JPH01321004A - Method for cooling control for rolling roll - Google Patents

Abstract

PURPOSE:To perform cooling control for rolling rolls by a prescribed cooling capacity in spite of variations in a water film thickness by detecting surface temps. of rolling rolls and adjusting volume of a cooling water supplied to cooling water jackets. CONSTITUTION:Surface temps. of rolling work rolls 2 detected by temp. measuring means 4 and shown on a temp. indication panel 10 are monitored by an operator; the operator adjusts a variable throttle valve 7 to control volume of a water supply with the operator watching a flow meter 9. As the result, the roll surface temps. of the rolls 2 during rolling are properly controlled. The operational efficiency is improved because setting a water film thickness is not needed to be so severe.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for controlling cooling of a rolling roll, and more specifically, the present invention relates to a cooling control method for a rolling roll, and more specifically, a cooling water jacket shaped along the outer peripheral face of the rolling roll is connected to the outer peripheral face of the rolling roll. The present invention relates to a cooling control method for a mill roll in a method in which the mill roll is cooled by forming a water film in the gap between the mill roll and a cooling water jacket.

<Prior art> Conventionally, rolling work rolls are cooled by spraying cooling water onto the surface of the rolling work roll during rolling, and the sprayed cooling water collides with the roll surface, where heat exchange occurs. It was being done.

With this type of spray-type roll cooling method, the area that the chilled water contacts the rolls is limited, and even if the amount of cooling water is increased, the cooling area does not change, making it impossible to achieve a significant increase in the cooling effect. There was a problem. In addition, the cooling water that is sprayed and collides with the rolling rolls scatters and falls onto the material being rolled, reducing the rolling temperature, which wastes a lot of energy and makes it difficult to control the material quality of the material being rolled. There was a problem.

As a countermeasure to these problems in the spray-type roll cooling method, for example, as shown in Japanese Patent Publication No. 55-12322, a cooling water jacket is arranged along the outer peripheral surface of the rolling roll, and the cooling water jacket is used to cool the roll. A so-called cooling water jacket type roll cooling method has been proposed in which the roll cooling capacity is improved by supplying water.

Furthermore, as proposed in, for example, Japanese Utility Model Application Publication No. 59-162107, a closed cycle is formed in which the cooling water supplied to the cooling water jacket is directly recovered, thereby reducing the amount of cooling water used and Some systems are designed to prevent cooling water from leaking onto the rolled material.

In the method of cooling the rolling roll by forming a water film in the gap between the rolling roll and the cooling water jacket using such a cooling water jacket, as shown in Fig. 4, the roll cooling is controlled by the thickness of the water film and the amount of water supplied. It was found that the capacity varied widely, and therefore it became clear that in order to maintain a constant mill roll cooling capacity, it was necessary to maintain the water film at a predetermined thickness.

<Problems to be Solved by the Invention> However, in order to set the water film to the target thickness, the adjustment of the gap between the rolling roll and the cooling water jacket is complicated, and it requires a lot of effort. There was a problem.

In addition, the surface of rolling rolls becomes rough and damaged with use, so the surface is repeatedly ground, so the roll diameter may change.
In addition, since the gap between the rolling roll and the cooling water jacket is sealed, it is impossible to measure the actual thickness of the water film. There was a problem in that the rolls could not be cooled properly.

An object of the present invention is to provide a cooling control method for a rolling roll that solves the above problems.

<LIiJ! Means for Solving> A first invention provides a cooling water jacket having a shape along the outer circumferential surface of a rolling roll, and disposing a cooling water jacket facing the outer circumferential surface of the rolling roll, and disposing a cooling water jacket in a gap between the rolling roll and the cooling water jacket. In the method of cooling the rolling roll by forming a water film, the rolling roll is cooled by detecting the surface temperature of the rolling roll and adjusting the amount of cooling water supplied to the cooling water jacket according to the surface temperature. This controls the surface temperature of the roll.

Further, in a second invention, a cooling water jacket having a shape along the outer peripheral surface of the rolling roll is disposed opposite to the outer peripheral surface of the rolling roll, and a water belly is formed in a gap between the rolling roll and the cooling water jacket. In the method of cooling the mill roll by detecting the temperature of the outer peripheral surface of the mill roll and adjusting the temperature of the cooling water supplied to the cooling water jacket according to the surface temperature, the surface of the mill roll is cooled. It controls the temperature.

<Function> In the first invention, by detecting the surface temperature of the rolling roll and adjusting the amount of cooling water supplied to the cooling water jacket according to the surface temperature of the rolling roll, and in the second invention, By detecting the surface temperature of the rolling roll and adjusting the temperature of the cooling water supplied to the cooling water jacket according to the surface temperature of the rolling roll, it is possible to eliminate the need to set the thickness of the water film strictly or to reduce the water film thickness. Even if an error occurs in the thickness of the roll, the surface temperature of the rolling roll can be appropriately controlled.

