航发钛合金风扇叶片自适应砂带磨削实验研究

Research on adaptive belt grinding aeroengine titanium alloy fan blades

航空发动机叶片的材料多为钛合金,该类材料强度和机械性能良好,但加工性能差,而模锻、精铣后的叶片型面精度和表面质量需要加工来满足航空发动机的要求。通过三坐标测量仪最佳拟合法检测模锻叶片,确定叶片型面加工余量,再采用自适应砂带磨削方式对航发模锻叶片材料定量去除。结果表明:磨削加工能精准去除模锻叶片表面的加工余量,保证叶片进排气边的圆弧过渡,且叶片表面粗糙度Ra值均在0.4μm以下。

Most aeroengine blades are made of titanium alloys, which have good strength and mechanical properties, but poor machinability. The surface precision and surface quality of the blades after precision forging and precision milling need to be machined to meet the requirements of aeroengine.The machining allowance of precision forged blade is determined by the best fitting method with three coordinate measuring instrument, which is removed from the blade by adaptive abrasive belt grinding method. The results show that the grinding process can accurately remove the machining allowance of precision forged blade surface and guarantee the arc transition of blade inlet and exhaust edges. In addition, the roughness R a values of blade surface are all below 0.4 μm.