JP2003275855A - Powder release agent application system and casting device - Google Patents

Abstract

(57) [Summary] [Problem] To suppress the occurrence of product defects. SOLUTION: A powder release agent supply machine 3 is connected to a cavity 7 formed by a fixed mold 5 and a movable mold 6 via a release agent supply line 8, and the release agent supply line. A first switch 10 that opens and closes 8 in the vicinity of the cavity 7, an open / closed state detecting unit 27 that detects the open / closed state of the first switch 10,
28, a decompression device 4 connected to the cavity 7 via a decompression line 9, and the decompression line 9
A powder release agent coating system 100 and a casting apparatus, comprising a second switch 12 that opens and closes in the vicinity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder release agent coating system and a casting apparatus.

[0002]

2. Description of the Related Art In die casting, a release agent is indispensable because it is used for the purpose of preventing seizure of a mold and improving the release property of products. Until now, many water-soluble mold release agents containing solid lubricants have been used, but due to their characteristics,
There were problems such as lower productivity, lower quality due to gas entrapment, and environmental deterioration due to release agent scattering. Recently,
In order to solve these problems, without using water as a solvent,
A coating technology for a powder release agent that can be applied in a state where the mold is closed has been developed.

As the prior art, Japanese Patent Laid-Open No. 2001-1707
In Japanese Patent Laid-Open No. 48, a powder release agent is introduced through a powder release agent supply passage arranged at one end in the longitudinal direction of a cavity and exhausted through an discharge passage arranged at the other end. A method for applying a powder release agent is disclosed. In this conventional technique, the supply passage and the discharge passage communicate with respective overflow grooves adjacent to the cavity. Shut-off pins for opening and closing the supply passage and the discharge passage are provided near the overflow grooves of the supply passage and the discharge passage. The supply path is connected to a powder supply device that supplies a powder release agent by compressed air, and the discharge path is connected to a vacuum tank. Thus
According to the conventional technology, it is said that the powder release agent can be applied to the cavity reliably and efficiently.

[0004]

However, in the prior art, shut-off is performed when foreign matter such as burrs enters the sliding portion of the shut-off pin or a hydraulic cylinder that drives the shut-off pin fails. There is a problem that the pin does not open and close at a predetermined timing and the molten metal enters the supply passage and the discharge passage to cause clogging. Therefore, there has been a problem that many defective appearance products are generated without being noticed without a predetermined amount of the powder release agent adhering to the cavity surface. In addition, the air in the cavity cannot be exhausted sufficiently,
There has been a problem that the gas is caught in the product and a defective gas entrapment occurs.

The present invention solves the above problems and provides a powder mold release agent coating system and a casting apparatus capable of suppressing the occurrence of product defects.

[0006]

In order to solve the above technical problems, the technical means taken in claim 1 of the present invention (hereinafter referred to as the first technical means) is a fixed mold. A powder mold release agent supply machine that is in communication with a cavity formed by a movable mold via a mold release agent supply pipeline; and a first switch that opens and closes the mold release agent supply pipeline near the cavity,
An open / closed state detecting means for detecting an open / closed state of the first switch, a pressure reducing device communicated with the cavity via a pressure reducing pipeline, and a second switch for opening / closing the pressure reducing pipeline near the cavity are provided. It is a powder release agent application system characterized by being provided.

The effects of the first technical means are as follows.

That is, since the closed state of the first switch can be detected by the open / closed state detecting means, the casting operation can be interrupted when the first switch does not reach the closed state at a predetermined timing. Can be suppressed. Further, since the open / closed state detecting means can detect the open state of the first switch, the casting operation can be interrupted when the first switch does not reach the open state at a predetermined timing, so that the occurrence of product defects can be suppressed.

In order to solve the above technical problems, the technical means (hereinafter referred to as the second technical means) taken in claim 2 of the present invention is such that the open / closed state detecting means is the first one. The powder mold release according to claim 1, comprising a first detector that detects a fully opened state of the switch and a second detector that detects a fully closed state of the first switch. It is an agent application system.

The effects of the second technical means are as follows.

That is, since the fully open state of the first switch can be detected by the first detector, when the first detector cannot detect the fully open state at a predetermined timing, it can be judged as defective and the casting operation can be interrupted. The occurrence of product defects can be suppressed. Since the second detector can detect the fully closed state of the first switch, when the second detector cannot detect the fully closed state at a predetermined timing, it can be judged as defective and the casting operation can be interrupted. Occurrence can be suppressed.

