How does the CBN wheel self-sharpening effect maintain sharpness to improve the precision and efficiency of gear grinding?

The maintenance of self-sharpening effect of CBN grinding wheel is very important to improve the precision and efficiency of gear grinding. Self-sharpening effect means that in the grinding process, the abrasive particles on the surface of the grinding wheel produce a new cutting edge through wear, crushing, etc., so as to maintain the sharp state of the grinding wheel. This process helps to maintain the working performance of the grinding wheel, reduce the grinding force, improve the roughness quality of the machined surface, and thus improve the grinding efficiency and accuracy.

In order to maintain the self-sharpening effect of CBN grinding wheel, the following measures can be taken:

Select the right abrasive material: polycrystalline cubic boron nitride (PCBN) abrasive due to its excellent material properties and microstructure characteristics, help to achieve micro-crushing of abrasive particles, avoid bulk crushing phenomenon, is conducive to achieve high sharpness and long life of grinding wheel. In addition, resin CBN grinding wheel because of its good self-sharpness, not easy to plug and other characteristics, is also very suitable for precision grinding.

Optimize the hardness of the grinding wheel: By increasing the hardness of the grinding wheel, the grinding particle can be slowed down and the service life of a single abrasive particle can be increased, thus improving the wear resistance and toughness of the grinding wheel, reducing the crushing and extending the life of the grinding wheel.

The mixed fluid formed by the coolant and the grinding chips: The mixed fluid formed by the grinding chips and the coolant will impact, scour and scratch the grinding wheel bond, which helps to remove the grinding wheel bond and comb the abrasive particles, generate a new abrasive cutting edge, and maintain the sharpness of the grinding wheel.

Using fractal theory to explore the micro-crushing behavior of abrasive particles: Research based on fractal theory can help to deeply understand the micro-crushing behavior of PCBN abrasive particles during high-speed grinding, reveal the self-sharpening mechanism of grinding wheel, and provide theoretical support for formulating corresponding process strategy6.

Grinding wheel dressing: By using diamond grinding wheel shaping or abrasive elastic extrusion method to sharpen CBN grinding wheel, ideal grinding wheel accuracy and abrasive exit edge height can be obtained, so that the grinding wheel can maintain a stable grinding effect for a long time.

Control of grinding speed: Research shows that the "speed effect" is significant when grinding metal materials, with the increase of grinding speed, the grinding surface quality of the workpiece gradually improves, and the surface roughness decreases.

Through the above measures, the self-sharpening effect of CBN grinding wheel can be effectively maintained, and the precision and efficiency of gear grinding can be improved.

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