航空发动机薄壁叶片精密数控加工技术研究

加工变形是影响薄壁零件数控加工效率、精度和表面质量的关键性制约因素。本文针对航空发动机薄壁叶片精密数控加工中的变形问题 ,在分析钛合金叶片结构和工艺特点基础上 ,提出了叶片的精确定位方案、以及支撑叶片并控制弹性变形和残余应力变形的有效方法。通过五坐标数控编程和加工试验对新方法进行了验证。测试结果表明 ,采用新方法加工出的叶片满足设计性能要求 ,不但质量上优于传统制造工艺 ,而且制造成本显著降低、周期缩短 6 0 %以上

Study on Net-Shape NC Machinging Technology of Thin-Balde of Aeroengine

Cutting deformation and/or distortion are the key factors that restrict and limit the cutting efficiency, precision and surface quality of thin-parts. To solve the easy-to-be-distorted problems in accurate or net-shape NC machining of thin-blades of aero-engine, the structural and technical features of titanium-alloy blades are analyzed. Then we present an exactly locating method for blades, and an effective way to support the blade in order to control the elastic deformation and/or residual stress distortion during and after cutting process. Five-axes NC programming and blade machining are performed. The test result proved that the experimental blades completely satisfy the design requirements. Compared with traditional machining technique, this new method can bring not only much higher blade machining precision, but better surface quality, and lower cost, and can reduce machining time more than 60%.