JP5789540B2 - Heating device, continuous casting device and continuous casting method - Google Patents

Description

  The present invention relates to a heating device used in a continuous casting apparatus for continuously casting a casting made of magnesium or a magnesium alloy (hereinafter collectively referred to as “magnesium alloy”), and a continuous casting apparatus using the same. And a continuous casting method.

  Conventionally, in a magnesium alloy continuous casting apparatus, molten magnesium alloy is supplied from a holding furnace to a continuous casting mold via a tundish and solidified through primary cooling by a continuous casting mold and secondary cooling by direct water cooling. Then, the casting is formed in the extending direction of the continuous casting mold. The continuous casting apparatus can be generally classified into a vertical (vertical) continuous casting apparatus and a horizontal (horizontal) continuous casting apparatus.

  Moreover, the tundish used for the continuous casting apparatus of a magnesium alloy incorporates an electric heater in the bottom wall and the side wall in order to maintain the temperature of the molten metal to be stored, as disclosed in Patent Document 1 below.

  By the way, regarding the cleaning of tundish that stores molten magnesium alloy, when casting different types of alloys, magnesium alloy adhered to the inner peripheral surface of the tundish by washing so that the alloy components used last time do not remain Need to be cleaned.

Japanese Patent No. 3668245

However, according to the conventional tundish, since the electric heater is incorporated, it is necessary to wash the electric heater and the electric wiring so that the electric heater and the electric wiring do not get wet with water, which is very inconvenient.
Further, since the electric heater is built in, the tundish becomes heavy, and it is difficult to move the tundish to the washing place in order to wash it with water.

  Therefore, the present invention was devised in view of the above problems, and is a heating device that heats a tundish used in a continuous casting apparatus for magnesium alloy and is separable and easy to handle at the time of washing with water. It is an object to provide a continuous casting apparatus and a continuous casting method provided with a heating device.

In order to solve the above problems, a heating apparatus according to claim 1 is a heating apparatus for heating a tundish used in a continuous casting apparatus for continuously casting a molten magnesium alloy, wherein the heating apparatus includes the tank. the side of the dish and is disposed below, has a wall portion that faces the side surface and bottom surface of the tundish, is supported by the wall portion, and an electric heater opposite the side and bottom surfaces of the tundish, the The tundish and the wall portion are separable laterally .

According to the heating device of the first aspect, the side surface and the bottom surface of the tundish can be heated, and the temperature of the molten metal stored in the tundish can be maintained. Therefore, a tundish that does not incorporate an electric heater on the side or bottom can be used.
In addition, the wall of the heating device that supports the electric heater and the tundish can be separated to the side. When washing the tundish with water, the tundish is separated from the heating device and only the tundish is washed with water. It becomes possible.

Further, the wall portion of the heating device according to claim 2 has a groove portion on a surface facing a side surface and a bottom surface of the tundish, and the electric heater is provided in the groove portion. .

  According to the heating device of the second aspect, since the electric heater is provided in the groove portion of the wall portion, the tundish and the electric heater do not come into contact with each other when attached to the tundish.

  Further, the continuous casting apparatus according to claim 3, a continuous casting mold, a tundish for storing a molten magnesium alloy, and sending a casting through the continuous casting mold installed on the lower side; 3. A continuous casting apparatus comprising: a drawing device that continuously pulls out a casting cast by the continuous casting mold, wherein the molten metal stored in the tundish is heated. And a heating device controller that controls the heating temperature of the heating device so that the molten metal stored in the tundish has a set temperature.

  According to the continuous casting apparatus of the third aspect, since the heating apparatus capable of heating the side surface and the bottom surface of the tundish and maintaining the temperature of the molten metal stored in the tundish is provided, Dish can be used. Further, the tundish and the heating device can be separated, and the tundish can be separated from the heating device, and only the tundish can be washed with water.

In addition, the heating device controller of the continuous casting apparatus according to claim 4 measures the temperature of the molten metal stored in the tundish, and outputs the molten metal temperature measurement information to the tundish. A storage unit that stores molten metal set temperature information that is a set temperature of the molten metal that is stored, and whether the molten metal measured temperature of the molten metal measured temperature information is the molten metal set temperature of the molten metal set temperature information stored in the storage unit And monitoring the output of the monitoring result, and heating the electric heater device so that the molten metal set temperature information of the molten metal set temperature information stored in the storage unit is based on the monitoring result And a setting unit for setting the temperature.
The continuous casting method according to claim 5 is a continuous casting method for producing a magnesium alloy casting using the continuous casting apparatus according to claim 4, wherein the molten metal temperature measuring unit is used to perform the tanning process. The temperature of the molten metal stored in the dish is measured, the monitoring unit monitors whether or not the molten metal measurement temperature is the molten metal set temperature stored in the storage unit, and the monitoring unit is configured to monitor the molten metal. On the basis of the monitoring result, the heating temperature of the electric heater device is set to be the molten metal set temperature of the molten metal set temperature information stored in the storage unit.

