Repair method for crankshaft of constant-width hot press

Abstract

The invention discloses a repair method for a crankshaft of a constant-width hot press. According to the repair method for the crankshaft of the constant-width hot pressure, the surface of the crankshaft is pre-treated to remove an oxide layer and a fatigue layer, the surface of the crankshaft is cleaned and polished, and the machined part of the crankshaft is inspected through a dye penetrant inspection method; the surface of the crankshaft is clad with lasers to prepare a priming layer and a face layer, wherein the priming layer is made of nickel-base alloy powder, and the face layer is madeof cobalt-base alloy powder; a laser cladding machine is adopted, the crankshaft is placed on a workbench, the crankshaft rotates to enable alloy powder to be fed to a laser bath through a powder feeding device, the quantity of the fed powder is adjusted to meet the thickness requirement of a coating, a laser beam and a powder feeding head advance in the axial direction of the crankshaft, and therotating speed is set, so that a uniform and compact laser cladding layer is formed on the machined surface of the crankshaft; and the dye penetrant inspection method is adopted for inspection to avoid the defects of cracks and pores. According to the repair method, a self-lubricating wear-resistant layer is prepared through laser cladding to restore the size of the crankshaft, and the bonding strength of the wear-resistant layer and a matrix is high; and the self-lubricating performance is achieved, so that the service life of the crankshaft is prolonged, and the production quality and the production efficiency of steel billets are guaranteed.

Description

technical field [0001] The invention relates to the technical field of equipment maintenance, in particular to a method for repairing a crankshaft of a hot-rolled constant-width press. Background technique [0002] Hot-rolled fixed-width press is an important equipment for hot-rolled slab width adjustment. Only three companies in the world, Japan MH, IHI and German SMS, can provide complete sets of equipment for hot-rolled fixed-width presses. At present, hot-rolled fixed-width presses in my country's metallurgical industry The presses are all supplied by the above-mentioned companies, and the cost is extremely expensive; among them, the crankshaft is one of the key components of the hot-rolling fixed-width press. [0003] The crankshaft needs to withstand repeated impacts during operation. Due to the long-term wear and tear of the crankshaft and bearings, the shaft diameter becomes smaller, and the gap between the crankshaft and the bearing becomes loose, resulting in the cr...

AI Technical Summary

Problems solved by technology

[0010] According to the applicant's search and verification, there is no precedent for using laser cladding technology to prepare the wear-resistant layer of the crankshaft of the hot-rolled constant-width press and restore the size of the crankshaft, and no relevant reports have been seen.