JPH07102373B2 - Rolling roll cooling device - Google Patents

Description

The present invention relates to an improvement of a closed water jacket type rolling roll cooling device.

<Prior Art> In hot rolling, a large amount of heat flux is generated from a material to be rolled to a rolling roll during rolling, resulting in roughening of the roll due to thermal fatigue of the roll and thermal expansion of a threaded portion of the roll. In order to prevent surface defects and poor flatness caused by these, it is necessary to cool the rolling roll.

Conventionally, cooling of a rolling roll has been performed by spraying cooling water on the surface of the rolling roll during rolling, and the sprayed cooling water collides with the surface of the roll, and heat is exchanged there.

In such a spray-type cooling method, the area in which the cooling water comes into contact with the roll is limited, and even if the amount of cooling water is increased, the cooling area does not change, and a significant increase in the cooling effect cannot be achieved. There was a point.

Further, the cooling water sprayed and collided with the rolling rolls is scattered and falls onto the material to be rolled during rolling, which lowers the rolling temperature, which wastes energy and makes it difficult to control the material of the material to be rolled. There was a problem that

As a countermeasure against this, a cooling water jacket is provided along the outer circumference of the rolling roll so that the cooling water comes into contact with the outer circumference of the rolling roll, and a seal portion is formed along the outer circumference of the cooling water jacket. A closed water jacket type rolling roll cooling device that cools the rolling roll during rolling by supplying the roll cooling water into the cooling water jacket while pressing it against the outer circumference and collecting the cooling water after cooling the rolling roll. Is proposed. this is,
A closed cycle that directly collects the cooling water supplied to the water jacket is formed to reduce the amount of cooling water used and prevent the cooling water after cooling from leaking onto the rolled material (for example, actual (See JP-A-59-162107).

<Problems to be Solved by the Invention> However, in a conventional closed type water jacket type roll cooling device, when changing a rolling roll to a roll having a different roll diameter depending on a rolled material, if the roll diameter changes, Since there is a gap between the seal portion and the rolling roll and water leaks from this, there is a problem that it must be prepared for each rolling roll having a different diameter.

As a means for pressing the seal portion against the outer circumference of the rolling roll, a belt is used or the above-mentioned actual development number 59-162107.
Some of them use a counter weight as in Japanese Patent Publication No. JP-A-2003-138, but in these pressing means, the pressing force of the seal part on the outer circumference of the rolling roll may become uneven. In this case, the pressing force is weak. There is a problem that water leakage occurs from a part, and there is a problem that if the rolling roll is locally worn or roughened, the sealing performance is rapidly lowered. Furthermore, when a high degree of sealing property required for dry rolling is required, even if the rolling roll is not locally worn or roughened, that is, in the so-called initial roll state, the above-mentioned pressing means has poor sealing performance and is extremely difficult to use. Have difficulty.

An object of the present invention is to provide a rolling roll cooling device that solves these problems.

<Means for Solving the Problems> In the present invention, a cooling water jacket is provided along the outer circumference of the rolling roll so that the cooling water contacts the outer circumference of the rolling roll, and the cooling water jacket is arranged along the outer circumference of the rolling roll. A sealing part is formed around the part, and while pressing the sealing part on the outer circumference of the rolling roll, the cooling water is supplied into the cooling water jacket to cool the rolling roll during rolling, and the cooling water after cooling the rolling roll is collected. In a closed type water jacket type rolling roll cooling device configured to do so, an outer sealing part that surrounds the sealing part with a space and forms a space that comes into contact with the outer circumference of the rolling roll is provided. A suction means for holding a vacuum is connected to the space.

<Operation> By keeping the space formed by the outer seal part in vacuum by the suction means, even if the cooling water leaks from the seal part, the leaked cooling water is immediately sucked and removed, and the space is vacuumed. Therefore, the evaporation temperature is lowered, and the thin film cooling water strongly adhered to the surface of the rolling roll can be removed.

<Example> An example of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of an embodiment of the cooling device of the present invention,
FIG. 2 is a sectional view of the cooling device of FIG. 1 in a direction perpendicular to the rolling roll axis.

