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Manufacturing process of ultrahigh-strength fastener

A manufacturing process, ultra-high-strength technology, applied in the direction of manufacturing tools, threaded fasteners, connecting components, etc., can solve problems such as dependence on imports, and achieve strategic significance, foreign exchange savings, and cost-effective effects.

Inactive Publication Date: 2020-07-03
金晓亮 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The national standard of grade 12.9 already exists, but there are very few companies that can manufacture it, and most of them rely on imports

Method used

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  • Manufacturing process of ultrahigh-strength fastener
  • Manufacturing process of ultrahigh-strength fastener

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] Such as figure 1 , specifications below M12, the material is 20Mn2 steel;

[0018] When heating in a salt bath furnace, the quenching heating temperature is controlled at 880°C to 900°C;

[0019] After spheroidizing annealing (isothermal at 720°C for 4 hours), it is cooled to below 500°C with the furnace and then air-cooled.

[0020] Quenching out of the furnace; after being out of the furnace, the work body can be scattered on the wire grid, and the wire grid is quenched into the water together. When the hissing sound is about to end, take out the grid (the workpiece is about 200-300°C at this time) and air cool.

[0021] Cold heading thread rolling;

[0022] Tempering treatment: The workpiece that has been thoroughly cooled in the air should be tempered in time, and the tempering temperature depends on the steel

[0023] The upper limit or the lower limit of the manganese content and carbon content in the composition depends. Generally controlled at 360±20°C, the ...

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Abstract

The invention discloses a manufacturing process of an ultrahigh-strength fastener. The manufacturing process creatively adopts extremely common domestic steel 20MN2 and 30MN2, and the manufacturing process comprises the following steps of quenching, cooling, spheroidizing annealing, cold heading and thread rolling, carrying out heat treatment (heating, quenching and tempering), cleaning, carryingout surface treatment (blackening, galvanizing or nickel plating) and carrying out anti-corrosion treatment. The ultrahigh-strength fastener which is used by outer enterprise and is made of extremely-high-quality steel is manufactured, the monopoly position of the imported high-strength fastener is broken, the cost performance is extremely high, and the domestic blank is filled. At present, fastener production in China has large-scale enterprises, fasteners of 10.9 level and below are generally produced, the 12.9-level national standard fasteners exist, but almost no enterprise capable of producing and manufacturing the fasteners reaching 12.9-level national standard exists. The ultrahigh-strength nut and the ultrahigh-strength bolt are used in cooperation, the mechanical and physical properties are similar, and the manufacturing process is the same.

Description

technical field [0001] The invention relates to a manufacturing process of an ultra-high-strength fastener, covering the mechanical manufacturing industry including casting, forging, upsetting, and metal processing, and involving metallography, metallography, material mechanics, and heat treatment technologies. Creatively adopt very common domestic steel (for example: 20Mn2 and 30Mn2), and use a special heat treatment process to make ultra-high-strength fasteners that can only be made by foreign companies using extremely high-quality alloy steel, filling this technical field Domestic blank. Background technique [0002] Fasteners are used in electromechanical equipment, tooling and tools used in electronic products, metallurgy, chemical industry, construction, rail transit, aerospace, aviation and other industries, and fastening high-strength bolts, screws, studs and nuts The technical performance requirements of the components are very high. At present, large-scale enterp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/32C21D1/46C21D1/18C21D9/00F16B33/00F16B43/00
CPCC21D1/18C21D1/32C21D1/46C21D9/0093F16B33/00F16B43/00
Inventor 金晓亮徐忠芳
Owner 金晓亮
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