the above-mentioned problems in the prior art. The present invention provides a cemented carbide stress relief method with simple operation and high e...

Claims

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Application Information

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IPC IPC(8): B24B31/02C22F1/00
CPCB24B31/02C22F1/00
Inventor 王征东龚雪亮
Owner GANZHOU WHISKAS ALLOY
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