Design of Integrated Error Compensating System for the Portable Flexible CMMs
During the working of portable flexible CMM, the mechanical arms gravity and operating load generate dynamic strain, the thermal distortion also results in its length change. The caused errors would severely deteriorate the measuring accuracy. An error compensating system of the mechanical arm is designed in this paper, based on the monitor of dynamic strain and environ-mental temperature. The mathematical model of portable flexible coordinate measuring machine (CMM) was established.For the dynamic strain, four resis-tance strain gauges are sticked symmetrically on the root of each mechanical arm to monitor the dynamic strain. Then length error caused by the measuring arms gravity or external operation load can be calculated through the analysis of stress. Strain compensation can be realized, when they are fed back to the measurement procedures. For thermal distortion, the temperature values ac-quired by the single-linear digital thermometer are substituted in the correction formula to calculate the relevant compensation dosage. Finally, these compen-sation dosages are feedbacked to the measuring program to have these errors compensated continually. The integrated error compensation system can im-prove the measurement accuracy of portable flexible CMM effectively.
flexible arm coordinates measuring machine strain temperature error compensation.
Qing-Song Cao Jie Zhu Zhi-Fan Gao Guo-Liang Xiong
College of Mechanical and Electrical Engineering, East China Jiaotong University,Nanchang 330013, China
国际会议
南昌
英文
410-419
2010-10-22（万方平台首次上网日期，不代表论文的发表时间）