JP2000015418A - Applicator for release agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely recover a release agent by providing a release agent recovering device provided with a second pressure decreasing source for decreasing the pressure of a tank for recovering the release agent and a release agent splashing device having a pressure increasing source communicating with the second pressure decreasing source through a cavity space. SOLUTION: This applicator is composed of a release agent supplying device 29 for supplying the release agent into the cavity space 4, a release agent passage 18 communicating with the supplying device 29, a molten metal supplying device for supplying the molten metal into the cavity space 4, an opening/closing mechanism of communicating hole 17 for communicating the release agent passage 18 with a molten metal supplying passage, the release agent recovering device 24 for recovering the release agent in the cavity space 4, the release agent splashing device 39 for splashing the release agent in the cavity space 4, and an release agent introducing device for introducing the release agent into the cavity space. The release agent applied on the cavity space surface is splashed into the cavity space by pressurizing the cavity space 4 with a pressurizing pump 40, and the splashed release agent is sucked with negative pressure by a vacuum pump 25 and recovered into the tank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold release agent applying apparatus for applying a mold release agent to a cavity space of a mold or the like, and more particularly, to a mold such as casting or die casting which is in a relatively high temperature state. The present invention relates to a release agent applying device for applying a release agent to the cavity space of the above.

[0002]

2. Description of the Related Art Conventionally, as this kind of release agent coating apparatus,
There is one disclosed in Japanese Patent Application Laid-Open No. H6-179046. As shown in FIG. 7, the release agent passage 116 has an upper end connected to the lower part of the cavity 110, a pin 118 p for opening and closing the release agent passage 116, and the release agent passage 11.
6, the liquid release agent is pressure-fed at a predetermined pressure, the pressure of the release agent is released after the pressure-release of the release agent, and the release agent spontaneously flowing out of the release agent passage 116 is collected. Release agent supply / recovery device 120, passages 136 and 146 for opening the upper part of cavity 110 to the atmosphere, and passages 136 and 146.
And an opening / closing mechanism 138p, 148 for opening / closing 46. In addition, 144 is a decompression pump. Then, with the release agent passage 116 opened and the cavity 110 opened to the atmosphere by the passages 136 and 146, the release agent is pressure-fed from the pressure-feeding-side tank 122 of the release agent supply / recovery device 120, and Is filled with a release agent. Also, if the pressure release pressure of the release agent is released by switching the release agent supply / recovery device 120 to the recovery side tank 124, the release agent in the cavity 110 flows out by its own weight, and the inner wall surface of the cavity 110 The release agent is evenly applied.

[0003]

A conventional release agent coating apparatus is configured as described above.

In the above-mentioned conventional release agent coating apparatus, in order to efficiently collect the release agent after the release agent has been applied, it is necessary to increase the size of the recovery section in order to efficiently recover the release agent only by its own weight. It is. Due to this increase in size, the release agent supply / recovery device requires further strength reinforcement. But,
Usually, there is no space at the bottom of the mold to accommodate the size increase of the release agent supply / recovery device.If it is forcibly provided, not only the mold structure becomes complicated, but also the cost increases. Increase significantly. In addition, there is a problem that it is difficult to completely collect the release agent applied to the cavity space only by the own weight of the release agent.

Accordingly, an object of the present invention is to provide a release agent applying apparatus capable of reliably recovering a release agent with a simple configuration in order to solve the above problems.

[0006]

Means for Solving the Problems In order to solve the above technical problem, a technical measure taken in claim 1 is to supply a release agent into a cavity space formed inside a mold. A release agent supply device, a release agent passage communicated with the release agent supply device, and a melt supply means for supplying the melt into the cavity space are formed on a sliding surface of the reciprocating melt supply passage, A communication hole opening / closing mechanism that opens and closes a communication hole that communicates the release agent passage with the molten metal supply passage; and a first low pressure generation that communicates with the release agent supply device via the cavity space and generates a lower pressure than the cavity space. Release agent introducing device, comprising a source, and an opening / closing valve interposed between the cavity space and the first low-pressure generating source and opened when the release agent is introduced from the release agent supply device into the cavity space. And in the cavity space communicating with the release agent passage A release agent recovery tank including a release agent recovery tank for recovering the release agent, a second low pressure source for reducing the pressure in the release agent recovery tank to a pressure lower than the pressure in the cavity space, and a cavity space And a high-pressure generation source that generates a pressure higher than the cavity space through the second low-pressure generation source through the release agent scattering device.

