JPS6127149A - Horizontal and continuous casting device - Google Patents

Abstract

PURPOSE:To produce a good unidirectionally solidified casting by consisting in providing a build-up part to the upper traveling part of an endless belt to form a gate for holding a molten metal and supporting the gate part of the build-up part with plural electromagnetic rolls. CONSTITUTION:A casting device 1 is provided with a rotary drum 3 at a level higher than the level of drums 4-6 and is formed with the build-up part 8 in part of the upper traveling part 7 of the endless belt 2. Electromagnetic rolls 9 for sucking the belt 2 are disposed below the drum 3 and oscillating means are provided between the rolls 9. Means for forming side walls are provided on both sides of the part 7. A nozzle 17 of a means 14 for supplying the molten metal is immersed into the molten metal layer 13 in the casting mold and the bottom surface of the layer 13 is cooled by cooling means consisting of water cooling nozzles 24 between backup rolls 10. The formation of the solidified shell of the molten metal near the bottom of the gate behind the build-up part of the endless belt is thus prevented and the good unidirectionally solidified casting is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application: The present invention relates to a horizontal continuous casting method and an apparatus therefor, and more specifically, while continuously transporting a molten metal layer in an approximately horizontal direction, only the lower surface of the molten metal layer is cast. The present invention relates to a horizontal continuous casting method and apparatus thereof, in which the molten metal layer is cooled and unidirectionally solidified from the bottom surface to the top surface of the molten metal layer.

Prior Art Center In order to obtain a vertical and short steel ingot with good internal quality and no segregation, the lower surface of the molten metal layer is continuously transferred at an upward inclination angle of 10° or less with respect to the horizontal direction. A horizontal continuous casting method and apparatus for unidirectionally solidifying the molten metal layer from the bottom surface to the top surface by cooling only the molten metal layer have already been proposed. For example, it is disclosed in Japanese Patent Application No. 57-157794.

Such horizontal continuous casting equipment supports the molten metal layer and continuously transports it at an upward slope angle of 10° or less with respect to the horizontal direction in order to easily control the thickness of the molten metal layer. an endless belt for cooling, side wall forming means provided on both sides of the upper running section of the endless belt to form a mold together with the endless belt, and a cooling tank for cooling the upper running section of the endless belt. Weir means are provided upstream of the flow of the molten metal layer for retaining the molten metal layer within the mold.

According to such horizontal continuous casting equipment, the molten metal layer on the endless belt is cooled only at its bottom surface, so that the molten metal layer undergoes unidirectional solidification from its bottom surface to its top surface, thereby eliminating center segregation. This results in a vertically short steel ingot with good internal quality.

Incidentally, in such a horizontal continuous casting apparatus, the weir means is formed as a block made of refractory material, and the block is kept in close contact with the upper running part of the endless belt to prevent leakage of molten metal ( That is, they are slid so that the gap therebetween is 0.1 mm or less. For this reason, the molten metal anti-seize agent such as carbon powder applied to the surface of the endless belt may be scraped off, causing a seizing accident or damaging the front surface of the endless belt. In this case, continuous operation for long periods of time was considered impossible.

Therefore, in order to solve such a problem, the upper running part of the endless belt is raised upstream from the molten metal supply means to a height higher than the upper surface of the molten metal layer, and the raised part forms a dam. has been proposed, and such a horizontal continuous casting apparatus is disclosed, for example, in Japanese Utility Model Application No. 194963/1983.

In the horizontal continuous casting apparatus disclosed in Utility Model Application No. 57-194963, a large-diameter rotating drum is provided on one side, that is, the upstream side, of a pack-a-roll group that supports the upper running part of the endless belt, and the other side is provided with a large-diameter rotating drum. A small-diameter rotating drum is provided on the downstream side. That is, the endless belt is passed between large-diameter and small-diameter rotating drums arranged on both sides of the pack-a-roll group. As mentioned above, in order to raise the upper running part of the endless belt to form a weir, a belt support is provided above the large-diameter rotating drum along the arc of the rotating drum. As a result, the endless belt is forcibly moved along its arc above the large-diameter rotating drum. In other words, the part of the endless belt that is forcibly moved along the upper arc of the large-diameter rotating drum becomes an arcuate ridge, and the downstream side of the ridge forms a weir. will be done.

Problems to be Solved by the Invention With the horizontal continuous casting apparatus disclosed in Japanese Utility Model Application No. 1949-1983, there is no need to use blocks made of refractory material. The problems described for continuous casting equipment will be eliminated. However, when trying to implement the horizontal continuous casting apparatus of Utility Model Application No. 57-194963, the following problem was encountered.

