采用电解-机械复合抛光工艺处理某压缩机45钢曲轴，以改善其表面粗糙度。通过单因素试验和正交试验对电解-机械复合抛光工艺进行优化，得到的最佳工艺条件如下：对于脉冲电解抛光，输出频率1000 Hz，方波占空比50%，电解液NaNO3的质量分数20%，电流密度50 A/cm2，工作电压10 V；对于机械抛光，砂轮转速160 r/min，磨削压力2 kg/cm2，砂带粒度号1500#。在最佳电解-机械复合抛光工艺下，45钢的粗糙度 Ra均低于0.3μm，比抛光前降低了70%以上，满足粗糙度应低于0.5μm的加工要求。
The crankshaft of a compressor was treated by combined electrochemical and mechanical polishing for improving its roughness. The optimized process conditions by single factor experiment and orthogonal test are as follows:for pulse electropolishing, output frequency 1 000 Hz, duty cycle of square wave 50%, mass fraction of HNO3 in electrolyte 20%, current density 50 A/cm2, and working voltage 10 V;and for mechanical polishing, rotation rate of abrasive wheel 160 r/min, grinding force 2 kg/cm2, and granularity of abrasive belt 1500#. Under the optimal process conditions, the roughness (Ra) of polished 45 steel is not higher than 0.3μm, which is 70%lower than that of the unpolished one, meeting the roughness requirement of less than 0.5μm.
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