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

A repair method and technology of supporting rollers, which are applied in the field of mechanical equipment surface repair, can solve the problems of secondary cracking and poor repair effect, and achieve the effects of small amount of grinding, increased cladding quality, and improved uneven distribution of high energy

Active Publication Date: 2017-04-19
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 for cracks on roll surface of rolling mill back-up rolls

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of repair method of rolling mill back-up roll roll surface crack (referring to figure 1 shown), including:

[0035] (a) Crack pretreatment

[0036] Clear the crack defect area on the roll surface;

[0037] Use magnetic particle flaw detection, X-ray flaw detection, fluorescent flaw detection or display flaw detection method to detect the crack defect. Confirm whether there is a tendency of hydrogen embrittlement, cracking or internal cracking.

[0038] (b) Repair

[0039] Use nickel-based alloy powder to clad the parts to be repaired by laser, equipment: 3000W high-power all-solid-state laser. When cladding, pay attention to the cladding layer is uniform, continuous, free of metallurgical defects such as cracks and pores.

[0040] Vibration aging treatment, equipment: automatic vibration aging device. The exciter causes resonance, and uses low-frequency vibration of 200Hz to excite molecular activities, displace the grain boundaries in the metal, and releas...

Embodiment 2

[0050] A method for repairing cracks on the roll surface of a back-up roll of a rolling mill, comprising:

[0051] (a) Crack pretreatment

[0052] Clear the crack defect area on the roll surface;

[0053] Use magnetic particle flaw detection, X-ray flaw detection, fluorescent flaw detection or display flaw detection method to detect the crack defect. Confirm whether there is a tendency of hydrogen embrittlement, cracking or internal cracking.

[0054] (b) Repair

[0055] Use nickel-based alloy powder to clad the parts to be repaired by laser, equipment: 3000W high-power all-solid-state laser. When cladding, pay attention to the cladding layer is uniform, continuous, free of metallurgical defects such as cracks and pores.

[0056] Vibration aging treatment, equipment: automatic vibration aging device. The exciter causes resonance, and uses low-frequency vibration of 200Hz to excite molecular activities, displace the grain boundaries in the metal, and release the stress ins...

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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 repair of mechanical equipment, in particular to a method for repairing cracks on the roll surface of a backup roll of a rolling mill. Background technique [0002] Laser cladding technology is an interdisciplinary high-tech involving many 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, and the rapid prototyping technology combined with the rise of CAD technology has added new vitality to laser cladding technology. [0003] The main problems faced by the further application of laser cladding technology are: ① The main reason why laser cladding technology has not yet fully realized industrialization in China is the instability of cladding layer quality. During the laser cladding process, ...

Claims

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Application Information

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