Laser repair technology for centring roller bed

Abstract

A laser repair technology for a centring roller bed comprises the following steps: (1) dimension detection, form and location tolerance detection and nondestructive flaw detection of the centring roller bed; (2) mechanical cleaning of the centring roller bed; and (3) preparation of special laser cladding metal powder, and laser repair and post-repair detection of the centring roller bed. The laser repair technology is characterized in that the special laser cladding metal powder comprises 15% of Cr, 5% of Mo, 10% of W, 3% of Ti, 2% of Ta, 2% of W and Co in balancing amount; and the laser technological parameters are as follows: the laser power is 2,000-10,000W, the spot diameter is 0.5-10 mm, the spot movement speed is 30-200 mm / s, the lap width is 0.5-3.5 mm and the thickness of a modified cladding layer is 0.1-5 mm. According to the laser repair technology, metallurgical bonding of the cladding layer and a substrate is realized, the bonding strength is not less than 90% that of the original substrate, and the hardness can meet the working condition requirements of centring rollers.

Description

technical field [0001] The invention relates to a laser repair method for metallurgical components, in particular to a laser repair process for centering roller tables in metallurgical industries (mainly steel mills). Background technique [0002] The centering roller table of a large factory is a working roller table used for rail transportation before and after the universal rolling mill. The material used in its manufacture 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 tandem rolling mill. The normal temperature of the roller table is 150-200°C. During rolling, the temperature of the billet is 1050°C, and the temperature of the contact surface between the centering roller and the billet can reach 500-600°C. The roller body adopts natural cooling. In the actual working process, it is generally used for 15-20 days, and the centering roll will have grooves due to wear. The depth o...

AI Technical Summary

Problems solved by technology

Affected by the overall structure of the centering roller, it takes 14 hours to replace a centering roller, but it only takes 10 hours for a fixed repair, and the replacement of the centering roller cannot be completed during the fixed repair

At present, it is only possible to partially repair the damaged part by online electric welding and surfacing and then grinding. Due to the limited precision of grinding, the key is that the welding material does not have good wear resistance, so the damage still occurs after working for 15 days. getting worse

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