Study on vibration stability of aircraft engine blades polished by robot controlled pneumatic grinding wheel

Abstract

Previous studies have found that the use of robot-controlled pneumatic grinding wheels for polishing aircraft engine blades can significantly reduce the machining time of the blades. However, the tool vibration problems that occur during the machining process can seriously affect the machining quality. Therefore, based on the previous research results of in-feed polishing, this paper deeply investigates two types of vibration problems in the in-feed pneumatic grinding wheel polishing process (1, the change of vibration strength caused by the change of robot stiffness; 2, the vibration enhancement caused by the unreasonable distribution of pneumatic grinding wheel cutting speed direction in the neighborhood of workpiece edge), establishes the stiffness equation of the six-degree-of-freedom robot, determines the displacement of the robot end node and the vibration strength of An empirical formula is proposed, a virtual reality modeling language (VRML) technology-based mold boundary line extraction method is proposed, the mold boundary neighborhood inlet polishing trajectory is optimized, the pneumatic grinding wheel inlet polishing trajectory planning and vibration optimization system is designed, and the vibration suppression of robot-controlled pneumatic grinding wheel inlet polishing is realized.