JP3577474B2 - Continuous casting mold and continuous casting method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a continuous casting mold and a continuous casting method, and more particularly, to a continuous casting mold having an electromagnetic coil around it and a method of continuously casting by applying an electromagnetic force to molten metal supplied into the mold.
[0002]
[Prior art]
Recently, in the continuous casting technology of molten metal, in order to stabilize the molten metal surface, smoothen the surface of continuously cast slabs, and increase the casting speed, a technology that uses electromagnetic force during casting has recently been developed. Is being developed. Japanese Patent Application Laid-Open No. 52-32824 discloses that, as shown in FIG. 12, an alternating current is supplied to an energizing coil 35 which is disposed so as to surround a mold 31 and is insulated with a refractory material, so that a meniscus of the molten metal 32 is formed. It is disclosed that the surface is improved by curving the portion to promote the inflow of the powder 34 and reducing the contact pressure between the mold and the slab during the initial solidification.
[0003]
In the technology using this electromagnetic force, an induced current is induced in a cooling copper plate constituting a mold by an alternating magnetic field given by an electromagnetic coil, and a magnetic field to be given to a molten metal in the mold is attenuated by its surface effect. In some cases, a mold that suppresses this and has excellent strength has been developed.
[0004]
In Japanese Patent Application Laid-Open No. 2000-246397, as shown in FIG. 11, continuous casting of a molten metal is performed by applying an electromagnetic force to a metal near a meniscus initial solidification portion of a molten metal in a continuous casting mold in a direction perpendicular to the mold wall. In the apparatus, an electromagnetic coil 35 for supplying an alternating current to the outer peripheral surface of the mold 31, a pair of first cooling copper plates 39, a back plate 41 made of nonmagnetic stainless steel combined with the copper plates, and a pair of , A plurality of divided cooling units including a back plate 42 made of non-magnetic stainless steel combined with the copper plate, and an insulator 46. Each of the first cooled copper plate and the second The second cooling copper plate has at least one groove on the surface opposite to the casting surface and is combined with the first and second cooling copper plates. By tightly sealing and fixing the surfaces of the first and second cooling copper plates having the grooves, the grooves form cooling passages 43, and the first cooling copper plate and the second cooling copper plate Are electrically insulated through an insulator 46, and the back plate combined with the first cooling copper plate and the back plate combined with the second cooling copper plate are electrically insulated from each other. And a mold that is fastened.
[0005]
[Problems to be solved by the invention]
In the mold of the continuous casting apparatus disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2000-246397, the loss of electromagnetic force can be reduced, and the processing accuracy and the assembly accuracy can be secured by dividing the entire length of each side of the mold as a unit. There is an advantage.
[0006]
However, in this mold, as shown in FIG. 10 which is a schematic cross-sectional view in which a corner portion of a mold in which a cooling copper plate is combined is enlarged, an insulator 46 for electrically insulating the cooling copper plate has only a mating surface 48. Molten metal penetrates into the gaps created by repeated use of the mold due to wear of the mating surface, and the splash of molten metal during casting adheres near the corner of the mold wall. In addition, it is inevitable that the insulating property is reduced near the mating surface of the cooling copper plate or the pack plate of the mold and near the corner of the mold. In such a case, an induced current flows through the cooling copper plate of the mold due to a magnetic field that has penetrated into the cooling copper plate by the electromagnetic coil arranged around the mold, and an induced magnetic field to be applied to the molten metal in the mold due to its surface effect. In addition to the attenuation, there is a problem that an increase in the heat generated by the mold also affects the formation of a solidified shell of the molten metal.
