JPS645986B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a horizontal continuous casting apparatus.

In conventional horizontal continuous casting equipment, the tundish nozzle made of refractory material and the water-cooled mold are fixed to each other in order to prevent molten metal from flowing out between the tundish nozzle and the water-cooled mold. It was configured. Therefore, the portion of the tundish nozzle adjacent to the water-cooled mold is cooled, and a solidified shell is formed at the molten metal contact area, which is fixed to the tundish nozzle. Furthermore, since the molten metal enters the pores of the refractory material constituting the tundish nozzle and solidifies as it is, the adhesion force increases. Therefore, when the cast body is pulled out, the solidified shell sometimes ruptures and a so-called breakout occurs.

In the prior art to solve this problem, a non-porous silicon nitride ring or boron nitride ring with excellent lubricity is hermetically connected between the tundish nozzle and the mold. These silicon nitride rings and boron nitride rings have a short lifespan and are expensive.
Moreover, even if these materials are used, although they have the effect of alleviating the sticking of the tundish nozzle and the coagulating shell, it is not possible to completely avoid the sticking of the mold tube and the coagulating shell.
As seen in 15332, intermittent extraction is forced.

In order to solve these drawbacks of the prior art, an electromagnetic field generating means that generates a higher magnetic flux density at the bottom than at the top of the molten metal is placed near the boundary between the tundish nozzle and the mold. A horizontal continuous casting facility has been proposed in which the casting is constricted near the boundary (Japanese Patent Application No. 56-94333). By squeezing the molten metal in this way, the molten metal does not come into contact with the tundish nozzle, preventing the solidified shell from sticking to the tundish nozzle as described above, and preventing continuous drawing. It becomes possible.
Furthermore, since it is not necessary to fix the tundish nozzle and the mold, it is possible to vibrate the mold, which also prevents the coagulation shell from sticking to the tundish nozzle or the mold.

However, since the amount of molten metal stored in the tundish changes, the static pressure acting on the surface layer of the molten metal in the tundish nozzle and the mold also changes. In particular, during unsteady conditions such as at the end of casting or when replacing the ladle, the liquid level of the molten metal in the tundish changes greatly, and the static pressure of the molten metal in the tundish nozzle and mold changes accordingly. In such a case, the position where the molten metal squeezed by the electromagnetic field generating means comes into contact with the inner surface of the mold moves in response to fluctuations in static pressure. As the position of contact of the molten metal with the inner surface of the mold changes, the total length of the cooling zone within the mold changes. Since the solidified thickness changes accordingly, it becomes impossible to obtain a good slab. Furthermore, in the mold, the static pressure is greater at the lower part of the molten metal, so even with the electromagnetic field generating means, the contact pressure of the molten metal against the inner surface of the mold tends to be greater at the lower part. Therefore, the cooling effect of the lower part of the molten metal becomes large and uneven cooling makes it impossible to obtain a good slab. This means that
The same is true in the prior art, as shown in Japanese Utility Model Application No. 52-160615, in which an electromagnetic force is generated to apply a restriction to the molten metal from a tundish nozzle toward the center.

Another prior art is JP-A-53-76130. In this prior art, in order to perform gravity compensation of the molten metal, an electrode is immersed in the molten metal in a tundish nozzle, and a longitudinal current is passed through the molten metal.
It is configured to compensate for the gravity of the slab by generating a magnetic field perpendicular and horizontal to the longitudinal direction of the slab. In such prior art, the electrodes are immersed in the molten metal and a current is supplied to the molten metal, so maintenance thereof is troublesome.

An object of the present invention is to provide a horizontal continuous casting apparatus in which the thickness of the solidified shell produced on the surface layer of molten metal cooled on the inner surface of the mold is uniform along the circumferential direction.

The first invention of the present invention is constructed by surrounding at least the vicinity of the boundary between a tundish nozzle and a mold having an inner diameter larger than the tundish nozzle, and winding the tundish nozzle and a mold at intervals in the radial direction. It is provided so that it can be angularly displaced around a horizontal axis perpendicular to the axis of the
A coil that applies electromagnetic force toward the center of the molten metal so that the diameter of the molten metal is reduced near the boundary between the tundish nozzle and the mold, and a coil that applies an electromagnetic force toward the center of the molten metal so that the diameter of the molten metal is reduced near the boundary between the tundish nozzle and the mold. a detection means for detecting the position; a drive means for angularly displacing the coil around a horizontal axis perpendicular to the axes of the tundish nozzle and the mold; The amount of angular displacement of the coil by the driving means is controlled so that the lower part of the coil approaches the molten metal with the lower part of the coil being downstream in the drawing direction than the upper part of the coil when the lower part of the coil is downstream in the drawing direction than the upper part of the coil. 1 is a horizontal continuous casting apparatus characterized in that it includes a control means;

