1.Drilling processing

During the drilling process of stainless steel parts, due to the poor thermal conductivity and small elastic modulus of stainless steel materials, it is also relatively difficult to process holes. To solve the problem of hole processing for such materials, the main approach is to select appropriate tool materials

Boring processing

(1Tool material selection Due to the large cutting force and high cutting temperature when processing stainless steel parts, the tool material should be selected as hard alloy with high strength and good thermal conductivity as much as possible. For the processing of quenched parts made of such materials, the following can be adoptedCBN(Cubic boron nitride) bladeCBNIts hardness is second only to that of diamond. The hardness of stainless steel parts can be achieved through processing techniques7000～8000HVTherefore, it has a very high wear resistance. Compared with diamond,CBNThe prominent advantage is that its heat resistance is much higher than that of diamond, and it can reach1200℃It can withstand very high cutting temperatures. In addition, it has a very high chemical inertness and is incompatible with iron group metals1200～1300℃It does not have a chemical reaction at that time, so it is very suitable for processing stainless steel materials. The tool life of it is dozens of times that of hard alloy or ceramic tools.

(2Tool geometry parameters The geometric parameters of cutting tools play an important role in their cutting performance. To ensure smooth and brisk cutting, carbide tools should adopt a larger rake Angle to increase tool life. In general rough machining, the rake Angle is taken10°～20°Take during semi-finishing15°～20°; Take during fine processing20°～30°. The selection basis of the main deflection Angle is that it can be taken when the rigidity of the process system is good30°～45°; If the rigidity of the process system is poor, then take60～75°When the ratio of the workpiece's length to its diameter exceeds10When doubled, it is advisable90°.

(3The roughness value of the rake face should be small when grinding To prevent the phenomenon of chip sticking to the tool, the front and rear faces of the tool should be carefully ground to ensure a small roughness value, thereby reducing the resistance of chip outflow and avoiding chip sticking to the tool.

(4The cutting edge of the tool should be kept sharp The cutting edge of the tool should be kept sharp to reduce work hardening. The feed rate and depth of cut should not be too small to prevent the tool from cutting in the hardened layer and affecting the service life of the tool.

(5Pay attention to the grinding of the chip breaking groove Due to the strong and tough nature of stainless steel chips, the chip-breaking grooves on the rake face of the cutting tool should be properly ground to facilitate chip interruption, chip storage and chip removal during the cutting process.

(6The selection of cutting parameters for stainless steel parts processing technology According to the characteristics of stainless steel materials, it is advisable to use low speed and a larger feed rate for cutting during processing.