The operation of the above technical means is as follows. That is, the release agent supply device communicates with the release agent passage, and the release agent is supplied to the cavity space formed inside the mold via the release agent passage. Further, in a molten metal supply passage such as a plunger sleeve, a molten metal supply means such as a plunger is disposed so as to be able to reciprocate. ) Is provided with a communication hole for communicating the release agent passage and the molten metal supply passage. Therefore, the release agent enters the molten metal supply passage from the release agent passage via the communication hole, and enters the cavity space from the molten metal supply passage. Then, after the release agent in the release agent supply device is applied to the entire cavity space by the first low pressure source of the release agent introduction device, the release agent in the cavity space is scattered by the high pressure source. The release agent scattered by the second low-pressure source is collected by suction. After collecting the excess release agent in this way, the communication hole is closed by the communication hole opening / closing mechanism. In this state, the melt supply means is driven to inject the melt into the cavity.

According to the first aspect, when the inside of the cavity space is pressurized by the high pressure source, the release agent applied to the surface of the cavity space is scattered in the cavity space. The scattered release agent is sucked at a negative pressure by the second low-pressure source and collected in the collection tank. Therefore, it is possible to reliably collect the release agent in the cavity space.

In order to solve the above-mentioned technical problem, it is preferable to provide a pressure sensor for detecting a pressure in the first communication portion of the release agent recovery tank, as in the technical means of the present invention. In this case, it is possible to detect whether or not the release agent has been completely recovered by detecting the pressure in the first communication portion.

More preferably, as in the technical measures taken in claim 3, the release agent recovery tank has a first communication portion communicating with the release agent passage and a second communication portion communicating with the second low-pressure source.
A communication part, a resistance part arranged in a maze shape so as to provide resistance to the flow from the first communication part to the second communication part in the vicinity of the second communication part, and a resistance part and the first communication part. And a discharge part that is formed between the first communication part and partially blocks the flow of the release agent from the first communication part to the resistance part, and a discharge part that discharges the release agent in the collection tank.

According to this configuration, the release agent introduced into the collection tank strikes the shielding portion, the flow velocity thereof is weakened, and falls under the collection tank by its own weight. However, although the release agent is sucked toward the second communication portion by the negative pressure from the second low pressure generation source, the release agent hardly enters the second communication portion due to the maze-shaped resistance portion. Therefore, most of the release agent collected in the collection tank is discharged from the discharge unit.

More preferably, the discharge portion of the recovery tank communicates with the release agent supply device. In this case, the recovered release agent can be returned to the release agent supply device and used for the next application of the release agent.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view of a casting apparatus equipped with a release agent applying apparatus 1 in this embodiment. The release agent applying device 1 includes a release agent supply device 29 for supplying a release agent into the cavity space 4, a release agent passage 18 communicating with the release agent supply device 29, and the cavity space 4. A molten metal supply device for supplying the molten metal into the inside, a communication hole opening / closing mechanism for opening and closing a communication hole for communicating the release agent passage 18 with the molten metal supply passage, and a release agent recovery for collecting the release agent in the cavity space 4 Equipment and
It comprises a release agent scattering device 39 for scattering the release agent in the cavity space 4 and a release agent introducing device for introducing the release agent into the cavity space.

The components and their peripheral components will be described in detail. The release agent supply device 29 supplies the release agent into the cavity space 4 formed on the opposing surface of the fixed mold 2 and the movable mold 3. The release agent supply device 29 includes a release agent tank 30 in which the release agent is sealed, a fourth conduit 31 communicating with the release agent tank 30, and a one-way interposed in the middle of the fourth conduit 31. And a valve 32. This one-way valve 32 allows only the fluid from the release agent tank 30
Shut off fluid to.

The release agent supply device 29 further includes a release agent fixed-rate pump 33. The release agent fixed-quantity pump 33 includes a cylinder portion 33a, a piston portion 33b, and a piston driving portion 3.
3c. The piston part 33b reciprocates in the cylinder part 33a by driving the piston driving part 33c, whereby the scavenging volume in the cylinder part 33a changes and the release agent that enters the cylinder part 33a is sent out. Further, the scavenging space of the cylinder 33a is connected to the fifth conduit 3
The fifth conduit 34 joins the fourth conduit 31 at the junction D shown in the drawing. The junction C and the junction D are communicated by a sixth conduit 35, and a release agent supply opening / closing valve 36 is provided in the middle of the sixth conduit 35.