[0007]
In the continuous casting method, many proposals have heretofore been made with respect to a technique for controlling the formation of a solidified shell and controlling its influence on slab quality. For example, Japanese Unexamined Patent Publication No. 5-57412 discloses that a breakout in which the molten metal in the mold flows out due to the destruction of the solidified shell is described in FIG. In the method of monitoring the temperature at each position detected by the plurality of temperature detecting means 36 embedded at different positions and predicting the restrictive breakout, each detected temperature of the temperature detecting means is sampled, and at each detection time, A breakout prediction method is disclosed in which a standard deviation of a temperature gradient is calculated, and a value obtained by multiplying the standard deviation by a predetermined coefficient α is used as a threshold for determining solidification shell fracture occurring at the time of restrictive breakout.
[0008]
Further, in relation to the slab quality, Japanese Patent No. 3093586 proposes a prediction method for predicting the occurrence of vertical cracks in a continuously cast slab at an early stage and appropriately reflecting the result in a preventive measure. This is because, as shown in FIG. 14, the mold walls appearing in the temperature detection rows 51a and 51b having a plurality of temperature detection points 50a and 50b in the casting direction of the mold installed in the width direction of the mold 31 of the continuous casting machine. In this method, an index of a casting defect is indexed using a first-order lag and a covariance value based on a time-series change in temperature, and the occurrence of the vertical crack nucleus 52 is determined based on the magnitude of the index.
[0009]
For these breakout and vertical crack detection methods, the mold is provided with a plurality of temperature detection means, but the aim is to measure the mold temperature as a reflection of the state of the solidified shell, and in each case, the temperature of the mold is measured. It is arranged around the plane corresponding to the solidification plane. When performing continuous casting while applying an electromagnetic force to a molten metal by an electromagnetic coil, a technique for solving the above-described problems, stabilizing the operation, and obtaining a high-quality slab has not been proposed.
[0010]
The present invention provides, in a continuous casting apparatus having an electromagnetic coil, a continuous casting mold that can accurately detect a decrease in the insulation of the mold even during operation, enables stable operation, and reduces the magnetic field strength. An object of the present invention is to provide a continuous casting method capable of minimizing the influence on slab quality.
[0011]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has the following configuration as a gist.
[0012]
(1) In a continuous casting mold of a continuous casting apparatus having an electromagnetic coil, the mold includes a pair of first cooled copper plates sandwiched between a pair of second cooled copper plates, and the first cooled copper plate and the pair of first cooled copper plates. The mating surface with the second cooling copper plate is electrically insulated from each other via an insulator, and further has a height corresponding to the installation height of the electromagnetic coil at a corner of the cooling copper plate. A mold for continuous casting, wherein a temperature measuring element is provided within a range of ± 100 mm in a direction.
[0013]
(2) The continuous casting mold according to (1), wherein the temperature measuring element is a thermocouple, a resistance temperature detector, or an optical fiber thermometer.
[0014]
(3) The method according to (1) or (2), wherein the electromagnetic coil provided around the continuous casting mold is energized to continuously cast while applying an electromagnetic force to the molten metal supplied from the immersion nozzle into the mold. A continuous casting method, wherein when a temperature measured value of the temperature measuring element or a rising speed of the temperature measured value becomes equal to or more than a predetermined value, energization to the electromagnetic coil is stopped or a current value is decreased.
[0015]
(4) The method according to (1) or (2), wherein the electromagnetic coil provided around the continuous casting mold is energized to continuously cast while applying an electromagnetic force to the molten metal supplied from the immersion nozzle into the mold. A continuous casting method, wherein the casting speed is reduced or the casting is stopped when the temperature measured value of the temperature measuring element or the rate of increase of the temperature measured value becomes a predetermined value or more.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings of the embodiments.