In order to solve the above technical problem, the technical means taken in claim 3 of the present invention (hereinafter referred to as the third technical means) is a pressure detection for detecting the internal pressure of the cavity. The powder mold release agent application system according to claim 1 or 2, further comprising a container.

The effects of the third technical means are as follows.

That is, since the pressure in the cavity can be detected by the pressure detector, the casting operation can be interrupted when the pressure in the cavity does not fall below the predetermined pressure, so that the unevenness of adhesion of the powder release agent on the cavity surface can be prevented. It is possible to prevent the occurrence of gas entrapment cavities and suppress the occurrence of product defects.

In order to solve the above technical problem, the technical means taken in claim 4 of the present invention (hereinafter referred to as the fourth technical means) is a cyclone type separation in the middle of the decompression pipeline. The powder mold release agent application system according to any one of claims 1 to 3, further comprising a container.

The effects of the fourth technical means are as follows.

That is, since the surplus powder release agent that has entered the pressure reducing pipe can be continuously collected by the cyclone separator without stopping the casting apparatus, the casting cost can be reduced. Moreover, since it is not necessary to replace the filter or the like, the running cost can be reduced. Furthermore, since the passage resistance of air is small and there is no possibility of being clogged with the powder release agent, gas entrapment cavities are not generated, so that the occurrence of product defects can be suppressed.

In order to solve the above technical problems, the technical means taken in claim 5 of the present invention (hereinafter referred to as the fifth technical means) are described in any one of claims 1 to 4. Powder release agent application system, a molten metal injection device for supplying molten metal to a cavity formed by a fixed mold and a movable mold, and immediately before the molten metal is supplied to the cavity and reaches the second switch. The casting device is characterized in that a plunger position detector for detecting the plunger position of the molten metal injection device is provided.

The effects of the fifth technical means are as follows.

That is, since the plunger position detector can close the second switch immediately before the molten metal supplied to the cavity during casting arrives at the second switch,
Since the air in the cavity can be sufficiently removed, the occurrence of gas entrapment cavities can be reduced and the occurrence of product defects can be suppressed.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.
It will be described with reference to the drawings. FIG. 1 is an explanatory diagram of a casting apparatus according to an embodiment of the present invention. This casting apparatus is used for aluminum die casting, and includes a mold 1, a melt injection device 2, a powder release agent coating system 100, a control device 29, and a display device 30.
Etc. are provided. Powder release agent coating system 100
In addition, the powder mold release agent supply machine 3 communicated with the cavity 7 formed by the mold 1 composed of the fixed mold 5 and the movable mold 6 through the mold release agent supply pipe 8, and the mold release agent supply. A first switch 10 for opening and closing the pipeline 8 near the cavity 7, a first switch 10
Detector 27 for detecting the fully open state of the first and second switch 1
Second detector 28 for detecting the fully closed state of 0, cavity 7
The decompression device 4 communicated with the decompression pipe 9, and the second switch 12 for opening and closing the decompression pipe 9 near the cavity 7 are provided.

In this embodiment, the open / close state detecting means for detecting the open / close state of the first switch 10 is constituted by the first detector 27 and the second detector 28. FIG. 2 is a sectional view of the first switch 10. The first switch 10 includes a hydraulic cylinder 10a and a shut pin 10b that slides inside the hydraulic cylinder 10a. The magnetic body portion 1 is provided on the sliding portion 10c of the shut pin 10b.
0d is embedded. The first oil chamber 10f and the second oil chamber 10g inside the hydraulic cylinder 10a are shut off by a seal ring. From the oil port 10h to the first oil chamber 10f, the oil port 1
When the shut pin 10b slides inside the hydraulic cylinder 10a by the hydraulic pressure sent from 0j to the second oil chamber 10g, the release agent supply conduit 8 is opened and closed by the tip 10k of the shut pin 10b.

The first detector 27 and the second detector 28 are provided on the outer peripheral portion of the hydraulic cylinder 10a. First detector 2
Reference numeral 7 denotes a proximity sensor that magnetically detects that the magnetic body portion 10d has come to the opposite position, and detects that the first switch 10 is in the fully opened state. The first detector 28 includes the magnetic body part 10.
The proximity sensor that magnetically detects that d has come to the opposite position detects that the first switch 10 is fully closed.

The second switch 12 is also composed of a hydraulic cylinder and a shut pin similar to the first switch 10, and the tip of the shut pin opens and closes the decompression pipe 9.
No open / closed state detecting means is provided.

