圆柱曲面剪切增稠抛光材料去除函数仿真与实验研究

目的 通过有限元仿真方法获得圆柱曲面周围压强场和速度场的分布，结合实验结果拟合得到修正系数，从而建立圆柱曲面剪切增稠抛光（STP）的材料去除函数。方法 运用计算流体动力学仿真软件CFX，对圆柱曲面STP过程的抛光液流动进行仿真，通过对比工件所受作用力的仿真值与实验测量值，求得流体流变特性修正系数Kv，再根据仿真得到的圆柱曲面表面压强场和抛光液速度场，基于Preston方程建立圆柱曲面STP的材料去除函数。以不锈钢316圆柱曲面为抛光实验对象，通过去除率测量结果拟合得到材料去除函数系数。结果 计算得出流体流变特性修正系数Kv=40.1，修正后，仿真模型的压力输出值与实验测量值的误差为4.7%。计算得到Preston方程去除函数的方程系数Kc=28.85。材料去除函数在整个圆柱曲面呈现近似正弦函数的分布规律，与抛光速度呈指数函数关系。抛光仿真和实验结果有着较好的吻合，误差在5%以内，表明了仿真模型的有效性。结论 通过CFX仿真，可以很好地揭示剪切增稠抛光过程中圆柱曲面表面压强场和速度场的分布规律，并基于Preston方程建立材料去除函数，这种剪切增稠抛光去除函数的建立方法，不仅仅适用于规则的圆柱体，也适合其他形状工件剪切增稠抛光去除函数的建立。

Simulation and Experimental Study on Material Removal Function of Shear Thickening Polishing Cylindrical Surface

The paper aims to obtain the distribution of pressure field and velocity field around cylindrical surface by finite element simulation method, to establish the material removal function of cylindrical shear thickening polishing in combination with the correction coefficient obtained by fitting the experimental results. The computational fluid dynamics simulation software CFX was used to simulate the flow of the polishing liquid in the shearing thickening process of cylindrical curved surface. By comparing the simulated value and experimental measurement value of the force applied to the workpiece, the fluid rheological property correction coefficient Kv was obtained. Based on the simulated surface pressure field and polishing fluid velocity field, the material removal function of shear thickening polishing cylindrical curved was established based on Preston equation. With stainless steel 316 curved cylinder as the target of polishing experiment, the material removal function was obtained based on the measurement result of removal rate. The result showed that the fluid rheological property correction coefficient Kv=40.1, the error of the pressure output value of the modified model and the experimental measurement after correction was 4.7%, the equation coefficient of the Preston equation removal function was calculated to be Kc=28.85, the material removal function presents a distribution law of approximate sinusoidal function throughout the cylindrical surface and was exponentially related to the polishing speed. The polishing simulation and experimental results were in good agreement, and the error was within 5%, indicating the effectiveness of the simulation model. The distribution law of pressure field and velocity field on the surface of cylindrical curved surface during shear thickening polishing can be well revealed by CFX simulation. The material removal function established based on Preston equation. And the establishment of this shear thickening polishing removal function is not only applicable to regular cylinders, but also suitable for the establishment of shear thickening polishing removal function for other shape workpieces.