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Test method and high temperature test device for locking torque test

A technology of locking torque and test method, which is applied in the direction of measuring torque/torsion force during tightening and using electric methods for temperature control, etc. It can solve the problems that the locking torque cannot be truly reflected and the reliability of the nut cannot be simulated.

Active Publication Date: 2018-01-02
河南航天精工制造有限公司
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Problems solved by technology

[0003] However, the initial screw-in torque measured by the test method disclosed in the above-mentioned measuring device is before heating, and the measured screw-out torque is after the connecting bolt is cooled, which cannot truly reflect the locking torque in a high-temperature environment. It is impossible to simulate the reliability of the nut under the high temperature environment working conditions of the engine

Method used

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  • Test method and high temperature test device for locking torque test
  • Test method and high temperature test device for locking torque test
  • Test method and high temperature test device for locking torque test

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Embodiment Construction

[0024] The embodiment of the test method of locking torque test of the present invention: as Figure 1-4 shown, including the following steps, (1), screw the nuts into the test bolts, and put the nuts and test bolts into the corresponding sleeves, click the "Start" button of the test device to start the test, the test device includes Force torque testing machine 2, at the moment when the bolt and the nut are unscrewed relative to each other, click the "Pause" button to record the maximum torque for the first screwing in, and click "Continue" to complete the first cycle; (2), then the self-locking The nuts are heated and baked in the high temperature furnace 4 for 6 hours at the standard specified temperature; (3) Cool the nuts to the indoor ambient temperature, lubricate the bolts and nuts with oil, set the cycle program for 15 times, and click the "Start" button first , turn half a circle when screwing in, put the bolts and nuts into the corresponding sleeves at the moment of...

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Abstract

The invention discloses a test method and a high-temperature test device for locking torque testing. In the high-temperature test process, firstly, the maximum assembly torque of the nut screwed into the test bolt is measured before heating, and then the nut sample is heated to the set point. Cool after a certain period of time; secondly, conduct multiple cycle tests and record the locking torque during the whole process; finally, heat the nut again, and measure the unscrewing torque at the heated temperature. The torque test is done at high temperature. By comparing and analyzing the torque change in the high temperature environment, the obtained data can better reflect the reliability of the nut in the high temperature environment.

Description

technical field [0001] The invention relates to a testing method and a high-temperature testing device for locking torque testing. Background technique [0002] With the rapid development of aerospace technology, the requirements for the connection between the substrates of aerospace engines are getting higher and higher, and the requirements for high-temperature performance of engine fasteners are also getting higher and higher. The domestic test method for fasteners is mainly to heat the test piece in a high temperature environment, then cool it, and then test the change of the locking torque after cooling (mainly simulating the reliability of the engine nut from high temperature to cooling). For example, Chinese patent CN203502160U (announcement date 2014.03.26) discloses a flange device connecting bolt high temperature relaxation force measuring device, which includes a heating furnace with a sealed furnace door, and a test flange device is installed in the furnace of th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L5/24G05D23/19
Inventor 高学敏冯德荣王慧娉杨冬梅
Owner 河南航天精工制造有限公司
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