Test method for obtaining stable locking torque of self-locking nut
A self-locking nut, locking torque technology, applied in the direction of torque/torsional force measurement during tightening, can solve the problems of not very large, unsatisfactory, and difficult to obtain the locking torque value of the locking torque, so as to achieve convenient implementation, simple effect
Active Publication Date: 2015-05-20
GUIZHOU AEROSPACE PRECISION PRODS
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Problems solved by technology
[0002] For a long time, no matter at home or abroad, whenever the self-locking nut closing test is carried out, it is found that there is a large first-time locking torque (exceeding the first-time locking torque specified in the standard) during the self-locking nut locking torque test. From the comprehensive analysis of the entire 15 times of locking torque, it can be concluded that the attenuation of the locking torque from the second to the 15th time is not very large, mainly because the attenuation of the locking torque between the first time and the second time is large, and it is difficult to obtain Stable locking torque value
Therefore, the existing test method is difficult to obtain a stable locking torque value, which is still not ideal
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[0010] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0011] Test bolt mandrel 1 of the present invention sees figure 1 As shown, its manufacturing materials mainly include alloy steel (such as 40CrNiMoA, 30CrMnSiA), carbon steel (such as ML25, 10#), stainless steel (1Cr17Ni2), superalloy (GH2132, GH4169, GH738, etc.), and one end of the test bolt mandrel 1 It is the thread head 4, the thread head 4 of the test bolt mandrel 1 can be screwed into the tested self-locking nut 2, and the other end is a clamped hexagonal head or other shapes. greater than or equal to the strength of the tested self-locking nut 2), surface treatment (carbon steel and alloy steel are generally cadmium-plated and oxidized; stainless steel is the original color; superalloy silver-plated) can be used with the tested self-locking nut 2 .
[0012] The test device of the present invention is as figure 2 As shown, the pres...
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The invention discloses a test method for obtaining stable locking torque of a self-locking nut. The method includes adding 0.02-0.03mm on the minimum limit value obtained by adding lower deviation on screw large-diameter nominal size of a standard bolt core rod to obtain a new screw large-diameter size to manufacture a test bolt core rod. The test bolt core rod manufactured by the method replaces the standard bolt core rod to be matched with the self-locking nut to be tested, once screw-in and screw-out of the self-locking nut to be tested on the test bolt core rod serves as one circle, and locking torque of the self-locking nut to be tested is respectively detected by finishing 15 circles. By means of the technical scheme, attenuation of the locking torque obtained by a first test and a second test is reduced when the locking torque of the self-locking nut is rested, so that stable locking torque of the self-locking nut is obtained.
Description
technical field [0001] The invention relates to a test method for obtaining a stable locking torque of a self-locking nut, belonging to the technical field of self-locking nuts. Background technique [0002] For a long time, no matter at home or abroad, whenever the self-locking nut closing test is carried out, it is found that there is a large first-time locking torque (exceeding the first-time locking torque specified in the standard) during the self-locking nut locking torque test. From the comprehensive analysis of the entire 15 times of locking torque, it can be concluded that the attenuation of the locking torque from the second to the 15th time is not very large, mainly because the attenuation of the locking torque between the first time and the second time is large, and it is difficult to obtain Stable tightening torque value. Therefore, the existing test method is difficult to obtain a stable locking torque value, which is still not ideal. Contents of the inventi...
Claims
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IPC IPC(8): G01L5/24
Inventor 杨玖锡陈宵宵王凤
Owner GUIZHOU AEROSPACE PRECISION PRODS