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Laser surface cladding method of straightening roller

A technology of straightening rollers and lasers, which is applied in the coating process and coating of metal materials, can solve problems such as holes and looseness in the surfacing coating, complicated preparation process, and reduced wear resistance of the coating, so as to achieve anti-corrosion Good nodulation performance of iron oxide scale, broad application prospects, and the effect of improving wear resistance

Active Publication Date: 2012-03-28
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The surfacing technology can better solve the wear resistance of the straightening roller, but the surfacing technology often needs to adopt the treatment process of preheating before surfacing, tempering after surfacing, and preparing a transition layer when necessary. The process is complex; and the surfacing coating is prone to defects such as holes and looseness, which reduces the wear resistance of the coating

Method used

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  • Laser surface cladding method of straightening roller
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  • Laser surface cladding method of straightening roller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Degrease the straightening roller with acetone, and perform sandblasting and purification treatment, with a roughness of Ra3~5μm;

[0019] (2) According to the weight ratio of 70%: 20%: 10%, the iron-based alloy powder with a particle size of 53-150 μm, the spherical cast tungsten carbide powder of 80-120 μm, and the cast chromium carbide powder of 100-150 μm are uniformly mixed;

[0020] (3) Adjust CO 2 The laser power is 4000W, the laser beam width is 5mm, the laser cladding speed is 300mm / min, and the laser overlap rate is 40%. The above-mentioned powder is laser cladding by the synchronous powder feeding method, and the thickness of the cladding layer is about 0.5mm;

[0021] (4) Slowly cooling the straightening roller obtained in step (3) to room temperature, grinding and polishing the cladding layer to obtain a cermet composite coating containing spherical cast tungsten carbide and cast chromium carbide.

Embodiment 2

[0023] (1) Degrease the straightening roller with acetone, and perform sandblasting and purification treatment, with a roughness of Ra3~5μm;

[0024] (2) According to the weight ratio of 80%: 12%: 8%, the iron-based alloy powder with a particle size of 53-150 μm, the spherical cast tungsten carbide powder of 80-120 μm, and the cast chromium carbide powder of 100-150 μm are uniformly mixed;

[0025] (3) Adjust CO 2 The laser power is 6000W, the laser beam width is 7.5mm, the laser cladding speed is 800mm / min, and the laser overlap rate is 50%. The above-mentioned powder is laser cladding by the synchronous powder feeding method, and the thickness of the cladding layer is about 1mm;

[0026] (4) Slowly cooling the straightening roller obtained in step (3) to room temperature, grinding and polishing the cladding layer to obtain a cermet composite coating containing spherical cast tungsten carbide and cast chromium carbide.

Embodiment 3

[0028] (1) Degrease the straightening roller with acetone, and perform sandblasting and purification treatment, with a roughness of Ra3~5μm;

[0029] (2) According to the weight ratio of 90%: 5%: 5%, the iron-based alloy powder with a particle size of 53-150 μm, the spherical cast tungsten carbide powder of 80-120 μm, and the cast chromium carbide powder of 100-150 μm are uniformly mixed;

[0030] (3) Adjust CO 2 The laser power is 8000W, the laser beam width is 10mm, the laser cladding speed is 1500mm / min, and the laser overlap rate is 70%. The above-mentioned powder is laser cladding by the synchronous powder feeding method, and the thickness of the cladding layer is about 2mm;

[0031] (4) Slowly cooling the straightening roller obtained in step (3) to room temperature, grinding and polishing the cladding layer to obtain a cermet composite coating containing spherical cast tungsten carbide and cast chromium carbide.

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Abstract

A laser surface cladding method of a straightening roller. The invention is characterized in that the method comprises the following steps: performing oil removal and sand blasting of a straightening roller surface; uniformly mixing iron-based alloy powder, spherical casting tungsten carbide powder and casting chromium carbide powder according to weight ratios; adjusting the CO2 laser power, the laser beam width, the laser cladding speed, and the laser overlapping rate, performing laser cladding of the powder by a synchronous powder feeding method to obtain a cermet composite coating containing spherical casting tungsten carbide and casting chromium carbide particles. In the cermet composite coating prepared by the method of the invention, spherical casting tungsten carbide and casting chromium carbide are uniformly distributed at the lower-middle part and upper-middle part of the coating, and are tightly combined with the coating without defects such as cracks, holes and the like; the coating has high hardness, good wear resistance and nodulation resistance, and is applicable to surface strengthening, repair and reutilization of straightening rollers.

Description

technical field [0001] The invention belongs to the technical field of strengthening and repairing straightening rollers on a medium-thick plate production line in the iron and steel industry, and in particular relates to a laser surface cladding method for straightening rollers. Background technique [0002] The straightening roll is the key component of the straightening machine, which is the core equipment of the continuous rolling finishing line. Wave (unilateral or bilateral), camber, twist and other plate defects and internal residual stress, improve the flatness, precision and surface quality of the steel plate. Due to service under high-load straightening force, cold and heat fatigue and other working conditions, the surface of the straightening rollers has serious wear, corrosion, nodules and other phenomena, which first caused a huge consumption of the straightening rollers, and secondly replaced the straightening rollers frequently Cause the stoppage of productio...

Claims

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Application Information

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IPC IPC(8): C23C24/10
Inventor 马文有刘敏代明江黄健李福海佟鑫陈兴驰
Owner GUANGDONG INST OF NEW MATERIALS
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