The release agent supply pipeline 8 is connected to the cavity 7 at one longitudinal end of the cavity 7, and the decompression pipeline 9 is connected to the cavity 7 at the other longitudinal end of the cavity 7. The decompression pipe line 9 is a discharge line for discharging the powder release agent.

The decompression device 4 is composed of a vacuum pump 21, a vacuum tank 22, and a three-way electromagnetic valve 32 which are connected in this order, and are connected to a decompression pipe 9. The decompression device 4 is for decompressing the inside of the cavity 7 to create a flow of air. In the middle of the depressurizing pipe line 9, excess powder release agent or foreign matter is collected for collecting the powder release agent or foreign matter so that the vacuum pump 21 and the vacuum tank 22 are prevented from malfunctioning. A cyclone separator 26 is provided. FIG. 3 is a sectional view of the cyclone separator 26. The powder mold release agent introduced into the cyclone separator 26 from the inlet 26d is separated into a powder mold release agent 26f having a large specific gravity and air having a small specific gravity in the separating section 26a by the action of centrifugal force. , The powder release agent falls by its own weight and is guided to the discharge port 26b.
The recovery container 26c is accommodated and recovered. On the other hand, the air having a small specific gravity separated by the cyclone separator 26 is sucked by the vacuum pump 21 through the outlet 26e.

A vacuum diaphragm 25 of a stainless steel diaphragm type (electronic type) is provided in the pressure reducing line 9 between the cavity 7 and the cyclone type separator 26. Vacuum sensor 2
Reference numeral 5 is a pressure detector that detects the internal pressure of the cavity 7 when the second switch 12 is in the open state.

The fixed mold 5 is provided with a molten metal injection device 2 for supplying the molten aluminum to the cavity 7. The molten metal injection device 2 is provided with a sleeve 14 that penetrates the fixed mold 5 and a plunger 15 that slides inside the sleeve 14. The molten metal supplied from the molten metal port 16 to the sleeve 14 is provided with a tip 17 of the plunger 15. Press by the runner 18
It is designed to be supplied to the cavity 7 through. The molten metal injection device 2 is provided with limit switches 41 to 43 which are position detectors for detecting the position of the plunger 15. The limit switch 41 is a position detector that detects the forward end of the plunger 15, and the limit switch 43
Is a position detector for detecting the backward end of the plunger 15. The limit switch 42 is a position detector that detects the position of the plunger 15 at the start of the supply of the powder release agent. At the same time, the limit switch 42 is configured such that the molten metal during casting is the second switch 1
2 is a plunger position detector that detects the position of the plunger 15 when the position immediately before 2 is reached. Although not shown, the limit switches 41 to 43 are in contact with the plunger 15 side above the coupling portion 31 of the plunger 15,
A contactor for turning on the limit switches 41 to 43 is provided. After that, the contact of the limit switch with the coupling portion 31 of the plunger 15 means contact with this contactor.

The powder release agent feeder 3 comprises a powder release agent storage section 19 and a powder release agent supply section 20. Figure 4
FIG. 3 is an explanatory diagram of a powder release agent feeder 3. The powder release agent stored in the powder release agent storage portion 19 is the air supply port 1
Air is turned on and off from 9a to send the air to vibrate the lower tank wall 19b made of an elastic material, and sent to the measuring space 20b of the piston 20a provided at the bottom of the powder release agent accommodating portion 19. When the piston 20a is moved forward, the powder release agent is dropped into the supply pipe 20c. At this time, the second pinch valve 20h made of rubber is closed by the air supplied from the air supply port 20g,
The powder release agent is housed in the space 20d. Supply pipe 20
The measuring operation by the piston 20a is repeated until a predetermined amount of the powder release agent is accommodated in the space portion 20d of c. When a predetermined amount of the powder release agent is stored in the space 20d, air is supplied from the air supply port 20e to close the rubber first pinch valve 20f, and the air supplied to the air supply port 20g is turned off. Then, the second pinch valve 20h is opened. In this state, pressurized air is blown from the air supply port 20j to supply the powdery mold release agent to the cavity 7 whose pressure is reduced in advance through the mold release agent supply pipe line 8. The air supply port 20m is for temporarily suspending the powder release agent stored in the powder release agent storage portion 19 and supplying air to help the powder release agent from falling. The air supply port 20n supplies air to completely drop the powder release agent in the measuring space 20b into the supply pipe 20c. The powder release agent is composed of an inorganic powder such as graphite and talc and an organic powder such as wax, resin and metal soap. In the embodiment, the average particle diameter is 25 μm and the bulk specific gravity is 0.28. used.

