JP2991003B2 - Water heater for die casting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply apparatus for supplying molten metal to a die casting machine, and more particularly to a hot water supply apparatus in which molten metal is distributed through a hot water distribution path.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 61-463657 discloses the use of a hot water distribution path for distributing molten metal produced in a melting furnace to a hand furnace of a plurality of die casting machines. The amount of molten metal present in the hot water distribution channel is always adjusted to be substantially constant, and the molten metal is safely and stably supplied to each hand furnace. How the molten metal supplied to each hand furnace is distributed to the injection sleeve of the die casting machine is not described in the above publication and is unknown, but at the site, the molten metal in the hand furnace is Hot water is supplied by a ladle or supplied by a molten metal transfer device. As a hot water supply device of a die casting machine using a molten metal transfer device, a holding furnace for holding a molten metal, an injection sleeve communicating with a cavity of the die casting machine, a communication path for communicating the injection sleeve with the holding furnace, and a communication path for the same. There is known an apparatus including a molten metal transfer device that transfers molten metal from a holding furnace to an injection sleeve through a holding furnace.

[0003]

SUMMARY OF THE INVENTION The present inventor has attempted to improve the distribution stability and work safety of molten metal by combining the hot water supply path described in the above publication with a hot water supply device including a molten metal transfer device. As a result, it became clear that the hot water supply device of the die casting machine to which the hot water distribution path was connected had the following problems. that is,
The pressurized molten metal transfer device cannot be used. In a pressurized molten metal transfer device that transfers molten metal in a holding furnace to an injection sleeve of a die casting machine by supplying pressurized gas into the holding furnace, a hot water distribution path that communicates with the holding furnace even if gas is sent into the holding furnace. Then, the gas leaks through the process and the inside of the holding furnace does not become pressurized. Accordingly, the present invention provides pressure
It is an object to obtain a hot water supply device of a die casting machine that can use a molten metal transfer device of a type .

[0004]

Means for Solving the Problems In order to solve the above problems, a first invention comprises: (a) a holding furnace for holding a molten metal; and (b)
Injection sleeve that communicates with the cavity of the die casting machine
And (c) communicating the injection sleeve with the holding furnace.
And (d) supplying pressurized gas into the holding furnace.
The molten metal from the holding furnace to the injection sleeve through the communication path of
A water heater of a die casting machine including a melt transfer device that pressurized, provided with a holding furnace and communicating with Haiyuro, at least, the hot water supply period from the holding furnace to the injection sleeve
The gist of the present invention is to provide a shut-off device that cuts off the communication between the holding furnace and the hot water distribution path. According to a second invention, in the hot water supply device for a die casting machine according to the first invention, a communication hole for communicating the inside and the outside of the holding furnace is provided at a position lower than the opening of the communication path to the holding furnace. In addition, the gist is that a closing means for closing the communication hole is provided.
In addition, as the closing means, for example, a stopper, a manually operated valve, or a power opening / closing device that can be directly inserted into the communication hole by an operator can be adopted.

[0005]

In the hot water supply apparatus according to the first invention, at least
Both during the hot water supply period from the holding furnace to the injection sleeve
Since the communication between the furnace and the hot water distribution path is cut off , even if the pressurized gas is supplied to the holding furnace for hot water supply, the pressurized gas does not leak to the hot water distribution path. Further, if the communication hole and the closing means are provided according to the second invention, the inside and the outside of the holding furnace can be communicated as needed at a position lower than the opening of the communication passage to the holding furnace. Therefore, by interrupting the communication between the holding furnace and the hot water distribution path by the shutoff device and opening the closing means, it is possible to easily discharge the molten metal in the communication path without stopping the supply of the molten metal to the hot water distribution path. It is possible to lower the molten metal level in the holding furnace. Further, when the closing means is provided at the bottom, the molten metal in the holding furnace can be easily and almost completely discharged.

