JPH02151350A - Apparatus and method for cooling roll in roll type continuous casting machine - Google Patents

Abstract

PURPOSE:To improve cooling capacity and to stably cast a plate having good shape at high velocity by indirectly executing cooling of rolls through belts contacting with the outer circumferential faces of the rolls. CONSTITUTION:The belts 6a, 6b are brought into contact with the rolls 1a, 1b with guide rolls 7a, 7b, 8a, 8b. In order to give the prescribed tension to the belts 6a, 6b, the tension is developed to the belts 6a, 6b with temsioner 10a, 10b and the belts are driven while matching with rotation of the casting rolls 1a, 1b with rolls 11a, 11b for driving. In inner part contacting the belts 6a, 6b with the casting rolls 1a, 1b, the cooling devices 12a, 12b are set to execute cooling to the inner faces of the belts and conduction of heat from the surface of the temp. raised casting rolls 1a, 1b while sandwiching the belts. Therefore, the casting rolls 1a, 1b can be cooled from outer part without directly contacting with coolant.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a roll cooling device and method for a roll-type continuous casting machine, and in particular to a roll cooling device and method for a roll type continuous casting machine. The present invention relates to a cooling device and method.

[Conventional technology]

Roll type continuous casting Ja (hereinafter referred to as roll type continuous casting machine)
In this method, the molten metal is directly cooled by rolls to produce thin plates at once.If the rolls are not cooled, the temperature of the rolls will rise, making it impossible to cool the slab, and the drum will develop a crown due to thermal expansion. Phenomena such as cracking occur due to thermal stress. For this reason, conventionally, as a method of suppressing the temperature rise of the drum, as described in Japanese Patent Application Laid-open No. 58-359, an internal cooling technique in which the roll is constructed with a thin sleeve and the sleeve is cooled from inside with a cooling liquid has been proposed. Ya, Japanese Unexamined Patent Application Publication No. 1983-
As described in No. 33059, an external cooling technique has been used in which cooling water is directly injected onto the outer surface of the drum to cool the roll surface.

C Problems to be Solved by the Invention] However, in the internal cooling technology in which the roll is configured with a thin sleeve and cooled from the inside, the temperature of the sleeve increases and the temperature rises between the outside of the sleeve in contact with the molten steel and the inside of the sleeve in contact with the cooling liquid. There was a problem in that the rolls tended to expand into a barrel shape due to the temperature distribution between them.

In addition, with technology that cools the roll by spraying cooling water directly onto the outer surface of the roll, it is difficult to completely remove the cooling water adhering to the roll, and the cooling water flows into the molten metal pool, causing moisture to vaporize and surface the molten metal. This increases the amount of splash from the molten metal, which falls and adheres to the roll surface, causing roughening of the surface of the slab, or if a large amount of moisture remains, the molten metal is blown upwards, making safe operation impossible. Due to this problem, it has not been put into practical use.

The purpose of the present invention is to increase the cooling capacity of a roll-type continuous casting machine by using a roll external cooling device that prevents cooling water from directly adhering to the roll surface, thereby increasing the cooling capacity and producing plates of good shape at high speed and stably. An object of the present invention is to provide a roll cooling device and method for a continuous roll casting machine that can perform casting.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a roll cooling device for an A-R type continuous casting machine that is equipped with a pair of opposing rolls that cool molten metal to form a slab, and that cools the rolls. an endless belt that partially contacts a portion of the outer circumferential surface of the pair of opposing rolls; a belt pressing means that presses the belt against the roll; The invention is characterized in that it is equipped with a belt cooling means for cooling the air, and is characterized in that it is combined with an internal cooling roll.

Further, in a roll cooling method for a roll-type continuous casting machine, which includes a pair of opposing rolls that cool molten metal to form a slab, and cools the rolls.

The outer circumferential surface of an endless belt is brought into contact with a part of the outer circumferential surface of the pair of opposing rolls, and from the inside of the belt,
This method is characterized in that the cooling liquid cools the roll indirectly without contacting the roll.

[Effect]

According to the above configuration, cooling of the roll is performed indirectly via the belt that contacts the outer peripheral surface of the roll.

Therefore, the cooling liquid and the like do not come into direct contact with the molten steel.

