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A method for preparing gradient coatings by laser cladding to repair cold rolls

A technology of laser cladding and gradient coating, which is applied in the direction of coating, metal material coating process, etc., can solve the problems of shedding, low bonding strength, high carbon content, etc., to meet the needs of repair, high comprehensive mechanical properties, tissue dense effect

Active Publication Date: 2017-02-22
九江中科神光科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the surface material of the cold roll has a high carbon content, which makes the base material and the cladding layer produce a brittle phase, the bonding strength is low, and it is easy to fall off

Method used

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  • A method for preparing gradient coatings by laser cladding to repair cold rolls
  • A method for preparing gradient coatings by laser cladding to repair cold rolls
  • A method for preparing gradient coatings by laser cladding to repair cold rolls

Examples

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Effect test

Embodiment example 1

[0031] Implementation Case 1: Surface Repair of Steel Strip Cold Roll

[0032] The material of the roll is Cr12MoV alloy, which has fine grains, good hardenability, high hardness, strength and toughness after quenching and tempering, and small quenching deformation. It is widely used in the manufacture of cold rolls. The effect of repairing with traditional surfacing welding is poor, and the service life is less than 10 hours.

[0033] The technology of the present invention is implemented in this field, and the roll is repaired by laser cladding, and the implementation process is as follows:

[0034] (1) Grinding the area to be repaired of the steel strip cold roll, and then sandblasting to further roughen and purify the surface of the substrate;

[0035] (2) Prepare the first layer of solder powder, using pure gold powder, manganese powder, nickel powder, zinc powder, chromium powder, mixed according to mass ratio 55.0:12.0:8.0:24.0:1.0, mixed by ball mill for 50 minutes, a...

Embodiment 2

[0042] Embodiment 2: Preparation of cladding layer on the surface of wire roll

[0043] The material of the roll is H13 alloy. This steel has high hardenability and thermal cracking resistance, good wear resistance, relatively weakened toughness, good heat resistance, and excellent comprehensive mechanical properties at higher temperatures. performance and high stability against tempering. It can be used in the manufacture of cold rolls, and the service life after surfacing welding is only 3 to 5 hours. Utilize the technology of the present invention to carry out laser cladding repair to this roll, the implementation process is as follows:

[0044] (1) Grinding the area of ​​the wire roll to be repaired, and then sandblasting to further roughen and purify the surface of the substrate;

[0045] (2) Prepare the first layer of solder powder, using pure gold powder, manganese powder, nickel powder, zinc powder, chromium powder, mixed according to mass ratio 55.0:12.0:8.0:24.0:1....

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Abstract

The invention relates to a method for restoring a cold roll through preparing a gradient coating via laser cladding. The method comprises the following steps: 1) carrying out polishing, cleaning and sand blasting on the to-be-restored area of the cold roll; 2) paving a brazing flux on the surface of the to-be-restored area of the cold roll, paving brazing filler metal powder on the brazing flux and preparing a first transition layer through a high-temperature heating manner; 3) pacing transition material powder on the surface of the first transition layer and preparing a second transition layer through laser cladding; 4) paving alloy powder on the surface of the second transition layer and preparing a third gradient layer through laser cladding. The method starts with the structural design of a cladding layer, and the cladding layer is designed into an alloy gradient layer with a multilayer structure, so that the problem that the cold roll is easy to crack, relatively low in bonding strength and easy to fall off after the restoration is solved.

Description

technical field [0001] The invention relates to the technical field of repairing cold rolls, in particular to a method for repairing cold rolls by using laser cladding to prepare gradient coatings. Background technique [0002] The cold roll is the key component and consumable part of the cold rolling mill. During the rolling process, the working stress is extremely high. At the same time, it is affected by problems such as inclusions and edge cracks of the rolled piece, which may easily cause scratches, cracks, sticking, etc. on the surface of the roll. Spalling or even scrapping, so the surface of the cold roll is required to have a relatively high hardness, toughness and crack resistance. Cold rolls are usually forged from alloy steel and manufactured through a complex heat treatment process, which is very expensive to produce. According to relevant statistics, the loss rate of cold rolls in large iron and steel enterprises in my country is about 0.8-1.1 kg / ton, and it i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C5/02C22C19/05C22C38/58C22C38/54B22F1/00
CPCC23C24/103
Inventor 高雪松肖猛张涛刘建涛
Owner 九江中科神光科技有限公司
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