  According to the continuous casting apparatus according to claim 4 and the continuous casting method according to claim 5, the temperature of the molten metal is monitored by the monitoring unit, and the setting unit determines the heating temperature of the electric heater based on the monitoring result. It is set. Therefore, the molten metal stored in the tundish can be maintained at the set temperature.

The heating device, continuous casting device, and continuous casting method according to the present invention have the following excellent effects.
The heating device according to claim 1 is configured to heat and separate the tundish used in the continuous casting device for magnesium alloy from the outside. Therefore, when washing the tundish with water, it is not necessary to take care to prevent the wiring from getting wet with water, and it is easy to move to the washing place, improving the cleanability. Is easy to handle.

  In addition, since the heating device according to claim 2 is free from contact between the tundish and the electric heater when the tundish is attached, the electric heater can be prevented from being damaged, easy to handle, and the life of the electric heater can be maintained. Can be lengthened.

  Moreover, since the continuous casting apparatus which concerns on Claim 3 heats the tundish used for the continuous casting apparatus for magnesium alloys from the outside, and is a structure which can be isolate | separated, the handling at the time of the water washing of a tundish is easy It becomes. In addition, since the molten metal stored in the tundish is maintained so as to be within the set temperature range, a high-quality casting can be manufactured.

  Further, in the continuous casting apparatus according to claim 4 and the continuous casting method according to claim 5, since the molten metal stored in the tundish is maintained within the set temperature range by the heating device control unit, A good casting can be produced.

It is the perspective view which looked at the continuous casting apparatus which concerns on embodiment of this invention from the upper right side of the front side. It is a block diagram which shows the structure of the heating apparatus control part which comprises the continuous casting apparatus which concerns on embodiment of this invention. It is the disassembled perspective view which decomposed | disassembled the tundish and heating apparatus which the continuous casting apparatus shown by FIG. 1 comprises. It is the perspective view which looked at the tundish concerning the embodiment of the present invention from the right upper part on the back side. It is the rear view which looked at the tundish concerning the embodiment of the present invention from the back. It is the expansion perspective view which expanded the heating apparatus illustrated by FIG. It is the top view which looked at the heating apparatus concerning the embodiment of the present invention from the upper part.

  A continuous casting apparatus according to an embodiment of the present invention will be described with reference to the drawings. In the description of the embodiments, the same elements are denoted by the same reference numerals.

(Continuous casting device 1)
As shown in FIG. 1, the continuous casting apparatus 1 continuously casts a molten magnesium alloy (hereinafter referred to as “molten metal”) supplied from a holding furnace (not shown) via a molten metal supply pipe 2. A magnesium alloy casting W is manufactured.

1 to 3, the continuous casting apparatus 1 includes a tundish 3 for storing molten metal, a continuous casting mold 4 for casting molten metal, a cooling device (not shown) for cooling the molten metal, and cast magnesium. A drawing device 5 for drawing the alloy casting W in the horizontal direction (arrow A direction shown in FIG. 1), a heating device 6 for heating the tundish 3, and a heating device control unit 50 for controlling the heating device 6. I have.
In the following description, with reference to the continuous casting apparatus 1, the direction indicated by the arrow A shown in FIG. 1 is referred to as the front side, and the opposite direction side is referred to as the rear side. Moreover, about the left-right direction, it demonstrates as the right side and the left side on the basis of the case where the continuous casting apparatus 1 is seen from the front side.

(Tundish 3)
As shown in FIG. 3, the tundish 3 has a housing 7 that has an opening 8 in the upper portion and stores molten metal, a lid plate 16 (see FIG. 1) that closes the opening 8, and a front surface of the housing 7. A mold mounting plate (not shown) for mounting the casting mold 4 and a plug member 40 are provided.
It has.

  As shown in FIGS. 4 and 5, the housing 7 has an internal space 7 a for storing the molten metal, and stores the molten metal supplied from the molten metal supply pipe 2. Moreover, as shown in FIGS. 3-5, the molten metal supply port 30 (refer especially FIG. 3) which flows a molten metal into the casting_mold | template 4 for continuous casting attached to the casting_mold | template mounting plate which is not shown in the housing | casing 7 and the molten metal are shown. A discharge port 11 for discharging, a bottom wall accommodating portion 15 for accommodating a bottom wall portion 24 (see FIG. 6) of the heating device 6 described later, and a plug member fixing portion 11b for fixing the plug member 40 are formed. .

