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Method for preparing wear-resistant heat-resistant coating through laser cladding of surface of guide roller by bar rolling mill

A technology of laser cladding and bar rolling mill, applied in metal material coating process, coating, etc., can solve the problems of high manufacturing cost, poor anti-accident ability, effective use of large area, harsh service conditions, etc. The effect of controlling and improving the ability of wear resistance and thermal fatigue resistance

Inactive Publication Date: 2014-12-31
SHENYANG DALU LASER COMPLETE EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional manufacturing methods of guide rollers include high-alloy integral casting, surface vacuum welding, carburizing (nitrogen), etc., but it is difficult to meet the performance requirements of guide rollers
The solid carbide guide roller has a long service life, but its manufacturing cost is high, the use conditions are harsh, and the anti-accident ability is not good enough to be used effectively in a large area

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The process of preparing wear-resistant and heat-resistant coating by laser cladding on the surface of guide roll of bar rolling mill includes the following process.

[0036] (1) Pretreatment of the surface of the guide roller.

[0037] The surface of the guide is degreased and derusted at room temperature, and it is inspected by the coloring flaw detection method. It is required that the surface has no defects such as cracks, pores, and inclusions.

[0038] (2) Preparation of cemented carbide composite powder.

[0039] A Chemical composition of iron-based alloy powder.

[0040] The chemical composition of iron-based alloy powder mainly contains Fe, C, Cr, Ni, Mo, Si, N, Nb, Ta, B; its chemical composition is: C: 0.08%, Cr: 16%, Ni: 3 %, Mo: 1%, Si: 1%, N: 0.8%, Nb: 0.8%, Ta: 0.3%, B: 0.3%, and the balance is Fe.

[0041] B alloy chemical powder composition.

[0042] Standard titanium carbide powder, carbide content ≥ 98%, particle size 30-70 microns.

[0043] C c...

Embodiment 2

[0059] The process of preparing wear-resistant and heat-resistant coating by laser cladding on the surface of guide roll of bar rolling mill includes the following process.

[0060] (1) Pretreatment of the surface of the guide roller.

[0061] Carry out degreasing and derusting treatment on the surface of the guide at room temperature. And it is inspected by coloring flaw detection method, and the surface is required to be free of cracks, pores, inclusions and other defects.

[0062] (2) Preparation of cemented carbide composite powder.

[0063] A Chemical composition of iron-based alloy powder.

[0064] The chemical composition of iron-based alloy powder mainly contains Fe, C, Cr, Ni, Mo, Si, N, Nb, Ta, B; its chemical composition is: C: 0.08%, Cr: 16%, Ni: 3%, Mo: 1%, Si: 1%, N: 0.8%, Nb: 0.8%, Ta: 0.3%, B: 0.3%, and the balance is Fe.

[0065] B alloy chemical powder composition.

[0066] Standard titanium carbide powder, carbide content ≥ 98%, particle size 30-70 mic...

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Abstract

The invention relates to a method for preparing a wear-resistant heat-resistant coating through laser cladding of surface of a guide roller by a bar rolling mill, which comprises the following steps: removing oil and rust on the surface of the guide roller under room temperature; preparing alloy powder B with weight percentage of 15-50% in an A+B hard alloy composite powder; adjusting an automatic powder feeding apparatus so that the alloy powder from an automatic powder feeding head just falls in a laser molten pool, adjusting the powder feeding amount so that the coating thickness of the alloy powder can reach 0.8-2mm; selecting a 3.5*1mm broadband integration mirror, and adjusting the defocus amount for laser cladding, and forming an uniform and compact laser cladding layer on the surface of the guide roller. The hard alloy composite powder has good metallurgy and mechanical compatibility with a guide roller matrix, cladding layer thickness is 0.8-2.0mm, the hardness and thickness are uniform, and no crack and spalling phenomena can be generated.

Description

technical field [0001] The invention relates to a method for repairing metallurgical equipment components using laser cladding technology, in particular to a method for preparing a wear-resistant and heat-resistant coating by laser cladding on the surface of a guide roller of a bar rolling mill, belonging to the technical field of laser cladding. technical background [0002] The entrance and exit of finish rolling in bar and wire rolling mills mostly adopt rolling guide devices. Due to the harsh working conditions, the guide rollers become the main wearing parts. In addition, because modern high-speed rolling mills have high requirements on the precision of guide rollers, the consumption of guide rollers is huge. [0003] During the rolling process, the guide rollers have to withstand high temperature, the rolling and sliding friction of the high-speed operation of rods and wires, and the abrasive wear of oxides; at the same time, there is the impact caused by sticking stee...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C38/54B22F1/00
Inventor 赵越陈海涛张威
Owner SHENYANG DALU LASER COMPLETE EQUIP
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