〔Example〕

The present invention will be explained below with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of the roll cooling device of the present invention, in which a pair of casting rolls la and lb are arranged horizontally opposite each other with an appropriate gap, a molten steel dam 2 stores molten flII3, and the molten steel fl The rolls la and lb are driven to rotate in opposite directions at the same speed. Molten steel 3 in contact with rolls la and lb is cooled by the rolls and becomes a solidified shell 4, which gradually grows and is sent out as a thin steel plate 5. roll la, l
The temperature of b increases due to heat input from the molten steel.

The present invention is carried out as follows to cool the heated rolls in order to cool the molten steel 3 and form a slab.

The belts 6a, 6b are connected to guide rolls 7a, 7b.

8a and 8b are brought into contact with rolls la and lb. belt 6
In order to apply a predetermined tension to belts a and 6b, tension rolls 9a and 9b are used.Tension rollers 10a and 10b generate tension in belts 6a and 6b, and belt driving rolls lla and llb cause casting rolls la and lb to be applied. It moves instantly according to the rotation of.

Cooling bags BW12a, 12b are installed inside the contact areas between the belts 6a, 6b and the casting rolls la, lb, and cool the inner surfaces of the belts, sandwiching the belts from the surfaces of the heated casting rolls 1a, lb. 6 Cooling device 1 for removing heat
The sides of 2a and 12b are side plates.

It is sealed by 13a and 13b. Therefore, the casting roll la
, lb can be cooled from the outside without direct contact with the cooling fluid. Especially the coolant and roll la.

Since 1b does not come in direct contact with the steel, there is no molten steel blowing up due to the inflow of the coolant, and safe operation is possible.

As the speed of continuous roll casting machines increases and slabs become thinner, improvements in cooling capacity and dimensional accuracy of the plates are desired.
In Fig. 1, in the internal cooling technology in which the surfaces of rolls la and lb are constructed with thin sleeves 14 and the sleeves are cooled with cooling liquid flowing through slits 15 provided inside, the temperature distribution from the inner surface to the outer surface of the sleeve is is the fourth point before contact with molten steel.
As shown in the figure, the temperature increases from the inner surface to the outer surface. This temperature distribution becomes even more pronounced when it comes into contact with molten steel, causing the sleeve to swell into a barrel shape, resulting in a concave crown shape for the slab, which deteriorates dimensional accuracy. In order to improve this temperature distribution, it is necessary to use external cooling technology, but this has not been done so far because external cooling is difficult.

FIG. 1 of this embodiment shows an example in which an internal cooling roll is combined with an external cooling device, and by combining the internal cooling roll and external cooling method in this way, it is possible to improve the cooling capacity of the roll, and As shown in FIG. 5, the temperature distribution of the sleeve can be flattened by lowering the outer surface temperature. This has the effect of reducing the temperature rise of the sleeve and the crowning of the internal cooling roll caused by the temperature distribution in the thickness direction of the sleeve.

During continuous casting, the temperature at the center in the width direction of the roll tends to rise, which also deteriorates the slab dimensions. FIG. 2 is a view taken along the line A-A in FIG. 1, showing the guide roll 7a.

By attaching a convex crown to 8a, the belt can be strongly cooled at the center in the roll width direction, and the temperature distribution in the width direction can be made uniform. By doing so, there is an effect of reducing the crown of the I4 forming roll.

FIG. 3 is a view taken along the line B--B in FIG. 1. The cooling flow path of the cooling device 12a inside the belt is connected to the partition wall 16a.

The roll is divided in the roll width direction by 16b and 16c, and nozzles 17a, 17b, 17c, and 17d and headers 18a, 18b, 18c, and 18d are provided respectively. The temperature of the roll surface is measured with a plurality of thermometer groups 19a and 19b installed in the roll width direction, and the temperature is made uniform.
The coolant sucked up by the pump 21 from the water tank 2o is transferred to the distributor 2
2 to each channel. This makes it possible to make the temperature distribution uniform in the width direction of the plate.

Furthermore, even when casting slabs with different widths using the same roll, the cooling area can be set according to the width, so effective cooling can be achieved. Note that 23a and 23b are drain ports.

〔Effect of the invention〕

According to the present invention, in the external cooling of the rolls of a roll-type continuous casting machine, since the cooling liquid does not come into direct contact with the rolls, stable external cooling can be achieved without causing operational problems due to the cooling liquid entering the molten steel pool. This makes it possible to achieve external cooling, which has been difficult until now.

