Cold rolling apparatus for electromagnetic steel sheet and rolling method

Abstract

The invention discloses a cold rolling apparatus for electromagnetic steel sheet and a rolling method, solving the problem of plate rupture in a straightening machine which is used before a heating device. The cold rolling apparatus comprises a roller mill (2) for cold rolling an electromagnetic steel plate (9), a payoff bobbin (1) for discharging coiled materials (8) to a press (2), and a straightening machine (5) arranged between the press (2) and the payoff bobbin (1), wherein the payoff bobbin (1) is provided with a pre-heating device (6), and a heating device (7) is provided before the press (2). Since the electromagnetic steel plate (9) is preheated by a pre-heating device (6) on the payoff bobbin, and coiled materials (8) are heated by a heating device (7) before the press, the electromagnetic steel plate (9) passing through the straightening machine (5) before the heating device (7) is preheated in the pre-heating device (6) thereby effectively solving the problem of plate rupture in the straightening machine (5) before the heating device (7).

Description

technical field [0001] The invention relates to a cold rolling equipment and rolling method for electromagnetic steel sheets. It is a technique improved to reduce the occurrence rate of plate cracks. Background technique [0002] In the manufacture of electrical steel sheets (silicon steel sheets), the high incidence of sheet cracks in the cold rolling process is a factor that reduces productivity. In an electrical steel sheet, there is an inverse relationship between the temperature of the steel sheet and the cracking sensitivity. When the temperature of the steel sheet is high, the cracking sensitivity is low, and the incidence of cracking of the sheet decreases. Specifically, when the copper plate temperature before rolling is 60° C. or higher, the occurrence rate of plate cracks decreases. In addition, when the temperature of the steel sheet for passing the coil through a rolling mill or tension roll is 60° C. or higher, the occurrence rate of sheet cracking becomes lo...

AI Technical Summary

Problems solved by technology

[0010] In addition, since multiple batch heating devices are installed near the pay-off reel, it is difficult to secure equipment maintenance space and secure access, and the entry side of the rolling equipment tends to become complicated

[0011] In addition, in the heating and dipping tank method, the plate layer of the coil is immersed in the solution. When the coil is passed through the rolling mill or the tension roll, the solution on the steel plate surface will adhere to the rolling equipment, causing equipment corrosion. The problem

[0012] Furthermore, water vapor is generated from the surface of the steel plate, and the image processing of the control camera cannot be processed correctly.

[0013] In addition, although it is possible to install the heating device before the rolling mill, such as Patent Document 3, etc., the steel plate passing through the preceding equipment of the heating device is not heated, and is in a state of high fracture sensitivity.

In the front equipment of the heating device, there is a straightening machine that straightens the steel plate to be flat so that the steel plate having the curvature of the outer diameter of the coil can easily pass through, and there is a problem that the plate is broken in the straightening machine

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