数控电解, 整体叶轮, 过切, 运动轨迹, 数控编程

The overcut was caused by the twisted blades while integral impeller with ruled-surface blades were electrochemically finish machined using linear edged simple cathode. To solve this problem, a method-to adjust moving path of the cathode-was put forward. With this aim, firstly the fitting surface of ruled-surface blade with given data was discussed. Then the equation of movement displacement of four axis was deduced in order to design the numerical control (NC) machining program after the surface of blade was discretized. Moreover, through studying geometric characteristics of the blade surface, one cause of overcut was analysed - when blade with twisted ruled-surface was machined by the cathode with certain width. So moving path of the cathode was redesigned according to the amount of the overcut. Finally the integral impeller blades meeting the requirements were electrochemically machined.