JPH10314909A - Mold for continuous casting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately measure the surface temp. of copper plate of a mold by embedding insulated thermocouple wires into the copper plate provided with coating layer at the casting side and making short-circuit of the tip parts of the exposed tip part with an electric conductive meter. SOLUTION: The mold A for continuous casting forms a rectangular shape hollow part surrounded with mold long pieces 3a, 3b composed of the copper plate 1 having 20-60 mm thickness and a water-cooling box 2 integrally arranged by a fastening means of bolts and nuts and mold short pieces 3c, 3d composed of the copper plate 1 and the water cooling box 2, and this shape is held with a mold supporting device. On the surfaces of the copper plates 1 at the casting side of these mold long sides 3a, 3b and the mold short sides 3c, 3d, coating layer 1a with a chromium plating is arranged. The formation of the coating layer 10 can be executed with thermal-spraying or padding, etc., besides the plating. The thermocouple wires 8b are exposed on the surface of the copper plate 1, and exposed tip parts are connected with the electric conductive metal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting mold provided with a thermocouple wire for detecting a molten metal level in a casting mold, a solidification state of molten steel in the casting mold, a breakout, and the like.

[0002]

2. Description of the Related Art Generally, continuous casting of molten steel is performed by using a copper plate having excellent thermal conductivity or a mold in which a coating layer made of an alloy composition is formed on the copper plate while cooling and solidifying the molten steel in the mold. To produce a cast slab by drawing it downward. In the early stage of casting using this mold, the balance between the amount of molten steel injected from the upper part of the mold and the drawing speed is adjusted so that the level of the molten metal in the mold (molten steel level) is not maintained and the outlet of the dip tube is not exposed. It is precisely adjusted. By adjusting the amount of molten steel injected and the drawing speed, it is possible to prevent casting accidents due to overflow of molten steel from the mold and deterioration of cast slab quality due to exposure of the discharge port of the immersion pipe. In addition, in a steady operation after the start of continuous casting, it is difficult to always secure a solidified shell (a portion where molten steel solidifies in the mold) to a predetermined thickness due to uneven cooling in the mold. In such a case, there is a problem that a breakout occurs and the molten steel leaks, causing a stoppage of the casting operation or damage to the casting machine due to the scattering of the molten steel.

Accordingly, in order to prevent the above-described breakout in the initial stage of casting or in a steady operation, for example, as shown in Japanese Patent Publication No. Sho 56-7783, two short sides of a four sided copper plate are thermoelectrically charged. It is disclosed that a pair is attached and a breakout is detected when a solidified shell is confined in a mold from the temperature difference between the thermocouples on the short side.
Also, as shown in Japanese Patent Application Laid-Open No. 56-141955,
Excellent heat sensitivity by making a hole in the copper plate on the non-casting side of the mold, inserting a thermocouple wire covered with a non-conductive insulator at the other end into this hole, and arc welding the tip to the copper plate A mold provided with a thermocouple wire capable of measuring temperature is used for casting.

[0004]

However, any of the above-mentioned molds provided with thermocouple wires are perforated on the non-casting side of a copper plate constituting the mold, and a thermocouple wire is inserted into this hole to form a tip. It is a joined structure. Residual copper plate thickness 20 against the casting side of mold copper plate in contact with molten steel or solidified shell
３０30 mm (total thickness of 40-60 mm). Since the temperature on the casting side is measured with the remaining thickness of the copper plate interposed, the generated abnormal temperature is diffused by the remaining copper plate having high thermal conductivity, and accurate temperature measurement cannot be performed. In addition, since the cooling water flows through the water-cooling box on the anti-casting side, the joint between the copper plate and the tip of the thermocouple wire is flooded, and the disturbance caused by the flooded water causes an error in the measurement temperature. Occur. In addition, the copper plate on the side of the casting,
Each time the casting is finished, the surface is reworked and used again for casting.However, since a thermocouple is drilled on the opposite side of the casting and a thermocouple is attached, there is a limit to the reworking and reuse due to the restriction of the remaining thickness of the copper plate, and an expensive mold Has a problem that the life of the device is greatly reduced.

