JPH0515966A - Method for controlling pressurized molten metal supplying and the same method in fixed cycle - Google Patents

Abstract

PURPOSE:To correct tendency where molten metal supplying quantity is gradually reduced and to supply a molten metal with high accuracy by starting pressurizing in an air pressure molten metal supplying furnace and supplying the molten metal in a longer time by the time corresponding to the fixed ratio of time until a molten metal supplying sensor arranged at the molten metal supplying tube detects the molten metal. CONSTITUTION:The tendency where the holding quantity of the molten metal 2 in the air pressure molten metal supplying furnace 1 is reduced by supplying the molten metal and the molten metal supplying quantity itself is gradually reduced is changed to supply the molten metal in longer time by the time corresponding to the fixed rate of the time until the molten metal 2 where the molten metal sensor 6 arranged at the fixed point of the molten metal discharging hole 5 of the molten metal tube 3 for supplying the molten metal 2 provided on the air pressure molten metal supplying furnace 1 to the outside of the furnace 1 detects the molten metal 2 raising in the molten metal tube 3 every time through the molten meter 3 from the furnace 1 for molten metal.

Description

Detailed Description of the Invention

[0001]

[Industrial application] The present invention relates to a control technology of a pneumatic hot water furnace which uses a pressure applied by a compressed gas used in a foundry or the like.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 51-A1 discloses a pneumatic hot water heating furnace which uses the pressure of compressed gas used in a foundry or the like.
Various techniques including the technique shown in 36704 have been invented, devised and put into practical use. However, in any case, due to the inevitable decrease in the amount of molten metal held in the pneumatic hot water supply furnace due to hot water supply, the amount of pressurizing gas supplied to the pneumatic hot water supply furnace is small at each time. As a result, in order to supply the same amount of hot water, the elapsed time from the start of pressurization in the furnace to the completion of hot water supply gradually increases, and the cause cannot be determined. It is known from experience that there is a tendency for the amount of hot water supply to gradually decrease, although the tendency varies depending on the pneumatic hot water supply furnace and / or the required amount of hot water supply.

However, due to technical requirements such as efficient production, production of complex thin castings, and die design, the demand for more accurate casting based on the combination of individual casting machines and dies in recent years. As a result, there has been an increasing demand for more accurate and constant supply of molten metal from the pneumatic hot water furnace to the casting machine. However, with the pressurization control of the prior art, it has been difficult to realize hot water supply with high quantitative accuracy in all regions of the amount of molten metal held in the pneumatic hot water supply furnace.

[0004]

The cause of the present invention is that the cause cannot be determined, as described above in the prior art, but the tendency varies depending on the individual pneumatic hot water heating furnace and / or the required hot water supply amount. A technical problem is to realize a pressurized hot water supply control method for a pneumatic hot water supply furnace that automatically corrects the tendency of the amount of hot water supply to decrease and realizes more stable and highly accurate hot water supply.

[0005]

The present invention will be described with reference to the accompanying drawing 3. 1 since the applicant was involved in licensed production of pneumatic hot water furnace based on Japanese Patent Publication 51-36704
Although the cause cannot be determined as described above based on the analysis of the collected data based on nearly 0 years of experience, and the tendency varies depending on the individual pneumatic hot water furnace or the required hot water supply, Due to the inevitable decrease in the amount of molten metal held in the pressure hot water supply furnace 1, it is necessary to increase the amount of supply of the pressurizing gas into the air pressure hot water supply furnace 1 at a slight rate every time, and as a result, the same amount is required. In order to supply the amount of hot water to be supplied, the elapsed time from the start of pressurization into the furnace to the completion of the hot water supply is gradually increased, and in particular, the pneumatic hot water supply furnace 1 from the start of pressurization into the furnace That the time until the molten metal 2 is detected by the hot water supply sensor 6 that detects the arrival of the molten metal 2 provided at the outlet 5 of the hot water supply pipe 3 is correlated with the decreasing tendency of the amount of hot water supply There was found.