The molten metal supply device 29 will be described. The molten metal supply device includes a molten metal supply means and a molten metal supply passage in which the molten metal supply means reciprocates. In the present embodiment, a cylindrical plunger sleeve (hereinafter, referred to as a sleeve) 1 that forms a part of a casting device is provided in the fixed mold 2.
5 is embedded, and the internal space of the sleeve 15 is
It communicates with the lower part of the cavity space 4. Further, a plunger 16 is disposed in the internal space of the sleeve 15, and the plunger 16 can reciprocate in the sleeve 15. Also, the side of the sleeve 15
A communication hole 17 is formed in a portion where the plunger 16 slides back and forth. A release agent passage 18 is further connected to the communication hole 17. The sleeve 15 and its internal space correspond to the melt supply passage in the present invention, and the plunger 16 corresponds to the melt supply means in the present invention.

FIG. 3 shows details of the vicinity of the release agent passage 18. In FIG. 3, the release agent passage 18 is formed as a substantially cylindrical passage, and a second cylinder 19 is disposed at a lower portion in the drawing. The second cylinder 19 is connected to a second opening / closing pin 20, and the operation of the second cylinder 19 causes the second opening / closing pin 20 to expand and contract in the vertical direction in FIG.
7 can be opened and closed. Also, the release agent passage 1
8, a hole 21 is formed at the lower right of the figure, and the hole 21 communicates with the second conduit 22. The other end of the second conduit 22 has a release agent recovery device 24 and a release agent supply device 2 described later.
9 are in communication. In this case, the second opening / closing pin 2
0 corresponds to the communication hole opening / closing mechanism in the present invention.

The release agent introducing device 38 communicates with the release agent supply device 29 through the cavity space 4 and is a first vacuum pump which is a first low pressure generating source for generating a pressure lower than that of the cavity space 4. 14, a first vacuum tank 13 connected to the first vacuum pump 14, and a conduit 10b communicating with the first vacuum tank 13, and interposed between the cavity space 4 and the first vacuum pump 14. And an on-off valve 12 that is opened when the release agent is introduced from the release agent supply device 29 into the cavity space 4.

The release agent recovery device 24 has a second vacuum tank 26 which is a release agent recovery tank for recovering the release agent in the cavity 4, and controls the pressure in the second vacuum tank 26 to the cavity. A second vacuum pump 25 serving as a second low-pressure generating source for lowering the pressure in the space 4, a second vacuum tank 26 connected to the second vacuum pump 25, and a communication with the second vacuum tank 26. It comprises a third conduit 27. Third conduit 2
Reference numeral 7 has a release agent recovery opening / closing valve 28 interposed in the middle thereof, and merges with the second conduit 22 at a junction C shown in the drawing. The release agent collecting on-off valve 28 is an on-off valve that opens when collecting the release agent from the cavity space 4 as described later.

The release agent scattering device 39 communicates with the second low-pressure source 25 via the cavity space 4, and generates a high-pressure source 40 which generates a higher pressure than the cavity space 4.
Is provided. The release agent scattering device 39 includes a pressure pump 40 as a high-pressure source and a conduit 10 d communicating with the pressure pump 40.
And The conduit 10d has a release agent pressurizing opening / closing valve 42 interposed in the middle thereof, and the conduit 10a
Has joined.

As shown in FIG. 2 in detail, a first passage 5, a second passage 6 communicating with the first passage 5, and a second passage 6 communicating with the second passage 6 are shown in the upper part of the cavity space 4 in the drawing. Three passages 9 are formed. A first opening / closing pin 7 is provided in the second passage 6.
The first opening / closing pin 7 can be extended and contracted in the second passage 6 by the first cylinder 8. Therefore, when the first opening / closing pin 7 extends rightward in the figure by the operation of the first cylinder 8, the first opening / closing pin 7 fills the space in the second passage 6, and the first passage 5 and the third passage 90 are separated from each other. Set to the cutoff state. The third passage 9 opens to the outside of the fixed mold 2 and communicates from this opening to a first conduit 10 located outside the mold. It has branched. One of the conduits 10a branched at the branch point A further branches at the illustrated branch point B on the way, and the other conduit 10b communicates with the first vacuum tank 13 via the second on-off valve 12, and The vacuum tank 13 is connected to the first vacuum pump by 14
It is connected to. One of the conduits branched at the branch point B is the first conduit.
The other conduit 10d is open to the atmosphere through an on-off valve 11, and the other conduit 10d is connected to a pressurizing pump 4 via an on-off valve 42 for pressurizing the release agent.
It communicates with 0. The second on-off valve 12 is an on-off valve that opens when supplying the release agent into the cavity 4 as described later.