The control device 29 controls the molten metal injection device 2, the powder release agent feeder 3, the first switch 10, the second switch 12, the vacuum pump 21, and the vacuum sensor via the signal line shown by the dotted line. 25, the first detector 27, the second detector 28, the three-way solenoid valve 32, and the limit switches 41 to 43.
The display 30 displays the control state of the control device 29 and the like.

Next, the operation will be described. 5 and 6 are flow charts for explaining the operation of the casting apparatus of the embodiment. At the time of start, the die 1 is in an open state and the tip 17 of the plunger 15 is stopped at a position on the right side of the hot water inlet 16, that is, the plunger 15 is retracted and the limit switch 43 is turned on.

First, the movable mold 6 is moved to close the mold 1 (S1). Next, the plunger 15 is advanced (S2).
It is determined whether the limit switch 42 is on (S3),
When the limit switch 42 is turned on by coming into contact with the coupling portion 31 of the plunger 15, the plunger 15 is stopped (S4). In this state, as shown in FIG. 7, the tip 17 of the plunger 15 is located in front of the hot water supply port 16 on the ejection side, and the cavity 7 and the hot water supply port 16 are blocked.

Next, the first switch 10 and the second switch 12 are opened and fully opened (S5), and the three-way solenoid valve 32 is set to 32a and 3a.
Switching is performed so that only 2b communicates (S6). It is determined whether the first detector 27 is turned on (S7), and when the first detector 27 is not turned on, the control device 29 sends a signal to the display device 30, sounds a buzzer, lights an abnormal lamp, and The casting cycle is stopped (S30). If the first detector 27 is turned on, it can be determined that the first switch 10 is normally opened, and the vacuum pump 21 is activated to depressurize the cavity 7 (S9). Since the open state of the first switch 10 can be detected by the first detector 27, the first switch 1
Since the casting operation can be interrupted when 0 does not open at a predetermined timing, the first switch 10 does not open sufficiently and the powder mold release agent is not cast with defective application to the cavity surface. The occurrence of defects can be suppressed.

Then, the pressure in the discharge passage 9 is measured by the vacuum sensor 2
5, it is determined whether or not it is below a set value (-0.8 MPa) (S9), and if the pressure is higher than the set value, the control device 29 sends a signal to the display unit 30 and sounds the buzzer. The abnormality lamp is turned on and the casting cycle is stopped (S30). If the pressure is below the set value,
It can be determined that the second switch 12 is normally opened, the second pinch valve 20h of the powder release agent feeder 3 is opened, and the powder release agent is supplied to the cavity 7 where the pressure is reduced. Supply through the pipeline 8 (S10). When the pressure in the cavity does not fall below the predetermined pressure by the vacuum sensor 25, the casting operation can be interrupted, so that the generation of gas entrapment can be prevented,
The occurrence of product defects can be suppressed. Further, the first detector 27 can determine that the first switch 10 is normally opened, and the vacuum sensor 25 can determine that the second switch 12 is normally opened. Since the mold agent supply / discharge path is surely opened and the cavity 7 is surely depressurized, the powder mold releasing agent can be surely attached to the inner surface of the cavity 7.

The surplus powder release agent supplied to the cavity 7 reaches the cyclone separator 26 via the discharge passage 9. The powder release agent contained in the cyclone separator 26 is
Only air is collected in the collection container 26c and is sucked by the vacuum pump 21 through the discharge port 26e. The recovery rate of the powder release agent was 99.5% or more, and almost no powder release agent flowed to the vacuum pump 21 side.

After the supply of the powder release agent is completed, the second pinch valve 20h of the powder release agent feeder 3 is closed, the vacuum pump 21 is stopped, and the first switch 10 is fully closed (S1).
1). Next, it is determined whether or not the second detector 28 is turned on (S12), and when the first detector 28 is not turned on, the control device 29 sends a signal to the display device 30 to sound the buzzer and turn on the abnormal lamp. Then, the casting cycle is stopped (S30). If the first detector 28 is turned on, it can be determined that the first switch 10 is fully closed, and the process proceeds to the casting process. Since the closed state of the first switch can be detected by the first detector 28, the casting operation can be interrupted when the first switch does not reach the closed state at a predetermined timing, so that the cast metal is stored in the first switch. It is possible to prevent the occurrence of abnormal burrs by invading and subsequent supply defects of the powder release agent, and to suppress product defects.

