Ultrasonic Micro-grinding Biological Bone Non-uniform Heat Source Temperature Field Model and Experimental Verification

doi:10.3901/JME.2025.09.178

Abstract

Abstract: Bone micro-grinding is an indispensable method in high risk surgery such as neurosurgery and spinal surgery, and thermal damage is the technical bottleneck of bone grinding removal. In view of the above clinical requirements and technical bottlenecks, a new ultrasonic vibration-assisted micro-grinding biological bone process is proposed. However, the non-uniform heat source distribution model under ultrasonic action is still unclear, and the biological bone heat transfer mechanism and temperature field model under ultrasonic enabling need to be established. Firstly, the removal mechanism of biological bone material by ultrasonic vibration assisted micro-grinding is studied, the surface geometry of spherical grinding head is reconstructed, the contact arc length variation mechanism is revealed, and the thickness model of undeformed chips at any time point under ultrasonic vibration is established. Secondly, the grinding force model of ductile domain removal, bone meal removal and brittle domain removal is established to reveal the mechanical evolution of the effective grinding zone. Further, the circumferential and radial distribution of grinding heat flux is studied, and a three-dimensional non-uniform heat source distribution model is established. The temperature field of point heat source, line heat source and surface heat source is studied, and the three-dimensional non-uniform heat source temperature field model of micro-grinding biological bone assisted by ultrasonic vibration is established. Finally, orthogonal experiments are carried out to verify the grinding temperature field. The results show that when the amplitude is 6 μm, the grinding depth is 15 μm, the radius of the grinding head is 3.5 mm, and the feed speed is 3 mm/s, compared with the temperature field based on the uniform heat source model, the predicted temperature field based on the non-uniform heat source model is consistent with the actual temperature field. The average error in the maximum temperature forecast was reduced from 10.8% to 6.7%. The research provides theoretical basis and technical support for ultrasonic vibration assisted micro-grinding biological bone to reduce grinding temperature.

Key words: ultrasonic vibration, micro-grinding, non-uniform heat source distribution model, temperature field

CLC Number:

TG580

SUN Jingang, YANG Min, YANG Yuying, ZHANG Yanbin, Y S DAMBATTA, ZHOU Zongming, LI Changhe. Ultrasonic Micro-grinding Biological Bone Non-uniform Heat Source Temperature Field Model and Experimental Verification[J]. Journal of Mechanical Engineering, 2025, 61(9): 178-198.

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