Method for repairing fractured roller way spindle nose

Abstract

The invention discloses a method for repairing a fractured roller way spindle nose. The method comprises the following steps: step1, manufacturing a connecting spindle body, assembling and performing abutting joint, drilling inner holes (2) at one end of a spindle nose roller body (1), processing the matching end of the connecting spindle body (3), matching the connecting spindle body and the inner holes (2) of a mandrel (4) and the spindle nose roller body, and axially forming V-shaped grooves (5) on the mandrel (4) on the matching end of the connecting spindle body (3) to discharge air in the inner holes (2) during installation. Step2, welding, (2.1) placing the connecting spindle body (3) and the spindle nose roller body (1) on a lathe to process grooves after assembling, the grooves are V-shaped or U-shaped, and the opening angle is in the range of 45-55 degrees. The assembled work pieces are placed on a roller wheel carrier and heated along rotation, two sides of each groove include 250-300mm of a heating region, and the preheating temperature is in the range of 200-250 degrees centigrade; welding the root of the groove. Step3, performing heat treatment after welding and mechanically processing into the demanded size. According to the repairing method, the fractured spindle nose is welded on the spindle roller body to prevent from bending deformation after being welded.

Description

technical field [0001] The invention relates to steel rolling equipment in the field of metallurgy, and more specifically relates to a method for repairing broken shaft heads of roller tables. Background technique [0002] In the rolling process of hot-rolled strip steel, affected by factors such as the temperature difference between the upper and lower surfaces of the slab, the difference in diameter between the upper and lower rolls, the difference in speed, and the deformation rate, etc., the slab will warp or buckle during the rolling process, that is, the head of the slab will be bent. After the roll bites in, an upward or downward bend is formed on the exit side. The upward bend is called warping, and the downward bending is called buckle. When the buckled steel strip is transported at high speed on the roller table, not only a huge horizontal impact kinetic energy is generated, but also a huge up and down impact kinetic energy is generated due to the slab jumping up a...

AI Technical Summary

Problems solved by technology

[0003] 1. The carbon content of medium-carbon alloy quenched and tempered steel exceeds 0.4%, the weldability is very poor, the hardening tendency and crack tendency of the welded joint are very serious, and very strict requirements are put forward for the welding process

[0004] 2. The frame roll is long and the roll diameter is not large, and the welding heat energy is concentrated locally. Therefore, preventing excessive bending deformation after welding is also a major difficulty

[0005] Because of the above two points, it is difficult to repair the broken roller table and must be replaced immediately, which leads to the increase of production cost and the stability of production

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