Hot-rolling supporting roll surface defect repair method

Abstract

The invention provides a method for repairing surface defect of a hot rolling support roll, and relates to the technical field of repairing a roll for hot rolling equipment. The method comprises the following steps: 1, the depth and the area of the defect are determined; 2, the defect part is punched, and the deflect metal layer is removed from the surface of the roll; 3, whether the deflect is clearly treated is checked; and 4, the punching part and parts around the punching part are polished to form a smooth curved surface and the repair is completed. During polishing, edges of all sharp angles are polished to be smooth, and paraboloids are the best to be formed around the deflect and the joint between the deflect and a roll body. The method makes polishing repair on local deflect parts only, and after repairing, the diameter of the roll body of the support roll is not changed, thereby lowering roll wear, prolonging the life cycle of the support roll, and further improving yield of a rolling machine.

Description

technical field [0001] The invention relates to the technical field of repairing rolls for hot rolling equipment, in particular to a method for repairing surface defects of hot rolling support rolls. Background technique [0002] The hot-rolled backup roll is one of the important spare parts in the hot-rolled production line. The hot-rolled backup roll is under the condition of high pressure, thermal stress, fatigue stress and wear for a long time, and the working condition is very bad. Therefore, the hot-rolled backup roll The surface is prone to defects such as fatigue wear, local surface cracks and local peeling, which make the hot-rolled backup rolls invalid. Support roll local surface cracks and local peeling such as figure 1 shown. [0003] In view of the local cracks and spalling of the hot-rolled back-up rolls, the current method of repairing the back-up rolls is: using grinding combined with eddy current flaw detection, ultrasonic flaw detection, and magnetic part...

AI Technical Summary

Problems solved by technology

Since this method is to turn the entire back-up roll body, the roll diameter of the back-up roll is changed, resulting in a waste of the effective working layer of the back-up roll, and the loss of the back-up roll is large, especially for local surface cracks less than 100mm and peeling depth When it is less than 40mm, the above method of repairing the back-up roll will result in greater roll consumption and longer repair time

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