JPS60191640A - Casting method of casting ingot in heated mold type continuous casting method - Google Patents

Abstract

PURPOSE:To draw out surely a casting ingot and to cast continuously the casting ingot in succession thereto by inserting a dummy casting ingot into a casting mold so as to contact a molten metal, bringing the top end part thereof into contact with the molten metal and unitizing homogeneously said part to the melten metal then drawing out the dummy casting ingot. CONSTITUTION:The temp. of at least the inside wall of the outlet of a casting mold 3 contg. a heating element 6 and a thermocouple 6 is held at the temp. above the solidifying temp. of the metal to be cast and a molten metal 2 is supplied into the mold 3 from the inlet end thereof and is brought into contact with the top end of a dummy casting ingot 7 inserted into the mold from the outlet end and is then held for a while in a heated mold type continuous casting device in which the mold 3 is fixed by a fixing mechanism 4 into the molten metal 2 in a holding furnace 1 so as to make the top surface thereof flush with the molten metal surface. The part near the top end of the ingot 7 is thereby melted. The ingot 7 is drawn out by pinch rollers 11 after the homogeneous unification of the molten metal 2 and the top end of the dummy casting ingot to one body is detected from the change in the temp. detected by the thermocouple 6. The solidified shell drawn out with said dummy casting ingot is cooled by a casting ingot cooler 8 by which the casting ingot is surely and continuously cast.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous casting method for metal, which has an outlet for drawing out the ingot and an inlet for the molten metal supply reservoir, and the inner wall temperature is set to the solidification temperature of the metal to be cast. The molten metal is supplied into the casting chamber from the artificial end of the heated mold held above, and the molten metal is brought into contact with the tip of the dummy ingot inserted into the mold from the mold outlet end. This relates to the operation at the start of ingot casting in a continuous gold ingot casting method in which a gold ingot solidified body is continuously formed at the tip of a dummy ingot by drawing it out of the mold outlet.

Conventionally, this continuous casting method for yuzu metal has been proposed in Patent No. 1049146 as a casting method that produces a smooth and beautiful surface, but in order to carry out this method, the timing at the start of ingot casting is extremely high. It was difficult. For example, when performing vertical continuous casting, if you start pulling the dummy ingot immediately after it comes into contact with the molten metal filled in the mold, the dummy ingot The ingot could not be pulled up due to insufficient contact with the molten metal, and the molten metal in the area that came into contact with the dummy ingot solidified and stuck to the iron wall, making it impossible to pull out the ingot. In addition, when performing the vertical downward drawing continuous casting method and the horizontal horizontal drawing continuous casting method, if the timing of pulling out the dummy ingot is incorrect, a breakout may occur, or conversely, the molten metal in the area that came into contact with the dummy ingot may It solidifies and sticks to the wall, making it impossible to pull out the ingot. In particular, even gold ingots such as cast pig iron, which have a solidification temperature of over 1000°C, and gold ingots, such as aluminum, which have a low solidification temperature of around 700°C, the diameter! When trying to cast small round bar ingots of 011011 or less, the timing of withdrawing the ingot is extremely difficult, the success rate at the beginning is extremely low, and it is extremely difficult to use it industrially.

The inventor made a lot of effort and died, but at the start of casting, a dummy ingot was inserted into the mold and brought into contact with the molten metal, and then the tip of the dummy ingot was melted. It has been discovered that the success rate of ingot casting can be dramatically improved when the dummy ingot is pulled out from the @-type outlet after being homogeneously integrated with the molten metal. When the dummy ingot is inserted into the heating mold and comes into contact with the gold striped molten metal, the contact area is affected by heat flow through the dummy ingot.
First, coagulation proceeds. Thereafter, the solidified portion begins to melt due to heat inflow from the surrounding molten metal and heat inflow from the heating element for heating the mold. At this time, if the conditions are such that the heat inflow described in the above two terms is greater than the thermoelectricity flowing out of the mold through the dummy ingot, the entire solidified part will melt, and even the tip of the dummy ingot will melt. Dissolution progresses. If you start pulling out the dummy ingot, the dummy ingot and the molten metal will be in a homogeneous state, so when you start pulling out the ingot, you can adjust the drawing speed without causing separation between the ingot and the dummy ingot. By keeping it at a suitable level, the ingot can be smoothly pulled out from the mold outlet following the dummy ingot, and the casting success rate can be dramatically improved. However, in carrying out this method, it must be acknowledged that the tip of the dummy ingot is excessively melted.