A hot water supply sensor 6 for detecting arrival of the molten metal 2 provided at a hot water outlet 5 of a hot water supply pipe 3 of the pneumatic hot water supply furnace 1 after the pressurization of the pneumatic hot water supply furnace 1 is started. The correlation between the increase in the time until the molten metal 2 is detected and the decreasing tendency of the amount of hot water supply is the same if the control conditions in the pneumatic hot water supply control based on Japanese Patent Publication 51-36704 are set to be the same. It has been clarified that the proportional relationship expressed by the following equation 1 is established in the pneumatic hot water supply furnace 1.

[0007]

[Equation 1]

Where DW is the amount of hot water supplied each time: is the constant for decreasing the amount of hot water supply TEK: The time from the start of pressurization into the furnace each time until the molten metal is detected by the hot water supply sensor TEKMIN: The molten metal of the pneumatic hot water supply furnace Reference time from the start of pressurization at the reference holding amount in the furnace to the detection of molten metal by the hot water supply sensor DWO: Reference hot water supply amount at the reference holding amount in the molten metal of the pneumatic hot water supply furnace

That is, although there is an extremely small amount, the decrease continues in a proportional relationship. According to the hot water supply control method for the normal pneumatic hot water supply furnace, pressurization by gas to the pneumatic hot water supply furnace 1 is started, and the hot water supply pipe 3 for supplying the molten metal 2 in the pneumatic hot water supply furnace 1 to the outside of the furnace is discharged. After being detected by the hot water supply sensor 6 provided at the gate 5, a constant pressure increase is continued and the pressurization is stopped, and thereafter the pressure response delay, which is a characteristic of the gas that is a compressible fluid, is used for a fixed time. Achieves rapid hot water supply and quantitative hot water supply. Therefore, in the case of the pneumatic hot water supply furnace in which the decreasing tendency is remarkable, the operator constantly flows out after the pressurization is stopped, which is originally a constant time according to the remaining amount of the molten metal 2 in the pneumatic hot water supply furnace 1. The hot water supply timer value of the control panel (not shown) is appropriately changed. Therefore, in the present invention, a correction relational expression of the following equation 2 is derived from the proportional decrease relation described above, and correction data is input in advance on a control panel surface (not shown) to automatically correct the hot water supply timer value.

[0010]

[Equation 2]

Where TD: actual hot water supply timer value TDO: hot water supply timer set value TEK: time from the start of pressurization into the furnace each time until the molten metal is detected by the hot water supply sensor TEKMIN: metal of the pneumatic hot water supply furnace Reference time from the start of pressurization at the reference holding amount in the molten metal furnace until the molten metal is detected by the hot water supply sensor (actual measurement value) TEKMAX: Start of pressurization at the reference holding amount in the metal molten metal furnace of the pneumatic heating furnace Maximum time until the sensor detects molten metal (measured value) x: Hot water supply timer correction factor

Further, the above-mentioned (means for solving the problem) is combined with the invention described in the fixed cycle hot water supply control method of the patent application filed by the applicant on June 10, 1991, and the pneumatic hot water heating furnace is combined. 1 is started by pressurization by gas, and is detected by a hot water supply sensor 6 provided at a hot water outlet 5 of a hot water supply pipe 3 for supplying the molten metal 2 in the pneumatic hot water supply furnace 1 to the outside of the furnace. Is substantially constant during the casting cycle by the casting machine, so that claim 1 of the present invention is configured to have a constant cycle as much as possible.

[0013]

According to the method of claim 1 of the present invention, Japanese Patent Publication No.
In the conventional method based on 1-36704, the increase / decrease of the hot water supply timer value during the operation, which is required by the individual difference of the pneumatic hot water supply furnace or the amount of hot water supply, is required by some initial trial run adjustments. It becomes unnecessary by inputting the setting data in advance.

