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Static seal fluorubber O-shaped ring service life prediction method

A prediction method, fluororubber technology, applied in the direction of testing the strength of materials by applying stable tension/pressure

Active Publication Date: 2016-02-24
广州国机密封科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention patent with the publication number CN104504296A discloses a Gaussian mixture hidden Markov model and regression analysis method for predicting the remaining life. The invention is aimed at electromechanical products, and the model it uses is not suitable for rubber O-ring products.

Method used

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  • Static seal fluorubber O-shaped ring service life prediction method
  • Static seal fluorubber O-shaped ring service life prediction method
  • Static seal fluorubber O-shaped ring service life prediction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Step (1): Use the compression fixture to obtain the recovery height data of the static seal fluororubber O-ring at different temperatures and different test times:

[0045] 1.1 The original axial cross-sectional diameter of a batch of statically sealed fluororubber O-ring products is used as the initial height h 0 =6.50mm, take the actual compression ratio of the installation groove κ=17% as the compression ratio used in the test; the actual service temperature T W It is 160°C (ie 433K);

[0046] 1.2 After using for a period of time, cut off a segment with a length of 2cm from the static seal fluororubber O-ring product as the sample to be tested, and measure the actual axial cross-sectional diameter h of each sample to be tested 1 is 6.38mm, then put the sample to be tested into the compression fixture, and compress it to the height h along the axial direction 2 5.40mm;

[0047] 1.3 Put the compression fixtures containing the samples to be tested into different hot ai...

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Abstract

The invention belongs to the technical field of rubber material life prediction, and discloses a static seal fluorubber O-shaped ring service life prediction method. The method comprises the following steps: performing an accelerated ageing test on an O-shaped ring sample by employing a compression clamp at different temperature, respectively obtaining a relation curve of recovery height and time logarithm; selecting a height value of a test terminal point and substituting the height value into a relation to obtain a corresponding time logarithm lgt; performing linear fitting on lgt and 1 / T to obtain a relation in a specification, and examining t to obtain a lower limit of a confidence interval. A prediction formula of the remaining life under operating temperature TW is shown in the specification. By using the O-shaped ring from disassembly under actual working conditions as the test sample, real compression ratio for arranging grooves is taken as test compression ratio, through fitting of a regression equation and parameter examination and determination of a y0 confidence interval, the lower limit of the confidence interval is used for predicting the service life, credibility of the life prediction result is higher, and the method has an engineering application value.

Description

technical field [0001] The invention belongs to the technical field of rubber material life prediction, in particular to a method for predicting the remaining service life of a static seal fluorine rubber O-ring. Background technique [0002] The service life refers to the maximum period that the O-ring can maintain the sealing ability in the working environment, and the remaining life refers to the maximum period that the O-ring can maintain the sealing ability after a period of use. Under the service conditions of static seal fluorine rubber O-ring products, the main factors causing performance changes are heat, oxygen, mechanical stress and contact with oil, water and other media. In a certain temperature range, the high-temperature accelerated aging of static sealing rubber products is the same as the aging mechanism under service conditions. Using the data obtained from the high-temperature accelerated aging test, the service life at the service temperature can be calcu...

Claims

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Application Information

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IPC IPC(8): G01N3/18
CPCG01N3/18
Inventor 连晓磊梁彬肖风亮成煜民
Owner 广州国机密封科技有限公司
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