Work roll shape technology that takes into account both grinding accuracy and edge drop control of cold-rolled electrical steel

Abstract

The invention relates to a working roll forming technology taking grinding precision and efficiency and cold-rolled electrical steel edge drop control into consideration. The sectional roll forming function method is adopted, a special cold-rolled working roll forming curve is formed, and the coefficient of an exponential function curve in the roll forming curve is designed according to the situation of band steel edge drop; a primary straight line is a smooth transition section outside the exponential function curve and prevents stress concentration between rolls caused when a working roll makes contact with an intermediate roll under action of roll bending force; two flat roll sections are provided, wherein the first flat roll section is the section, making contact with a band steel body part, of the roll surface of the working roll, the second flat roll section is located at one end of the roll surface of the working roll, and the purpose is to improve the grinding precision and efficiency of the working roll. After curvilinear functions of all sections are determined, the curvilinear functions are expressed by sections. The working roll forming technology can effectively improve the cold-rolled electrical steel edge drop control level, improve the roll grinding precision and efficiency, reduce the roll consumption, and lower the cold-rolled electrical steel production cost.

Description

technical field [0001] The invention relates to metallurgical machinery, automation and rolling technology. Specifically, it refers to a high-precision edge drop control work roll shape technology for cold-rolled electrical steel that takes into account both grinding accuracy and efficiency. Background technique [0002] Shape is one of the most important quality indicators of strip products, and the shape control technology and process have also become the most value-added and technical components of strip rolling mills. Cold-rolled electrical steel sheet, as an excellent soft magnetic functional material with high efficiency, energy saving and large consumption, is the focus of the structural adjustment of my country's iron and steel industry. Compared with the international advanced level, there is a certain gap between the edge drop control level of cold-rolled electrical steel in domestic enterprises, and there are often large-scale objections to the shape quality caus...

AI Technical Summary

Problems solved by technology

In terms of roll shape, it mainly focuses on the research of tapered rolls. Although some results have been achieved, there are few adjustable parameters for each roll shape curve in the existing results, and the degree of adaptability to the diversity of strip edge drop is small, and the design The rolled shape does not take into account the grinding problem of the roll after it is off the machine, especially for the narrow-sized electrical steel rolled by a wide-sized rolling mill, the taper section of the roll is longer, and the problems of low grinding accuracy and efficiency of the roll are more prominent

[0007] Since the edge drop control section is conical, with the grinding of the conical curve, the outer edge of the grinding wheel is no longer parallel to the direction of the roll surface but has a certain angle. There is no compensation measure for the reduction of roll grinding accuracy, and the grinding accuracy of the final roll shape curve is seriously affected

On the other hand, in order to ensure the grinding accuracy of the roll shape curve, the grinder will monitor the roll shape online. When the deviation between the ground roll shape and the target roll shape exceeds the allowable value, the grinder will grind the work roll again until The roll shape curve reaches the allowable deviation range of the target roll shape. Therefore, the decline in the grinding accuracy of the roll shape curve will lead to an increase in the grinding time and grinding amount of the work roll, and a decrease in grinding efficiency.

To sum up, when the roll shape curve of the conventional edge drop control roll is ground, the roll shape accuracy and grinding efficiency are relatively low, which seriously affects the product quality and continuous production of cold rolling, and increases the production cost at the same time

[0008] Document 1 (Study on the roll shape of the back-up roll controlled by the side drop control of the wide-band steel tandem cold rolling mill, 2008, Journal of Central South University) studied the integrated model of the work roll / variable contact back-up roll, and studied the influence of the entire roll system on the side drop. Edge drop control method; Document 2 (Silicon steel edge drop control technology for UCM cold tandem mill, Journal of Beijing University of Science and Technology) adopts a sixth-degree curve at the end of the roll to form a tapered roll to solve the strip edge drop; Document 3 (UCMW rolling mill sine function shape Single-taper work roll edge drop control, 2009, Journal of Beijing University of Science and Technology) adopts a sinusoidal curve at the end of the roll shape to solve the strip edge drop, but the roll shape curve designed in Document 3 contains fewer parameters, which is not enough for actual production The flexibility of the design of the roll shape curve is required when the position and degree of the edge drop change in a wide range. The above technologies have not considered the key issues closely related to production, such as the edge drop control, the grinding accuracy and efficiency of the work roll roll shape, etc.

[0009] According to the retrieved literature, no method has been retrieved to effectively control the edge drop of cold-rolled electrical steel while using the work roll profile technology in cold rolling while taking into account the grinding accuracy and efficiency of the work roll

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