The present invention has been made in view of such circumstances, and has an accurate measurement of a surface temperature of a copper plate of a mold used for continuous casting, a temperature error caused by a disturbance is accurately detected, and an occurrence phenomenon is accurately detected. It is an object of the present invention to provide a continuous casting mold that enables extreme reuse by reshaping the surface of a copper plate on the side.

[0006]

According to the present invention, there is provided a semiconductor device comprising:
The continuous casting mold according to the present invention is provided with a coating layer on the surface of a copper plate on the casting side, and in a continuous casting mold having a water-cooling box on the non-casting side of the copper plate, insulated in the copper plate on the casting side. A thermocouple wire is buried, the exposed tip of the thermocouple wire is exposed on the surface of the copper plate, and the tip of the thermocouple wire is short-circuited with a conductive metal.

According to a second aspect of the present invention, in the continuous casting mold according to the first aspect, the insulated thermocouple wire is joined to the copper plate with a brazing material.

According to a third aspect of the present invention, in the continuous casting mold according to the first or second aspect, the insulated thermocouple wire is fitted in a metal sheath. Since the thermocouple wire is provided in the metal sheath as described above, the overall strength of the thermocouple wire formed by the metal sheath can be improved, and bending workability can be imparted.

A continuous casting mold according to a fourth aspect of the present invention is the continuous casting mold according to any one of the first to third aspects, wherein one of the thermocouple wires is connected to the copper plate. Consisting of a ground wire.

A continuous casting mold according to a fifth aspect of the present invention is the continuous casting mold according to any one of the first to fourth aspects, wherein the thermocouple wire is provided on a mating surface of two divided copper column pieces. The embedded thermocouple unit is embedded in the surface of the copper plate on the casting side.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. FIG. 1 is a plan view schematically showing an entire continuous casting mold according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line BB in FIG. 1, and FIG. 3 is a thermocouple wire in FIG. FIG. 4 is a partially enlarged view of a buried portion of the thermocouple wire when the thermocouple wire is fitted in a metal sheath, and FIG. 5A is a second embodiment of the present invention. FIG. 5 is a partially enlarged view of an embedded portion of a thermocouple wire of a continuous casting mold according to the present invention.
(B) is a partially enlarged view of a buried portion of the thermocouple wire when the thermocouple wire is fitted in a metal sheath, and FIG. 6 is a continuous casting mold according to a third embodiment of the present invention; FIG. 7 is an overall perspective view of a thermocouple wire unit embedded in the surface of the copper plate of FIG. 7, FIG. 7 is a partially enlarged view of an embedded portion of the thermocouple wire, and FIG. 8 is an overall perspective view showing the configuration of the thermocouple wire unit. 9 is an overall perspective view in the case where the thermocouple unit is constituted by triangular prism pieces.

First, a casting mold for continuous casting according to a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the continuous casting mold A has a thickness of 20 to 6 mm.
Molded strips 3a and 3b each comprising a water cooling box 2 provided integrally with a 0 mm copper plate 1 by fastening means such as bolts and nuts (not shown), and a copper plate 1 and a water cooling box 2 as described above. A rectangular cavity surrounded by the mold short pieces 3c and 3d is formed, and this shape is maintained by a mold support device (not shown). A coating layer 1a by chrome plating is provided on the surface of the copper plate 1 on the casting side of the mold long pieces 3a, 3b and the mold short pieces 3c, 3d. This coating layer 1a had a thickness of 1 mm. The formation of the coating layer 1a can be performed by thermal spraying or overlaying in addition to plating. Further, as shown in FIG. 2, a water cooling box 2 provided on the anti-casting side of the copper plate 1 is provided with a cooling water supply pipe 4 for supplying cooling water and cooling water flow paths 5 and 6. The copper plate 1 is cooled with water. The cooling water circulates from the cooling water supply pipe 4 to the flow path 6 from the flow path 5 at a pressure of ² to 5 kg / cm ² , and flows from the discharge port 7 to the outside of the system. Furthermore,
As shown in FIG. 1 and FIG. 2, the mold long pieces 3a and 3b have
Thermocouple wires 8a to 8h are provided, and as shown in FIG. 2, thermocouple wires 8b 'and 8b' are provided below thermocouple wires 8b and 8f, respectively.
8b "and 8f ', 8f" are provided in multiple stages. Similarly, the thermocouple wires 8a to 8h also
a ', 8a "to 8h', 8h" (not shown) are provided in multiple stages. Since each of them has the same configuration, the thermocouple wire 8b will be described as a representative here. As shown in FIGS. 2, 3 and 4, the thermocouple wire 8 b buried in the continuous casting mold strip 3 a is composed of a thermocouple wire 9 using constantan and a thermocouple wire 10 using copper, This thermocouple wire 8b
Is covered with a nonconductive insulator 11 and is embedded in a hole 12 formed in the copper plate 1 and a hole 13 formed in the water-cooling box 2. In addition, the perforation of the copper plate 1 and the water-cooled box 2 can be performed by a general perforation means such as a drill.

