JP2007283380A - Mold and method for continuous casting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold for continuous casting with which in the mold for continuous casting having electromagnetic coil going around the mold, the interval between mutual second cooling copper plates can easily be changed and the electromagnetic coil can compactly be fitted. <P>SOLUTION: The mold for continuous casting is provided with a first cooling copper plate 20 and a first back-plate 25 at the short wall side, and a second cooling copper plate 30 and a second back-plate 35 at the long wall side, and the electromagnetic coil 1 set so as to go around a space 15 making flow of molten metal. The electromagnetic coil 1 is fixed to one side of the second back-plate 35a and also, the interval between the electromagnetic coil 1 and the other side of the second back-plate 35b is set so as to be slidable in the long wall side vertical direction 60 and also, is restricted at the interval between a pushing tool 3 and a sliding surface 2 in the casting direction, and when the second cooling copper plate 30 and the first cooling copper plate 20 are closely stuck between their side faces, the electromagnetic coil 1 is restricted with a stopper 7 so as not to move to the outer part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a continuous casting mold having an electromagnetic coil that goes around a mold and a continuous casting method using the continuous casting mold.

  In the continuous casting technology of molten metal, a technology that uses electromagnetic force during casting has been developed to stabilize the molten metal surface, smooth the surface of continuously cast slabs, and increase the casting speed. ing.

  In Patent Document 1, an electromagnetic coil is arranged around a mold so as to circulate in a space where molten metal flows, and an alternating current is continuously supplied to the electromagnetic coil, and an electromagnetic force generated by an alternating magnetic field is used to perform melting. A method of improving the surface properties of a slab by applying a pinch force to a metal and raising a region where the in-mold meniscus contacts the mold in a convex shape is disclosed. This facilitates powder inflow.

  Further, by reducing the contact pressure between the mold and the slab in the initial solidification, the surface properties of the manufactured mold can be improved. However, this method has a problem that an induced current is induced in the cooling copper plate constituting the mold by the alternating magnetic field generated by the electromagnetic coil, and the magnetic field applied to the molten metal in the mold is attenuated.

  In order to suppress the attenuation of the magnetic field applied to the molten metal and improve the electromagnetic effect, Patent Document 2 uses a mold in which slits are formed. The slit can efficiently apply a pinch force to the molten metal.

  Further, in Patent Document 3, a cooling copper plate of a mold and a back plate and an insulator made of nonmagnetic stainless steel for fixing the same from the back are formed, and the cooling copper plate and the back plate are electrically insulated via an insulator. ing. By insulating the members, loss of electromagnetic force can be reduced. Further, by dividing the entire length of each side of the mold as a unit, there is an advantage that processing accuracy and assembly accuracy can be ensured.

  Further, Patent Document 4 discloses a continuous casting mold in which an insulator is disposed in a cooled copper plate. Furthermore, a means for preventing a gap from being generated in the mold due to the heat of the molten metal is arranged. By these members, the deterioration of the insulation due to the change in the width of the cast slab is prevented, and the insulation of the mold is maintained for a long time. For this reason, it becomes possible to manufacture a high quality slab over a long period of time.

  In Patent Document 5, a solenoid-like electromagnetic coil is arranged independently around the mold so as to circulate around the molten steel meniscus portion from the upper part of the mold, and the position where the electromagnetic coil does not interfere with the mold when the mold is removed and the mold A continuous casting apparatus is described which is movable between the mounting position and the mounting position.

  In continuous slab casting, it is necessary to continuously cast slabs having various slab widths. In order to change the casting width during casting, a pair of second cooling copper plates (hereinafter also referred to as “long-side copper plates”) and a pair of first cooling copper plates (hereinafter also referred to as “short-side copper plates”) side surfaces. The width is changed by moving the short side copper plate during casting.