  As shown in FIG. 3, the molten metal supply port 30 is a hole that penetrates the lower part of the front surface of the housing 7. Through the molten metal supply port 30, the molten metal stored in the internal space 7 a is supplied to the continuous casting mold 4.

The discharge port 11 penetrates the lower part of the right side surface of the casing 7 and is a hole for discharging the molten metal stored in the internal space 7a of the casing 7 after the completion of casting.
Further, as shown in FIG. 5, the discharge port 11 is sealed by inserting the plug portion 41 of the plug member 40 at the time of casting. In addition, the bottom face 9 which comprises the housing 7 inclines toward the discharge port 11 side so that the stored molten metal may be discharged easily, as shown in FIG.
As shown in FIG. 4, the plug member fixing portion 11 b is a portion that extends in the right direction from the right side surface of the housing 7 in a substantially U shape that opens upward when viewed from the side surface.
The stopper member fixing portion 11b has substantially V-shaped cutouts 11c and 11c as viewed from the front and rear. And the stopper 43 of the stopper member 40 is latched by the notch 11c, and the stopper member 40 is being fixed.

  4 and 5, the bottom wall portion accommodating portion 15 is a hole formed from the back surface of the housing 7 toward the front side, and is a bottom wall portion 24 of the heating device 6 described later (see FIG. 6). ).

  As shown in FIG. 1, the mold attachment plate (not shown) is a component for attaching the continuous casting mold 4 to the front side of the housing 7.

As shown in FIG. 3, the plug member 40 includes a cylindrical plug portion 41 that seals the discharge port 11, and a grip portion 42 that extends from the rear end of the plug portion 41. The grip part 42 is a part for pulling out the plug part 41 inserted into the discharge port 11.
Further, as shown in FIG. 5, the gripping portion 42 has a stopper 43 that extends in the horizontal direction and engages with the notch 11c of the plug member fixing portion 11b.

  As shown in FIGS. 1 and 3, the cover plate 16 is a member that closes the opening 8, and prevents the molten metal stored in the internal space 7 a from touching the outside air and oxidizing.

(Continuous casting mold 4)
As shown in FIG. 1, the continuous casting mold 4 is a part that is attached to a mold mounting plate (not shown) of the tundish 3 and casts molten metal flowing from the tundish 3. Further, the continuous casting mold 4 is formed with a flow path (not shown) for allowing the cooling medium injected from the cooling medium (not shown) to enter the continuous casting mold 4.

(Cooling system)
The cooling device (not shown) is a device for supplying a cooling medium such as water and cooling gas to a flow path (not shown) formed in the continuous casting mold 4.

(Drawer 5)
As shown in FIG. 1, the drawing device 5 is a device including a rotating columnar member, and pulls a casting W placed on the rotating columnar member in the horizontal direction.

(Heating device 6)
As shown in FIG. 1, the heating device 6 is a device that heats the tundish 3 adjacent to the tundish 3. As shown in FIG. 6, the heating device 6 includes a sheath heater 20, a wall portion 21 that supports the sheath heater 20, and a cover member 22 that covers the outer surface of the wall portion 21.

  The sheath heater 20 is an electric heater that is provided with a spiral heating element inside a metal hollow pipe and is filled with an insulator having good thermal conductivity, and is stored in a heater storage section 26 described later. . In addition, in this embodiment, although demonstrated using the sheath heater 20 as a structure for heating, this invention is not limited to this sheath heater 20, A heating wire etc. may be sufficient.

  The wall portion 21 is for supporting the sheath heater 20 and is preferably formed of a heat insulating material. As shown in FIGS. 6 and 7, the wall portion 21 includes a substantially U-shaped side wall portion 23 in a plan view and a bottom wall portion 24 formed on the lower side of the side wall portion 23.

  As shown in FIGS. 6 and 7, the side wall portion 23 has a tundish storage portion 25 that is a space in which the tundish 3 can be stored. And the side wall part 23 accommodates the tundish 3 in the tundish accommodating part 25, and is arrange | positioned facing the side surface of the tundish 3. FIG.

  As shown in FIGS. 6 and 7, the bottom wall portion 24 is a portion that extends into the tundish storage portion 25 from the lower side of the side wall portion 23. Further, the bottom wall portion 24 is accommodated in the bottom wall portion accommodating portion 15 of the tundish 3 accommodated in the tundish accommodating portion 25 and is disposed to face the bottom surface 9.