[0017]
FIG. 1 is a perspective view showing the concept of assembling the continuous casting mold of the present invention, and FIG. 2 is a schematic horizontal sectional view of the continuous casting mold of the present invention assembled in this manner. 1 and 2, a continuous casting mold of the present invention includes a first opposed cooling copper plate 1, 1 (usually on the short side of the mold) and a second opposed cooling copper plate 2, 2 (usually, the long side of the mold) forms a mold wall surface. Further, on the back surface of these cooled copper plates, that is, the surface of the cooled copper plate opposite to the side in contact with molten steel, the first cooled copper plate 1, A pair of first back plates 5,5 combined with and supporting the first cooling plate 1 and a pair of second back plates 6,6 combined with and supporting the second cooling copper plates 2,2 are provided. Can be Further, the mating surface 12 between the first cooling copper plate and the second cooling copper plate sandwiching the first cooling copper plate is electrically insulated by the insulators 3 and 4 and sandwiches the back plates 5 and 5 therebetween. The back plates 6, 6 are electrically insulated and fastened.
[0018]
The back plate is preferably made of non-magnetic stainless steel, and has a gap 13 between the back plate 5 and the back plate 6 combined therewith, and is electrically insulated by the fastening bolt 9 and fastened and fixed. You. That is, the insulating washer 10 and the insulating sleeve 11 are interposed between the head and the shaft of the fastening bolt 9 and the outer peripheral surface of the back plate 6 and the inner surface of the bolt hole, and are thereby electrically insulated. Fastened and fixed.
[0019]
An electromagnetic coil 8 for supplying a current for applying a magnetic field to the molten metal in the mold at the time of casting is provided on the outer periphery of the mold configured as described above. Note that in the present invention, an insulator refers to an electrical insulator.
[0020]
FIG. 3 is a perspective view showing a corner portion of a cooled copper plate constituting the continuous casting mold of the present invention. As shown in FIG. 3, a plurality of temperature measuring elements 7 are provided at one or more corners (shown by oblique lines) formed by the first cooling copper plate 1 and the cooling copper plates 2 and 2.
[0021]
FIG. 4 is a horizontal sectional view of a corner portion of FIG. As shown in FIG. 4, the corner of the cooling copper plate on which the temperature measuring element 7 is installed is, as shown in FIG. 4, the length of the cooling copper plate 2 on the side (usually, the long side) on which the other cooling copper plate 1 is sandwiched. A rectangular area (shown by oblique lines) on the cooling copper plate formed by intersecting the virtual lines 15a, 15b in the vertical direction and the virtual lines 14a, 14b in the length direction of the cooling copper plate 1 on the sandwiched side, Depending on the shape of the mating surface of the water-cooled copper plate, there are cases where only one of the cooled copper plates is included as shown in FIG. 4 and cases where both of the cooled copper plates are included as shown in FIGS. 5 (a) to 5 (d). The present invention includes both.
[0022]
Therefore, the temperature measuring element may be provided on at least one of the cooling copper plates 1 or 2 constituting the corner portion.
[0023]
As described above, this corner portion includes at least the mating surface of the first cooling copper plate and the second cooling copper plate, and is electrically insulated by the insulator. However, as shown in FIG. 10, when a short circuit occurs due to abrasion of the mating surface 48 of the cooling copper plate, adhesion of the molten metal splash to the cooling copper plate, or when an excessive induced current flows for some reason, this mating is performed. This is a place where heat generation on the surface is likely to be large and a temperature change due to a change in the induced current is likely to appear. In addition, the corner portion is less susceptible to a change in the temperature of the mold due to a change in the solidification state of the molten metal than other portions, and is suitable for more accurately detecting heat generated by the induced current. In the present invention, it is for such a reason that the temperature measuring element is provided at this corner.
