JPH0763808B2 - Denshi brake equipment for continuous casting molds - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a continuous casting method for continuously casting a multi-layer slab for composite steel having two injection nozzles and having different compositions in the surface layer portion and the inner layer portion. The present invention relates to an electromagnetic brake device attached to a mold of the device.

[Conventional technology]

As a method for producing a composite steel material in a continuous casting facility, for example, Japanese Patent Laid-Open No. 1-271031 proposes a technique of applying an electromagnetic brake device in a continuous casting mold. This technique uses two injection nozzles having different lengths, and an electromagnet is provided between the molten steel ejection ports of the injection nozzles to form a multi-layer cast product in which the boundary between the surface layer portion and the inner layer portion is made clear by magnetic means. Is the way to get.

However, regarding such an electromagnetic brake device for a continuous casting mold, there has been no start report so far regarding its specific structure.

[Problems to be Solved by the Invention]

By the way, in implementing the above-described electromagnetic brake device technology, there are some problems to be solved as follows.

(A) From the viewpoint of magnetic field strength, Japanese Patent Laid-Open No. 63-203256 discloses an example in which an electromagnetic brake device is installed in a continuous casting mold, but in this technique, the purpose is injection. The purpose is to slow down the molten steel flow from the nozzle in the mold and reduce the inclusions contained in the molten steel. The magnetic flux density required for these is 2500 to 3500 gauss.
It is shown in Japanese Patent No. 3 publication.

However, in this technique, when manufacturing a composite steel material by using two injection nozzles, it is necessary to separate the molten steel for the surface layer ejected from the nozzle above the mold and the molten steel for the inner layer ejected from the lower nozzle. In the whole width of one side,
A uniform magnetic flux density and a magnetic flux density about twice the above value are required. Therefore, the outer shape of the electromagnet becomes larger than that of the mold, which causes a problem that the device cannot be installed due to the limitation of the installation space that is set in view of the compatibility with peripheral devices such as a tundish car and a mold vibration device.

(B) In terms of mounting position, in the production of composite steel materials, the metal for the surface layer is generally made of a material having better characteristics than the metal for the inner layer, such as corrosion resistance and wear resistance. From the viewpoint of manufacturing cost, optimization of the surface metal thickness is important. In addition, when casting a multi-layer cast product, if the injection nozzle for the inner layer metal is too long, clogging occurs during use, and breakage easily occurs, causing a problem in durability. For this reason, the installation position of the electromagnetic brake device is optimal in the mold. However, even in this case, the above-mentioned reason causes a problem that the device cannot be practically installed.

The present invention provides an electromagnetic brake device for a continuous casting mold that solves the above problems.

[Means for Solving the Problems]

MEANS TO SOLVE THE PROBLEM This invention for solving the said subject has (1) The electromagnetic wave of the continuous casting mold of rectangular cross section which has two injection nozzles and was installed so that the molten steel injection part of this injection nozzle might differ in a height direction. In the braking device, an electromagnet having a width substantially equal to the width of the long side is provided on the long side of the mold with the magnetic poles facing each other between the two molten steel jetting portions, and a coil is wound around the outer circumference of the magnetic pole. An electromagnetic brake device for a continuous casting mold, characterized in that it is rotated and provided with an iron core of an electromagnet so as to surround the mold, (2) The width of this long side on the long side of the continuous casting mold of rectangular cross section. The magnetic poles of the electromagnet having a width substantially equal to
An electromagnetic brake device for a continuous casting mold according to the above item (1), characterized in that the upper part of the long side copper plate forming the mold is supported by a water box and the lower part is supported by magnetic poles of an electromagnet. On the long side of the continuous casting mold of the cross section, the magnetic poles of the electromagnet having a width substantially equal to the width of the long side are provided facing each other.
The upper side of the long side copper plate forming the mold is supported by a water box and the lower side is supported by magnetic poles of an electromagnet, respectively, and the upper part of the cooling water channel of the long side copper plate is a groove and the lower part is a deep hole. (4) An electromagnetic brake device for a continuous casting mold according to the above item (1), (4) a magnetic pole of an electromagnet having a width substantially equal to the width of the long side is provided on the long side of the continuous casting mold having a rectangular cross section,
The iron core of the electromagnet is provided so as to surround the mold, and the iron core is divided into a long side yoke and a short side yoke of the mold including the magnetic pole portion. (5) An electromagnetic brake device for a continuous casting mold according to item (5), in which a magnetic pole of an electromagnet having a width substantially equal to the width of the long side is provided to face the long side of the continuous casting mold having a rectangular cross section,
The iron core of the electromagnet is divided into four parts, a long side yoke and a short side yoke of a mold including a magnetic pole part, and the long side yoke and the short side yoke can be fastened by a spring and a tie rod. The electromagnetic brake device for a continuous casting mold according to (1) above.

