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摘要: 为提高骨磨削手术的安全性,提出采用低温喷雾冷却对骨磨削过程进行热控制。搭建可三维运动的骨磨削实验平台,采用直径为4mm的医用金刚石球状磨头以60, 000rpm高转速在骨表面磨削加工。 磨具前、后进给方式下磨削力值相近,当切深为0.5mm时磨削平均功率约为5W。为降低磨削热引起的热损伤影响,将低温生理盐水喷雾(13℃,400mL/h)输送到磨削区,并考察喷雾射流方向和磨头进给方向对磨削温度的共同影响。研究结果表明,低温喷雾冷却能使骨磨削温升低于4℃,低于热损伤温升阈值6℃,但喷雾的射流方向对温度场有较大的影响。当喷嘴位于磨具上方时,有利于向后进给,位于磨具前方时,有利于向前进给,位于磨具侧面时,进给方向的影响较小。上述研究为优化骨磨削低温喷雾冷却系统奠定了一定的基础。
关键词 骨磨削;喷雾冷却;喷射方向;磨削温度;磨削力
中图分类号 TG58; TG74Abstract: In order to improve the safety of bone grinding operation, low temperature spray cooling was proposed to control the bone grinding process. A 3-dimensional bone grinding experimental platform was built, and a 4-mm medical diamond ball grinding head was used to grind the bone surface with a high rotational speed of 60, 000rpm. The magnitude of grinding force is similar for the forward and backward feeding directions. The average grinding power is about 5W when the depth of cut is 0.5mm. A low temperature saline spray (13℃, 400mL/h) was used to transport the spray to the grinding area through nozzles with different positions, and the effect of spray jet direction and feeding direction on grinding temperature was investigated. The results show that the low temperature spray cooling can make the temperature rise of bone grinding lower than 4℃, which is lower than the temperature rise threshold of thermal damage 6℃, however, the spray jet direction has a great influence on the temperature distribution. When the nozzle is located above the grinding tool, it is conducive to backward feed, when it is located in front of the grinding tool, it is conducive to forward feed, and when it is located on the side of the grinding tool, the influence of feeding direction is small. The above research has laid a certain foundation for optimizing the low temperature spray cooling system of bone grinding.-
Key words:
- bone grinding /
- spray cooling /
- injection direction /
- temperature /
- force
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