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Machining process of self-tightening gasket and self-tightening nut

A processing technology, self-tightening nut technology, applied in the field of manufacturing, to achieve the effect of low cost

Active Publication Date: 2021-03-23
ZHEJIANG ZIJINWANG MACHINARY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the special use environment of self-tightening gaskets requires better surface treatment to improve service life

Method used

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  • Machining process of self-tightening gasket and self-tightening nut
  • Machining process of self-tightening gasket and self-tightening nut
  • Machining process of self-tightening gasket and self-tightening nut

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0067] As shown in the figure, a production process of a self-tightening nut and a self-tightening washer specifically includes the following steps:

[0068] 2.1) Material forming steps: select high-temperature resistant alloy steel, and control the carbon and carbide content in it, control the carbon quality at 0.3% to 0.5%, and add a small amount of chromium, molybdenum, vanadium, nickel, manganese, silicon, and add A small amount of molybdenum or tungsten forms a new heat-resistant alloy material; the new heat-resistant alloy material forms a self-tightening nut or a self-tightening washer after cold heading. The metals chromium, molybdenum, vanadium, nickel, manganese, and silicon are added, and a small amount of molybdenum or tungsten is added, and the total amount of added metals is controlled within 1% of the overall mass. Generally, the elements to be added can be added at a mass ratio of 1:1, that is, 1g of chromium, molybdenum, vanadium, nickel, manganese, and silico...

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Abstract

The invention discloses a machining process of a self-tightening gasket and a self-tightening nut. The machining process comprises a cold heading forming process and a heat treatment process of the self-tightening nut and the self-tightening gasket, and the self-tightening gasket is subjected to surface coating treatment. The machining process of the self-tightening gasket and the self-tighteningnut provided by the invention is resistant to high temperature and abrasion and low in cost.

Description

technical field [0001] The invention relates to the field of manufacturing, and more particularly to a processing technology of a self-tightening washer and a self-tightening nut. 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 spring is ...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D9/00C25D3/56C25D15/00C23C18/32C22C38/44C22C38/46C22C38/04C22C38/02B21D53/24B21D53/22B23P15/00
CPCC21D1/18C21D9/0093C21D9/0068C25D3/562C25D15/00C23C18/32C22C38/44C22C38/46C22C38/04C22C38/02B21D53/24B21D53/22B23P15/00
Inventor 李政冀
Owner ZHEJIANG ZIJINWANG MACHINARY CO LTD
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