Laser-cladding repairing process for centering roller

A technology of laser cladding and centering rolls, applied in the field of laser cladding, can solve the problems of limited grinding precision, inability to complete the replacement of the middle rolls, serious problems, etc., to improve the cladding efficiency, the thickness of the cladding layer is consistent, and the production cost low effect

Inactive Publication Date: 2016-02-03
宋禹辰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of the overall structure of the centering roller table, it takes 14 hours to replace a centering roller, while the regular maintenance usually only takes 10 hours, and the replacement of the centering roller cannot be completed within the scheduled repair time
[0004] At present, the damaged part can only be partially repaired by on-line electric welding surfacing and then grinding. Since the electric welding material has no good wear resistance and the precision of grinding is limited, the centering roller will wear again after 15 days of operation. and getting worse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] [Example 1] Restoration of centering rollers in large-scale Anshan Iron and Steel Plant

[0039] The basic situation of the centering roller:

[0040] Specification: Φ310×100mm; Weight: 500kg / piece; Material: 35# cast steel.

[0041] Working conditions: Conveying billets and rolled rails, the temperature of the billet is 1050°C, the roller table is 150-200°C under normal conditions, the contact surface temperature can reach 500-600°C, and the roller body is naturally cooled.

[0042] The repair process is as follows;

[0043] Use a lathe to flatten the centering roller, and remove 2mm of the fatigue layer; use PT flaw detection, and use manual grinding to remove defects; use acetone to wipe off oil and impurities on the surface.

[0044] Clamp the surface-treated centering roller on the laser processing machine tool, and use the top of the machine tool to align the two ends;

[0045] Cladding process parameters:

[0046] Laser power: 3800~4200W, spot size: 10×2mm, o...

Embodiment 2

[0051] [Example 2] Restoration of centering rollers in large-scale Baotou Iron and Steel Plant

[0052] The basic situation of the centering roller:

[0053] Specification: Φ290×100mm; Weight: 500kg / piece; Material: 35# cast steel.

[0054] Working conditions: Conveying billets and rolled rails, the temperature of the billet is 1030°C, the roller table is 150-200°C under normal conditions, the contact surface temperature can reach 500-600°C, and the roller body is naturally cooled.

[0055] The repair process is as follows;

[0056] Use a lathe to flatten the centering roller, and remove 1mm of the fatigue layer; use PT flaw detection, and use manual grinding to remove defects; use acetone to wipe off oil and impurities on the surface.

[0057] Clamp the surface-treated centering roller on the laser processing machine tool, and use the top of the machine tool to align the two ends;

[0058] Cladding process parameters: laser power: 3800W ~ 4200W, spot diameter: 10×2mm, over...

Embodiment 3

[0063] [Example 3] Repairing of centering rollers in medium-sized Baosteel plant

[0064] The basic situation of the centering roller:

[0065] Specification: Φ260×100mm; Weight: 420kg / piece; Material: 35# cast steel.

[0066] Working conditions: Conveying billets and rolled rails, the billet temperature is 1060°C, the roller table is 150-200°C under normal conditions, the contact surface temperature can reach 500-600°C, and the roller body is naturally cooled.

[0067] The repair process is as follows;

[0068] Use a lathe to flatten the centering roller, and remove 1.5mm of the fatigue layer; use PT flaw detection, and use manual grinding to remove defects; use acetone to wipe off oily impurities on the surface.

[0069] Clamp the surface-treated centering roller on the laser processing machine tool, and use the top of the machine tool to align the two ends;

[0070] Cladding process parameters: laser power: 3800~4200W, spot diameter: 10×2mm, overlap: 2.5mm, coaxial powde...

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Abstract

The invention relates to a laser-cladding repairing process for a centering roller. The abraded surface of the centering roller is repaired through modified laser cladding, meanwhile, the corrosion and abrasion resistance performance of the centering roller is improved, and the service life and the replacement cycle of the centering roller are effectively prolonged. The process comprises the following steps of (1) surface treatment on the centering roller needing repairing, (2) clamping and aligning, (3) laser-cladding repairing and (4) detection, flaw detection and machining. Compared with the prior art, the laser-cladding repairing process has the beneficial effects that (1) compared with a traditional cladding mode, a cladding layer formed by modified cladding is basically uniform in thickness, the cladding efficiency is improved by 10-20 times, and the production cost is low; (2) the bonding strength of a base body and the laser cladding layer is not lower than 90% of that of an original base material, and the cladding layer and an interface of the cladding layer are compact in structure, fine in grain and free of the defects of holes, slag inclusion, cracks and the like; (3) the surface hardness of a repaired layer is HV450-550, and the repaired centering roller has better high-temperature abrasion resistance performance, high creep limit, good endurance strength and better thermal fatigue and breakage resistance performance.

Description

technical field [0001] The invention relates to the technical field of laser cladding, in particular to a process method for laser cladding repair of centering rolls commonly used in metallurgical iron and steel enterprises. Background technique [0002] The centering roller table of the large-scale factory of Anshan Iron and Steel Co., Ltd. is a work roller table used for rail transportation located before and after the universal rolling mill. The material of the centering roller is 35# steel, and there is no heat-treated hard layer on the surface. The centering roller table is installed before and after the universal continuous rolling mill. The normal temperature of the roller table is 150-200°C. During rolling, the billet temperature is 1050°C, and the temperature of the contact surface between the centering roller and the billet can reach 500-600°C. Use natural cooling. [0003] In the actual working process, generally use for 15 to 20 days, the centering roller will h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C19/07
CPCC23C24/106C22C19/07
Inventor 宋禹辰萧晗
Owner 宋禹辰
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