The ends 9a and 10a of the thermocouple wire 9 and the thermocouple wire 10 constituting the thermocouple wire 8b are exposed on the surface of the copper plate 1, and the exposed tips 9a and 10a are
The conductive metal is connected by welding, thermal spraying, brazing, or the like to form a short-circuit portion 14. The thermocouple wire 9 and the thermocouple wire 10 can be electrically connected via the short-circuit portion 14. Further, the surface of the thermocouple wire 8b is covered with an insulator 11 having a thickness of 100 μm, and a copper brazing material 15 is poured between the hole 12 formed in the copper plate and the insulator 11 to be integrally joined to the copper plate 1. It is. The side of the water-cooled box 2 of the thermocouple wire 8b is inserted into a hole 13 formed in the water-cooled box 2, an O-ring 16 is provided between the water-cooled box 2 and the thermocouple wire 8b, and a flange 17 and a bolt nut (not shown) are provided. Zu) and other fastening means,
It is fixed to the water cooling box 2. The thermocouple wire 9 and the thermocouple wire 10 of the thermocouple wire 8b are taken out through the water-cooled box 2 and are output to a temperature indicator 18 provided with an electromotive force temperature converter.
Is configured to be displayed. In addition, thermocouple wire 8b
The gap between the diameter of the copper plate 1 and the hole 12 of the copper plate 1 is set to 2 to 6 mm, and the diameter of the flow path 6 of the cooling water is enlarged to the tapered hole 19 so that the brazing material 15 can be easily poured.

Although the copper plate 1 is made of copper, an alloy mainly composed of copper may be used. The coating layer 1a provided on the surface (casting side) of the copper plate 1 is also made of chromium plating. Chromium or a heat and wear resistant alloy of chromium or a combination thereof may be formed by thermal spraying, overlaying, or the like, and the thickness is 0.2 mm to 5 mm. The surface of the copper plate 1 on the casting side is the surface of the coating layer 1a on the side of the molten steel or the lubricating powder interposed between the molten steel and the coating layer 1a. The paired wire 8b has a diameter of 1.0-7.
0 mm. If the diameter of the thermocouple wire 8b is smaller than 1.0 mm, it is easy to break due to vibrations during mounting on the copper plate 1 or during use. If the diameter is larger than 7.0 mm, restrictions on the place to be mounted on the copper plate 1 and restrictions on the copper plate 1 The heat removal characteristics of the surface are inhibited. Further, as the thermocouple wire 8b, a combination of constantan and copper was used. In addition, constantan, chromel, alumel, nickel, iron, platinum,
Platinum rhodium, aluminum, copper and the like can be used in combination. As the non-conductive insulator 11 for insulating the surface of the thermocouple wire 8b, for example, a material such as alumina, silicon nitride, zirconia, sialon, magnesia, or alumina can be used. is there. Insulator 1 for insulating this thermocouple wire 8b
1 has a thickness of 1 to 1000 μm, and if it is thinner than 1 μm, the insulating property is reduced. Also,
Exposed tip 9 of thermocouple wires 9 and 10 of thermocouple wire 8b
When the short-circuit portion 14 is formed by using a conductive metal in “a” and “10a”, a non-conductive substance is mixed as an impurity, so that the reliability of electrical conduction is reduced. For this reason, the thickness of the insulator 11 of the thermocouple wire is preferably 10 to 50 μm.

The insulator 11 of the thermocouple wire 8b can be formed by applying the above-mentioned non-conductive material by plasma spraying, flame spraying, ion deposition or the like. Reference numeral 11a denotes an insulating layer that insulates the thermocouple wires 9 from the thermocouple wires 10, and is filled with the same non-conductive material as the insulator 11. Further, in order to join the thermocouple wire 8b to the copper plate 1, a copper brazing material (copper brazing) 15
Although the mixture was heated to 980 ° C. and poured into the gap, silver braze, brass braze, phosphor copper braze, gold braze, aluminum braze, or the like can be used. In addition, this thermocouple wire 8
b is joined to the copper plate 1 by winding a copper brazing foil around the thermocouple wire 8b and inserting it into the hole 12 formed in the copper plate 1 described above, and then heating the whole to 705 to 980 ° C. to melt the copper brazing foil. You can also do this.

FIG. 4 shows a modification of the continuous casting mold according to the first embodiment of the present invention, in which the thermocouple including the exposed tips 9a and 10a of the thermocouple wires 9 and 10 is shown. A short-circuit portion 14a is formed to cover the entire tip of the pair wire 8b. An insulated thermocouple wire 8b is fitted in a metal sheath 20 and buried in a hole 12 formed in the copper plate 1 and a hole 13 formed in the water-cooling box 2. It has the same configuration as the thermocouple wire 8b shown in FIG. The same components are denoted by the same reference numerals. The metal sheath 20 for fitting the thermocouple wire 8b is formed by rolling and covering a pipe or plate made of a metal such as stainless steel, copper, aluminum, iron, or inconel.

Next, a method for using the continuous casting mold according to the first embodiment of the present invention will be described with reference to FIGS. 1, 2, 3 and 4. FIG. Molten steel 21 is poured from an immersion pipe (not shown) into a mold surrounded by mold long pieces 3a and 3b and mold short pieces 3c and 3d of the continuous casting mold A. The heat of the poured molten steel 21 is transmitted from the coating layer 1 a formed on the surface of the copper plate 1 to the copper plate 1, and is removed and cooled by water flowing through the flow path 5 and the flow path 6 formed in the water cooling box 2. The molten steel 21 is cooled as shown by a dotted line in FIG.
It is drawn downward while forming 2 and continuously cast.
Continuous casting after the formation of the solidified shell 22 is performed by interposing a molten powder (not shown) as a lubricant between the solidified shell 22 and the coating layer 1 a formed on the surface of the copper plate 1. The heat from the molten steel 21 and the solidified shell 22 is transferred directly or via a powder (not shown) from the coating layer 1 a provided on the surface of the copper plate 1 on the casting side to the short-circuit portion 14 provided on the surface of the copper plate 1. Heat is transferred. By the heat transfer from the molten steel 21 and the solidified shell 22, an electromotive force is generated at the junction between the thermocouple wire 9 and the thermocouple wire 10 of the thermocouple wire 8b provided on the mold long piece 3a.
The electromotive force generated at the junction is converted into a temperature and displayed on the temperature indicator 18. Here, the temperature of the molten steel 21 and the solidified shell 22 is substantially equal to the surface temperature of the coating layer 1 a formed on the surface of the copper plate 1, and thus occurs at the junction between the thermocouple wires 9 and the thermocouple wires 10. The converted temperature of the electromotive force is also displayed at substantially the same temperature. By measuring the casting process of the molten steel 21 over time, the case where the solidified shell 22 is thin or the solidified shell 2
2 can reliably detect the breakout phenomenon.

The thermocouple wire 8b is connected to the non-conductive insulator 1
1, the leakage is prevented, and a large electromotive force is obtained by directly measuring the high temperature region at the short-circuit portion 14, and the large electromotive force can accurately determine the phenomenon of the coating layer 1a. Further, since the thermocouple wire 8b is integrally fixed to the hole 12 formed in the copper plate 1 with the brazing material 15, it is possible to prevent measurement errors due to flooding or dropping of the thermocouple wire 8b. In particular, the surface of the copper plate 1 or the coating layer 1a becomes unusable because it is worn or its surface is shaved by being used for casting. Here, the surface of the copper plate 1 including the coating layer 1a is ground, and the thermocouple wires 9 and 10 of the thermocouple wire 8b are again formed.
By exposing the tip portions 9a and 10a again to form a short-circuit portion 14 and applying a coating layer 1a covering the short-circuit portion 14,
The copper plate 1 and the thermocouple wire 8b can be used repeatedly.

FIG. 4, which is a modification of the first embodiment of the present invention, shows all the distal ends of the thermocouple wire 8b (the distal end portions 9a and 10a of the thermocouple wires 9 and 10). include)
Is formed, so that the short-circuit portion 14a is formed.
a can be prevented more reliably. Further, since the insulated thermocouple wire 8b is fitted in the metal sheath 20, the strength of the thermocouple wire 8b can be increased, so that the thermocouple wire 8b can be bent and the thermocouple wire 8b can be bent. 8b can be prevented, and the temperature of the surface of the copper
8 enables accurate long-term measurement.

Next, a continuous casting mold according to a second embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. The structure of the continuous casting mold A described in the first embodiment of the present invention, the thermocouple wires 8a to 8h, and the thermocouple wire 8 provided thereunder.
Regarding a ', 8a "to 8h', 8h", the same components are denoted by the same reference numerals. Here, the thermocouple wire 8b will be described as a representative. In the copper plate 1 of the mold long piece 3a, a thermocouple wire 9b composed of a single thermocouple wire 9 whose tip is exposed in a hole 12 formed in the copper plate 1 and whose surface is covered with an insulator 11 is embedded. . The exposed end portion 9a of the thermocouple wire 9 of the thermocouple wire 8b and the surface of the copper plate 1 are joined by a short-circuit portion 14a in which a conductive metal is welded.
A brazing material 15 is poured into a gap between the hole 12 of the copper plate 1 and the insulator 11 of the thermocouple wire 8b and is integrally joined to the copper plate 1. On the other hand, an earth wire 23 is brazed to the copper plate 1, and the earth wire 23 is taken out through an earth wire hole 24 provided in the water-cooling box 2 and connected to the temperature indicator 18. . The ground wire 23, the thermocouple wire 9, and the short-circuit portion 14a
Means that electrical conduction is possible. Reference numeral 25 denotes a seal packing for the ground wire 23 provided in the ground wire hole 24.

A method of using the continuous casting mold according to the second embodiment of the present invention configured as described above will be described with reference to FIGS. 1, 2, and 5A and 5B. The mold long pieces 3a and 3b and the mold short piece 3c of the continuous casting mold A,
Molten steel 21 is poured from a dip tube (not shown) into a mold surrounded by 3d. The heat from the molten steel 21 and the solidified shell 22 is transferred from the coating layer 1a provided on the surface of the copper plate 1 on the casting side to the short-circuit portion 14a provided on the surface of the copper plate 1 directly or via a powder (not shown). When heated, an electromotive force is generated at the junction between the thermocouple wire 9 of the thermocouple wire 8b provided on the mold long piece 3a and the short-circuit portion 14a. This electromotive force is displayed on a temperature indicator 18 provided with a temperature converter. The temperature of the coating layer 1a is substantially the same as the temperature of the molten steel 21 and the solidified shell 22. By measuring the casting of the molten steel 21 over time,
When the solidified shell 22 is thin, or a phenomenon such as breakout can be grasped by an increase in temperature.

The thermocouple wire 8b is connected to the non-conductive insulator 1
1, the leakage can be prevented, and the high temperature region on the surface of the copper plate 1 can be directly measured, so that the electromotive force can be measured as a large value. At the same time, the thermocouple wire 8b
5, it is integrally fixed to the hole 12 formed in the copper plate 1, so that it is possible to prevent errors in measurement due to flooding or dropping of the thermocouple wire 8b. Further, the thermocouple wire 8b is one thermocouple wire 9 and the other thermocouple wire is made of the ground wire 23 connected to the copper plate 1, so that the diameter of the thermocouple wire 8b to the copper plate 1 is reduced. It is possible to increase the number of buried. In particular, since the surface of the copper plate 1 or the coating layer 1a is worn or scraped by casting, the surfaces of the coating layer 1a and the copper plate 1 are ground to smooth the surface of the copper plate 1, After forming the short-circuit portion 14a at the tip 9a of the wire 9,
By forming the coating layer 1a on the surface of the copper plate 1, it can be reused.

