JPH0424135B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a multi-equipment type electromagnetic casting device, and more particularly to a multiple-equipment electromagnetic casting device that can economically and stably cast ingots of various sizes. It is something.

(Prior art and its problems) As is well known, the electromagnetic field casting method has traditionally been a type of continuous casting method (including semi-continuous casting method; the same shall apply hereinafter) for metals, especially aluminum or its alloys. , a predetermined molten metal supplied through a nozzle, etc. is held in a column shape by an electromagnetic field generated by a coil, and is continuously cooled and solidified in the vertical direction using cooling water, etc. The clumps are formed continuously.

In the case of such electromagnetic field casting, in order to improve productivity in particular, a multi-unit casting machine is generally used, which is equipped with a plurality of casting units composed of pouring devices, coils, etc. Using,
A multiple casting method is employed in which a plurality of ingots are continuously and simultaneously formed by these casting units.

By the way, in the case of a casting device used for such multi-load casting, as shown in Japanese Patent Publication No. 49-24772, the coils in each casting unit usually correspond to the structure of each casting unit. It is integrally formed by a one-turn coil that has a plurality of continuous coil parts formed with a shape, and by connecting one power source in series to the one-turn coil. , a predetermined electromagnetic field can be generated in each casting unit.

On the other hand, ingots formed by such multiple casting, especially slabs with a rectangular cross section, are required to be of various sizes (mainly widths) depending on the purpose of use. Furthermore, from the viewpoint of productivity, it is required to simultaneously form ingots of different sizes by multiple casting.

However, in the case of the coils in the conventional multiple electromagnetic field casting apparatus as described above, the shape of the coil in each casting unit is set fixedly, and the coils in the plurality of casting units are integrally formed. Therefore, in order to meet the demand, it is necessary to form or provide coils of various sizes.Furthermore, when considering the case where ingots of different sizes are simultaneously formed by multiple casting, it is necessary to form or provide coils of various sizes. Because of the large size, it was necessary to manufacture new coils for each manufacturing purpose.

And for that purpose, in the case of conventional equipment,
When forming ingots of different sizes, it is necessary to replace the coil, which not only makes the casting work troublesome, but also
Providing coils of various sizes is uneconomical and has the problem of increasing casting costs.

Furthermore, in the conventional multi-unit electromagnetic field casting apparatus as described above, since the coils in each casting unit are connected in series, it is difficult to interrupt the pouring or melt in one of the multiple casting units. If such a catastrophe occurs, the impedance of the coil will change, greatly affecting the strength of the electromagnetic field in other casting units, and the control of current and other conditions in the event of such a catastrophe. Because it is extremely difficult to perform stable operation, there are also inherent problems such as the shape of the resulting ingot becoming unstable.

(Solution Means) Here, the present invention has been made against the background of the above-mentioned circumstances, and its feature is that a predetermined molten metal is held in a column shape by an electromagnetic field generated by a coil. In a multi-equipment electromagnetic field casting device, which is equipped with a plurality of casting units that continuously cool and solidify in the vertical direction while simultaneously forming a plurality of ingots continuously and simultaneously. , the coil is located between a pair of long sides disposed opposite to each other and inner wall surfaces of the pair of long sides opposite to each other in each of the casting units, and the coils are positioned opposite to each other in the longitudinal direction. By electrically connecting the corresponding ends of the long side and the short side with a flexible connecting member, a rectangular shape can be formed. It is configured to have a frame shape, the pair of short sides are movable in opposite directions, and power feeding means is provided that can independently feed power to the coils of the plurality of casting units. That's true.

(Effects of the Invention) Therefore, in the multiple electromagnetic field casting apparatus having the structure according to the present invention, the coils are provided independently in each casting unit, and
By moving the pair of short sides that make up each coil in opposite directions, the shape (width) of the molten metal column is maintained by the electromagnetic field generated by the coil.
can be changed and set as appropriate, making it possible to form ingots with different cross-sectional shapes without replacing the coils, thereby effectively facilitating casting work and reducing casting costs. You will get it.

Furthermore, in such a multi-unit electromagnetic field casting apparatus, power is supplied to the coils of each casting unit independently, so that even if an abnormality occurs in one of the casting units in the multiple unit, , the influence on the strength of the electromagnetic field in other casting units can be effectively reduced, and thereby the operation can be effectively stabilized.