[0024]
FIG. 6 is a schematic vertical sectional view of the mold of the present invention shown in FIG. As shown in FIG. 6, the temperature measuring element 7 is provided at the corner of the cooling copper plate and within a range of ± 100 mm in the height direction corresponding to the installation height of the electromagnetic coil of the cooling copper plate. This is because the generation of the induced current is strongest at the center position of the height of the electromagnetic coil and decreases as the distance from the center increases. If the installation height of the temperature measuring element 7 exceeds the range of ± 100 mm of the installation height of the coil, temperature fluctuation due to a change in the induced current is unlikely to appear, so that it is limited to the above range. In order to monitor the strength of the magnetic field, it is preferable to install the sensor at such a position that the change in the induced current can be detected with the highest sensitivity. As shown in FIG. In the height direction of the mold, within the range of the position corresponding to the installation height of the electromagnetic coil, preferably including a position corresponding to the height center position of the electromagnetic coil, at appropriate intervals, in the height direction It is preferable to provide a plurality. The electromagnetic coil is installed at the center of the height because the induced current flows most easily, and if a short circuit occurs at that location, it is preferable because the temperature rise is large. It is preferable to install a plurality in the height direction in that all short circuits near the coil are detected. It is preferable that the temperature measuring elements are provided at all corners of the mold to monitor the temperature change at the corners, but may be provided at one corner.
[0025]
As the temperature measuring element, a thermocouple using a thermoelectromotive force, a thermistor using a temperature change of resistance, a temperature measuring resistor such as a platinum resistance thermometer, or the like can be suitably used. Alternatively, it is also preferable to use an optical fiber thermometer using a refractive index.
[0026]
These temperature measuring elements may be provided by providing holes at the corners of the cooling copper plate and within a range of ± 100 mm in a height direction corresponding to the installation height of the electromagnetic coil, and embedding the temperature measuring elements. it can. In the case of optical fibers, all four corners can be measured by providing one optical fiber at one of four corners instead of installing a plurality of optical fibers.
[0027]
As described above, in the casting mold of the present invention, an insulating material is provided on the mating surface 12 of the first cooling copper plate 1 and the second cooling copper plate 2 disposed to sandwich the first cooling copper plate 1 so as to be electrically insulated. However, this insulator is disposed on one or both surfaces of the cooling copper plate 1 and the cooling copper plate 2. That is, FIG. 7 is a schematic horizontal sectional view of the vicinity of the mating surface of the cooling copper plate at the corner of the continuous casting mold of the present invention shown in FIG. 2, but in the example shown in FIG. The insulators 3 and 4 are provided on both the mating surface 12 of the first cooling copper plate 1 and the second cooling copper plate 2 interposed therebetween, as shown in FIG. May be provided on either surface of the cooling copper plate 1 and the cooling copper plate 2 as shown in FIGS. 7B and 7C.
[0028]
The insulator provided on the mating surface may be an electrically insulating material having heat resistance, but is preferably an electrically insulating ceramic having excellent wear resistance. As such ceramics, alumina-based ceramics, zirconia-based ceramics, and the like can be applied. To provide an insulator on the mating surface of the cooling copper plate, an insulator, for example, a ceramic plate such as alumina or zirconia is bonded to a predetermined portion of the cooling copper plate with an adhesive (ceramic), a heat-resistant inorganic adhesive, or the like. It can be appropriately adopted such as a method or a method of spraying and forming a powder of an insulator on the surface of a copper plate by a plasma or gas spraying method.
[0029]
In order to confirm the effect of detecting abnormal induction current, for example, a decrease in insulation, in the continuous casting mold of the present invention, a water-cooled mold having an inner size of 1500 mm × 250 mm and a height of 800 mm was replaced with a copper plate having a thickness of 20 mm. A back plate made of non-magnetic stainless steel having a thickness of 50 mm is provided on the back surface thereof, and an electromagnetic coil having a coil height of 120 mm is provided on the outer periphery of the mold. did. However, as shown in FIG. 7B, the insulation of the mating surface is performed by spraying a zirconia-based ceramic onto the mating surface of the first cooling copper plate 1 to form an insulator 3 having a thickness of 0.5 mm × a width of 20 mm × a height of 800 mm. Was formed.
[0030]
An insulating washer 10 and an insulating sleeve 11 were provided on the contact surface between the outer surface of the second back plate 6 and the inner surface of the bolt hole and the head and shaft of the fastening bolt 9 to insulate the back plates.
