Method for improving anti-loosening performance of thread pair and auxiliary spring washer thereof

Abstract

The invention discloses a method for improving the anti-loosening performance of a thread pair and an auxiliary spring washer thereof, the auxiliary spring washer comprises a bolt (1), a main nut (4), an auxiliary nut (5) or a main anti-loosening washer (2), the auxiliary spring washer (8) is arranged between the main nut (4) and the auxiliary nut (5), and the auxiliary spring washer is characterized in that the auxiliary spring washer (8) is thicker or wider than the main anti-loosening washer (2) made of the same material. The method comprises the following steps: firstly, vibrating on a transverse vibrator to measure a unidirectional non-rotating pre-tightening force A, calculating a pre-tightening force attenuation value d = A-B, B being a stable value after attenuation, then pre-tightening a main nut (4) to A + d value again, at the moment, setting a torque reading as U, and then reversely returning to the pre-tightening force A, at the moment, setting a torque reading as V; the auxiliary nut (5) is pre-tightened by a value larger than the pre-tightening torque U, and then the auxiliary nut (5) returns to a value larger than the torque V, so that the influence of rotating and non-rotating factors on the clamping force is eliminated, the first-stage curve of the clamping force is kept at a high value close to 100%, and the anti-loosening performance of the thread pair is greatly improved.

Description

technical field [0001] The invention relates to an anti-loosening fastener, in particular to a method for improving the anti-loosening performance of a thread pair, and an auxiliary spring washer thereof. Background technique [0002] The existing anti-loosening double nuts are friction-proof, and the anti-loosening performance is better. There are rubber washers or metal spring washers between the two main and auxiliary nuts of the same rotation direction. After the main nut is pre-tightened, the auxiliary nut is over The pre-tightening force of the main nut is tightened, so that there is a jacking force between the two nuts, so that the main nut at the bottom and the main spring pad generate friction, and produce elastic expansion friction with the auxiliary nut above, and the double friction achieves pre-tightening As a result, the two nuts will have a force to squeeze each other, so as to prevent loosening. In my invention patent application with application number 2021...

AI Technical Summary

Problems solved by technology

[0007] In order to ensure that the preload force of the fasteners in the first stage is not affected by the various factors mentioned above, and the preload force drops rapidly, to ensure that the second stage of the remaining clamping force has a high-value clamping force at the beginning, German workers The method of twisting the fastener three times and retreating half a turn is used to eliminate the influence of various factors, but this method does not specify when to start three turns, when to end three turns, and retreat half a turn It is also not clearly stated that starting from a certain position or the amount of pre-tightening force to retreat half a circle, and stopping at what position or pre-tightening force to stop retreating half a circle. Everything is artificially estimated, so the first tightening The anti-loosening performance is not necessarily the same as the anti-loosening performance of each subsequent fastening, but there are differences in the pre-tightening installation process

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