In other words, if there is too little melting at the tip of the dummy ingot, even if the dummy ingot is pulled out, the molten metal may not be drawn out, or some of the molten metal in the mold may remain condensed, causing the dummy ingot and molten metal to separate. There is a gap between the two. On the other hand, if the melting of the tip of the dummy ingot progresses too much, the cross-sectional shape of the ingot will become disordered in the case of vertical top button type continuous casting when the ingot starts to be withdrawn, and it will take a long time to reach a steady state of withdrawal. In the case of continuous ingot casting using the pull or horizontal pull type, a breakout occurs and the ingot cannot be withdrawn.

According to Inventor et al., moderate melting of the tip of the dummy ingot means that the tip of the dummy ingot is melted over 5#11 or more, regardless of the drawing direction of the ingot, and It is desirable that the unmelted portion of the ingot remains in the mold for 5 to 10 days.

Further, in the present invention, the following method is used to determine whether the tip of the dummy ingot is appropriately melted.

That is, the first method is to insert a dummy ingot into the mold and bring it into contact with the finished metal, and then, while keeping the calorific value of the heating element for heating the mold constant, This method detects the temperature near the inner wall and detects that the tip of the dummy ingot has melted appropriately.

In implementing this method, in addition to the metal to be cast, the cross-sectional shape of the ingot, the shape of the dummy ingot, and the shape and material of the mold, the temperature detection position near the inner wall at the end of the mold was considered. In the above, it is necessary to experimentally confirm the lower and upper limits of the temperature near the inner wall of the mold outlet end at which the tip of the dummy ingot melts appropriately and the ingot can be pulled out. The temperature near the inner wall of the mold outlet end drops rapidly after the dummy ingot and the molten metal come into contact with each other, and then rises due to the heat flow of υ into the mold heating heating element and the molten metal. The ingot withdrawal may be started when the detected temperature near the inner wall of the mold reaches a standard value determined empirically between the lower limit value and the upper limit value.

The second method is to control the heating lid of the heating element for heating the mold so that the temperature near the inner wall at the exit end of the mold is constant, and to detect the amount of heat generated by the heating element. In carrying out this method, the temperature near the inner wall of the mold is controlled to be constant, and the heat generated by the heating element for @-type heating is such that the tip of the dummy ingot melts appropriately and the ingot can only be pulled out. The relationship between the upper and lower limit values of the lid should be determined in advance by considering the type of metal to be cast, the cross-sectional shape of the ingot, the shape of the dummy ingot, the shape and material of the mold, and the temperature detection position near the inner wall at the mold outlet end. It is necessary to confirm this experimentally.

After the dummy ingot and the molten gold W4 come into contact, the temperature near the inner wall of the mold decreases, then rises to a predetermined constant temperature. The heat-generating lid of the heat-generating element is first heated, and then gradually lowered. It is sufficient to start withdrawing the @ block when the calorific value of the detected @ type heating element reaches a standard value determined empirically between the above upper limit 111 and lower limit 111. Note that in controlling the calorific value of the heating element for =m heating, an appropriate known control method such as proportional-integral-derivative control may be used. In addition, if this method is used, it is possible to start drawing the ingot when the temperature near the inner wall at the mold outlet end is lower than in the first method, so the operation until the casting speed reaches a constant state is necessary. In addition to this, the negativity of the heating element for heating the mold is reduced, making it possible to extend the life of the mold. However, in this method, compared to the first method, a longer period of time is required between bringing the dummy ingot into contact with the molten metal and starting to draw out the ingot.

