JPS6289552A - Horizontal and continuous casting machine - Google Patents

Abstract

PURPOSE:To speed up and simplify the exchange of casting molds, to permit small lot production of different diameters and to improve productivity by exchanging the casting mold with a dummy bar-contg. casting mold after closing of a gate, welding the rear end of the already cast ingot and dummy bar and restarting casting. CONSTITUTION:After the gate 4 of a tundish 1 for storing a molten metal 2 is closed, the used casting mold 7 on a carriage 12a is exchanged with the dummy bar-contg. casting mold 16 on a carriage 12b. The rear end of the already cast ingot 10 and the dummy bar 16 are welded by a welding machine 15 and thereafter the horizontal and continuous casting is restarted by opening the gate 4. The exchange of the casting mold in the breakout stage is made quick and simple, by which the productivity is improved and the small lot production of different diameters is made possible. The exchange of the casting molds may be executed by any of methods for exchanging the casting molds with vertically supporting side arms by swiveling the casting molds with each other, exchanging the casting molds having arms for horizontally and pivotally supporting the molds in a casting direction at both ends by swiveling the same or sliding the casting molds supported by cross slide gates.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a horizontal continuous casting machine, and particularly to a horizontal continuous casting machine in which molds can be quickly changed.

[Prior art and its problems] In a horizontal continuous casting machine, in the case of a single strand,
If the break ring is melted or damaged, the surface of the slab deteriorates and casting becomes impossible, or if a breakout occurs, stop casting and replace the tundish and mold with new ones. .

However, it takes a lot of time to replace the tundish and mold, and the temperature of the molten steel in the ladle drops during this replacement work, so in the case of a single strand, it is difficult to replace the molten steel in the ladle after restarting casting. There is a problem in that the remaining molten steel cannot be continuously used for continuous casting.

In addition, in the case of multiple strands, even when replacing the mold, casting can be continued with the remaining strands. However, if only the remaining strand is cast during the mold replacement operation, the casting time becomes longer, and the temperature of the molten steel in the ladle drops significantly, so that it may not be possible to cast the entire amount in one charge in the ladle.

In addition, in a single-strand horizontal continuous casting machine, if you try to change the mold to cast slabs of different shapes or sizes with the same charge mtA, it will take a lot of time to replace the tundish and mold as described above. Because it takes time,
Similar to the above case, there is a problem in that the humidity of the molten steel decreases, making it difficult to continue casting.

This invention was made in view of such circumstances, and
It is an object of the present invention to provide a horizontal continuous casting machine capable of quickly changing molds.

[Means for Solving the Problems 1] The horizontal continuous casting machine according to the present invention includes a tundish for storing molten metal, and a tundish that is installed in the tundish and opens and closes the casting port to cause the molten metal to flow out from the tundish or The present invention is characterized by comprising a gate for stopping the outflow, and a mold changing means for removing the cast mold after closing the gate and attaching a new mold containing a dummy bar to the spout of the tundish. In this case, it is preferable to have a welding means for connecting the rear end of the previously cast slab to the dummy bar at the start of casting.

Further, the mold changing means may have a mold truck on which the #S mold is installed and move in a direction perpendicular to the casting direction, and the mold can be removed and attached by moving the mold truck.

Furthermore, the mold changing means may be configured to rotate the mold with a rotation axis in a direction perpendicular to the casting direction and install the mold in the casting spout. Furthermore, the mold changing means may be configured to rotate the mold with a rotation axis parallel to the casting direction and install the mold in the casting opening. Furthermore, the mold changing means has a slide frame that slides the mold in a direction perpendicular to the casting direction,
It is also possible to configure the mold to slide within this frame and install the mold in the casting opening.

[Embodiments] Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings.

FIG. 1 is a vertical sectional view showing a horizontal continuous casting machine according to an embodiment of the present invention, and FIG. 2 is a plan view showing the mold changing operation. A tundish 1 in which molten steel 2 is stored is made of refractory material and placed on a trolley 11. Trolley 11
moves back and forth on the rail 17a to position the tundish 1 at a predetermined position. A pouring port 9 is formed in the side wall of the tundish 1, a nozzle 3 is installed in the pouring port 9, and the molten steel 2 flows out from the nozzle 3. A slide gate 4 is connected to the tip of the nozzle 3. The slide gate 4 is connected to a piston of a cylinder 20 such as a hydraulic cylinder, and is opened and closed by vertical movement of the piston by a pressure medium, so that molten steel can flow out or the outflow can be stopped. .

The mold 7 is placed on the upper surface of the mold trolley 12a, and the mold 7 is mounted on a rail 17b in a substantially horizontal direction perpendicular to the casting direction via wheels provided at the lower part of the mold trolley 12a. It is possible to move in certain arrow 18 and arrow 19 directions.

The mold 7 is made of copper or a copper alloy, and a passage for cooling water is formed in the mold so that the mold 7 is cooled by water. Further, the mold truck 12b is the mold truck 1
2. Similar to a, it moves on rails 17b, and a new mold for replacement is placed on this mold trolley 12b. A dummy bar 16 is inserted into the casting space of this replacement mold, and the dummy bar 16 pulls out the slab produced after the mold is replaced.