  When casting the molten metal, the long side copper plate is brought into close contact with the side surface of the short side copper plate to perform casting. On the other hand, when inserting the dummy bar, it is necessary to facilitate the insertion of the dummy bar by making the distance between the long side copper plates wider than at the time of casting. Moreover, when cleaning the contact surface of a long side copper plate and a short side copper plate, it is necessary to provide a gap | interval between both. Therefore, a mechanism for changing the distance between the long side copper plates is provided, and when the molten metal is continuously cast, the long side copper plate and the side surface of the short side copper plate are brought into close contact with each other. At the time of cleaning between the second cooling copper plate and the second cooling copper plate, a gap is made between the second cooling copper plate and the first cooling copper plate side surface during casting preparation.

JP 52-32824 A Japanese Patent Laid-Open No. 5-15949 JP 2000-246397 A JP 2005-297006 A JP 2005-305535 A

  Using an electromagnetic coil arranged to circulate in the space where the molten metal in the mold circulates and applying an alternating current to this electromagnetic coil, a pinch force is generated in the molten metal in the mold, while the electromagnetic coil itself is placed outside. Electromagnetic force that tries to spread it also acts. Therefore, it is necessary to sufficiently fix the electromagnetic coil so that it does not spread outward.

  The back surface of the second cooling copper plate (long side copper plate) is fixed by the second back plate. A pair of second back plates is provided for a pair of second cooling copper plates. If the electromagnetic coil is fixed to the pair of second back plates, the electromagnetic coil is sufficiently fixed and restrained so that the electromagnetic coil does not spread outward even when an alternating current is applied to the electromagnetic coil. Can do.

  However, as described above, it is necessary to widen the interval between the second cooling copper plates when the dummy bar is inserted, during cleaning between the first cooling copper plate and the second cooling copper plate, and during preparation for casting. Is fixed to both of the pair of second back plates, it becomes inconvenient because the distance between the second cooling copper plates cannot be increased.

  If the bolts that fix the electromagnetic coil and the second back plate are removed each time the dummy bar is inserted, the mold is cleaned, or the casting is being prepared, the work required is complicated and it is necessary to take production downtime. This is not preferable because it is a factor that hinders the productivity of the continuous casting apparatus.

  As described in Patent Document 5, the continuous casting in which the electromagnetic coil is installed independently of the mold and is movable between the position where the electromagnetic coil does not interfere with the mold and the position where the electromagnetic coil is mounted when the mold is removed. The apparatus is difficult to apply because the apparatus becomes large and a place for installing such a large apparatus around the mold cannot be secured.

  The present invention provides a continuous casting mold having an electromagnetic coil that circulates around the mold, wherein the interval between the second cooling copper plates can be easily changed, and the electromagnetic coil can be compactly attached. The purpose is to do.

That is, the gist of the present invention is as follows.
(1) A pair of first cooling copper plates 20 and a pair of first cooling copper plates 20 and a pair of first cooling copper plates 20 and a space 15 through which molten metal flows are partitioned so that the pair of first cooling copper plates 20 is sandwiched from the side. A pair of opposed second cooling copper plates 30 disposed and a pair of first back plates 25 fixed to the outside of the first cooling copper plate 20 so as to be electrically insulated from the first cooling copper plate 20. And a pair of second back plates 35 fixed to the outside of the second cooling copper plate 30 and the electromagnetic coil 1 arranged so as to go around the space 15 through which the molten metal flows. The distance between the cooling copper plates can be varied, and the electromagnetic coil 1 is fixed to one second back plate, and the casting side surface of the second cooling copper plate 30 is between the electromagnetic coil and the other second back plate. Perpendicular direction (hereinafter referred to as “long side vertical direction 60”) The electromagnetic coil 1 moves outward when the two second cooling copper plates 30 and the side surfaces of the first cooling copper plate 20 are in close contact with each other. A continuous casting mold characterized by being constrained so as not to exist.
(2) The second back plate 35 has a sliding surface 2 that slides the electromagnetic coil 1 in the long-side vertical direction, and the electromagnetic coil 1 is pressed against the sliding surface 2 (1 The mold for continuous casting as described in).
(3) The continuous casting mold according to (2) above, wherein the electromagnetic coil 1 is pressed against the sliding surface 2 by hydraulic pressure or spring force.
(4) The pressing tool 3 that presses the electromagnetic coil 1 against the sliding surface 2 has a contact surface with the electromagnetic coil 1 that is a curved surface or a roller, as described in (2) or (3) above Continuous casting mold.
(5) The continuous casting mold according to any one of (2) to (4), wherein a roller is disposed at a contact portion between the electromagnetic coil 1 and the sliding surface 2.
(6) The second back plate 35 includes a stopper 7 that restrains the electromagnetic coil 1. When the two second cooling copper plates 30 and the side surfaces of the first cooling copper plate 20 are in close contact with each other, the stopper 7 The continuous casting mold according to any one of (1) to (5), wherein the casting is in contact with the outer peripheral side of the electromagnetic coil 1.
(7) When continuously casting molten metal using the continuous casting mold according to any one of (1) to (6) above, the side surfaces of the two second cooling copper plates 30 and the first cooling copper plate 20 Between the two cooling copper plates 30 and the side surfaces of the first cooling copper plate 20 during the preparation for casting and during the cleaning between the first cooling copper plate and the second cooling copper plate. A continuous casting method characterized in that a gap is formed between them.