[0031]
Further, a thermocouple as the temperature measuring element 7 is provided at a position 10 mm deep from the corner end surface of the second cooling copper plate, 10 mm deep from the outer peripheral surface, and at the center of the installation height of the electromagnetic coil and the electromagnetic coil. The distance from the lower end to the upper end of each was set at a total of seven locations at a pitch of 20 mm, and provided at four corners.
[0032]
An iron having a thickness of 1 mm, a width of 5 mm, and a length of 5 mm was placed on the outer peripheral surface of the joining portion of the first cooling copper plate and the second cooling copper plate of the mold and at a position corresponding to the height center position of the electromagnetic coil. The plates were welded to short-circuit the cooled copper plate of the mold, and the insulation level of the mold was changed to three levels of no short-circuit, two-sided short-circuit, and four-sided short-circuit.
[0033]
A state in which an alternating current of 100 Hz is applied to the electromagnetic coil 8, the temperature at each corner is measured, and the magnetic field strength at the position corresponding to the center position of the electromagnetic coil installation height, and at the center position of the mold width and thickness is measured. The measurement was performed, and the ratio between the magnetic field strength at each time point and the magnetic field strength in the initial state, that is, the relative magnetic field strength was investigated. FIG. 8 shows the relationship between the insulation level of the mold, the temperature at the point corresponding to the center position of the coil height, and the relative magnetic field strength.
[0034]
As can be seen from FIG. 8, the relative magnetic field strength decreases as the insulation level of the two-sided short-circuit and the four-sided short-circuit and the mold decreases, and the maximum temperature among the four corners × 7 monitor points of the cooled copper plate of the mold becomes It is rising. From this, it can be seen that by monitoring the temperature of the corner portion, it is possible to detect a decrease in the insulating property and an abnormality of the induced current flowing through the mold due to other reasons, that is, a decrease in the magnetic field strength.
[0035]
In the mold of the present invention, the method of cooling the cooling copper plate may be such that a water cooling passage is provided between the copper plate and the back plate as disclosed in Japanese Patent Application Laid-Open No. 2000-246397, or the cooling inside the copper plate. Well-known methods, such as providing a waterway, can be adopted.
[0036]
As described above, the continuous casting mold of the present invention is provided with the temperature measuring element at the corner of the cooling copper plate constituting the mold and near the position corresponding to the installation height of the electromagnetic coil. Thus, the temperature of the mold can be measured and the change can be detected.
[0037]
That is, detecting this temperature change is to detect a change in heat generation due to an induced current induced in the mold by a current-carrying coil installed around the mold. It is possible to detect an abnormality of the coil or the like at an early stage and accurately grasp the attenuation of the electromagnetic force to be applied to the molten metal in the mold.
[0038]
Therefore, using the continuous casting mold of the present invention as described above, while supplying molten metal from the immersion nozzle to this, while energizing the electromagnetic coil, during continuous casting, in the corner of the cooling copper plate of the mold Monitor the temperature measurement value provided by the temperature measurement element provided, if the temperature measurement value exceeds a certain value, or if there is a change such as the rise rate of the temperature measurement value (temperature rise rate) exceeds a certain value, It is possible to take appropriate measures by assuming that the electromagnetic force applied to the molten metal is attenuated and abnormalities such as solidification delay due to local heat generation of the mold are caused. As the temperature measurement value, temperature data at the same measurement point can be used, or maximum temperature data at the same corner portion or temperature data at all measurement points can be used.
[0039]
In other words, by stopping the energization of the electromagnetic coil, or by performing energization control such as lowering the current value, the temperature rise of the mold is suppressed to reduce the effect on solidification, so that casting can be continued, or It is also possible to adopt measures such as lowering the casting speed to ensure the progress of solidification, or to control casting conditions such as interrupting casting when the temperature change is rapid and large.
