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A repair method for cold rolling back-up rolls

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: 2018-10-30
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

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  • A repair method for cold rolling back-up rolls

Examples

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Effect test

Embodiment 1

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

[0048] 1. Cleaning and flaw detection

[0049] First use gasoline to clean the back-up roller to be repaired to remove oil and impurities on the surface, and wipe it clean; then perform color 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 backing roll is installed with the bearing, it is the supporting part, which directly affects the working performance and safety of the backing roll. If there is a crack on the roll neck 2, due to the harsh working environment of the backing roll, there will be alternating stress, vibrat...

Embodiment 2

[0064] This embodiment provides a method for repairing a cold-rolled backup roll, the repaired cold-rolled backup roll is such as figure 1 As shown, its material is 9Cr 2 Mo, the original working diameter of the support roll base 1 is D=700mm, the diameter of the roll neck 2 is d=380mm, the specific operation steps are:

[0065] 1. Cleaning and flaw detection

[0066] First use gasoline to clean the back-up roller to be repaired to remove oil and impurities on the surface, and wipe it clean; then perform color inspection on the roll neck 2 of the back-up roll, and no cracks are found. Then observe and mark the visible cracks on the surface of the back-up roll substrate 1, mark There are 4 places, and then use the HANWEI HS606 ultrasonic flaw detector to detect the surface of the support roll base 1 to mark the cracks that cannot be recognized by the naked eye, to avoid all the cracks in the subsequent cutting process, and find and mark 2 places. Therefore, the backup roller has a ...

Embodiment 3

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

[0082] 1. Cleaning and flaw detection

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

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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 backup rolls, and more specifically, relates to a method for repairing cold-rolled backup rolls. Background technique [0002] Support rolls are generally used in the key and core parts of plate and strip rolling equipment. They are used to support work rolls or intermediate rolls in rolling mills, so as to prevent the work rolls from flexing and deforming and affecting the quality of the plate shape. The basic parts of large-scale cold rolling and hot rolling equipment. With the rapid development of my country's industry in recent years, the demand for steel has continued to increase. The annual demand for large-scale metallurgical backup rolls, which are the main spare parts in steel rolling production, exceeds 100,000 tons, which costs nearly 10 billion yuan. At present, the manufacturing process of backup rolls needs to go through complicated processes such as electric furnace smelting, out-of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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