• 2023-07-24
• 499
• 5 Comments

Reasons why stainless steel parts are difficult to produce and process

Why stainless steel parts production and processing is difficult, the key factors are as follows:

1, the cold hardening layer is serious: stainless steel parts to austenite and austenitic + ferritic stainless steel cold hardening status Z is highlighted, due to the large plasticity of stainless steel, plastic deformation of the element distortion, strengthening coefficient is very large, and austenite can not be stable, under the actual effect of drilling stress, some austenite will change into martensite; In addition, under the cutting heat effect, chemical impurities are very easy to decompose into a misdistribution, it is true that the hardened layer occurs after grinding, and the hardened layer existing in the previous walk or transfer to the step seriously affects the smooth development of the next step;

2, cutting tools are very easy to damage: In the process of stainless steel drilling, due to the affinity effect, it is true that there is adhesive diffusion between the cutting chips, and then the tool produces adhesive wear and diffusion damage, resulting in a crescent in the front edge of the tool, the cutting edge will continue to produce a little bit of falling off and notching, plus the hardness of the carbide particles in the stainless steel parts is quite high, and the drilling tool directly touches the conflict. There are also cold hardening conditions that will increase the tool life;

3, CNC machining cutting force: CNC lathe in the processing of stainless steel parts used in the cutting force is very large, stainless steel in the grinding process plasticity, at the same time, stainless steel cold hardening serious, greatly increased drilling resistance, drilling bending and breaking is also very difficult;

4, drilling is not easy to break but also easy to bond: Due to the material plasticity and resistance are very large, CNC machining drilling continuous, not only affect the smooth performance of control, and even chips will continue to squeeze the surface has been produced and processed, under the effect of high temperature and high pressure, stainless steel and other metals have a strong affinity, it is easy to occur adhesion and chip accumulation. Therefore, it further aggravates the wear and tear of the tool and shows the pulling condition, which is the deterioration of the production and processing surface, and the characteristics of martensitic stainless steel with lower carbon content are more prominent;

5, the coefficient of thermal expansion is large: the coefficient of thermal expansion of stainless steel is more than 1.5 times that of carbon steel, and the workpiece is deformed under the actual effect of cutting temperature, and the machining accuracy of the workpiece is difficult to control;

6, grinding processing temperature is very high: stainless steel parts drilling, plastic deformation and the conflict between the tool are very large, so the cutting heat is too much, coupled with the stainless steel heat transfer coefficient is very low, a lot of cutting heat will be concentrated in the drilling area and the tool chip touch the page, resulting in very bad heat dissipation standards;