When it comes to the processing technology of stainless steel parts, there are mainly two kinds of processing technology: drilling and boring. Today, Xiaobian will introduce these two processing technologies to you.
Drilling
During the drilling process of stainless steel parts, due to the poor thermal conductivity and small elastic modulus of stainless steel materials, the hole processing is also difficult. To solve the problem of hole machining of such materials, it is mainly to select appropriate tool materials.
Boring
(1) Tool material selection: due to the large cutting force and high cutting temperature when machining stainless steel parts, the tool material should be cemented carbide with high strength and good thermal conductivity. CBN (cubic boron nitride) blades can be used for machining hardened parts of such materials. The hardness of CBN is second only to diamond, and the hardness of stainless steel parts can reach 7000~8000HV. Therefore, CBN has high wear resistance. Compared with diamond, the outstanding advantage of CBN is that its heat resistance is much higher than that of diamond, up to 1200 ℃, and can withstand high cutting temperature. In addition, its chemical inertness is very large, and it has no chemical interaction with ferrous metals at 1200~1300 ℃, so it is very suitable for processing stainless steel materials. Its tool life is dozens of times that of cemented carbide or ceramic tools.
(2) Tool geometric parameters Tool geometric parameters play an important role in its cutting performance. In order to make the cutting light and smooth, the carbide tool should adopt a larger rake angle to improve the tool life. For general rough machining, the front angle is 10 ° – 20 °, and for semi-finishing, it is 15 ° – 20 °; Take 20 °~30 ° for finishing. The selection basis of the main deflection angle is that when the rigidity of the process system is good, it can be taken as 30 °~45 °; If the rigidity of the process system is poor, 60~75 ° is taken, and 90 ° is taken when the ratio of workpiece length to diameter exceeds 10 times.
(3) When grinding the front face, the roughness value should be small. In order to avoid chip sticking, the front and rear face of the tool should be carefully grinded to ensure a small roughness value, so as to reduce chip outflow resistance and avoid chip sticking.
(4) The cutting edge should be kept sharp. The cutting edge should be kept sharp to reduce work hardening. The feed rate and back feed should not be too small to prevent the cutting tool from cutting in the hardened layer and affecting the service life of the tool.
(5) Pay attention to the grinding of the chip breaking groove. Because the stainless steel chips are strong and tough, the chip breaking groove on the front face of the tool should be grinded properly, so that it is convenient to interrupt, contain and remove chips in the cutting process.
(6) According to the characteristics of stainless steel materials, the selection of cutting parameters for stainless steel parts processing technology should select low speed and large feed rate for cutting.
