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A method of pressing and forming screw-up self-tightening nuts and self-tightening washers

A technology of pressing and forming self-tightening nuts, which is applied in the direction of nuts, locking fasteners, screws, etc., can solve the problems of nut loosening and displacement, and achieve the effects of overcoming fastening, prolonging the practical life, and simple and reasonable forming process

Active Publication Date: 2021-07-27
ZHEJIANG ZIJINWANG MACHINARY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above situation, in actual operation, various methods are often used to tighten the locked nuts and bolts, such as using super glue, electric welding, secondary reinforcement through perforation, etc., but there is still no way to fundamentally solve the problem. Phenomenon of nut loosening and displacement

Method used

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  • A method of pressing and forming screw-up self-tightening nuts and self-tightening washers

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Embodiment

[0032] As shown in the figure, it is a press-forming method of a self-tightening nut 1 and a self-tightening washer 2. The self-tightening nut 1 is in the shape of a regular hexagon as a whole, and a first through hole 11 is arranged in the center, and a Screw thread; two or more first swivel bosses 12 that are connected head to tail are arranged directly above the self-tightening nut 1, and the whole surrounds a closed figure, wherein each section of the first swivel boss 12 has the same shape, the first The head-to-tail height difference of the swivel boss 12 is fixed, the height difference between the inside and the outside of the first swivel boss 12 is in a fixed ratio according to the effective width of the swivel surface, and the middle height of the first swivel boss 12 adopts linear Variety;

[0033] The self-tightening gasket 2 includes a top 21 and a bottom 22, the top 21 is a driven structure, the bottom 22 is a stop structure, the driven structure of the top 21 is...

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Abstract

The invention discloses a press-forming method for a self-tightening screw nut and a self-tightening washer. The self-tightening nut is in the shape of a regular hexagon as a whole, a first through hole is arranged in the center, and threads are arranged on the inner wall of the first through hole; the self-tightening washer Including the top and the bottom, the top is the driven structure, the bottom is the stop structure, the driven structure on the top is a regular hexagon as a whole, and the second through hole is set in the center, the diameter of the second through hole is larger than the nominal diameter of the self-tightening nut, and the inner wall is smooth , above the top, there are two or more second swivel bosses that are connected end to end, and the whole forms a closed figure; Compression molding method for nuts and self-tightening washers.

Description

technical field [0001] The invention relates to the field of manufacturing, and more particularly to a press-forming method of a self-tightening screw nut and a self-tightening washer. Background technique [0002] At present, there is a common safety hazard in the production process of refining and chemical enterprises at home and abroad. Flange fasteners are prone to loosening under high temperature or cryogenic conditions, resulting in hidden dangers of leakage and fire or leakage of high-temperature and high-pressure media. Large state-owned enterprises such as Sinopec or PetroChina use disc springs imported from American terracotta shields or French Lardy on key high-temperature or cryogenic flanges. Compress the gasket to solve the hidden danger of leakage, fire and explosion on site or leakage of high-temperature and high-pressure media. However, the disc spring is relatively expensive, and the disc spring is a one-time product. In addition, the use of the disc sprin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D53/24F16B39/282F16B39/24F16B33/00C21D9/00C21D1/18
CPCF16B39/282F16B39/24F16B33/00B21D53/24C21D9/0093C21D9/0068C21D1/18
Inventor 李政冀
Owner ZHEJIANG ZIJINWANG MACHINARY CO LTD
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