短电弧车削蜂窝环重铸层影响实验研究

Experimental study on effect of short arc turning on recast layer of honeycomb ring

蜂窝密封结构是当代航空发动机的先进高效密封结构,传统加工难以满足其加工质量要求,且一般电加工效率低,因此选择短电弧车削。针对材料为GH3536的蜂窝密封环进行实验,为研究不同参数对其加工后重铸层的影响,设置单因素试验,以重铸层厚度和微观形貌作为检测指标,分析电流及电压波形图、工件表面扫描电镜图、截面金相图和表面能谱图。结果证明:重铸层厚度随电压和进给速度增加而增加,随工件和电极转速增加而减小,且表面质量有相同的趋势,多槽挡板电极可以得到更好的冲液效果,重铸层更薄且表面质量更好。因此,适当降低电压和进给速度、提高工件和电极转速,以及采用多槽挡板电极,可减少微裂纹、冲蚀凹坑、褶皱和熔滴颗粒等现象,提高工件表面质量,降低重铸层厚度。

The honeycomb sealing structure is the advanced and efficient sealing structure of contemporary aviation engines.It is difficult to meet the processing quality requirements of traditional processing,and the general electricity processing efficiency is low.Therefore,the short arc car is selected.Experiments for honeycomb seals with GH3536.In order to study the impact of different parameters on the post-processing layer of the processing layer,set the single factor test,and use the thickness and micro-appearance of the recasting layer as the test index,analyze the current and voltage waveform diagram,the surface scanning electron microscopy,cross-sectional gold phase diagram,and the cross-section gold phase diagram,and Surface can spectrum.The results prove that the thickness of the reconstruction layer increased with the voltage and the rate of feed,and the speed of the workpiece and electrode decreased,and the surface quality has the same trend.The casting layer is smaller and the surface quality is better.Therefore,properly reduce voltage and feed speed,improve workpiece and electrode speed,and use wide groove baffle electrodes,which can reduce the phenomenon of micro-cracks,erosion pit,folds,and melting particles,layer thickness.