The third means is a method of detecting the temperature of the dummy ingot outside the mold to detect that the tip of the dummy ingot has melted appropriately. The Vc for carrying out this method is the temperature at which the tip of the dummy ingot is excessively melted and the ingot can be pulled out.The cross-sectional shape of the ingot, the shape of the dummy ingot, The shape and material of the mold, the calorific value of the mold heating heating element which is becoming constant, the temperature near the inner wall of the mold outlet end which is becoming constant, and the detected dummy ingot temperature position are '4ML.
It is necessary to confirm this experimentally. After the dummy ingot makes easy contact, the detected dummy ingot temperature continues to rise. Ingot withdrawal may be started when the detected dummy ingot temperature reaches the standard 11k defined axially between the above lower limit and upper limit. If this method is used, the melting state of the dummy ingot tip can be detected more accurately than the first and second methods, but on the other hand, it is necessary to install a temperature detection sensor to detect the dummy ingot temperature. becomes. Also,
This temperature detection sensor includes a thermometer, a radiation thermometer, a contact thermometer, etc., but if a thermocouple is used, it may be necessary to remove it after starting to draw the ingot.

The fourth method is to detect whether the tip of the dummy ingot has melted appropriately by detecting the temperature of the molten metal inside the mold.

When implementing this method, the lower and upper limits of the detected temperature of the molten metal in the mold must be set in advance so that the tip of the dummy ingot melts appropriately and the ingot can be pulled out. the cross-sectional shape of the ingot, the shape of the dummy ingot, the shape and material of the mold, the temperature detection position of the self-molten metal in the mold, and the calorific value of the heating element for heating the mold, which is becoming constant, or the mold outlet, which is being controlled to be constant. It is necessary to confirm this experimentally, taking into consideration the temperature near the end inner wall. After bringing the dummy ingot into contact with the bath water,
The temperature of the bath water in the mold drops once and rises again. The withdrawal of the ingot may be started when the detected temperature of the bath water in the mold reaches a standard value determined empirically between the above-mentioned lower limit and upper limit.

Compared to the first method, this method has a shorter response delay because the temperature detection sensor is placed inside the molten metal. At the same time, after the dummy ingot is brought into contact with the molten metal, the molten metal near the tip of the dummy ingot may solidify, damaging the temperature detection sensor.

As mentioned above, in carrying out these methods, the time from bringing the tip of the dummy ingot into contact with the molten metal until the tip can be melted excessively and the ingot can be pulled out is shortened. is desirable. To achieve this, it is sufficient to reduce the heat transfer from the tip of the dummy ingot to the other end.

The first way to prevent this is to use heat insulating material on the dummy ingot except for its tip. In carrying out this method, ingot solidification II immediately after the start of ingot withdrawal! In order to prevent a decrease in the LI speed, it is desirable that the position where the heat insulating material is used is located away from the cooling level of the cake.

The second method is to use the portion of the dummy ingot excluding the tip as a core nitrogen. This method is effective when continuously producing solid rod-shaped ingots. Further, in order to prevent a decrease in the solidification rate of the ingot immediately after the start of ingot withdrawal, it is desirable to use a dummy ingot at a position after the ingot cooling position as a core nitrogen.

The third method is to use a metal with poor heat conductivity for the parts of the dummy ingot except for the tip. This means is preferably used in combination with the second means mentioned above.

The fourth method is to use a material with low emissivity, such as ceramic spraying, on the surface of the dummy ingot, excluding the tip. In the case of metals with a high melting point, this is effective for reducing heat radiation from the dummy ingot's surface. When using this means, it is preferable to use it in combination with the first to third means described above.

The above-mentioned Okaya of the present invention will be more clearly illustrated by the following description of the drawings and examples.

FIG. 1 shows the state at the moment when a dummy ingot is brought into contact with the molten metal to be cast in a top-pull type continuous casting apparatus. In the figure, reference numeral 1 denotes a molten metal holding furnace, in which molten metal 2 is held so that its upper surface is flush with the upper surface of a mold 3 by known means. The mold 3 is fixed by a fixing mechanism 4 and has a built-in heating element 5 and a thermocouple 6 so that the temperature near the inner wall of the mold 3 can be detected. 7
is a dummy ingot, gold! 4 An ingot and ingot cooling device that improves contact with the molten metal 2. Cooling air is introduced through the inlet 9 and discharged through the spout 10. 11 is a pinch roller tear for pulling out ingots.

