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.