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| Experimental Study on Axial Ultrasonic Vibration-Assisted Grinding of Particle-Reinforced Titanium Matrix Composites |
| WU Bangfu, DING Wenfeng, CAO Yang |
| (Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China) |
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Abstract Ultrasonic composite processing technology was introduced to solve the problems of high grinding temperature, poor surface quality, low processing efficiency and the short service life of abrasive wheel during the grinding process of particle-reinforced titanium matrix composites (PTMCs). Some comparative experiments of conventional grinding and axial ultrasonic vibration-assisted grinding of PTMCs were carried out. The influences of grinding process parameters on grinding force, surface roughness and microhardness were studied, and the influence mechanism of ultrasonic vibration was deeply analyzed. The results show that: ultrasonic vibration can significantly reduce the grinding force, the normal grinding force is reduced by 11.7%–20.1%, and the tangential grinding force is reduced by 9%–19%. With the increase of material removal rate, the surface quality of the machined surface gradually deteriorates, but the surface roughness of ultrasonic grinding is smaller than that of conventional grinding, which because the ultrasonic vibration changes the self-sharpening performance of abrasive wheel and the trajectory of abrasive grain. Furthermore, because ultrasonic vibration reduces the grinding force and grinding temperature, ultrasonic grinding not only inhibits grinding burns to a certain extent, reduces the microhardness of the machined surface, but also improves the defects of the machined surface.
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2021, 
