Laser cladding and on-line machining repair method for roughing mill housing roller positioning groove

Abstract

The invention relates to a laser cladding and on-line machining repair method for a roughing mill housing roller positioning groove, and belongs to the technical field of surface modification and equipment repair. Machining equipment comprises a 2500 movable boring and milling machine, an all-solid-state laser device, a mechanical hand, a manipulator, a pneumatic powder feeder, a self-made construction platform and the like. The technological process includes the steps of building the platform, leading in the equipment, adjusting, centering and fixing the equipment, performing rough machining, performing precision measurement for flaw detection, performing laser cladding, performing precision measurement for flaw detection, fine machining, performing precision measurement for flaw detection and tracking to verify the effect. The laser cladding and on-line machining repair method has the advantages that the equipment strength is not affected, hot stress influence during repair welding is avoided, while equipment accuracy is recovered, the outage time can be shortened, and the repair cost can be reduced; a metal base material can be effectively protected from abrasion or corrosion by selecting a repair material, the problem is prevented from occurring again, and the service life of the equipment is greatly prolonged; as only the surface of the base material is melt in a micro mode in the laser machining process, the area of a laser cladding heat affected zone is one tenth that of a heat affected zone of argon arc welding.

Description

technical field [0001] The invention belongs to the field of surface modification technology and equipment maintenance technology, and in particular provides a laser cladding + online machining repair method for positioning grooves of rolls in rough rolling mills; The dimensional accuracy of the positioning groove is improved, and the surface hardness is significantly improved, and the characteristics of wear resistance, corrosion resistance and impact resistance are improved. Background technique [0002] With the continuous upgrading of Shougang's product quality and variety specifications (strength and precision), and the continuous increase in output, the requirements for equipment are becoming more and more stringent. The archway of Shouqin 4300 rolling mill works in high temperature and high humidity environment all the year round, and bears huge impact force, and the material of the archway is cast steel (according to the design drawings, the material of the archway i...

AI Technical Summary

Problems solved by technology

The archway of Shouqin 4300 rolling mill works in high temperature and high humidity environment all the year round, and bears huge impact force, and the material of the archway is cast steel (according to the design drawings, the material of the archway is GS20Mn5, which is similar to domestic ZG20SiMn and belongs to low alloy cast steel , the surface hardness is low, the hardness is not greater than HB200), in high temperature and high humidity environment, it is easy to deform and corrode, resulting in the continuous decline and decline of equipment function accuracy

[0003] Due to many years of service and harsh working conditions of the 4300 rough rolling mill, the positioning groove width of the rack roll on the rack archway is 350 (+0.100) on both sides (that is, the drive side, the outlet side and the inlet side of the operation side, a total of 4 places 8 surface) severe wear and corrosion (estimated at 3-8mm), resulting in failure of the installation and positioning accuracy of the rack roller bearings

Therefore, it has a great influence on the precision of steel plate rolling and the service life of rack rolls

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