[Work]

According to the present invention, since an electromagnet having a width substantially equal to the width of the long side of the mold is provided at an intermediate position of the molten steel ejection portions of the two injection nozzles so that the magnetic field can be uniformly applied to the entire width of the mold, When continuously producing a layered slab, it becomes possible to clarify the boundary between the surface layer and the inner layer metal and optimize the surface layer metal thickness.

Also, installation and assembly of an electromagnet with a strong magnetic field,
In order to facilitate handling and the like, the present invention is configured as follows.

(A) Regarding the long-side copper plate forming the mold, the upper groove is cooled and supported by a water box, and the lower portion is cooled by a deep hole and supported by an electromagnet to minimize the distance between opposing magnetic poles.

(B) The electromagnet is divided into four parts, a yoke part including opposing long-side magnetic poles and a short-side yoke, and the assembly is performed by a fastening device including a long-side yoke and a short-side yoke composed of tie rods and disc springs. Can be concluded by. This allows the mold body to be easily disassembled and assembled without any trouble.

(C) In order to sandwich the short side between the opposite long sides, the upper water box support is provided with a clamp device by a tie rod and a disc spring, and the lower electromagnet magnetic pole support is provided with the long side when assembled by the fastening device. By providing a gap between the side yoke and the short side yoke, the short side clamping force is obtained.

〔Example〕

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

1 (a) is a partial cross-sectional perspective view showing the entire structure of the continuous casting mold, FIG. 1 (b) is a schematic view showing the relationship between the mold and the electromagnet in the present invention, and FIG. A in Figure (a)
-A sectional view, FIG. 3 is a sectional view taken along the line BB of FIG. 1 (a), FIG. 4 is a sectional view taken along the line CC of FIG. 1 (a), and FIG. FIG. 6A is a sectional view taken along line DD of FIG.
7 is a sectional view taken along line EE in FIG. 7, and FIG. 7 is a sectional view taken along line FF in FIG.
8 is a sectional view taken along line HH of FIG. 6, and FIG. 9 is I of FIG.
Part detail drawing, FIG. 10 is detail drawing J of FIG. 7, and FIG.
FIG. 12 is a sectional view taken along the line GG in FIG. 12, FIG. 12 is a sectional view taken along the line LL in FIG. 11, FIG. 13 is a sectional view taken along the line KK in FIG. 11, and FIG. FIG. 15 and FIG. 15 are detailed views of the N portion of FIG.

In the figure, two injection nozzles 15a and 15b are inserted into the mold 1, the surface layer metal is injected from the injection nozzle 15a, and the inner layer metal is injected from the injection nozzle 15b. The electromagnet 7 is located in the lower part of the mold 1 and in the middle of the ejection ports of the injection nozzles 15a and 15b, and surrounds the outside of the mold 1 forming the mold cross section with the long side copper plate 3 and the short side copper plate 5. Note that 52 indicates molten steel and 16 indicates multi-layer cast slab.

The mold 1 is provided with the long side copper plate 3 whose upper part is supported by the water boxes 2a, 2b and whose lower part is supported by the magnetic poles 9 of the electromagnet 7, and short side support plates 24a, 24b provided on the water box 2b. A short side back plate 4 positioned and supported by the jack bolts 45, a short copper plate 5 supported by this, a disc spring 6 for firmly teaching the short copper plate 5 between the long side copper plates 3, and a tie rod. Clamping device 25 consisting of 21 and nut 22, and mold base frame 14 supporting them all together
It consists of

The long side copper plate 3 is fixed and supported by the water boxes 2a, 2b at the upper part and a number of mounting bolts 32 penetrating the water boxes to reach the long side copper plate 3, and further at the lower part by penetrating the magnetic poles 9 of the electromagnet 7 to the copper plate 3. It is fixedly supported on the magnetic pole 9 by a large number of bolts 17 reaching it. Further, the lower end portion that cannot be supported by the magnetic pole 9 is supported by the pressing plate 46 attached to the magnetic pole 9. In order to prevent the magnetic flux density of the electromagnet 7 from decreasing, the pressing plate 46 is made of a non-magnetic material, generally austenitic stainless steel.
It is fixed with 47, and the lower end of the long side copper plate 3 is likewise bolted.
It is supposed to be supported by 48.

