Research On Accelerated Life Test Of Precision Reduce

As one of the key areas vigorously promoted,the development of industrial robots’ core technology plays a vital role in China’s response to the challenges of the new round of technological revolution and the transformation and upgrading of the manufacturing industry.The precision reducer represented by the precision planetary cycloid reducer is one of the core components of industrial robots,and its performance will directly affect the service life and reliability of the entire industrial robot.However,currently,domestic precision reducers still have shortcomings compared to advanced foreign levels in terms of lifespan and accuracy retention.There is no effective calculation and detection method for the lifespan detection of precision reducers in China.If the lifespan of precision reducers is directly measured,the test will take a long time and the operation will be complex.Therefore,conducting accelerated lifespan test research on precision reducers and achieving feedback of test results to the design and manufacturing processes is of great significance for improving the lifespan and reliability of industrial robots.In response to the above issues,this article proposes a set of accelerated life test plans for precision planetary cycloidal reducers based on Miner’s fatigue cumulative damage theory.Taking precision planetary cycloidal reducers as an example,the accelerated life test is conducted on them.By processing and analyzing the collected life data of precision planetary cycloidal reducers,the life of precision planetary cycloidal reducers is effectively evaluated.The specific research content is as follows:(1)Failure mechanism and fatigue life simulation analysis of precision reducers: By analyzing the transmission principle and operating conditions of precision reducers,the wear failure forms of key internal components were understood,and their failure mechanism was determined;Then a rigid flexible coupling model of the precision planetary cycloid reducer was established,and the rationality of its modeling was verified using Adams software.At the same time,the stress changes of key components were obtained.Then,the fatigue life of the precision planetary cycloid reducer was simulated and analyzed using Ncode fatigue simulation software,verifying the feasibility of accelerated life testing.(2)Optimization design of accelerated life test for precision planetary gear reducers: The life distribution and accelerated life model of precision planetary gear reducers were analyzed and studied.Without damaging their failure mechanism,a power law Weibull model of precision planetary gear reducers was established,and a constant stress accelerated life test plan was established.Reasonable accelerated stress values and test samples were selected,and their failure criteria were clarified.(3)Precision reducer acceleration life test: Firstly,the key components of the test bench were designed based on the set acceleration life test plan,and an acceleration life test bench was built;Secondly,according to the accelerated life test process and the built test bench,the accelerated life test is conducted.During this period,the performance parameters of the reducer are measured using a comprehensive performance measurement test bench,and the life data is recorded in real-time.(4)Precision reducer acceleration life test data processing and life evaluation: Based on the collected life data,graphical analysis method is used to verify the life data,draw a Weibull probability map,and verify that the sample reducer life follows the Weibull distribution;And the Gibbs sampling algorithm and particle swarm optimization algorithm were used to solve the problem of inaccurate calculation of small samples.The Weibull distribution parameters of precision planetary cycloid reducers were solved,and the life characteristic data of reducers under normal stress were obtained.