关键词: 柔性夹具, 多点支撑, 航发叶片, 复合材料, 切削加工

Abstract:

After hot pressing molding of aeroengine composite blades， the profile error is large and the rigidity is weak， and the clamping of the blade in the tenon root milling and blade edge trimming poses significant challenge. Therefore， it is often necessary to reconstruct the profile through scanning and regenerate CNC machining codes， which leads to complex processing processes and non-universal CNC processing files， and thus， seriously affects the batch production efficiency. In this paper， a multi-point adaptive clamping and attitude adjustment system for aircraft composite blade machining is proposed. This system employs flexible array tooling with separate positioning and clamping， using elastic suction cups for clamping， and rigid locators for positioning to ensure high accuracy of the molded surface after tightening and positioning. Results show that the system can automatically adjust the machining position and posture according to the error of blade profile and tenon root. Results also show that this system can ensure that the tenon root and edges meet the performance requirements without modifying the CNC machining code； therefore， greatly reduces the difficulty of blade cutting and improves the machining efficiency.

Key words: flexible fixture, multi-point support, aeroengine blade, composite, cutting process