关键词: 空心涡轮叶片, 蜡型, 陶芯, 夹紧布局优化, 形封闭, 粒子群算法

Abstract: Aiming at the clamping problem of ceramic core in wax pattern die of hollow turbine blade,a form-closure-based optimization method was proposed.A prediction model which the load on ceramic core in wax injection could be calculated was developed with finite element technique.A form-closure criterion to judge whether a clamping layout could fix the ceramic core or not was established based on rigid body kinematics.By utilizing the form-closure criterion and the contact forces between ceramic core and fix rods as constraints,a clamping layout optimization method was developed based on particle swarm optimization algorithm.The verification results showed that the layout of ceramic core optimized with the proposed method could meet the design requirements of keeping the contact pressures between ceramic core and fix rods,and reduce the number of clamping rods by comparing with the layout employed in engineering application.

Key words: hollow turbine blade, wax pattern, ceramic core, clamping layout optimization, form closure, particle swarm optimization