First, when the dummy ingot 7 is brought into contact with the molten metal 2 in the mold 3, the molten metal in the mold solidifies due to heat flow through the dummy ingot 7, and then flows out from the molten metal 2 and the heating element 5 built into the mold. The dummy ingot 7 is gradually remelted by the inflow of heat, and the tip of the dummy ingot 7 becomes appropriately melted. At this time, at the same time as starting to pull the ingot, start cooling the ingot using the ingot cooling device [8, and appropriately control the ingot drawing speed so that the solidified position of the narrow side of the ingot is at the mold mouth end. If it is just outside,
An ingot with a smooth and beautiful casting surface is obtained.

FIG. 2 is a sectional view showing one aspect of the dummy ingot. In the figure, 12 is the tip of the dummy ingot, and the part 1 after the cooling device
3 is hollow. Both are screwed together.

For example, in continuous casting of 99.99'% aluminum, it is effective to use 99.99% aluminum for the tip portion 12 and use a material with a low heat transfer coefficient such as stainless steel for the portion 13 after the cooling device.

FIG. 3 is a sectional view showing another aspect of the dummy ingot.

In the figure, reference numeral 14 denotes the tip of the dummy ingot, which is connected to a portion 15 after the cooling device with a screw 17 via a heat insulating ring 16.

Next, embodiments according to the present invention will be described.

Example 1 In this example, vertical top-pass continuous casting was performed using a heating mold.
This figure shows a case where a 9.99% aluminum Ik & 20 ays round bar is cast according to the present invention.

The mold used was silicon carbide with an inner diameter of 20 mm, an outer diameter of 40 mm, and a height of 40 mm. A nickel-chrome wire was attached around the mold to serve as a heating element for heating the mold. An alumel-chromel thermocouple was installed at a position 2.5 gm % from the inner wall five orders downward from the upper end of the mold to record the temperature near the inner wall of the mold after the dummy ingot was brought into contact with the molten metal in the mold circle. Molten metal temperature is 720°
The dummy ingot was a round bar made of 99.99 thialuminium with a diameter of 19.5 mm, and the tip was a conical shape with a height of 7 mm. Initially, the output of the heating element for heating the mold was set to 100W, and the dummy ingot was placed 17m from the tip.
Immediately after being pushed into the mold and brought into contact with the molten metal, the output of the heating element for heating the mold was maintained at 500W. After several experiments, when the temperature near the inner wall of the mold reached 700'C and the ingot was pulled up, the dummy ingots in the 17th order that had been pushed in remained unmelted for 5 hours, leaving 9 of the remaining 12 ingots. It was found that #III+ was melted and the dummy ingot and molten metal were in a continuous state, and failures at the start of ingot pulling became almost non-existent. As soon as ingot pulling starts, the output of the heating element for heating the mold is reduced to 100 W, and 300 t/min of cooling nitrogen is supplied to the dummy ingot and the ingot from the ingot cooling device installed on the hook mold. I guessed it. The casting speed immediately after drawing area #3 is set at 100 am/min or more until the unmelted portion of the dummy ingot reaches the top of the mold, and then the solidification position of the ingot light surface is directly above the top of the mold. The casting speed was controlled so that The smooth and beautiful casting surface of the obtained ingot began to deteriorate after ni after the start of casting. The time it took for the dummy ingot to reach the casting start area after it came into contact with the molten metal in the mold was about 7 minutes.

Example 2 This example uses vertical continuous casting using a heated mold.
9.99% aluminum direct 2f) # is shown for the case where a round bar is cast according to another embodiment of the present invention. @ type has an inner diameter of 2 onrM, an outer diameter of 4 mm, and a height of 4
A nickel-chromium wire was attached to the periphery of silicon carbide to form a heating element for heating the mold. In addition, an alumel-chromel thermocouple was installed at a position 5#R lower than the upper end of the mold and 2.5Fa center from the inner wall, and the temperature at the temperature measurement point was 680.
The output of the heating element for mold heating is controlled using differential, integral, and proportional control so that the temperature is ±1°C, and at the same time, the output of the heating element for mold heating is controlled using JJt 34 Body output was recorded. Except for this, @■
The maximum output of the heating element was 500W. The type of dummy/ingot shown in Fig. 3 was used. That is, the tip of the dummy ingot has a diameter of 19.5 mm and a length of 62 mm, and its tip has a conical shape! , a 99% aluminum round bar was used.