[0040]
【Example】
A mold having a water-cooled structure with an inner dimension of 1500 mm x 250 mm and a height of 800 mm is made of a 20 mm thick copper plate, and a 50 mm thick nonmagnetic stainless steel back plate is provided on the back of the mold to form a mold. Then, an electromagnetic coil having a coil height of 120 mm was installed on the outer periphery of this mold, and a horizontal cross-sectional shape was obtained as shown in FIG. However, as shown in FIG. 7 (b), the insulation of the cooling copper plate is performed by spraying a zirconia-based ceramic on the mating surface of the first cooling copper plate 1 so as to have a thickness of 0.5 mm × a width of 20 mm × a height of 800 mm. Object 3 was formed.
[0041]
An insulating washer 10 and an insulating sleeve 11 were provided on the contact surface between the outer surface of the second back plate 6 and the inner surface of the bolt hole and the head and shaft of the fastening bolt 9 to insulate the back plates.
[0042]
In addition, a thermocouple as the temperature measuring element 7 is placed at a position 10 mm deep from the corner end surface of the second cooling copper plate and 10 mm deep from the outer peripheral surface, and at a position corresponding to the center of the installation height of the electromagnetic coil. In addition, the interval from the lower end to the upper end of the electromagnetic coil was set to a total of seven places at a pitch of 20 mm, and provided at four corners.
[0043]
S45C molten steel (not shown) was supplied into the mold from an immersion nozzle, and an alternating current of 100 Hz was applied to the electromagnetic coil 8 to perform casting.
[0044]
The temperature at each point of the corner was measured, and the change in temperature at each point was monitored. The temperature at each point in the early stage of casting was 40 to 60 ° C. FIG. 9 shows a temperature history near an abnormal occurrence point during casting. Although a magnetic field was applied at the position of 100 seconds in FIG. 9, the temperature rose rapidly (+ 50 ° C.), so the current was immediately stopped to continue casting, and the casting of molten steel of the charge was completed. With this mold, when the molten steel of the other charge was energized to the electromagnetic coil and the casting was repeated, an abnormality occurred after casting for a total of about 100 hours, and the maximum temperature of the temperature measuring elements at all measuring points suddenly reached 105 ° C. , The current to the electromagnetic coil was stopped, the casting speed was reduced from 2.0 m / min to 1.0 m / min, casting was continued, and casting was completed.
[0045]
After the casting was completed, the cooling copper plate of the mold was confirmed. As a result, the insulating portion was short-circuited due to the adhesion of the metal in the range of 10 mm in the casting direction at the corner near the abnormal temperature, and the insulation was defective.
[0046]
As described above, by monitoring the temperature of the corner portion, it was confirmed that a decrease in the insulating property could be detected in advance, and stable casting could be performed.
[0047]
【The invention's effect】
In the continuous casting mold of the present invention, a plurality of temperature measuring elements are provided at a corner portion of a cooling copper plate constituting the same, and near a position corresponding to the installation height of the electromagnetic coil. Thus, the temperature of the mold can be measured and the change can be detected. That is, it is possible to detect a change in heat generation due to an induced current induced in the mold by the electromagnetic coil provided around the mold. This allows early detection of a decrease in insulation of the mold, abnormalities in the electromagnetic coil, etc., and appropriate measures such as controlling the current to the energized coil and adjusting the casting speed, and stabilizing the insulation of the mold. As a result, high quality slabs can be obtained over a long period of time.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of assembling a continuous casting mold according to the present invention.
FIG. 2 is a schematic horizontal sectional view of the continuous casting mold of the present invention.
FIG. 3 is a perspective view of a corner portion made of a cooled copper plate of the continuous casting mold of the present invention.
FIG. 4 is a schematic horizontal sectional view showing an arrangement of a temperature measuring element in a corner portion of a continuous casting mold according to the present invention, which is formed by a cooled copper plate.
FIG. 5 is a schematic horizontal cross-sectional view showing another example of the arrangement of the temperature measuring elements at the corners formed by the cooled copper plate of the continuous casting mold of the present invention, wherein (a) and (c) show cooling. (B) and (d) show the situation where the temperature measuring elements are arranged on the cooling copper plate 1 respectively.
