Cold heading formation technology of grid structure bolt

A forming process and bolt technology, which is applied in the field of cold heading forming process of grid bolts, can solve the problems of insufficient connection strength, difficult to guarantee strength, impact on engineering quality, etc. Effect

Inactive Publication Date: 2017-11-21
南通安赛乐紧固件有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0002] High-strength bolts for steel grid bolt ball joints are commonly used fasteners in the machinery industry. The current processing method is generally formed by turning, and its strength is often difficult to guarantee. When the tensile strength exceeds a certain value, in the gap concentration Places such as the transition between the rod and the head or the root of the thread are likely to cause delayed fracture and fatigue fracture, which will seriously affect the quality of the project. In severe cases, it will cause safety accidents due to insufficient connection strength. Therefore, traditional high-strength Research and improve the production process of bolts, so as to efficiently carry out mass production under the premise of ensuring its quality, and meet the society's extensive needs for high-strength bolts for steel grid bolt ball joints

Method used

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Embodiment Construction

[0015] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments.

[0016] The cold heading forming process of grid bolts disclosed by the present invention specifically includes the following steps:

[0017] a. For material preparation, ML20MnTiB cold heading steel is selected as the bolt raw material;

[0018] b. Raw material reformation: surface pretreatment of the bolt raw material, specifically disc rounding → pickling → shelling → lubrication → rough drawing → pickling → lubrication → fine drawing;

[0019] c. Cold heading forming: Use a three-station cold heading machine to cold heading the pretreated raw materials, control the cold heading forming force to 120~260T, check the thread with a go-no-go gauge after each station is formed, and finally One station performs thread rolling operation on bolts to form semi-finished products;

[0020] d. Groove milling: use automatic numerical control...

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Abstract

The cold heading forming process of grid bolts disclosed by the present invention includes the steps of material preparation, raw material reformation, cold heading forming, groove milling, quenching, tempering, blackening treatment and post-treatment. The cold heading forming process of grid bolts provided by the invention solves the delayed fracture and fatigue fracture of bolts under high strength. It is not easy to break during use, and the connection is reliable, which improves the service life of bolts and can better meet the needs of today's society. The use of high-strength bolts for steel grid bolt ball joints is required.

Description

technical field [0001] The invention relates to a production method of bolts, in particular to a cold heading forming process of network frame bolts. Background technique [0002] High-strength bolts for steel grid bolt ball joints are commonly used fasteners in the machinery industry. The current processing method is generally formed by turning, and its strength is often difficult to guarantee. When the tensile strength exceeds a certain value, in the gap concentration Places such as the transition between the rod and the head or the root of the thread are likely to cause delayed fracture and fatigue fracture, which will seriously affect the quality of the project. In severe cases, it will cause safety accidents due to insufficient connection strength. Therefore, traditional high-strength The production process of bolts should be studied and improved to efficiently carry out mass production under the premise of ensuring its quality, so as to meet the extensive needs of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 王兵沈晓华周俊湖江林林沈晓亮
Owner 南通安赛乐紧固件有限公司
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