Further, the second invention of the present invention is constructed by surrounding at least the vicinity of the boundary between the tundish nozzle and a mold having an inner diameter larger than the tundish nozzle, and the tundish nozzle and the mold are wound at intervals in the radial direction. It is installed so that it can be angularly displaced around a horizontal axis perpendicular to the axis with the mold, and is excited by AC power to direct the molten metal toward the center so that the diameter of the molten metal decreases near the boundary between the tundish nozzle and the mold. a coil for applying an electromagnetic force toward the tundish nozzle and a detection means for detecting the thickness of the solidified shell above and below the cast body at the mold exit; a driving means for displacing; and a coil in a position where the lower part of the coil is downstream in the drawing direction than the upper part of the coil when the thickness of the solidified shell is greater at the lower part than the upper part in response to the detection output of the detecting means; The present invention is a horizontal continuous casting apparatus characterized in that it includes a control means for controlling the amount of angular displacement of the coil by the drive means so that the lower part approaches the molten metal.

According to the first invention, the coil can be angularly displaced around a horizontal axis perpendicular to the axes of the tundish nozzle and the mold so as to reduce the diameter of the molten metal at least near the boundary between the tundish nozzle and the mold. It is provided. The detection means detects the upper and lower contact start positions of the reduced diameter molten metal with the inner surface of the mold. Therefore, the contact start position is at the upper part, which is on the downstream side in the pulling direction (45 in the pulling direction) than the lower part.
(ie, to the right in FIGS. 2, 5, and 6), the lower part of the coil is displaced upward. As a result, a larger electromagnetic force acts on the lower part of the molten metal toward the center. Therefore, the contact start position where the molten metal contacts the inner surface of the mold can be adjusted to be approximately the same vertically, or so that the lower part of the molten metal is on the downstream side in the drawing direction than the upper part. Thereby, the thickness of the solidified shell of the cast body at the mold exit can be made approximately equal between the upper and lower parts.

Further, according to the second invention, the thickness of the solidified shell above and below the cast body at the mold exit is detected,
When the thickness of the solidified shell is larger at the bottom than at the top, the lower part of the coil is displaced upward, which causes a larger electromagnetic force to act on the lower part of the molten metal toward the center, which increases the thickness of the solidified shell. The thickness can be made approximately equal between the upper and lower parts of the casting.

That is, the coil is provided so that it can be angularly displaced around a horizontal axis perpendicular to the axes of the tundish nozzle and the mold, so that the position where the reduced diameter molten metal starts contacting the inner surface of the mold is at the upper part, which is downstream in the drawing direction from the lower part. When the lower part of the coil is on the downstream side in the drawing direction than the upper part of the coil (that is, in a state where θ is an obtuse angle like the electromagnetic field generating means 99 in FIG. 2), the lower part of the coil is The coil is driven through an angular displacement so as to approach the molten metal (ie, counterclockwise in FIG. 2 so that the angle θ in FIG. 2 becomes even larger). Further, when the thickness of the solidified shell is greater at the lower part than at the upper part, the lower part of the coil is angularly displaced so as to approach the molten metal with the lower part of the coil being downstream in the drawing direction than the upper part of the coil. In this way, a larger electromagnetic force is applied to the lower part of the molten metal toward the center, and as described above, a high-quality cast body can be obtained.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall system diagram showing the basic configuration of the present invention. In this horizontal continuous casting equipment, the tundish 1 is
A heating device 2 is provided to stabilize the temperature of the molten metal within. Cast body 4 from mold 3
is pulled out from the cooling zone 5 by a drawing device 6 and cut by a cutting device 7 to obtain an ingot 9. This ingot 9 is conveyed by a roller table 10.

FIG. 2 shows the basic structure of the present invention, and is an enlarged sectional view of the vicinity of the mold 3. The tundish 1 is lined with a refractory material 11 and stores molten metal 12. This tundish 1 is provided with a tundish nozzle 14 made of a refractory material. The mold 3 has a coolant passage,
A copper mold tube is cooled and the passage 16 for the casting 4 of this mold 3 communicates coaxially with the tundish nozzle 14 .

The nozzle hole 95 of the tundish 1 is provided with a sliding gate 96 for allowing and blocking the flow of the molten metal 12, and this sliding gate 96 is driven by a driving cylinder 97.
An electromagnetic field generating means 98, which is a coil formed by winding a wire around the tundish nozzle 14, is arranged near the end of the tundish nozzle 14 closer to the mold 3. Due to the electromagnetic force generated by the electromagnetic field generating means 98, the molten metal 12 flowing within the tundish nozzle 14 is constricted inward in the radial direction. The mold 3 has a larger inner diameter than the tundish nozzle 14. Tandate nozzle 1
Mold 3 at boundary 17 between 4 and mold 3
Near the end face facing the tundish nozzle 14, another electromagnetic field generating means 99 is arranged in a plane inclined at an angle θ with respect to the drawing direction 45.
The electromagnetic field generating means 98 and 99 may be integrated, or only one of the means 99 may be angularly displaceable as described later, and an induced current absorbing plate 98' is provided inside them. , 99' are provided.

FIG. 3 is a diagram showing the static pressure distribution acting on the surface layer of the molten metal 12 near the boundary 17. Static pressure acts on the surface layer of the molten metal 12, which increases toward the bottom. Therefore, as shown in FIG. 4, if an electromagnetic field generating means 98 having a shape approximately symmetrical to the curve 101 showing the static pressure distribution in FIG. The result is as shown by curve 103 in FIG. That is, an inwardly concave electromagnetic force distribution is obtained on both sides of the molten metal 12. Such curve 10
If the static pressure shown in FIG. 3 is compensated for by the electromagnetic force given by 3, the diameter-reduced portion 22 will have a laterally expanded diameter. Therefore, if the electromagnetic field generating means 98 is shaped to be slightly recessed inward from both sides of the curve, the electromagnetic force distribution will be a curve 104 shown by a broken line. This curve 104 is similar to the curve 101 showing the static pressure distribution in FIG. 3, and by using the electromagnetic field generating means 98 having such a shape,
It becomes possible to make the distance between the reduced diameter portion 22 and the inner surface of the tundish nozzle 14 substantially uniform along the circumferential direction.

The electromagnetic field generating means 99 has its strands in the mold 3.
It is a coil that is wound around the axis of. When a current flows through the strands of the electromagnetic field generating means 99 perpendicular to the plane of the paper in FIG. An eddy current is generated, indicated by reference numeral 105, and a magnetic field is generated in the direction of arrow 106. Therefore, the molten metal 1 in the mold 3
2, an electromagnetic force shown by an arrow 107 is generated toward the front along the drawing direction 45. In addition, the electromagnetic field generating means 99 is provided so as to be inclined by an angle θ with respect to the axis of the mold 3 so as to move toward the front in the drawing direction 45 as it goes downward. As a result, a larger electromagnetic force is applied to the molten metal 12 in the mold 3 at its lower part than at its upper part. Therefore, the molten metal 12 in the mold 3
maintains a plane substantially perpendicular to the drawing direction 45. Therefore, the solidification conditions at the position where the molten metal 12 contacts the inner surface of the mold 3 are uniform throughout the circumferential direction. In this way, the contact length of the molten metal 12 within the mold 3, that is, the cooling capacity, does not differ between the upper and lower positions, and a uniform cooling effect can be obtained.

In this embodiment as well, a position detection means 109 consisting of, for example, a plurality of thermocouples 108 is provided at any position along the circumferential direction of the mold tube 33 near the end of the mold 3 near the tundish nozzle 14. . This position detection means 1
The electric power supplied to the electromagnetic field generating means 98 and 99 is controlled by a control means (not shown) so that the contact start position 112 of the molten metal 12 detected by the molten metal 09 is at a predetermined constant position. control. Thereby, the molten metal 12 near the boundary 17
Regardless of fluctuations in the static pressure acting on the surface layer of the steel, the contact start position 112 remains approximately constant, making it possible to obtain a good slab. Also, departure start position 11
3 is also kept constant, so nozzle 4 of lubricant 46
2 will not be blocked.

FIG. 5 is a front view of one embodiment of the present invention, FIG. 6 is a sectional view taken from the cutting plane line - in FIG. 5, and FIG. 7 is a sectional view taken from the cutting plane line - in FIG. 6. FIG. In this embodiment, the above-mentioned FIGS.
The inclination angle θ of the electromagnetic field generating means 99 in the configuration shown in FIG. 4 is changed by the hydraulic cylinder 115 as a driving means, and the contact start position of the molten metal 12 is set all around the entire circumference regardless of static pressure fluctuations near the boundary 17. Maintain the same setting position across the board.