The operation of the release agent coating apparatus 1 having the above configuration will be described below.

First, mold clamping is performed by mold driving means (not shown). At this time, the position of the plunger 16 is as shown in FIG. 1, that is, a position where the communication hole 17 communicates with the cavity space 4. Also, at this time, the second opening / closing pin 20 extends upward to extend through the communication hole 17.
The first opening / closing pin 7 extends to the right to shield the first passage 5 and the third passage 9, and the first opening / closing valve 11, the second opening / closing valve 12, and the release agent recovery Open / close valve 28 and release agent supply open / close valve 36 are both closed. Note that the first vacuum pump 14 and the second vacuum pump 25 are constantly driven, so that the first vacuum tank 13 and the second vacuum tank 2
6 is always in a reduced pressure state.

Next, the second cylinder 19 is driven, and the second cylinder 19 is driven.
The opening / closing pin 20 is lowered. As a result, the communication hole 17 is opened, and the release agent passage 18 and the cavity space 4 are in communication with each other.

Next, in the release agent supply step 25, the piston drive unit 33c of the release agent constant-quantity feeder 33 is operated to move the piston unit 33b rightward in the figure. As a result, the scavenging space of the cylinder portion 33a is depressurized and becomes lower than the pressure of the release agent tank 30. Therefore, the one-way valve 32
Is opened, and the release agent in the release agent tank 27 is
The fluid flows into the scavenging space of the cylinder 33a via the one-way valve 32, the junction D, and the fifth conduit 34. At this time, by setting the amount of movement of the piston portion 33b to a constant value, the amount of release agent supplied each time can be constant.

When a predetermined amount of the release agent enters the scavenging space of the cylinder portion 33a, the release agent supply opening / closing valve 36 is opened,
The piston part 33b is moved leftward in the figure by the piston driving part 33c. Almost simultaneously with this, the first opening / closing pin 7
Is moved to the left in the drawing to make the first passage 5 and the third passage 9 communicate with each other, and the second on-off valve 12 is opened. Thereby, the scavenging space in the cylinder portion 33a and the cavity space 4 are in communication with each other.
The release agent in the scavenging space 3a is supplied to the fifth conduit 34, the junction D, the sixth conduit 35, the release agent supply opening / closing valve 36, the junction C, the second conduit 22, the hole 21, the release agent passage. 18, communication hole 1
7, cavity space 4 through space in sleeve 15
Invade. When the mold release agent enters the cavity 4, the heat of the mold causes the mold release agent to evaporate and generate steam. This steam passes through the second passage 6 opened from the first passage 5 by the operation of the first opening / closing pin, and further from the second passage 6 to the third passage 9, the first conduit 10, the branch point A, and the second opening / closing valve 12. Through,
It enters the vacuum tank 13. Thus, the vapor in the cavity 4 generated by the application of the release agent is removed.

When a predetermined amount of the release agent enters the cavity space 4, the second on-off valve 12 is closed and the first on-off valve 12 is closed.
The on-off valve 11 is opened, and the cavity space 4 is opened to the atmosphere. Thereafter, the release agent supply on-off valve 36 and the first on-off valve 11 are closed, and the release agent recovery on-off valve 28 and the release agent pressurization on-off valve 42 are open.
Thereby, the pressurized pump pre-pressurized and the cavity space 4, and the cavity space 4 and the pre-pressurized second vacuum tank 26 are brought into communication with each other. The release agent remaining on the surface of the cavity space 4 is scattered in the cavity space by the pressure pump. The scattered release agent is applied to the sleeve 1
5, communication hole 17, release agent passage 18, second conduit 2
2. The liquid is collected in the second vacuum tank 26 by the negative pressure of the second vacuum pump 26 via the junction C and the release agent collection opening / closing valve 28.

After a lapse of a predetermined time from the collection of the release agent, the first cylinder 8 is driven, and the first opening / closing pin 7 is moved rightward in the drawing to cut off the communication between the first passage 5 and the third passage 9.
As a result, the inside of the cavity space 4 is decompressed from the open-to-atmosphere state, the saturated vapor pressure of water is reduced, the water remaining in the cavity space 4 evaporates, and the inside of the cavity space 4 is dried. I do.

