气膜冷却孔电火花加工参数优化及重熔层厚度测量实验

摘要

The surface roughness and the recast layer thickness of film cooling holes directly affect the service life of aircraft engines. Coordinating the processing speed of blade film cooling holes and the thickness of recast layers,the parameters for electro-discharge machining (EDM) was optimized. A pulse power supply system with narrow pulse width and high current peak was developed ,which its process parameters were adjustable on line. The major factors influencing the recast layer thickness and processing speed were investigated,and the multi-objective optimization was carried out by the gray relevancy analysis method. Using the optimized parameters ,the more good experimental results are obtained.%气膜冷却孔加工表面粗糙度、重熔层厚度直接影响航空发动机服役寿命。兼顾叶片气膜冷却孔加工效率和重熔层厚度，研制了加工参数在线可调的窄脉宽高峰值电流脉冲电源系统，进行了气膜冷却孔电火花加工参数优化实验，寻找重熔层厚度和加工效率的显著影响因素。在此基础上，采用灰关联度分析法进行多目标优化，利用优化后的加工参数，得到了较理想的实验结果。