Next, for cooling the long side copper plate 3, a large number of water cooling grooves 31 are provided in the upper part, and the cooling water passing through this is supplied and drained from the water boxes 2a and 2b. The lower thickness of the long-side copper plate 3 is about half the thickness of the upper part in order to maximize the magnetic field strength by minimizing the distance between the facing magnetic poles 9, and therefore a large number of water-cooled cooling units are provided. This is performed by the deep hole 34 for use. The cooling water is supplied from the upper part of the deep hole 34a from the water supply pipe 36 through the branch pipe 38a and the seal piece 39, passes through the adjacent deep hole 34b from the lower end collection hole 40, and the upper seal piece 39 and the branch pipe 38b are supplied as in the water supply. After that, it is drained to the drain pipe 37. Adjacent two deep holes 34a and 34b form one cooling water channel, and the lower end collecting hole 40 has a structure in which every two holes are divided by a plug 35.

The cooling water of the short-side copper plate 5 is supplied from the water hole 43a which is supplied to the back plate 4 from the water supply hose 41 to the cooling groove 44 of the short-side copper plate 5.
After cooling the short-side copper plate 5 through the through hole, the short-side copper plate 5 is discharged from the drain hose 42 through the water hole 43b.

The electromagnet 7 includes a winding 8, a magnetic pole 9, and a magnetic pole 9, which are provided so as to face each other on the long side.
A portion including a yoke 10 and a short-side yoke 11 for forming a magnetic path between the magnetic poles 9, the winding 8, the magnetic pole 9, and the yoke 10 being disposed on the long side, and the short side. The yoke 11 can be divided into four parts. Then, a fastening device 23 formed by penetrating the yokes 10 and 11 and including a tie rod 20, a disc spring 50, and a nut 51.
It has a structure that can be assembled together. In the figure, 54 is a split portion of the yoke, and 55 is an iron core.

As described above, the clamp device 25 that firmly holds the short-side copper plate 5 between the long-side copper plates 3 during casting has the water boxes 2a, 2b on the upper part.
The space between the tie rods 21 and the disc springs 6 is used.
A gap δ (about 0.5 mm) is provided in the divided portion 54 of the yokes 10 and 11, and the magnetic pole 9 is opposed to the spring force of the disc spring 50 of the fastening device 23.
The short-sided copper plate 5 is firmly sandwiched between the long-sided copper plates 3 via the.

The electromagnet 7 is supported by the base frame 14 and has an adjustable structure by a jack bolt 49 provided on the base frame 14 for alignment with the mold 1.

The foot roll 18 arranged immediately below the mold has a structure in which it is fixed to the foot roll mounting frame 26 mounted on the lower surface of the yoke 10 by the bolt 28 together with the chock 27, and provided on the mounting frame 26 as necessary. It can be adjusted with the jack bolt 29.

〔The invention's effect〕

The present invention is configured as described above, and therefore has the following effects.

(1) An electromagnet having a sufficient magnetic flux density and having a width substantially equal to the width of the long side is supported by directly supporting the copper plate on the long side of the mold with the water box on the upper side and the magnetic pole on the lower side. Since it was possible to install it in the lower part of the mold at the middle position of the injection port of the book injection nozzle, it was possible to minimize the mixing between the two layers and to manufacture a multi-layer cast product with a clear boundary between the surface layer and the inner layer. .

(2) The upper part of the mold, which requires high cooling capacity and sufficient strength against high-temperature deformation, has a copper plate thickness and cooling structure that have been sufficiently confirmed from the past, and both cooling capacity and high temperature strength are higher than those of the upper part. For the lower part, which is allowed to be inferior, the thickness of the copper plate is about half that of the upper part to maximize the magnetic flux density, and by adopting a deep hole cooling structure, it is possible to achieve both the magnetic flux density and mold performance required for practical use. Became.

(3) The electromagnet is divided into a yoke portion including two magnetic poles and windings, and two yoke portions for forming a magnetic path, and can be assembled by a fastening device including a tie rod and a disc spring. The mold can be easily assembled and disassembled, and the mold maintenance time and cost can be reduced.