The electromagnetic field generating means 99, which is a coil, is oriented such that its lower part is downstream in the drawing direction 45 than its upper part. The contact start position of the molten metal 12 with the inner surface of the mold tube is such that the upper and lower parts are at the same position in the axial direction, as described above, or the upper part is located at a lower position than the lower part in the drawing direction 45 as shown in FIG. 10, which will be described later. It must be on the upstream side.
For this purpose, the lower part of the electromagnetic field generating means 99 is angularly displaced so that it approaches the molten metal, that is, the angle θ becomes larger, when the contact start position is at the upper part and is downstream of the lower part in the drawing direction 45. Ru.
As a result, the contact start position at the bottom of the molten metal can be moved downstream in the drawing direction 45, while the contact position at the top of the molten metal can be moved upstream in the drawing direction.

The electromagnetic field generating means 99 is housed in a storage box 116 made of a non-magnetic material filled with inert gas,
This storage box 116 is fixedly provided within a cooling box 117 made of a non-magnetic material through which cooling water flows. A pair of trunnion shafts 118 and 119 are fixed to the outer periphery of the cooling box 117, which extend horizontally at right angles to the axis of the tundish nozzle 14. These trunnion shafts 118 and 119 are connected to the mold 3
A trunnion bearing 120,1 fixedly supported on
Received by 21.

Each trunnion shaft 118, 119 is a hollow cylinder, and a cylinder 122 connected to the storage box 116 passes through one trunnion shaft 118 and projects outward. The outer end of this cylindrical body 122 is closed, and a tube 123 through which a cable for connecting to the electromagnetic field generating means 99 is inserted extends concentrically through the outer end of the cylindrical body 122. . A power supply cable 125 is connected to the end of the tube body 123 via a rotary joint 124.
is connected. Further, at the outer end of the cylinder 122,
Enclosed gas supply hose 12 via rotary joint 126
7 is connected. In addition, the supply pressure of the filled gas is
The pressure is set higher than the pressure of the cooling water in the cooling box 117, so that even if the seal on the storage box 116 is incomplete, the cooling water will flow into the storage box 116 and accidents such as electrical leakage will occur. This occurrence will be prevented as much as possible.

Inside the cooling box 117 is the other trunnion shaft 11.
9 on the axis line by a partition plate 128.
A water supply pipe 129 and a drain pipe 130 are inserted into the trunnion shaft 119, and one end of each of the water supply pipe 129 and the drain pipe 130 is connected to the cooling box 117 on both sides of the partition plate 128, respectively. The other ends of the water supply pipe 129 and the drain pipe 130 concentrically penetrate the trunnion shaft 119 and project outward. A water supply hose 132 is connected to the other end of the water supply pipe 129 via a rotary joint 131, and a water supply hose 132 is connected to the other end of the water supply pipe 129.
A drainage hose 134 is connected to the other end of the drain hose 134 via a rotary joint 133. Therefore, the cooling water goes around the inside of the cooling box 117 almost once and is discharged.

The hydraulic cylinder 115 is connected to the other trunnion shaft 11
It is fixed to the mold 3 near 9 with an axis parallel to the mold 3. The other trunnion shaft 119
A drive lever 13 extending radially outward is located in the middle of the
5 is fixed, and the tip of a piston rod 136 of the driving means 115 is pin-coupled to the outer end of this driving lever 135. Therefore, by driving the hydraulic cylinder 115 to expand and contract, the trunnion shafts 118 and 119 rotate about their axes, and the electromagnetic field generating means 99 swings as shown by arrow 137. In this way, the angle θ that the electromagnetic field generating means 99 forms with the axis of the mold 3 can be arbitrarily adjusted.

Near the end of the mold tube 33 closer to the tundish nozzle 14, position detection means 138, 139 are provided for detecting the contact start position of the molten metal.
are provided at the upper and lower parts, respectively. These position detection means 138, 139 are provided to a control means 32 shown in FIG. 8, which will be described later.
2 controls the hydraulic cylinder 115 so that the contact start positions of the upper and lower parts of the molten metal 12 are at the same preset position along the axis of the mold 3.