At the rear end of the dummy ingot is a straight 1+19.5m 99.99
% aluminum, insert silicon nitride with an outer diameter of 19.5 am, an inner diameter of 5 mm, and a length of 25 mm between the tip and rear end of the dummy ingot. They were connected using screws with a diameter of 4 days. The molten metal was maintained at 720"C, and after the molten metal was aligned with the top of the mold, a dummy ingot was pushed into the 17!ll1II mold from the tip and brought into contact with the molten metal several times. After the above experiment, when the average output of the heating element for heating the mold over the past (9) seconds reaches 250 W, which is required to maintain the temperature of the inner wall of the mold at 680°C ± 1°C, ingot pulling is started. The 17th gummy that was pushed in! The ingot is in a state of melting), the remaining 12mm
It was found that the dummy ingot and the molten metal were melted, and the dummy ingot and molten metal were in a continuous state, making it easier to pull up the ingot with almost no failures when starting to pull up the ingot. The time required from bringing the dummy ingot into contact with the molten metal in the mold to starting casting was about 6 minutes.

Example 3 In this example, 9 pieces were made by vertical bottom drawing continuous casting using a heating mold.
This figure shows a case where a round bar of 9.9% tin with a diameter of 12 m was cast according to the present invention. The mold is made of stainless steel with an inner diameter of 12mm, an outer diameter of 20mm, and a height of 40+m.
A nickel-chrome wire was attached around it to create a heating element for heating the mold. In addition, an alumel-chromel sheathed thermocouple with a diameter of 1.6+o+ was attached to the center of the mold, 15 mm above the lower end of the mold, and the temperature of the molten metal in the mold was recorded. The output of the heating element for heating the mold was set to 100 W, and the temperature of the molten metal was set to 240°.
I kept it at C. The dummy ingot has a diameter of 11.5mm.
A 9% tin round rod was used, and its tip was not conical but flat. From the bottom outlet of the mold, where the molten metal surface and the top surface of the mold were flush with each other, the sidummy ingot was pushed into the mold by IOm from the bottom, and the molten metal was poured into the mold from the top inlet of the mold and held in this state for a while. After several experiments 1. If the lowering of the dummy ingot is started when the temperature of the self-molten metal in the mold reaches 265°CK, the tip of the pushed 10m dummy ingot will be in a state of melting, and the remaining 51M will be melted. It was found that the dummy ingot and the molten metal became integrated and continuous, and there were almost no failures when starting to pull up the ingot. The time required from bringing the dummy ingot into contact with the molten white metal mold to starting casting was 4 minutes.

Example 4 In this example, an outer bar made of 99.9% zinc and having a diameter of 12+o+ was continuously cast using vertical downward drawing type continuous casting. The mold used was silicon carbide made by the same company, with a diameter of 12 mm and a height of 40 mm, and a nickel-chromium wire was attached around it to serve as a heating element for heating the mold. For dummy ingot @ diameter IL5rnM
Using a round bar made of 99.9% zinc, its tip is 5 rrm.
f It was made into a conical shape. In addition, a horizontal hole was made at the 30th position from the tip of the dummy ingot, and an alumel-chromel thermocouple was inserted therein for identification, and the dummy ingot temperature was recorded. The output of the @-type heating element was set to 250W, and the temperature of Jokin Kaede's molten metal was set to 460°C.
I tried to keep it at . Dummy o1o. Ya T Yude. more than 15
'yes @ Yauchiyo push, put.

Then, molten metal was injected from the upper inlet of the m-type, and this state was maintained for a while. After several experiments, if we start lowering the dummy ingot when the temperature of the dummy ingot reaches 300'C, the 15 dummy ingots pushed in will be in an unmelted state. It was found that the remaining eight pieces were melted and the dummy ingot and the molten metal were integrated into a continuous state, and there were almost no failures when starting to draw down the ingot. The time required from bringing the dummy ingot into contact with the molten white metal mold to starting casting was approximately 3 minutes (9) seconds.

Example 5 This example is based on Example 1, but uses a dummy ingot having the shape shown in Fig. 2, that is, the tip of the dummy ingot is made of 99.99% aluminum with a diameter of 19.5++t.
A round bar with a length of 62 mm was used, and its tip 7 had a conical shape. Also, the rear end of the dummy ingot has an outer diameter of 1'9.5+
A stainless steel IQ Eve with a diameter of 15.5 m and an inner diameter of 15.5 m was used.