Further, according to the method of claim 2 of the present invention, it is required according to the individual difference of the pneumatic hot water furnace or the amount of hot water supplied in the conventional method according to JP-B-51-36704 according to claim 1. In addition to the fact that it is not necessary to increase or decrease the hot water supply timer value during operation by previously inputting some setting data obtained by the initial trial run adjustment, in addition to the automatic increase of the hot water supply timer value, Although there is a slight difference in the entire casting cycle depending on the casting machine, it is possible to supply hot water that does not significantly change the entire casting cycle.

[0015]

1 is a chart of a pressurized hot water supply control method according to claim 1 of the present invention, and FIG. 3 is an embodiment of a pneumatic hot water supply furnace according to claims 1 and 2, and FIG. An embodiment relating to claim 1 of the present invention will be described with reference to FIG.

The molten metal 2 is replenished to the pneumatic hot water supply furnace 1 from the opening 13 of the hot water receiving pipe 9, and the replenishment is normally stopped when detected by the full sensor 22. If replenishment is stopped, the hot water inlet lid 13 is closed, and two reference values of hot water supply amount control, that is, pneumatic hot water supply are performed using the data setter of the control panel (not shown) of the pneumatic hot water supply furnace 1. Furnace 1
Is pressurized by the gas from the pressurization source 19, and the molten metal 2 rising from the hot water supply pipe 3 for supplying the molten metal 2 provided in the pneumatic hot water supply furnace 1 to the outside is supplied to the hot water supply pipe 3 Even after the molten metal 2 is detected by the hot water supply sensor 6 provided at the hot water outlet 5, the pressure increase value is further increased, and after the pneumatic hot water supply furnace 1 reaches the pressure increase value, the external pressure is constantly increased externally. When the hot water supply timer set values (TDO in the equation 2), which are the times for the molten metal 2 to flow out, are input, the pneumatic hot water supply furnace of the present embodiment is in a state of waiting for a hot water supply command from the casting machine.

Here, the pneumatic hot water supply furnace 1 is pressurized by the gas from the pressurizing source 19 based on the actually measured data in advance of the trial run adjustment before the main operation, and the pneumatic hot water supply furnace 1 is provided in the pneumatic hot water supply furnace 1. Hot water supply pipe 3 for supplying molten metal 2 to the outside
The molten metal 2 rising upwards from the tap 5 of the hot water supply pipe 3
Value when the molten metal 2 is detected by the hot water supply sensor 6 provided in the inside of the pneumatic hot water supply furnace 1 at the standard full amount of the molten metal 2 held in the furnace, that is, the hot water supply sensor Minimum value of actual detection time (TEKMIN in equations 1 and 2)
And the value of the minimum holding amount of the molten metal 2 that can be safely heated by the air pressure from the pneumatic hot water supply furnace 1, that is, the maximum value of the hot water sensor detection time actually measured (TEKMAX in Equations 1 and 2). Data and a pressurizing timing adjustment timer value capable of setting a fine adjustment as to when to start pressurizing the pneumatic hot water furnace 1 at which timing of the operation of the casting machine,
Although the most appropriate value can be found in actual operation, the hot water supply timer correction rate (x in Formula 2) for correcting the hot water supply amount decreasing tendency calculated from the hot water supply accuracy data for trial run adjustment is routine. Naturally, it is input as basic data using a data setter of the control panel (not shown) prior to such operation.

When a hot water supply command is transmitted from a casting machine (not shown) to a control panel (not shown) of the pneumatic hot water supply furnace 1, the pressurizing timing adjusting timer in the control panel starts counting down. The countdown of the pressurization adjustment timer is continued until the pressurization timing adjustment timer value is reached. When the pressurizing timing adjusting timer counts up, the supply of gas from the external pressurizing source 19 to the inside of the pneumatic hot water supply furnace 1 via the pressurizing electromagnetic valve 16 is started. Pressure solenoid valve 16 from the pressure source 19 to the pneumatic hot water supply furnace 1
When pressurization is started via the molten metal 2 held in the pneumatic hot water supply furnace 1, the molten metal 2 rises in the hot water supply pipe 3. At the same time, counting is started by a counter in a control panel (not shown) of the pneumatic hot water supply furnace 1, and the elapsed time of pressurization by the gas to the pneumatic hot water supply furnace 1 is measured. When pressurization by the gas to the pneumatic hot water supply furnace is continued, the molten metal 2 continues to rise in the hot water supply pipe 3, and is eventually detected by the hot water supply sensor 6 installed at the hot water outlet 5 of the rising pipe. The value of the elapsed time of pressurization by the gas measured by the counter at this time is transferred to the calculator.

As described above, the hot water supply pipe 6 is provided by the hot water supply sensor 6.
After the molten metal 2 that has risen inside is detected at the tap hole 10, the molten metal 2 is supplied to the casting machine (the die casting machine sleeve 8 in this embodiment) via the gutter 7. After that, the pressurization is continued until the pressure in the furnace of the pneumatic hot water supply furnace 1 reaches the preset pressure increase value, and when the pressure increase value is reached, the pressurization is stopped.

Thereafter, hot water supply is continued for the time of the hot water supply timer calculated by the calculator (not shown) in accordance with the equation 2, and after the lapse of the time, the internal pressure of the pneumatic hot water supply furnace 1 is released and exhausted. Hot water supply is stopped. It should be noted that the first hot water supply after the start of operation for casting, not after a temporary stop of operation, and the first hot water supply and operation immediately after receiving the amount of molten metal in the pneumatic hot water supply furnace and replenishment from external equipment For some reason, including the first hot water supply immediately after the hot water supply operation was emergency stopped and the hot water supply was restarted, and the amount of molten metal held in the pneumatic hot water supply furnace decreased, and the supply from external equipment was received. The hot water is closed while the lid of the hot water inlet is closed and the lid of the hot water inlet is closed while the signal is transmitted by the hot water inlet opening LS. In the case of each hot water supply of the first hot water supply immediately after being signaled by, the constant value 0 is selected for the hot water supply timer correction factor x, and the set time of the hot water supply timer is equal to the hot water supply timer reference value TEKMIN.

Next, FIG. 2 is a pressurized hot water supply control method chart according to claim 2 of the present invention, and FIG. 3 is an embodiment of a pneumatic hot water supply furnace according to claims 1 and 2, and FIG. With reference to FIG. 3 and FIG. 3, an embodiment relating to claim 2 of the present invention will be described.

Prior to the operation, the two hot water supply pipes are fixed at two reference values, that is, the start of pressurization by the gas from the external pressure source to the pneumatic hot water supply furnace at the standard full holding amount of the molten metal in the pneumatic hot water supply furnace. Similarly to the reference value A, which is the elapsed time until the detection of molten metal in the above, the addition of gas from an external pressure source to the pneumatic hot water furnace at the standard full holding amount of the molten metal in the pneumatic hot water furnace. The reference time B, which is the pressurizing timing adjustment time, is input to determine how long the pressure should be started after receiving the hot water supply command from the casting machine. The molten metal 2 is replenished from the hot water inlet port lid 13 of the hot water receiving pipe 9 and is normally filled with a full sensor 22.
Supply is discontinued if detected by. If replenishment is stopped, the hot water inlet lid 13 is closed, and two reference values of hot water supply amount control, that is, pneumatic hot water supply are performed using the data setter of the control panel (not shown) of the pneumatic hot water supply furnace 1. The furnace 1 is pressurized by the gas from the pressurization source 19, and the pneumatic hot water supply furnace 1
The molten metal 2 rising from the molten metal supply pipe 3 for supplying the molten metal 2 to the outside is detected by the molten metal supply sensor 6 provided at the outlet 5 of the molten metal supply pipe 3. After that time, the pressure increase value for further pressurization and the hot water supply timer set value (TDO in equation 2), which is the time for the molten metal 2 to flow out to the outside at a constant speed after the air pressure hot water supply furnace 1 reaches the above pressure increase value. ) Is input respectively.

The pneumatic hot water supply furnace is replenished with molten metal until it is detected by a full sensor attached to the pneumatic hot water supply furnace,
When the casting is started and the hot water supply command from the first casting machine is received, the pressurizing timing adjustment timer in the control panel of the pneumatic hot water furnace starts, while the constant value command is transmitted to the data value selection circuit and via the data transmission circuit. The subtraction constant value (normally zero value) is transmitted to the subtractor B, the subtraction constant value is subtracted from the reference value B, and the subtraction result (usually the same value as the reference value B) is set as the setting value of the pressurization timing adjustment timer. It is transferred to the numerical value comparison part of the timer and numerically compared to determine the start of pressurization to the pneumatic hot water furnace, and the transferred set value of the pressurization timing adjustment timer and the measured value of the pressurization timing adjustment timer are transferred. If they match, pressurization with gas into the pneumatic hot water supply furnace is started.

At the same time when the pressurization is started, the counter is started and the elapsed time until the hot water supply sensor detects the molten metal in the pneumatic hot water supply furnace which is rising in the hot water supply pipe is measured. If the molten metal is detected, the elapsed time data until the molten metal sensor detects the molten metal is transferred to the subtractor A, and the gas from the external pressurizing source to the pneumatic hot water supply furnace is input in advance. The value is subtracted by the reference value A, which is the elapsed time from the start of pressurization by the method to the detection of the molten metal at the hot water supply pipe fixed point. If the subtraction result is positive, the data is transferred / input to the data transmission circuit as the subtraction data of the subtractor B for determining the set value of the hot water supply for the next pressurization timing adjustment timer. If the subtraction result is negative, a constant value is treated as a constant value in data transmission regardless of the negative absolute value of the subtraction result. Of course, it may be treated as minus subtraction data (that is, addition) of the subtractor B in order to delay the start of pressurization from the standard based on the characteristics of the casting machine.

In addition, the value of the elapsed time of pressurization by the gas measured by the counter is transferred to the subtractor A and data is transferred to the arithmetic unit in parallel. After the molten metal 2 rising in the hot water supply pipe 3 is detected by the hot water supply sensor 6 at the tap 10 as described above, the molten metal is passed through the gutter 7 to a casting machine (in this embodiment, a die casting machine sleeve). 8)
Is supplied with hot water. After that, the pressurization is continued until the pressure in the furnace of the pneumatic hot water supply furnace 1 reaches the preset pressure increase value, and when the pressure increase value is reached, the pressurization is stopped.

Thereafter, the hot water supply is continued for the time of the hot water supply timer calculated by the calculator (not shown) in accordance with the equation 2, and after the lapse of the time, the internal pressure of the pneumatic hot water supply furnace 1 is released and exhausted. Hot water supply is stopped. It should be noted that the first hot water supply after the start of operation for casting, not after a temporary stop of operation, and the first hot water supply and operation immediately after receiving the amount of molten metal in the pneumatic hot water supply furnace and replenishment from external equipment For some reason, including the first hot water supply immediately after the hot water supply operation was emergency stopped and the hot water supply was restarted, and the amount of molten metal held in the pneumatic hot water supply furnace decreased, and the supply from external equipment was received. The hot water is closed while the lid of the hot water inlet is closed and the lid of the hot water inlet is closed while the signal is transmitted by the hot water inlet opening LS. In the case of each hot water supply of the first hot water supply immediately after being signaled by, the constant value 0 is selected for the hot water supply timer correction factor x, and the set time of the hot water supply timer is equal to the hot water supply timer reference value TEKMIN.

When the hot water supply is completed and the hot water supply command is received from the casting machine again, the data value selection circuit sends a reception command to the reception command in the control panel (not shown) of the pneumatic hot water supply furnace based on the control method of the present invention. Is selected, the data is transferred to the data transmission circuit as the subtraction data of the subtractor B, which is counted in the previous hot water supply, subtracted by the subtractor A, and is used to determine the set value of the pressurizing timing adjustment timer, as described above. -The input subtraction data is transferred from the data transmission circuit to the subtractor B and subtracted (or added) from the reference value B to change the set value of the pressurizing timing adjustment timer so that the hot water supply can always be started in the casting cycle of the casting machine. Hot water is supplied as it is done in a fixed cycle. Basically, it is the pneumatic hot water supply that is used as the subtraction value when determining the setting value of the pressurization timing adjustment timer at the beginning of casting and immediately after receiving the supply of molten metal from external equipment. Immediately before the time required for the hot water supply sensor 6 to detect the molten metal after starting the pressurization of the furnace 1 with the gas (even if the hot water supply is stopped and the time elapses, the control circuit is completely powered off). This is because a large error is inevitably caused when the actual measurement value of hot water is used unless the previous data is immediately before the remaining data. As a general rule, when hot water is supplied immediately after the start of hot water supply and immediately after the supply of molten metal, the actual measured data is reset and the hot water supply operation is performed assuming that the amount is the standard full capacity.

Incidentally, it goes without saying that the entire control method according to the present invention can be programmed and the entire control can be easily implemented as a microcomputer.

[0029]

As described above, according to the present invention, there is provided a hot water supply control method with high hot water supply accuracy, which enables stable, efficient, and safe production in casting a casting using a pneumatic hot water supply furnace. It was realized.

[0030]

[Brief description of drawings]

FIG. 1 Chart of pressurized hot water supply control method

FIG. 2 is a chart showing a constant cycle pressurizing hot water supply control method.

FIG. 3 is an example of a pneumatic hot water supply furnace according to claims 1 and 2;

[Explanation of symbols]

1 Pneumatic hot water furnace 2 molten metal 3 hot water supply pipe 4 Intake mouth 5 Outlet 6 Hot water supply sensor 7 gutter 8 die casting machine sleeve 9 Hot water pipe 10 Hot water inlet 11 Hot water inlet opening LS 12 Hot water inlet closed LS 13 Bath cover 14 Pressure control device 15 Reactor pressure conduit 16 Pressurized solenoid valve 17 Exhaust solenoid valve 18 Exhaust port 19 Pressure source 20 Inspection palate 21 inspection port 22 Full sensor

[Procedure amendment]

[Submission date] July 22, 1991

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

Claims (2)

