Hot-rolling supporting roll surface defect repair method

A defect repair and backup roll technology, applied in the field of hot-rolled backup roll surface defect repair, can solve the problems of large backup roll loss, long repair time, large roll consumption, etc. The effect of roller wear

Inactive Publication Date: 2009-06-10
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 i

Method used

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  • Hot-rolling supporting roll surface defect repair method
  • Hot-rolling supporting roll surface defect repair method

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Embodiment Construction

[0019] Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0020] The core of the present invention is to only perform grinding and repair on local defective parts, and the diameter of the whole back-up roll remains unchanged after the repair, thereby reducing roll consumption, prolonging the service life of the back-up roll, and further increasing the production capacity of the rolling mill.

[0021] In this embodiment, the method for repairing surface defects of hot-rolled back-up rolls is carried out in the following steps:

[0022] 1. Determine the depth and area of ​​the defect;

[0023] 2. Make holes on the defective parts and remove the defective metal layer from the roller surface;

[0024] 3. Check whether the defects are dealt with cleanly;

[0025] 4. Grind the hole and its surroundings to form a smooth surface; so far, the repair is completed.

[0026] Specifically, step 1 uses ultr...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): B23P6/00
Inventor 孟传胜韩斌谭文
Owner WUHAN IRON & STEEL (GROUP) CORP
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