Process for preparing WC hard alloy coating through laser cladding of hot rolling bar apron board roller way

Abstract

The invention relates to a process for preparing a WC hard alloy coating through laser cladding of a hot rolling bar apron board roller way, which is characterized in that weight percentage of spherical casting tungsten carbide is 40-60%, a nickel-based alloy is a bonding phase with weight percentage of 60-40%. The process comprises the following steps: preparing and mixing, machining an operational layer and cleaning the surface, removing oil stain by a solvent or a cleaning compound, removing a rust layer by polishing or sandblasting; performing laser cladding treatment, selecting the bonding phase and the spherical casting tungsten carbide powder with appropriate proportion, adjusting powder feeding rate of an automatic powder feeding apparatus for satisfying the powder feeding rate required by the coat layer thickness; and employing diamond or cubic boron nitride for grinding and processing the cemented carbide coating through laser cladding to the required size. On the hot rolling bar apron board roller way with a common stainless steel material, the WC hard alloy coating with thermal wear resistance is formed on a matrix through laser cladding, service life of the hot rolling bar apron board roller way can be increased, and the laser manufacture of the hot rolling bar apron board roller way can be realized.

Description

technical field [0001] The invention relates to a method for repairing metallurgical equipment parts by using laser cladding technology, in particular to a process method for preparing WC hard composite coating by laser cladding of hot-rolled bar skirt plate roller table, belonging to the technical field of laser cladding. technical background [0002] In the bar rolling production line, the horizontal and inclined layouts are used in conjunction with the skirt plate, and the roller table that directly transports the bar rolled from the last stand to the cooling bed is called the skirt plate roller table. After the red-hot rolling stock passes through, furrows will be formed on the surface of the roller table; at the same time, the peeling of the oxide scale will cause abrasive wear to the roller table, forming micro-cutting on the surface. Therefore, the lack of high-temperature wear resistance of the roller table during the working process leads to the appearance of wear g...

AI Technical Summary

Problems solved by technology

Therefore, the lack of high temperature wear resistance of the roller table during the work process leads to wear grooves as deep as 6-8 mm on the surface. Especially when changing the specifications of the rolled material, the wear groove will cause serious quality problems on the steel surface, and the manual on-line Grinding the roller table will bring difficulties in quality management

[0003] The traditional manufacturing methods of apron rollers include high-alloy integral casting or forging, surface arc surfacing, spraying, carburizing (nitrogen) and other technological methods. It is difficult to meet the quality requirements of apron rollers through online production and use.