  In the electromagnetic stirring mold of the present invention, the electromagnetic coil is appropriately held by the second back plate during continuous casting, and the electromagnetic coil is not deformed by the electromagnetic force applied to the electromagnetic coil. The coil is held on the second back plate, and when necessary, the interval between the second cooling copper plates can be easily changed.

  The continuous casting mold of the present invention will be described with reference to FIGS. 1A is a plan view, FIG. 1B is a cross-sectional view taken along line AA, FIG. 1C is a partially enlarged view of FIG. 1B, and FIG. 5 is a partial perspective view.

  As shown in FIGS. 1A and 5, the continuous casting mold of the present invention has a pair of opposing first cooling copper plates 20 and a pair of opposing second cooling plates sandwiching the first cooling copper plate 20. A mold wall surface is formed by the pair of first cooling copper plates 20 and the pair of second cooling copper plates 30. The inside of the mold wall surface becomes a space 15 through which the molten metal flows.

  The first cooling copper plate 20 constitutes the short side of the mold and is movable during continuous casting. Moreover, the 2nd cooling copper plate 30 comprises the long side of a casting_mold | template, and has a mechanism (2nd cooling copper plate moving mechanism 36) which changes the space | interval between the 2nd 2nd cooling copper plates. During the continuous casting, the second cooling copper plate is brought into close contact with the first cooling copper plate. When inserting the dummy bar, cleaning between the first cooling copper plate and the second cooling copper plate, and preparing for casting, the second cooling copper plate and the side surface of the second cooling copper plate have a gap between them. 2 The position of the cooling copper plate 30 can be moved.

  On the outside of the first cooling copper plate 20 and the second cooling copper plate 30, that is, on the side opposite to the side in contact with the molten metal with respect to the first cooling copper plate 20 and the second cooling copper plate 30, a pair of first supporting copper plates 20 is supported. One back plate 25 and a pair of second back plates 35 that support the second cooling copper plate 30 are provided. As shown in FIG. 2B, the first cooling copper plate 20 and the first back plate 25 on the short side are insulated via an insulator 40. The fastening portion between the first cooling copper plate 20 and the first back plate 25 is also insulated by the insulating sleeve and the insulating washer. The first back plate 25 is electrically insulated from the second cooling copper plate 30 and the second back plate 35 in a non-contact manner or through an insulator.

  A cylinder 50 for changing the width of the slab is attached to the outside of the first back plate 25. The cylinder 50 is desirably a system in which the width can be freely changed online during casting, and a structure having a hydraulic control mechanism is preferable. Further, in order to freely change the inclination of the short side composed of the first cooling copper plate 20 and the first back plate 25, as shown in FIG. 2A, two cylinders are attached in the casting direction. Is preferred.

  The second back plate 35a on one side (fixed side) of the pair of second back plates 35 is fixed to the continuous casting apparatus. A second cooling copper plate moving mechanism 36 is attached to the outside of the second back plate 35b on the other side (moving side), and the interval between the second cooling copper plates can be changed.

