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Laser cladding treatment process for heating furnace hearth roll collar surface

A technology of laser cladding treatment and furnace bottom roll, which is applied in the direction of metal material coating process and coating, can solve instability and other problems, achieve the goal of improving service life, reducing production cost, saving roll changing time and maintenance time Effect

Inactive Publication Date: 2017-01-18
WUHAN DIANJIN LASER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are also attempts to spray oxide ceramics on the surface of the hearth roller, such as the zirconia-yttria system and the alumina-chromia system. These ceramic coatings have a strong anti-nodulation effect at high temperatures, but at high temperatures Instable, even chemical reaction with the elements precipitated on the surface of the steel plate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A laser cladding treatment process for the ring surface of a hearth roll of a heating furnace, comprising the following process steps:

[0023] (1) At room temperature, use cleaning agent to degrease and derust the ring surface of the bottom roller of the heating furnace, and clean it with alcohol;

[0024] (2) The Co-based alloy powder is conveyed by the side-axis powder feeding method, the broadband scanning method (D=10mm), the carbon dioxide laser with laser power P=3800W, and scanning speed V=600mm / min is used for fast scanning. Clean well in step (1) The roller ring surface of the heating furnace bottom roller is realized to clad the roller ring surface;

[0025] (3) Perform crack detection on the cladding layer prepared in step (2) and judge that there are false cracks.

Embodiment 2

[0027] A laser cladding treatment process for the ring surface of a hearth roll of a heating furnace, comprising the following process steps:

[0028] (1) Use a cleaning agent to degrease and derust the ring surface of the bottom roller of the heating furnace at room temperature, and clean it with alcohol;

[0029] (2) Convey Co-based alloy powder by coaxial powder feeding method, narrow-band scanning method (D=3mm), select laser power P=3000W, and scan speed V=300mm / min carbon dioxide laser fast scanning step (1) Clean well The roller ring surface of the heating furnace bottom roller is realized to clad the roller ring surface;

[0030] (3) Perform crack detection on the cladding layer prepared in step (2) and judge that there are false cracks.

Embodiment 3

[0032] A laser cladding treatment process for the ring surface of a hearth roll of a heating furnace, comprising the following process steps:

[0033] (1) Use a cleaning agent to degrease and derust the ring surface of the bottom roller of the heating furnace at room temperature, and clean it with alcohol;

[0034] (2) Co-based alloy powder is conveyed by side-axis powder feeding method, narrow-band scanning method (D=3mm), laser power P=2000W, scanning speed V=000mm / min carbon dioxide laser fast scanning step (1) is cleaned well The roller ring surface of the furnace bottom roller is alloyed to realize the alloying treatment;

[0035] (3) Perform crack detection on the alloyed layer prepared in step (2) and judge that there are false cracks.

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PUM

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Abstract

The invention relates to a laser cladding treatment process for a heating furnace hearth roll collar surface. The process comprises the steps of: cleaning a heating furnace hearth roll collar surface; conveying Co based alloy powder by a coaxial or paraxial powder feeding mode, selecting a carbon dioxide laser to rapidly scan the cleaned roll collar surface by means of narrowband or broadband scanning so as to realize alloying treatment of the heating furnace hearth roll collar surface, thus obtaining an alloying layer; and conducting crack and flaw detection and judging whether crack is produced. The process provided by the invention reinforces the hearth roll collar surface, improves the service life of the roll collar, basically solves the problem of nodulation on the roll collar surface, saves the roll changing time and maintenance time, improves the heating furnace work efficiency, and reduces the production cost.

Description

technical field [0001] The invention relates to the field of surface strengthening technology of a bottom roller ring of a heating furnace, in particular to a laser cladding treatment process for the ring surface of a bottom roller of a heating furnace. Background technique [0002] The hearth roller is a key component in the conveying process of various heat treatment parts in the metallurgical industry. It is widely used in various heat treatment furnaces, including continuous annealing furnaces, heating furnaces, heat treatment normalization furnaces, etc. The hearth roller of the heating furnace plays the role of conveying the billet, and in order to ensure that the billet does not have quality problems in the subsequent rolling process, it is very important to prevent the formation of nodules on the surface of the steel rod when the steel rod is in contact with the steel plate at high temperature. Heating furnace hearth roll rings are now commonly made of Co50 alloy, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
Inventor 陶兴启黄旭东董容刚
Owner WUHAN DIANJIN LASER TECH
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