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drilling force and Temperature of Bone under Dry and Physiological drilling Conditions

Chinese Journal of Mechanical Engineering 2014年第6期27卷 1240-1248页

作者： XU Linlin WANG Chengyong JIANG Min HE Huiyu SONG Yuexian CHEN Hanyuan SHEN Jingnan ZHANG Jiayong School of Electromechanical Engineering Guangdong University of Technology Guangzhou Aquila Precise Tools LTD The First Affiliated Hospital Sun Yat-sen University National Engineering Research Center for Healthcare Devices

Many researches on drilling force and temperature have been done with the aim to reduce the labour intensiveness of surgery, avoid unnecessary damage and improve drilling quality. However, there has not been a systematic study of mid- and high-speed drilling under dry and physiological conditions（injection of saline）. Furthermore, there is no consensus on optimal drilling parameters. To study these parameters under dry and physiological drilling conditions, pig humerus bones are drilled with medical twist drills operated using a wide range of drilling speeds and feed rates. drilling force and temperature are measured using a YDZ-II01W dynamometer and a NEC TVS-500EX thermal infrared imager, respectively, to evaluate internal bone damage. To evaluate drilling quality, bone debris and hole morphology are observed by SEM（scanning electron microscopy）. Changes in drilling force and temperature give similar results during drilling such that the value of each parameter peaks just before the drill penetrates through the osteon of the compact bone into the trabeculae of the spongy bone. drilling temperatures under physiological conditions are much lower than those observed under dry conditions, while a larger drilling force occurs under physiological conditions than dry conditions. drilling speed and feed rate have a significant influence on drilling force, temperature, bone debris and hole morphology. The investigation of the effect of drilling force and temperature on internal bone damage reveals that a drilling speed of 4500 r/min and a feed rate of 50 mm/min are recommended for bone drilling under physiological conditions. drilling quality peaks under these optimal parameter conditions. This paper proposes the optimal drilling parameters under mid- and high-speed surgical drilling, considering internal bone damage and drilling quality, which can be looked as a reference for surgeons performing orthopedic operations.

关键词： drilling bone medical twist drill drilling force drilling temperature internal bone damage

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Variation characteristic of drilling force and influence of cutting parameter of SiCp/Al composite thin-walled workpiece

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Advances in Manufacturing 2019年第3期7卷 288-302页

作者： Shu-Tao Huang Chao Li Li-Fu Xu Lin Guo Xiao-Lin Yu School of Automobile and Traffic Shenyang Ligong UniversityShenyang 110159People's Republic of China School of Mechanical Engineering Dalian University of TechnologyDalian 116024LiaoningPeople's Republic of China School of Mechanical Engineering Shenyang Ligong UniversityShenyang 110159People's Republic of China

In this paper,the variation characteristic of the drilling force,and the influences of cutting speed,feed rate,and workpiece thickness on the drilling force,were eval・uated when drilling a silicon carbide particle reinforced aluminum matrix(SiCp/Al)composite thin-walled workpiece with a high volume fraction.Under the condition that the workpiece thickness was less than the drill tip height,three characteristic stages of drilling force variation were proposed.The results indicate that there is a sign币cant difference between the variations in the drilling force when drilling a thin-walled workpiece compared to thick-walled workpiece.When the chisel edge drills out the lower surface of the workpiece,there is an abrupt decrease in the thrust forces of the thin-walled and thick-walled workpieces.In addition,there is an abrupt decrease in the torque of the thick-walled workpiece,whereas that of the thinwalled workpiece increases.According to the thickness of the thin-walled workpiece,the instant of the abrupt decrease in the thrust force may lead or lag behind the theoretical instant at which the chisel edge reaches the lower surface of the workpiece without deformation.When drilling a thin-walled hole,the cutting speed has a slight influence on the thrust force,and there is a slight increase in the torque in accordance with an increase in the cutting speed.The thrust force and torque increase in accordance with an increase in the feed rate.When drilling a thinwalled workpiece with a thickness of 1 mm,the critical thickness of workpiece cracking decreases in accordance with an increase in the cutting speed,and increases in accordance with an increase in the feed rate.When drilling a thin-walled workpiece with a thickness of 0.5 mm,the concave deformation of the workpiece and the critical thickness of the workpiece cracking increase in accordance with an increase in the feed rate.However,the increment in the critical thickness of the workpiece cracking is less than that in the concave deformation of the workpiece.

关键词： SiCp/Al composites Thin-walled workpiece drilling drilling force

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The Simulation on drilling of Carbon Fiber Reinforced Plastic Composites

The Simulation on Drilling of Carbon Fiber Reinforced Plasti...

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2012年计算机应用与系统建模国际会议

作者： Fei Gao Xitian Tian Shunuan Liu Bo Li Institute of CAPP & Manufacturing Engineering Software Northwestern Polytechnical University

In order to study high speed drilling mechanism of carbon fiber reinforced plastics, a simulation on drilling is conducted by using FEM analysis software Deform-3D. The dynamic simulation of the drilling process of carbon fiber reinforced plastics is carry on basing on the elastic-plastic theory of material deformation and the thermal coupling theory, obtaining the data of drilling force and torque. The finite element model of carbon fiber reinforced plastics is established in this paper, the relevant techniques and setting principles for important parameters in the simulation are also given. The variation characteristics of drilling force and torque in the drilling process are deeply studied. The result of the research provides the support for further study of high speed drilling mechanism of carbon fiber reinforced plastics.

关键词： Deform simulation CFRP drilling force torque

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