Is cnc processing precision stainless steel parts really so difficult?n

Our common stainless steel precision parts are usually manufactured using conventional grades such as 303, 304, 316, and 420. Stainless steel parts have good formability, compatibility, corrosion resistance, and strong rigidity, whether in the Heavy industry or light industry can still be seen everywhere in our daily life. Usually, an alloy containing more than 12{40853765ee30ac98edfcc6f3daa6ce342bfa067bc7a6d6f9827ef46304b1ff49} chromium or more than 8{40853765ee30ac98edfcc6f3daa6ce342bfa067bc7a6d6f9827ef46304b1ff49} nickel is called stainless steel. This material has good corrosion resistance in the atmosphere or in a corrosive environment. At very high temperatures (usually >450 ° C), it has a very strong rigidity. Steels with a chromium content of 16{40853765ee30ac98edfcc6f3daa6ce342bfa067bc7a6d6f9827ef46304b1ff49} to 18{40853765ee30ac98edfcc6f3daa6ce342bfa067bc7a6d6f9827ef46304b1ff49} are called acid-resistant steel or acid-resistant stainless steel. However, we do not specialize in steel refining. Therefore, it is basically called stainless steel, but as a precision stainless steel parts processing manufacturer, we must understand the grades, corresponding characteristics, and fields of use of stainless steel, for example, in aerospace, petrochemical, construction. Traffic, kitchen utensils, etc., have different requirements for materials. Many processing manufacturers will be confused when facing stainless steel precision machining. Different grades of stainless steel have different hardness and different characteristics. In the field of cnc processing, is stainless steel machining difficult? VIM Precision Technology has 18 years of experience in precision stainless steel parts processing. We have made an inventory of stainless steel processing difficulties for everyone to see what is there? A. Large cutting force: The stainless steel has large plastic deformation during the cutting process, resulting in an increase in cutting force. Stainless steel has severe work hardening and high heat strength, which further increases the cutting resistance, and the curling and breaking of the chips is also difficult. B. The work hardening is serious: the plasticity of stainless steel is large, the character is twisted and twisted during plastic deformation, and the strengthening coefficient is large; and the austenite is not stable enough, part of the austenite will be transformed into martensite under the action of cutting stress; The upper compound impurity is easily decomposed into a dispersion distribution under the action of cutting heat, so that a hardened layer is produced during the cutting process. The work hardening phenomenon caused by the previous feed or the previous process seriously affects the smooth progress of the subsequent process. C, the chip is not easy to break, easy to bond: stainless steel plasticity, toughness is very large, CNC continuous cutting, not only affect the smooth operation, the chip will also crush the processed surface. Under high temperature and high pressure, stainless steel has strong affinity with other metals, which is easy to cause adhesion and form built-up edge, which not only aggravates tool wear, but also tears and deteriorates the processed surface. D, high cutting temperature: plastic deformation during cutting and friction with the tool are very large, resulting in a lot of cutting heat; a large amount of cutting heat is concentrated in the cutting area and the blade-chip contact interface, the heat dissipation conditions are poor. E. Large linear expansion coefficient: The linear expansion coefficient of stainless steel is about 1.5 times that of carbon steel. Under the action of cutting temperature, the workpiece is prone to thermal deformation, and the dimensional accuracy is difficult to control. F, the tool is easy to wear: the affinity function in the process of cutting stainless steel, so that the knife-chip will bond and spread, so that the tool will produce bond wear, diffusion wear, resulting in crescent knives on the rake face of the tool, and the cutting edge will Forming tiny spalling and gaps; plus the high hardness of carbides in stainless steel (such as TiC), direct contact with the tool during cutting, friction, scratching the tool, and work hardening, will increase tool wear. Through the above analysis, we know that the difficulty in cutting machining of stainless steel precision parts basically shows the difficulty of cutting, work hardening, large viscosity, high temperature, large coefficient of linear expansion and easy wear of the tool. When we understand the stainless steel processing When such characteristics are present, the corresponding selection of the machine tool, the selection of the tool, the selection of the cutting line, the amount of cutting, the cutting fluid and the like are taken to ensure the quality of the product processing. Since its establishment in 2001, Shenzhen VIM Precision Technology has been exposed to stainless steel parts mainly including 303, 304, 316, etc., 304 is more common in our daily life, belonging to the catering grade material, 316 is mainly medical grade material, due to The hardness of this kind of material is high, many cnc processing manufacturers are shunned, but our company’s technical team constantly optimizes its processing technology. At present, the company’s products are widely used in medical, communications, optoelectronics, kitchen, aviation, automotive and other fields.