FIG. 8 is a block diagram showing the configuration of the control means 32. The signals from the position detection means 138 and 139 are sent to the comparator 88 via the arithmetic unit 87 of the control means 32.
given to. A signal from the setting device 89 is input to the comparator 88, and the comparator 88 is connected to the arithmetic unit 87.
And a signal corresponding to the difference between both signal voltages from the setting device 89 is given to the control section 90. The control unit 90 controls the hydraulic pressure supply means 68 in response to the signal from the comparator 88, thereby causing the hydraulic cylinder 115 to work strongly. The control means 32 causes the hydraulic cylinder 115 to operate so that the contact start position of the molten metal 12 with the inner surface of the mold tube 33 is at the same position along the axial direction at the upper and lower parts, and at a preset position. As described above, when the contact start position of the molten metal 12 to the inner surface of the mold tube 33 is maintained at the same position set at the upper and lower parts, both sides of the molten metal 12 are also necessarily at the same position. Therefore, the molten metal 12 starts to come into contact with the inner surface of the mold tube 33 at the same set position along the axial direction over the entire circumference of the inner surface of the mold tube 33. As a result, the length of the cooling zone in the mold tube 33 becomes uniform over the entire circumference of the molten metal, and the solidified thickness becomes uniform over the entire circumference, making it possible to obtain a good slab.

According to this embodiment, the inclination angle θ of the electromagnetic field generating means 99 can be easily adjusted in response to fluctuations in static pressure. Furthermore, since it has a trunnion support structure, power supply and water supply and drainage can be carried out extremely easily. Moreover, since the heat generated by the electromagnetic field generating means 99 and the heat given to the electromagnetic field generating means 99 from the molten metal 12 are absorbed by the cooling water, the electromagnetic field generating means 99 does not overheat. Furthermore, since the electromagnetic field generating means 99 is supported on the mold 3 side, it is convenient for receiving the reaction force from the molten metal 12. In addition, when the mold 3 is configured to vibrate, it is necessary to support the electromagnetic field generating means 99 with a frame of the mold vibrating device.

FIG. 9 is a front view of another embodiment of the invention.
This embodiment is similar to the embodiments shown in FIGS. 5 to 7 described above, but it should be noted that the electromagnetic field generating means 99 is movable along the axis of the mold 3 as well. That is, trunnion bearings 120, 121
is supported on a support truck 160, and the hydraulic cylinder 151 is similarly supported on the support truck 160. Tandate nozzle 14 and mold 3
A rail 161 extending parallel to the tundish nozzle 14 is laid below the tundish nozzle 14, and the support cart 160 is movable on the rail 161.
At a fixed position below the support truck 160 is a hydraulic cylinder 16 having an axis parallel to the rail 161.
2 is supported, and the piston rod 163 of the hydraulic cylinder 162 is pin-coupled to the support truck 160. Therefore, by driving the hydraulic cylinder 162 to expand and contract, the support cart 160 moves on the rail 161 between the stoppers 164 and 165 at both ends, and therefore the electromagnetic field generating means 99 moves along the axis of the tundish nozzle 14. be moved.

In this embodiment, since the electromagnetic field generating means 99 can be moved along the drawing direction 45, the contact start position of the molten metal 12 can be changed and the cooling conditions can be changed.

As a further embodiment of the present invention, as shown in FIG. 10 in a simplified manner, the contact start position 166 at the lower part of the mold tube 33 is controlled to a position further forward in the drawing direction 45 than the contact start position 167 at the upper part. You may also do so. In this way, the contact length of the molten metal 12 with the mold tube 33 is different in the upper and lower parts, and the contact length in the lower part is smaller, but the contact pressure with the mold tube 33 in the lower part of the molten metal 12 is greater. . Therefore, even if the contact length is relatively short, the cooling conditions are equal to the upper part, and therefore the solidification thickness can be made uniform over the entire circumference of the molten metal 12.

Hydraulic cylinder 115 as another embodiment of the invention
may be a pneumatic cylinder or a motor. Further, in each of the above-described embodiments, the tundish nozzle 14 and the mold 3 have a rectangular cross-section perpendicular to the axis, but the tundish nozzle 14 and the mold 3 may have a circular cross-section perpendicular to the axis.