  The electromagnetic coil 1 of the present invention is arranged so as to go around the space 15 through which the molten metal flows. When an electric current is applied to the electromagnetic coil 1, the electric current flows so as to go around the space where the molten metal flows. By this electric current, an electromagnetic force acts on the solidified shell and molten metal in the mold in a direction away from the mold wall, so that a portion of the in-mold meniscus near the mold wall rises in a convex shape.

  The electromagnetic coil 1 is fixed to one second back plate. Usually, it is preferable to fix to the second back plate 35a on the fixed side. In the example illustrated in FIG. 1, the electromagnetic coil 1 is fixed to the second back plate 35 a on the fixed side by the fixing tool 11.

  The relationship between the other second back plate and the electromagnetic coil will be described. Here, a case where the fixed second back plate 35a and the electromagnetic coil are fixed is taken as an example. Therefore, the other back plate is the second back plate 35b on the moving side.

  Between the electromagnetic coil 1 and the second back plate 35b on the moving side, the second cooling copper plate 30 is slidably installed in a direction perpendicular to the casting side surface (long side vertical direction 60). It is restrained. Since it is restrained in the casting direction 61, the electromagnetic coil 1 can move following the oscillation motion of the second back plate 35 even when performing mold oscillation. Moreover, since it is installed to be slidable in the long side vertical direction 60, even when the second back plate 35b on the moving side is moved to change the interval between the second cooling copper plates, the electromagnetic coil 1 is deformed. No external force is applied.

  When the electromagnetic coil 1 and the second back plate 35b on the moving side are in close contact with the side surfaces of the two second cooling copper plates 30 and the first cooling copper plate 20, the electromagnetic coil 1 is outward. It is restrained not to move. Since the two second cooling copper plates 30 are in close contact with the side surfaces of the first cooling copper plate during continuous casting, a force is applied to spread the electromagnetic coil 1 outward by energizing the electromagnetic coil 1 during continuous casting. In this case, the electromagnetic coil 1 is restrained so as not to move outward, and deformation of the electromagnetic coil 1 can be prevented.

  In a preferred embodiment, as shown in FIGS. 1B and 1C, the second back plate 35b on the moving side has a sliding surface 2 that slides the electromagnetic coil 1 in the long side vertical direction 60, and the electromagnetic The coil 1 is pressed against the sliding surface 2. As a result, the electromagnetic coil 1 and the second back plate 35b on the moving side can slide in the long side vertical direction 60, and at the same time are restrained in the casting direction 61.

In the above embodiment, the electromagnetic coil 1 can be pressed against the sliding surface 2 by hydraulic pressure or spring force. FIGS. 1B and 1C show examples using springs. The force for pressing the electromagnetic coil 1 against the sliding surface 2 may be pressed with such a force that the electromagnetic coil 1 does not move away from the sliding surface 2 during mold oscillation. The acceleration α applied to the electromagnetic coil at the time of mold oscillation is as follows: the oscillation angular frequency is ω, the oscillation amplitude is A, the gravitational acceleration is g, the time is t, and the mass of the electromagnetic coil applied to the second back plate on the moving side is m. ,
α = Aω ² sin (ωt) −g
It can be expressed as. Therefore, the total of the pressing force F pressing the electromagnetic coil against the sliding surface is
F ≧ m (Aω ² −g)
By doing so, it is possible to prevent the electromagnetic coil from separating from the sliding surface during mold oscillation. If the number of pressing tools 3 that press the electromagnetic coil against the sliding surface is n, the pressing force f in each pressing tool is f = F / n.
What is necessary is just to set the hydraulic pressure in the pressing tool 3, or the force of a spring so that it may become.

  In the present invention, the pressing tool 3 that presses the electromagnetic coil 1 against the sliding surface 2 is preferably such that the contact portion with the electromagnetic coil 1 is a curved surface or a roller. A frictional force is generated at a portion where the pressing tool 3 contacts the electromagnetic coil 1. If the frictional force is too large, it becomes a resistance when the electromagnetic coil 1 and the second back plate slide against each other, and a force for deforming the electromagnetic coil acts, which is not preferable.