FIG. 5B shows a modification of the continuous casting mold according to the second embodiment of the present invention, in which a thermocouple wire 8b is fitted in a metal sheath 20 and a copper plate is provided. It is inserted into the hole 12 drilled in 1. The thermocouple wire 8 b is fixed to the copper plate 1 by pouring a brazing material 15 into a gap between the hole 12 formed in the copper plate 1 and the metal sheath 20. The exposed end portion 9a of the thermocouple wire 9 of the thermocouple wire 8b and the copper plate 1 form a short-circuit portion 14a to enable electrical conduction. In addition. Except for the configuration described above, the thermocouple wire 8b shown in FIG.
It has the same configuration as.

Further, a method of using a modified example of the continuous casting mold according to the second embodiment of the present invention will be described. Heat from the molten steel 21 and the solidified shell 22 poured into the casting mold A for continuous casting is transferred from the coating layer 1a to the short-circuit portion 14a provided on the surface of the copper plate 1, and the thermocouple element wire of the thermocouple wire 8b An electromotive force is generated at the junction between the short-circuit portion 9 and the short-circuit portion 14a. This electromotive force is converted into a temperature and displayed on the temperature indicator 18. The temperature of the coating layer 1a is substantially the same as the temperature of the molten steel 21 and the solidified shell 22. By measuring this surface temperature over time, it is possible to detect phenomena such as the case where the solidified shell 22 is thin or the occurrence of breakout. Further, since one thermocouple element wire 9 and the metal sheath 20 are combined, the thermocouple wire 8b
Of the thermocouple wire 8b can be prevented and the bending process can be performed, and the mounting can be easily performed.

Next, a continuous casting mold according to a third embodiment of the present invention will be described with reference to FIGS. 6, 7, 8 and 9. FIG. The same components as those of the continuous casting mold according to the first and second embodiments of the present invention are denoted by the same reference numerals. A thermocouple unit 26 is integrally joined to the copper plate 1 of the long mold piece 3a of the continuous casting mold A.
The thermocouple wire unit 26 includes thermocouple wires 8b, (8
b ', 8b ") are buried, and the thermocouple wires 8b (8
b ', 8b ") are exposed on the surface of the copper plate 1.
The tip of the thermocouple wire 8b (8b ', 8b ") is joined to the surface of the copper plate 1 by a short-circuit portion 14 made of a conductive metal. Further, the surface of the copper plate 1 and the short-circuit portion 14 are, for example, chromium or chromium alloy. Are covered by a coating layer 1a plated with a thermocouple wire 8b (8).
b ', 8b "), an electric circuit is formed via the short-circuit portion 14. The base end of the thermocouple wire 8b (8b', 8b") has a temperature indicator provided with a temperature converter for electromotive force. It is connected to a total of 18. The thermocouple wire unit 26 is composed of a copper column 27a and a copper column 27b divided into two, and semicircular holes 28a and 28b provided in the copper column 27a and the copper column 27b.
The thermocouple wire 8b (8b ', 8b ") is embedded in the mating surface of the thermocouple wire. The thermocouple wire 8b (8b', 8b") embedded in the thermocouple wire unit 26 has semicircular holes 28a and 28b. The brazing material 15 is poured into the gap between the mating surface and the copper column piece 2.
7a and the copper column piece 27b are integrally fixed. The thermocouple wire unit 26 includes a copper pillar 27a and a peripheral edge 29 of the copper pillar 27b.
By pig welding or copper brazing to form an integral thermocouple unit 26. This thermocouple wire unit 26 is previously placed on a copper plate 1 having a concave portion having the outer dimensions of the thermocouple wire unit 26.
And the edges are similarly fixed by pig welding or copper brazing. Further, as shown in FIG. 9, the thermocouple wire unit 26 has a triangular copper column piece 30a and a copper column piece 30b which are divided into two, or the triangular copper column piece 30a and the copper column piece 30b. Instead, a semi-cylindrical piece (not shown) may be used. Preferably, at least two or more thermocouple wire units 26 are embedded in the copper plate 1 so that a wide range of temperatures on the casting side surface of the copper plate 1 can be measured.

