Noticias

Bimetals refers to a complete material system formed by two or more metal materials with different physical or chemical properties after complex spatial combination and arrangement. Since the emergence of metal composites, metal, polymer and other simple materials have been more widely used in the market. The development and application experience of various simple metal materials are integrated, and the sublimation of metal materials and related technologies is further realized. At present, metal composites are widely used in aerospace, transportation, medical and other fields, and have attracted the attention of the material industry. The composite application of metal materials can not only improve the hardness, strength and wear resistance of each metal material, but also reduce the plasticity of the material to a certain extent. However, for some metal materials with high plasticity, their strength and modulus usually decrease after compounding. Therefore, when choosing bimetals for machine, we should first clarify the actual needs of its application, and then improve the corresponding performance by selecting different metal materials.
 

 
The cutting tools used in traditional machining methods are usually steel and cemented carbide materials, but when applied to the machining of metal composites, it is difficult to meet the cutting requirements of metal composites. To solve this problem, when designing the machining method based on metal composite materials, we should first combine the actual characteristics of metal composite materials and choose new tool materials. The new superhard tool material is selected as the tool for bimetals for machine. The material is made of polycrystalline diamond and sintered under high temperature and high pressure. It has the characteristics of high strength and high toughness in the process of use, so it is suitable for metal composites with high hardness and strength. In order to improve the wear resistance of machining tools, it is also necessary to apply a layer of coating material on the tool surface before use, select materials with relatively fine particle size, and ensure that the thickness of the coating is 5.8 μ m~6.5 μ M range, so as to reduce the friction coefficient of the tool surface, can not improve its anti adhesion. For different machining stages, tool materials can also be reasonably selected. For example, in the finish milling stage, a new type of superhard tool with titanium nitride aluminide coating on its surface can be used; In the rough machining stage, due to the relatively large machining allowance, the use of new superhard tool materials is not suitable for this stage of processing, so the boron nitride milling cutter with relatively low cost can be used first.