Aluminum plate strip foil rolling mill working roll edge electromagnetic induction heating system and control method

Abstract

The invention discloses an aluminum plate strip foil rolling mill working roll edge electromagnetic induction heating system and a control method, the system comprises an electromagnetic induction heater, a heating power supply and a controller, the electromagnetic induction heater and the heating power supply are connected through a cable, and the heating power supply is electrically connected with the controller; the electromagnetic induction heaters are movably arranged on the two axial sides of the aluminum plate strip foil rolling mill working roller. In the rolling process of the aluminum plate strip foil, the position of the edge of the plate strip foil of the working roller is heated through the electromagnetic induction heater, so that the large temperature change gradient of the working roller in the axial direction is eliminated, and the problem of edge tightness in the rolling process of the plate strip foil is solved; the aluminum plate strip foil rolling mill working roll edge electromagnetic induction heating system has the advantages that the response speed is high, the control precision is high, the production efficiency is high, and the plate strip foil rolling oil injection amount is not changed, the rolled plate strip foil edge cutting amount is reduced, the rolling comprehensive yield is improved, and meanwhile the service life of a finish rolling working roll is prolonged.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal rolling, in particular to an electromagnetic induction heating system and a control method for the edge of a work roll of an aluminum plate, strip and foil rolling mill. Background technique [0002] In the rolling production process of aluminum sheet, strip and foil, especially when the thickness of sheet, strip and foil is less than 0.2mm, there is a special plate shape problem of "tight edge" in the range of about 5.0mm at the edge of sheet, strip and foil. During the rolling process of the aluminum sheet and foil, the temperature distribution of the work roll along the axis direction is not uniform; during the rolling process of the work roll, the rolling heat of the aluminum sheet and foil is generated due to the rolling deformation, which makes the temperature of the work roll rise, and the temperature in the middle part is higher. , and the temperature on both sides is lower due t...

AI Technical Summary

Problems solved by technology

[0002] During the rolling production process of aluminum sheet, strip and foil, especially when the thickness of the sheet, strip and foil is less than 0.2mm, there is a special shape problem of "edge tightness" within the range of about 5.0mm along the edge of the sheet, strip and foil. The reason for this is During the rolling process of aluminum sheet, strip and foil, the temperature distribution of the work rolls along the axial direction is caused by uneven temperature distribution; during the rolling process of the work rolls, the rolling heat is generated due to the rolling deformation of the aluminum sheet, strip and foil, which makes the temperature of the work rolls rise, and the temperature in the middle part is higher , and the temperature on both sides is lower due to faster heat dissipation, so there is a large temperature gradient from the middle to both sides along the axial direction. Due to the existence of this temperature gradient, there is a grain structure on the cross section of the strip and foil during rolling. Inhomogeneous, in which the middle grain is finer, while the two sides have mixed grain structure and coarse grain structure, which leads to the special plate shape problem of "edge tightness"

This problem can easily cause strip breakage in production, which restricts the rolling production speed of aluminum strip and foil, and affects the production efficiency of aluminum strip and foil rolling. At the same time, it can also cause micro-cracks on the edge of the strip and foil during the rolling process. , which increases the amount of edge trimming after rolling and reduces the overall yield; in addition, the problem of "edge tightness" will also cause severe local wear of the finishing work rolls, resulting in a reduction in the service life of the finish rolling work rolls

[0003] In order to solve the above-mentioned "edge tightness" problem, technical means such as "roll bending", "roll shifting", and "section cooling" have been proposed to improve, but the actual application effect is not obvious; There are two technical solutions of "partial oil injection heating work rolls". Among them, "heating work rolls" is to use the work roll heating furnace to heat and keep the whole work rolls warm. The heat is not enough to maintain the optimal working temperature of the work rolls, the temperature of the heated work rolls will drop, and when the temperature of the work rolls drops and a large temperature gradient appears along the axial direction, the rolling operation will be stopped and the work rolls will be sent to work again. The roll heating furnace is used for overall heating and heat preservation, so repeated operations; obviously, although the technical solution of "heating work rolls" can solve the problem of "edge tightness", it will seriously affect the working efficiency of the rolling mill, so it is not a good solution; among them "Partial oil injection heating work roll" is to heat the rolling oil to the set temperature, and then spray it on the edge of the work roll's strip and foil to increase the temperature of the edge of the work roll's strip and foil. Eliminate the large temperature gradient of the work rolls along the axial direction, thereby eliminating the "edge tightness" problem in the rolling process of strips and foils; but the disadvantages of this technical solution are also very obvious. First, the axial direction of the work rolls The control response speed of the temperature gradient change is slow, and automatic feedback closed-loop control cannot be adopted. Only the experience of the operators can be used to control the rolling oil temperature to realize the control of the "edge tightness" problem, so the actual control effect is not stable; the second is through Heating the work rolls with oil injection will greatly increase the residual oil of the strip and foil after rolling, and the distribution in the width direction of the strip and foil is seriously uneven. In order not to affect the quality of the subsequent rolling process, it is necessary to The cleaning process is added before the process and after the final rolling process, so not only the production cycle of the plate, strip and foil is significantly longer, but also the production cost is greatly increased, which seriously affects the economic benefits of the metal plate, strip and foil rolling production enterprise

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