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The main reasons for the wear of work rolls

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The strip formed a loop between the rolling mills, resulting in a large wrap angle of the strip to the upper roll, increasing the contact area and pressure; the retention of the regenerated scale on the upper surface of the strip increased the wear of the upper roll. The distribution of the wear amount of the work rolls along the roll length direction is uneven, and the process of forming the wear roll profile is related to the following factors, the size of the rolling unit pressure and its lateral distribution along the strip. According to the principle of tribology, the amount of wear is linearly related to the positive pressure, and the wear of the roll also increases with the increase of the rolling unit pressure, but the lateral distribution of the rolling pressure and the pressure between the rolls is not uniform. Therefore, the general pressure Higher parts will cause increased wear. From F1 to F3 (semi-steel rolls), the changing trend between rolling pressure and wear amount is the same, and F2 pressure is the smallest. Its wear is correspondingly reduced. F4~F7 (cast iron rolls), the roll wear becomes smaller in turn; (2) The total rolling length, the number of contacts between a point on the circumference of the roll and the rolling piece, and the relative slip between the roll and the rolling piece, including the forward slip and back slip values. At present, there are many sites that use the weight of the rolled strip as a sign to measure the wear of the rolls. In fact, the amount of roll wear has a linear relationship with the rolling length, but there is no exact relationship with the rolling weight, because the weight of the rolling stock is not only related to the length of the rolling stock, but also related to the width and thickness of the rolling stock. Therefore, it is unreasonable to simply use the weight of the rolling stock as an index to measure the wear of the roll. During the rolling process, there is relative sliding between the rolling stock and the roll. A reduction in the relative slip value results in a reduction in wear;

 

Roll surface roughness, friction coefficient and roll surface hardness, roll surface condition, such as the condition of regenerated scale; relative slip between work roll and backup roll and lateral distribution of pressure between rolls; product type in each rolling unit (width, weight, material), arrangement of rolling sequence. If the strips of each width are stacked according to their widths from large to small, and stacked according to the rolling quantity, a stepped shape can be formed, and its outer contour is very close to the shape of the roll wear profile curve; Uneven distribution of surface temperature; skewing of work rolls. The continuous movement of the work rolls can promote the uniform wear, and at the same time, it can avoid the increase of the local wear caused by the temperature drop at the edge of the strip.[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column][vc_btn title=”About LMM GROUP” link=”url:https%3A%2F%2Fwww.lmmgroupcn.com%2Fabout-lmm%2F|target:_blank”][vc_column_text css=”.vc_custom_1649296177864{margin-top: 50px !important;}”]friendship Link:

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As professional one-stop solution provider, LIAONING MINERAL & METALLURGY GROUP CO., LTD(LMM GROUP) Established in 2007, and focus on engineering research & design, production & delivery, technology transfer, installation & commissioning, construction & building, operation & management for iron, steel & metallurgical industries globally. 

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