JPS6059969B2 - Method and device for cooling metal strips - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for cooling metal strips in a continuous metal strip processing line.

In the method of cooling a metal strip while being wound around a rotary cooling body, in order to uniformly cool the metal strip in the width direction, it is necessary to bring the metal strip into contact with the surface of the rotary cooling body with an even surface pressure. For this reason, the outer peripheral shape of the rotary cooling body must be flat, which results in the metal band meandering during the process of transporting the metal band while being wound around the rotary cooling body. The object of the present invention is to solve the above-mentioned problems and to obtain stable threadability and uniform cooling characteristics of the metal strip. A method of heating a running metal strip in a continuous metal strip processing line, and then cooling the metal strip while winding it around a cooling roll provided with hollow holes in the lengthwise direction of the body and through which a refrigerant flows is described, for example, in JP-A-51- This is proposed in Publication No. 104417.

According to the research conducted by the present inventors, it is clear that when cooling a metal strip using a rotating cooling body through which a refrigerant flows, the contact surface pressure between the rotating cooling body and the metal strip greatly influences the cooling characteristics.

That is, as a first aspect of the present invention, a high-temperature metal strip in a continuous metal strip processing line is introduced into a rotary cooling body group including a rotary cooling body whose center axis is variable and can be adjusted to an arbitrary angle with respect to the bus line. A second invention provides a method for cooling a metal strip characterized by transferring the metal strip while winding the metal strip, and furthermore, as a second invention, a refrigerant is passed through the inner circumferential surface of the body in a continuous metal strip processing line, and an optional cooling method is provided for the bus line of the metal strip. A rotary cooling body group including a rotary cooling body with a variable center and axis that can be adjusted to an angle of The present invention provides a cooling device for a metal strip, which is provided with an arithmetic mechanism that inputs a detected value of the meandering amount as a control amount of the angle of the rotating body.

When cooling a metal strip in a continuous metal strip processing line, it is known that it is necessary to uniformly cool the metal strip in both the width direction and the length direction due to quality constraints of the metal strip.

Furthermore, when transporting the metal strip on the above-mentioned line, it is necessary to minimize meandering of the metal strip in order to prevent scratches and breakage of the metal strip. Furthermore, when understanding the heat transfer characteristics between the metal band and the refrigerant in the rotary cooling body as the cooling characteristics of the metal band, the contact surface pressure between the rotary cooling band and the metal band has a large influence on the cooling characteristics.

Therefore, according to the present invention, it is extremely effective to bring the metal strip into contact with the rotary cooling body in the width direction thereof with uniform surface pressure.

On the other hand, in a continuous metal strip processing line, the rotating body that winds the metal strip and transports the metal strip usually has a crowning process applied to the outer periphery of the rotating body in order to prevent the metal strip from meandering. The shape of the metal strip is not completely smooth;
If the metal band is wound around a rotating body that is flat in the width direction and transported, it is inevitable that the metal band will meander. That is, the present invention provides a rotary cooling body equipped with a mechanism for tilting the central axis of rotation of a part of the rotary cooling body group according to the amount of meandering of the metal strip immediately before and after (or on one side of) the rotary cooling body group. This proposes that meandering can be corrected by tilting.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is an overall explanatory diagram of this invention, and FIG. 2 is an explanatory diagram of essential parts of this invention.

As is well known, the continuous annealing furnace has a heating chamber (not shown) for the metal band 4.
, soaking chamber 10, primary cooling chamber 11, over-aging chamber. The chambers 12 are connected to each other, and a secondary cooling chamber (not shown) is further provided.

That is, the metal strip 4 is sequentially cooled while being wound around the rotary cooling body 2 and passes through the rotary cooling body group 5.

At this time, on the inlet and outlet sides of the rotary cooling body group 5, metal J
The band meandering amount detection end 1 measures the amount of meandering from the bus line center, transmits the information to the drive device of the rotation center shaft tilting device 3, and tilts the metal band to always position the metal band near the line center. Can be done. In the figure, two rotation center axis tilting devices 3 are shown, but it goes without saying that an appropriate number may be selected depending on the equipment situation.

That is, the rotary cooling body having a variable center axis according to the present invention is installed inside the rotary cooling body group 5. A specific example of a rotation center axis tilting device and a control method thereof will be explained in FIG.

In the figure, the cooling rotor 2 is also supported by a frame arm 25 and a bearing 26.

The frame arm 25 is supported by a shaft 24, and the control amount of the cylinder 23 is transmitted thereto. Detection end 1T as an example of a control device
V-cameras are provided at both edges of the metal strip, and a video DC converter 20 and a cylinder position controller 21 are provided.

The cylinder position controller 21 is also provided with a pressure generator 22 . Thus, according to this invention, both edges of the metal strip are monitored by one TV, the edge position of the metal strip is determined from the video output, and the amount of deviation from the position based on the line center is output as an electrical signal. The position of the cylinder is controlled according to this output amount.

Thus, the position of the cylinder determines the angle of inclination of the central axis of the rotating body. As a method for tilting the rotating body, an electric motor or the like may be used instead of a cylinder.

As detailed above, according to the present invention, it is possible to bring the metal strip into contact with the surface of the rotary cooling body with uniform surface pressure in the width direction, which not only improves the material quality but also prevents the metal strip from entering the eaves and breaking. The effect is great.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of the invention, and FIG. 2 is an explanatory diagram of the main part of the invention. 1: Metal band meandering amount detection end, 2: Rotary cooling body, 3: Rotation center axis tilting device, 4: Metal band, 10: Soaking chamber, 11: Secondary cooling chamber, 12: Overaging chamber.

Claims (1)

[Claims] 1. In a continuous metal strip processing line, a group of rotating cooling bodies for cooling the high temperature metal strip is provided, and the group of rotating cooling bodies is adjusted to an arbitrary angle with respect to the pass line of the high temperature metal strip. A method for cooling a metal strip, characterized in that a rotary cooling body with a variable center axis is installed therein, and the metal strip is cooled by being introduced into the group of rotary cooling bodies. 2. In a continuous metal strip processing line, a group of rotary cooling bodies for cooling the high-temperature metal strip is provided, and a refrigerant is circulated through the inner circumferential surface of the body through the group of rotary cooling bodies, and an arbitrary temperature is applied to the pass line of the metal strip. A rotary cooling body with a variable center axis that can be adjusted to an angle of A cooling device for a metal strip, characterized in that a calculation mechanism is provided for inputting the angle of the cooling body as a control amount.