After drying the inside of the cavity space 4 for a predetermined time, the second cylinder 19 is driven to
0 is moved upward in the figure. As a result, the communication hole 17 is closed, and the cavity space 4 is cut off from the release agent passage 18. In this state, the cavity space 4 is in a closed state.

After the interior of the cavity space 4 is sealed, the plunger 16 is retracted, and the molten metal is supplied from the pouring port 37 into the sleeve 15. When the pouring is completed, the plunger 16 is advanced to inject the molten metal into the cavity 4.

Plunger 1 when injection of molten metal is completed
The position 6 is a position as shown in FIG. As is clear from FIG. 4, the communication hole 17 is covered by the plunger 16. For this reason, the casting pressure generated after the completion of the filling of the molten metal is not transmitted to the communication hole 17, and therefore is not transmitted to the second opening / closing pin 20 closing the communication hole 17. For this reason, it is not necessary to consider the pressure resistance enough to withstand the casting pressure in designing these mechanisms, so that a simple and inexpensive configuration can be achieved. During the injection of the molten metal, the back pressure of the molten metal is applied. This back pressure is about one-tenth of the casting pressure applied when the filling is completed. Will not be.

The recovery of the release agent in the second vacuum tank 26 will be described in detail with reference to FIG. FIG. 5 is a sectional view of the second vacuum tank 26. The second vacuum tank 26 is provided with a third conduit 27 serving as a first communication portion communicating with the release agent passage 18.
A second communication portion 48 communicating with the second vacuum pump 25;
In the vicinity of the second communication part 48, the second communication part 2
8, the resistance portions 45 and 46, which are arranged in a maze shape so as to provide resistance to the flow to the flow path 8, and the resistance portions 45 and 46 and the third conduit 2.
7 and the resistance portions 45, 4
A shielding portion 44 for partially blocking the flow of the release agent to
A discharge section 47 for discharging the release agent in the vacuum tank 26 to the release agent recovery tank 49 via the opening / closing valve 43;
A pressure sensor 41 for detecting the pressure in the second vacuum tank 27 is mounted in the middle of the three conduits 27. Further, an on-off valve 50 is provided between the second vacuum pump 25 and the second vacuum tank 26 so that the two can be communicated with each other and can be switched off, and the second communication portion 48 is connected to the atmosphere via an on-off valve 51. Communicating.

When the release agent is collected, the on-off valves 43 and 51 are closed and the on-off valve 50 is open. Second vacuum pump 25
The release agent is introduced from the third conduit 27 due to the pressure difference between the negative pressure of the negative pressure and the pressurization by the pressure pump 40, and the release agent is simultaneously introduced into the second vacuum tank 25 and is This reduces the flow velocity. Most of the release agent that has hit the shielding portion 44 falls under the second vacuum tank 25 by its own weight and is stored. At this time, a part of the release agent is sucked by the second vacuum pump 26 toward the second communication part 48, but the resistance part 45,
Since the flow is blocked by 46, there is almost no release agent flowing to the second vacuum pump 26 through the second communication portion 48. Therefore, most of the collected release agent is stored in the second vacuum tank 25. When the collection of the release agent is completed, the on-off valve 43,
Open 51 to release agent supply device 29 and second vacuum tank 26
And the on-off valve 50 is closed, and the pump 5
2 is driven to send out the collected release agent into the release agent supply device 29. This release agent is used again at the next application of the release agent.

FIG. 6 shows the relationship between the detection value of the pressure sensor 41 and time. The pressure sensor 41 is connected to the first communication portion (third conduit) 27
By detecting the internal pressure, it is detected whether or not the release agent has been recovered. A negative pressure of -0.9 kg / m ² is previously generated by the second vacuum pump 25, and the on-off valve 28 is opened to start collecting the release agent. The release agent scattered by the pressurization of the pressure pump 40 is applied to the pressure sensor 4 of the first communication portion 27.
1, the communication between the second vacuum pump 25 and the pressurizing pump 40 is momentarily interrupted, and the pressurizing pump 4
Since only the pressure due to 0 is detected, the detected value is the highest. However, since the release agent that has hit the shielding portion 44 is stored below the second vacuum tank 26, the first communication portion 27
Immediately communicate with vacuum tank. Therefore, the detection value of the pressure sensor 41 becomes low again. The detection value of the pressure sensor 41 is −0.4 kg / m ² , that is, the pressure of the pressure pump 40 is 0.5 kg / m ² and the pressure of the second vacuum pump 25 is −0.9 kg / m ² .
When the pressure difference reaches kg / m ² , it is recognized that the recovery of the release agent has been completed.