<Example> An embodiment of the present invention will be described based on the drawings.

FIG. 1 is an overall configuration diagram of an embodiment of the first invention.
In the figure, l is a material to be rolled, and 2 is a rolling work roll. Reference numeral 3 denotes a water cooling jacket disposed opposite the outer peripheral surface of the rolling work roll 2, and a water film is formed in the gap between the rolling work roll 2 and the water cooling jacket 3. 4 is a temperature measuring means for measuring the surface temperature of the rolling work roll; 5 is a water supply pipe; 6
1 is a drainage pipe, 7 is a variable throttle valve provided in the water supply pipe 5, 8 is a boost pump, 9 is a cooling water flow rate needle, 10 is a surface temperature display panel for the rolling work roll, and 13 is a water supply and drainage tank.

Therefore, the operator monitors the surface temperature of the rolling work roll 2 detected by the temperature measuring means 4 on the temperature display panel 10, and adjusts the variable throttle valve 7 while looking at the flow meter 9 to control the water supply amount. Accordingly, the roll surface temperature of the rolling work roll 2 during rolling can be appropriately controlled.

Further, FIG. 2 shows another embodiment of the first invention, and while the first embodiment requires an operator, this embodiment adopts an automatic control system. be. In FIG. 2, reference numeral 15 is a microcomputer that calculates the amount of cooling water and the opening degree of the variable throttle valve 7 according to the surface temperature of the rolling work roll 2 detected by the temperature detection means 4.

Reference numeral 16 denotes a motor that opens and closes the variable throttle valve 7 in accordance with the calculated opening value of the variable throttle valve 7 given by the microcomputer 15 .

Next, FIG. 3 is an overall configuration diagram of an embodiment of the second invention. In FIG. 3, the same parts as in FIG. 1 are given the same numbers, 7A, 7. is a variable throttle valve provided in the water supply pipe 5, 8A and +31 are booster pumps, and 9a and 9g are cooling water flowmeters. 11 is a chiller unit for lowering the temperature of the water supply, 12 is a water supply thermometer, and 14 is a low temperature water tank for storing low temperature water.

Thus, the operator monitors the temperature of the rolling work roll 2 measured by the temperature measuring means 4 on the temperature display panel 10, and while looking at the feed water thermometer 12, the variable throttle valve 7. ．． ? .

By controlling the cooling water temperature by controlling the cooling water temperature, it is possible to appropriately control the roll surface temperature of the rolling work roll 2 during rolling.

<Effects of the Invention> As explained above, the present invention is capable of controlling the cooling of the rolling roll at a predetermined cooling capacity even if the thickness of the water film between the cooling water jacket and the outer peripheral surface of the rolling roll changes. In addition, there is no longer a need to strictly set the water film thickness, which was time-consuming in the past, so work efficiency can be improved, and the life of the rolling roll can be extended. play.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing one embodiment of the first invention;
Figure 3 is an overall configuration diagram showing another embodiment of the first invention, Figure 3 is an overall configuration diagram showing an embodiment of the second invention, and Figure 4 is the relationship between the water film, the amount of water supplied, and the roll cooling capacity. This is a graph showing. 1... Rolled material, 2... Rolling work roll, 3
...Cooling water jacket, 4.Temperature measuring means, 5.Water supply piping, 6..
Drainage piping, 7... Variable throttle valve, 8... Boost pump, 9... Flow meter, IO... Roll surface temperature display panel, ■! ... Chiller unit, 12 ... Water supply thermometer, 1
3... Water supply and drainage tank, 14... Low temperature water tank, 1
5...Microcomputer, 16...Motor. Patent Applicant: Kawasaki Steel Corporation No. L Co., Ltd. Figure 2 Figure 3

Claims (2)

[Claims] (1) A cooling water jacket having a shape along the outer peripheral surface of the rolling roll is disposed opposite to the outer peripheral surface of the rolling roll, and a water film is formed in the gap between the rolling roll and the cooling water jacket to cool the rolling roll. The cooling method is characterized in that the surface temperature of the rolling roll is controlled by detecting the surface temperature of the rolling roll and adjusting the amount of cooling water supplied to the cooling water jacket according to the surface temperature. A cooling control method for rolling rolls. (2) A cooling water jacket having a shape along the outer peripheral surface of the rolling roll is arranged opposite to the outer peripheral surface of the rolling roll, and a water film is formed in the gap between the rolling roll and the cooling water jacket to form a water film on the rolling roll. In the method for cooling the roll, the surface temperature of the roll is controlled by detecting the temperature of the outer peripheral surface of the roll and adjusting the temperature of the cooling water supplied to the cooling water jacket according to the surface temperature. A method for controlling cooling of a rolling roll, characterized in that: