增材成型316L磁流变抛光工艺研究

Study on Magnetorheological Polishing Process of Additive Molding 316L

磁流变抛光工艺参数的确定对样件表面粗糙度有着直接的影响。通过单因素试验方法研究了在不同磁流变抛光工艺参数(主轴转速、水平工作进给速度、加工间隙)下对增材成型316L不锈钢样件表面粗糙度的影响。结果表明:随着主轴转速的增加,316L不锈钢样件表面粗糙度先降低后增加;水平工作进给会在一定程度上降低永磁体磁场分布不均导致磁流变抛光垫样貌带来的影响,增加抛光轨迹均匀性,降低表面粗糙度;而加工间隙直接影响了磁流变抛光垫夹持磨粒对样件的抛光压力,从而影响抛光质量。实验最后得到最优工艺参数组合为主轴转速600r/min、水平工作进给速度0.8mm/min、加工间隙0.6mm,此时抛光后表面粗糙度值Ra为0.023μm,为所有实验中的最优值。可见,合适的工艺参数能进一步提升磁流变抛光后的表面质量。

The determination of magnetorheological polishing process parameters has a direct influence on the surface roughness of the sample.The effects of different magnetorheological polishing process parameters(spindle speed,horizontal feed speed,pol-ishing gap)on the surface roughness of 316L stainless steel samples were studied by single factor test method.The results show that with the increase of spindle speed,the surface roughness of 316L stainless steel sample decreases at first and then increases;the horizontal feed will reduce the influence of magnetic field distribution of permanent magnet on the appearance of magnetorheologi-cal polishing pad to a certain extent,increase the uniformity of polishing trajectory and reduce the surface roughness;while the polishing gap directly affects the polishing pressure of the sample clamped by abrasive particles in the magnetorheological polish-ing pad,thus affecting the polishing quality.At the end of the experiment,the optimal process parameters are obtained as follows:spindle speed 600r/min,horizontal feed speed 0.8mm/min and polishing gap 0.6mm.At this time,the surface roughness value Ra after polishing is 0.023µm,which is the optimal value in all experiments.It can be seen that the appropriate process parameters can further improve the surface quality after magnetorheological polishing.