难加工材料闭式整体构件精密电火花加工技术研究

Research on Precision EDM Technology for Closed Integral Component of Difficult-to-Cut Material

闭式整体构件因其结构复杂、叶间流道空间弯扭程度大,使得加工可达性极差,且材料一般为难加工的高强度合金,整体制造难度很大。针对这一制造难题,研究了闭式整体构件电火花加工的若干关键技术,如叶间流道加工区域划分、成形电极及其加工运动轨迹设计、工艺基准统一和电参数选择与优化、数控电火花加工过程仿真分析等。在此基础上针对典型闭式整体构件进行了试制加工。试验结果表明,基于所研究的关键技术能够采用数控电火花加工技术精密、可靠地实现闭式整体构件的整体制造。

It is great difficult to manufacture a closed integral component due to its poor processing accessibilitycaused by complicated structure of air flow channel between two blades,especially the large bending and twisting degreein the channel as well as its component materials of high strength alloy.To solve this problem,several key technologies ofelectrical discharge machining(EDM)are discussed,such as division of the processing zone among the blades,shaped electrodeand its motion trajectory design,process benchmarking unification,process parameters selection and optimization,simulation of EDM process and so on.On top of this,typical closed integral components are studied and manufactured.It isshown from the experimental results the above-mentioned technologies enable numerical control EDM technology to realizeprecise and reliable manufacture of closed integral components.