摘要
针对五轴侧铣加工非可展直纹面时刀具与设计曲面相互干涉的问题,提出了一种基于螺旋接触线的刀具定位方法。首先,基于Z-buffer法建立单个刀位下的误差解析模型,以评估刀具定位方法的优劣。其次,根据非可展直纹面的扭转特性,构造刀轴矢量的数学模型,同时分析刀具-工件接触线的性质及参数表达式。再次,考虑实际加工中的非线性加工误差,通过运动学变换对全局刀位进行路径插补优化。最后,基于改进两点偏置法、最小二乘法及所提出的方法进行仿真分析并对比3种方法所产生的误差,同时基于后2种方法进行实验验证。仿真和实验结果表明,所提出的方法能够有效减小侧铣加工中的原理误差,可为非可展直纹面的五轴侧铣加工提供一定的参考依据。
A tool positioning method based on spiral contact line is proposed to address the problem of mutual interference between tool and design surface during five-axis flank milling of undevelopable ruled surfaces.Firstly,an analytical error model under a single tool position was established based on the Z-buffer method to evaluate the advantages and disadvantages of the tool positioning method.Secondly,a mathematical model of the tool axis vector was constructed based on the torsional characteristics of the undevelopable ruled surfaces,and the properties and parametric expressions of the tool-workpiece contact line were analyzed.Thirdly,considering the non-linear machining errors in actual machining,the path interpolation optimization for the global tool position was carried out by kinematics transformation.Finally,the simulation analysis was conducted based on the improved two-point offset method,the least square method and the proposed method,and the errors generated by the three methods were compared,with the latter two methods being used for experimental verification.The simulation and experimental results show that the proposed method can effectively reduce the principle error in flank milling,which can provide a certain reference for five-axis flank milling of undevelopable ruled surfaces.
作者
李忠朋
张立强
刘钢
LI Zhongpeng;ZHANG Liqiang;LIU Gang(School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;Key Laboratory of Machinery Industry for Intelligent Manufacturing of Large Complex Thin-Walled Parts,Shanghai 201620,China;Institute of Chengdu Zhiyuan Advanced Manufacturing Technology,Chengdu 610511,China)
出处
《工程设计学报》
CSCD
北大核心
2024年第5期575-584,共10页
Chinese Journal of Engineering Design
基金
国家自然科学基金资助项目(51775328)。
关键词
五轴侧铣
非可展直纹面
螺旋接触线
路径优化
原理误差
five-axis flank milling
undevelopable ruled surface
spiral contact line
path optimization
principle error
