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Repair method of cold-rolled support roller

A repair method and backup roll technology, applied in the field of cold-rolled backup rolls, to achieve the effects of good bonding, improved wear resistance, and high surface hardness

Active Publication Date: 2017-02-22
马鞍山市恒强合金科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that existing cold-rolled back-up rolls are scrapped due to surface defects such as cracks and spalling, and the above-mentioned defects are repaired by surfacing or thermal spraying, the invention provides a repair method for cold-rolled back-up rolls. Carry out special treatment with the roller sleeve, and then insert the roller sleeve on the base of the back-up roll to form a whole, and finally machine the repair of the back-up roll

Method used

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  • Repair method of cold-rolled support roller

Examples

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Effect test

Embodiment 1

[0047] This embodiment provides a method for repairing cold-rolled back-up rolls, and the repaired cold-rolled back-up rolls are as figure 1 As shown, its material is 9Cr 2 Mo, the original working diameter D of back-up roll matrix 1 = 650mm, the diameter d of roll neck 2 = 360mm, the specific operation steps are:

[0048] 1. Cleaning and flaw detection treatment

[0049] First use gasoline to clean the back-up roll to be repaired, remove surface oil and impurities, and wipe it clean; then carry out coloring inspection on the roll neck 2 of the back-up roll, if cracks are found on the roll neck 2, the back-up roll is scrapped and cannot be repaired. Because the roll neck 2 is the position where the backup roll installs the bearing, it is the supporting part, which directly affects the working performance and safety of the backup roll. In addition, as the working time continues, the cracks will slowly expand to the surroundings, not only the stability of the back-up roll will...

Embodiment 2

[0064] This embodiment provides a repair method for cold-rolled back-up rolls, the repaired cold-rolled back-up rolls such as figure 1 As shown, its material is 9Cr 2 Mo, the original working diameter of back-up roll matrix 1 is D=700mm, and the diameter of roll neck 2 is d=380mm. The specific operation steps are:

[0065] 1. Cleaning and flaw detection treatment

[0066] First use gasoline to clean the back-up roll to be repaired, remove surface oil and impurities, and wipe it clean; then carry out coloring inspection on the roll neck 2 of the back-up roll, and no cracks are found, then observe and mark the cracks visible to the naked eye on the surface of the back-up roll base 1, mark There are 4 places, and then use HANWEI HS606 ultrasonic flaw detector to detect flaws on the surface of backup roll base 1, mark cracks that cannot be recognized by naked eyes, so as to avoid that all cracks cannot be removed during subsequent cutting, and 2 places are found and marked. Ther...

Embodiment 3

[0081] This embodiment provides a method for repairing cold-rolled back-up rolls, and the repaired cold-rolled back-up rolls are as figure 1 As shown, its material is 9Cr 2 Mo, the original working diameter D of back-up roll matrix 1 = 750 mm, the diameter d of roll neck 2 = 400 mm, the specific operation steps are:

[0082] 1. Cleaning and flaw detection treatment

[0083] First use gasoline to clean the back-up roll to be repaired, remove surface oil and impurities, and wipe it clean; then carry out coloring inspection on the roll neck 2 of the back-up roll, and no cracks are found, then observe and mark the cracks visible to the naked eye on the surface of the back-up roll base 1, mark There are 2 places, and then use HANWEI HS606 ultrasonic flaw detector to detect flaws on the surface of backup roller base 1, mark cracks that cannot be recognized by naked eyes, so as to avoid that all cracks cannot be removed during subsequent cutting, and 5 places are found and marked. ...

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Abstract

The invention discloses a repair method of a cold-rolled support roller, and belongs to the technical field of cold-rolled support rollers. The method comprises the following operation steps: the cleaning and flaw detecting treatment is firstly performed; then, cracks on the surface of a support roller basal body are removed by machining; a roller sleeve is machined for corresponding heat treatment; and finally, the obtained roller sleeve is heated to embed in the support roller basal body to finish repair of the cold-rolled support roller. Compared with traditional overlaying repair and thermal spraying repair modes, the repair method is simpler, and can repair scraped support rollers with bad wear and deeper cracks; the repaired support rollers satisfy the comprehensive mechanical performances and the service life requirements, and the manufacturing period of the support rollers is shortened; and the method can perform repair by multiple times, reduces the cost, and saves the energy consumption.

Description

technical field [0001] The invention belongs to the technical field of cold-rolled back-up rolls, and more specifically relates to a repair method for cold-rolled back-up rolls. Background technique [0002] Back-up rolls are generally used in the key and core parts of strip rolling equipment. They are important parts used to support work rolls or intermediate rolls in the rolling mill so as to prevent the work rolls from being deflected and deformed during rolling and affecting the quality of the plate. Basic parts of large cold rolling and hot rolling equipment. With the rapid development of my country's industry in recent years, the demand for steel continues to increase. The annual demand for large metallurgical backup rolls, which are the main spare parts in steel rolling production, exceeds 100,000 tons, costing nearly 10 billion yuan. At present, the manufacturing process of backup rollers needs to go through complex processes such as electric furnace smelting, out-o...

Claims

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Application Information

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IPC IPC(8): B23P6/00
CPCB23P6/00
Inventor 陶华平陶邦勤
Owner 马鞍山市恒强合金科技股份有限公司
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