CBN cutting tools exhibit normal and abnormal wear during use. The normal wear patterns of CBN cutting tools primarily include oxidation wear, phase transformation wear, friction wear, adhesion wear, micro-chipping wear, and spalling wear, with various wear factors influencing and promoting each other. The main factors contributing to abnormal wear of CBN cutting tools are incorrect selection of cutting parameters and tool geometry, as well as insufficient rigidity of the machining system. To enhance the service life of CBN cutting tools, specific measures can be taken to improve the common wear and damage phenomena encountered during actual use.

1. Post-cutting edge wear

Improvement Measures: 1. Increase cutting line speed; 2. Enhance workpiece feed rate; 3. Increase cutting depth; 4. Verify if the blade cutting point is positioned at the center height; 5. For cast iron materials being processed, check if the ferrite content is within the controlled range.

2. Moontide Abrasion

Improvement Measures: 1. Reduce cutting speed; 2. Decrease workpiece feed rate.

3. Cutting and hammering

Improvement Measures: 1. Increase cutting speed; 2. Decrease cutting feed rate; 3. Improve the cutting edge angle of the tool (e.g., by using round blade inserts).

4. Blade Edge Chipping

Improvement Measures: 1. Use blades with chamfered edges or those that have been ground; 2. Reduce cutting speed or minimize intermittent cutting as much as possible; 3. Enhance the rigidity of the process system; 4. If intermittent cutting is unavoidable (e.g., when machining surfaces with holes or slots), pre-chamfer the corresponding cutting entry points; 5. Adjust the cutting line speed to optimize cutting conditions and prevent vibrations.

5. Blade face delamination during milling

Improvement Measures: ①Reduce the cutting tool's切入 angle (less than 20°); ②Opt for逆铣method whenever possible; ③Avoid the use of coolant; ④Increase the cutting speed.

6. Critical Blade Chipping

Improvement Measures: ①Reduce cutting depth or stock removal to lower cutting load; ②Decrease cutting speed; ③Increase the tip radius (even consider round blades); ④Use blades with beveled or ground cutting edges; ⑤Inspect blade installation for correctness and reliability, and the integrity of the installation surface (especially for solid CBN blades); ⑥Check the blade's cutting edge center height for accuracy.

The success of PCBN tool usage depends not only on the quality of the tool itself but also on various aspects of the entire machining system, including the performance of machine tools, the reliability of workpiece clamping, the rigidity of the tool holder system, the rationality of blade selection, and the choice of cutting parameters, all of which affect the machining effect of PCBN tools. Only by using PCBN tools correctly and rationally can one improve processing efficiency, reduce production costs, and achieve greater technical and economic benefits.