Bolt machining method and bolt machined by bolt machining method

A bolt and thread technology, applied in the field of bolt processing, can solve the problems that restrict the development and safe service of high-end automotive mechanical equipment, high-strength bolts have short life, poor reliability, etc., to eliminate the risk of failure, improve yield strength, and reduce stress concentration Effect

Inactive Publication Date: 2018-06-29
深圳航空标准件有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0002] Represented by steel high-strength bolts, the number of general stress cycles N=5×10 6 For a long time, my country's high-strength bolts have three major problems: short life, poor reliability and heavy structure.
Three major problems seriously restrict the development and safe service of high-end automotive machinery and equipment
[0003] In summary, the existing bolt processing method obviously has inconvenience and defects in actual use, so it is necessary to improve it.

Method used

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  • Bolt machining method and bolt machined by bolt machining method
  • Bolt machining method and bolt machined by bolt machining method
  • Bolt machining method and bolt machined by bolt machining method

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Embodiment Construction

[0041] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0042] see figure 1 , Figure 2A ~ Figure 2C , in the first embodiment of the present invention, the present invention provides a method for bolt processing, comprising:

[0043] In step S101, the raw material of the bolt to be processed is subjected to cold pier processing, so that the head 10 of the bolt is formed and the shank 30 of the bolt is preformed, and the combination of the head 10 and the shank 30 is enlarged The first radius R1 of the transition arc at , made into preformed bolts;

[0044] In step S102, increasing the heat treatment temperature to heat-treat the preformed bolts to i...

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Abstract

The invention is applicable to the technical field of machines, and provides a bolt machining method and a bolt machined by the bolt machining method. The bolt machining method comprises the steps that A, a predetermined raw material to be manufactured into the bolt is subjected to cold heading machining so that the head of the bolt is formed and a rod part of the bolt is preformed, the first radius of a transition arc of the connection part of the head and the rod part of the bolt is increased, and thus a preformed bolt is manufactured; B, the heat treatment temperature is increased for carrying out heat treatment on the preformed bolt to improve the yield strength of the preformed bolt; and C, the preformed bolt subjected to the heat treatment is subjected to thread rolling machining sothat the rod part of the bolt is formed, the second radius of an arc of the root of the thread in the rod part of the bolt is increased, and thus the bolt is manufactured. By doing so, the service life of the bolt is prolonged to the stress-number of cycles N which is equal to 107.

Description

technical field [0001] The invention relates to the field of mechanical technology, in particular to a bolt processing method and bolts thereof. Background technique [0002] Represented by steel high-strength bolts, the number of general stress cycles N=5×10 6 , For a long time, my country's high-strength bolts have three major problems: short life, poor reliability and heavy structure. Three major problems seriously restrict the development and safe service of high-end automotive machinery and equipment. High-strength bolts determine the main connection functions of high-end automotive machinery and equipment, reflecting the life, reliability and economic affordability of automotive machinery and equipment, and are the core of high-end machinery manufacturing. [0003] In summary, the existing bolt processing methods obviously have inconvenience and defects in actual use, so it is necessary to improve them. Contents of the invention [0004] In view of the above-menti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00F16B35/00
CPCB23P15/00F16B35/00
Inventor 郑琼娥
Owner 深圳航空标准件有限公司
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