In the figure, 1a is a work roll of the rolling mill, and 1b is a backup roll. A cooling water jacket 2 is composed of a cooling pad body 3 and a water supply / drainage block 4 attached to the back surface of the cooling pad body 3.

Reference numeral 5 denotes a seal portion arranged around the portion of the cooling water jacket 2 along the outer circumference of the rolling roll 1, that is, on the upper and lower sides of the cooling water pad main body 3 and on both left and right axial ends of the work roll 1a. The seal 5a of the seal portion 5 is made of a resin material having heat resistance and flexibility, and the top and bottom edges of the seal 5a are formed so as to be inclined along the cylindrical surface of the work roll 1a. 5a is formed in an arc shape along the circumferential surface of the work roll 1a.

A water supply header 6 and a drain header 7 are formed in the cooling pad body 3, and a water supply pipe 6a is connected to the water supply header 6 and a drain pipe 7a is connected to the drain header 7 via the water supply / drain block 4, respectively. The cooling water is supplied as a water film to the gap between the cooling water pad main body 3 and the work roll 1a via the water supply pipe 6a and the water supply header 6, and the drainage after cooling is discharged from the drainage header 7 via the drainage pipe 7a. Drained.

Reference numeral 8 denotes an outer seal portion which surrounds the seal portion 5 with a space and forms a space 9 in contact with the outer periphery of the work roll 1a. This space is evacuated by a vacuum pipe 10. It is connected to a suction means (not shown) for holding.

Thus, by keeping the space 9 in vacuum by the suction means, even if the cooling water leaks from the seal portion 5, the leaked cooling water is immediately sucked and removed, and since the space 9 is vacuum, the evaporation temperature is reduced. And the thin film cooling water firmly adhering to the surface of the work roll 1a can be removed.

If the suction means has a sufficient capacity to hold the space 9 in a vacuum state, the seal portion 5 and the outer seal portion 8 may have some gap with the outer circumference of the work roll 1a.
Of course, the sealing performance can be maintained.

<Effects of the Invention> As described above, according to the cooling device for a rolling roll of the present invention, a belt or a counter is used as the sealing means between the rolling roll and the sealing portion like the conventional closed type water jacket type roll cooling device. Since a vacuum space is formed on the outside of the seal part for sealing without using a pressing means such as a weight, the sealing performance is greatly improved and it is possible to seal even if the rolling roll is locally worn or roughened. In addition, a high degree of sealing property required for dry rolling can be obtained. Also, even if the rolling roll diameter is different and the cooling water leaks from the seal part, the leaked cooling water is sucked and removed, so there is no need to prepare a roll cooling device for each roll diameter as in the past, and maintenance is not required. The above is also advantageous.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the cooling device of the present invention,
FIG. 2 is a sectional view of the cooling device of FIG. 1 in a direction perpendicular to the axis of the rolling roll. 1a ... work roll, 1b ... backup roll, 2 ... cooling water jacket, 3 ... cooling pad body, 4 ... water supply / drain block, 5 ... seal part, 5a ... seal, 6 ... water supply header, 6a …… Water supply pipe, 7 …… Drainage header, 7a …… Drainage pipe, 8 …… Outside seal part, 9 …… Space, 10 …… Vacuum pipe.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-61-266110 (JP, A) SAIKAI 59-162107 (JP, U)

Claims (1)

[Claims] 1. A cooling water jacket is provided along the outer circumference of the rolling roll so that the cooling water comes into contact with the outer circumference of the rolling roll, and the cooling water jacket forms a seal portion around the portion along the outer circumference of the rolling roll. A closed type water jacket that cools the rolling roll during rolling by supplying the roll cooling water into the cooling water jacket while pressing the seal part on the outer periphery of the rolling roll and recovering the cooling water after cooling the rolling roll. In a cooling device for a rolling roll of a type, an outer sealing part that surrounds the sealing part with a space and forms a space in contact with the outer circumference of the rolling roll is provided, and a suction means that holds the space in vacuum is A rolling roll cooling device characterized by being connected to a space.