  In the contact portion between the pressing tool 3 and the electromagnetic coil 1 (the contact portion with the upper sliding surface 9 in the case of FIG. 1 (c) and FIG. 3 (a)), the contact portion shape is flat in FIG. 3 (a). . On the other hand, if the shape of the pressing tool 3 is a curved surface as shown in FIG. 1C, the frictional force can be reduced. It is preferable to dispose the roller 5 on the pressing tool 3 as shown in FIG. 3B at the contact portion with the electromagnetic coil 1 because the frictional force can be further reduced.

  In the present invention, it is also preferable that a roller 6 is disposed at a contact portion between the electromagnetic coil 1 and the sliding surface 2. This is because a frictional force is also generated at the contact portion between the electromagnetic coil 1 and the sliding surface 2, but the frictional force can be reduced by disposing the roller 6 at this portion. Even if the roller 6 is installed on the electromagnetic coil 1 side as shown in FIG. 3C and rolls on the sliding surface, it is installed on the sliding surface 2 side as shown in FIG. It is good also as an electromagnetic coil moves on it.

  In addition, the sliding surface 2 of this invention does not need to form a plane. Two rails facing the long side vertical direction 60 may be arranged, and the electromagnetic coil 1 may slide on the rail, or a roller installed on the electromagnetic coil may roll on the rail.

  In the present invention, as shown in FIG. 4, the second back plate 35 has a stopper 7 that restrains the electromagnetic coil 1. When the stopper 7 is in contact with the outer peripheral side of the electromagnetic coil 1 when the two second cooling copper plates 30 and the side surfaces of the first cooling copper plate 20 are in close contact as shown in FIG. preferable.

  During continuous casting, as shown in FIG. 4A, the two second cooling copper plates 30 and the side surfaces of the first cooling copper plate 20 are in close contact with each other. The electromagnetic coil 1 is restrained by the stopper 7 and is prevented from being deformed outward. Therefore, even when a current is applied to the electromagnetic coil 1 during continuous casting to generate a force that causes the electromagnetic coil 1 to spread outward, deformation of the electromagnetic coil 1 can be prevented.

  On the other hand, when the dummy bar is inserted, during cleaning between the first cooling copper plate and the second cooling copper plate, and during preparation for casting, as shown in FIG. The second back plate 35b on the moving side is moved so as to leave a gap 16a between the cooling copper plate 20 and the side surface. At this time, the stopper 7 moves in a direction away from the electromagnetic coil 1 and moves in a direction in which the gap 16b is vacant, so that the electromagnetic coil 1 is not affected at all.

  Although the main component of the 1st cooling copper plate 20 and the 2nd cooling copper plate 30 is copper, it is preferable that it is a copper alloy containing elements, such as Cr, Zr, and Al. A copper alloy containing elements such as Cr, Zr, and Al is suitable as the first cooling copper plate 20 and the second cooling copper plate 30 because it has excellent permeability of electromagnetic force and low electrical conductivity. The 1st cooling copper plate 20 and the 2nd cooling copper plate 30 may consist of the same material, and may be comprised from a different material depending on the case.

  Although the thickness of the 1st cooling copper plate 20 and the 2nd cooling copper plate 30 is not specifically limited, From the viewpoint of improving electromagnetic force permeability, the thinner one is preferable. However, in order to fasten with the 1st back plate 25 or the 2nd back plate 35 with a volt | bolt, it is preferable that there exists a thickness of 10 mm or more. The upper limit of the thickness of the cooling copper plate is preferably 60 mm or less in consideration of the grinding allowance.

  The first back plate 25 is disposed outside the first cooling copper plate 20 so as to be electrically insulated from the first cooling copper plate 20. Further, the second back plate 35 is disposed outside the second cooling copper plate 30.

