Acceleration testing and evaluating method of reliability of ball screw pair

A ball screw pair, accelerated test technology, applied in the direction of machine gear/transmission mechanism testing, etc., can solve problems such as increased stress, lack of calculation, and it takes months or even years to complete the test, and achieves improved accuracy. , to ensure the effect of accuracy

Active Publication Date: 2016-10-12
NANJING UNIV OF SCI & TECH
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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 technolog...

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  • Acceleration testing and evaluating method of reliability of ball screw pair
  • Acceleration testing and evaluating method of reliability of ball screw pair
  • Acceleration testing and evaluating method of reliability of ball screw pair

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Experimental program
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Embodiment

[0044] The accelerated test evaluation method for the reliability of the ball screw pair includes the following contents:

[0045] Determine the fault classification and termination conditions of the reliability test of the ball screw pair:

[0046] Timing censored reliability test method, the loading force is 5% Ca and 10% Ca respectively, the test cut-off revolutions are set to 1.2 million revolutions, and the rotational speed is 500rpm. Fault data: The number of revolutions (number of revolutions / fault number) of the three samples: 1.03 million revolutions / F5; 1.42 million revolutions / B5; 1.58 million revolutions / F5; 2.36 million revolutions / F5. All the samples produced irreparable faults when completing the specified number of revolutions, and there were 3 samples in total, ie m=3. All sample failures are summarized in Table 4 below:

[0047] Table 4 Reliability Accelerated Test Fault Statistics Table

[0048]

[0049] 1. Stress acceleration factor calculation:

[0...

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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...

Claims

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Application Information

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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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