JPS63199053A - Method and apparatus for continuously casting metal strip - Google Patents

Abstract

PURPOSE:To produce a metal strip under excellent product yield by pouring molten metal at positions contacting with side weirs at end side of a pouring basin part and reducing by remelting projections developed at both end parts of the strip carried out from the pouring basin part. CONSTITUTION:At the time of pouring the molten metal 8 into the pouring basin part 4 formed toward width direction of a running belt 1 from pouring device 7, the molten metal 8 is cooled and solidified on the belt 1, to develop solidified shell 10 and become the strip together with moving of the belt 1 and carry out from the pouring basin 4. Then, the projection 15 in the solidified shell 10 is formed along inner wall of the side weirs 5. As the high temp. molten metal 8a from the pouring device 7 is poured at the positions sticking out from both end parts of solidified shell 10, by growing into the large projections 15, the projections 15 are remelted by holding heat of the molten metal 8a and both end parts of the solidified shell 10 are flattened. By rolling this flattened strip, the metal strip having excellent quality is produced at high yield.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method and apparatus for continuously producing metal ribbons such as copper strips by cooling and solidifying molten metal on a running belt.

[Conventional technology]

Recently, a number l1lI that is close to the final shape from molten metal such as molten steel
Continuous casting methods that directly produce thin strips with a thickness of about 11 mm are attracting attention. When this method is used, the hot rolling process can be simplified or omitted, and the rolling required to obtain the final shape can be done only lightly, so that the process and equipment can be simplified.

A belt method is one of such continuous casting methods for metal ribbon. In this method, for example, a pool is formed on a belt that runs endlessly, and the molten metal poured into the pool is cooled and solidified by heat removal through the belt, and the resulting shell is released as the belt runs. The molten metal is then sent out from the pool to produce metal ribbon. At this time, the molten metal is cooled from one direction, and the surface opposite to the belt is open. Therefore, there are fewer restrictions on the arrangement of nozzles that supply molten metal from a container such as a tundish to a pool on the belt.

The inventors of the present invention have developed a casting device using this belt method in which the weir that partitions the side surface of the basin can be moved, and has filed an application for this as Japanese Patent Application No. 155247/1983.

FIG. 3 shows the device proposed in this earlier application.

In this device, a metal belt 1 is connected to a pair of boots.
J2a and 2b have been given a hook and are designed to run on endless tracks. Then, by holding one pulley 2a high, the endless trajectory of Bell
It will rise towards 2a.

A plurality of heat-resistant blocks 3 connected by chains or the like are arranged around the bell (1), and these heat-resistant blocks 3 move in synchronization with the running of the belt 1.

The heat-resistant block 3 serves as a side weir 5 that partitions the side of the sump 4 at the upper portion where the belt 1 runs linearly. On the other hand, a fixed weir 6 is provided at the rear of the water reservoir 4. As a result, a trough portion 4 is formed that is open only in the direction in which the belt 1 moves.

Molten metal 8 is poured into this pool 4 from a pouring device t7.

The poured molten metal 8 is heated by a cooling device 9 disposed on the back side of the belt 1, cooled and solidified, and becomes a solidified shell 10. This solidified shell 10 is conveyed rightward in FIG. 3 as the belt 1 moves. As heat continues to be removed during this transportation process, the solidified shell lO
grows into a thin ribbon 11 having a predetermined thickness, and is sent out from the pool 4.

This thin strip 11 is then rolled to a target thickness by a pressure roll 12, and a thin coil 14 is rolled by a winding device 13.
It is wound up as. Note that the pressure roll 12 can also be operated to perform processing to adjust the surface properties of the ribbon 11 without causing any substantial variation in the thickness.

[Problem that the invention seeks to solve]

When the molten metal 8 is solidified on the bell 1 in this manner, heat is radiated from the portions of the solidified shell 10 that contact the side weirs 5 at both ends. For this reason, as shown in FIG. 4, an ear 15 that rises from the solidified shell 10 grows along the inner wall of the side weir 5. When the solidified shell 10 having the ears 15 is rolled into a product in the final process, since the processing rate at the ears 15 is different, defects such as rolling bottoms, cracks, unevenness, etc. are likely to occur at both ends of the product. .

In order to avoid the occurrence of this ear 150, it is conceivable to line the side weir 5 on the side of the pool 4 with a heat insulating refractory material 16 such as alumina or silica. However, even with a heat insulating refractory 16 lining, lateral heat radiation at both ends cannot be completely eliminated, and the occurrence of ears 15 cannot be completely avoided.

Therefore, it is necessary to cut off the generated ears 15 prior to rolling, but this reduces the product yield.

Therefore, the present invention reduces the ears at both ends of the ribbon that is carried out from the pool by remelting the ears generated by the additionally injected molten metal, and manufactures the metal ribbon with an excellent product yield. The purpose is to

[Means for solving problems]

In order to achieve the object, the continuous casting method of the present invention cools and solidifies molten metal poured into a pool formed in the width direction of a running belt to produce a metal ribbon. , characterized in that molten metal is injected into the tip side of the tundish portion in contact with the side weir.

