Milling Error Compensation for Thin-walled Parts Considering Geometric Error and tool-workpiece deformation
In CNC machining, various errors, which are caused by the cutting process and the geometric precision of the machine tool, affect the machining accuracy of the machined parts, especially thin-walled parts, which are widely used in aerospace and aeronautics industry.In this paper, a milling error model considering geometric and cutting-force-induced error was analyzed for thin-walled parts and compensation experiment was performed based on External Machine Zero Point Shift (EMZPS).Firstly, an infinitesimal milling force model was proposed according to the shearing and ploughing mechanism during milling process and further cutting force model was obtained through the integration of infinitesimal unit.Thus the deformations of cutting tool and workpiece could be calculated and consequently the comprehensive geometric and force-induced error model was built.Next, an error compensation system was developed by using EMZPS function of Fanuc numerical system and the real-time compensation of the geometric and force-induced errors was realized.Finally, the peripheral milling experiment of thin-walled parts was conducted on the vertical machining center.The milling accuracies on four different conditions: without error compensation, only with geometric error compensation, only with cutting force induced error compensation and comprehensive error compensation were compared.The results indicate that the machining accuracy of the comprehensive compensation is much better than that of the single error compensation or without compensation.This method shows great potential in the future application in the machining of thin-walled low rigidity parts.
Thin-Walled parts milling force deformation geometric and force-induced error model real-time error compensation
Zhengchun DU Hongfu HOU Guangyan GE Jianguo YANG Steven Y.Liang
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China, 200240 School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China, 200240;George W.Wo
国际会议
上海
英文
355-365
2017-11-19（万方平台首次上网日期，不代表论文的发表时间）