How to efficiently process cemented carbide?

Cemented carbide has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance and corrosion resistance, especially its high hardness and wear resistance, which remain basically unchanged even at a temperature of 500°C, It still has high hardness at 1000℃.

Cemented carbide has high hardness, strength, wear resistance and corrosion resistance, and is known as "industrial teeth". It is used to manufacture cutting tools, knives, cobalt tools and wear-resistant parts. With the development of downstream industries, hard The market demand for high-quality alloys continues to increase. In the future, the manufacturing of high-tech weapons and equipment, the advancement of cutting-edge science and technology, and the rapid development of nuclear energy will greatly increase the demand for high-tech and high-quality and stable cemented carbide products.

Hard alloy processing problems

Due to the high melting point and brittleness of cemented carbide, it is necessary to have sufficient pulse current density to be processed, but coarser processing standards cannot be used. Electrode materials such as copper, graphite, etc. will have large losses when the existing pulse power source is used for medium and precise machining with a smaller pulse width.

According to the existing qualitative theory of low-loss processing, the ratio of peak current to pulse width should be made ≤A (A is a constant, such as copper processing steel, A≤0.1A/μs), but the electric pulse with this parameter is used to process hard High-quality alloys are often of practical significance due to their low productivity.

Cemented carbide machining strategy

From the principle of EDM, any conductive material can be processed, and it is also possible to achieve low-loss processing, and cemented carbide is no exception. However, at present, according to the qualitative theory of low loss, when ≤0.01 A/μs is selected, it has the phenomenon of carbon adsorption, and the effect of low loss processing can be obtained. In order to improve the processing productivity, the no-load voltage amplitude can be increased to expand the spark gap value under a given processing surface roughness condition, improve the chip removal conditions, and reduce the pulse stop time accordingly.