[0006]

According to the first aspect, the pressurized molten metal transfer is performed.
The use of the device becomes possible. According to the second invention, by making the inside and outside of the holding furnace communicate with each other at a low position during maintenance, the molten metal in the communication passage is completely discharged, and the molten metal in the holding furnace is also completely discharged. Alternatively, the molten metal surface can be sufficiently lowered, and the maintainability of the hot water supply device can be further improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment common to the first and second inventions will be described below in detail with reference to the drawings. The die casting machine system shown in FIG. 1 includes a hot water distribution unit 10, a hot water supply unit 12, a die casting machine 14, and a control unit 15.

The hot water distribution unit 10 includes a hot water distribution gutter 16, a lid 18 with a heater for covering the upper part of the hot water distribution gutter 16, and a connection gutter 20. The hot water distribution gutter 16 forms a hot water distribution path for distributing the molten metal 21 supplied from a melting furnace (not shown) to each die casting machine 14, and the connection gutter 20 holds the hot water distribution gutter 16 and the molten metal 21. The holding furnace 22 is in communication.

The hot water supply unit 12 includes a holding furnace 22 and a pressure device 24.
And a molten metal level detecting device 26 and a shutoff device 28. The pressurizing device 24 constitutes a molten metal transfer device that transfers the molten metal by pressurizing the inside of the holding furnace 22, and the shutoff device 28 includes
And the distribution gutter 16 is cut off.

The holding furnace 22 is partitioned into hot water distribution chamber 34, pressurizing chamber 36 and hot water supply chamber 38 by partition walls 30,32.
The chambers 34, 36, 38 communicate with each other below the partition walls 30, 32 so that the molten metal 21 in the holding furnace 22 can move back and forth. The hot water distribution room 34 is provided with a hot water distribution port 40 and is connected to the hot water distribution gutter 16 via the connection gutter 20. The molten metal 21 in the hot water distribution gutter 16 is distributed from the hot water distribution port 40 to the hot water distribution room 34.

At the lower part of the hot water distribution room 34, there is a blocking wall 42,
The blocking wall 42 is provided with a communication hole 44 and is opened and closed by the blocking device 28. The shutoff device 28 has a communication hole 44
The communication hole 44 is opened and closed by inserting and pulling out the blocking plug 46 into and out of the communication hole 44. The blocking plug 46 is connected to a rod 54 of an air cylinder 52 via a blocking rod 48, and the air cylinder 52 is fixed to a support base 55 attached to the holding furnace 22. By switching the air circuit (not shown), the rod 54 is moved up and down, and the shutoff plug 46 is moved up and down.
The communication hole 44 is opened and closed.

At the lower part of the side wall of the holding furnace 22, there is provided a discharge port 56 which is a communication hole for communicating the inside and the outside of the holding furnace 22 and discharging the molten metal 21 to the outside during maintenance. Further, a drain plug 58 is provided as closing means for closing the drain outlet 56 in a normal state.

The pressurizing chamber 36 is provided with a supply / exhaust port 60, and the pressurizing device 24 is connected thereto. Pressurizing device 24
Is a pressurized air supply source 62 for supplying pressurized air into the holding furnace 22, a flow control valve 64 for adjusting the amount of pressurized air, communication between the flow control valve 64 and the pressurized air supply source 62, An electromagnetic valve 66 for shutoff and an electromagnetic valve 68 for communication and shutoff between the flow control valve 64 and the atmosphere are provided, and these are connected to each other by a pipe 70. The pressurizing chamber 36 is connected to a flow control valve 64 by a pipe 70. Further, a pressure detecting port 72 is provided in the pressurizing chamber 36, and a pressure gauge 76 is attached via a pipe 74.

