摘要
针对复杂型腔类零件电火花加工中电极无干涉运动路径难规划的问题,提出一种电极运动轨迹搜索算法。使用NURBS参数化曲线曲面建模方法拟合叶片型面,建立叶片精确数学模型并计算流道中心线,基于流道中心线表达式提出轨迹搜索算法,开发了复杂型腔类零件多轴联动电火花加工专用CAM系统,成功实现4轴、5轴、6轴复杂型腔类零件的电极运动路径规划和无干涉加工过程仿真。进行整体带叶冠涡轮盘的加工试验,结果表明,叶形加工精度≤0.03 mm,总耗时249.3 h,满足闭式整体叶盘类零件指标要求。试验证明该算法可以快速搜索电极无干涉运动轨迹,有效避免电极干涉,从而提高轨迹搜索效率,工况适应能力强,可用于4~6轴各种工况下叶轮、叶盘等复杂型腔类零件的电极运动轨迹搜索。
To solve the difficult problem of non-interference movement path planning of electrodes of complex cavity-type parts in electric discharge machining(EDM),an electrode movement trajectory search algorithm is proposed.The algorithm is based on the non-uniform rational B-splines(NURBS) parametric curve surface method,which is used to fit the blade profile and establish the accurate mathematical model of the blade.The method of calculating the runner centerline is given,and the trajectory search algorithm is proposed based on the expression of the runner centerline.A special computer aided manufacturing(CAM) system for multi-axis linkage EDM machining of complex cavity parts was developed using the proposed algorithm.The electrode movement path planning and non-interference machining process simulation of 4-axis,5-axis and 6-axis complex cavity-type parts are carried out,and the machining experiment of the integral turbine disc with blade crown is conducted.The results show that the machining accuracy of the blade shape is less than 0.03 mm,and the total time is 249.3 h,which satisfies the index requirements of the closed integral blisk parts.Experiments show that the algorithm can quickly search for the motion trajectory of non-interference electrode,effectively avoid electrode interference,thereby improving the efficiency of trajectory search,and strong adaptability to working conditions,which can be used to search for trajectories of electrode motion of complex cavity-type parts such as impellers and blisks under various working conditions of 4 - 6 axes.
作者
刘雨婷
刘建勇
罗学科
李殿新
张慧杰
寇鹏远
LIU Yuting;LIU Jianyong;LUO Xueke;LI Dianxin;ZHANG Huijie;KOU Pengyuan(Beijing Institute of Petrochemical Technology,Beijing 102617,China)
出处
《航空制造技术》
CSCD
北大核心
2024年第12期93-101,共9页
Aeronautical Manufacturing Technology
基金
国家重点研发计划(2023YFB4605902)
北京市科技新星计划(20230484429)
北京石油化工学院致远科研基金(2023003)。
关键词
复杂型腔类零件
电火花加工
轨迹搜索
非均匀有理B样条曲线
流道中心线
Complex cavity-type parts
Electric discharge machining
Motion path search
Non-uniform rational B-spline curve
Runner centerline
作者简介
通讯作者:刘建勇,教授,博士,研究方向为特殊材料特种加工技术、数控系统开发、装备智能化、数字化设计、精密脉冲电源开发。
