Method for manufacturing hard-face roller of rolling mill

Abstract

The invention discloses a method for manufacturing a hard-face roller of a rolling mill. A number 45 or number 50 steel plate is rolled into a circle to form the roller body of the hard-face roller, the splicing joint of the roller body is made into a Y-type groove to be welded, the welding joint is wrapped in asbestos after the welding, heat preservation and slow cooling are performed, the roller body is rolled again to form a circle, the circular degree is required to be smaller than or equal to 2 mm, before the quenching is performed, a plurality of circular supporting rib plates are arranged on an inner ring of the roller body at intervals, auxiliary tool shaft heads are installed at the two ends of the roller body, and the outer circle of the roller body is machined to have the size before the quenching; the surface of the roller body is quenched in a vertical medium-frequency quenching mode, the roller body is moved into an electric furnace or a gas furnace to be tempered after being quenched; installed tools are dismantled, an inner hole of the roller body is machined to have the size of the hard-face roller, and shaft head wheel disks are installed at the two ends of the roller body; the surface of the roller body is ground to have the size before spraying, and an abrasion-resistant anti-corrosion coating is manufactured on the surface of the roller body, and the surface of the roller body is ground to have the roughness meeting the technological requirement. The method overcomes the defect of strip-shaped color difference of the roller body, the deformation control range of the roller body is controlled, ideal hardness and ideal hardness distribution are acquired, abrasion resistance and roughness are improved, and the service life of the roller is prolonged.

Description

technical field [0001] The invention relates to a method for manufacturing a hard-faced roll of a rolling mill. Background technique [0002] The hard surface rolls of the cold rolling production line, such as tension rolls, top rolls, steering rolls, deburring rolls, etc., have the following characteristics: hollow, thin roll wall, diameter 600-2000mm, roll surface through "hard layer + spraying or chrome plating "Technology Manufacturing. The typical feature of this hard-faced roll manufacturing method is that the roll body is welded with a steel plate roll, and then the surface of the roll body is quenched to obtain a hard substrate with a certain depth, and then a layer of anti-corrosion and wear-resistant coating is made on the hard substrate by spraying or electroplating. [0003] Among them, the production of the hard layer of the roll body has a variety of manufacturing methods according to the difference in technology and equipment capabilities. The first method u...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for manufacturing hard-faced rolls of rolling mills. This method overcomes the strip-shaped color difference defects caused by the uneven hardness of the weld seam of the roll body and the base material structure, and adopts reasonable deformation control means and The quenching process controls the quenching deformation of the roller body within the required range, and obtains the ideal hardness and distribution. The production of the spray coating ensures the wear resistance and roughness of the roller, and prolongs the service life of the roller.

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