  Further, the side wall 23 and the bottom wall 24 are formed with a heater housing portion 26 for housing the sheath heater 20 on the inner peripheral surface side, that is, on the surface opposed to the side surface and the bottom surface 9 of the tundish 3. The sheath heater 20 is stored. In addition, the heater storage portion 26 has a depth at which the stored sheath heater 20 does not protrude from the inner peripheral surface.

  In addition, as shown in FIG. 6, a discharge port accommodating portion 27 that is a space for accommodating the discharge port 11 and the like of the tundish 3 is formed at the lower right side of the side wall portion 23.

  As shown in FIGS. 6 and 7, the cover member 22 is a metal member that covers the outer peripheral surfaces of the side wall portion 23 and the bottom wall portion 24 in order to prevent heat dissipation.

(Heating device controller 50)
As shown in FIG. 2, the heating device control unit 50 is configured to control the heating temperature of the sheath heater 20 provided in the heating device 6, and includes a molten metal temperature measuring unit (not shown), a heater heating measuring unit (not shown), A storage unit 52, a monitoring unit 51, and a setting unit 53.

The molten metal temperature measuring unit (not shown) is a device that measures the temperature of the molten metal stored in the tundish 3 and outputs the measured molten metal temperature information to the monitoring unit 51, such as a laser measuring instrument.
The electric heater heating measurement unit (not shown) is a device that measures the heating temperature of the sheath heater 20, such as a thermocouple, and outputs the measured electric heater measurement temperature information to the setting unit 53.

The storage unit 52 stores melt set temperature information that is a set temperature of the melt stored in the tundish 3.
The monitoring unit 51 monitors whether or not the melt measurement temperature in the melt measurement temperature information output from the melt temperature measurement unit (not shown) is the melt set temperature in the melt set temperature information stored in the storage unit 52, The monitoring result is output to the setting unit 53.
The setting unit 53 sets the heating temperature of the sheath heater 20 based on the monitoring result output from the monitoring unit 51 so that the molten metal set temperature is stored in the storage unit 52.
The setting unit 53 feeds back heater measurement temperature information output from a heater heating measurement unit (not shown) to appropriately adjust the heating temperature of the sheath heater 20 to avoid damage to the tundish 3 due to overheating of the sheath heater 20. doing.

Next, the usage method of the continuous casting apparatus 1 which concerns on embodiment is demonstrated easily.
As shown in FIGS. 1 and 3, the molten metal supplied through the molten metal supply pipe 2 flows into the internal space 7 a of the tundish 3 and is stored. Then, the molten metal flows out into the continuous casting mold 4 through the molten metal supply port 30 of the tundish 3.

  In addition to the molten metal flowing from the tundish 3 into the continuous casting mold 4, the molten metal is supplied from a cooling device (not shown) through a flow path (not shown) formed in the continuous casting mold 4. The cooling medium enters, the molten metal is cooled in the continuous casting mold 4, and the casting W is manufactured.

  In addition, since the continuous casting mold 4 and the internal space 7a of the tundish 3 are continuous, the pressure of the molten metal stored in the internal space 7a acts on the casting W in the continuous casting mold 4, and the continuous casting. The casting W in the casting mold 4 is extruded.

  The casting W cast in the continuous casting mold 4 is hardened so as to be continuous with the rear end of the casting W already drawn from the drawing device 5 and drawn out from the continuous casting mold 4. Then, after the casting W is drawn out from the continuous casting mold 4, the molten metal stored in the tundish 3 further flows into the continuous casting mold 4 and is continuously cast to form a series of castings W. Is manufactured.

  Further, in the present embodiment, the temperature of the molten metal in the tundish 3 is constantly measured by a molten metal temperature measuring unit (not shown), and monitoring is performed by the monitoring unit 51 (see FIG. 2) to determine whether it is within the molten metal set temperature range. Has been. Therefore, even if the molten metal is out of the range of the molten metal set temperature, the setting unit 53 controls the heating temperature of the sheath heater 20 of the heating device 6, so that the set temperature is always stored in the storage unit 52. Maintained.

In addition, as shown in FIG. 4, the heating device 6 is attached to the tundish 3 by moving the back side of the tundish 3 toward the tundish storage portion 25 of the heating device 6. Housed inside.
With the above attachment, the sheath heater 20 supported by the side wall portion 23 of the heating device 6 can be heated to face the side surface of the tundish 3. Further, the sheath heater 20 supported by the bottom wall portion 24 of the heating device 6 can be heated to face the bottom surface 9 of the tundish 3.

