Biological bone micro-grinding: anisotropy-based performance evaluation and optimization

Abstract

Bone tissue is more accurately removed by micro-grinding, which is more conducive to postoperative recovery and healing. However, the anisotropy of the bone material is not taken into account in current research on bone tissue micro-grinding, and experiments to optimize the parameters of the bone grinding process are lacking, leaving a gap in reference for the selection of parameters in clinical surgery. Based on this, the bone micro-grinding force is first analyzed by considering the anisotropy of bone tissue, and a single-factor experiment investigates the effects of machining parameters on the micro-grinding process under the three directions of vertical, cross, and parallel to the feed direction of the grinding head and the bone unit. Orthogonal experiments are then used for optimization to evaluate the effect of each machining parameter on the machining quality based on the magnitude of micro-grinding force in the x- and y-directions and the surface morphology of the machined bone tissue. The results show that the minimum F_x and F_y and the best surface quality are obtained at a feed rate of 100 mm/min, a grinding head rotational speed of 16000 r/min, and a grinding depth of 15 μm. Finally, the results of the orthogonal experiments are analyzed by signal-to-noise ratio and analysis of variance, and the results show that the grinding depth factor has the greatest effect on F_x and F_y in the vertical direction, the grinding head rotational speed factor has the greatest effect on F_x and F_y in the cross direction, the grinding depth in the parallel direction has the greatest effect on F_x, and the grinding head rotational speed has the greatest effect on F_y. The aim of this study is to provide theoretical guidance and technical support to improve the processing quality of biological bone micro-grinding.

Graphical abstract

Keywords

biological bone / micro-grinding / anisotropic / grinding force / surface integrity

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