Subsequently, 32a and 32 of the three-way solenoid valve 32
Only c is communicated, the decompression of the cavity 7 is released, and the cavity 7 is communicated with the atmosphere (S13). Next, the plunger 15 is retracted (S14). It is determined whether the limit switch 43 is on (S15), and the plunger 15 is stopped when the limit switch 43 comes into contact with the coupling 31 of the plunger 15 and turns on (S1).
6). In this state, as shown in FIG. 1, the plunger 15 is in a state in which the molten metal port 16 is open and the plunger 15 is in communication with the sleeve 14.

In this state, after the molten aluminum is supplied from the molten metal port 16 to the sleeve 14 (S17), the plunger 15 is moved forward to pass the molten aluminum through the runner 18 into the cavity 7
(S18). It is determined whether the limit switch 42 is on (S19), and when the limit switch 42 is turned on by contacting the coupling 31 of the plunger 15, the second switch 12 is fully closed (S20). The limit switch 42 is turned on when the molten metal reaches just before the second switch 12 during casting, so that the air in the cavity can be sufficiently removed, so that the occurrence of gas entrapment cavities can be reduced and the occurrence of product defects can be suppressed. . Further, the second switch 12 can be fully closed before the molten aluminum enters the second switch 12, and the second switch 12 can be prevented from being clogged with aluminum.

The plunger 15 continues to move forward, and it is judged whether or not the limit switch 41 is on (S21). When the limit switch 41 is turned on by contacting the coupling 31 of the plunger 15, the plunger 15 is stopped ( S22). At this time, the plunger 15 is at the position shown in FIG. 8, and the molten aluminum is completely supplied to the cavity 7. After a predetermined time (a time during which the molten aluminum solidifies) (S23), the movable mold 7 is opened and the cast product is taken out (S24).

Thereafter, the plunger 15 is retracted (S
25). It is determined whether the limit switch 43 is on (S26), and when the limit switch 43 is turned on, the plunger 15 is stopped (S27). This completes one cycle of casting and returns to the starting state.

In the present embodiment, the cyclone separator 26 is provided to separate and collect the powder release agent that has entered the discharge passage 9, but it is not particularly limited, and the powder that has entered the discharge passage 9 is not limited thereto. It suffices that the release agent is separated and only the air can be sucked by the vacuum pump 21. For example, as shown in the explanatory view of the casting apparatus of the modified example of FIG. 9, a back filter type recovery device 40 can be used instead of the cyclone type separator 26. FIG. 10 is an explanatory cross-sectional view of a back filter type recovery device. The back filter type collector 40 has a bag-shaped filter element 40d provided in a housing body 40b having an exhaust port 40f, a housing lid 40a having an intake port 40e attached to the upper side, and a V-band coupling 40c. It is tightened with and integrated. The back filter type collector 40 is provided in the middle of the discharge path 9, the intake port 40e is connected to the cavity 7 side, and the exhaust port 40f is connected to the decompression device 4 side. The air flow containing the powder release agent introduced from the intake port 40e is filtered on the front surface of the filter element 40d and then discharged from the exhaust port 40f. Also in this case, the powder release agent can be collected, but the filter element 40
Since it needs to be replaced each time d is clogged with the powder release agent,
Running cost is uneconomical. Further, when the replacement time of the filter element 40d is delayed, the cavity pressure reducing ability of the pressure reducing device 4 is reduced, and the cavity 7
The air inside cannot be exhausted sufficiently, gas entrapment occurs in the product, and product defects occur. Cyclone separator 26
Generates a downward spiral airflow (centrifugal force) and drops the powder release agent into the lower container by its own weight and airflow, and collects it continuously without stopping the casting device. Therefore, the casting cost can be reduced. Further, since it is not necessary to replace the elements and the like, the running cost can be reduced. In addition, since the passage resistance of air is small and there is no possibility of being clogged with the powder mold release agent, gas entrapment cavities are not generated.

As described above, according to the present invention, by any chance, the sliding of the first switch or the second switch or the molten metal or foreign matter in the supply path and the discharge path gets in, and the powder mold releasing agent is applied to the cavity surface. When a fixed amount cannot be supplied, an abnormal condition is notified and the casting cycle is stopped to prevent occurrence of defective appearance products in advance. In addition, since the air in the cavity can be removed as much as possible, the gas entrapment in the product can be reduced and the product quality can be improved.