Above the hot water supply room 38, a detection window 77 for detecting the height (hereinafter, referred to as a molten metal level) H of the molten metal surface in the hot water supply room 38 is formed. Molten metal level H
It is detected from the detection window 77 by the molten metal surface height detection device 26. The molten metal level H is detected as a distance between the molten metal surface in the hot water supply chamber 38 and the upper end of the hot water supply port 78. The hot water supply port 78 is provided at a lower part of the side surface of the hot water supply room 38 and is a supply port of the molten metal 21 to the die casting machine 14. The molten metal surface height detecting device 26 includes a support base 79 fixed to the holding furnace 22, an optical sensor 80 attached to the support base 79, and an interface 82.
The optical sensor 80 irradiates the inside of the hot water supply chamber 38 with laser light through the detection window 77, detects light reflected on the molten metal surface, and detects the molten metal level H. The information on the molten metal level H acquired by the optical sensor 80 is sent to the computer 84 of the control unit 15 via the interface 82.

The control unit 15 includes a computer 84, a control device 86, and an input device 88. The information on the molten metal level H sent to the computer 84 is processed according to a program stored in advance together with information on the amount of hot water W read from the input device 88. This process is performed by the RAM 90, the ROM 92, and the CPU 94 of the computer 84 shown in FIG. Various commands are sent to the control device 86 during the processing, and the flow control valve 6 is controlled via the control device 86.
4. The operation of the solenoid valves 66 and 68 is controlled.

At the lower part of the hot water supply chamber 38, a hot water supply pipe 100 for forming a communication path 98 for connecting the hot water supply chamber 38 and the injection sleeve 96 of the die casting machine 14 is attached.
The mounting position is lower than the height of the molten metal surface of the hot water distribution gutter 16. When the pressure chamber 36 is released to the atmosphere and the shut-off plug 46 is opened, and the height of the molten metal in the hot water supply chamber 38 and the height of the molten metal in the hot water distribution gutter 16 become the same, This is to prevent the air from entering. By preventing the entry of air into the hot water supply pipe 100, the generation of oxides is prevented and the hot water supply pipe 100 is prevented from being blocked.
An electric heater (not shown) is attached to the outside of the hot water supply pipe 100, and the temperature of the molten metal 21 is kept from solidifying.

The upper plate 10 of the die casting machine 14
2 is provided with a mold clamping cylinder 104, and the movable plate 10 is attached to a rod 106 of the mold clamping cylinder 104.
8 is attached. The movable plate 108 can move up and down along the tie bar 110 as the rod 106 of the mold clamping cylinder 104 moves up and down. A movable mold 112 is attached to the movable plate 108,
A fixed mold 116 is attached to the fixed plate 114. As the movable plate 108 descends, the movable mold 112
Is moved down while the movable mold 112 is in contact with the fixed mold 116.
A cavity 118 is formed in the interior of the fixed mold 116. An injection sleeve 96 is fitted into the fixed mold 116, and a hot water supply port 120 connected to the hot water supply pipe 100 is provided on a side surface of the injection sleeve 96. The lower end of the injection sleeve 96 is fixed to the injection cylinder 124 via the support sleeve 122. A plunger rod 128 is connected to a rod 126 of the injection cylinder 124.
The injection plunger 130 is attached to the tip.

The injection cylinder 124 is operated by an injection cylinder driving device (not shown) which operates according to a command from the computer 84 via the control device 86, and moves the injection plunger 130 up and down in the injection sleeve 96. In the initial state, the injection plunger 130 has an upper surface slightly lower than the lower end of the hot water supply port 120.

Next, the outline of the operation will be described. In the initial state of FIG. 1, the solenoid valve 66 is closed, the solenoid valve 68 is open, and the pressurizing chamber 36 is open to the atmosphere. The shutoff plug 46 of the hot water distribution room 34 is pulled up, and the molten metal 21 in the hot water distribution gutter 16 can flow into the pressurizing room 36 and the hot water supply room 38. The molten metal surface heights in the hot water distribution gutter 16, the hot water supply room 38, and the hot water supply pipe 100 are the same.

When a hot water supply command is issued from the computer 84 through the control device 86, a pneumatic circuit (not shown) is switched to operate the air cylinder 52, and the shutoff plug 46 is closed and arranged as shown in FIG. The hot water gutter 16, the pressurizing chamber 36 and the hot water supply chamber 38 are cut off, and a hot water supply preparation state is established.