  The applied electromagnetic field varies depending on the material of the back plate. When the back plate is made of non-magnetic stainless steel, the attenuation of the electromagnetic field in the mold is small. That is, when it is desired to suppress the magnetic field attenuation in the mold, the back plate is preferably made of nonmagnetic stainless steel, and for example, SUS304, SUS316, SUS310, etc. are suitable. On the other hand, when the back plate is made of copper or copper alloy having high conductivity, the electromagnetic field in the mold is attenuated. This is because when a metal that easily flows electricity is installed inside the coil, a large amount of induced current flows in the direction to cancel the magnetic field. Therefore, when it is desired to attenuate the magnetic field in the vicinity of the cooling copper plate, the back plate is preferably made of copper or copper alloy having high conductivity.

  The thicknesses of the first back plate 25 and the second back plate 35 are preferably determined in consideration of rigidity in order to suppress deformation of the cooling copper plate during casting. For example, in a mold for casting a slab having a long side width of 1 m or more, the thickness is preferably 40 mm or more. Moreover, about the part enclosed with the electromagnetic coil 1, since the loss of the magnetic field by the induced current in a backplate will become large if thickness is more than 70 mm, it is preferable to set it as 70 mm or less. As for the portion not surrounded by the electromagnetic coil 1, the thickness of the back plate is not limited.

  The first back plate 25 is electrically insulated from the first cooling copper plate 20, but for the insulation, for example, an insulator 40 is interposed between the first back plate 25 and the first cooling copper plate 20. Just do it. The insulator 40 is not particularly limited, but an electrically insulating ceramic plate, ceramics formed by thermal spraying, alumina ceramics, zirconia ceramics, mica plates, ceramic fiber molded bodies, polytetrafluoroethylene, and the like are suitable.

  The first back plate 25 is not contacted or electrically insulated from the second cooling copper plate 30 and the second back plate 35. In the case of electrical insulation, the above-described insulator can be used. However, when the first back plate is moved to change the size of the cast slab to be cast, there is a possibility that the insulator may be peeled off by friction, so that it is preferably non-contact.

  The first cooling copper plate 20 and the first back plate 25 are movable, and the size of the cast slab can be changed by changing the size of the space through which the molten metal flows. The means for moving the first cooling copper plate 20 and the first back plate 25 is not particularly limited. For example, a cylinder 50 as shown in FIG. 1 is attached.

  Finally, a continuous casting method using the continuous casting mold of the present invention will be described.

  When the molten metal is continuously cast, the two second cooling copper plates and the side surfaces of the second cooling copper plate are brought into close contact with each other. At this time, the relationship between the electromagnetic coil and the second back plate is constrained so that the electromagnetic coil does not move outward, so that the electromagnetic coil is energized by energizing the electromagnetic coil during continuous casting. The electromagnetic coil will not be deformed even if a force is applied to spread the wire outward.

  When inserting the dummy bar, when cleaning between the first cooling copper plate and the second cooling copper plate, and during the preparation for casting, a gap 16a is formed between the two second cooling copper plates and the side surface of the second cooling copper plate. Become. Even in this case, the electromagnetic coil is coupled to one of the second back plates, but is slidable between the other second back plate. 2 The back plate can be moved.

  A continuous casting mold as shown in FIG. 1 was applied to a slab continuous casting apparatus. The slab to be cast varies in thickness between 250 mm and width between 800 and 1650 mm. In order to change the casting width during casting, the pair of second cooling copper plates 30 (long-side copper plates) are arranged so as to be sandwiched from the side surfaces of the pair of first cooling copper plates 20 (short-side copper plates). The width can be changed by moving the short side copper plate during casting. The material of the 1st cooling copper plate 20 and the 2nd cooling copper plate 30 is an alloy which has copper as a main component.

  A pair of first back plates 25 and a pair of second back plates 35 are provided on the opposite sides of the first cooling copper plate 20 and the second cooling copper plate 30 that are in contact with the molten metal. The material of the back plate was SUS304. The first cooling copper plate 20 and the first back plate 25 on the short side are insulated via an insulator 40. The fastening portion between the first cooling copper plate 20 and the first back plate 25 is also insulated by the insulating sleeve and the insulating washer. The first back plate 25 is electrically insulated from the second cooling copper plate 30 and the second back plate 35 in a non-contact manner or through an insulator. A mica plate was used as the insulator 40.

