关键词: 机床, 强力刮齿加工, 几何位姿误差, 逆向运动学, 误差修正

Abstract: To reduce the influence of machine tool's geometric location errors on gear accuracy in the process of power skiving,the sensitivity of profile normal error to each geometric location error was analyzed and an error correction method was proposed.Based on the homogeneous coordinate transformation,the error kinematic chain of machine tool was reconstructed according to machine tool structure.The tooth surface equation with errors and the mapping relationship between geometric location error and profile normal error were established based on the skiving theory.The sensitive error terms could be obtained by analyzing the sensitivity of profile normal error to location errors.An actual inverse kinematics method was proposed to solve the skiving forming function,and then the analytical expression of the corrected numerical control machining code was derived.By taking cylinder internal gear skiving as an example,the profile normal precision before and after correction were simulated and analyzed for a comparison.The simulation showed that the proposed method could correct the machining error caused by geometric location errors and improve the skiving precision effectively.

Key words: machine tool, power skiving, geometric location errors, inverse kinematics, error correction