JP5423564B2 - Continuous casting mold equipment - Google Patents

Description

  The present invention relates to a continuous casting mold apparatus used when a slab having a circular cross section, a square shape, or a rectangular shape is manufactured.

  For example, a billet slab having a circular or square cross section is used as a rolling material for pipes or shaped steel. Since the number of rolling differs depending on the product dimensions (diameter and size), the pipe or shape steel that is the final product does not have a fixed cross-sectional size in the billet slab.

  Here, a slab cast by continuous casting or a rolled steel ingot after ingot casting is defined as a billet having a circular or square cross section. Is defined as a square billet. Similarly, a slab having a rectangular cross section of the slab or steel ingot described above is defined as bloom.

  The continuous casting equipment was installed on the outlet side of the mold, the tundish receiving the supply of molten steel from the ladle, the copper plate mold (hereinafter simply referred to as the mold) from which the molten steel is poured through the immersion nozzle. Consists of Laura Apron. Of these, the mold is attached to the mold frame. The roller apron is a frame structure composed of rolls having a gap equivalent to the cross-sectional diameter or cross-sectional thickness of the slab. The roller apron is arranged in several stages, and the slab pulling speed is adjusted by the driving roll. Continuous casting.

  In the continuous casting, the molten steel injected into the mold is cooled in contact with the inner surface of the mold to form a thin solidified shell. This solidified shell is solidified and contracted as the temperature drops and is pulled out of the mold. Then, as it moves to the downstream side, it is secondarily cooled by a cooling water spray installed in a roller apron on the downstream side of the mold frame to grow a solidified shell, and a cast piece is continuously cast.

  By the way, it is disclosed that a cylindrical mold is used as a mold used when continuously casting round billets or square billets (for example, refer to Patent Documents 1 and 2).

  The billet mold used when continuously casting the billet slab has a circular or square cylindrical shape in contact with the molten steel, and has a jacket structure in which the inner cylinder and the mold frame surround the outer periphery of the mold. .

  The cooling water flowing between the mold and the inner cylinder cools the mold in contact with the molten steel, thereby promoting the solidification of the molten steel in the mold and preventing the mold from being deformed. It depends on the distance (cross-sectional area) between the mold and the inner cylinder.

  In general, the interval between the mold and the inner cylinder is set at a constant interval to ensure the linear flow velocity of the cooling water flowing between the mold and the inner cylinder, so it matches each size of the billet slab (mold) to be manufactured. A mold frame is required.

  Similarly, a roller apron called a dedicated body directly below the mold that receives the mold frame at the top (hereinafter referred to as a dedicated roller apron) is a dedicated roll according to the size of the slab to be manufactured (diameter or thickness of the slab). It becomes an interval. Furthermore, the roller apron installed on the downstream side of the dedicated roller apron generally has a structure in which the roll interval is variable according to the diameter or thickness of the slab.

  Since these molds are required for each size of the slab to be manufactured, conventionally, in addition to the mold, the inner cylinder, the mold frame, and the dedicated roller apron must be replaced according to the size of the slab to be manufactured. It was essential.

  Thus, conventionally, in addition to the mold, the inner cylinder, the mold frame, and the dedicated roller apron must be held for each cross-sectional size of the slab to be manufactured. In this case, the initial investment amount increases. In addition, a large space is required when the mold frame or the like is not used.

JP 2003-305543 A JP-T-2006-523534

  The problem to be solved by the present invention is that, conventionally, the mold frame and the dedicated roller apron must be held for each cross-sectional size of the slab to be manufactured. If this is the case, the initial investment will increase. In addition, a large space is required when the mold frame or the like is not used.

The mold apparatus for continuous casting of the present invention is
In order to continuously cast slabs of various sizes, the mold frame and the dedicated roller apron need not be held for each cross-sectional size of the slab to be manufactured.
A cylindrical mold having a circular or square or rectangular cross section, which is attached via an upper flange and a lower flange so that the inside of the mold frame is a sealed annular space, and the mold on the outer peripheral side of the mold in the annular space. An inner cylinder that forms a cooling water passage is maintained at a constant interval, and the inner cylinder is fixed in the mold frame by a partition plate, and at the same time, the outer peripheral side of the inner cylinder in the mold frame is cast in the casting direction. With a structure that has a space for water supply and drainage divided into upper and lower sides,
A mold apparatus for cooling the back surface of the mold by passing the cooling water passage from the downstream side to the upstream side in the casting direction and continuously casting a slab having a circular or square or rectangular cross section,
As the outer side path line of the dedicated member roller apron is present on the extension of one inner wall surface of the mold, the mold and the inner cylinder are arranged so as to allow eccentric to the mold frame, one mold frame The main feature is to enable casting of slabs of multiple sizes .