In addition, a continuous casting device that implements this method has side weirs on both sides of the running belt, and injects molten metal into the tip of a pool section divided by the side weirs and at a location in contact with the side weirs. The present invention is characterized in that a nozzle is provided branching off from a pouring device that pours molten metal into the molten metal reservoir.

[Example] Hereinafter, the features of the present invention will be specifically explained using examples with reference to the drawings.

FIG. 1 shows the additional injection of molten metal into the ear according to the invention, and FIG. 2 shows an example of a pouring device used for this injection. On the right, in these figures, the third
Components corresponding to those shown in the figures and FIG. 4 are indicated by the same reference numerals, and their explanations are omitted.

In this embodiment, the molten metal 8 is placed at the location where the ears 15 grow and stand up from both ends of the solidified shell lO.
Injecting a. The molten metal in the pouring device 7 is heated to a high temperature above the liquidus line, and is in a state where there is a difference between the temperature and the melting point, that is, a degree of superheat. Due to the heat retained by this molten metal, the ears 15 are remelted and the solidified shell 100 is
Both ends are flattened.

The additionally injected molten metal 8a is as shown in FIG.
Pipe line 17 equipped with a flow rate adjustment valve (not shown) as required
is attached to the pouring device 7, and is carried out through a nozzle 18 attached to the tip of the conduit 17. This nozzle 18 is directed toward ears 15 that have grown along the inner wall of the side weir 5 at both ends of the solidified shell 10, as shown in FIG.

In the example shown in FIG. 2, a pair of nozzles 18 are provided at one location along the running direction of the belt 1, but the nozzles 18 may be provided at multiple locations along the running direction of the belt 1 without being restricted by this. It is possible. By injecting the molten metal 8a according to the degree of growth of the ears 15, the occurrence of abnormal ears 15 is suppressed. In addition, when injecting the molten metal 8a in multiple stages like this, the ear 1 is injected in a small amount as a whole.
5 can be remelted, the effect on the molten metal in the sump 4 is also small.

Further, the injection position P2 of the molten gold X8a is a drawer position P where the solidified shell 10 is carried out from the molten metal sump 4.

When the distance from to the fixed weir 6 is L, the solidified shell 1
It is preferable to take the range from 0.1 to 0.6XL from the drawer position P1 of 0. Distance between position P and ~P2.

When is within this range, the selvage 15 can be remelted without essentially affecting the molten metal in the tundish basin 4 and the solidified shell 10 carried out from the tundish basin 4. If the distance L1 between the positions P1 and P2 is less than 0.1XL, the injected molten metal 8a will be taken out of the sump 4 as the solidified shell 10 is carried out, and the parts of both ends of the solidified shell 10 will be partially removed. This may cause melting, surface roughening, etc. Furthermore, when the distance L+ between the positions P and ~P2 exceeds 0.6XL and approaches the fixed weir 6 side, the injection effect of the molten metal 8a decreases, and the stirring of the sump 4 increases, causing the solidification shell 10 to Growth becomes unstable.

Next, the effects of the present invention will be specifically explained using actual operating conditions.

130kg of molten steel with a common steel composition and a temperature of 1585℃
The molten metal 8 was poured into the pool 4 having a width of 300 cm at a flow rate of /min. At this time, the distance from the fixed weir 6 to the pull-out position P1 of the solidified shell 10 was 800 mm.

Then, using the pouring device 7 shown in FIG.
The molten metal 8a was additionally injected at a flow rate of 50 kg/min.

Under these conditions, the wall thickness was 7In at the unloading speed of 12m/min.
A ribbon 11 of I11 was produced. Both ends of the obtained ribbon 11 were only 21% thicker than the center. On the other hand, ears 15 with a height of 40 m were formed in the ribbon 11 obtained without additional injection of the molten metal 8a.

In addition, although the apparatus equipped with the side 1@5 which was made into a movable type was demonstrated above, as the side weir 5, a fixed type can also be used without being restricted by this.

〔Effect of the invention〕

As explained above, in the present invention, the molten metal in the pool is remelted by additionally injecting the molten metal into the ear formed at the location where it contacts the inner wall of the side weir. Therefore, the obtained ribbon has both ends without ears or the like. Therefore, when this ribbon is rolled into a product, defects such as rolling bottoms and cracks do not occur at both ends, and the ribbon can be manufactured with a high yield. In this way, the present invention has made it possible to efficiently produce a metal ribbon of excellent quality.

[Brief explanation of the drawing]

FIG. 1 shows a state in which molten metal is additionally injected into ears formed at both ends of a solidified shell in an embodiment of the present invention,
FIG. 2 shows an example of a pouring device used for this purpose. On the other hand, FIG. 3 shows a continuous casting apparatus separately developed by the present inventors, and FIG. 4 is a diagram illustrating a situation in which stubble occurs in the apparatus.

Claims (1)

[Claims] 1. When manufacturing a metal ribbon by cooling and solidifying molten metal poured into a pool formed in the width direction of a running belt, the tip of the pool A method for continuous casting of metal ribbon, characterized by injecting molten metal into the part where the side contacts the side weir. 2. Side weirs are provided on both sides of the running belt, and a nozzle for injecting molten metal is installed at the tip of the pool defined by the side weir and in contact with the side weir. 1. A continuous casting device for thin metal ribbon, characterized in that it is provided branching off from a pouring device for injecting molten metal.