Today, we will introduce to you the requirements when processing carbide inserts for stainless steel.
1. Requirements for Tool Geometric Parameters
The geometry of the cutting part should generally be considered from the choice of rake angle and back angle. When selecting the rake angle, the factors such as chip groove type, chamfering and the positive and negative angle of edge inclination angle should be considered. No matter what kind of tool, the larger front angle must be used when processing stainless steel. Increasing the rake angle of the tool can reduce the resistance in the process of chip removal and clearance. The selection of the back angle is not very strict, but it should not be too small. If the back angle is too small, it will easily cause serious friction with the surface of the workpiece, which will worsen the surface roughness and accelerate the tool wear. And due to strong friction, the effect of work hardening on the surface of stainless steel is enhanced. The clearance angle of the tool should not be too large. If the clearance angle is too large, the wedge angle of the tool is reduced, which not only reduces the strength of the cutting edge, but also accelerates the wear of the carbide milling cutter and the drill bit. Generally, the relief angle should be appropriately larger than when processing ordinary carbon steel.
2. Requirements for the Surface Roughness of the Cutting Part
Improving the surface finish of the cutting part of the tool can reduce the resistance when the chips are crimped and improve the durability of the carbide inserts for stainless steel. Compared with processing ordinary carbon steel, when processing stainless steel, the cutting amount should be appropriately reduced to slow down tool wear. At the same time, appropriate cooling and lubricating fluid should be selected to reduce the cutting heat and cutting force during the cutting process as well as prolong the service life of the tool.
3. Requirements for Cutting Some Materials
When machining cemented carbide inserts, it is required that the material of the cutting part of the tool has high wear resistance and can maintain its cutting performance at a higher temperature. At present, the commonly used tool materials are: high speed steel and cemented carbide. As high-speed steel can only maintain its cutting performance below 600 °C, it is not suitable for high-speed cutting, but only suitable for processing stainless steel at low speed. Since cemented carbide has better heat resistance and wear resistance than high-speed steel, CNC blades made of cemented carbide materials are more suitable for stainless steel cutting.