Abstract: The precision reducer is the core component of the robot, and its transmission accuracy determines the motion accuracy of the robot. The testing machine for precision reducer is the basic equipment for testing the transmission accuracy of precision reducer. However, so far, there is no systematic research on the accuracy characteristics of testing bench for transmission accuracy. Therefore, the verification regulation to evaluate the accuracy performance of such testing machine is still a gap. This leads to inaccurate results and inconsistent evaluation in the accuracy evaluation of the precision reducer testing machine. In order to accurately evaluate the accuracy performance of testing machine for precision reducer, an accuracy evaluation system for the whole life cycle of testing machine is constructed. The accuracy performance of testing machine is traced back to three aspects: test condition stability, measurement chain accuracy and frequency domain state. The corresponding characteristic quantities are defined for each aspect, and a rapid extraction method of characteristic quantities for the production site is proposed. The relationship between the characteristic quantities and the accuracy of testing machine is established. The accuracy failure criterion of testing machine is determined. Based on the comprehensive performance testing machine for precision reducer developed by the research group, the test practice for 5 years has been carried out. The results show that the value of the characteristic quantity is consistent with the actual accuracy of testing machine, which verifies the validity and reliability of the whole life cycle accuracy evaluation system of testing machine.

Key words: precision reducer, testing machine, transmission accuracy, whole life cycle, accuracy evaluation system