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Local quenching process for link plate hole surface

A local quenching and chain plate technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve problems such as poor wear resistance, broken chain accidents, increased impact and vibration during operation, and achieve convenient process control, mechanization, and enhanced hardness and the effect of wear resistance

Inactive Publication Date: 2010-08-11
HUANGSHAN JINGRUI CONVEYING MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented method uses quick-heating combined with cold water or liquid nitrogen during processing. It achieves this by rapidly increasing the temperature at one end while keeping it cooler than other parts of the material being treated. Only the part that needs strengthening becomes harder due to its own crystal lattice structure.

Problems solved by technology

In this patented technical problem addressed by the present inventors for use with machine tools during processing of abrasion resistant materials such as ceramic or metal powders. Current methods are limited due to low levels of thermal conductivity caused by insufficient contact area when treating these types of surfaces. Additionally, there may be other factors like lubrication issues which further complicates the process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Put the conveyor chain plate with carbon content We=0.5%, 207mmX50mmX8mm in the electronic tube type high-frequency inductor wound with hollow copper tube, adjust the current frequency to 200KHZ, and keep it for 15 minutes, so that the same High-frequency induction current, so as to rapidly heat the surface of the chain plate, and then immediately spray water to cool it, so that the surface layer of the chain plate can be hardened, the depth of the hardened layer is 2.0mm, and the hardness is 2.5HRC.

Embodiment 2

[0016] Put the conveyor chain plate with carbon content We=0.4%, 275mmX60mmX10mm in the electron tube type high-frequency inductor wound with hollow copper tube, adjust the current frequency to 400KHZ, keep it for 20 minutes, so that the same High-frequency induction current, so as to rapidly heat the surface of the chain plate, and then immediately immerse and quench in oil to harden the surface layer of the chain plate, the depth of the hardened layer is 0.8mm, and the hardness is 2.6HRC.

Embodiment 3

[0018] Put the conveyor chain plate with carbon content We=0.5%, 275mmX60mmX10mm in the electron tube type high-frequency inductor wound with hollow copper tube, adjust the current frequency to 300KHZ, keep it for 25 minutes, so that the same High-frequency induction current, so as to rapidly heat the surface of the chain plate, and then immediately spray water to cool it, so that the surface layer of the chain plate can be hardened, the depth of the hardened layer is 2.5mm, and the hardness is 2.4HRC.

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Abstract

The invention discloses a local quenching process for a link plate hole surface. The process comprises the following steps: placing a conveying link plate in a high frequency inductor; introducing an alternating current at a current frequency of between 100 and 500 KHz for 15 to 25 minutes; and immediately performing injection water cooling and oil quenching on the link plate hole surface so that the link plate hole surface is hardened by quenching. An ultra-fine cryptocrystalline martensite with a hardness of between 2 and 3 HRC and a hardening layer depth of between 0.5 and 2.5 millimeters can be obtained on the surface of the quenched conveying link plate, so surface hardness and wear resistance of the conveying link plate are enhanced. The process of the invention is convenient to control and easy to realize mechanization and automation.

Description

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Claims

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Application Information

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Owner HUANGSHAN JINGRUI CONVEYING MACHINERY
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