JPH0115341B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous casting method and a mold block directly used therein.

The conventional continuous casting method has been carried out using an apparatus as shown in FIG. 1, for example. First, this device will be explained. In the figure, numerals 1 and 2 are loop-shaped mold block moving devices installed vertically opposite each other. Both moving devices 1 and 2 are substantially symmetrical,
Mold loops 8, 9 formed by connecting a plurality of mold blocks 7 are wound around two sprockets 3, 4 and 5, 6, which are spaced apart from each other, through a chain (not shown). It was rotated,
The upper mold loop 8 is configured to rotate at the same speed in the direction of arrow A, and the lower mold loop 9 is rotated in the direction of arrow B. The outer peripheral surfaces of the upper and lower mold loops 8 and 9 that are each rotationally moved in the vertical plane touch each other in the opposing straight parts, and the upper and lower mold blocks 7 groups in the same part are adjacent to each other. The casting surfaces 7a formed on the outer peripheral surface of the mold block 7 form an elongated mold space 10 which is open at both ends and continuous. A nozzle 1 led from a pouring furnace 12 containing molten steel 11 is placed on the opening side of the mold space 10 on the starting point side (left side in the figure).
3 has been inserted.

Then, by using the device having the above configuration, while moving the mold block 7, the mold space 1 is removed from the nozzle 13.
Molten steel 11 is continuously poured into the mold block 7, and as the mold block 7 moves, the cast piece 11a, which has been transported in the direction of the arrow C and whose at least the outer surface has solidified, is taken out from the opening end 14 on the terminal side. Piece 11a) was being cast.

By the way, this conventional continuous casting method is
By using a mold block 7 having a casting surface 7a only on the outer circumferential surface A, and by connecting these mold blocks 7 in a loop and circulating them, casting can be performed using the casting surface 7a on the outer circumferential surface A of the mold block 7. Therefore, the same side of the mold block 7, that is, side A, is always in contact with the molten steel 11 and is used repeatedly. As a result, the temperature distribution within the mold block 7 becomes uneven, causing thermal distortion and thermal stress.
In addition, the surface in contact with the molten steel 11 becomes severely rough, resulting in a shortened service life and increased frequency of replacement.

This invention was made in view of the above circumstances,
Continuous casting allows for uniform temperature distribution within the mold block, reduces thermal stress and thermal deformation, and reduces wear and tear on the contact surfaces with molten steel, extending the life of the entire mold block and reducing the frequency of replacement. The object is to provide a method and a mold block for direct use thereof.

A feature of the present invention is that a mold block is provided with a casting surface in contact with the molten metal on both the outer and inner circumferential surfaces, and after casting using one of the casting surfaces,
The point is that the other casting surface is used for casting.

The contents of the present invention will be explained below based on specific examples with reference to FIGS. 3 to 9.

First, referring to FIG. 3, an embodiment of the mold block 20 of the present invention will be described.
1, grooves (casting surfaces) 20a are formed on the upper and lower surfaces, and the overall cross section H
It has a shape. Note that the end face 20b is flat so that it can come into close contact with the end face of another mold block 20.

Next, an example of the continuous casting method of the present invention will be described. 4 to 6 show an example of an apparatus for carrying out the method. 20 in the figure has the same shape as the mold block 20 described above, and has pins 22 on both left and right sides.
is installed protrudingly. These are not connected,
They are each independent, and are arranged to form loop-shaped sets 23 and 24 above and below, respectively, and the sprocket 2
5, 26 and 27, 28, the upper set 23 moves in the direction of arrow D, and the lower set 24 moves in the direction of arrow H in a loop shape at the same speed. That is, each loop-shaped set 23, 24 has sliding guide plates 29, 3 at its straight portion and folded portion, respectively.
0, holding guide plates 31, 32, curved guides 33, 34, falling-off prevention guides 35, 3
6 is provided, and sprockets 25, 26,
The teeth of 27 and 28 are hooked onto the pin 22a of the mold block 20, and the sprockets 25, 26, 2
By rotating the mold blocks 7 and 28, the mold blocks 20 move in a loop in a vertical plane while pushing and moving adjacent blocks 20 one after another.

