Laser cladding and on-line machining repair method for positioning groove of rough rolling stand roll

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 repair method of laser cladding + online machining of the positioning groove of the rough rolling mill stand; 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), the output continues to increase, and the requirements for equipment are becoming more and more stringent. Huge impact, because the archway is made of cast steel (according to the design drawings, the material of the archway is GS20Mn5, which is similar to domestic ZG20SiMn, which belongs to low-alloy cast steel, and its surface hardness is low, and the har...

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Problems solved by technology

[0002] With the continuous upgrading of Shougang's product quality and variety specifications (strength and precision), the output continues to increase, and the requirements for equipment are becoming more and more stringent. Huge impact, because the archway is made of cast steel (according to the design drawings, the material of the archway is GS20Mn5, which is similar to domestic ZG20SiMn, which belongs to low-alloy cast steel, and its surface hardness is low, and the hardness is not greater than HB200). In the environment, deformation and corrosion are easy to occur, resulting in the continuous decline and decline of equipment function accuracy.

[0003] Due to many years of service of the roughing mill and harsh working conditions, the two sides of the rack roll positioning groove width of 350 (+0.100) on the rack archway (that is, the exit and entrance sides of the transmission side and the operation side, a total of 4 places 8 surface) wear and corrosion (estimated at 3 ~ 8mm), resulting in failure of rack roll bearing installation and positioning accuracy. Therefore, it has a great impact on the steel plate rolling accuracy and the service life of rack rolls.

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