  As mentioned above, although the structure and usage method of the continuous casting apparatus 1 which concerns on embodiment were demonstrated, since the continuous casting apparatus 1 which concerns on embodiment can heat the side surface and bottom face 9 of the tundish 3 with the heating apparatus 6, It becomes possible to maintain the temperature of the molten metal stored in the tundish 3.

Moreover, according to the continuous casting apparatus 1 which concerns on embodiment, since the heating apparatus 6 which heats the tundish 3 is provided, the tundish 3 which does not incorporate an electric heater can be used.
Further, since the tundish 3 can be separated from the heating device 6, when the tundish 3 is washed with water, the tundish 3 can be separated from the heating device 6 and only the tundish 3 can be washed with water.
Therefore, the tundish 3 does not have to be considered so that the electric heater and the electric wiring do not get wet with water, and the tundish 3 can be easily moved to the washing place and can be improved in cleanability.

Moreover, according to the wall part 21 which supports the sheath heater 20 of embodiment, since it forms with the heat insulating material, the heating by the sheath heater 20 can be suppressed and the improvement of safety can be aimed at.
Furthermore, according to the heater storage portion 26 of the embodiment, since the sheath heater 20 is held so as not to contact the tundish 3, it is possible to avoid a situation in which the tundish 3 is contacted and damaged when the tundish 3 is attached. Moreover, since the wall 21 of the embodiment includes the cover member 22 on the outer surface side, the heat of the sheath heater 20 is difficult to escape.

As mentioned above, although the continuous casting apparatus 1 which concerns on embodiment was demonstrated, this invention is not restricted to the structure of the continuous casting apparatus 1 of embodiment. For example, in addition to the heating device 6 of the embodiment, a flat plate heating device may be further provided so as to face the front side of the tundish 3 so that the front surface of the tundish 3 is heated.
In addition, although embodiment demonstrates using the horizontal type (horizontal type) continuous casting apparatus 1 cast in a horizontal direction, this invention is not limited to this, The vertical type (vertical type) cast in a vertical direction The invention is applicable even to a continuous casting apparatus.

DESCRIPTION OF SYMBOLS 1 Continuous casting apparatus 3 Tundish 4 Continuous casting mold 5 Drawing apparatus 6 Heating apparatus 7 Internal space 20 Sheath heater 21 Wall part 22 Cover member 50 Heating apparatus control part

Claims (5)

A heating device for heating a tundish used in a continuous casting apparatus for continuously casting a molten magnesium alloy,
The heating device is
A wall portion disposed on a side and a lower side of the tundish and facing a side surface and a bottom surface of the tundish;
An electric heater supported by the wall and facing the side and bottom surfaces of the tundish;
The heating apparatus, wherein the tundish and the wall portion are separable laterally . The wall portion has a groove on a surface facing the side surface and the bottom surface of the tundish,
The heating apparatus according to claim 1, wherein the electric heater is provided in the groove. A casting mold for continuous casting;
A tundish that stores a molten magnesium alloy and sends out a casting through the continuous casting mold installed on the lower side;
A continuous casting apparatus comprising a drawing device for continuously drawing a casting cast by the continuous casting mold,
The heating device according to claim 1 or 2, wherein the molten metal stored in the tundish is heated.
A continuous casting apparatus, further comprising: a heating device controller that controls a heating temperature of the heating device so that the molten metal stored in the tundish has a set temperature. The heating device controller is
Measuring the temperature of the molten metal stored in the tundish, and outputting a molten metal measurement temperature information;
A storage unit for storing melt set temperature information which is a set temperature of the melt stored in the tundish;
A monitoring unit that monitors whether the molten metal measurement temperature of the molten metal measurement temperature information is the molten metal setting temperature of the molten metal setting temperature information stored in the storage unit, and outputs a monitoring result;
And a setting unit configured to set a heating temperature of the electric heater device so as to be a molten metal set temperature of the molten metal set temperature information stored in the storage unit based on the monitoring result. Item 4. The continuous casting apparatus according to item 3. A continuous casting method for producing a magnesium alloy casting using the continuous casting apparatus according to claim 4,
The molten metal temperature measuring unit measures the temperature of the molten metal stored in the tundish,
The monitoring unit monitors whether the molten metal measurement temperature is the molten metal set temperature stored in the storage unit,
The setting unit sets the heating temperature of the electric heater device to be the molten metal set temperature of the molten metal set temperature information stored in the storage unit based on the monitoring result of the monitoring unit. Continuous casting method.

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