Method of coating metal layer on roller surface of biroller thin belt continuous casting machine

Abstract

A technology for plating the nano-Ni working layer on the surface of roller of the dual-roller thin-band conticaster includes such steps as cleaning the surface of roller, and electrochemical cleaning, activating, plating of binding layer and plating of Ni layer by moving the plating pen along the roller surface at the rotation speeds of 10-14, 12-16, 12-16 and 14-20 rpm under the voltages of 14-16, 18-20, 22-24 and 16-24 V.

Description

technical field [0001] The invention relates to the field of metal continuous casting, in particular to a treatment for the outer surface of casting rolls, in particular to a method for coating metal on the roll surface of a twin-roll strip continuous casting machine Background technique [0002] Twin-roll thin strip continuous casting technology is a cutting-edge technology in the field of metallurgy and material research. It realizes the forming process of metal from melt to strip billet with short process and low cost. The working principle of the twin-roll strip continuous casting machine (referred to as the casting machine) is as follows: cooling pipes are installed in the casting rolls, two casting rolls and side sealing plates at both ends form a molten pool, and the melt is in the two horizontal installations of the casting machine. The counter-rotating casting rolls are cooled by the casting rolls, thereby solidifying and forming a strip. During continuous casting,...

AI Technical Summary

Problems solved by technology

Although this method can improve the performance of the metal coating of the roller sleeve in terms of thermomechanical stress resistance, slow down or even avoid cracks in the edge area, and prolong the service life of the roller sleeve, there are some defects in the electroplating process, such as current density. Low, about 1~6A / dm 2 , so the deposition rate of the nickel layer is slow, about 0.5-1.0μm / min·dm 2

Therefore, for a casting roll with a specification of 250×150, it takes 100 to 400 hours to obtain a nickel metal layer with a thickness of 1 to 2 mm, which requires a long time and high cost.

At the same time, the hardness of the electroplated nickel layer is low, about 200-300HV, and the surface of the casting roll needs to bear the hard shell of the solidified billet and the high-temperature wear and thermal fatigue wear of the side sealing plate. Therefore, it will soon occur during the casting process. Wear, short service life of coatings