磁力研磨法光整内凹槽底面的工艺参数优化

Optimization of process parameters for finishing the bottom surface of inner groove by magnetic grinding

为提高磁力研磨法光整异形波导管内凹槽底面的研磨效率和研磨效果,解决其难光整问题,采用正交试验法研究钢珠直径、加工间隙、磁极盘转速3个主要工艺参数对表面粗糙度降低率ΔR_(a)的影响,并采用极差分析和方差分析法对工艺参数进行分析和优化。试验确定的最佳工艺参数组合是钢珠直径为1.0 mm,加工间隙为1 mm,磁极盘转速为800 r/min。采用最佳工艺参数对试样进行研磨抛光,加工30 min后试样表面的大量突起被去除,表面粗糙度值Ra从初始的11.059μm降至1.513μm,粗糙度降低率ΔR_(a)达到最大值86.3%,试样的表面质量得到有效改善。

To improve the efficiency and effect of magnetic grinding the bottom surface of inner groove and seek a solution of finishing inner groove of the special-shaped waveguide,the orthogonal test was used to investigate the effect of three major process parameters,namely steel grit size,process gap and magnetic pole rotating speed,on the surface roughness reduction rateΔR_(a).Meanwhile,the process parameters were analyzed and optimized by the range analysis method and the variance analysis method.The best process parameters were confirmed:steel ball diameter of 1.0 mm,process gap of 1 mm,and magnetic pole rotation speed of 800 r/min.It demonstrated that after 30 minutes of processing,many protrusions on the surface were removed and the surface morphology was improved.The roughness value R_(a)was reduced from the initial 11.059μm to 1.513μm with the maximum reduction of 86.3%,significantly improving the sur-face quality.