In other words, in order to forcibly move the endless belt along the upper arc of the large-diameter rotating drum, the running of the endless belt must be regulated by a belt support against the tension applied thereto. However, due to such regulations, the smooth running of the endless belt is impaired.

Therefore, the main object of the present invention is to provide a horizontal continuous casting apparatus of the above type, in which the upper running portion of the endless belt is disposed of in a manner upstream of the molten metal supply means, without impairing the smooth running of the endless belt. It is an object of the present invention to provide a horizontal continuous casting device capable of forming a weir by elevating the weir to a height higher than the upper surface of the weir.

On the other hand, in the conventional horizontal continuous casting apparatus as described above, the solidified shell of the molten metal is formed near the bottom of the weir means provided upstream of the upper running part of the endless belt to hold the molten metal layer in the mold. It is always a problem that it is easy to form. This is because if such a molten metal solidification shell is formed, the unidirectional solidification of the molten metal layer from the bottom surface to the top surface will not occur uniformly, which will adversely affect the quality of the cast product.

Therefore, another object of the present invention is a horizontal continuous casting apparatus for achieving the above-mentioned Saturday and Sunday, forming a molten metal solidified shell near the bottom of the weir formed by the ridge of the upper running part of the endless belt. It is an object of the present invention to provide a horizontal continuous casting device configured to prevent or prevent the above.

Means for Solving the Problems The present invention provides a unidirectional solidification horizontal continuous casting apparatus of the type described above, in which the upper running part of the endless belt forming the bottom part of the mold is adapted to hold the isomeltable metal layer in the mold. In order to form a weir, a raised part is provided on the upstream side of the molten metal supply means and raised to a height higher than the upper surface of the molten metal layer, and a part of this raised part forms the above-mentioned upper first section. It is characterized in that the seed portion is supported by a plurality of electromagnetic rolls.

Further, according to the present invention, in the above-described configuration, a vibration means is further provided in the seed portion in order to peel off the solidified shell of the molten metal when the solidified shell is formed in the seed portion. A horizontal continuous casting apparatus is also provided.

In the present invention, the molten metal supply means includes a molten metal supply nozzle, and it is preferable that the tip of the molten metal supply nozzle is immersed in the molten metal layer.

Further, in the present invention, it is preferable that the side wall forming means is fixedly arranged with respect to the upper running portion of the endless belt, and the side wall forming means is vibrated in the width direction of the molten metal layer.

According to the present invention, the seed portion formed by the raised portion of the two-side running portion of the endless belt is supported by a plurality of electromagnetic rolls, so that the endless belt runs smoothly in that portion. It turns out. At this time, in order to maintain the magnetic properties of the belt, the temperature of the belt is automatically measured in front of the electromagnetic roll, and if the temperature of the belt is within the non-magnetic range, the temperature is measured by spraying.

(215°C) or below and control the electromagnetic roll so that it always works normally and effectively. Further, by providing a vibrating means in such a seed portion, even if a molten metal solidified shell is formed in the seed portion, the solidified shell is easily peeled off by the vibration of the vibrating means.

Further, in the present invention, the molten metal supply means includes a molten metal supply nozzle, and the tip of the molten metal supply nozzle is immersed in the molten metal layer, so that the molten metal is spouted from the molten metal supply nozzle. A portion of the molten metal will be directed near the bottom of the seed section, thereby actively preventing the formation of a solidified shell of molten metal near the bottom of the seed section.

Furthermore, in the present invention, the side wall forming means is arranged in a fixed state relative to the upper running portion of the endless belt, but since the side wall forming means is given vibration in the width direction of the molten metal layer, the molten metal and the side wall Seizure with the forming means is prevented.

Embodiment Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

1 and 2, a horizontal continuous casting apparatus according to the invention is indicated generally by the reference numeral 1. FIG.

The horizontal continuous casting apparatus 1 is equipped with an endless belt 2 which is passed around four rotating drums 3, 4, 5 and 6 and which is driven in the direction of the arrow R by means of a suitable drive (not shown). It is rotated in the direction shown.

