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Repairing method of cracks on roll surface of back-up roll of rolling mill

A repair method and technology for supporting rollers, which are applied in coating and metal material coating processes, etc., can solve the problems of secondary cracking and poor repair effect, achieve small grinding amount, increase cladding quality, and improve high energy distribution. The effect of inhomogeneity

Active Publication Date: 2014-07-02
HANGZHOU DAYE LASER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention proposes a method for repairing cracks on the roll surface of rolling mill back-up rolls, which solves the problems of poor repair effect and easy secondary cracking in the prior art

Method used

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  • Repairing method of cracks on roll surface of back-up roll of rolling mill

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for repairing cracks on the surface of the backing roll of a rolling mill figure 1 Shown), including:

[0037] (A) Crack pretreatment

[0038] Remove the crack defect area on the roller surface;

[0039] Use magnetic particle inspection, X-ray inspection, fluorescent inspection or display inspection method to detect the crack defect. Confirm whether there is hydrogen embrittlement, cracking or internal cracking tendency.

[0040] (B) Repair

[0041] Use nickel-based alloy powder to cladding the area to be repaired through a laser. Equipment: 3000W high-power all-solid-state laser. When cladding, pay attention to metallurgical defects such as uniform, continuous, no cracks and pores in the cladding layer.

[0042] Carry out vibration aging treatment, equipment: automatic vibration aging device. The vibrator causes resonance and uses 200Hz low-frequency vibration to excite molecular activities, displace the grain boundaries in the metal, and release the stress in the cl...

Embodiment 2

[0052] A method for repairing cracks on the roller surface of a supporting roll of a rolling mill, comprising:

[0053] (A) Crack pretreatment

[0054] Remove the crack defect area on the roller surface;

[0055] Use magnetic particle inspection, X-ray inspection, fluorescent inspection or display inspection method to detect the crack defect. Confirm whether there is hydrogen embrittlement, cracking or internal cracking tendency.

[0056] (B) Repair

[0057] Use nickel-based alloy powder to cladding the area to be repaired through a laser. Equipment: 3000W high-power all-solid-state laser. When cladding, pay attention to metallurgical defects such as uniform, continuous, no cracks and pores in the cladding layer.

[0058] Carry out vibration aging treatment, equipment: automatic vibration aging device. The vibrator causes resonance and uses 200Hz low-frequency vibration to excite molecular activities, displace the grain boundaries in the metal, and release the stress in the cladding l...

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Abstract

The invention provides a repairing method of cracks on a roll surface of a back-up roll of a rolling mill. The repairing method comprises the following steps: (a) pre-treatment of cracks; (b) repairing, namely carrying out fusion covering on a to-be-repaired part through a laser by means of nickel base alloy powder; carrying out a vibration aging treatment, wherein the nickel base alloy powder comprises the following chemical components in percentage by mass: 0.5% of C, 18-20% of Cr, 2-3% of Mo, 0.5-1% of Mn, 2-3% of Si, 3.5-4.5% of Fe, 1.5-3% of W, 1.5-2% of Co, 2-3% of CeO and the balance of Ni; and carrying out fusion covering on rectangular spots in a laminated manner; and (c) post-treatment. The repairing method provided by the invention is used for repairing the cracks on the roll surface by adopting the laser cladding technology without pre-heating. Furthermore, subsequent grinding amount is small without metallurgical cracks, and the hardness can reach the operating requirement of a new roll [HRC (Rockwell Hardness) is over 60].

Description

Technical field [0001] The invention relates to the technical field of surface repairing of mechanical equipment, in particular to a method for repairing cracks on the surface of a supporting roll of a rolling mill. Background technique [0002] Laser cladding technology is an interdisciplinary high-tech involving multiple disciplines such as optics, mechanics, electricity, computers, materials, physics and chemistry. It was proposed in the 1960s and the first patent on high-energy laser cladding was born in 1976. In the 1980s, laser cladding technology has developed rapidly, combined with the rapid prototyping technology that has emerged from CAD technology, has added new vitality to laser cladding technology. [0003] The main problems facing the further application of laser cladding technology are: ① The main reason why laser cladding technology has not been fully industrialized in China is the instability of the quality of the cladding layer. During the laser cladding process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C23C24/10C22C19/05C21D10/00
Inventor 谢长国
Owner HANGZHOU DAYE LASER TECH
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