The feed nozzle 5 has a cylindrical shape, and its outer peripheral surface is expanded in diameter in the casting direction. The mold 7 and the feed nozzle 5 are fixed by a fixing member 6 with a break ring 8 interposed therebetween. The fixing member 6 has a disc shape and is fitted onto the feed nozzle 5. For example, when the fixing member 6 is tightened to the mold 7 with bolts and nuts, the fixing member 6 is locked to the outer peripheral surface of the feed nozzle 5. , feed nozzle 5 and mold 7
is securely fixed. The break ring 8 is made of refractory material and is installed between the feed nozzle 5 and the mold 7 to prevent molten steel from flowing out from between the feed nozzle 5 and the mold 7.

During casting, the slide gate 4 and the feed nozzle 5 of one mold are connected and sealed to prevent air from entering and molten steel from flowing out.

1312 is supplied from the tundish 1 to the mold 7 via the nozzle 3, slide gate 4, and feed nozzle 5, and is cooled and solidified in the mold 7.

The pinch rolls 14 are disposed vertically opposite each other on the downstream side of the mold 7 in the casting direction, and are rotationally driven by a motor (not shown). When the slab 10 obtained by solidifying the molten steel in the mold 7 is supplied between the pinch rolls 14, the slab 10 is bitten by the pinch rolls 14, and is handled and driven. A guide roll 13 is installed below the slab 10 between the mold 7 and the pinch roll 14, and this guide roll 13 guides the slab 10 to the pinch roll 14.

The welding machine 15 is installed above the slab 10 between the mold 7 and the pinch roll 14, and welds the rear end of the slab after casting to the tip of the dummy bar 16 inserted into the new mold after replacement. It is supposed to be done.

Next, the operation of the device configured in this way will be explained. First, when the slide gate 4 is inserted, the molten steel 2 is supplied to the mold 7 via the nozzle 3, the slide gate 4, and the feed nozzle 5, and is cooled by the mold 7 and solidified to become the slab 10. As shown in FIG. 1, this slab 10 passes through guide rolls 13 and is pulled out by pinch rolls 14.

Next, when replacing the mold, as shown in FIG. 2, the slide gate 4 is closed and the supply of molten steel 2 to the mold 7 is stopped. When the end of the slab 10 reaches below the welding machine 15, the rotation of the pinch roll 14 is stopped and the slab 10 is stopped at that position. Then, the slide gate 4 and the feed nozzle 5 are separated, and the mold truck 12a on which the previous mold is placed is moved in the direction of the arrow 18. Thereafter, the mold cart 12b on which the new mold was placed was moved in the direction of arrow 18 to the position where the mold cart 12a was installed, and the new mold was finely adjusted in the casting direction and attached to the slide gate 4 and the new mold. Connect with feed nozzle. Then, the tip of the dummy bar 16 inserted into the new mold and the rear end of the slab 10 are welded together by welding tl15. Thereafter, the slide gate 4 is opened to allow the molten steel 2 to flow out from the tundish 1, and the vinyl roll 14 is driven to pull out the slab 10, and casting is restarted.

If the mold is to be replaced further, the slide gate 4 is closed again to stop the flow of molten steel 2, and the mold, feed nozzle, and break ring on the mold cart 12a moved in the direction of arrow 18 are replaced with new ones. Then, the mold after casting is removed, the mold truck 12b is moved in the direction of arrow 19, the mold truck 12a is moved in the direction of arrow 19, and a new mold is connected to the casting port 9 in the same manner as described above. As described above, according to the horizontal continuous casting machine according to the embodiment of the present invention, when the slide goo 1-4 is closed to stop the outflow of the molten steel 2 and there is no slab in the mold 7, easy operation is possible. Since the mold can be exchanged quickly, the mold can be replaced quickly.

In addition, if the shape of the slab changes during casting,
Due to changes in the thickness of the slab in the passage area of the slab, it may be necessary to move the tundish 1 up and down. Install. Also,
In this example, one mold is placed on each 2M mold cart, but even when two molds are placed on one mold cart, the mold cart is moved.・Molds can be quickly replaced.

Next, a modification of the mold exchange means will be described. 3 to 5 are schematic diagrams showing modified examples of the mold changing means, and are front views showing the tundish 1 from the side of the vinyl roll 14. FIG. In FIG. 3, the shaft 21 is
They are installed on both sides of the casting port 9 with the longitudinal direction vertical. An arm 23 is fixed to each of the two shafts 21 perpendicularly to the shaft 21, a mold 7 is fixed to each end of the arm 23, and the mold 1 rotates about the shaft 21 as a rotation axis. To replace the mold in the state shown in FIG. 3, remove the mold connected to the casting port 9 of the tundish 1 between the slide gate 4 and the feed nozzle 5, and
Rotate in direction b. Then insert the new mold into the arrow 22b.
direction and connect it to the casting port 9. In addition, when replacing the mold, replace the mold on the side not used for casting with a new one in advance, remove the connected mold from the casting spout 9, rotate it in the direction of arrow 22a, and insert the new mold. arrow 2
Connect it to the casting port 9 by rotating it in the direction 2a.