[Claims] 1. In the control of a pneumatic hot water supply furnace which supplies a molten metal to the outside of the furnace by utilizing a pressurizing force of a compressed gas, the amount of the molten metal held in the pneumatic hot water supply furnace is decreased by the hot water supply, and gradually accompanied by it. The tendency of the amount of hot water supply itself to decrease is that the molten metal provided in the pneumatic hot water supply furnace is supplied to the outside of the pneumatic hot water supply furnace after the pressurization of compressed air to the pneumatic hot water supply furnace is started. The molten metal outlet located at a fixed point of the molten metal for the hot water supply pipe for each time, the air pressure of the molten metal is detected only for a time corresponding to a certain proportion of the time until the molten metal rising in the hot water supply pipe is detected. The first hot water supply after the start of operation for casting, not after a temporary stop of operation, and the molten metal in the pneumatic hot water supply furnace, so that hot water is supplied from the hot water supply furnace to the outside of the pneumatic hot water supply furnace through the hot water supply pipe for a long time. The first time immediately after the amount of Including the case of receiving an abnormal signal during hot water supply and operation, and immediately after stopping the hot water supply operation and restarting the hot water supply, the amount of retained metal in the first hot water supply and the pneumatic hot water supply furnace decreases and it is supplied from external equipment. For some reason, the fact that the lid of the inlet for receiving the molten metal is opened is for supplying hot water while the signal is transmitted by the opening LS of the inlet and the lid for the inlet is closed. Hot water inlet closed LS
Each hot water supply is corrected with the exception of the first hot water supply immediately after the signal is transmitted by the system, and each hot water supply is performed with high accuracy. Pressurized hot water control method. 2. In the control of a pneumatic hot water supply furnace for supplying molten metal to the outside of the furnace by utilizing the pressure of compressed gas, the pneumatic hot water supply is performed when the amount of metal molten metal held in the pneumatic hot water supply furnace is normally full. As a basis for setting the timing to start pressurization with gas to the furnace,
First hot water supply after start of operation for casting not after temporary stop of operation and amount of metal melt in the pneumatic hot water supply furnace decreased immediately after receiving supply from external equipment and during hot water supply For some reason, including the first hot water supply immediately after the abnormal signal is received and the hot water supply operation is immediately stopped and the hot metal supply is restarted, and the amount of metal molten metal held in the pneumatic hot water supply furnace is reduced and replenishment is received from external equipment. Signal is transmitted by the opening LS of the receiving opening for receiving the supply of the molten metal and the closing of the lid of the receiving opening is signaled by the closing LS of the receiving opening. Except for each hot water supply of the first hot water immediately after being transmitted, the actual cycle time for each hot water supply to the casting machine is measured, and the data of the difference from the previous actual cycle time is fed back, and the Pneumatic hot water furnace metal The holding amount of hot water decreases and it is necessary to increase the supply amount of the pressurizing gas to the pneumatic hot water furnace in order to supply an equal amount of hot water in proportion to the decrease amount, that is, the pressurizing time increases. In order to stabilize the cycle time for casting in the above casting machine by accelerating the start of pressurization by gas to the pneumatic hot water supply furnace in the next hot water supply in response to the above, pressurization starts when the above exclusion conditions are met. It is assumed that a constant value is set without performing any correction to accelerate the pressurization by gas to the pneumatic hot water supply furnace, and the molten metal is detected by the hot water supply sensor provided at the outlet of the hot water supply pipe of the pneumatic hot water supply furnace. The timing of the casting is constant for the casting machine and the constant cycle as the casting cycle is maintained, the amount of molten metal held in the pneumatic hot water supply furnace decreases due to the hot water supply, and the amount of hot water supply itself gradually decreases. The sky A hot water supply sensor arranged at a fixed point of the molten metal outlet of a hot water supply pipe for supplying the molten metal provided in the pneumatic hot water supply furnace to the outside of the pneumatic hot water supply furnace after starting pressurization of the hot water supply furnace with compressed gas From the pneumatic hot water supply furnace of the molten metal to the outside of the pneumatic hot water supply furnace only for a time corresponding to a fixed ratio of the time until the molten metal rising in the hot water supply pipe is detected. In order to supply hot water for a long time, the first hot water supply after the start of operation for casting, not after a temporary stop of operation, and immediately after the amount of retained metal melt in the pneumatic hot water supply furnace is reduced and replenishment from external equipment is received. In the case where an abnormal signal is received during hot water supply during operation and the hot water supply operation is stopped immediately after the hot water supply operation is emergency stopped and the hot water supply is restarted Replenishment of the above-mentioned molten metal for any reason including The lid of the hot water inlet is open LS
Hot water supply while the signal is being transmitted by the hot water supply and each time the hot water supply is corrected by excluding each hot water supply of the first hot water immediately after the signal is transmitted by the hot water inlet close LS A method for controlling constant-cycle pressurized hot water supply in a pneumatic hot water supply furnace using pressurizing force of compressed gas, characterized in that the hot water is supplied with high accuracy.