As is clear from FIG. 1, the rotary drum 3 is arranged at a higher position than the other rotary drums 4.5 and 6, so that part of the upper run 7 of the endless belt 2, i.e. The left end of the running section 7 is lifted to form a raised section 8. A plurality of electromagnetic rolls 9 are provided below the rotating drum 3 and are arranged so as to gradually transition from the vertical direction to the horizontal direction (that is, in an L-shape). The electromagnetic roll 9 is attracted by the electromagnetic roll 9 and runs along the arrangement of the electromagnetic rolls 9. Note that the temperature of the endless belt 2 is set to A so that the endless belt 2 is reliably attracted by the electromagnetic roll 9. In order to lower the temperature to below (215℃),
A continuous temperature measuring device 21 is installed on the left side of the raised portion 8 of the endless belt 2.
and 22 are provided, and a plurality of water cooling nozzles 23 are provided between these continuous temperature measuring devices 21 and 22.

With this configuration, the magnetism of the endless belt 2 is always guaranteed, and the electromagnetic roll 9 is controlled to operate normally and effectively.

On the other hand, below the upper running part 7 of the endless belt 2, a plurality of backup rolls 10 are arranged upwardly along the running direction.
arranged so as to be inclined as a whole at an angle of 0° or less,
Therefore, the upper running portion 7 of the endless belt 2 runs at an inclination angle of 10° or less with respect to the horizontal direction. Also,
Strain correction rolls 1 are installed at appropriate locations on the running section of the endless belt 2.
1 is provided, thereby correcting distortion of the endless belt 2 due to heat.

As is clear from FIG. 2, side wall forming means 12 are disposed on both sides of the upper running portion 7 of the endless belt 2 in a state fixed to the upper running portion 7, thereby forming a molten metal layer 13. A housing mold is formed. In this case, the right-hand bottom part of the above-mentioned ridge 8 forms a seed part, which retains the molten metal layer 13 in the mold. The side wall forming means 12 can be made of a heat-resistant steel plate as an integral elongated product, or can be made of divided heat-resistant steel plates. Such sidewall-forming means 12 are vibrated by means of a suitable vibration device (not shown) - this prevents seizure between the sidewall-forming means 12 and the molten metal layer 13.

As shown in FIG. 1, the horizontal continuous casting apparatus 1 also includes a molten metal supply means 14, which includes a ladle 15, a tundish 16 provided below the ladle m15, and a tundish 16 provided below the ladle m15. The nozzle 17 extends vertically downward from the bottom of the nozzle 17.

The molten metal held in the ladle 15 is supplied to the mold from a nozzle 17 via a kundish 16 to provide a molten metal layer 13 within the mold. As is clear from FIG. 1, the tip of the nozzle 17 is immersed in the molten metal layer 13.

Further, the horizontal continuous casting apparatus 1 is equipped with a cooling means for cooling only the lower surface of the molten metal layer 13, and this cooling means consists of a water cooling nozzle 24 arranged between the plurality of backup rolls 10.

To describe the operation of the horizontal continuous casting apparatus 1 described above, first, the molten metal supplied from the molten metal supply means 14 becomes the molten metal layer 13 in the mold, and this molten metal layer 13 is formed on the endless belt 2. It is supported by the upper running section 7 and is continuously moved at an upward inclination angle of 10 degrees or less with respect to the horizontal direction. Note that the reason why the molten metal layer 13 is moved at an upwardly inclined angle in this manner is to facilitate the management of the thickness of the molten metal layer 13.

When the molten metal layer 13 is moved by the upper running section 7 of the endless belt 2, only the lower surface of the molten metal layer 13 is cooled by the cooling means, so that the molten metal layer 13 has a diagonal line in FIG. A solidified layer 18, shown as a region, is formed, resulting in unidirectional solidification from the bottom surface of the molten metal layer to its top surface. In addition, in order to guarantee such unidirectional solidification, as in the conventional case, the molten metal layer 1
A heat retaining agent is applied to the upper surface of 3, and part of the apparatus for applying this heat retaining agent is indicated by the reference numeral 19 in FIG.

According to the present invention, since the weir portion formed by the raised portion 8 of the upper running portion 7 of the endless belt 2 is supported by a plurality of electromagnetic rolls 9, it is possible to The endless belt 2 runs more smoothly on the weir portion than when the running of the raised portion of the upper running portion of the belt is restricted.

In the above-mentioned operation, the weir portion formed by the right bottom part of the protuberance 8 tends to form - a solidified shell of molten metal, as in the conventional case, but according to the present invention: The tip of the molten metal spouting nozzle 17 of the molten metal supply means 14 is submerged in the molten metal layer 13, and a part of the spouted molten metal is directed toward the weir portion, thereby preventing the formation of a molten metal solidified shell. be done. Further, according to the present invention, since the vibration means can be provided between the plurality of electromagnetic rolls 9 to vibrate the weir part, even if a molten metal solidified shell is formed in the weir part, the vibration The vibration of the means causes the solidified shell to peel off quickly.

