Weather-proof delayed-fracture-resistant high-strength bolt cold heading forming process

A high-strength bolt, delayed fracture technology, applied in bolts, threaded fasteners, metal processing equipment, etc., can solve the problems of anti-delayed fracture failure or damage, affecting the service life of bolts, poor weather resistance of bolts, etc. Defects, shorten the production cycle, improve the effect of strength

Inactive Publication Date: 2020-08-28
ANHUI CHANGJIANG FASTENERS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, during the use of bolts, they are often invalidated or damaged due to the poor weather resistance and delayed fracture resistance of the bolts, which affects the service life of the bolts and even brings more serious safety hazards

Method used

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  • Weather-proof delayed-fracture-resistant high-strength bolt cold heading forming process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A cold heading forming process for high-strength bolts with weather resistance and delayed fracture resistance, comprising the following steps:

[0026] S1. Cut off the round raw material to obtain a metal round bar for bolt forming. The metal round bar includes a head round bar and a stem round bar;

[0027] S2. Perform initial cold heading on the metal round bar so that one end of the round bar preliminarily forms a bolt head. The radial section of the preliminarily formed bolt head is hexagonal. The width of the preliminarily formed bolt head is 35mm. The preliminarily formed bolt head The height of the head is 25mm;

[0028] Then carry out secondary cold heading to make the bolt head fully formed, the width of the fully formed bolt head is 40mm, and the height of the fully formed bolt head is 20mm;

[0029] S3, chamfering the tail end of the rod of the product of S3, shrinking the rod and trimming the edge;

[0030] Put the preformed bolts into the calciner to rai...

Embodiment 2

[0034] A cold heading forming process for high-strength bolts with weather resistance and delayed fracture resistance, comprising the following steps:

[0035] S1. Cut off the round raw material to obtain a metal round bar for bolt forming. The metal round bar includes a head round bar and a stem round bar;

[0036] S2. Carry out the initial cold heading of the metal round bar so that one end of the round bar initially forms a bolt head. The radial section of the initially formed bolt head is hexagonal. The width of the initially formed bolt head is 40mm. The initially formed bolt head The height of the head is 20mm;

[0037] Then carry out secondary cold heading to make the bolt head fully formed, the width of the fully formed bolt head is 45mm, and the height of the fully formed bolt head is 15mm;

[0038] S3, chamfering the tail end of the rod of the product of S3, shrinking the rod and trimming the edge;

[0039] Put the preformed bolts into the calcination furnace to ra...

Embodiment 3

[0043] A cold heading forming process for high-strength bolts with weather resistance and delayed fracture resistance, comprising the following steps:

[0044] S1. Cut off the round raw material to obtain a metal round bar for bolt forming. The metal round bar includes a head round bar and a stem round bar;

[0045] S2. Carry out the initial cold heading of the metal round bar so that one end of the round bar initially forms a bolt head. The radial section of the initially formed bolt head is hexagonal. The width of the initially formed bolt head is 36mm. The initially formed bolt head The height of the head is 24mm;

[0046] Then carry out secondary cold heading to make the bolt head fully formed, the width of the fully formed bolt head is 42mm, and the height of the fully formed bolt head is 18mm;

[0047] S3, chamfering the tail end of the rod of the product of S3, shrinking the rod and trimming the edge;

[0048] Put the preformed bolts into the calciner to raise the tem...

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Abstract

The invention discloses a weather-proof delayed-fracture-resistant high-strength bolt cold heading forming process. The process comprises the steps of cutting off a wire rod raw material to obtain a metal round rod for bolt forming, wherein the metal round rod comprises a head round rod and a rod round rod; carrying out primary cold heading on the metal round rod to primarily form a bolt head at one end of the round rod; then carrying out secondary cold heading so that the bolt head is completely formed, wherein the width of the completely-formed bolt head is 40-45 mm, and the height of the completely-formed bolt head is 15-20 mm; and carrying out chamfering, rod part shrinking and trimming forming on the tail end of the rod part of the product in the S3, and then carrying out quenching and tempering treatment and surface treatment to obtain a weather-proof delayed-fracture-resistant high-strength bolt.

Description

technical field [0001] The invention relates to the technical field of fastener processing, in particular to a cold heading forming process for high-strength bolts with weather resistance and delayed fracture resistance. Background technique [0002] As the preferred process for fastener processing, cold heading process, especially for bolt processing, has the characteristics of high productivity, high material utilization rate, high surface quality and internal quality, and coherent and reasonable metal streamlines. [0003] In the prior art, bolts are often invalidated or damaged due to poor weather resistance and delayed fracture resistance during use, thereby affecting the service life of the bolts and even bringing more serious safety hazards. Especially in the occasions where the environmental conditions are relatively harsh, higher requirements are put forward for the protection of bolts. Contents of the invention [0004] The object of the present invention is to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/08B21J5/00B21K1/44
CPCB21J5/002B21J5/08B21K1/44
Inventor 曾晖汪豪豪杨照军陈元张楠楠
Owner ANHUI CHANGJIANG FASTENERS
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