1. Tool Material Selection

Due to the high cutting force and temperature during precision parts machining, it is advisable to select hard alloy materials with high strength and good thermal conductivity for the cutting tools.

For the processing of quenching parts made from such materials, CBN (cubic boron nitride) blades can be used. CBN has a hardness second only to diamond, reaching up to 7000-8000 HV, thus offering high wear resistance. Compared to diamond, CBN's standout advantage is its superior thermal resistance, which can reach up to 1200°C, allowing for high cutting temperatures. Additionally, it exhibits significant chemical inertness and does not react chemically with ferrous metals at temperatures between 1200-1300°C, making it ideal for processing stainless steel materials. The tool life of CBN blades is several times longer than that of hard alloy or ceramic blades.

2. Cutting Tool Geometric Parameters

Tool geometry plays a crucial role in its cutting performance. To ensure smooth and easy cutting, hard alloy cutting tools should adopt a larger rake angle to enhance tool life. Generally, for rough machining, a rake angle of 10° to 20° is preferred; for semi-fine machining, 15° to 20°; and for fine machining, 20° to 30°. The selection of the main cutting edge angle is based on the rigidity of the process system: when the rigidity is good, an angle of 30° to 45° can be chosen; if the rigidity is poor, then an angle of 60° to 75° is recommended. When the ratio of the workpiece length to diameter exceeds 10 times, an angle of 90° can be used.

3. During the honing of the front blade edge, the roughness value should be small.

Precision Parts Manufacturer Advises: To prevent chip adhesion to the tool, both the front and rear cutting edges of the tool should be carefully honed to achieve a smaller roughness value, thereby reducing chip ejection resistance and avoiding chip adhesion.

4. The blade edges of the cutlery should be kept sharp.

The blade edge of cutting tools should be kept sharp to minimize work hardening. The feed rate and depth of cut should not be too small to prevent the tool from cutting into the hardened layer, which affects the tool's service life.