As can be seen from Table 1, the powder metallurgy high-speed steel has excellent performance, high strength, high hardness, high toughness, high wear resistance, and good processability. It is a kind of cemented carbide and high speed. New materials between steel. Since the cutting performance of the tool made of powder metallurgy high-speed steel completely surpasses the original high-speed steel in all the cutting processing fields, its toughness is superior to that of the whole solid carbide tool and is increasingly favored by the tool industry.
3. The grade, composition and conventional heat treatment process of powder metallurgy high speed steel
Due to the complexity of the smelting process and the high manufacturing cost, powder metallurgy high-speed steel is produced in only a few developed countries such as Sweden, the United States, Austria, France, Japan and Russia. Due to the small amount of powder metallurgy, there is no enterprise in China to produce powder metallurgy high-speed steel. However, with the development of machinery manufacturing and the transfer of international machinery manufacturing to China, it is believed that the production of powder metallurgy in China will come quickly. Table 2 shows the powder metallurgy high speed steel grades, compositions and heat treatment processes in several countries.
4. Progress in powder metallurgy high speed steel
Since the production of powder metallurgy high-speed steel, due to the continuous optimization and improvement of its preparation technology, new progress has been made in quality and characteristics, which has evolved from the first generation in the 1970s to the second generation in the 1990s. Developed to the third generation of the early 21st century. From Table 3 we can understand the different preparation techniques and performance characteristics of the three generations of powder metallurgy high speed steel.
5. Application of powder metallurgy high speed steel
Powder metallurgy high speed steel has excellent toughness and machinability, good red hardness, high compressive strength and high wear resistance, high alloy content, high purity without segregation, fine carbide particles and each It is widely applied to the same-same characteristics. It is used as a tool for processing non-ferrous metals such as titanium and aluminum alloys. It is used as a tool for machining gear milling cutters, hobs, pinion cutters, shaving cutters, etc. It can also be used as side milling cutters, forming cutters and broaches. Also commonly used in the manufacture of twist drills, machine taps, reamers, etc. Used in the saw blade industry as a band saw bimetallic strip, as a precision punching tool and in the manufacture of punch dies, and in other mold making. Since powder metallurgy is more expensive (generally 4 to 8 times that of ordinary high-speed steel), powder metallurgy high-speed steel is often used to manufacture tools for sophisticated tools or CNC machine tools, taking into account cost factors.
The performance of cutting tools made of powder metallurgy high-speed steel is better than that of ordinary high-speed steel. The service life is higher than that of ordinary high-speed steel (generally 2 to 3 times), and it can replace cemented carbide tools in cutting occasions with large impact load. Therefore, powder metallurgy high-speed steel The application prospects in the tool industry are very promising, and more and more people are paying attention.
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