气-液-固三相磨粒流光整加工及其工艺参数优化

发布时间：2018-06-07 00:37

  本文选题：流体抛光 + 气-液-固三相磨粒流抛光　； 参考：《光学精密工程》2016年04期

【摘要】：考虑用流体抛光法加工大尺度工件存在效率低下问题,本文提出了一种气-液-固三相磨粒流抛光方法。该方法在约束流场中引入微纳米气泡,利用气泡在溃灭时释放的能量加速驱动磨粒运动,从而有效提升抛光效率。实验显示:在加工过程中,离心泵的发热会导致流体黏度下降,进而影响工件近壁面的湍动能和动压力的大小及分布,而加工工件近壁面的湍动能和动压力会对表面纹理的均匀性和材料的去除效率有重要影响。针对上述实验结果,文中基于对磨粒流抛光机理的研究,提出一种通过改变入口流速来补偿温升带来的湍动能和动压力变化的方法,实验求得了抛光流体温度从20℃到60℃之间的9个均等点对应的最优入口流速值。实验表明,相对未加入气泡时,该抛光方法的加工效率得到提高,而调速补偿明显提升了工件表面加工质量。
[Abstract]:Considering the low efficiency of machining large-scale workpieces by fluid polishing, a gas-liquid-solid three-phase abrasive flow polishing method is proposed in this paper. In this method, micro and nano bubbles are introduced into the confined flow field, and the energy released by the bubbles is used to accelerate the movement of the abrasive particles, thus effectively improving the polishing efficiency. The experimental results show that the heat of centrifugal pump will lead to the decrease of fluid viscosity, which will affect the turbulent kinetic energy and the size and distribution of the dynamic pressure near the wall of the workpiece. The turbulent kinetic energy and dynamic pressure near the wall of the workpiece will have an important effect on the uniformity of the surface texture and the removal efficiency of the material. Based on the above experimental results, a method is proposed to compensate for the change of turbulent kinetic energy and dynamic pressure caused by temperature rise by changing the inlet velocity based on the study of the polishing mechanism of abrasive particle flow. The optimal inlet velocity values corresponding to 9 equal points of polishing fluid temperature from 20 鈩，

本文编号：1988867