蒙皮柔性夹持数控切边的工艺设计方法

针对可重构柔性工装配合五轴铣床实现蒙皮数控切边这一新技术,进行了工艺设计方法研究.首先介绍了数控可重构柔性工装的定位原理、结构原理以及基准传递协调原理.针对新技术应用中合理布局、精确定位和稳定夹持等3个问题,进行了工艺分析研究.突破了曲面零件装夹姿态定位算法、支撑立柱升程计算、自动化布局设计和装夹过程仿真等关键技术,开发了面向新装备新技术的工艺设计仿真系统.应用任意拉格朗日-欧拉法实现了蒙皮切边过程的有限元仿真,给出了仿真实例.选择某型号飞机镜面蒙皮零件,应用所提出的工艺设计方法进行了工艺试验,对试验结果进行了误差分析,结果表明加工精度满足制造要求.

Process planning of aircraft skins NC trimming based on reconfigurable fixture

For aircraft skins NC trimming based on the combination of the reconfigurable fixture(RF) and 5-axis gantry type milling machine,a process planning method was presented.Firstly,the locating principle,design configuration and positioning datum coordination of RF were introduced.Then the process planning analysis was detailed to solve the three problems: reasonable layout,accurate locating and stable fixturing.For the RF developed independently by our group,the implementation approaches were proposed for surface parts fixturing posture positioning,actuator rods strokes calculation,autonomic layout design,and workpiece loading process simulation.Moreover,a special supporting software system was developed.Using arbitrary Lagrangian-Eulerian method,the finite element simulation of aircraft skins perimeter milling was achieved.Finally,a cutting experiment of an aircraft skin part held by RF was done.The errors analysis results show that the machining accuracy can meet production requirements.