涡轮静子电火花电弧复合加工工艺研究

Technology Research on Electric Spark and Arc Machining of Turbine Stator

航天发动机的涡轮静子是一种集合了闭式整体叶盘难加工结构和高温合金难加工材料于一体的复杂零件。针对该涡轮静子加工效率较低、制造成本昂贵等难题,提出一种电火花电弧复合制造这类零件的方法。首先,采用高速电弧加工方法对高温合金进行工艺试验,分析不同工艺参数下的工件加工效率、表面粗糙度、再铸层和热影响层等方面的变化规律;然后,以高温合金涡轮静子为加工对象,开展电火花电弧复合工艺研究,以实现产品的高效精密加工。结果表明:与单一的电火花成形加工相比,采用电火花电弧复合工艺加工涡轮静子的加工效率提高了52%。

Turbine stator of aerospace engine was a complex part that contains hard-to-process integral impeller structure and difficult to treat superalloy material.Aiming at the problems of low machining efficiency and high manufacturing cost of turbine stator,a new method of manufacturing this kind of parts by electric spark and arc machining was proposed.Firstly,the high-speed arc machining research was carried out on superalloy,and the changes of machining efficiency,surface roughness,recast layer and heat-affected layer under different parameters were analyzed.Then,taking the superalloy turbine stator as the object,the research on compound machining was carried out to realize the efficient and precise processing of the product.The results show that,compared with traditional electro-discharge machining,the machining efficiency of turbine stator can be increased by 52%by using electric spark and arc machining.