铣削加工力-位误差的综合建模与补偿  

Cutting Force Induced and Geometrical Errormodelling and Compensation for Milling Processing

作　　者：侯洪福 葛广言 杜正春[1] 杨建国[1] HOU Hongfu;GE Guangyan;DU Zhengchun;YANG Jianguo(Institute of Manufacturing Technology & Automation,Shanghai Jiao Tong University,Shanghai 200240,Cliina)

机构地区：[1]上海交通大学制造技术与装备自动化研究所,上海200240

出　　处：《机械设计与研究》2018年第6期109-114,共6页Machine Design And Research

基　　金：国家科技重大专项(2017ZX04016001)

摘　　要：基于铣削加工特点,建立铣削加工过程中的力-位综合误差模型,并基于原点偏移法建立了力-位综合误差在线补偿系统。根据铣削过程中的剪切和犁切机制,建立刀具微元切削力模型,通过积分得到切削力模型。依据变形理论,提出刀具及工件的切削力所致误差模型,并结合机床几何误差模型,利用齐次坐标变换,建立力-位综合误差模型。基于Fanuc数控系统的原点偏置功能开发误差在线补偿系统,实现力-位综合误差的在线补偿。利用立式加工中心对工件进行铣削加工实验,并对无误差补偿、仅补偿机床几何误差、仅补偿切削力所致变形误差、补偿力-位综合误差四种加工方式的加工精度进行对比,结果表明,力-位综合误差补偿的加工精度大大优于各单项误差补偿及无补偿的加工精度。Comprehensive geometrical-force errors model is analyzed based on workpiece milling and on-line compensation experiment is performed based on External Machine Zero Point Shift( EMZPS). An infinitesimal milling force model are proposed according to the shearing and ploughing mechanism during milling process. The overall milling force model is obtained by integrating the infinitesimal milling force. Cutting force induced error model of tool and workpiece are proposed in terms of the deformation theory. Comprehensive geometrical-force errors model is established by combining the machine geometrical error and cutting force induced error based on homogeneous coordinates transformation model. An error on-line compensation device is produced by using the function of EMZPS of Fanuc numerical system to compensate the comprehensive geometrical-force errors. Workpiece side milling experiment is conducted using VMC. Cutting accuracies among machine without error compensation,only with geometrical error compensation,only cutting force induced error and comprehensive geometrical-force error compensation are compared.The results show that comprehensive error compensation is superior to only one error compensation and none error compensation.

关 键 词：铣削加工 力变形 力-位误差模型 误差在线补偿 

分 类 号：TH115[机械工程—机械设计及理论]