(Example) In order to clarify the present invention more specifically, an example having a structure according to the present invention will be described in detail below with reference to the drawings.

First, FIG. 1 shows a plurality of coils 10 in a multiple electromagnetic field casting apparatus having a structure according to the present invention.
It is shown. As is well known, for example, as shown in FIG. 2, these coils 10 are connected to the bottom of a casting trough 12 into which a predetermined molten metal such as aluminum or its alloy is guided and accommodated. The molten metal is supplied onto the bottom 16 through the nozzle 14 provided on the bottom 16, and around the molten metal column 18 formed thereon,
They are arranged below and along the casting trough 12 so as to be located respectively.

The electromagnetic force generated by energizing these coils 10 holds each molten metal column 18 in a shape (rectangular cross-sectional shape) corresponding to the coil 10. However, a known cooling water jacket is provided around each molten metal column 18, either integrally with the coil 10 or separately, and the molten metal column is cooled by cooling water discharged from the cooling water jacket. By lowering the base 16 while cooling and solidifying (solidifying) the ingots 18, the produced ingots 40 are continuously pulled downward, thereby performing continuous casting operations for a plurality of ingots 40 at the same time. This is how it has become.

Here, as is clear from FIG. 1, each coil 10 is formed around each molten metal column 18 to have a structure independent of other coils 10. More specifically, each coil 10 includes a pair of rectangular plate-shaped long sides 20, 20 fixedly arranged facing each other so as to be substantially parallel to each other; A pair of short sides 2 having substantially the same cross-sectional shape as the long sides 20, located between the opposing inner wall surfaces of the long sides 20 and facing each other in the longitudinal direction so as to be substantially parallel to each other.
2 and 22, the frame has a rectangular frame shape as a whole.

The pair of short sides 22 , 22 are movable in opposite directions on one plane, that is, in the longitudinal direction of the long side 20 . Therefore, as described above, the length in the width direction of the coil 10 having a rectangular frame shape can be changed and set. Note that as the material for these long side portions 20 and short side portions 22, any material similar to the conventional coil forming material can be used, and a conductive material such as copper is preferably used.

Moreover, one of the short sides 22 has an insulating layer 24 interposed in its center, so that
In the parts that are electrically insulated and located on both sides with the insulating layer 24 in between,
Power supply busbars 26, 26 are integrally provided.

Furthermore, both end portions in the longitudinal direction of each long side portion 20 and the corresponding short side portions 22
In other words, in the above arrangement, the long side 20 and the short side 22
A jumper 28 as a flexible connecting member is provided between the adjacent end portions, respectively.
Each end thereof is electrically connected by the jumper 28. As a result, the pair of long sides 20, 20 and the pair of short sides 22, 22 form a rectangular frame-shaped coil 1.
0 is configured. The jumper 28 has appropriate flexibility and can allow the short sides 22, 22 to move in the opposite directions as described above, and also allows the long sides 20 and 22 to be electrically connected. Any material can be used as long as it can be maintained in a connected state, and wire-shaped members made of conductive material such as copper or plate-shaped members can be suitably used. be.

Furthermore, as shown in FIG. 1, each coil 10 having such a structure is provided with an independent power supply 30, and a matching transformer 32 is connected to the coil 10 from these power supplies 30. , a high frequency current is guided to the power supply busbars 26, 26 of each coil 10 through a power supply cable 34. That is, in the case of the plurality of coils 10 in this embodiment, each of the other coils 1
It is equipped with a power supply and a power supply circuit independent of the 0. Then, a high frequency current is supplied to each coil 10 through the power supply busbars 26, 26, thereby causing the molten metal (molten metal column 1) to be supplied onto the base 16 as described above.
8) A predetermined electromagnetic force is applied to the
The shape of the molten metal column 18 can be controlled or maintained until it solidifies.

Note that the operation of the plurality of power supplies 30 that supply power to each coil 10 is controlled by a control device 36, so that the current supplied to each coil 10 is controlled by the molten metal. It is designed to be able to be controlled independently according to changes in level, etc.

Therefore, in the multiple electromagnetic field casting apparatus of this embodiment having the structure as described above, the width direction dimension of each coil 10 can be changed and set, so that the coil 10 can be changed without replacing the coil 10. It is possible to change the cross-sectional shape of the obtained ingot, and by appropriately setting the shape of each coil 10, it is possible to simultaneously cast a plurality of ingots having different desired cross-sectional shapes. Because of this, it is possible to easily cast ingots of various shapes depending on the purpose of use, etc., thereby facilitating the casting work and effectively reducing casting costs. be.

In addition, in such a casting apparatus, since each coil 10 is equipped with an independent power supply circuit, even if an abnormality such as a water leak occurs in one casting unit in the multiple installation, other The strength of the electromagnetic field in one casting unit is not significantly affected, so even if some unexpected accident occurs in another casting unit, casting can continue stably. This is because it becomes possible to do so.

Furthermore, in the casting apparatus of this embodiment, an independent power supply 30 is provided for each coil 10, and since the high frequency currents supplied are not in the same phase, each coil 10
It also has the advantage that electrical influence (magnetic field interference) from other casting units (coil 10) can be more effectively avoided as long as the power supply to the coil 10 is properly controlled. It is.

In the case of such a casting apparatus, the power supply to or stopping of one coil 10 during multiple mounting does not have a large effect on the strength of the electromagnetic field generated by the other coils 10. It is possible to cast a desired number of ingots using some of the casting units without using all of the casting units; It is also possible to cast the respective ingots 40 with different lengths, as shown in FIG.

Furthermore, in the casting apparatus according to the present embodiment, since the control device 36 controls the power supply to each coil 10 independently, it is possible to control the power supply to each coil 10 independently. Compared to a system in which coils are connected in series, more detailed control can be effectively performed depending on the level of the molten metal in each molten metal column 18, etc.

Furthermore, since the coils 10 in each casting unit are independent of each other, such a casting apparatus has the advantage that the number of stations can be easily expanded.

Although one embodiment of a multi-unit electromagnetic field casting device having a structure according to the present invention has been described in detail above, this is a literal illustration, and the present invention is to be construed as being limited only to this specific example. isn't it.

For example, in the casting apparatus in the above embodiment, the coil 10 in each casting unit is
Although a power source 30 was provided for each, it is also possible to supply power from a single power source through an independent electric circuit.

Further, in the above embodiment, each coil 10 was composed of long side portions 20, 20 and short side portions 22, 22 having the same shape, but the coil 10 in each casting unit was Of course, it is also possible to continuously cast ingots into different shapes at the same time by replacing them and changing the shape of the long side portion 20 or the short side portion 22.

Although not listed in detail, the present invention may be implemented in various modifications, modifications, improvements, etc. based on the knowledge of those skilled in the art, and such embodiments may be implemented without departing from the spirit of the present invention. It goes without saying that any of these are included within the scope of the present invention as long as they do not deviate from the above.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram for explaining a coil and a power supply means for the coil in a multiple electromagnetic field casting apparatus structured according to the present invention, and FIG.
The figure is an explanatory view showing the arrangement of such a coil in a casting apparatus. 10... Coil, 12... Casting gutter, 18... Molten metal column,
20... Long side part, 22... Short side part, 24... Insulating layer, 2
8... jumper, 30... power supply, 36... control device, 4
0...Ingot.

Claims (1)

[Scope of Claims] 1. A casting unit comprising a plurality of casting units in which a predetermined molten metal is held in a columnar shape by an electromagnetic field generated by a coil, and continuously cooled and solidified in the vertical direction. In a multiple electromagnetic field casting apparatus capable of continuously and simultaneously forming a plurality of ingots, the coil is arranged in each of the casting units to have a pair of long sides disposed opposite to each other;
A pair of short sides are located between the opposing inner wall surfaces of the pair of long sides, and are arranged opposite to each other in the longitudinal direction. By electrically connecting the corresponding ends with a flexible connecting member, it is configured to have a rectangular frame shape, and the pair of short sides can be moved in opposite directions. A multi-equipped electromagnetic field casting apparatus, further comprising a power supply means capable of independently supplying power to the coils of the plurality of casting units.