Thereafter, based on the level H of molten metal in the hot water supply chamber 38 and the amount W of hot water required to obtain a molded product, the pressure chamber 36
A command to pressurize the inside is issued from the computer 84 to the control device 86. The flow rate control valve 6 is controlled by the control device 86.
4 is adjusted to the required opening degree and the electromagnetic valve 68 is closed, while the electromagnetic valve 66 is opened, and pressurized air is supplied from the pressurized air supply source 62 to pressurize the inside of the pressurizing chamber 36, and FIG. Is completed.

After the hot water supply is completed, the hydraulic circuit (not shown) is switched to operate the injection cylinder 124, the injection plunger 130 is raised to the position where the hot water supply port 120 is closed, and the molten metal 21 in the hot water supply pipe 100 and the injection sleeve 96 Of the molten metal 21 to be ready for injection.

When the injection preparation state is completed, the pressurizing chamber 36 is evacuated, and the height of the molten metal surface in the hot water supply pipe 100 is raised.
It can be lowered slightly below 20. Thereafter, the hydraulic circuit (not shown) is switched, the injection cylinder 124 is operated, the injection plunger 130 is raised, and the melt 21 in the injection sleeve 96 is filled in the cavity 118.
When the evacuation of the pressurized chamber 36 is completed, a pneumatic circuit (not shown) is switched to operate the air cylinder 52, the shutoff plug 46 is opened, and the amount of the molten metal 21 corresponding to the consumed molten metal 21 is supplied to the hot water distribution gutter. From 16, pressure is supplied to the pressurizing chamber 36 and the hot water supply chamber 38.

In the hot water supply device including the molten metal transfer device, maintenance is more necessary than in a hot water supply device using a ladle, but in order to perform maintenance, it is necessary to discharge the molten metal in the holding furnace 22. There is. However, when the hot water distribution path is connected, the molten metal is continuously supplied from the hot water distribution path, and the level of the molten metal in the holding furnace 22 cannot be sufficiently lowered. Therefore, when maintenance of the holding furnace 22 is performed, it is necessary to stop supplying the molten metal to the hot water distribution path, and it may be necessary to stop the operation of the hot water supply device that does not require maintenance.

[0025] However, for maintenance of the water heater, the holding furnace and Haiyutoi 16 closes the shutoff 46 22
Then, the drain plug 58 is removed in a state in which the drain plug 58 is shut off. Accordingly
Then, while the molten metal is supplied to the hot water distribution path, the holding furnace 22
Of the molten metal of the holding furnace 22 can be discharged.
Can be reduced sufficiently, and maintainability is improved.
You.

[0026] Moreover, since the discharge spout 56 is provided below the hot water supply port 78, the melt 21 is discharged completely in the hot water supply tube 100, also sufficient to perform maintenance melt surface level in the holding furnace 22 To a degree.

Next, a program for controlling the apparatus of this embodiment will be described in detail with reference to the flowchart shown in FIG. In step 101 (hereinafter referred to as S101), a hot water supply command from the input device 88 is awaited.
Is sent to the control device 86.
In S103, it is determined whether or not a change in hot water supply amount W due to a change in a device or the like is instructed from input device 88, and hot water supply amount W is determined.
If there is no change, S105 is executed, and if there is no change, S105
Step 104 is executed. In S105, after the new hot water supply amount W is read from the input device 88, the hot water supply amount W is read in S106.
There target melt level H ₁ in a state of being hot water in the injection sleeve 96 is calculated, after being stored in the target melt level memory 140 of RAM90 shown in FIG. 6, S107 is executed. On the other hand, in S104, after the target melt level H ₁ street far read from the target melt level memory 140, S107 is executed. Incidentally, when the first execution of the program, the hot water supply amount is read is the same as when there is a change in the hot water supply amount, target melt level H ₁ is set.