According to this example, the time from bringing the dummy ingot into contact with the molten metal until the start of casting was about 3 minutes, which was halved compared to the first example.

Although the above embodiments have been shown for vertical top stripping type and bottom drawing type continuous casting, it is clear that the method of the present invention can be similarly applied to horizontal horizontal drawing type continuous casting.

Incidentally, the method of the present invention is particularly effective when attempting to cast zero ingots at the same time in heated mold continuous casting. That is, since it takes time to melt within the range of the tip of the dummy ingot, the control for starting the four-time withdrawal of a plurality of ingots is stored in each station.

[Brief explanation of drawings]

FIG. 1 is an explanatory view showing an embodiment of the method for starting ingot casting in the heated mold continuous casting method of the present invention, and FIGS. 2 and 3 are oil-cut diagrams showing aspects of a dummy ingot, respectively. 1... Molten metal holding furnace, 2... Molten metal throughout the area, 3... Mold, 4... Fixed machine hole, 5... Heating element, 6... Thermocouple, 7... Dummy ingot , 8... Ingot cooling device, 9...
・Inlet, 10... = outlet, 11... pinch roller - 112, 14... tip of dummy ingot, 16...
Insulating ring patent applicant O.C.C. Co., Ltd. Nippon Light Metal Co., Ltd. Figure 1 Voluntary procedure amendment April 10, 1980 Patent application No. 46930 2, name of invention Heat mold type Ingot casting method 4 in the continuous casting method, Column 8 of the agent's claims, Contents of the amendment, Attached document, Patent Application No. 1982-46930, Claims are amended to follow the lower manure. 1. The molten metal inside the mold is accessed from the inlet end of the mold, which has an outlet for drawing out the ingot and an inlet for supplying the molten metal, and the temperature of the inner wall of the outlet is maintained at least at a temperature higher than the solidification temperature of the metal to be cast. The molten metal is supplied to the tip of the dummy ingot inserted into the mold from the outlet end, and held for a while to melt the vicinity of the tip of the dummy ingot, and then the dummy ingot is pulled out from the mold outlet. An ingot casting method in the heating mold continuous casting method characterized by the following. 2. An ingot casting method in the heated mold continuous casting method according to claim 1, in which the material of the tip of the dummy ingot is a metal material having almost the same melting point as the metal to be cast. 2. A method for producing an ingot in a heated mold continuous casting method according to claim 1, wherein the material for the tip of the dummy ingot is a gold powder having substantially the same composition as the metal to be cast. 4. Claims 1 to 3 that reduce heat transfer from the front end to the rear end of the dummy ingot - Replacement heating mold type continuous - Ingot casting method in Shinpo. 5. While keeping the calorific value of the heating element for heating the mold constant, the temperature near the mold outlet end is determined in advance by the type of metal to be cast, the cross-sectional shape of the ingot, the shape of the dummy ingot, the shape of the mold, and the material of the mold. The heating mold method according to Claims 1 to 4, wherein melting of the tip of the dummy ingot is detected by detecting that the tip of the dummy ingot has reached a set standard value. Ingot casting method is a continuous casting method. 6. A heating element for heating the mold so that the temperature near the inner wall of the mold WO end becomes a value determined in advance according to the type of metal to be cast, the cross-sectional shape of the ingot, the shape of the dummy ingot, the shape of the mold, and the material of the mold. While controlling the calorific value of the metal, the calorific value required for this has reached a standard value predetermined by the type of metal to be cast, the cross-sectional shape of the ingot, the shape of the dummy ingot, the shape of the mold, and the material of the mold. According to the heating mold type continuous casting method according to any one of claims 1 to 4, any ingot casting method may be used. Law. 7. The dummy ingot shape is based on the type of metal to be cast in advance,
A patent claim that detects that the tip of the dummy ingot has melted by detecting that a standard value determined by the cross-sectional shape of the ingot, the shape of the dummy ingot, and the temperature detection position in the dummy ingot has been reached. The ingot casting method in the heated mold continuous casting method according to any one of the ranges 1 to 4. 8. The temperature of the molten metal in the fin mold is in advance the type of metal to be cast, the cross-sectional shape of the ingot, the shape of the dummy ingot, the shape of the mold, the material of the mold, the temperature detection position of the self-molten metal in the mold, and the heat generation for mold heating that is becoming constant. A patent granted by Bamboo that detects that the tip of the dummy ingot has melted by detecting that it has reached a standard value determined by the calorific value of the body or the temperature near the inner wall of the mold outlet end, which is being controlled at a constant level. Applicant Nippon Light Metal Co., Ltd. O Co., Ltd. See, see