In the embodiment, the first detector for detecting the fully open state and the second detector for detecting the fully closed state are used as the open / closed state detecting means of the first switch, but the invention is not particularly limited thereto. Various detection means can be used, such as a method using one detector that detects the position based on the travel distance of light or sound waves. The open / close state detecting means is provided only in the first switch, but may be provided in the second switch. That way, the second
Abnormalities can be detected directly in the switch.

Further, as a plunger position detector for detecting the plunger position when the molten metal reaches immediately before the second switch during casting, and a position detector for detecting the plunger position at the time of starting the supply of the powder release agent, Although the limit switch 42 is used, different detectors may be used. If they are used in common, the number of parts can be reduced, and if separate detectors are used, the degree of freedom in plunger control is increased. Any type of detector can be used as long as it can detect the type of switch and the position of the plunger. Further, although the vacuum sensor is provided on the pressure reducing pipe, it may be provided on another pipe that communicates with the cavity.

Although the aluminum die casting apparatus has been described in the embodiment, a casting apparatus other than the die casting apparatus can also be used.
It can also be used as a casting device for metals other than aluminum, such as magnesium.

[0046]

As described above, according to the present invention, the powder mold release agent supply machine is connected to the cavity formed by the fixed mold and the movable mold via the mold release agent supply pipe, and the mold release agent. A first switch that opens and closes the mold agent supply pipe in the vicinity of the cavity; and an open / closed state detection unit that detects the open / closed state of the first switch.
A decompression device communicating with the cavity via a decompression pipe, and a second decompression device for opening and closing the decompression pipe near the cavity
A powder mold release agent coating system characterized by being provided with a switch or a melt for supplying a metal melt to a cavity formed by a fixed mold and a movable mold. The casting apparatus is provided with an injection device and a plunger position detector that detects the plunger position of the molten metal injection device immediately before the molten metal is supplied to the cavity and reaches the second switch. Therefore, the occurrence of product defects can be suppressed.

[Brief description of drawings]

FIG. 1 is an explanatory view of a casting apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view of a first switch.

FIG. 3 is a sectional view of a cyclone separator.

FIG. 4 is an explanatory diagram of a powder release agent feeder.

FIG. 5 is a flow chart for explaining the operation of the casting apparatus of the embodiment.

FIG. 6 is a flow chart for explaining the operation of the casting apparatus of the embodiment.

FIG. 7 is an explanatory view of the casting apparatus according to the embodiment when decompression is started.

FIG. 8 is an explanatory view at the end of molten metal supply in the casting apparatus of the embodiment.

FIG. 9 is an explanatory view of a casting device of a modified example.

FIG. 10 is an explanatory cross-sectional view of a back filter type recovery device.

[Explanation of symbols]

1 ... Mold 2. Molten metal injection device 3 ... Powder release agent feeder 4 Decompression device 5 ... Fixed mold 6 ... Movable mold 7 ... Cavity 8: Release agent supply pipeline 9 ... Decompression pipeline 10 ... First switch 12 ... Second switch 15 ... Plunger 21 ... Vacuum pump 25 ... Vacuum sensor (pressure detector) 26 ... Cyclone separator 27 ... First detector 28 ... Second detector 42 ... Plunger position detector 100 ... Powder release agent coating system

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Claims (5)

[Claims] 1. A powder mold release agent feeder connected to a cavity formed by a fixed mold and a movable mold via a mold release agent supply line, and the mold release agent supply line near the cavity. A first switch which is opened and closed by a switch, an open / closed state detection means for detecting an open / closed state of the first switch, a pressure reducing device communicated with the cavity via a pressure reducing pipeline, and the pressure reducing pipeline near the cavity. A powder release agent coating system, comprising: a second switch that is opened and closed by the. 2. The open / closed state detecting means comprises a first detector for detecting a fully open state of the first switch, and a second detector for detecting a fully closed state of the first switch. The powder release agent coating system according to claim 1, wherein 3. The powder release agent coating system according to claim 1, further comprising a pressure detector for detecting an internal pressure of the cavity. 4. The powder mold release agent coating system according to claim 1, wherein a cyclone separator is provided in the middle of the pressure reducing line. 5. A powder mold release agent coating system according to claim 1, and a melt injection device for supplying a metal melt to a cavity formed by a fixed mold and a movable mold.
A casting device provided with a plunger position detector for detecting the plunger position of the molten metal injection device immediately before the molten metal is supplied to the cavity and reaches the second switch.