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Articles:2018,Vol:23,Issue(3):168-171 |
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Citation: |
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ZHAO Zhe. Mathematical Statistics Method of Residual Static Torque Controlling[J]. International Journal of Plant Engineering and Management, 2018, 23(3): 168-171 |
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| Mathematical Statistics Method of Residual Static Torque Controlling |
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| ZHAO Zhe |
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| Automotive Engineering Institute, Guangzhou Automobile Group Co., Ltd, Guangzhou 511434, China |
| Abstract: |
| This paper analyzes the problems existing in the detection and determination on the traditional residual torque. It is pointed out that the detection value is mistakenly used as the truth value and the lower limit of design torque is mistakenly used as the residual torque criterion. The calculation formula of the determination (limit) value of the test value of RM and DFM is proposed. By defining related parameters,the torque limit value corresponding to the tightening level, the ratio of the measured value to the truth value, μ and σ related to the ratio of A and C, and the confidence coefficient related to the confidence probability, a mathematical statistical method of residual static torque controlling is established, which improves the control precision on the residual torque. |
| Key words:
residual torque
mathematical statistics
determination
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| Received: 2017-05-22
Revised:
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| DOI: 10.13434/j.cnki.1007-4546.2018.0307 |
| Corresponding author:
Email： |
| Author description: ZHAO Zhe is a senior engineer and chief engineer, Automotive Engineering Institute, Guangzhou Automobile Group Co., Ltd. His research interest is the fastening system of automotive. zhaozhe1@126.com
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References: |
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[1] QC/T518-2013. Tightening torque for automotive threaded fasteners[S]. State Administration of Machinery Industry, 2013(in Chinese) |
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