JPH0225206A - Cooling device for rolling roll - Google Patents

Abstract

PURPOSE:To prevent the generation of a leakage of cooling water of a rolling roll cooling device by placing a seal part so that it can move forward and backward freely against the surface of a rolling roll, and placing an air tube for energizing the seal part in the projecting direction on a base end side of the seal part. CONSTITUTION:A cooling water jacket 12 is provided along the outside periphery of a rolling roll 10. A seal part 14 is formed along its outside periphery, and the roll 10 is cooled by supplying water into the jacket 12, while pressing said part against the outside periphery of the rolling roll 10, and water is collected. In this case, the seal part 14 is placed so that it moves forward and backward freely against the surface of the rolling roll 10. Also, an air tube 16 for energizing the seal part 14 in the projecting direction is placed on a base end side of the seal part 14. In such a way, the generation of a leakage of cooling water of a rolling roll cooling device can be prevented.

Description

[Detailed description of the invention]

[Industrial Application Field 1] The present invention relates to a cooling device for rolling rolls in a rolling mill, and in particular, a cooling water jacket is provided along the outer periphery of the rolling roll so as to be in contact with the outer periphery of the rolling roll. This invention relates to an improvement in a cooling device for a closed water jacket type rolling mill which cools rolling rolls during rolling by supplying and collecting roll cooling water into the water jacket. BACKGROUND OF THE INVENTION In hot rolling, a large amount of heat flux is generated from the material to be rolled to the rolling rolls during rolling, resulting in rough skin due to thermal fatigue of the rolls and generation of irS on the rolling portions of the rolls. In order to prevent surface flaws and poor flatness caused by these, it is necessary to cool the rolling rolls. Conventionally, mill rolls have been cooled by spraying cooling water onto the surface of the mill roll during rolling, causing the sprayed cooling water to impinge on the roll surface, where heat exchange occurs. This type of spray cooling method not only limits the area where the cooling water comes into contact with the tube, but also increases the amount of cooling water without changing the cooling area, achieving a significant cooling effect. The problem was that it couldn't be done. In addition, the cooling water that is sprayed and collides with the rolling rolls scatters and falls onto the material to be rolled, which lowers the rolling temperature, which wastes a lot of energy and makes it difficult to control the material quality of the material to be rolled. There was a problem with this. In response, a so-called water jacket type roll cooling method has been proposed, which improves cooling efficiency by installing a water jacket along the surface of the rolling roll and supplying cooling water to the water jacket. . In addition, for example, in Japanese Utility Model Application No. 59-162107, a closed cycle is formed in which the cooling water supplied to the water jacket is directly recovered, reducing the amount of cooling water used and discharging the cooling water onto the rolled material after cooling. A system designed to prevent water leakage has been proposed.

[Invention tries to solve! ! Title]

However, when changing the roll diameter to a different roll diameter depending on the material to be rolled, the above-mentioned cooling device has problems with the sealing part of the water jacket in the rolling roll and the above-mentioned cooling device when the roll diameter changes. Since 1liI12Il is generated on the side of the roll and water leaks from there, there is a problem in that the water jacket of the cooling device as described above must be prepared for each rolling roll of different diameter. Further, as a means for pressing the seal portion against the outer periphery of the rolling roll, a belt may be used or
62107, etc., which uses a counterweight, but in this way, the pressing force of the seal portion against the outer periphery of the rolling roll becomes uneven in the axial and circumferential directions of the rolling roll. In this case, there is a problem in that water leaks from areas where the pressing force is weak.

[Purpose of the invention]

This invention was made in view of the above-mentioned conventional problems, and even for rolling rolls with different outer diameters, the sealing portion is pressed uniformly in the axial direction and circumferential direction of the rolling roll, and the water is removed. An object of the present invention is to provide a cooling device for rolling rolls that prevents water leakage from a jacket.

[Means to solve the problem]

In this invention, a cooling water jacket is provided along the outer periphery of the rolling roll so that cold water comes into contact with the outer periphery of the rolling roll, a sealing part is formed along the outer periphery of the cooling water jacket, and the sealing part A closed water jacket type that cools the rolling rolls during rolling by supplying roll cold water into the cooling water jacket while pressing the roller against the outer periphery of the rolling roll, and also recovers the cooling water after cooling the rolling rolls. In the mill roll cooling device, the seal portion is arranged to be movable forward and backward with respect to the surface of the mill roll, and an air tube is arranged on the base end side of the seal portion to bias the seal portion in a projecting direction. This achieves the above objective.

