A Method for Partially Grinding the Working Face of Cold-rolled Back-up Rolls
A technology for supporting rolls and working faces, which is applied in the field of partial grinding of the roll surface, which can solve problems such as the indetermination of the depth of cracks, the inability to guarantee the quality of grinding, and the impact on the normal use of rolls, achieving good stability and reliability, and good promotion The use value and the effect of reducing roll consumption
Active Publication Date: 2018-11-30
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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Problems solved by technology
At present, there is no clear determination in the industry on how to grasp the size and shape of local grinding during the maintenance of cold-rolled backup rolls, and the method of penetrant flaw detection is used to determine the shape and depth of roll surface defects, but the existing penetrant flaw detection methods only It can determine whether there are cracks on the roll surface, and display the length, width and shape of the cracks, but cannot determine the depth of the cracks. Therefore, it is very difficult to use local grinding, and the quality of grinding cannot be guaranteed, which affects the quality of the roll after it is put on the machine. Normal use
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[0029] The implementation steps of the rapid partial grinding method for the working face of the back-up roll of the present invention are: (1) determine the crack depth by penetrant flaw detection; (2) determine the size and shape of the local grinding; (3) perform roll surface grinding.
[0030] Step 1 Determination of Crack Depth Using Penetrant Testing
[0031] Cracks generated by cold-rolled backup rolls under the action of external forces. When a rolling accident occurs, the contact stress between the rolls suddenly increases, or the strip steel is involved, causing cracks on the surface of the back-up rolls. By observing the crack state of cold-rolled back-up rolls, summarizing the law of penetration flaw detection maps, and creatively providing a crack depth judgment method.
[0032] The principle of penetrant testing is to use the capillary phenomenon to make the penetrant penetrate into the surface opening defect, remove the excess penetrant on the surface after cle...
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Abstract
The invention belongs to the technical field of roller flaw detection and maintenance methods, and relates to a method for conducting local coping on the work face of a cold rolling supporting roller so as to conduct rapid local coping on the work face of the cold rolling supporting roller. According to the technical scheme of the method, post-spraying development is conducted on a roller crack through a penetrating agent, the crack depth is determined according to the crack width and color displayed by a crack image, then, the coping pit diameter and depth are calculated through the formula, and finally local coping is conducted. The invention creatively provides a method for determining the crack depth only through the penetrating agent, meanwhile, the calculation formula determining the size and shape requirements is creatively provided for a coping pit, the coping efficiency of the cold rolling supporting roller is greatly improved, and roller consumption and roller repairing cost are effectively reduced. A tool is easy to obtain, operation is simple and convenient, and cost is low; and after repairing, the roller has good stability and reliability, the method is particularly suitable for conducting coping treatment on the cold rolling supporting roller on the site, and extremely high popularization and usage value is achieved in the industry.
Description
technical field [0001] The invention relates to a method for fast local grinding of the working surface of a cold-rolled support roll, which is particularly suitable for quickly determining the crack depth and local grinding of the roll surface on site, and belongs to the technical field of roll flaw detection and maintenance methods. Background technique [0002] At present, when metallurgical enterprises deal with the problem of local spalling or cracks on the working surface of cold-rolled backup rolls, most of them adopt the method of overall grinding of the working surface of the roll. The use of integral grinding to eliminate local defects on the roll surface is a huge waste of the roll. The overall grinding not only takes up the time of the grinding machine, but also causes a huge loss of various auxiliary material resources, and it is also easy to cause poor operation of the back-up roll preparation operation. [0003] In the roll maintenance process, in addition to ...
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IPC IPC(8): B21B28/02
CPCB21B28/02
Inventor 许斌张卫革王清义张庆华张志扬万承胜国修路杨响云
Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY