JP3351919B2 - Flow controller for molten metal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control device for adjusting the flow of molten metal in a mold.

[0002]

2. Description of the Related Art In continuous casting, for example, molten steel is poured into a mold from a tundish, and the molten steel is drawn from the mold wall while being gradually cooled. Powder is introduced to improve the slip of the solidified metal against the mold wall surface. However, when the powder is rolled into the molten metal, the slab surface cracks and shell rupture are likely to occur. In addition, if the temperatures on the mold wall surfaces at the same height are not uniform, the components of the slab become uneven and the quality is reduced. Therefore, conventionally, a molten steel is flow-driven along a wall surface of a mold in a mold by using a linear motor in parallel with the upper surface thereof (for example, Japanese Patent Application Laid-Open No. 1-228645).

Although the flow driving of molten steel disclosed in Japanese Patent Application Laid-Open No. 1-228645 has a certain effect, the circulating flow along the mold wall surface is disturbed by the flow of molten steel flowing into the tundish through the injection nozzle. . In other words, when the molten steel flows from the nozzle into the mold in two directions, the molten steel flows toward the left and right short pieces and slightly toward the depth direction of the molten steel, and the molten steel flows in the short side direction of the mold and slightly in the depth direction of the molten steel. A flow (protruding flow) is generated, which flows on the short side of the mold, and flows partially upward and downward (in the depth direction), and the molten steel flow flowing upward generates a surface flow from the short piece toward the nozzle. When molten steel is flowing symmetrically from the nozzle toward both short sides at the same angle and the same flow velocity, the left and right surface flows are approximately symmetric with respect to the nozzle, but the two-way symmetry is lost due to nozzle clogging and the like. When the outflow direction of the molten steel is deviated to the long side, the symmetry of the left and right surface flows with respect to the nozzle is broken, a swirling flow is generated, and the powder on the meniscus is easily entrained. On the other hand, when molten steel changes to a solid, gas (bubbles) such as CO
Occurs. In addition, if the molten steel stays in a part of the inner surface of the mold, the powder tends to remain in the molten steel, and it is easy to cause seizure which causes breakout. Conventionally, in order to prevent such a problem, for such a flow drive, the molten steel flow flowing out of the nozzle into the mold or the resulting surface flow is arranged along the long side of the mold so as to sandwich the flow from the outside of the mold wall. Linear motor in which an electric coil is wound around each of a plurality of magnetic poles
A pair of electromagnets is arranged. The electric coils of the electromagnet are bundled for each of the three phases, connected to the respective phases of the three-phase power supply with a phase shift of 120 ° in a bundled unit, and the voltage and / or frequency of the three-phase power supply are inverted. And a cycloconverter to obtain the required driving force and speed. As a result, an electromagnetic driving force is applied to the molten steel to generate a stable static flow along the inner wall of the mold on the surface layer of the molten steel. When the circulating flow along the inner wall of the mold flows stably at a constant speed on the surface layer, the floating of bubbles is promoted, powder is not entrained in the molten steel, the inner surface of the mold near the surface layer is wiped clean, and the stagnation of the molten steel is eliminated .

[0004] The above-mentioned method aims at stabilizing only the surface flow, and controls only the surface flow on the meniscus surface, and attempts to correct the strength and unbalance of the protruding flow from the injection nozzle. In this case, the electromagnetic force in the depth direction of the mold is insufficient. Therefore, Japanese Patent Application Laid-Open No. 59-70
In Japanese Patent No. 445, a slot of an electromagnet is provided obliquely to a drawing direction of molten steel, so that a strong electromagnetic force is exerted also in a depth direction of a mold. Further, Japanese Patent Application Laid-Open No. 58-100954 proposes an electromagnet capable of changing the mounting direction of the electromagnet so that the direction of the coil changes by 90 degrees. Trying to get.

[0005]

However, Japanese Unexamined Patent Publication No.
In Japanese Patent No. 70445, a slit cut into an iron core is fixed in a hard manner, and it is impossible to change the direction. It is also impossible to change direction, depending on the situation and the state of imbalance). In addition, Japanese Unexamined Patent Publication No.
In the method of JP-A-8-100954, only one of a direction along the long side of the mold and a depth direction of the mold can be selected, and the direction along the long side of the mold or the depth direction of the mold can be selected. Since two-dimensional control with an inclination cannot be performed, there is a problem that it is not possible to cope with a complicated casting situation.

A first object of the present invention is to provide a flow control device capable of adjusting the flow direction and velocity of molten metal in a mold in a two-dimensional direction, and to improve the degree of freedom of adjustment. The purpose of.

[0007]

Flow control apparatus for molten metal SUMMARY OF THE INVENTION The present invention, in the mold (1) surrounding the molten metal (MM), horizontal
x, 2-dimensional x vertical z, along one of the mold sides to have spread in the z direction (5F), x, plurality is distributed to each of the z-direction, wherein the y direction orthogonal x, z directions A plurality of magnetic poles facing the mold side; a plurality of electric coils (CL1 to CL6, CL7 to CL12) for exciting the magnetic poles;
L1 to CL6), x drive energizing means (VC3, SW3, x3) for energizing the magnetic pole to apply a moving magnetic field in the x direction to the molten metal in the mold.
VC4, SW4); and z drive energizing means (VC5, SW5, VC6, SW64) for energizing the electric coils (CL7 to CL12) so that the magnetic poles apply a moving magnetic field in the z direction to the molten metal in the mold. wherein the magnetic pole has a plurality of distribution in the z-direction extends in x-direction
Slots and a plurality of slots extending in the z direction and distributed in the x direction.
Between the above slots of the magnetic core (4L) having a slot
The electric coil is a slot distributed in the x direction.
Pairs (CL1 to CL6) distributed in the x direction inserted in the
Pairs distributed in the z direction inserted into slots distributed in the
(CL7 to CL12); x drive energizing means (VC3, SW3, VC4, SW4)
Energizes a set of electric coils (CL1 to CL6) distributed in the x direction
Z drive energizing means (VC5, SW5, VC6, SW64)
Energizing the set of electric coils (CL7 to CL12);
Features.

[0008] In the parentheses, for easy understanding, reference numerals of corresponding elements in the embodiments described later are added for reference.

[0009]

The molten metal is moved by the moving magnetic fields in the x and z directions.
When the thrust applied to (MM) is referred to as x-direction thrust and z-direction thrust, respectively, x drive energizing means (VC3, SW3, VC4, SW4) and z drive energizing means (VC5, SW5, VC6, SW64) When the thrusts in the x and z directions having the same value are generated,
From the first quadrant divided by the x and z axes to the third quadrant,
A combined thrust in a direction inclined at 45 degrees with respect to the x and z axes is applied to the molten metal (MM). When the x-direction thrust by the x-drive energizing means is reduced, the direction of the combined thrust approaches the z-direction. When the z-direction thrust by the z-drive energizing means is reduced, the direction of the combined thrust approaches the x-direction. A resultant thrust in the direction of degree (first quadrant) is obtained. When the direction of the moving magnetic field is reversed by the z-drive energizing means, a combined thrust in the direction of 90 to 180 degrees (second quadrant) is obtained. 2
A combined thrust in the direction of 70 degrees (third quadrant) is obtained, and when the directions of the moving magnetic fields in the respective directions are reversed by the z drive energizing means and the x drive energizing means, 270 to 3 with respect to the x axis.
A combined thrust in the direction of 60 degrees (fourth quadrant) is obtained.

Therefore, on the x and z planes, a combined thrust in a direction of 0 to 360 relative to one axis (for example, the x axis), that is, an arbitrary direction can be obtained, and the flow direction and speed of the molten metal can be increased. It can be adjusted with any degree of freedom.

[0011] The thrust applied to the molten metal (MM) by removing the electric coil and mechanically rotating the electromagnet by adjusting the energization level by the x-drive energizing means and the z-drive energizing means and / or by switching the direction of the moving magnetic field. Since the strength and / or direction of the (combined thrust) can be arbitrarily set, the flow of the molten metal (MM) can be finely adjusted.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

[0013]

FIG. 1 shows the appearance of a mold part according to an embodiment of the present invention. Molten steel MM is injected through a pouring nozzle 21 into a space surrounded by the inner wall 1 of the continuous casting mold. The inner wall 1 of the mold is cooled by cooling water flowing through a water box (not shown).
M gradually hardens from the surface in contact with the mold to the inside and the slab is continuously pulled out. However, since molten steel is poured into the inner wall 1 of the mold by the pouring nozzle 21, there is always molten steel MM in the mold. . Two linear motors 3F and 3L are opposed to these long sides so as to sandwich the long sides 5L and 5F of the mold.
These provide a moving magnetic field to the molten steel MM in the mold.

FIG. 2 is a perspective view showing the appearance of the linear motor 3L shown in FIG. The linear motor 3L includes an electromagnet core 4L and electric coils CL1 to CL12. The electromagnet core 4L is cut into six slots extending in the x direction and distributed in the z direction and six slots extending in the z direction and distributed in the x direction. Each of the electric coils CL1 to CL6 is inserted into six slots distributed in the x direction of the electromagnet core 4L, and the electric coils CL7 to CL
Each of L12 is inserted in each of six slots distributed in the z direction of the electromagnet core 4L. Therefore, two sets of electric coils CL1 to CL6 and CL7 to CL12
And cross each other in the slot.

FIG. 3 shows that the inner wall 1 shown in FIG.
2 shows a cross section (cross section taken along line z3-z3 in FIG. 1) of the electromagnet cores 4F and 4L of the rotors 3F and 3L.

Referring to FIGS. 1 and 3, the inner wall 1 of the mold is composed of opposing long sides 5F, 5L and opposing short sides 6R, 6L. The backing of the board. In this example,
In the electromagnet core 4F of the linear motor 3F, six slots having the same depth (length in the y direction) are cut at a predetermined pitch in the horizontal direction x and over the entire length in the slab drawing direction z. These slots have # 1 group electric coil CF4
To # 6 and # 2 group of electric coils CF1 to CF
3 is attached. Similarly, in the electromagnet core 4L of the linear motor 3L, six slots having the same depth (length in the y direction) are cut at a predetermined pitch in the horizontal direction x and over the entire length in the slab drawing direction z. ing. These slots have #
The three groups of electric coils CL1 to CL3 and the # 4 group of electric coils CL4 to CL5 are mounted, and the linear motors 3F and 3L have long sides 5F to which the molten steel MM contacts.
A moving magnetic field in the x direction (thrust in molten steel in the x direction) is generated along 5L.

FIG. 4 shows that the inner wall 1 shown in FIG.
2 shows a cross section (cross section taken along line x4-x4 in FIG. 1) of the electromagnet cores 4F and 4L of the rotors 3F and 3L.

Referring to FIG. 4, in the electromagnet core 4F of the linear motor 3F, six slots having the same depth (length in the y direction) are provided at a predetermined pitch in the slab drawing direction z and in the horizontal direction x. It is cut over the entire length. These slots are equipped with # 7 group electric coils CF10 to CF12 and # 8 group electric coils CF7 to CF9. Similarly, in the electromagnet core 4L of the linear motor 3L, six slots having the same depth (length in the y direction) are cut at a predetermined pitch in the slab drawing direction z and over the entire length in the horizontal direction x. ing. In these slots, # 5 group electric coils CL7 to CL9 and # 6 group electric coils CL10 to CL12 are mounted, and linear motors 3F and 3L have a long side 5F to which molten steel MM contacts. , 5L moving magnetic field along z direction (thrust in molten steel against z direction)
Occurs.

That is, the linear motors 3F and 3L are to apply the above-described thrust in the x direction and the thrust in the z direction to the molten steel MM. Each electric coil group # 1
The thrust strength in the x-direction and z-direction is determined by adjusting the current level in # 8, and the direction of the thrust in the x-direction and z-direction is reversed by switching the order of the energization phase in the group. Complex flow (velocity distribution) of molten steel MM poured from pouring nozzle 21 by adjusting the current level and switching the conduction phase order
Can be commutated to the desired one. The configuration and operation for that will be described below.

FIG. 5 shows a system configuration for energizing the electric coil groups # 1, # 2, # 3 and # 4 shown in FIG. 3 in this embodiment, and FIG.
1 shows the connections within the group of the electric coils # 1, # 2, # 3 and # 4. Referring to FIG. 5, the linear motors 3F, 3L
Of electric coil groups # 1, # 2, # 3, and # 4 generate power supply circuits VC1 and VC that generate three-phase AC voltages via changeover switches SW1, SW2, SW3, and SW4, respectively.
2, VC3 and VC4. The connection shown in FIG. 7 is for one group and one pole (N = 1).
A three-phase alternating current (M = 3) is supplied to the electric coil of the pump. For example, the electric coil CF of the # 1 group of the linear motor 3F
4 to CF6 are represented as W, v, U in this order in FIG. "U" indicates the U-phase positive-phase energization of three-phase alternating current (energization as it is), and means that the U-phase is applied to the electric coil "U" at the winding start end. Similarly, "V"
Is the V-phase positive-phase current of the three-phase AC, and “W” is the three-phase AC W
Indicates the positive phase energization of a phase. “U”, “v”, and “w” mean that the phases are opposite to the U, V, and W phases, respectively, and that the U, V, and W phases are respectively applied to the winding end.

The terminals U1, V1 and W1 shown in FIG.
Electric coil CF4 of # 1 group of linear motor 3F ~
Power connection terminal for CF6, terminals U2, V2 and W
2 is an electric coil C of the # 2 group of the linear motor 3F.
Terminals U3, V3 and W3 are power connection terminals of the # 1 group electric coils CL1 to CL3 of the linear motor 3L, and terminals U4 and F3.
V4 and W4 are power supply connection terminals of the # 4 group electric coils CL4 to CL6 of the linear motor 3L. In this embodiment, the linear motor 3F and the linear motor 3
In order to increase the magnetic flux density mainly near the inner surface of the long side and to enhance the wiping effect of the inner surface, the opposing coils of L have the same polarity (the opposite pole tip surfaces have the same polarity at the same time). It is connected to. When the magnetic flux density at the center of the mold space is increased to mainly control the jet flow from the nozzle, the wires are connected so as to have different polarities (the opposite pole faces have opposite polarities at the same time). I do.

The electric coils CF4 to CF6 of the # 1 group of the linear motor 3F are connected to a power supply circuit VC1 for generating a three-phase AC voltage via a switching relay switch SW1. As shown in FIG. 5, the switch SW1 is
A state where the relay coil is energized (this is called SW1: O
N), an electric coil CF4 is supplied from a power supply circuit VC1.
ＣＦCF6 are supplied with a U-phase of three-phase AC, a power terminal V1 is supplied with a V-phase of three-phase AC, and a power terminal W1 is supplied with a W-phase of three-phase AC. Therefore, each of the electric coils CF4 to CF6 of the # 1 group applies a moving magnetic field to the molten steel MM toward the paper surface and toward the right in the x direction, as shown by the solid line arrow in FIG. Thrust is added. Switch SW1 relay
The state where the power supply to the coil is cut off (this is called SW1: OF
F), the connection between the power supply terminals V1 and W1 is exchanged with respect to the V-phase output and the W-phase output of the power supply circuit VC1, and the three-phase AC W-phase is supplied to the power supply terminal V1.
Since the V phase of the three-phase alternating current is supplied to the power supply terminal W1,
Each group of electric coils CF4 to CF6 is made of molten steel MM.
5, a moving magnetic field which is opposite to the solid line arrow shown in FIG. 5 and is directed leftward in the x direction toward the paper surface is applied, whereby a thrust in the direction is applied to the molten steel MM.

Similarly, each of the electric coils CF1 to CF3 of the # 2 group of the linear motor 3F is connected to a power supply circuit VC2 for generating a three-phase AC voltage via a switching relay switch SW2.
It is connected to the. When SW2 is ON, a three-phase AC U-phase is supplied to the power terminals U2 of the electric coils CF1 to CF3 from the power circuit VC, a three-phase AC V-phase is supplied to the power terminal V2, and the power terminal W2 is supplied. Has three-phase AC
Phase, so that each electric coil CF of the # 2 group
1 to CF3 apply a moving magnetic field toward the paper surface and to the right in the x direction as shown by solid arrows in FIGS. 5 and 7 to the molten steel MM, thereby applying a thrust in the molten steel MM in the direction. When SW2 is OFF, the voltage of the power supply circuit VC2
The connections of the power terminals V2 and W2 are exchanged for the phase output and the W-phase output, and the power terminal V2 is supplied with the three-phase AC W phase, and the power terminal W2 is supplied with the three-phase AC V phase. Supplied, the electric coils CF1 to C2 of the # 2 group
F3 applies a moving magnetic field to the molten steel MM, which is opposite to the solid arrow shown in FIGS. 5 and 7 and is directed leftward in the x direction toward the paper surface, whereby a thrust in the direction is applied to the molten steel MM.

On the other hand, each of the electric coils CL1 to CL3 of the # 3 group of the linear motor 3L is connected to a switching relay switch S.
The electric coils CL4 to CL6 of the # 4 group of the linear motor 3L are connected to a power supply circuit VC3 for generating a three-phase AC voltage via W3, and a power supply for generating a three-phase AC voltage via a switching relay switch SW4. The circuit VC4 is connected. The switches SW3 and SW4 perform the same operation as the switches SW1 and SW2. When the switch SW3 is ON, the power supply terminals U3, V3 and W3 are connected to the power supply circuit VC3 by 3 respectively.
The U-phase, V-phase, and W-phase of phase exchange are supplied, and a moving magnetic field in the right direction in the x direction indicated by a solid line arrow in FIGS. 5 and 7 is applied to the molten steel MM, whereby a thrust in the directions is applied to the molten steel MM. .
When SW3 is OFF, the U-phase, W-phase, and V-phase of three-phase AC are supplied from the power supply circuit VC4 to the power supply terminals U3, V3, and W3, respectively, and the solid line arrows in FIGS. A moving magnetic field to the left in the x direction opposite to the direction is applied, whereby a thrust in the direction is applied to the molten steel MM. Also, SW
4: When ON, the power terminals U4, V4 and W4 respectively
The U-phase, V-phase, and W-phase of three-phase alternating current are supplied from the power supply circuit VC4, and a moving magnetic field in the right direction in the x direction indicated by a solid line arrow in FIGS. 5 and 7 is applied to the molten steel MM. Thrust in direction is applied. When SW4 is OFF, the power supply terminal U
4, V4, and W4, respectively, are supplied with three-phase alternating current U, W, and V phases from a power supply circuit VC4, and the left side of the molten steel MM in the x direction opposite to the direction indicated by the solid arrow in FIGS. Is applied, whereby a thrust in the direction is applied to the molten steel MM. FIG. 10A shows the phase output of the three-phase alternating current supplied to the electric coil and the direction of the thrust given to the molten steel MM when the switch SW1 and the switch SW4 are ON and the switches SW2 and SW3 are OFF. Show,
In (b), the switches SW1 and SW4 are turned off.
F indicates the phase output of the three-phase alternating current supplied to the electric coil when the switches SW2 and SW3 are ON, and the direction of the thrust applied to the molten steel MM.

FIG. 6 shows a system configuration for energizing the electric coil groups # 5, # 6, # 7, and # 8 shown in FIG. 4 in this embodiment, and FIG.
5 shows connections in the groups of electric coils # 5, # 6, # 7 and # 8. The electric coil groups # 5, # 6, # 7, # 8 of the linear motors 3F, 3L are connected to the changeover switches SW4, S
They are connected to power supply circuits VC5, VC6, VC7, and VC8 that generate three-phase AC voltages via W5, SW7, and SW8, respectively. The connection shown in FIG. 8 has one pole (N = 1), and a three-phase alternating current (M = 3) is supplied to the electric coil.

Each of the electric coils CF10 to CF12 of the # 7 group of the linear motor 3F is provided with a switching relay switch SW.
7 is connected to a power supply circuit VC7 for generating a three-phase AC voltage. As shown in FIG. 6, the switch SW7
However, when the relay coil is energized (this is called SW
7: ON), a three-phase AC U-phase is supplied from a power supply circuit VC7 to a power supply terminal U7 of the electric coils CF10 to CF12, and a three-phase AC V-phase is supplied to a power supply terminal V7. Since the three-phase AC W-phase is supplied to the power supply terminal W7, the electric coils CF10 to C7 of the # 7 group are
As shown by the solid line arrow in FIG. 6, F12 applies a moving magnetic field toward the paper surface and toward the right in the x direction to the molten steel MM, whereby a thrust in the direction is applied to the molten steel MM. Switch S
In a state where the power supply to the relay coil of W7 is cut off (this is referred to as SW7: OFF), the connection between the power terminals V7 and W7 is exchanged for the V-phase output and W-phase output of the power circuit VC7, and the power terminal V7 is supplied with the W phase of the three-phase AC, and the power terminal W7 is supplied with the V phase of the three-phase AC. Therefore, the electric coils CF10 to CF1 of the # 7 group are provided.
2 gives a moving magnetic field to the molten steel MM, which is opposite to the solid line arrow shown in FIG. 6 and is directed left in the x direction toward the paper surface, whereby a thrust in the direction is applied to the molten steel MM.

Similarly, the electric coils CF7 to CF9 of the # 8 group of the linear motor 3F are connected to a power supply circuit VC8 for generating a three-phase AC voltage via a switching relay switch SW8.
It is connected to the. SW8: When ON, the three-phase AC U-phase is supplied to the power terminals U8 of the electric coils CF7 to CF9 from the power circuit VC, the three-phase AC V-phase is supplied to the power terminal V8, and the power terminal W8 is supplied. Has three-phase AC
Phase, so that each electric coil CF of the # 8 group
7 to CF9 apply a moving magnetic field toward the paper surface and to the right in the x direction as shown by solid arrows in FIGS. 6 and 8 to the molten steel MM, and thereby a thrust in the direction is applied to the molten steel MM. And, when SW8: OFF, V of the power supply circuit VC8
The connections of the power terminals V8 and W8 are exchanged for the phase output and the W-phase output, so that the power terminal V8 is supplied with the three-phase AC W phase, and the power terminal W8 is supplied with the three-phase AC V phase. Supplied, the electric coils CF7 to C of the # 8 group
F9 applies a moving magnetic field to the molten steel MM, which is opposite to the solid arrows shown in FIGS. 6 and 8 and is directed left in the x direction toward the paper surface, whereby a thrust in the direction is applied to the molten steel MM.

On the other hand, the electric coils CL7 to CL9 of the # 5 group of the linear motor 3L are
The electric coils CL10 to CL12 of the # 6 group of the linear motor 3L are connected to a power supply circuit VC5 for generating a three-phase AC voltage via W5.
Is connected to a power supply circuit VC6 that generates a three-phase AC voltage. Switches SW5 and SW6 are SW7 and S
It performs the same movement as W8, and when SW5: ON,
A power supply circuit VC5 is connected to the power supply terminals U5, V5, and W5, respectively.
U-phase, V-phase and W-phase of three-phase AC are supplied from the
6 and 8, a moving magnetic field in the right direction in the x direction indicated by the solid arrow is applied, whereby a thrust in the direction is applied to the molten steel MM. SW5: When OFF, power supply terminals U5, V5, W5
Respectively, U-phase and W-phase of three-phase AC from the power supply circuit VC5.
Phase and V-phase are supplied, and a moving magnetic field to the left in the x direction opposite to the direction indicated by the solid line arrow in FIGS. 6 and 8 is applied to the molten steel MM, whereby a thrust in the direction is applied to the molten steel MM. When SW6 is ON, the power terminals U6, V6, and W6 are supplied to the power circuit VC6 from the U-phase, V-phase, and W-phase of three-phase AC, respectively.
The phase is supplied, and a moving magnetic field to the right in the x direction shown by the solid arrow in FIGS. 6 and 8 is applied to the molten steel MM, whereby a thrust in the direction is applied to the molten steel MM. When SW6 is OFF, the U-phase, W-phase, and V-phase of three-phase AC are supplied from the power supply circuit VC6 to the power supply terminals U6, V6, and W6, respectively, and the molten steel MM is indicated by solid arrows in FIGS. X opposite to direction
A moving magnetic field in the left direction is applied, and a thrust in the direction is applied to the molten steel MM.

FIG. 11A shows the phase output of the three-phase alternating current supplied to the electric coil when the switches SW5 and SW8 are ON and the switches SW6 and SW7 are OFF and the thrust given to the molten steel MM. (B), the switch SW8 and the switch SW5 are OFF and the switch SW6 and the switch SW7 are OFF.
It shows the phase output of the three-phase alternating current supplied to the electric coil when N and the direction of the thrust given to the molten steel MM. In both (a) and (b), the opposing coils (the electric coil groups # 1 and # 4 and the electric coil groups # 2 and # 3) have the same polarity. A force is applied from the top and bottom in the direction along the mold inner wall 1 toward the center of the mold, and (b) shows a force applied to the molten steel MM from the center of the mold to the top and bottom in the direction along the mold inner wall 1. I have. When the opposite coils (electric coil groups # 5 and # 8 and electric coil groups # 6 and # 7) have different polarities, possible thrust patterns are not limited to this.

