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A hot roller laser restoration method allowing surface hardness after restoration to be 58 HRC or above

A laser repairing and hot rolling technology, applied in the field of laser cladding, can solve the problems of poor surfacing, easy cracks, insufficient hardness, etc., and achieve high fusion rate, optimized overlap, and uniform thickness and hardness.

Inactive Publication Date: 2017-04-19
DANYANG HONGTU LASER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the reason of the material, the surfacing of hot rolls is very poor. Using ordinary surfacing methods will easily cause defects such as cracks, pores, and insufficient hardness, which makes the repair of rolls of this type of material difficult.

Method used

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  • A hot roller laser restoration method allowing surface hardness after restoration to be 58 HRC or above
  • A hot roller laser restoration method allowing surface hardness after restoration to be 58 HRC or above
  • A hot roller laser restoration method allowing surface hardness after restoration to be 58 HRC or above

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The specific steps of the laser repair method of the hot roll of the present embodiment are as follows:

[0024] A. Pretreat the surface of the hot roll to be repaired, and test and analyze the hot roll.

[0025] Remove the dust, oil and rust on the hot roll; detect the size of each part of the hot roll, determine the failure part and its wear amount; check the radial and end runout of the hot roll to check whether the roll is deformed; remove the roll by grinding The fatigue layer of the failure part shall be 0.5mm, and shall be cleaned.

[0026] B. According to the failure analysis results of the hot roll, optimize the process parameters and perform multi-layer laser cladding.

[0027] Using the preset powder feeding method, the fast cross-flow carbon dioxide laser is used as the light source to perform continuous spiral feed lap scanning on the hot roll; the laser power is 2150W, and the elevation (that is, the distance between the laser and the object, elevation = ...

Embodiment 2

[0036] The specific steps of the laser repair method of the hot roll of the present embodiment are as follows:

[0037] A. Pretreat the surface of the hot roll to be repaired, and test and analyze the hot roll.

[0038]Remove the dust, oil and rust on the hot roll; detect the size of each part of the hot roll, determine the failure part and its wear amount; check the radial and end runout of the hot roll to check whether the roll is deformed; remove the roll by grinding The fatigue layer of the failure part shall be 0.5mm, and shall be cleaned.

[0039] B. According to the failure analysis results of the hot roll, optimize the process parameters and perform multi-layer laser cladding.

[0040] Using the preset powder feeding method, the fast cross-flow carbon dioxide laser is used as the light source to carry out continuous spiral feed lap scanning on the hot roll; the laser power is 2160W, the elevation is 235mm, the spot size is 12mm×1.8mm, and the scanning speed is 150mm / m...

Embodiment 3

[0049] The specific steps of the laser repair method of the hot roll of the present embodiment are as follows:

[0050] A. Pretreat the surface of the hot roll to be repaired, and test and analyze the hot roll.

[0051] Remove the dust, oil and rust on the hot roll; detect the size of each part of the hot roll, determine the failure part and its wear amount; check the radial and end runout of the hot roll to check whether the roll is deformed; remove the roll by grinding The fatigue layer of the failure part shall be 0.5mm, and shall be cleaned.

[0052] B. According to the failure analysis results of the hot roll, optimize the process parameters and perform multi-layer laser cladding.

[0053] Using the pre-set powder feeding method, the fast cross-flow carbon dioxide laser is used as the light source to perform continuous spiral feed lap scanning on the hot roll; the laser power is 2200W, the elevation is 240mm, the spot size is 12mm×1.8mm, and the scanning speed is 140mm / m...

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Abstract

The invention relates to a hot roller laser restoration method allowing surface hardness after restoration to be 58 HRC or above. A transition alloy layer, a middle alloy layer and a surface alloy layer are cladded with laser layer by layer from the inside on the surface of a hot roller. Alloy powder adopted by the transition alloy layer includes components by mass: 0.12-0.19% of C, 3.2-3.6% of Si, 1.2-1.8% of B, 2.2-2.6% of Fe, and 7-8% of Cr, with the balance being Ni. Alloy powder adopted by the middle alloy layer includes components by mass: 0.4-0.5% of C, 3.8-4.3% of Si, 12-13% of B, 2.0-2.45% of Fe, and 10-12% of Cr, with the balance being Ni. Alloy powder adopted by the surface alloy layer includes components by mass: 0.05-0.1% of C, 3.0-3.6% of Si, 2-4% of Fe, 16-19% of Cr and 27-30% of Mo, with the balance being Co. The surface of the hot roller restored by the method has good wear resistance, corrosion resistance and hot hardness, both toughness and strength of the inside of the hot roller are taken into account, and laser cladding effects are good.

Description

technical field [0001] The invention relates to a laser cladding method, in particular to a laser cladding method using a broadband laser beam for a hot roll. Background technique [0002] Rolls are the largest consumables in my country's metallurgical industry, and hot rolls are one of the main consumable spare parts in steel rolling production, and their consumption is far greater than that of cold rolls. The consumption of hot rolls is about 5% to 15% of the production cost of steel rolling. The quality of hot rolls is not only related to the cost of rolling steel production and the production rate of rolling mills, but also affects the quality of rolled products to a large extent. With the development of steel rolling technology, the speed and automation of rolling mills have been continuously improved, which puts forward higher requirements for the quality of hot rolls, especially the wear resistance, strength and toughness of hot rolls. [0003] The obvious trend in ...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C19/05C22C19/07C22C30/00
CPCC23C24/106C22C19/058C22C19/07C22C30/00
Inventor 何建方刘少彬马万花
Owner DANYANG HONGTU LASER TECH
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