Study on Nonlinear Thermal Error of the Measurement Machine

摘要：

The higher measuring accuracy and velocity of the coordinate measuring machines are required for shorter cycle time in modern manufacturing industry. The high velocity will make the motors and the nuts bring more heat. The measuring accuracy of CMM is limited by the nonlinear temperature distribution components which cause the complicated deformation errors. According to the structural characteristics of a special structure coordinate measuringg machine, a thermal expansion body model is established in this paper based on the space transfer matrix. Furthermore, comply with the models of this CMM, the finite element simulation of the thermal expansion errors is carried out. The nonlinear temperature distribution and the deformation which are caused by the temperature gradient of the components can be identified clearly. Laser interferometer was used to measure the thermal deformation errors of CMM under the static condition. The experiment results show that the nonlinear deformation of the base and the column is the significant causes of the measuring error. According to this conclusion, we can provide more effective ways to prevent the nonlinear deformation error. Hence, it is useful to decreasing and restraining the thermal errors and to present a clearer and deeper knowledge of compensation for thermal errors.

关键词： Coordinate Measuring Machine Thermal Error Model Nonlinear Deformation Laser Interferometer

作者: Zhang Chenyang Chen Cheng Zou Hang

作者单位: School of Mechanical Engineering,Tianjin University of Commerce,Tianjin 300134,China School of Reliability and Systems Engineering,Beihang University,Beijing 100191,China

会议类型: 国际会议

会议名称: 2011 10th International Conference on Electronic Measurement & Instruments(第十届电子测量与仪器国际会议 ICEMI2011)

会议地点: 成都

会议语种:英文

页码: 510-514

在线出版日期: 2011-08-16（万方平台首次上网日期，不代表论文的发表时间）