FIG. 9 shows a configuration of a power supply circuit VC1 for supplying three-phase alternating current to the electric coils CF4 to CF6 of the electric coil group # 1 of the linear motor 3F. 3-phase AC power supply (3-phase power line)
A thyristor bridge 12 for DC rectification is connected to 11, and its output (pulsating current) is smoothed by an inductor 13 and a capacitor 14. The smoothed DC voltage is applied to a power transistor bridge 15 for forming a three-phase AC, and the U-phase of the three-phase AC output from the power transistor bridge 15 is turned on / off via a switching relay switch SW1 shown in FIG. Instead, it is supplied to the power supply connection terminal U1. Switch S
When W1 is ON, the V-phase of the three-phase AC is connected to the power connection terminal V1.
Then, the W phase is applied to the power supply connection terminal W1. When the switch SW1 is OFF, the W phase of the three-phase AC is applied to the power connection terminal V1, and the V phase is applied to the power connection terminal W1.

Each electric coil CF4 of the linear motor 3F
A predetermined coil voltage command value Vc1 given to CF6 is given to phase angle α calculator 16, and phase angle α calculator 16
The conduction phase angle α (thyristor trigger-phase angle) corresponding to the command value Vc1 is calculated, and a signal representing this is given to the gate driver 17. The gate driver 17 starts the phase counting of the thyristor of each phase from the zero cross point of each phase and triggers conduction at the phase angle α. As a result, the DC voltage indicated by the command value Vc1 is applied to the transistor bridge 15.

On the other hand, the three-phase signal generator 18 generates a constant-voltage three-phase AC signal having a frequency specified by the frequency command value fc and supplies the signal to the comparator 19. A triangular wave generator 21 also provides a constant voltage triangular wave having a frequency of 3 kHz to the comparator 19. When the level of the U-phase signal is positive, the comparator 19
When it is higher than the level of the triangular wave provided by the triangular wave generator 18, the signal of the high level H (transistor on) and when it is lower than the level of the triangular wave, the signal of the low level L (transistor off) is transmitted to the U-phase positive section (0 to 180 degrees) ) To the gate driver 20 (to the U-phase positive voltage output transistor). When the level of the U-phase signal is negative, when the level of the U-phase signal is equal to or lower than the level of the triangular wave provided by the triangular wave generator 21, the high level H is output.
Then, when the level of the triangular wave is exceeded, a low level L signal is
The signal is output to the gate driver 20 in the negative section of the U-phase (180 to 360 degrees) (in the direction of the U-phase negative voltage output transistor). The same applies to the V-phase signal and the W-phase signal. The gate driver 20 turns on and off the transistors of the transistor bridge 15 in response to the signals for each phase, positive and negative sections.

Thus, a three-phase AC U-phase voltage is output to the power supply connection terminal U1, and a three-phase AC V-phase voltage is output to the power supply connection terminal V1 and the power supply connection terminal W1 by turning on / off each switch SW1. Alternatively, W-phase voltages are output, and the levels of these voltages are determined by the coil voltage command value Vc1.
That is, a three-phase AC voltage having a voltage value designated by the coil voltage command value Vc1 is applied to each of the electric coils CF4 to CF6 of the linear motors 3F and 3L shown in FIGS. The configurations and operations of the power supply circuits VC2 to VC8 for energizing the electric coils of the other electric coil groups # 2 to # 8 are the same as those of VC1. That is, the three-phase AC U-phase voltage is output to the power supply connection terminals U2 to U8 of the electric coil groups # 2 to # 8, and the power supply connection terminals V2 to V8 and the power supply connection terminals W2 to W8
8 outputs three-phase AC V-phase voltage or W-phase voltage by ON / OFF of each of the switches SW2 to SW8, and the levels of these voltages are determined by the coil voltage command values Vc to Vc8.

As described above, in this embodiment, three-phase alternating current is applied to the linear motors 3F and 3L having a single pole configuration, and the linear motors 3F and 3L apply a mold to the molten steel MM in the mold inner wall 1. A thrust by combining the thrust in the x direction and the thrust in the z direction along the inner wall 1 is applied. Since the thrust direction (pattern) can be selected by the switches SW1 to SW8, the thrust direction (pattern) corresponding to the complicated movement of the molten steel MM can be appropriately set.

