Processing technology of bolts for steel grid bolt spherical joints

A processing technology and bolt ball technology, applied in the field of steel grid connection processing, can solve problems such as insufficient connection strength, impact on engineering quality, and difficulty in ensuring strength, and achieve the effects of not being easy to break, optimizing the production process, and improving strength

Inactive Publication Date: 2019-02-19
JIANGSU HUAHAI STEEL STRUCTURE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the processing method of bolts for ball joints is generally formed by turning, and its strength is often difficult to guarantee. When the tensile strength exceeds a certain value, it is easy to cause delays in places where the gaps are concentrated, such as the transition between the rod and the head or the root of the thread. Fracture and fatigue fracture have a serious impact on the quality of the project. In severe cases, safety accidents may occur due to insufficient connection strength. Therefore, it is necessary to study and improve the production process of traditional high-strength bolts to ensure its quality. Under the premise, mass production can be efficiently carried out to meet the society's extensive needs for high-strength bolts for steel grid bolt ball joints

Method used

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Effect test

Embodiment 1

[0026] A processing technology for bolts used in steel grid bolt ball joints, the main components of the bolts used in the joints are Ni≤0.02, Mo≤0.14, Cr≤0.28, S≤0.014, P≤0.016, Mn 1.20, Si 0.30, C 0.07, Re0.22, the balance is Fe, the processing method of the bolt is: using less and no cutting, including three cold extrusion molding, one hot forging molding, that is, the first cold extrusion molding into a screw Forming, the second cold extrusion forming is the thread section forming of the screw, the third cold extrusion forming is the thread forming, and the hot forging forming is the bolt riser forming. Its specific processing steps are as follows:

[0027] (1) Material preparation: prepare the blanks according to the above composition groups, and remove the blanks according to the specifications and sizes of the bolts;

[0028] (2) Softening annealing: Isothermal spheroidizing annealing is carried out in a bell furnace, the softening annealing temperature is 745°C, the ho...

Embodiment 2

[0041] A processing technology for bolts used in steel grid bolt ball joints, the main components of the bolts used in the joints are Ni≤0.02, Mo≤0.14, Cr≤0.28, S≤0.014, P≤0.016, Mn 1.50, Si 0.40, C 0.12, Re0.28, the balance is Fe, the processing method of the bolt is: using less and no cutting, including three cold extrusion forming, one hot forging forming, that is, the first cold extrusion forming into screw Forming, the second cold extrusion forming is the thread section forming of the screw, the third cold extrusion forming is the thread forming, and the hot forging forming is the bolt riser forming. Its specific processing steps are as follows:

[0042] (1) Material preparation: prepare the blanks according to the above composition groups, and remove the blanks according to the specifications and sizes of the bolts;

[0043] (2) Softening annealing: Isothermal spheroidizing annealing is carried out in a bell furnace, the softening annealing temperature is 760°C, the hold...

Embodiment 3

[0056] A processing technology for bolts used in steel grid bolt ball joints, the main components of the bolts used in the joints are Ni≤0.02, Mo≤0.14, Cr≤0.28, S≤0.014, P≤0.016, Mn 1.90, Si 0.50, C 0.20, Re0.30, and the balance is Fe. The processing method of the bolt is: less cutting and no cutting, including three cold extrusion moldings and one hot forging molding, that is, the first cold extrusion molding is a screw Forming, the second cold extrusion forming is the thread section forming of the screw, the third cold extrusion forming is the thread forming, and the hot forging forming is the bolt riser forming. Its specific processing steps are as follows:

[0057] (1) Material preparation: prepare the blanks according to the above composition groups, and remove the blanks according to the specifications and sizes of the bolts;

[0058] (2) Softening annealing: Isothermal spheroidizing annealing is carried out in a bell furnace, the softening annealing temperature is 775°C...

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Abstract

The invention relates to a processing technology of bolts for steel grid bolt spherical joints. The bolts for the joints mainly comprise the components of Ni, Mo, Cr, S, P, Mn, Si, C, Re and Fe. According to the processing method of the bolts, chipless forming is adopted and comprises three times of cold extrusion molding and one time of hot forging molding, wherein the first time of cold extrusion molding is screw rod molding, the second time of cold extrusion molding is screw-rod thread segment molding, the third time of cold extrusion molding is thread molding, and the hot forging molding is screw cap molding. The processing technology mainly adopts a cold extrusion process for bolt production, improves the strength of the bolts, optimizes the production process of the bolts and solvesthe delayed fracture and fatigue fracture of the bolts under high strength, fracture does not happen easily during use, the connection is reliable, the service life of the bolts is prolonged, and userequirements of people in the current society for the high-strength bolts for the steel grid bolt spherical joints can be better met.

Description

technical field [0001] The invention belongs to the technical field of steel grid connection parts processing, and in particular relates to a processing technology of bolts used for steel grid bolt ball joints. Background technique [0002] The node is an important structural component in the steel frame structure. It plays the role of connecting the cross members and transmitting the internal force of the members. Therefore, the structure of the nodes has a direct impact on the mechanical performance, fabrication and installation, project progress, steel consumption index and project cost of the entire grid. [0003] At present, the processing method of bolts for ball joints is generally formed by turning, and its strength is often difficult to guarantee. When the tensile strength exceeds a certain value, it is easy to cause delays in the places where the gaps are concentrated, such as the transition between the rod and the head or the root of the thread. Fracture and fati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00F16B35/00
Inventor 姜志勇
Owner JIANGSU HUAHAI STEEL STRUCTURE CO LTD
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