The mold apparatus for continuous casting according to the present invention is arranged so that the mold and the inner cylinder can be eccentric to the mold frame so that the outer pass line of the dedicated roller apron exists on the extension of one inner wall surface of the mold. doing. And, for example, when installing in a curved continuous casting machine, a curved outer path line of a dedicated roller apron is present on the extension of the inner wall surface of the mold located outside the curved side of the continuous casting machine. It is possible to cast slabs of various sizes with the frame. In addition, the exclusive roller apron installed immediately below the mold frame only needs to be adjusted to the interval of the slab diameter or slab thickness.

  According to the present invention, the same mold frame can be used regardless of the cross-sectional shape. In addition to producing a minimum number of mold frames for slabs of various sizes, it is effective in reducing inventory of the mold frames owned for each slab size.

  Further, the mold replacement time during non-operation in continuous casting using the present invention is the same as the conventional one, and the work time required for mold replacement is not extended. As a result, it is possible to reduce the fixed cost in continuous casting, and it is possible to supply slabs of various sizes at low cost.

It is the schematic of the casting apparatus for continuous casting of this invention for continuously casting the round billet whose outer diameter is 360 mm, (a) is a longitudinal cross-sectional view, (b) is AA sectional drawing of (a). FIG. 2 is a view similar to FIG. 1 for continuously casting a round billet having an outer diameter of 265 mm.

In the present invention, the outer pass line of the dedicated roller apron is formed on the extension of one inner wall surface of the mold so that the mold frame does not have to be held for each cross-sectional size of the slab to be manufactured. This is realized by arranging the mold and the inner cylinder on the mold frame so that they can be eccentric.

  The continuous casting mold apparatus of the present invention will be described below.

  The continuous casting mold apparatus of the present invention enables casting of slabs of a plurality of sizes with a single mold frame when continuously casting using a mold determined in accordance with the size of the slab to be continuously cast. The configuration is as follows.

The mold has a cylindrical shape with a circular cross section , a square shape, or a rectangular shape, and is attached to the mold frame via an upper flange and a lower flange to form a sealed annular space in the mold frame.

  An inner cylinder that forms a cooling water passage for flowing cooling water in a direction opposite to the casting direction while maintaining a certain distance from the casting mold is disposed on the outer peripheral side of the mold in the annular space. The inner cylinder is fixed in the mold frame by a partition plate, and at the same time, the outer peripheral side of the inner cylinder in the mold frame is divided into upper and lower parts in the casting direction to form a water supply / drainage space.

In the present invention, in order to enable casting of slabs of different sizes using the same mold frame, the mold is such that the outer pass line of the dedicated roller apron exists on the extension of one inner wall surface of the mold. Are arranged so as to be eccentric with respect to the mold frame.

In addition, in order to ensure the linear flow velocity of the cooling water flowing through the cooling water passage formed by the gap between the mold and the inner cylinder at the outer periphery of the mold, not only the mold but also the inner part fixed in the mold frame by the partition plate. The cylinder is also arranged so that it can be eccentric like the mold.

  In that case, in order to be able to attach a plurality of sets of molds and inner cylinders adapted to each slab size to the same mold frame, as described above, each mold is eccentrically arranged, Prepare the lower flange.

  On the other hand, a partition plate that also serves as a partition for upper and lower water supply and drainage that attaches the inner cylinder to the mold frame, for example, has a configuration in which a partition flange attached to the inner cylinder and a partition flange attached to the mold frame are integrated with bolts. prepare.

  In actual operation, since cooling water of 1000 liters / min or more flows, the linear flow velocity of cooling water necessary for cooling can be secured in the cooling water passage by adjusting the supply water pressure and the drainage pressure. Further, when the linear flow velocity is small, the cooling ability can be ensured also by arranging an O-ring between the partition flange attached to the inner cylinder and the partition flange attached to the mold frame to ensure sealing performance. Can do.

  1 and 2 are schematic views of a continuous casting mold apparatus of the present invention for continuously casting a round billet used as a pipe material. FIG. 1 shows an outer diameter of 360 mm, and FIG. 2 shows an outer diameter of 265 mm. Is.

In the continuous casting mold apparatus 1 shown in these drawings, in order to enable casting of round billets of different sizes using the same mold frame 3, a mold 2 having an integral structure in a circular cylindrical shape with respect to the mold frame 3. Are arranged eccentrically so that the outer pass line of a dedicated roller apron (not shown) immediately below the mold frame 3 exists on the extension of one inner wall surface 2a.

  The mold 2 is attached to the mold frame 3 through a ring-shaped upper flange 5a and a lower flange 5b formed on the upper and lower end surfaces of the mold frame 3 at the eccentric position with respect to the outer peripheral end surface. This is done by attaching. By mounting the mold 2, a sealed annular space 4 is formed in the mold frame 3.

  Further, on the outer peripheral side of the mold 2 in the annular space 4, an inner cylinder 7 that forms a cooling water passage 6 in a direction opposite to the casting direction of the mold 2 while maintaining a certain distance from the mold 2 is provided as a partition plate. 8 is fixedly arranged in the mold frame 3. At the same time, the partition plate 8 divides the outer peripheral side of the inner cylinder 7 in the mold frame 3 vertically in the casting direction to form a water supply space 4a and a drainage space 4b.