Next, the thrust given to the molten steel in the mold by one linear motor 3L will be described. FIG. 12A is a plan view of the magnetic pole end surface of the linear motor 3L through the long piece 5F from the inside of the mold. In the power supply circuits VC4 and VC5,
Currents of the same level are applied to the # 4 group electric coils CL4 to CL6 and the # 5 group electric coils CL7 to CL9, respectively, in the x direction rightward (toward -x) and in the z direction upward (to + z). When the moving magnetic field is applied in the order of the phases (SW4 on, SW5 on),
2 (a), a combined thrust in the direction indicated by the thick arrow is applied to molten steel near the inner surface of the long wall 5F. When the switch SW4 is turned off, the thrust in the x direction reverses to the left as shown by the two-dot chain line arrow in FIG. 12A, so that the combined thrust also reverses to the left. As shown in FIG. 12A, when the linear motor 3L is virtually divided into four regions R1 to R4, the region R
The direction of the combined thrust in No. 1 is determined by a combination of ON / OFF of SW4 and SW5. Similarly, the direction of the combined thrust in the region R2 is determined by ON / OFF of SW3 and SW5,
The direction of the combined thrust of No. 3 is determined by ON / OFF of SW3 and SW6, and the direction of the combined thrust of the region R4 is determined by ON / OFF of SW4 and SW6. Each region R1 to SW3 to SW6 on / off combination and the linear motor 3L gives to the molten steel.
FIG. 12 shows the relationship between the direction of the combined thrust of R4 (thick arrow) and the direction.
(B), and are shown in FIGS.

The combined thrusts (thick arrows) shown in FIGS. 12 to 14 are obtained when the thrusts in the x-direction and the z-direction are made equal to each other. Make a 45 degree angle. However, for example, referring to FIG. 12A, the # 5 group of electric coils CL7
When the energization levels of Nos. To 9 are set to zero (non-energization), the resultant thrust (thick arrow) becomes the same as the x-direction thrust. That is, the angle of the combined thrust (with respect to the x axis) is zero. from now on,#
The energization level of the 5-group electric coils CL7 to 9 is gradually increased (and / or the # 4-group electric coil CL4).
When the energization level of CL6 is gradually lowered), the thrust appears in the z-direction and gradually increases.
From the # 4 group of electric coils CL4
When the energization level of CL6 is set to zero, it becomes 90 degrees (x,
Direction adjustment in the first quadrant of the z-axis coordinate). Next, SW4 is turned off to gradually lower the energization level of the # 5 group of electric coils CL7 to 9 (and / or gradually increase the energization level of the # 4 group of electric coils CL4 to CL6), and # When the energization level of the five-group electric coils CL7 to CL9 is set to zero, the angle of the resultant thrust gradually increases from 90 degrees and becomes 180 degrees (direction adjustment in the second quadrant of the x and z axis coordinates). Next, SW5 is turned off and the # 5 group is turned off.
The energization level of the electric coils CL7 to CL9 of the group is gradually increased (and / or the electric coils CL4 to CL6 of the # 4 group).
Gradually lowers the energization level), the thrust in the z direction appears and gradually increases, so that the angle of the combined thrust gradually increases from 180 degrees, and the electric coil CL4 of the # 4 group.
When the energization level of CL6 is set to zero, the angle becomes 270 degrees (direction adjustment in the third quadrant of the x and z axis coordinates). Next, SW4
Is turned on to turn on the # 5 group of electric coils CL7 to CL9.
When the energizing level of the # 4 group of electric coils CL4 to CL6 is gradually decreased (and / or the energizing level of the # 5 group of electric coils CL4 to CL6 is gradually increased) and the energizing level of the # 5 group of electric coils CL7 to 9 is zero, the resultant thrust is reduced. The angle gradually increases from 270 degrees to 360 degrees (direction adjustment in the fourth quadrant of the x and z axis coordinates).

The above is the adjustment of the direction of the resultant thrust in the region R1. Similar direction adjustment can be performed in regions R2, R3, and R4.

In the embodiment described above, the four regions R1 to R1
Although the direction and strength of the combined thrust of each of R4 can be adjusted, since each electric coil is common to the two regions, it cannot be independently adjusted in each of regions R1 to R4. If independent adjustment is required, each coil is split into two. That is, 4 corresponding to the regions R1 to R4, respectively.
Linear motors.

In the embodiment described above, the region R
The center position of 1 + R2 + R3 + R4 is almost the position of the molten steel outlet of the molten steel injection nozzle, and # 3 is set so that the molten steel flow in each of the up, down, left, and right directions (R1 to R4) can be adjusted.
The electric coils of the group # 4 and the group # 4 may be connected to one linear motor for generating thrust in the x direction.
Similarly, the # 5 group and # 6 group electric coils are
One linear motor connection that generates a directional thrust may be used. The electric coils of the # 3 and # 4 groups are connected to one linear motor connection, and the # 5 and # 6 groups are connected.
If the electric coil of the pump is connected to one linear motor, a combined thrust that can adjust the rotation angle about the axis extending in the y direction through the position (x, z coordinates) of the molten steel outlet is obtained,
This is suitable, for example, for adjusting the direction of the molten steel flow (protruding flow) entering the mold from the molten steel injection nozzle on the x, z plane. In this case, the other linear motor opposed to the mold is sandwiched. As the polarity, it is preferable to increase the magnetic flux penetration depth into the molten steel.

[0040]

According to the present invention, the linear motor (3F /
3L), since the thrust in the x direction and the thrust in the z direction can be applied simultaneously, by changing the magnitude and direction of both thrusts, it is possible to adjust the magnitude and direction of the combined thrust, which is the resultant of them. Therefore, the movement of the molten steel MM can be controlled two-dimensionally with a relatively high degree of freedom of adjustment without changing the position of the mechanical element, and the complicated movement of the molten steel MM can be rectified.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of an embodiment of the present invention.