As is clear from the above description, according to the present invention, only the lower surface of the molten metal layer is cooled while the molten metal layer is continuously transferred at an upward slope angle of 10 degrees or less with respect to the horizontal direction. This is a horizontal continuous casting device that performs unidirectional solidification of the molten metal layer from the bottom surface to the top surface thereof, and is capable of melting the upper running portion of the endless belt without impairing the smooth running of the endless belt. A horizontal continuous casting device is obtained in which the molten metal layer is raised to a height higher than the upper surface of the layer upstream of the metal supply means, and the raised portion can form a weir.

In addition to these features, horizontal continuous casting is constructed to prevent or prevent the formation of a solidified molten metal shell near the bottom of the weir formed by the raised portion of the upper running portion of the endless belt. A device is also obtained.

Further, according to the present invention, since the running of the endless belt at the weir part formed by the raised part of the upper running part of the endless belt is regulated by the electromagnetic roll, the replacement work of the endless belt can be done without the support of the bench. This is easier than the conventional case where a tool is used.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view schematically showing an embodiment of a horizontal continuous casting apparatus according to the present invention, and FIG. 2 is a schematic plan view of the horizontal continuous casting apparatus of FIG. 1. [Main reference numbers] 1. Horizontal continuous casting device: 2. Endless belt: 3.4.5.
6 Rotating drum: 8 Raised portion: 9 Electromagnetic roll; 10
Backup roll: 12 Side wall forming means: 13
Molten metal layer = 14 Molten metal supply means: I7 molten metal spout nozzle

Claims (6)

[Claims] (1) A horizontal continuous casting device that cools only the lower surface of the molten metal layer and performs unidirectional solidification from the lower surface to the upper surface of the molten metal layer, which supports the molten metal layer and an endless belt having an upper running section for continuously transporting the molten metal layer at an upward inclination angle of 10° or less with respect to the horizontal direction; and an upper running section of the endless belt for forming a mold together with the endless belt. side wall forming means provided on both sides of the mold, molten metal supply means for supplying molten metal into the mold to provide a molten metal layer, and the endless belt for cooling the molten metal layer from the lower surface thereof. and a cooling means provided below the upper running part of the endless belt, the upper running part of the endless belt melting the molten metal to form a weir for retaining the molten metal layer in the mold. A raised part raised to a height higher than the upper surface of the molten metal layer is provided on the upstream side of the metal supply means, and a part of the raised part that forms the weir is formed by a plurality of electromagnetic rolls. A horizontal continuous casting device characterized in that it is supported. (2) The molten metal supply means includes a molten metal supply nozzle, and the tip of the molten metal supply nozzle is immersed in the molten metal layer.
1) The horizontal continuous casting device described in item 1). (3) Claims (1) or (2) characterized in that the side wall forming means is fixed to the upper running portion of the endless belt and is vibrated in the width direction of the molten metal layer. Horizontal continuous casting equipment as described in Section. (4) A horizontal continuous casting device that cools only the lower surface of the molten metal layer and performs unidirectional solidification from the lower surface to the upper surface of the molten metal layer, which supports the molten metal layer and an endless belt having an upper running section for continuously transporting the molten metal layer at an upward inclination angle of 10° or less with respect to the horizontal direction; and an upper running section of the endless belt for forming a mold together with the endless belt. side wall forming means provided on both sides of the mold, molten metal supply means for supplying molten metal into the mold to provide a molten metal layer, and the endless belt for cooling the molten metal layer from the lower surface thereof. and a cooling means provided below the upper running part of the endless belt, the upper running part of the endless belt melting the molten metal to form a weir for retaining the molten metal layer in the mold. A raised part is provided on the upstream side of the metal supply means and raised to a height higher than the upper surface of the molten metal layer, and a part of the raised part that forms the weir is formed by a plurality of electromagnetic rolls. 1. A horizontal continuous casting apparatus, characterized in that the weir portion is supported by a vibrating means for peeling off a solidified shell of molten metal when a solidified shell of molten metal is formed in the weir portion. (5) The molten metal supply means includes a molten metal supply nozzle, and the tip of the molten metal supply nozzle is immersed in the molten metal layer.
4) The horizontal continuous casting device described in item 4). (6) Claims (4) or (5) characterized in that the side wall forming means is fixed to the upper running portion of the endless belt and is vibrated in the width direction of the molten metal layer. Horizontal continuous casting equipment as described in Section.