Rolling linear guide pair reliability acceleration test assessment method

Abstract

The invention discloses a rolling linear guide pair reliability acceleration test assessment method. According to the method, first, fault modes in a reliability acceleration test are classified, andcorresponding weighting coefficients are utilized to calculate the number of faults; second, load conditions of the reliability acceleration test are utilized to calculate stress acceleration factorsof the acceleration test; third, the acceleration factors are utilized to calculate average fault interval mileage under a single stress level or two stress levels; and last, average fault interval time under all samples is utilized to evaluate the reliability of a rolling linear guide pair. Through the rolling linear guide pair reliability acceleration test assessment method based on an acceleration life time model, the reliability problem of the rolling linear guide pair with a fault or without a fault currently can be effectively solved, and therefore the accuracy of the reliability test result is improved.

Description

technical field [0001] The invention belongs to the field of reliability test evaluation, in particular to a reliability acceleration test evaluation method of a rolling linear guide pair. Background technique [0002] Rolling linear guides are the core functional components of CNC machine tools, and the reliability of rolling linear guides will directly affect the reliability of the entire CNC system. The reliability indicator mean time between failure (MTBF) of high-end CNC machine tools has reached thousands of hours. According to the traditional test technology to test the rolling linear guide pair, it will take months or even years to test only one test sample. Complete the test; when multiple test samples are put in, the high test cost is also unbearable. Therefore, the traditional reliability test method can no longer meet the test requirements of the rolling linear guide pair, and the accelerated reliability test technology with large stress and shortened test time ...

AI Technical Summary

Problems solved by technology

The reliability indicator mean time between failure (MTBF) of high-end CNC machine tools has reached thousands of hours. According to the traditional test technology to test the rolling linear guide pair, it will take months or even years to test only one test sample. Complete the test; when multiple test samples are put in, the high test cost is also unbearable

Therefore, the traditional reliability test method can no longer meet the test requirements of the rolling linear guide pair, and the accelerated reliability test technology with large stress and shortened test time has become an inevitable trend in the development of reliability test verification technology.

[0003] At present, there are existing evaluation methods for accelerated test reliability of ball screw pairs in China. Since the transmission mode and failure mode of ball screw pairs are very different from those of rolling linear guide rail pairs, the calculation method of its failure mode and stress acceleration factor and Equivalent conversion factors, etc. cannot be used for rolling linear guides

Therefore, the research on the special evaluation method for the reliability acceleration test of rolling linear guides is blank, and there is a lack of effective methods for calculating the mean distance between failures (MMBF) and mean time between failures (MTBF) of rolling linear guides.

Images