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Micro-carburizing process for thin precision fasteners

A kind of fastener and precision technology, which is applied in the field of micro-carburizing process of thin precision fasteners, can solve the problems of head fracture, long time and high carbon concentration, and achieve the effect of reducing cost and shortening time.

Active Publication Date: 2021-03-19
HAMA NAKA MOTOGAWA METAL PROD KUNSHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention adds a special pre-carburizing process, combined with cyclic carburizing, so that a large number of fine carbide particles are formed in the surface carburized layer, which effectively refines the grain size from grade 7 to grade 9. On the basis of satisfying the performance of the core, It greatly improves the wear resistance of the surface. In this application, the carbon concentration is high in the process of cyclic carburizing and quenching, and the time is long. It is also easy to cause head fracture of precision fasteners with a thickness of less than 0.5mm.

Method used

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  • Micro-carburizing process for thin precision fasteners
  • Micro-carburizing process for thin precision fasteners

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Embodiment 1 A kind of micro-carburizing process of thin precision fasteners

[0047] Specifically include the following steps:

[0048] Step 1): Put the fastener material into an aqueous solution containing a water-soluble degreasing agent at 55°C for ultrasonic degreasing for 5 minutes, then put the degreased fastener material into the cleaning equipment, add water to wash for 3 minutes to remove the degreasing residue on the surface, and pull the net The frequency is 15 minutes / time, and washed again to obtain a cleaned fastener material;

[0049] Step 2): Place the fastener material cleaned in step 1) in a dehydrator for 5 minutes to obtain a dried fastener material;

[0050] Step 3): Lay the fastener material cleaned in step 2) on the mesh belt with a thickness of 0.5 cm to obtain the fastener material to be carburized;

[0051] Step 4): Put the liquefied petroleum gas into the furnace to control the temperature to 1040°C and decompose it by touching coal, raise ...

Embodiment 2

[0056] Embodiment 2 A micro-carburizing process for thin precision fasteners

[0057] Specifically include the following steps:

[0058] Step 1): Put the fastener material in an aqueous solution containing a water-soluble degreasing agent at 65°C for ultrasonic degreasing for 3 minutes, then put the degreased fastener material into the cleaning equipment, add water to wash for 1 minute to remove the degreasing residue on the surface, and pull the net The frequency is 15 minutes / time, and washed again to obtain a cleaned fastener material;

[0059] Step 2): Place the fastener material cleaned in step 1) in a dehydrator for 5 minutes to obtain a dried fastener material;

[0060] Step 3): Spread the fastener material cleaned in step 2) on the mesh belt with a thickness of 0.5-1 cm to obtain the fastener material to be carburized;

[0061] Step 4): Put the liquefied petroleum gas into the furnace to control the temperature to 1040°C and decompose it by touching coal, raise the t...

Embodiment 3

[0066] Embodiment 3 A micro-carburizing process for thin precision fasteners

[0067] Specifically include the following steps:

[0068] Step 1): Put the fastener material in an aqueous solution containing a water-soluble degreasing agent at 60°C for ultrasonic degreasing for 4 minutes, then put the degreased fastener material into the cleaning equipment, add water to wash for 2 minutes to remove the degreasing residue on the surface, and pull the net The frequency is 15 minutes / time, and washed again to obtain a cleaned fastener material;

[0069] Step 2): Place the fastener material cleaned in step 1) in a dehydrator for 4 minutes to obtain a dried fastener material;

[0070] Step 3): Lay the fastener material cleaned in step 2) on the mesh belt with a thickness of 0.8 cm to obtain the fastener material to be carburized;

[0071] Step 4): Put the liquefied petroleum gas into the furnace to control the temperature to 1040°C and decompose it by contacting coal, raise the tem...

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Abstract

The invention provides a micro-carburizing process for thin precision fasteners, and belongs to the technical field of metal treatment. The process is characterized in that liquefied petroleum gas decomposition gas is used as shielding gas in a carburizing treatment process, the temperature in a quenching furnace is controlled to be 875-885 DEG C, the carbon concentration is 0.65%-0.75%, the contact time is 18-22 min, and fastener materials subjected to carburizing treatment are cooled through an oil bath at the temperature of 60-80 DEG C to obtain carburized fastener materials. According to the process, in an implementation process, the temperature, the carbon concentration and the time are reasonably controlled, it is guaranteed that the thin precision fasteners cannot be broken on the premise that relatively high mechanical performance is guaranteed, the cost is reduced, and the time is shortened; and the micro-carburizing process is mainly used for conducting carburizing treatmenton thin precision fasteners with the head thickness of 0.5 mm or below, and the phenomenon that the heads of the precision fasteners are broken can be effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of metal treatment, and in particular relates to a micro-carburizing process for thin precision fasteners. Background technique [0002] With the rapid development of the fastener industry and the increasingly fierce market competition, coupled with the continuous improvement of customer requirements for the quality of fastener products such as lightweight, environmental protection, and long life, the processing technology needs to be constantly adapted to the market needs, and keep evolving. As a surface hardening method, carburizing has a long history, and it is the most widely used heat treatment process in machinery manufacturing, aero-engine or bearing and gear industries. [0003] The purpose of carburizing is to obtain a high carbon content on the surface of low-carbon steel or low-carbon alloy steel parts, and then obtain a carburized layer with high hardness and wear resistance through a series of ...

Claims

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Application Information

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IPC IPC(8): C23C8/20C23C8/02C23C8/80C21D1/18C21D1/74C21D9/00
CPCC21D1/18C21D1/74C21D9/0068C23C8/02C23C8/20C23C8/80Y02P10/20
Inventor 蔡俊信
Owner HAMA NAKA MOTOGAWA METAL PROD KUNSHAN