Claims (1)

[Scope of Claims] 1. An inlet of a mold having an outlet for discharging by zone and an inlet for supplying molten metal, and maintaining the inner wall temperature of the outlet at least at a temperature higher than the solidification temperature of the metal to be cast. Molten metal is supplied into the mold from the end, and the molten metal is brought into contact with the tip of a dummy mold inserted into the mold from the outlet end, and held for a while to melt the vicinity of the tip of the dummy ingot. An ingot casting method in the heated mold continuous casting method, which is characterized by drawing out the ingot from the mold outlet. 2. The material for the tip of the dummy ingot was a metal material having almost the same melting point as the metal to be cast. An ingot casting method in the heated mold continuous casting method described in IFF 0 range item 1. 3. The ingot manufacturing method in the heated mold continuous casting method according to claim 1, wherein the metal to be cast as the material of the tip portion of the dummy ingot and the t-hill have the same metal composition. 4. An ingot casting method in the heated mold continuous casting method as set forth in claims 1 to 3, in which heat transfer from the front end of the dummy ingot toward the rear end is reduced. 5. While keeping the calorific value of the heating element for heating the mold constant, the temperature near the mouth end of the mold is determined in advance depending on the type of metal to be cast, the cross-sectional shape of the ingot, the shape of the dummy ingot, the shape of the @ mold, and the material of the mold. The heated mold continuous casting method according to claims 1 to 4, wherein melting of the tip of the eye dummy ingot is detected by completely detecting that the tip of the eye dummy ingot has been reached. Ingot casting method in 6. The temperature near the inner wall of the mold outlet end is 1
Class 1i1, the heat generated by controlling the calorific value of the heating element for heating the mold so that it becomes a clay shaped by the cross-sectional shape of the ingot, the shape of the dummy ingot, the shape of the mold, and the material of the mold. The amount depends on the type of metal to be cast in advance, the cross-sectional shape of the ingot,
By detecting that the standard value determined by the shape of the dummy ingot, the shape of the mold, and the material of the mold has been reached,
An ingot casting method in a heated mold continuous casting method according to claims 1 to 4, wherein melting of the tip of the dummy ingot is detected. 7. The dummy ingot temperature is the A1 type of the metal to be cast in advance,
By detecting that a standard value determined by the cross-sectional shape of the ingot, the shape of the dummy ingot, and the temperature detection position on the dummy ingot has been reached, it is detected that the tip of the dummy ingot has melted. An ingot casting method in the heated mold continuous casting method according to claims 1 to 4. 8. The temperature of the molten metal in the mold is in advance the type of metal to be cast, the cross-sectional shape of the ingot, the shape of the dummy ingot, the material of the mold shape, the detection position of the molten metal temperature in the mold, the casting that is becoming constant, and the heat generation for mold heating. By detecting that a standard value determined by the calorific value of the body or the temperature near the inner wall of the mold outlet end, which is being controlled at a constant level, has reached a standard value, it is detected that the tip of the dummy ingot has melted. An ingot casting method in the heated mold continuous casting method according to claims 1 to 4. 9. An ingot casting method in the heating@type continuous casting method according to claims 1 to 8, wherein heat transfer from the front end to the rear end of the dummy ingot is reduced. 10. The ingot casting method in the heat-adjustable continuous casting method according to claim 9, wherein a heat insulating material is used in the portion of the dummy ingot other than the tip as a heat transfer reducing means. 11. The ingot casting method in the heating@type continuous casting method according to claim 9, wherein the dummy ingot is hollow except for the tip thereof as a heat transfer reducing means. 12. Heating according to claim 9, in which the heat transfer reducing means uses a whole set material with lower thermal conductivity than the gold ingot material used for the tip of the dummy ingot, except for the tip of the dummy ingot. Ingot casting method in type continuous casting method.