Then, in order to ensure the linear flow rate of the cooling water flowing through the cooling water passage 6, as well as the mold 2, inner cylinder 7 by a partition plate 8 is fixed to the mold frame 3 also has eccentric like the mold 2 It is possible .

  In the example shown in FIGS. 1 and 2, the partition plate 8 is configured such that the partition flange 8a attached to the inner cylinder 7 and the partition flange 8b attached to the mold frame 3 are integrated by bolts 8c and nuts 8d. It is.

  In FIG. 1 and FIG. 2, 3a is a water supply hole provided in a part of the mold frame 3 that communicates with the water supply space 4a, and 3b is a water drain hole that is provided in a part that communicates with the drainage space 4b. Reference numeral 9 denotes a water supply / drainage box for supplying water from the water supply hole 3a, flowing the cooling water passage 6 in the anti-casting direction to cool the mold 2 from the back side, and discharging the cooled water from the drainage hole 3b.

  Reference numeral 10 denotes a foot roll that holds a slab from the mold 2, and is attached below the mold frame 3 by a foot roll stand 11. Reference numeral 12 denotes a mold holding flange.

  Since the outer diameter of the round billet to be continuously cast is different, the cross-sectional dimensions of the mold 2 and the inner cylinder 7 used for continuous casting are different when FIG. 1 and FIG. 2 are compared.

  Accordingly, the outer peripheral diameters of the upper flange 5a, the lower flange 5b, and the partition plate 8 (partition flange 8b) are the same as in FIGS. 1 and 2, but the inner peripheral diameters of the upper flange 5a, the lower flange 5b, and the partition plate 8 are the same. And the center position of this inner peripheral part differs in FIG. 1 and FIG.

At this time, the mold 2, so that there is outside the pass line of the dedicated member roller apron on the extension of one of its inner wall surface 2a, since as possible eccentricity to the template frame 3, dedicated body Roraepuro down the slab径或physician may only roll adjustment in accordance with the spacing of the slab thickness.

  Thus, in the present invention, by exchanging components other than the mold frame 3, several types of cast pieces can be continuously cast while using the same mold frame 3.

  Table 1 below shows the sizes of billet slabs continuously cast by applying the continuous casting mold apparatus of the present invention shown in FIGS. 1 and 2. In the case of twin casting, it was possible to continuously cast the billet slab diameter in the range of 180 mm to 225 mm with the same mold frame.

  Similarly, in the case of single casting, it was possible to continuously cast the billet slab diameter in the range of 265 mm to 360 mm with the same mold frame.

  Twin casting refers to casting with a plurality of casting strands, and single casting refers to casting with a single casting strand, and is selected according to the scale of the molten steel.

  As can be seen from the examples of FIGS. 1 and 2, if the continuous casting mold apparatus of the present invention is used, the mold frame can be easily unified.

  The present invention is not limited to the above example, and it goes without saying that the embodiments may be changed as appropriate within the scope of the technical idea described in each claim.

  For example, in the above example, a case where a billet slab having a circular cross section used for manufacturing a pipe is continuously cast is described. However, a billet slab having a square cross section used for manufacturing a steel plate or a rectangular bloom is described. A slab may be continuously cast. Further, the mold 2 is not limited to an integral structure, but may be a divided structure.

DESCRIPTION OF SYMBOLS 1 Mold apparatus for continuous casting 2 Mold 2a One inner wall surface 3 Mold frame 4 Annular space 4a Water supply space 4b Drain space 5a Upper flange 5b Lower flange 6 Cooling water passage 7 Cylinder 8 Partition plate 8a Partition flange 8b Partition flange 8c Bolt

Claims (3)

In order to make the inside of the mold frame a sealed annular space, a cylindrical copper plate mold having a circular or square or rectangular cross section, which is attached via an upper flange and a lower flange, and an outer peripheral side of the copper plate mold in the annular space, An inner cylinder that forms a cooling water passage is maintained at a certain distance from the copper plate mold, and the inner cylinder is fixed in the mold frame by a partition plate, and at the same time, the outer circumference side of the inner cylinder in the mold frame. With a structure having a space for water supply and drainage divided into upper and lower in the casting direction,
The cooling water passage is cooled from the downstream side in the casting direction to the upstream side to cool the back surface of the copper plate mold, and a mold for continuously casting a slab having a circular or square or rectangular cross section,
Wherein as the outer side pass line of the roller apron provided directly below the copper plate mold on one of the inner wall surface of the extension on the copper plate template was present so as to enable eccentricity of the copper plate mold and the inner tube in the mold frame arranged, one continuous casting mold, characterized in that to enable the casting of a plurality of sizes of slabs in a mold frame.   The partition plate for fixing the inner cylinder in the mold frame has a structure in which a partition flange attached to the inner cylinder and a partition flange attached to the mold frame are integrated. The mold for continuous casting as described.   The continuous casting mold according to claim 1, wherein the cylindrical copper plate mold has an integral structure.

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