In S107, a signal from the optical sensor 80 is read via the interface 82, and after the molten metal level H in the hot water supply chamber 38 is detected, S108 is executed. Since both the hot water supply chamber 38 and the injection sleeve 96 are open to the atmosphere, the level of the molten metal surface H in the hot water supply chamber 38 and the height of the molten metal transferred to the injection sleeve 96 via the hot water supply pipe 100 are the same. become. Therefore, hot water supply room 38
Is detected as the height of the molten metal surface in the injection sleeve 96.

[0029] In S108, whether or not the molten metal level H has reached the target melt level H ₁ is determined, the melt level H
There is S112 if reached the target melt level H ₁ is executed, S109 unless reached is performed. S109
So whether the melt level H is greater than 0.9 times the target melt level H ₁ is determined. If the molten metal level H does not exceed 0.9 times the target melt level H _1, rapid pressurization pressure command so as to reduce the hot water supply time is issued to the controller 86, the pressurizing chamber 36 is pressurized rapidly pressurized S107 Subsequent processing is repeated. In contrast, if the molten metal level H is greater than 0.9 times the target melt level H _1, slow-speed pressurizing pressure command to raise the hot-water supply accuracy is issued to the controller 86, the pressurizing chamber 36 is gradually pressurized Then, the processing after S107 is repeated.

In S 112, a command to maintain the pressure in the pressurizing chamber 36 to maintain the molten metal level H at the target molten metal level H ₁ is issued to the control device 86. Injection sleeve 9 in S113
In order to separate the molten metal 21 in the hot water supply pipe 6 from the molten metal 21 in the hot water supply pipe 100, the injection plunger 130 is used to separate the hot water supply port 12.
A command to close 0 is issued to the control device 86, and it is waited in S114 that the position of the injection plunger 130 is detected by a position sensor (not shown) and the hot water supply port 120 is closed. When the hot water supply port 120 is closed, in S115 the pressurizing chamber 36
Is issued to the controller 86, and the pressurized chamber 36 is opened to the atmosphere. As a result, the level H of the molten metal in the hot water supply chamber 38 decreases, and the level of the molten metal in the hot water supply pipe 100 also decreases.
Move away from 30. In S116, the injection delay timer is operated in order to secure sufficient time for sufficiently lowering the molten metal level H. After waiting for the molten metal level H to decrease in S117, an injection start command is output to the control device 86 in S118. Then, the injection plunger 130 is raised. S11
After waiting for the completion of the exhaust of the pressurizing chamber 36 at 9, an open command of the shutoff plug 46 is issued to the control device 86 at S <b> 120, and
6 is communicated with the pressurizing chamber 36 and the hot water supply chamber 38.
In S121, it is determined whether or not hot water supply has been completed based on information from the input device 88. If there is a hot water supply end command, the execution of the program is terminated.

Next, a description will be given with reference to another program in the flowchart of FIG. Whereas the program is adapted to control the pressure in the pressurizing chamber 38 while comparing the molten metal level H of the hot-water chamber 38 and the target melt level H ₁ shown in FIG. 4, the program, hot water detecting the initial melt level H ₀ in the chamber 38, to determine the pressure conditions of the pressure chamber 38 based on the level difference [Delta] H ₁₀ is the difference of the initial melt level H ₀ and the target melt level H ₁ It has become. Obtains a target pressure increment [Delta] P ₁₀ corresponding to the level difference [Delta] H _10, is to shorten the hot water supply time by the amount corresponding to 0.9 times the [Delta] P ₁₀ which applies rapid pressure without detecting the melt level H .