A method of using the continuous casting mold according to the third embodiment of the present invention configured as described above will be described with reference to FIGS. 6, 7, 8, and 9. Molten steel 21,
The heat from the solidified shell 22 is transferred from the coating layer 1a provided on the surface of the copper plate 1 on the casting side to the short-circuit portion 14 provided on the surface of the copper plate 1, and the thermocouple wire 8b ( 8b ',
8b ″), an electromotive force is generated at the junction between the thermocouple wire 9 and the thermocouple wire 10. This electromotive force is converted into a temperature and displayed on the temperature indicator 18. Here, the molten steel 21 and the solidified shell Since the temperature of 22 is approximately the surface temperature of the coating layer 1a formed on the surface of the copper plate 1, the temperature obtained by converting the electromotive force of a large value generated at the junction between the thermocouple wires 9 and 10 is converted. By measuring the casting of the molten steel 21 over time, the solidified shell 22 may be thin due to an increase in temperature, or the solidified shell 22 may be displayed.
The phenomenon of the occurrence of a breakout due to the breakage of the vehicle can be reliably detected.

Since the thermocouple wires 9 and 10 of the thermocouple wire 8b are covered with a non-conductive insulator 11,
Electric leakage can be prevented, and a large electromotive force can be accurately measured by directly measuring the high temperature region of the short-circuit portion 14 at the tip. Furthermore,
A semi-circular hole 28a and a semi-circular hole 2 in which a thermocouple wire 8b is formed in the copper plate 1
Since the brazing material 15 is integrally fixed to the mating portion of the thermocouple wire 8b, it is possible to prevent a measurement error due to flooding or dropping of the thermocouple wire 8b. In particular, since the surface of the copper plate 1 or the coating layer 1a provided on the surface of the copper plate 1 is subject to abrasion and shaving by casting, when reused, the surface of the copper plate 1 including the coating layer 1a is ground. To expose the thermocouple wire 9 of the thermocouple wire 8b and the tip portions 9a and 10a of the thermocouple wire 10 again to form a short-circuit portion 14, and apply a coating layer 1a covering the short-circuit portion 14. . Thereby, the copper plate 1 and the thermocouple wire 8b
Can be used repeatedly to measure the temperature.

Although the continuous casting mold according to the embodiment of the present invention has been described, the thermocouple wire embedded in the copper plate 1 is shown in FIG. 3 or FIG. 4, FIG.
Any of the configurations described in (B) or a combination thereof may be used, and the thermocouple wires may be buried in three or more stages or in a staggered manner, and the number of buried thermocouple wires is large. It can be composed of books. In addition, thermocouple wires 8a to 8h, 8a 'to
8h ', 8a "to 8h" were buried, but the short piece 3
c and 3d, and includes a range that does not deviate from the gist of the present invention.

[0029]

The continuous casting mold according to claims 1 to 5,
A coating layer is provided on the surface of the copper plate on the casting side, and in a continuous casting mold having a water cooling box on the opposite casting side, the tip of the insulated thermocouple wire is exposed and embedded in the copper plate on the casting side. However, since the tip is short-circuited with a conductive metal, it can be measured on the copper plate surface that most closely approximates the level of the molten steel surface and the formation and breakout of the solidified shell, and the phenomenon can be accurately detected as a temperature change. Since overflow or breakout of molten steel can be predicted from the temperature measurement of the copper plate surface, casting accidents and deterioration in quality can be prevented in advance by controlling the casting amount or adjusting the casting speed early. In addition, the surface of the copper plate which has been worn or shaved by casting is ground, and the reuse can be easily performed by short-circuiting the tip of the thermocouple wire exposed again and forming the coating layer.

[0030] In particular, the continuous casting mold according to claim 2 is
Insert an insulated thermocouple wire into the hole drilled in the copper plate,
In addition, since the insulated thermocouple wire and the copper plate are joined by brazing material, water infiltration at the tip of the thermocouple wire is prevented, the mounting strength of the thermocouple wire is improved, and the temperature measurement accuracy of the copper plate surface is improved. And it is possible to prevent measurement failure due to breakage of the thermocouple wire or the like.

The continuous casting mold according to claim 3 is
Since the thermocouple wire is fitted in the metal sheath, the overall strength of the thermocouple wire can be improved by the metal sheath, and the thermocouple wire can be attached to a copper plate with bendability. Since the strength can be improved, measurement failure due to breakage of the thermocouple wire or the like can be reliably prevented.