  A cylinder 50 for changing the width of the slab is attached to the outside of the first back plate 25. The cylinder 50 has a hydraulic control mechanism, and the width can be freely changed online during casting. Furthermore, it has two cylinders in the casting direction, and the inclination of the short side consisting of the first cooling copper plate and the first back plate 25 can be freely changed.

  Of the pair of second back plates 35, the fixed second back plate 35a is fixed to a continuous casting apparatus. Two hydraulic cylinders are attached as the second cooling copper plate moving mechanism 36 outside the second back plate 35b on the moving side, and the interval between the second cooling copper plates can be changed. During the continuous casting, the second cooling copper plate 30 is brought into close contact with the side surface of the first cooling copper plate 20. When inserting the dummy bar, cleaning the first cooling copper plate and the second cooling copper plate, and preparing for casting, a gap 16a is provided between the two second cooling copper plates and the side surfaces of the second cooling copper plate. The position of the second cooling copper plate 30 can be moved up to 10 mm.

  The electromagnetic coil 1 is arranged so as to go around the space 15 where the molten metal flows. The electromagnetic coil 1 is formed of a copper pipe through which cooling water can flow. By applying a current of 60 Hz to the electromagnetic coil 1, an electromagnetic force acts on the solidified shell and molten metal in the mold in a direction away from the mold wall, so that the portion near the mold wall of the meniscus in the mold is convex. Excitement.

  The electromagnetic coil 1 is bound by a spring and is fixed to the second back plate 35a on the fixed side by the fixing tool 11. The second back plate 35 b on the moving side has a sliding surface 2 that is a surface perpendicular to the casting direction 61. The moving coil 1 is slidably disposed on the sliding surface 2 in the long side vertical direction 60.

  A support column 8 is disposed on the sliding surface 2 and the pressing tool 3 is installed on the support column. The electromagnetic coil 1 has an upper sliding surface 9. The tip of the pressing tool 3 has a cylindrical shape with a curvature radius of 30 mm, and the top sliding surface 9 of the electromagnetic coil 1 is pressed with this tip. The pressing tool 3 can press the electromagnetic coil 1 against the sliding surface 2 by the force of the spring. The support column 8 and the pressing tool 3 were arranged at five locations on the sliding surface 2. The pressing force by the pressing tool 3 was 100 kgf per place. The electromagnetic coil 1 is pressed against the sliding surface 2 with a pressing force of 500 kgf in total.

  A stopper 7 is disposed between the support column 8 and the electromagnetic coil 1. The thickness of the stopper 7 is determined so that the stopper 7 and the electromagnetic coil 1 are in contact with each other when the second cooling copper plate 30 is in close contact with the side surface of the first cooling copper plate 20.

  When continuously casting steel, the above-described continuous casting mold of the present invention was used. The mold oscillation was a frequency of 2.2 Hz and an amplitude of 8 mm. Casting was performed at a casting speed in the range of 1.0 to 2.0 m / min. An alternating current was applied to the electromagnetic coil 1 at a frequency of 60 Hz.

  At the time of casting, as shown in FIG. 4A, the two second cooling copper plates 30 and the side surfaces of the first cooling copper plate 20 are brought into close contact with each other. At this time, the relationship between the electromagnetic coil 1 and the second back plate 35 is constrained so that the electromagnetic coil 1 does not move outward, so when the electromagnetic coil 1 is energized during continuous casting. Even when a force was applied to spread the electromagnetic coil 1 outwardly, the electromagnetic coil 1 was not deformed.

