Method for evaluating the reliability of ball screw pair by accelerated test

Abstract

The invention discloses an acceleration testing and evaluating method of the reliability of a ball screw pair. The method includes the following steps of classifying failures in a reliability accelerated test, calculating the failure number through a determined weighting coefficient, calculating a stress acceleration coefficient of the accelerated test through the load conditions of the reliability accelerated test, calculating single-stress or double-stress horizontal mean failure interval revolution through the acceleration coefficient, and evaluating the reliability of the ball screw pair through mean time between failures under all samples. According to a ball screw pair reliability accelerated testing and evaluating method based on an acceleration service life model, the current reliability problem of the ball screw pair with or without failures can be effectively solved, and then the accuracy of the reliability testing result is improved.

Description

technical field [0001] The invention belongs to the field of reliability design test, in particular to a reliability acceleration test evaluation method of a ball screw pair. Background technique [0002] The ball screw pair is the core functional part of the CNC machine tool, and the reliability of the ball screw pair will directly affect the reliability of the entire CNC system. The mean time between failures (MTBF) of high-end CNC machine tools has reached thousands of hours. According to the traditional test technology to test the ball screw pair, it takes months or even years to put in a test sample. The test can only be completed, and when multiple test samples are invested, the high sample cost is also unbearable. Therefore, the traditional reliability test method can no longer meet the requirements of the ball screw pair, and the accelerated reliability test technology that increases the stress and shortens the test time has become an inevitable trend in the develop...

AI Technical Summary

Problems solved by technology

The mean time between failures (MTBF) of high-end CNC machine tools has reached thousands of hours. According to the traditional test technology to test the ball screw pair, it takes months or even years to put in a test sample. The test can only be completed, and when multiple test samples are invested, the high sample cost is also unbearable

Therefore, the traditional reliability test method can no longer meet the requirements of the ball screw pair, and the accelerated reliability test technology that increases the stress and shortens the test time has become an inevitable trend in the development of reliability test verification technology.

[0003] After reviewing the relevant information, it is found that the domestic research on the accelerated test evaluation method of the reliability of the ball screw pair is in a blank state. Clear, lack of effective methods for calculating the mean number of revolutions between failures (MRBF) and mean time between failures (MTBF) of ball screw pairs, etc.

Images