磁性复合流体仿贝壳抛光轨迹优化及误差分析

Optimization and Error Analysis of Magnetic Composite Fluid Polishing Trajectory on Shell Surface

针对船舶领域对仿贝壳元件的高精度需求,设计一种螺旋线式抛光轨迹对仿贝壳表面进行磁性复合流体(MCF)抛光。根据抛光轨迹和仿贝壳表面方程计算出所有走刀路径下抛光点的加工坐标,提出一种抛光路径优化算法,解决了螺旋线式抛光轨迹在进行MCF抛光时工件底部区域较顶部区域抛光接触点较少造成抛光不均匀的问题,并建立弓高误差模型,对抛光路径优化前后的弓高误差变化规律进行仿真。仿真结果表明,轨迹优化后相比优化前的弓高误差最大值从2.667μm降低到1.841μm,弓高误差的RMS值从1.896μm降低到0.885μm,PV值从2.301μm降低到1.562μm。因此,使用抛光轨迹优化算法后的仿贝壳表面加工精度更高。

In order to fulfill the high precision requirements of shell imitation components in the marine field,magnetic composite fluid was designed to polish the shell surface based on Archimedes spiral polishing track.The machining coordinates of the polishing points under all the cutting paths were calculated according to the polishing track and the shell surface equation.In this paper,an optimal polishing path algorithm is proposed,which solves the problem that the contact points of the bottom area of the workpiece are less than those of the top area when the Archimedes spiral type is used for MCF polishing.A bow height error model was established to simulate the variation rule of bow height error before and after optimizing the polishing path.The simulation results show that the maximum bow height error after trajectory optimization is reduced from 2.667μm to 1.841μm,the RMS value of bow height error is reduced from 1.896μm to 0.885μm,and the PV value of bow height error is reduced from 2.301μm to 1.562μm.Therefore,the machining precision of the imitation shell surface is higher with the polishing trajectory optimization algorithm.