A method for quickly and accurately measuring the deformation of a self-locking nut closing portion

Abstract

A kind of fast, accurate method for measuring the deformation of self-locking nut closing, first the self-locking nut with slot is tested for closing and locking test, the closing pressure of each self-locking nut is measured before test, the size of closing pressure of self-locking nut is finally determined by the size of locking force after test;When the parameter of closing pressure is solidified, the thickness H of detection tooling is solidified, the hole size d in detection tooling is interference fit with the outer diameter size of self-locking nut;Then the value S size after closing is measured by vernier caliper, the measured value should be consistent with the closing pressure obtained after previous test.The height and inner hole size of detection tooling are only adjusted, so the waste quantity of adjusting machine is reduced, the consistency of locking force can be guaranteed, the problems such as whole batch product scrapping caused by poor consistency of locking force can be avoided, so the production cost is saved, the delivery cycle is shortened, and the qualified rate of product is effectively improved.

Description

Technical Field

[0001] This invention relates to a method for rapidly and accurately measuring the shrinkage deformation of a self-locking nut. Background Technology

[0002] Ordinary nuts vibrate to varying degrees during operation. When this vibration generates force, the nut cannot properly engage with the bolt, eventually causing them to loosen or even fall off. This not only poses a significant risk of damage to the machinery but also seriously threatens the safety of construction workers. To prevent this, a nut with a self-locking function—the self-locking nut—was invented. Because of its inherent locking function, the self-locking nut effectively prevents loosening and resists vibration. Its significant function greatly improves the efficiency of construction and regular maintenance, leading to its widespread adoption. However, the locking force of a self-locking nut is crucial. Excessive locking force makes installation difficult and may damage the machinery; insufficient locking force makes installation easy but fails to effectively prevent loosening and resist vibration.

[0003] Unstable locking force of self-locking nuts can lead to the following problems: 1. The material and hardness of the self-locking nut may not be sufficient to withstand the high temperature and high pressure of the working environment, which may cause the nut to fail or loosen; 2. If the locking force is too small, the locking force of the self-locking nut may be weakened under external vibration or impact, causing the nut to loosen or even fall off; 3. If the locking force is too large, the locking element of the self-locking nut may deform or be excessively squeezed, causing damage to the locking element and making it unable to maintain a good locking effect, thus leading to damage or fatigue failure. Summary of the Invention

[0004] The present invention aims to solve the technical problem of rapidly and accurately measuring the deformation of the self-locking nut at the closing point.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A method for rapidly and accurately measuring the shrinkage deformation of a self-locking nut includes the following steps:

[0007] Step 1: Perform a trial tightening test on the slotted self-locking nuts. Before the test, measure the tightening force of each self-locking nut. Based on the tightening force after the test, determine the final tightening force of the self-locking nut.

[0008] Step 2: After the pressure measurement parameters are solidified, solidify the thickness H of the testing fixture. The hole size d in the testing fixture must be interference-fitted with the outer diameter of the self-locking nut.

[0009] Step 3: Use vernier calipers to measure the value S after compression. The measured value should be consistent with the compression amount obtained from the previous test.

[0010] The beneficial effects of adopting the above technical solution are:

[0011] The types and specifications processed by this invention are widely applicable, and the size of the product can be achieved within the detection range. Only the height and inner hole size of the detection fixture need to be adjusted, which reduces the number of scraps during machine adjustment and ensures the consistency of locking force. This avoids problems such as the scrapping of the entire batch of products due to poor locking force consistency. This saves production costs, shortens the delivery cycle, and effectively improves the product qualification rate. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the unsealed structure of a self-locking nut blank.

[0013] Figure 2 This is a schematic diagram of the closed structure of a self-locking nut blank.

[0014] In the diagram: 1-Self-locking nut, 2-Inspection fixture. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0016] A method for rapidly and accurately measuring the shrinkage deformation of a self-locking nut includes the following steps:

[0017] Step 1: Perform a trial tightening test on the slotted self-locking nut 1. Before the test, measure the tightening force of each self-locking nut 1. Based on the tightening force after the test, determine the tightening force of the self-locking nut 1.

[0018] Step Two: Once the pressure measurement parameters are finalized, the following will be applied: Figure 2 The thickness H of the inspection fixture 2 is cured. The hole size d in the inspection fixture 2 should be interference-fitted with the outer diameter of the self-locking nut 1 to reduce measurement error.

[0019] Step 3: Use a vernier caliper to measure the value S after compression. The measured value must be consistent with the compression amount obtained from the previous test. Only in this way can the consistency and stability of the self-locking nut's tightening force be guaranteed.

Claims

1. A method for rapidly and accurately measuring the shrinkage deformation of a self-locking nut, characterized in that: It includes the following steps: Step 1: Perform a test lock-up test on the slotted self-locking nut (1). Before the test, measure the amount of compression of each self-locking nut (1). After the test, determine the amount of compression of the self-locking nut (1). Step 2: After the pressure parameters are solidified, the thickness H of the testing fixture (2) is solidified. The hole size d in the testing fixture (2) must be interference-fitted with the outer diameter of the self-locking nut (1). Step 3: Use vernier calipers to measure the value S after compression. The measured value should be consistent with the compression amount obtained from the previous test.

Images