Brush plating technology for restoring rolling-mill gear shaft by using pulse electric brush plating

Abstract

A related brush plating technology for restoring a rolling-mill gear shaft by using pulse electric brush plating comprises (1) cleaning the gear shaft; (2) performing electric purifying; (3) activating; (4) performing brush plating on a bottom layer; and (5) performing brush plating on a working layer. A plating repaired by the technology is uniform in surface, free of cracks, free of burrs, and free of cracking and stripping phenomena. The pulse electric brush plating technology is capable of effectively reducing the tensile stress of the plating and even obtaining pressure stress, thereby substantially improving the thickly plating capacity of brush plating, the single-side plating thickness reaches 1 mm or more, and the combination strength is high. The restored gear shaft well runs, the cost is reduced and the economic benefit is improved.

Description

Technical field [0001] The invention relates to the technical field of brush plating, in particular to a brush plating process for repairing rolling mill gear shafts by pulse electric brush plating. Background technique [0002] φ400 rolling mill is a kind of rolling mill commonly used in rolling mills. The rolling mill often uses 40Cr as its herringbone gear journal material. This kind of herringbone gear journal will cause large area strains due to oil pollution during work. There are both shallow strains ranging from 0.01mm to 0.03mm and deep strains up to 2.5mm deep. As a result, the herringbone gear journal cannot work normally and the rolling mill cannot be produced. In particular, some parts with severe damage such as gear shafts of large rolling mills are expensive (few or no spare parts), and the processing cycle is long. For units that are in production, it is impossible to replace new parts in terms of economy or time. Accepted. [0003] The strain on the herringbone ...

AI Technical Summary

Problems solved by technology

Therefore, there is little research on the repair of the strain of the herringbone gear shaft at present, and there is no simple and effective repair method at present.