In addition, a gap is provided between the yokes when the electromagnet is assembled by the fastening device, and it is possible to hold the short-side copper plate between the long-side copper plates by the disc spring force in the fastening device. This made it possible to ensure the mold cross-sectional shape, dimensional accuracy, and slab quality.

[Brief description of drawings]

1 (a) is a partial cross-sectional perspective view showing the entire structure of the continuous casting mold, FIG. 1 (b) is a schematic view showing the relationship between the mold and the electromagnet in the present invention, and FIG. A in Figure (a)
-A sectional view, FIG. 3 is a sectional view taken along the line BB of FIG. 1 (a), FIG. 4 is a sectional view taken along the line CC of FIG. 1 (a), and FIG. FIG. 6A is a sectional view taken along line DD of FIG.
7 is a sectional view taken along line EE in FIG. 7, and FIG. 7 is a sectional view taken along line FF in FIG.
8 is a sectional view taken along line HH of FIG. 6, and FIG. 9 is I of FIG.
Part detail drawing, FIG. 10 is detail drawing J of FIG. 7, and FIG.
FIG. 12 is a sectional view taken along the line GG in FIG. 12, FIG. 12 is a sectional view taken along the line LL in FIG. 11, FIG. 13 is a sectional view taken along the line KK in FIG. 11, and FIG. FIG. 15 and FIG. 15 are detailed views of the N portion of FIG. 1 …… Mold, 2a, 2b …… Water box, 3 …… Long side copper plate, 4 …… Short side back plate, 5 …… Short side copper plate, 7 …… Electromagnet, 8 …… Electromagnet winding, 9 …… Magnetic pole, 10, 11 …… Yoke, 12 …… Vibration table, 14 …… Mold base frame, 15a, 15b …… Injection nozzle, 16 …… Multi-layer cast, 20,21 …… Tie rod, 23 …… Yoke Fastening device, 25 …… Clamping device, 31 …… Long side copper plate cooling channel groove, 24, 34a, 34b …… Long side copper plate cooling channel deep hole, 50 ……
Yoke fastening spring, 52 …… Molten steel, 53 …… Nozzle molten steel ejection part, 54 …… Yoke split part, 55 …… Iron core

Claims (5)

[Claims] 1. An electromagnetic brake device for a continuous casting mold having a rectangular cross section, wherein two injection nozzles are provided, and the molten steel ejection portions of the injection nozzles are installed so that their positions are different in the height direction.
On the long side of the mold, an electromagnet having a width substantially equal to the width of the long side is provided between the two molten steel jetting parts with their magnetic poles facing each other, and a coil is wound around the outer circumference of the magnetic pole. An electromagnetic brake device for a continuous casting mold, wherein the iron core is provided so as to surround the mold. 2. A long side of a continuous casting mold having a rectangular cross section, wherein magnetic poles of electromagnets having a width substantially equal to the width of the long side are provided in opposition to each other, and the upper part of the long side copper plate forming the mold is a water box, The electromagnetic brake device for a continuous casting mold according to claim 1, wherein the lower parts are supported by magnetic poles of an electromagnet. 3. A continuous casting mold having a rectangular cross section is provided with a magnetic pole of an electromagnet having a width substantially equal to the width of the long side facing each other on the long side, and the upper part of the long side copper plate forming the mold is a water box, The electromagnetic brake device for a continuous casting mold according to claim 1, characterized in that the lower part is supported by magnetic poles of electromagnets, the upper part of the cooling water passage of the long side copper plate is a groove, and the lower part is a deep hole. . 4. A continuous casting mold having a rectangular cross section is provided with a magnetic pole of an electromagnet having a width substantially equal to the width of the long side facing each other on the long side, and the iron core of the electromagnet is surrounded by the outside of the mold. The electromagnetic brake device for a continuous casting mold according to claim 1, wherein the iron core is divided into four parts, that is, a long side yoke and a short side yoke of the mold including the magnetic pole portion. 5. A continuous casting mold having a rectangular cross section is provided with a magnetic pole of an electromagnet having a width substantially equal to the width of the long side facing each other on the long side, and the iron core of the electromagnet is provided on the long side of the mold including a magnetic pole portion. The electromagnetic brake for a continuous casting mold according to claim 1, wherein the yoke and the short side yoke are divided into four parts, and the long side yoke and the short side yoke can be fastened by a spring and a tie rod. apparatus.