Ultrasonic Assisted Mechanical-chemical Truing Mechanism of Coarse Diamond Grinding Wheel and Applications of Mirror Grinding

doi:10.3901/JME.2025.17.381

Abstract

Abstract: The coarse diamond grinding wheel can realize the high-efficiency grinding processing of hard and brittle materials, but its grinding quality is poor, and the truing efficiency is extremely low. The ultrasonic assisted mechanical-chemical truing method is proposed to carry out high efficiency and precision truing for coarse diamond grinding wheel to obtain the truncated protrusive micro grain cutting edges, performing the high efficiency and precision mirror grinding processing of hard and brittle materials of silicon carbide ceramics. Ultrasonic assisted mechanical-chemical truing utilizes the ultrasonic high-frequency friction vibration between diamond and cast iron truing tools and atomic affinity chemical catalytic effect to rapidly remove graphited diamond to realize the efficient precision truing of coarse diamond grinding wheel. Firstly, the influences of ultrasonic truing process parameters including ultrasonic power, truing pressure and truing time on the protrusion homogeneity of #80 coarse diamond grains are investigated; then, the effects of the ultrasonic assisted mechanic-chemical truing parameters and grinding process parameters on the ground surface quality of silicon carbide ceramic are comparatively analyzed. The experimental results show that the ultrasonic assisted mechanic-chemical truing can effectively improve the grain protrusion homogeneity of grinding wheel, and when the ultrasound power, truing pressure, and truing time are 80%, 80 N, and 120 s, respectively, the percentage of the grains with protrusion height ranged from 96～135 μm increases from 69.8% (before truing) to 92.1%. Compared with the traditional mechanical truing, the diamond grinding wheel after ultrasonic assisted truing has better grinding performance and can reduce the surface roughness of silicon carbide by about 84.6%. When the rotational speed N=18 000 r/min, feed speed v_f=10 mm/min, grinding depth a_p=1 μm, the macroscopic ground surface of silicon carbide presents a mirror effect, and its surface roughness R_a can reach 46 nm.

Key words: coarse diamond grinding wheel, ultrasonic, truing, homogeneity, mirror grinding, silicon carbide

CLC Number:

TG74

LU Yanjun, DU Jiaxuan, WANG Qiang, GUAN Weifeng, WU Yongbo. Ultrasonic Assisted Mechanical-chemical Truing Mechanism of Coarse Diamond Grinding Wheel and Applications of Mirror Grinding[J]. Journal of Mechanical Engineering, 2025, 61(17): 381-392.

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