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Laser repairing method of damaged roller

A technology of laser repairing and rolling, applied in laser welding equipment, coating, metal material coating process, etc., can solve the problem of low bonding strength, and achieve the effect of reducing cost, enhancing bonding strength and improving production efficiency

Active Publication Date: 2019-05-03
江苏镭电嘉成激光科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low bonding strength between the repair layer and the roll substrate in the prior art, the purpose of the present invention is to provide a laser repair method for damaged rolls. In addition, the present invention is also applied to improve the durability of common cast iron rolls. Remanufacturing of abrasiveness and hardness

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  • Laser repairing method of damaged roller
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  • Laser repairing method of damaged roller

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Such as figure 1 Shown is the roll to be repaired or to be remanufactured, and the specific process steps of the laser repair method for the roll to be repaired or to be remanufactured are as follows:

[0032] (1) Roll surface pretreatment: remove the wear and failure layer on the surface of roll 1, and then turn and grind to achieve the same shape as the finished roll body;

[0033] (2) Measure the size of the roll after pretreatment: roll 1 perimeter and width;

[0034] (3) choose a piece of 80CrN13W steel plate 2, its length and width are equal to the width and the circumference of roll 1 respectively, and the thickness of steel plate 2 is 2mm (such as figure 2 shown);

[0035] (4) Under the protection environment of transporting inert gas, use laser cladding to clad a layer of high hardness and wear-resistant mixed material with a thickness of 0.2 mm on the surface of the above-mentioned 80CrN13W steel plate 2 to form an alloy powder layer 3. The wear-resistant m...

Embodiment 2

[0040] The specific process steps of the laser repair method for the roll to be repaired or to be remanufactured are as follows:

[0041] (1) Roll surface pretreatment: remove the wear and failure layer on the surface of roll 1, and then turn and grind to achieve the same shape as the finished roll body;

[0042] (2) Measure the size of the roll after pretreatment: roll 1 perimeter and width;

[0043] (3) choose a piece of high chromium cast steel plate 2, its length and width are equal to the width and the circumference of roll 1 respectively, and the thickness of steel plate 2 is 4mm;

[0044] (4) Under the protection environment of transporting inert gas, use laser cladding to clad a layer of high hardness and wear-resistant mixed material with a thickness of 0.4 mm on the surface of the above-mentioned high-chromium cast steel plate 2 to form an alloy powder layer 3. The wear-resistant mixed material It is a 5:5 mixed powder of nickel-based alloy and tungsten carbide, whe...

Embodiment 3

[0049] The specific process steps of the laser repair method for the roll to be repaired or to be remanufactured are as follows:

[0050] (1) Roll surface pretreatment: remove the wear and failure layer on the surface of roll 1, and then turn and grind to achieve the same shape as the finished roll body;

[0051] (2) Measure the size of the roll after pretreatment: roll 1 perimeter and width;

[0052] (3) choose a piece of 8CrMoV steel plate 2, its length and width are equal to the width and the circumference of roll 1 respectively, and the thickness of steel plate 2 is 3mm;

[0053] (4) Under the protection environment of transporting inert gas, use laser cladding to clad a layer of high-hardness wear-resistant mixed material with a thickness of 0.1 mm on the surface of the above-mentioned high-chromium cast steel plate 2 to form an alloy powder layer 3. The wear-resistant mixed material It is a 5:5 mixed powder of nickel-based alloy and tungsten carbide, wherein the nickel-...

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Abstract

The invention belongs to the technical field of roller repairing, particularly relates to the technical field of laser welding repairing, in particular to a laser repairing method of a damaged roller.The laser repairing method includes the following steps: a wear failure layer on the surface of the roller is removed first, and then the roller is turned and ground to achieve the consistency with afinished roller body; then a chrome-contained steel plate is selected, a layer of high-hardness wear-resistant material is coated on the surface of the chrome-contained steel plate, the chrome-contained steel plate is heated, then rolled on the roller in the form of an insert bush to form a C ring, and a joint of the C ring is welded through a laser; and finally, a layer of self-melting alloy powder is coated on the surface of the insert bush through the laser. According to the laser repairing method of the damaged roller, the problems that the bonding strength between a repairing layer and aroller base body is low, cladding materials are difficult to accumulate on a roller carrying a cylinder, and since the volume of the roller is large and heat dissipation is fast, cracks are producedby the pressure caused by rapid cooling when laser spots leave are solved, and the Rockwell hardness of the repaired roller can be improved to be 65 HRC or above.

Description

technical field [0001] The invention belongs to the technical field of roll repair, in particular to the technical field of laser welding repair, in particular to a laser repair method for damaged rolls. Background technique [0002] The roll is a tool for plastically deforming the rolled metal, and is an important consumable part that determines the efficiency of the rolling mill and the quality of the rolled material. The roll is an important part of the rolling mill, which uses the pressure generated by a pair or a group of rolls to roll and roll the steel. It is mainly subjected to dynamic and static loads, wear and temperature changes during rolling. 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, peeling and even scrapping on the surface of the roll. Therefore, the surface of the cold roll is require...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10B23K26/262B23K26/60
Inventor 彭志学彭志刚
Owner 江苏镭电嘉成激光科技有限公司
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