FIG. 2 is a perspective view showing an appearance of a linear motor 3L shown in FIG.

FIG. 3 shows the electromagnet cores 4F and 4L shown in FIG.
It is sectional drawing fractured | ruptured horizontally in 3 lines.

FIG. 4 shows the electromagnet cores 4F and 4L shown in FIG.
It is sectional drawing fractured | ruptured perpendicularly in three lines.

FIG. 5 shows electric coil groups # 1 and # shown in FIG.
FIG. 2 is a block diagram showing a system configuration for energizing 2, # 3, and # 4. .

FIG. 6 shows electric coil groups # 5 and # shown in FIG.
6 is a block diagram illustrating a system configuration for energizing # 6, # 7, and # 8. FIG.

FIG. 7 is a sectional view corresponding to FIG. 3, showing connection and phase division of the electric coil shown in FIG. 3;

FIG. 8 is a sectional view corresponding to FIG. 4 and showing the connection and phase division of the electric coil shown in FIG. 4;

9 is an electric coil C of the linear motor 3F shown in FIG.
Power supply circuit VC1 for applying a three-phase AC voltage to F4 to CF6
FIG. 3 is an electric circuit diagram showing the configuration of FIG.

10A shows the phase division of the electric coil and the flowing direction of the molten steel MM when the switches SW2 and SW3 shown in FIG. 5 are turned off, and FIG. 10B shows the switch SW1 shown in FIG. FIG. 4 is a sectional view corresponding to FIG. 3 showing the phase division of the electric coil when SW4 is turned off and the direction of the driving force applied by the linear motor to the molten steel MM.

11A shows the phase division of the electric coil and the flow direction of the molten steel MM when the switches SW6 and SW7 shown in FIG. 6 are turned off, and FIG. 11B shows the switch SW5 shown in FIG. FIG. 5 is a cross-sectional view corresponding to FIG. 4 showing the phase division of the electric coil and the direction of the driving force applied by the linear motor to the molten steel MM when the switch SW8 is turned off.

12A is a front view showing the magnetic pole end side of the linear motor shown in FIG. 2, and FIG. 12B is a view showing regions R1 to R shown in FIG.
It is a front view which shows the direction of the synthetic thrust in 4.

FIG. 13 is a front view showing the direction of the combined thrust in the regions R1 to R4 shown in FIG.

FIG. 14 is a front view showing the direction of the combined thrust in the regions R1 to R4 shown in FIG.

[Explanation of symbols]

1: inner wall of mold 3F, 3L: linear motor MM: molten steel 4F, 4L: electromagnet core 5F, 5L: long side 6R, 6L: short side CF1 to CF12, CL1 to CL12: electric coil U1, V1, W1: electric Power supply connection terminals of coils CF4 to CF6 U2, V2, W2: Power supply connection terminals of electric coils CF1 to CF3 U3, V3, W3: Power supply connection terminals of electric coils CL1 to CL3 U4, V4, W4: Power supply connection terminals of electric coils CL4 to CL6 Power connection terminals U5, V5, W5: Power connection terminals of electric coils CF7 to CF9 U6, V6, W6: Power connection terminals of electric coils CF10 to CF12 U7, V7, W7: Power connection terminals of electric coils CL10 to CL12 U8, V8, W8: Power supply connection terminals of electric coils CL7 to CL9 SW1 to SW8: Switching relay switch VC1 to VC8: Power supply circuit 21: Pouring nozzle

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-71403 (JP, A) JP-A-4-157053 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B22D 11/115 B22D 11/04 311 B22D 27/02

Claims (3)

(57) [Claims] 1. The method of claim 1 wherein the mold surrounding the molten metal is horizontal x, vertical
2D x and z, along one of the mold sides to have spread in the z direction, x, a plurality each of z-direction distribution, x,
a plurality of magnetic poles facing the mold side in the y direction perpendicular to the z-direction; a plurality of electrical coils for exciting the magnetic poles; to the electrical coil, the magnetic poles in the mold the molten metal moving magnetic fields in the x-direction x drive energizing means for energizing to give; and, to the electrical coil, z drive energizing means the magnetic pole passing a moving magnetic field in the z-direction to provide a mold in the molten metal; wherein the magnetic poles, x Extending in the z direction and distributed in the z direction.
Lot and a plurality of slots extending in the z direction and distributed in the x direction.
At the land between the above slots of the magnetic core having
Yes; electric coil inserted in slots distributed in x direction
Pairs distributed in the x direction and slots distributed in the z direction
A set distributed in the z-direction inserted in the x-axis;
The stage energizes a set of electric coils distributed in the x direction, and is driven z
The energizing means energizes a set of electric coils distributed in the z direction.
That; flow control apparatus for molten metal, characterized in that. 2. The molten metal flow control device according to claim 1 , wherein the x-drive energizing means includes means for adjusting an energizing level. Wherein x drive energizing means, for switching the moving direction of the moving magnetic field in the x-direction, including an electrical coil energization phase order switching device, according to claim 1 or flow control of molten metal according to claim 2 apparatus.