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Accelerated test method for ball screw reliability

A ball screw pair, accelerated test technology, applied in the direction of machine gear/transmission mechanism testing, etc., can solve the problems of high cost, long reliability test time, insufficient test sample size, etc., to improve test efficiency and solve excessive test costs. High, easy-to-follow results

Active Publication Date: 2018-07-31
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to provide an accelerated test method for the reliability of the ball screw pair, which solves the problems of the current ball screw pair reliability test time is too long, the cost is too high, or the sample size of the short-term test is insufficient, and then the test method is improved. efficiency

Method used

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  • Accelerated test method for ball screw reliability
  • Accelerated test method for ball screw reliability
  • Accelerated test method for ball screw reliability

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Experimental program
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Effect test

Embodiment

[0033] Ball screw reliability accelerated test methods include the following:

[0034] 1. Determine the MRBF of the ball screw pair:

[0035] Table 1 Time taken by a certain blade factory to process typical blade parts

[0036] Speed ​​(RPM)

time (min)

100

25

200

5

400

3

0 (Loading and loading and intermittent time)

90

[0037] Calculated according to the MTBF of the CNC machine tool = 4000 hours, the number of revolutions of the corresponding ball screw pair is at least:

[0038]

[0039] Table 1 shows the time taken by a certain blade factory to process typical blade parts. Through the case analysis of typical workpieces processed by the above machining centers, it can be known that: when the MTBF of the CNC machine tool is 4000 hours, the corresponding number of revolutions of the screw is 9.17 million revolutions. For the ball screw reliability testing test, the screw needs to be run-in on the ball screw reliabil...

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Abstract

The invention discloses an accelerated testing method of the reliability of a ball screw pair. The method includes the steps of evaluating the reliability of the ball screw pair by means of a mean failure interval revolution evaluating method, conducting reliability modeling on the ball screw pair through a reliability acceleration model, determining the time, load, rotating speed and sample size of a test through a small-sample time terminated reliability testing method, calculating the stress acceleration coefficient and equivalent accelerated testing revolution of the test by means of a ball screw pair service life calculation formula, detecting the reasonability of test conditions (time, load and rotating speed), and finally conducting reliability accelerated testing on the ball screw pair through the determined test conditions. According to the ball screw pair reliability testing method based on an acceleration time model, the problems that the reliability testing time of a current ball screw pair is too long, expenses are too high or short-term test sample size is not enough are solved, and testing efficiency is improved.

Description

technical field [0001] The invention belongs to the field of reliability design test, in particular to a reliability accelerated test 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 development of reli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/02
CPCG01M13/02
Inventor 冯虎田周长光柯楠欧屹黄伟
Owner NANJING UNIV OF SCI & TECH
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