  During the dummy bar insertion, during the cleaning between the first cooling copper plate and the second cooling copper plate, and during the preparation for casting, the second cooling copper plate moving mechanism 36 is operated, and as shown in FIG. The second back plate 35 b was moved backward to provide a 10 mm gap 16 a between the two second cooling copper plates 30 and the side surfaces of the first cooling copper plate 20. Also in this case, the electromagnetic coil 1 is coupled to the fixed second back plate 35a, but is slidable between the moving second back plate 35b. The second back plate could be moved without being deformed.

It is a figure which shows the casting_mold | template for continuous casting of this invention, (a) is a top view, (b) is AA arrow sectional drawing, (c) is the elements on larger scale of (b). It is a figure which shows the casting mold for continuous casting of this invention, (a) is a front view, (b) is a figure which shows the insulation condition of the casting_mold | template of this invention. It is a figure which shows the sliding form of the electromagnetic coil in the casting mold for continuous casting of this invention. It is a figure which shows the sliding condition of the electromagnetic coil in the casting mold for continuous casting of this invention, (a) is the state which contact | adhered the 2nd cooling copper plate to the 1st cooling copper plate, (b) is the 1st cooling of the 2nd cooling copper plate. It is a figure which shows the state released from the copper plate. It is a fragmentary perspective view which shows the casting_mold | template for continuous casting of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnetic coil 2 Sliding surface 3 Pressing tool 4 Curved surface 5 Roller 6 Roller 7 Stopper 8 Strut 9 Upper slide surface 11 Fixing tool 15 Space 16 where molten metal circulates Clearance 20 First cooling copper plate 25 First back plate 30 First 2 cooling copper plate 35 2nd back plate 35a 2nd back plate 35b of fixed side 2nd back plate 36 of moving side 2nd cooling copper plate moving mechanism 40 Insulator 50 Cylinder 60 Long side perpendicular direction 61 Casting direction

Claims (7)

An opposing pair of first cooling copper plates and a pair of first cooling copper plates arranged so as to sandwich the pair of first cooling copper plates from the side so as to partition a space in which molten metal flows together with the pair of first cooling copper plates. A pair of second cooling copper plates,
A pair of first back plates fixed to be electrically insulated from the first cooling copper plate outside the first cooling copper plate, and a pair of second plates fixed outside the second cooling copper plate. Back plate,
An electromagnetic coil arranged to circulate in the space through which the molten metal flows,
The distance between the two second cooling copper plates can vary,
The electromagnetic coil is fixed to one second back plate,
A space between the electromagnetic coil and the other second back plate is slidable in the vertical direction (hereinafter referred to as “long side vertical direction”) on the casting side surface of the second cooling copper plate, and is restrained in the casting direction. A continuous casting mold characterized in that the electromagnetic coil is restrained from moving outward when the two second cooling copper plates and the side surfaces of the first cooling copper plate are in close contact with each other.   The continuous casting mold according to claim 1, wherein the second back plate has a sliding surface that slides the electromagnetic coil in the vertical direction of the long side, and the electromagnetic coil is pressed against the sliding surface.   3. The continuous casting mold according to claim 2, wherein the electromagnetic coil is pressed against the sliding surface by hydraulic pressure or spring force.   4. The continuous casting mold according to claim 2, wherein the pressing tool for pressing the electromagnetic coil against the sliding surface has a curved surface or a roller at a contact portion with the electromagnetic coil.   The continuous casting mold according to any one of claims 2 to 4, wherein a roller is disposed at a contact portion between the electromagnetic coil and the sliding surface.   The second back plate has a stopper that restrains the electromagnetic coil, and when the two second cooling copper plates are in close contact with the side surfaces of the first cooling copper plate, the stopper contacts the outer peripheral side of the electromagnetic coil. The continuous casting mold according to claim 1, wherein the casting mold is a continuous casting mold.   The continuous casting mold according to any one of claims 1 to 6, wherein when the molten metal is continuously cast, the two second cooling copper plates and the side surfaces of the first cooling copper plate are brought into close contact with each other, and the dummy bar mounting is performed. At the time of entering, at the time of cleaning between the first cooling copper plate and the second cooling copper plate, a gap is made between the two second cooling copper plates and the side surfaces of the first cooling copper plate during casting preparation. Continuous casting method.

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