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50 steel computer CPU fastener heat treatment process

A process method and computer technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc.

Inactive Publication Date: 2007-10-24
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to overcome the shortcomings of the existing heat treatment process and provide a new heat treatment process for 50 steel computer CPU fasteners

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] The heat treatment process method of the present invention: 50 steel computer CPU buckle bainite austempering is completed on a continuous production line. Process: heating and holding at 870~900℃ for 15~30 minutes; isothermal at 300~340℃ for 2~4 minutes; cleaning, drying, and product inspection. The quenching heating furnace is a high-temperature mesh belt continuous furnace, using methanol furnace pyrolysis gas protection; conveyor belt isothermal tank for austempering, the salt bath composition (mass fraction) is 55% KNO 3 +45%NaNO 2 ; The cleaning is carried out on the conveyor belt first with hot water and then with clean water spray; the drying adopts an electric blast mesh belt continuous drying oven.

[0018] Serial number

Heating temperature

°C

Holding time

Minutes

Isothermal temperature

°C

Isothermal time

Minutes

Average hardness

(HRC control)

Microstructure

1

2

3

4

5

900

900

88...

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PUM

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Abstract

The invention discloses a thermal treatment method for 50-steel CPU fastener, which relates to complete the bainite austempering on one continual production line, and comprises steps as: heating the impact modeling workpiece to 870~900Deg and holding for 15~30min; isothermal holding for 2~4min at 300~340Deg, cleaning, baking, detecting the product. The product has 53.5HRC hardness and little deformation with 99.9% up-to-standard rate and well plasticity and toughness and hard to fragile.

Description

Technical field [0001] The invention relates to a heat treatment process method for a 50-steel computer CPU buckle. Background technique [0002] According to relevant information and related companies, the existing 50 steel computer CPU fasteners are made of 50# steel hot-rolled strips. After quenching and tempering heat treatment, they are electroplated with chromium and become the final computer fastener products. The number of the same batch of fasteners produced is about 30,000 to 60,000. Just during or after the assembly of the batch of fasteners, 8 to 10 pieces were found to be broken, accounting for a few ten thousandths. This kind of fracture is an early or abnormal fracture. The cross-sectional size of the computer buckle is about 5.2×0.8 (mm). Entrusted by related companies, we analyzed the early fracture of the computer buckle. According to the analysis and research, we found that the fracture occurred on the transition section between the two straight sections of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/20C21D10/00C21D9/00
Inventor 卢国辉黄惠平揭晓华
Owner GUANGDONG UNIV OF TECH
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