As another embodiment of the present invention, a solidification thickness gauge may be provided at the exit of the mold 3 to measure the thickness of the solidified shell in the upper and lower surface layer portions of the molten metal 12. These coagulation thickness gauges are indicated by reference numerals 91 and 92 in FIG. 8, and the detected values by them are as follows:
As shown in FIG. 8, the computing unit 93 of the control means 32
is applied to comparator 88 via. In this way, the thickness of the solidified shell at the exit of the mold 3 is fed back to the control of the drive means 31, allowing more precise control. Note that the solidification thickness gauges 91 and 92 may be replaced with radiation surface thermometers. When the thickness of the solidified shell is larger at the bottom than at the top, the angle θ is displaced to become larger. Therefore, a large electromagnetic force in the center direction acts on the lower part of the molten metal 12, and the contact start position can be moved downstream in the drawing direction, or the contact pressure of the lower part of the molten metal 12 with the inner surface of the mold tube 33 can be reduced. Can be made smaller.
In this way, the thickness of the solidified shell can be made equal in the upper and lower parts at the exit of the mold 3.

As described above, according to the first invention, the coil is displaced up and down so that the contact start position of the molten metal with the mold is a preset position, so that gravity compensation of the molten metal can be reliably performed. As a result, cooling can always be achieved under stable cooling conditions regardless of fluctuations in the static pressure acting on the surface layer of the molten metal, and a good slab can be obtained. Further, since the position where the molten metal leaves the tundish nozzle is also held at a set position, the lubricant can be stably supplied.

Furthermore, according to the second invention, the thickness of the upper and lower solidified shells of the cast body at the mold exit can be made almost equal, thereby making the solidified thickness uniform over the entire circumference of the molten metal. I can do it.
In this way, cooling can always be achieved under stable cooling conditions, and good slabs can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an overall system diagram showing the basic structure of the present invention, FIG. 2 is an enlarged sectional view of the vicinity of the mold 3 showing the basic structure of the present invention, and FIG. 3 is the vicinity of the boundary 17 in FIG. FIG. 4 is a diagram showing the electromagnetic force distribution, and FIG. 5 is a front view of another embodiment of the present invention.
6 is a sectional view taken from the cutting plane line - of FIG. 5, FIG. 7 is a sectional view taken from the cutting plane line - of FIG. 6, and FIG. 8 is a block diagram showing the configuration of the control means 32. 9 and 10 are simplified cross-sectional views of other embodiments of the present invention. 3...mold, 12...molten metal, 14...
tandate nozzle, 17...boundary, 98,9
9... Electromagnetic field generating means, 112, 166, 167
...Contact start position, 24...Coagulation shell, 10
9,138,139... position detection means, 32...
Control means, 31... Drive means, 45... Pulling direction, 115... Hydraulic cylinder, 160... Support trolley.

Claims (1)

[Scope of Claims] 1 The tundish nozzle is wound around at least the vicinity of the boundary between the tundish nozzle and a mold having a larger inner diameter, and is wound at intervals in the radial direction. The tundish nozzle is installed so that it can be angularly displaced around a horizontal axis perpendicular to the axis with the mold, and is excited by AC power to direct the molten metal toward the center so that the diameter of the molten metal decreases near the boundary between the tundish nozzle and the mold. a coil for applying an electromagnetic force toward the mold; a detection means for detecting the upper and lower contact start positions of the reduced diameter molten metal on the inner surface of the mold; a driving means that angularly displaces around the axis; and in response to the detection output of the detecting means, when the contact start position is at the upper part and is downstream in the pulling direction than the lower part, the lower part of the coil is located downstream in the pulling direction than the upper part of the coil. 1. A horizontal continuous casting apparatus, comprising: control means for controlling the amount of angular displacement of the coil by the drive means so that the lower part of the coil approaches the molten metal in a straight posture. 2 It is constructed by surrounding at least the vicinity of the boundary between the tundish nozzle and a mold having an inner diameter larger than that, and is wound at intervals in the radial direction, and is perpendicular to the axis of the tundish nozzle and the mold. It is installed so that it can be angularly displaced around a horizontal axis, and is excited by AC power to apply electromagnetic force toward the center of the molten metal so that the diameter of the molten metal decreases near the boundary between the tundish nozzle and the mold. a coil to act on; a detection means for detecting the thickness of the solidified shell above and below the cast body at the mold exit; and a drive means for angularly displacing the coil about a horizontal axis perpendicular to the axes of the tundish nozzle and the mold; In response to the detection output of the detection means, when the thickness of the solidified shell is greater at the lower part than at the upper part, the lower part of the coil approaches the molten metal in a posture such that the lower part of the coil is on the downstream side in the drawing direction than the upper part of the coil. 1. A horizontal continuous casting apparatus comprising: control means for controlling the amount of angular displacement of the coil by the drive means.