In FIG. 4, a shaft 24 is installed on the side of the casting spout 9 of the tundish 1 with its longitudinal direction parallel to the casting direction. An arm 26 perpendicular to the shaft 24 is fixed to this shaft 24, and a mold 1 is fixed to each end of this arm 26.

The mold 1 rotates about the shaft 24 as the rotation axis. To replace the mold in the state shown in Fig. 4, remove the mold connected to the casting port 9 of the tundish 1 between the slide gate 4 and the feed nozzle 5, and rotate the arm 26 in the direction of the arrow 25. . Then, the arm 26 is further rotated in the direction of the arrow 25 to connect a new mold to the casting port 9. Furthermore, when replacing the mold, replace the mold on the side not used for casting with a new one in advance, remove the connected mold from the casting port 9, rotate the arm 26 in the direction of the arrow 25, The arm 26 is further rotated in the direction of the arrow 25 to connect a new mold to the casting port 9.

In FIG. 5, a slide frame 27 is installed on the downstream side of the tundish 1 in the slab feeding direction, with its four sides facing perpendicular to the casting direction.
Two molds are configured to slide within this frame 27 in a direction 28 perpendicular to the casting direction. In order to replace the mold in the state shown in FIG. 5, the mold connected to the casting port 9 of the tundish 1 is removed between the slide gate 4 and the feed nozzle 5, and is slid along the slide frame 27. Then, a new mold is slid along the slide frame 27 in the direction of arrow 28 and connected to the slide gate 4. Furthermore, when replacing the mold, replace the mold not used for casting with a new one in advance, and
Remove the mold connected to the casting spout 9, slide it along the slide frame 21 in the direction of arrow 28, and slide a new mold along the slide frame 27 to connect it to the casting spout 9.

[Effects of the Invention] According to the present invention, the mold replacement operation is simplified, so that the mold replacement can be speeded up.

As a result, long-time casting and multi-charge casting can be performed continuously, improving productivity.

In addition, mold replacement is speeded up, and by making the mold in preparation different in shape and size from the mold in use, slabs of different shapes and sizes can be cast with one charge of molten metal. This makes it possible to produce a wide variety of products in a small loft. Furthermore, mold replacement can be done more quickly, so the break ring, which accounts for a high proportion of casting costs, can be replaced with a material that is relatively less eroding resistant and less costly, and the mold can be replaced more frequently. , casting costs can be reduced. Furthermore, since the mold can be replaced quickly, the time required to interrupt casting in the event of an accident such as a breakout is shortened, and casting can be quickly restored.

[Brief Description of the Drawings] Fig. 1 is a longitudinal sectional view showing a horizontal continuous casting machine according to an embodiment of the present invention, Fig. 2 is a plan view showing its mold changing operation, and Figs. 3 to 5 are molds. It is a schematic diagram which shows the modification of an exchange means. 1; tanditshu, 2: molten steel, 3.5; nozzle, 4;
Slide gate, 6; Fixed member, 7; Mold, 8; Break ring, 9; Casting port, 10: Slab, 11.12a, 1
2b; Trolley, 13.14; Roll, 15; Welding machine, 16
: Dummy bar, 17a, 17b; Rail, 20 Niji cylinder, 21.24; Shaft, 23.26; Arm, 27: Frame. Applicant's agent Patent attorney Takehiko Suzue Figure 3 Figure 4vA Figure 5

Claims (6)

[Claims] (1) A tundish that stores molten metal, a gate that is installed in this tundish and allows the molten metal to flow out or stop the outflow from the tundish by opening and closing the casting port, and after the gate is closed and after casting. 1. A horizontal continuous casting machine, comprising: mold changing means for removing the mold and attaching a new mold containing a dummy bar to the casting opening of the tundish. (2) The horizontal continuous casting machine according to claim 1, further comprising a welding means for connecting the rear end of the previously cast slab to the dummy bar at the start of casting. (3) The mold changing means has a mold truck on which the mold is installed and moves in a direction perpendicular to the casting direction, and the mold is removed and attached by moving the mold truck. Horizontal continuous casting machine as described in Section. (4) Horizontal continuous casting according to claim 1, wherein the mold changing means rotates the mold with a rotation axis in a direction perpendicular to the casting direction and installs the mold in the casting opening. Machine. (5) Horizontal continuous casting according to claim 1, wherein the mold changing means rotates the mold with a rotation axis parallel to the casting direction and installs the mold in the casting opening. Machine. (6) A patent claim characterized in that the mold changing means has a slide frame for sliding the mold in a direction perpendicular to the casting direction, and the mold is installed in the casting opening by sliding the mold within this frame. Horizontal continuous casting machine according to item 1.