In the continuous casting mold according to the present invention, since one thermocouple wire of the thermocouple wire is a ground wire connected to the copper plate of the mold, the wire diameter of the thermocouple wire can be reduced, and The number of thermocouple wires embedded in the copper plate can be increased, and the strength of the copper plate can be prevented from lowering due to the embedding of the thermocouple wires. Further, by embedding the thermocouple wire in the copper plate, the level of the molten steel surface, the formation of a solidified shell, breakout, and the like can be detected more accurately.

According to a fifth aspect of the present invention, there is provided a continuous casting mold for forming a thermocouple wire unit by embedding a thermocouple wire in a mating surface of two divided copper column pieces, and forming a thermocouple wire unit on the casting side of the molten steel. Since the thermocouple wire unit is integrally embedded in the surface, a large number of thermocouple wires can be easily attached by preparing the thermocouple wire unit in advance and fitting the thermocouple wire unit on the surface of the copper plate. In addition, there is no problem of an error in the measurement temperature due to the infiltration of the thermocouple wire fixed to the copper plate, and there is no problem of water leakage at the thermocouple wire attachment portion, and the measurement accuracy can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing an entire continuous casting mold according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line BB in FIG.

FIG. 3 is a partially enlarged view of an embedded portion of a thermocouple wire in FIG. 2;

FIG. 4 is a partially enlarged view of an embedded portion of the thermocouple wire when the thermocouple wire is fitted in a metal sheath.

FIG. 5A is a partially enlarged view of a buried portion of a thermocouple wire of a continuous casting mold according to a second embodiment of the present invention.
(B) is a partial enlarged view of a buried portion of the thermocouple wire when the thermocouple wire is fitted in a metal sheath.

FIG. 6 is an overall perspective view of a continuous casting mold according to a third embodiment of the present invention in which a thermocouple unit is embedded in a surface of a copper plate on a casting side.

FIG. 7 is a partially enlarged view of a buried portion of the thermocouple wire.

FIG. 8 is an overall perspective view of the thermocouple unit.

FIG. 9 is an overall perspective view when the thermocouple unit is constituted by triangular prism pieces.

[Explanation of symbols]

A Continuous casting mold 1 Copper plate 1a Coating layer 2 Water cooling box 3a Mold long piece 3b Mold long piece 3c Mold short piece 3d Mold short piece 4 Cooling water supply pipe 5 Cooling water flow path 6 Cooling water flow path 7 Outlet 8a Thermocouple Wire 8b Thermocouple wire 8c Thermocouple wire 8d Thermocouple wire 8e Thermocouple wire 8f Thermocouple wire 8g Thermocouple wire 8h Thermocouple wire 8b 'Thermocouple wire 8b "Thermocouple wire 8f' Thermocouple wire 8f" Thermocouple wire 9 Thermocouple wire 10 Thermocouple wire 9a Tip 10a Tip 11 Insulator 11a Insulating layer 12,13 Hole 14,14a
Short-circuit part 15 Brazing material 16 O-ring 17 Flange 18 Temperature indicator 19 Taper hole 20 Metal sheath 21 Molten steel 22 Solidified shell 23 Earth wire 24 Earth wire hole 25 Seal packing 26 Thermocouple wire unit 27a Copper column piece 27b Copper column piece 28a Half Circular hole 28b Semicircular hole 29 Peripheral edge 30a Triangular copper column piece 30b Triangular copper column piece

Claims (5)

[Claims] 1. A continuous casting mold provided with a coating layer on a surface of a copper plate on the casting side and a water cooling box on a side opposite to the casting side of the copper plate, wherein a thermocouple wire insulated in the copper plate on the casting side is provided. Wherein the exposed end of the thermocouple wire is exposed on the surface of the copper plate, and the end of the thermocouple wire is short-circuited with a conductive metal. 2. The continuous casting mold according to claim 1, wherein the insulated thermocouple wire is joined to the copper plate with a brazing material. 3. The continuous casting mold according to claim 1, wherein the insulated thermocouple wire is fitted in a metal sheath. 4. The continuous casting mold according to claim 1, wherein one of the thermocouple wires is a ground wire connected to the copper plate. . 5. The continuity according to claim 1, wherein the thermocouple wire is a thermocouple wire unit embedded in a mating surface of two divided copper pillar pieces. Casting mold.