In this case, sprocket 2 on one side (right side in the figure)
There are guides 35, 3 to prevent falling off around 5, 27.
6 is attached as shown in FIGS. 5 and 6, and guides 37, 38, and 39 are also provided for posture regulation, so that the mold block 20 is kept in a horizontal state as the sprockets 25 and 27 rotate. It is designed to move in parallel while maintaining the . At that time, the guides 37, 38, 39 are connected to the mold block 20.
The posture is controlled so that it does not rotate freely. In this way, the mold block 20 changes direction while moving in parallel at the folded part, so the sprockets 25, 2
The outer circumferential side and the inner circumferential side are reversed when entering and exiting 7. In other words, if surface A is on the outer circumferential side when entering, surface B, which is the back side, is on the outer circumferential side when exiting.

Further, curved guides 33 and 34 are attached around the other sprockets 26 and 28 that are paired with these sprockets 25 and 27, and here the block 20 is designed to rotate in the same manner as the sprockets 26 and 28. . Therefore, the outer circumferential side and the inner circumferential side are not reversed when entering and exiting. In other words, if surface A is on the outer peripheral side when entering, surface A will also be on the outer peripheral side when exiting.

In this way, the mold block 20 is constructed such that its upper and lower surfaces are reversed while it goes around the above-mentioned loop.

The upper and lower loop-shaped sets 23 and 24 of the mold blocks 20 are arranged such that the outer circumferential surfaces of the upper and lower mold blocks 20 touch each other at the opposing straight parts, as in the conventional case, and each of the upper and lower mold blocks 2 in the same straight part
In group 0, adjacent ones are connected in close contact with each other, thereby creating a long and narrow mold space 2 that is open at both ends and continuous by the casting surface 20a of the outer peripheral surface.
1 is formed. And this mold space 21
As in the conventional example, a nozzle 13 led from a pouring furnace 12 containing molten steel 11 is inserted into the opening end on the starting point side (left side in the figure).

In addition, 40, 41 are main pinch rolls, 42, 4
3 is a small pinch roll. These are set in holes provided in the holding guide plates 31 and 32, and serve to press and transfer the mold block 20. Further, by providing an appropriate speed difference between the main pinch rolls 40, 41 and the sprockets 26, 28, the gaps between the mold blocks 20 are eliminated, thereby preventing leakage of molten steel.

When casting is performed using the apparatus configured as described above, the molten steel 11 is continuously poured into the mold space 21 from the nozzle 13 while moving the mold block 20 as in the conventional example, and as the mold block 20 moves, the molten steel 11 is poured into the mold space 21 in the direction of the arrow. The cast piece 11a, which has been conveyed to and solidified at least on the outer surface, is taken out from the terminal side open end 14, thereby continuously forming a steel ingot (cast piece 11a).
to be cast. At this time, the A side and the B side of the mold block 20 are alternately exchanged while going around the loop, so that casting is performed on the A side and then on the B side, and this process is repeated alternately.

Therefore, the upper and lower surfaces of the mold block 20 come into contact with the molten steel evenly, resulting in a uniform temperature distribution and a reduction in thermal stress and thermal strain. It also reduces wear and tear on the parts that come into contact with molten steel, extending its life.

Further, according to the apparatus in this case, since the mold block 20 is completely separable, it not only requires no connecting means and has a simple structure, but also can be removed from the loop at will for easy replacement or maintenance.

Although the above example shows the case where no connecting means is provided, it goes without saying that the mold blocks 20 may be connected using any connecting means that does not impede movement, such as links with elongated holes. .

In addition, in the above example, the right side (downstream side) in Figure 4
Although the outer peripheral surface and the inner peripheral surface of the mold block 20 are reversed by the sprockets 25 and 27, the configurations of the left and right sprocket portions in the figure may be replaced.

In addition, in the above example, there are mold blocks 20 at the top and bottom.
A horizontal type is shown in which a set of loop-shaped blocks 23 and 24 are arranged and the blocks 20 are moved and combined in a vertical plane, but a set of mold blocks is arranged in a horizontal plane and the blocks 20 are moved in the horizontal plane. It may also be a horizontal type device that is combined as

Next, another example of an apparatus for carrying out the continuous casting method of the present invention will be described with reference to FIGS. 7 and 8. FIG. 7 is a plan view of the device, and FIG. 8 is a longitudinal sectional view. In this device, the mold block 20
are arranged horizontally, and two sets are combined horizontally to form a mold space 21 (see FIG. 9). Then, the mold blocks 20 are sandwiched between the left and right pinch rolls 44 and combined into a pair while being aligned and conveyed from the left to the right in FIG.