In addition, by combining this method with an internal cooling method, there are effects such as increasing the manufacturing speed due to improved cooling capacity and improving plate accuracy due to improved sleeve temperature distribution.

[Brief explanation of the drawing]

Fig. 1 is a front view of a twin roll continuous casting machine which is an embodiment of the present invention, and Fig. 2 is a front view of a twin roll continuous casting machine which is an embodiment of the present invention.
Figure 3 is a view taken along the arrow A-A in the figure, Figure 3 is a view taken along the line B-B in Figure 1 where the flow path of the cooling device is divided by partition walls in the width direction, and Figure 4 is the view taken in the thickness direction of the sleeve of the internal cooling roll. Temperature Distribution Graph FIG. 5 is a temperature distribution graph in the thickness direction of the sleeve when external cooling is applied to the internal cooling roll. la, lb...casting roll, 3...molten steel, 6a, 6b...belt, 7a, 7b, 8a, 8b-=guide roll. 9a, 9b... Tension roll, 10a, 10b... Tension roller 11a, llb... Drive roll, 12a, 12b - Cooling device. 13a, 13b-side plate, 14...roll sleeve, 15...cooling groove, 23a, 23b...drain port.

Claims (1)

[Claims] 1. A roll cooling device for a roll-type continuous casting machine that is equipped with a pair of opposing rolls that cool molten metal to form a slab, and that cools the rolls. An endless belt that partially contacts a portion of the outer peripheral surface of the roll, a belt pressing means that presses the belt against the roll, and a belt cooling means that cools the roll through the belt inside the belt. A roll cooling device for a roll type continuous casting machine, characterized by comprising: 2. In a roll cooling device for a roll-type continuous casting machine that is equipped with a pair of opposing rolls that cool molten metal to form a slab, and that cools the rolls, one of the outer circumferential surfaces of the opposing pair of rolls is provided. An endless belt having a part in contact with each part, a belt pressing means for pressing the belt against the roll, and a belt cooling means for cooling the roll via the belt inside the belt. A roll cooling device for a roll type continuous casting machine, characterized in that a belt means is combined with an internal cooling roll having a cooling means inside the roll. 3. In a roll cooling method for a roll-type continuous casting machine that is equipped with a pair of opposing rolls that cool molten metal to form a slab, one of the outer circumferential surfaces of the pair of opposing rolls is cooled. 1. A method for cooling rolls in a roll-type continuous casting machine, characterized in that the outer circumferential surface of an endless belt is brought into contact with the belt, and a cooling liquid from inside the belt cools the roll indirectly without contacting the roll. 4. The roll cooling device according to claim 1 or 2, further comprising a side plate that sandwiches the belt between a part of the outer peripheral surface of the roll and the belt cooling means and closes a side surface of the endless belt. A roll cooling device for a roll-type continuous casting machine. 5. The roll cooling device according to claim 1 or 2, wherein the belt pressing means includes a tension roll including a guide roll and a tension applying means, and a belt driving roll, which are configured inside the endless belt. A roll cooling device for a roll type continuous casting machine, characterized in that: 6. The roll cooling device for a roll type continuous casting machine according to claim 5, wherein at least one of the guide rolls is provided with a convex crown. 7. The roll cooling device according to claim 1, 2 or 4, wherein the belt cooling means is a continuous roll cooling device, characterized in that the belt cooling means has a cooling liquid flow path along the inner peripheral surface of the belt in contact with the roll. Casting machine roll cooling system. 8. The roll cooling device for a roll type continuous casting machine according to claim 7, wherein the flow path for the cooling liquid is divided by partition walls in the width direction of the roll. 9. The roll cooling device according to claim 1, 2, 4, or 7, characterized in that the belt cooling means is provided with a cooling adjustment means for making cooling of the roll variable in the width direction of the roll. Roll cooling device for roll type continuous casting machine. 10. The roll cooling device according to claim 9, wherein the cooling adjustment means includes a temperature detector provided in the width direction of the roll to detect the temperature in the width direction of the roll, and controls the cooling of the roll based on the output of the temperature detector. A roll cooling device for a roll type continuous casting machine, characterized in that it adjusts.