Method for repairing lining plate-free flat-head cap of spindle of rolling mill

Abstract

The invention discloses a method for repairing a lining plate-free flat-head cap of a spindle of a rolling mill, which comprises the following steps of: performing stress relief annealing on the lining plate-free flat-head cap to eliminate internal stress, performing induction annealing on a flat potential surface to reduce hardness and tempering the flat potential surface in 2 hours; checking to determine the thickness of a fatigue layer of the flat potential surface and performing dye check to determine that cracks are not generated at all; machining to remove the fatigue layer of the flat potential surface, and performing dye check again to determine that cracks are not generated at all; and performing laser cladding on the flat potential surface by adopting gas-atomized nickel-based alloy powder to ensure that a binding layer of a laser cladding layer and a base body matrix has the mechanical strength of over 90 percent of that of the base body and the hardness of 35HRC, machining the cladding layer into the size matched with that of the spindle of the rolling mill, and performing dye check to determine that the flat potential surface is not damaged. The method can repair failed lining plate-free flat-head cap, recover the effect of the lining plate-free flat-head cap, ensure the automatic control and finished product quality of the rolling mill, reduce maintenance cost, and prolong the service life of the lining plate-free flat-head cap.

Description

technical field [0001] The invention relates to a method for repairing a liner-free flat head cover of a rolling mill main shaft. Background technique [0002] Rolling mill flat head cover is a key component in the main drive system of rolling mill. The flat head is the connection between the roll and the main shaft of the rolling mill, which directly bears the impact from the roll. During the operation of the rolling mill, frequent starting and braking, and sudden biting and throwing of the rolled piece will cause sudden changes in the load of the rolling mill. Such load changes will cause torsional vibration of the main drive system of the rolling mill, resulting in The sudden change of the system torque value, in addition, the biting and slippage caused by the inconsistent rolling speed of the upper and lower rolls of the rolling mill will cause damage to the mechanical transmission components and affect the automatic control of the rolling process and the quality of the...

AI Technical Summary

Problems solved by technology

The flat hood without lining is suitable for rolling mills with special rolling process and high rolling safety factor. Usually, after long-term use of the flat hood without lining, the flat surface of the flat hood is severely worn, and the flat hood is scrapped and needs to be replaced. flat headgear, thereby increasing maintenance costs

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