Steps S201 to S206 correspond to step S1 in FIG.
Same as 01 to S106. In S207, the initial molten metal level H ₀ is detected, and in S208, the target molten metal level H ₁ is read from the target molten metal level memory 140 of the RAM 90 shown in FIG. 6, and the level difference ΔH _{10 from the} initial molten metal level H ₀ ( ΔH ₁₀ = H ₁ −H ₀ ) is calculated. S
209 target pressure increment [Delta] P ₁₀ is the pressure increment in the pressure chamber 36 required to eliminate the level difference [Delta] H ₁₀ is calculated by the 0.9-fold amount pressure increment of the target pressure increment [Delta] P ₁₀ wise at S210 A rapid pressurization command is issued to the control device 86 in order to quickly apply the pressure to the pressure chamber 36. After waiting for the completion of the rapid pressurization in S211, the pressurizing chamber 36 is pressurized at a very low speed in S212. S
At 213, the molten metal level H in the hot water supply room 38 is detected, and S21
4 S215 after the molten metal level H has reached the target melt level H ₁ has been confirmed is performed by. After S215,
This is the same as S112 and subsequent steps of the previous program.

[0033] further described with reference to another program in the flowchart of FIG. The program for the program of Figure 7 that calculates a target pressure increment [Delta] P ₁₀ in each cycle, stores the actual pressure increment [Delta] P _f, which is a final pressure increment in the previous cycle, the actual Pressure increment ΔP
_The pressurization of the pressurizing chamber 36 is performed rapidly based on _f .

[0034] By storing the actual pressure increment [Delta] P _f of the thus last, since it is possible to compare the current calculated target pressure increment [Delta] P ₁₀ was also made possible abnormality determination, such as pressure gauge 76 . Further, by using the previous actual pressure increment ΔP _f , even when the seal of the shutoff plug 46 is not perfect and the molten metal slightly escapes to the hot water distribution gutter 16 during the pressurization of the pressurizing chamber 38, it is appropriate. Rapid hot water supply becomes possible. When the molten metal 21 escapes to the hot water distribution gutter 16 during pressurization, the molten metal level H in the hot water supply chamber 38 decreases by an amount corresponding to the escaped amount.
Therefore, the molten metal level H of the hot-water chamber 38 and the target melt level H ₁ is only added target pressure increment [Delta] P ₁₀ calculated on the basis of the level difference [Delta] H ₁₀ is insufficient.
When determining such poor target pressure increment ΔP pressurization rate based on the ₁₀ switching, resulting in narrower range which applies rapid pressurization, the time required for the hot water supply is longer wider range of pressure very slow speed pressure. On the other hand, the previous actual pressure increment ΔP _f is a value including the escape of the molten metal 21 to the distribution gutter 16 of the molten metal 21. Therefore, _if the switching of the pressurizing speed is determined based on the actual pressure increment ΔPf, hot water can be supplied quickly.

Steps S301 to S303 are the same as in the previous two embodiments. When the change of the hot water supply amount W is instructed in S303, S308 of the program of FIG.
The same processing as 205 to S208 is executed. afterwards,
S312 target pressure increment [Delta] P _1c when hot water supply amount change based on the level difference [Delta] H ₁₀ is computed by, after being stored in the change time of the pressure increment memory 142 of RAM90 shown in FIG. 9, S313
And this target pressure increment ΔP _1c becomes the current target pressure increment ΔP ₁₀
And S314 is executed.

If the change of the hot water supply amount W is not instructed in S303, the final actual pressure increment ΔP _{f of} the pressurizing chamber 36 stored in S320 of the previous cycle is read from the actual pressure increment memory 144 in S304. It is. In S305,
The target pressure increment ΔP _1c at the time of changing the hot water supply stored in the pressure increment memory 142 at the time of change is read and the actual pressure increment ΔP _f
Is compared to The actual pressure increment ΔP _f becomes the target pressure increment ΔP _1c
It is determined whether or not it exceeds 0.95 times. If the actual pressure increment ΔP _f exceeds 0.95 times the target pressure increment ΔP _1c , S306 is executed. Actual pressure increment Δ
If P _f does not exceed 0.95 times the target pressure increment [Delta] P _1c, since the light sensor 80 or a pressure gauge 76 may not be normal, pressurized圧異normal display has been program execution ends at S338 I do.

