(1) Tool material selection
Due to the large cutting force and high cutting temperature during the processing of stainless steel parts, the tool material should be selected as hard alloy with high strength and good thermal conductivity as possible.
For the processing of quenched parts of this type of material, CBN (cubic boron nitride) blades can be used. The hardness of CBN is second only to diamond, and the hardness can reach 7000~8000HV, so the wear resistance is very high. Compared with diamond, CBN has outstanding advantages. The heat resistance is much higher than that of diamond, up to 1200℃, and it can withstand very high cutting temperatures. In addition, its chemical inertness is very large, and it does not play a chemical role with iron group metals at 1200~1300℃, so it is very suitable for processing stainless steel materials. The tool life is dozens of times that of cemented carbide or ceramic tools.
(2) Tool geometry parameters
Tool geometry parameters play an important role in its cutting performance. In order to make cutting brisk and smooth, a larger rake angle should be used for cemented carbide tools to increase tool life. Generally, the rake angle is 10°~20° in rough machining, 15°~20° in semi-finishing machining, and 20°~30° in finishing machining. The basis for the selection of the entering angle is that when the rigidity of the process system is good, it can be 30°~45°; if the rigidity of the process system is poor, it is 60~75°, and when the ratio of the length to the diameter of the workpiece exceeds 10 times, it can be 90°. °.
(3) The roughness value of the rake face should be small when sharpening
Stainless steel parts processing manufacturers tell you that in order to avoid the phenomenon of chip sticking, the front and flank surfaces of the tool should be sharpened carefully to ensure a small roughness value, thereby reducing the resistance to chip flow and avoiding chip sticking.
(4) The cutting edge of the tool should be kept sharp
The cutting edge of the tool should be kept sharp to reduce work hardening, and the feed rate and the amount of back-grabbing should not be too small to prevent the tool from cutting in the hardened layer, which affects the service life of the tool.
(5) Pay attention to the grinding of the chip breaker
Due to the toughness of stainless steel chips, the grinding of the chip breaker on the rake face of the tool should be appropriate, so that the cutting process can be interrupted, chip holding and chip removal is convenient.
(6) Selection of cutting parameters
According to the characteristics of stainless steel materials, low speed and larger feed rate should be selected for cutting.
(7) Choosing cutting fluid should be appropriate
Stainless steel parts processing manufacturers tell you that because stainless steel has the characteristics of easy adhesion and poor heat dissipation, it is very important to use cutting fluids with good adhesion resistance and heat dissipation in boring. For example, the selection of cutting fluids with higher chlorine content, And a water solution without mineral oil and sulphite with good cooling, cleaning, rust prevention and lubrication, such as H1L-2 synthetic cutting fluid.