Cemented carbide milling cutters are generally made of cemented carbide round bars. They are generally manufactured with CNC tool grinders as processing equipment and diamond grinding wheels as processing tools. They are manufactured by computer or G-code editing processing routes at one time. This processing method has the advantages of high efficiency, high precision, and good batch production consistency. The disadvantage is that most of the equipment is imported products, and the general price is more than 1 million yuan.
There is also processed by ordinary equipment, which is divided into groove grinding machine processing spiral groove, end gear processing end tooth and end, and edge cleaning machine (peripheral gear machine) processing peripheral teeth. This kind of product needs to be separated according to various sections. The labor cost for processing is very high, and the quality of mass-produced products is controlled by the proficiency of the workers themselves in operating the machine, so the accuracy and consistency will be worse.
In addition, the quality of the cemented carbide milling cutter is related to the grade of the selected cemented carbide material. Generally, the appropriate alloy grade should be selected according to the material to be processed. Generally speaking, the smaller the alloy grain, the better the processing.
The main difference between high-speed steel milling cutters and cemented carbide milling cutters is: high-speed steel needs to undergo a heat treatment process to increase its hardness, while ordinary steel is soft as long as it has not undergone heat treatment.
At present, M42 high-speed steel and M7 high-speed steel are popular internationally in the United States. Among them, M42 high-speed steel has the best comprehensive performance, regardless of its grinding property, hardness and red hardness, but M42 high-speed steel contains 8 Cobalt is a scarce and non-renewable resource, so the price of M42 is very expensive, generally between 300 and 200,000. Of course, domestically produced M42 produced from individual recycled materials will be cheaper. In addition, the popular ones in China are W18, M2, W9, and general-purpose High-speed steel and M2AL, W9AL and other high-performance high-speed steels, including M2AL and W9AL. As the name suggests, these two grades of high-speed steel are made by adding aluminum to M2 and W9. The role of aluminum is equivalent to a bonding agent. , The particles in the steel are tightly bonded together, so that the quality of the steel will be good. In particular, M2AL is a high-speed steel specially developed by China to replace M42. The knives made of this high-speed steel were popular in foreign markets in the 1980s. , But with market competition and the excessive use of recycled materials for high-speed steel, the performance of this steel is still worse than that of M42, but for some processed materials that are not particularly demanding, M2AL is still a good one. Choice, after all, is much cheaper than M42.
Milling cutter coating
The coating generally has a thickness of about 3 μ on the surface of the milling cutter. The main purpose is to increase the surface hardness of the milling cutter. Some coatings can also reduce the affinity with the processed material.
In general, milling cutters cannot have both toughness and hardness, and the emergence of coating technology has solved this situation to a certain extent. For example, milling cutters are made of raw materials with higher toughness and coated with hardness on the surface. High coating, so the performance of the milling cutter is greatly improved.