[0037] In S306, whether or not the actual pressure increment [Delta] P _f is less than 1.05 times the target pressure increment [Delta] P _1c is determined, 1.05 actual pressure increment [Delta] P _f is the target pressure increment [Delta] P _1c
Smaller than doubled, S314 after the actual pressure increment [Delta] P _f is the target pressure increment [Delta] P ₁₀ of this at S307 is executed. However, if the actual pressure increment ΔP _f is not smaller than 1.05 times the target pressure increment ΔP _1c, an abnormal pressurization is displayed in S338, and the execution of the program ends.

In S314 to S319, the same processing as in S210 to S215 of the program in FIG. 7 is performed. In S320, the final value of the pressure increment of the obtained pressurizing chamber 36 in S319 is stored in the actual pressure increment memory 144 as the actual pressure increment [Delta] P _f. Thereafter, the processing from S330 to the end of the flowchart is the same as the processing from S216 of the program in FIG. 7 to the end of the flowchart.

Although several embodiments common to the first and second inventions have been described above, the present invention is not limited to these embodiments, and only the first invention may be implemented independently. Ma
In addition, the position where the communication between the hot water distribution gutter 16 and the holding furnace 22 by the shutoff device 28 is cut off is not limited to the inside of the holding furnace 22 or the connection gutter 20 but may be inside the hot water distribution gutter 16. In addition, hot water tap 58
Is not limited to the side wall of the holding furnace 22, and the holding furnace 2
The second bottom wall may be used. Further, the drain port 56 may be opened and closed using a valve or the like instead of the drain plug 58. The communication between the holding furnace 22 and the outside may be via a communication pipe or the like connected to the hot water outlet 56, and the communication pipe may be connected to a container or the like. In addition, without departing from the scope of the claims, the present invention can be implemented in various modified and improved embodiments based on the knowledge of those skilled in the art.

[Brief description of the drawings]

FIG. 1 is a front sectional view conceptually showing a configuration of a die casting machine system including a hot water supply device according to an embodiment common to the first and second inventions.

FIG. 2 is a view showing another operation state of the hot water supply apparatus of the embodiment.

FIG. 3 is a view showing still another operation state of the hot water supply apparatus of the embodiment.

FIG. 4 is a flowchart of a program for controlling the operation of the hot water supply device of the embodiment.

FIG. 5 is a conceptual diagram showing a configuration of a computer of the hot water supply apparatus of the embodiment.

FIG. 6 is a diagram conceptually showing a structure of a RAM of the computer.

FIG. 7 is a flowchart of another program for controlling the operation of the water heater of the embodiment.

FIG. 8 is a flowchart of yet another program for controlling the operation of the hot water supply apparatus of the embodiment.

FIG. 9 illustrates a computer program R that executes the program of FIG. 8;
It is a figure which shows the structure of AM conceptually.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Hot-water distribution part 12 Hot-water supply part 14 Die-casting machine 16 Hot-water distribution gutter 20 Connection gutter 22 Holding furnace 24 Pressurizing device 28 Shut-off device 46 Shut-off plug 56 Hot-water outlet 58 Hot-water tap 98 Communication passage 100 Hot-water supply pipe 118 Cavity 124 Injection cylinder

Claims (2)

(57) [Claims] 1. A holding furnace for holding a molten metal, an injection sleeve communicating with a cavity of a die casting machine, a communication passage communicating the injection sleeve with the holding furnace, and
A water heater of a die casting machine including a melt transfer device of a pressurized transferring the molten metal from the holding furnace through the communicating passage to the injection sleeve by supplying pressurized gas, Haiyuro communicating with the holding furnace With less
Both, during the hot water supply period from the holding furnace to the injection sleeve,
A hot water supply device for a die casting machine, comprising a shutoff device for interrupting communication between a holding furnace and a hot water distribution path. 2. A method according to claim 1, wherein a communication hole for communicating the inside of the holding furnace with the outside is provided at a position of the communication path lower than the opening to the holding furnace, and a closing means for closing the communication hole is provided. The hot water supply device according to claim 1.