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High-strength high-tenacity bolt manufacturing method

A manufacturing method and high-toughness technology, applied in the field of bolt manufacturing, can solve the problems of short working life, poor ability to withstand shear force and impact force, limited working environment and use conditions, etc., to improve the usability and life, The effect of improving usability and practicality, and improving toughness

Inactive Publication Date: 2018-06-12
ANSTEEL HEAVY MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most of the raw materials of high-strength bolts are rolled materials, which are formed by rolling, cold drawing and other processes to meet the high-strength performance requirements (the impact value of 10.9 bolts in GB / T3098.1-2000 requires ≥20J), basically It cannot satisfy high strength and high toughness at the same time, and the working environment and usage are limited; the ability to withstand shear force and impact force is poor, and the working life is short

Method used

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  • High-strength high-tenacity bolt manufacturing method
  • High-strength high-tenacity bolt manufacturing method
  • High-strength high-tenacity bolt manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] See Figure 1-Figure 5 , the manufacturing method of high-strength high-toughness bolt, comprises the following steps:

[0026] 1) Select 42CrMo steel ingot 1, use a 1000t~3000t hydraulic press to open the billet, and then use a 300t~500t hydraulic press to continue billeting, and then perform pre-drawing. The drawn steel ingot 1 is divided into several sections along the axial direction, and each section of steel ingot 1 Turning, the original radial direction is taken as the axial direction, and each section of steel ingot 1 is elongated along the axial direction after turning, forged and shaped, and then tempered after overall forging;

[0027] 2) Quenching and tempering treatment. The forged steel ingot 1 is heated in an electric furnace to 850° C. for 5 hours, and then quenched and tempered by oil quenching and tempering for 30 minutes. The tempering temperature is selected as 500°C, and the temperature is kept for 10h. After this process, the mechanical propertie...

Embodiment 2

[0030] See Figure 1-Figure 5 , the manufacturing method of high-strength and high-toughness bolts, the difference from Example 1 is that during the quenching and tempering treatment, the forged steel ingot 1 is heated in an electric furnace to 840 ° C for 5 hours, and then quenched in oil for 30 minutes, and then tempered immediately Quenching and tempering process; tempering temperature is controlled at 490 ℃, heat preservation 10h; finally choose thread rolling forming thread processing.

Embodiment 3

[0032] See Figure 1-Figure 5 , the manufacturing method of high-strength and high-toughness bolts, the difference from Example 1 is that during the quenching and tempering treatment, the forged steel ingot 1 is heated in an electric furnace to 860 ° C for 4.5 hours, and then quenched in oil for 35 minutes, and then tempered immediately Quenching and tempering process; tempering temperature is controlled at 510 ℃, heat preservation 11h; finally choose thread rolling forming thread processing.

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Abstract

The invention relates to a high-strength high-tenacity bolt manufacturing method. The high-strength high-tenacity bolt manufacturing method comprises the following steps that a 42CrMo steel ingot is selected, a 1000 t-3000 t hydraulic press is adopted for cogging, then a 300 t-500 t hydraulic press is adopted for cogging continuously, then pre-drawing is carried out, the drawn steel ingot is divided into a plurality of section in the axial direction, each section of the steel ingot turns, the original radial direction serves as the axial direction, all sections of the steel ingot are drawn inthe axial direction obtained after turning, forging forming is carried out, and then overall after-forging normalized tempering is carried out; and thermal refining is carried out, and thread rollingforming is carried out for threaded machining. The high-strength high-tenacity bolt manufacturing method has the beneficial effects that the tenacity of a high-strength bolt is improved, the bolt hasthe general mechanical performance, the product usability and practicability are improved, the bolt can bear reasonable external force in all directions in use, the usability of the bolt is improved,and the service life of the bolt is prolonged.

Description

technical field [0001] The invention relates to a method for manufacturing bolts, in particular to a method for manufacturing high-strength and high-toughness bolts. Background technique [0002] At present, most of the raw materials of high-strength bolts are rolled materials, which are formed by rolling, cold drawing and other processes to meet the high-strength performance requirements (the impact value of 10.9 bolts in GB / T3098.1-2000 requires ≥20J), basically It cannot meet high strength and high toughness at the same time, and the working environment and usage are limited; the ability to withstand shear force and impact force is poor, and the working life is short. Contents of the invention [0003] In order to overcome the deficiencies in the prior art, the purpose of this invention is to provide a manufacturing method for high-strength and high-toughness bolts, increase the toughness of high-strength materials, improve the shear capacity and toughness of high-stren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 许松梅白凤财杜静波高扬苗丰王玲张慧张志力尚德柱
Owner ANSTEEL HEAVY MACHINERY CO LTD
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