Research on machining error transmission mechanism and compensation method for near-net-shaped jet engine blades CNC machining process

Abstract

This study proposes an adaptive CNC machining process based on on-machine measurement to control the machining error of near-net-shaped blades. The multi-source and multi-process machining error transmission model of a near-net-shaped blade is established, and the reduction effect of the machining error transmission chain by the adaptive CNC machining process is qualitatively analyzed based on the machining error transmission flow model. The effects of the adaptive CNC machining process on the positioning benchmark error, machining position error, and machining contouring error are explored through the adaptive CNC machining process experiment. In particular, the ability of the adaptive CNC machining process to cooperatively control the blade position error and the contouring error is discussed in relation to the stiffness of the blade-fixture system. The results show that the adaptive CNC machining process can reasonably reduce the machining errors caused by the positioning benchmark. The final deviation band of the blade body is reduced by 60% based on the adaptive CNC machining process. The adaptive CNC machining process can optimize the contouring error and the position error of the blade tenon root under the enough premise of the stiffness of the blade-fixture system. The adaptive CNC machining process has the excellent ability to control machining errors to improve the machining quality of the blade.