FIG. 6 is a schematic vertical sectional view taken along line AA of FIG. 2;
FIGS. 7A and 7B are schematic horizontal cross-sectional views showing an arrangement state of an insulator on a mating surface of a cooling copper plate of the continuous casting mold of the present invention, wherein FIG. 7A shows both mating surfaces, and FIG. (C) shows a situation where an insulator is disposed on one of the mating surfaces, respectively.
FIG. 8 is a diagram showing the relationship between the insulation level of the mold, the relative magnetic field strength, and the temperature of the measurement point at a position corresponding to the center position of the electromagnetic coil installation height in the continuous casting mold of the present invention.
FIG. 9 is a diagram showing a temperature history near the time of occurrence of an abnormality in an abnormally generated charge in which a temperature abnormality has occurred during casting.
FIG. 10 is a schematic horizontal sectional view of a corner portion of a conventional continuous casting mold formed of a cooled copper plate.
FIG. 11 is a horizontal sectional view of a conventional continuous casting mold.
FIG. 12 is a conceptual diagram showing a continuous casting technique for applying an electromagnetic force.
FIG. 13 is a perspective view showing temperature measurement points for detecting breakout in a conventional continuous casting mold.
FIG. 14 is a perspective view showing temperature measurement points for detecting a vertical crack nucleus in a conventional continuous casting mold.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... 1st cooling copper plate 2 ... 2nd cooling copper plate 3 ... Insulator of the mating surface of a 1st cooling copper plate 4 ... Insulator of the mating surface of a 2nd cooling copper plate 5 ... 1st back plate 6 ... 2 back plate 7 temperature measuring element 8 electromagnetic coil 9 fastening bolt 10 insulating washer 11 insulating sleeve 12 cooling copper plate mating surface 13 gaps 14a and 14b virtual first cooling copper plate length direction Wires 15a, 15b: virtual line 31 in the longitudinal direction of the second cooling copper plate 31: mold 32, molten metal 33, meniscus 34, powder 35, energizing coil 36, temperature detecting means (thermocouple)
38 immersion nozzle 39 first cooling copper plate 40 second cooling copper plate 41 back plate 42 combined with the first cooling copper plate back plate 43 combined with the second cooling copper plate 43 cooling water passage 44 fastening Bolt 45 ... Insulation fastening bolt 46 ... Insulator 47 ... Sealing material 48 ... Mating surface 49 ... Casting surface 50a, 50b ... Temperature detection point 51a, 51b ... Temperature detection row 52 ... Vertical crack nucleus

Claims (4)

In a continuous casting mold of a continuous casting device having an electromagnetic coil, the mold includes a pair of first cooling copper plates sandwiched between a pair of second cooling copper plates, and the first cooling copper plate and the second cooling copper plate. The mating surface with the cooling copper plate is electrically insulated from each other via an insulator, and at a corner of the cooling copper plate, and in a height direction ± 100 mm corresponding to the installation height of the electromagnetic coil. A casting mold for continuous casting, wherein a temperature measuring element is provided within the range. 2. The continuous casting mold according to claim 1, wherein the temperature measuring element is a thermocouple, a resistance temperature detector, or an optical fiber thermometer. 3. A method according to claim 1 or 2, wherein the electromagnetic coil provided around the mold is energized to continuously cast while applying an electromagnetic force to the molten metal supplied from the immersion nozzle into the mold. A continuous casting method characterized in that, when the rate of increase of the temperature or the measured value exceeds a predetermined value, the energization of the electromagnetic coil is stopped or the current value is decreased. 3. A method according to claim 1 or 2, wherein the electromagnetic coil provided around the mold is energized to continuously cast while applying an electromagnetic force to the molten metal supplied from the immersion nozzle into the mold. A continuous casting method characterized by lowering the casting speed or stopping the casting when the rate of increase of the temperature or temperature measurement value exceeds a predetermined value.

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