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Process for manufacturing high-strength bolt

A high-strength bolt and manufacturing process technology, applied in the field of bolt manufacturing technology, can solve problems such as bolt longitudinal fatigue, achieve consistent tensile strength, ensure fatigue strength, and improve fatigue strength

Active Publication Date: 2010-08-11
浙江裕泰汽车配件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For this reason, the technical problem to be solved by the present invention lies in the problem that the bolts produced by the grinding method in the manufacturing process of high-strength bolts in the prior art are prone to longitudinal fatigue, thus proposing a method that can improve the tensile fatigue strength of the bolts Manufacturing process of high-strength bolts

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  • Process for manufacturing high-strength bolt
  • Process for manufacturing high-strength bolt
  • Process for manufacturing high-strength bolt

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Embodiment Construction

[0034] figure 1 , figure 2 It is a specific embodiment of the manufacturing process of the high-strength bolts described in the present invention. Taking the production of a bolt used for the cylinder head of an automobile engine as an example, the bolt includes a bolt head 1 and a stem 2, and the stem The length of the part 2 is about 102 mm, including a guide neck 3 with a length of about 5 mm and a screw 4 with a diameter of 97 mm. The guide neck 3 is a cylinder with a diameter of about 9.6 mm, and the screw 4 is a cylinder with a diameter of about 8.4 mm. The bolt head The part 1 is cylindrical, with a diameter of about 15mm and a length of 13.5mm. It has an open cavity built in. The cavity is from the outer surface of the bolt head 1 to the inner 12-point flower-shaped chamfer, and the inner 12 Corner flower-shaped cylinder 6 and bottom cone 7, such as figure 1 shown. The manufacturing process steps of described bolt are as follows:

[0035] ①Choose the appropriate s...

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Abstract

The invention provides a process for manufacturing a high-strength (above) bolt. The process comprises the following steps: selecting a proper steel material, and cutting out a cylindrical blank with proper size; molding the head part and the rod part of the bolt by adopting cold extrusion technology; heating; manufacturing the rod part, including coarse grinding and fine grinding; detecting injury by magnetic powder; manufacturing screw; and performing surface mechanical reinforcement and corrosion resistance treatment. The process solves the technical problems of insufficient strength and fatigue fracture which are easily generated on the bolt existing in the prior art for manufacturing the high-strength bolt, and is a high-strength bolt manufacturing process capable of improving tensile and fatigue strength resistance of the bolt.

Description

technical field [0001] The invention relates to a bolt manufacturing process, in particular to an ultra-high-strength bolt manufacturing process. Background technique [0002] A bolt is a type of fastener consisting of a head and a shank, usually in cooperation with a nut, and is used to fasten and connect two parts with through holes. Bolts are divided into high-strength bolts and ordinary bolts according to their performance. Chinese patent document CN1443946A discloses a manufacturing process for high-strength bolts above 1300 MPa, which includes blanking process, blank processing process, annealing process, cold heading forming process, turning rod part process, quenching and tempering process, grinding process, flaw detection process, thread rolling process, rolling fillet process and shot peening process to form composite strengthening process, surface treatment process and flaw detection process, and the annealing process before the cold heading forming process adopt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
Inventor 沈永瑞
Owner 浙江裕泰汽车配件有限公司
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