At the casting end point, that is, the part where the cast pieces 11a are taken out, conveying devices 45 are provided at both ends perpendicular to the alignment direction of the mold blocks 20, so that the mold blocks 20 can be taken out of the alignment line. This conveyor 45 is sequentially connected to other conveyors 46 and 47, and as a whole inserts the mold block 20, which has been removed outside the alignment line, into the casting start point, that is, into the pouring area of the molten steel 11 from both sides. A transport circuit 48 is configured to carry out the transfer. The direction of movement of the mold block 20 in this case is as indicated by the arrow in the figure. Further, a turntable 49 is provided in the middle of this conveyance circuit 48, which rotates 180 degrees horizontally to change the direction of the mold block 20 being conveyed, and reverses the direction of the mold block 20 and returns it to the starting point. It is now possible to return it. 50 is a push-out cylinder for transferring the mold block 20 from the turntable 49 to the next conveyance device 46, and 51 is a cylinder for inserting the mold block 20, which has been returned to the starting point after being reversed, into the starting point of the alignment line. be. Further, 12 is a pouring furnace containing molten steel 11, and 13 is a nozzle.

In this way, the mold blocks 20 are tied together two by two and placed one after another in close contact to form a mold space 21. After casting, the mold blocks 20 are separated into left and right sides and transported through the conveyance circuit 48. It is then conveyed, turned over midway, and circulated to the casting starting point.

For this reason, after casting is first performed on side A,
Casting is performed on the B side, and the casting surfaces 20a formed on both sides AB are used equally. Therefore, the same effects as those of the above-mentioned device explained in FIGS. 4 to 6 can be obtained.

Note that since the transport circuit 48 is located away from the alignment line, a cooling zone 52 and a drying zone 53 can be arbitrarily provided in the middle.

As explained above, when performing continuous casting, the present invention uses a mold block that has casting surfaces in contact with the molten metal on both the outer and inner peripheral surfaces, and performs casting using one of the casting surfaces. After that, the other casting surface is used for casting, so the temperature distribution within the mold block can be made uniform and thermal stress and strain can be reduced. Furthermore, wear and tear on the contact surface with molten steel can be reduced, so the lifespan can be extended and the frequency of replacement can be reduced.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view for explaining a conventional example, FIG. 2 is a view taken along the - arrow in FIG. 1, FIG. 3 is a perspective view of an embodiment of the mold block of the present invention, and FIG. A vertical sectional view showing an example of an apparatus for implementing the method of the invention, FIG. 5 is an enlarged view of the main part of the apparatus, FIG. 6 is a sectional view taken in the direction of the arrow in FIG. 5, and FIG. 7 is a method of the invention. FIG. 8 is a sectional view taken along the - arrow in FIG. 7, and FIG. 9 is a sectional view taken along the - arrow in FIG. 7. 11... Molten steel, 11a... Cast piece, 12... Pouring furnace, 13... Nozzle, 20... Mold block,
20a... Concave groove (casting surface), 21... Mold space,
23, 24...Loop-shaped set, 25, 26, 2
7, 28... Sprocket, 29, 30... Sliding guide plate, 31, 32... Holding guide plate, 3
3, 34...Curved guide, 35, 36... Falling prevention guide, 37, 38, 39... Guide for posture regulation, 48... Conveyance circuit, 49... Turntable.

Claims (1)

[Scope of Claims] 1 A continuous mold space is formed by connecting a plurality of mold blocks that are used in circulation, and molten metal is poured into the mold space while these mold blocks are moved for continuous casting. In the continuous casting method, the mold block is provided with a total of two casting surfaces in contact with the molten metal on each of the outer peripheral surface and the inner peripheral surface, and casting is performed using one of the casting surfaces. A continuous casting method characterized in that after the casting is completed, the other casting surface is used for casting. 2. A mold block for continuous casting that is used in circulation, and in which a plurality of mold blocks are connected in series to form a continuous mold space, and molten metal is poured into this mold space while being moved to perform continuous casting. A mold block for continuous casting characterized in that a total of two casting surfaces are provided on each of the outer circumferential surface and the inner circumferential surface in contact with the molten metal.