[Operation 1] In the present invention, the seal portion is arranged to be movable forward and backward with respect to the surface of the rolling roll, and the seal portion is urged toward the rolling roller surface from the base end side by the air tube. A uniform pressing force of the seal portion against the outer periphery of the rolling roll can be obtained. Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, as shown in FIGS. 1 to 3, a cooling water jacket 12 is provided along the outer periphery of the rolling roll 10 so that the cooling water comes into contact with the outer periphery of the rolling roll 10. Seal portion 14 along the outer periphery of water jacket 12
The roll cooling water is supplied into the cooling water jacket 12 while pressing the seal portion 14 against the outer periphery of the roll roll 10 to cool the roll roll 10 during rolling, and after cooling the roll roll 10. In a closed water jacket type mill roll cooling device that collects cooling water, the seal portion 14 is disposed so as to be freely movable relative to the surface of the mill roll 10, and the base end of the seal portion 14 is An air tube 16 is placed on the side to urge the seal portion 14 in the protruding direction. The cooling water jacket 12 is composed of a cooling pad main body 18 held by a reference beam (not shown) and a water supply and drainage block 20 attached to the back surface of the cooling pad main body 18. The seal portion 14 is a first seal portion of the cooling pad main body 18.
Upper seal pieces 14A arranged on the upper and lower sides in the figure
and a lower seal piece 14B, and as shown in FIG. is continuously formed into a rectangular cylinder shape. Each of the seal pieces 14A to 14D is made of a heat-resistant and flexible resin material, and as shown in FIG. installed. Here, the upper and lower seal pieces 14 in the seal portion 14
A114B is formed such that its tip is inclined along the cylindrical surface of the rolling roll 10, and the left and right seal pieces 14C,
140 is formed in an arc shape along the circumferential surface of the rolling roll 10. A guide groove 24 is formed along the outer periphery of the end surface of the cooling pad body 18 on the side of the rolling roll 10, and the seal portion 14 is held in the guide groove 24 so as to be able to move forward and backward. Further, a seal presser plate 26 having approximately the same thickness as the seal surrounding metal fitting 22 is fixedly attached to the inner periphery of the guide groove 24 in the cooling pad main body 18 by bolts 28 . The seal presser plate 26 is attached after the seal portion 14 is inserted into the guide groove 24. The air tube 16 is disposed between the bottom of the guide groove 24 and the base end of the seal portion 14 . The length of the seal portion 14 in the forward and backward directions with respect to the rolling roll 10 is set such that when a predetermined air pressure is applied to the air tube 16, the tip portion can be pushed by the air tube 16 and slightly protrude from the guide groove 24. has been done. The air tube 16 is formed in an annular shape, and is supplied with compressed air at a predetermined pressure from a compressed air source 30 via a conduit 32. A pulp 34, an air cleaner 36, and a constant pressure relief valve 38 are arranged in the pipe line 32 from the compressed air source 30 side. A water supply header 40 and a drainage header 42 are formed on the cooling pad main body 18. A water supply pipe 40A is connected to the water supply header 40, and a drainage pipe 42A is connected to the drainage header 42 via the water supply and drainage block 20, and the cooling water is connected to the water supply pipe 40A.
, is supplied to the gap between the cooling pad main body 18 and the rolling roll 10 via the water supply header 40, and the drainage water after the cooling section is finished is
A closed cycle is constructed in which water is drained from the drain header 42 via the drain pipe 42A. Reference numeral 44 in FIG. 1 indicates a backup roll, and 46 indicates a material to be rolled. When cooling the rolling roll 10 with the cooling device described above, compressed air of approximately 0.5 kg/d to 4 kg/C is supplied from the compressed air source 30 through the pipe line 32 into the air tube 16. At the same time, cooling water is supplied to the cooling pad main body 18. In this way, the seal portion 14 is pushed in the protruding direction by the air tubes 16 and 16 and is pressed against the outer circumferential surface of the mill roll 10 . Further, cold water is supplied to the cooling water jacket 12 into the water supply header 40 via the water supply pipe 40A, and the water supply header 4
The cooling water in the cooling pad passes through the gap between the cooling pad main body 18 and the rolling roll 10, reaches the drainage header 42, and is returned from there through the drainage pipe 42A, forming a closed cycle. Since the seal portion 14 is movable in the forward and backward directions within the guide groove 24, even if the outer diameter of the rolling roll 10 changes, it will be moved within the guide groove 24 following this change. or,
At this time, the air tube 16 always presses the rolling roll 1 in the projecting direction, so the rolling roll 1
This means that a water belly can be formed around the outer circumference of 0. Further, since the pressing force of the seal portion 14 by the air tube 16 is uniform, there is very little leakage of cooling water from between the seal portion 14 and the rolling roll 10. Therefore, there is no possibility that water leaks from the cooling water jacket 12 and cools the rolled material 46. In the above embodiment, the seal portion 14 is pressed only against the circumferential surface of the rolling roll 10 to form a seal with the circumferential surface, but the present invention is not limited to this. Instead, for example, the left and right seal pieces may be pressed against the end face in the roll axis direction at the stepped portion of the rolling roll 10 or the outer circumferential surface of the small diameter portion.

【Effect of the invention】

Since this invention is configured as described above, the seal portion of the cooling water jacket can be pressed against the rolling roll surface with uniform force, and therefore, cooling water leakage does not occur due to uneven pressing force of the seal portion. It has this excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a sectional view including a partial block diagram showing an embodiment of a rolling roll cooling device according to the present invention, and FIG.
A sectional view taken along the line -■, and FIG. 3 is an enlarged sectional view showing the seal portion in the same embodiment. DESCRIPTION OF SYMBOLS 10... Rolling roll, 12... Cooling water jacket, 14... Seal part, 16... Air tube, 18... Cooling pad body, 20... Water supply and drainage block, 24... Guide groove , 46... material to be rolled.

Claims (1)

[Claims] (1) A cooling water jacket is provided along the outer periphery of the rolling roll so that the cooling water comes into contact with the outer periphery of the rolling roll, a sealing part is formed along the outer periphery of the cooling water jacket, and the sealing part is rolled. Closed water jacket type rolling roll cooling that cools the rolling roll during rolling by supplying roll cooling water into the cooling water jacket while pressing against the outer periphery of the roll, and collects the cooling water after the rolling roll has been cooled. The apparatus is characterized in that the seal part is arranged to be movable forward and backward with respect to the surface of the rolling roll, and an air tube is arranged on the base end side of the seal part for biasing the seal part in the projecting direction. Rolling roll cooling device.