As described above, by attaching the pressure sensor 41, the recovery of the release agent can be reliably recognized, and the recovery accuracy of the release agent is improved.

[0037]

According to the first aspect, by pressurizing the cavity space with the high-pressure source, the release agent applied on the surface of the cavity space is scattered in the cavity space. The scattered release agent is sucked at a negative pressure by the second low-pressure source and collected in the collection tank. Therefore, it is possible to reliably collect the release agent in the cavity space.

According to the second aspect, by detecting the pressure in the first communication portion, it is possible to detect whether or not the recovery of the release agent has been completely completed, thereby improving the recovery accuracy of the release agent. I do.

According to the third aspect, the release agent introduced into the recovery tank hits the shielding portion, the flow velocity thereof is weakened, and the release agent falls below the recovery tank by its own weight. However, although the release agent is sucked toward the second communication portion by the negative pressure from the second low pressure generation source, the release agent hardly enters the second communication portion due to the maze-shaped resistance portion. Therefore, most of the release agent collected in the collection tank is discharged from the discharge unit.

According to the fourth aspect, the recovered release agent can be returned to the release agent supply device and used for the next application of the release agent.

[Brief description of the drawings]

FIG. 1 is a schematic partial cross-sectional view of a release agent applying device according to an embodiment of the present invention.

FIG. 2 is a detailed view of the vicinity of a first opening / closing pin in the embodiment of the present invention.

FIG. 3 is a detailed view around a second opening / closing pin in the embodiment of the present invention.

FIG. 4 is a diagram showing a position of a plunger when filling of a molten metal in a casting apparatus according to an embodiment of the present invention is completed.

FIG. 5 is a sectional view of a second vacuum tank.

FIG. 6 is a graph showing a relationship between a detection value of a pressure sensor and time.

FIG. 7 is a schematic view of a release agent application device according to the prior art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Release agent coating device 2 ... Fixed mold 3 ... Movable mold 4 ... Cavity space 5 ... 1st passage 6 ... 2nd passage 7 ... 1st Opening / closing pin 8 1st cylinder 9 3rd passage 10 1st
Conduit 11 ... first on-off valve 12 ... second
On-off valve 13 ... first vacuum tank 14 ... first
Vacuum pump 15 ・ ・ ・ Plunger sleeve (sleeve) 16 ・ ・ ・ Plunger 17 ・ ・ ・ Communication hole 18 ・ ・ ・ Release agent passage 19 ・ ・ ・ Second
Cylinder 20: second opening / closing pin 22: second
Conduit 23 ... Release agent supply / recovery mechanism 24 ... Release agent recovery device 25 ... Second vacuum pump 26 ... Second
Vacuum tank 27 ... third conduit (first communication part) 28 ... release agent recovery on-off valve 29 ... release agent supply device 30 ... release agent tank 31 ... fourth conduit 32 ... one-way valve 33 ... release agent low-pressure pump 34 ... 5th
Conduit 35 ... sixth conduit 36 ... release agent supply on-off valve 38 ... release agent introduction device 39 ... release agent scattering device 40 ... pressurizing pump 42 ... release Opening / closing valve for pressurizing agent 41 ・ ・ ・ Pressure sensor 44 ・ ・ ・ Shielding part 45, 46 ・ ・ ・ Resistance part 47 ・ ・ ・ Discharge part 48 ・ ・ ・ Second communication part 49 ・ ・ ・ Release agent recovery tank

Claims (4)

[Claims] A mold release agent supply device for supplying a mold release agent into a cavity formed in a mold; a mold release agent passage communicated with the mold release agent supply device; A communication hole opening / closing mechanism formed on a sliding surface of a reciprocating molten metal supply passage for supplying the molten metal into the tee space and for opening and closing a communication hole for communicating the release agent passage with the molten metal supply passage; A first low-pressure source that communicates with the release agent supply device through the cavity space to generate a lower pressure than the cavity space, and is interposed between the cavity space and the first low-pressure source A release agent introduction device having an opening / closing valve that opens when the release agent is introduced from the release agent supply device into the cavity space; and a release agent in the cavity space that communicates with the release agent passage. Release agent recovery tank for recovering the release agent and the release agent A mold release agent recovery device having a second low-pressure source for reducing the pressure in the agent recovery tank to a pressure lower than the pressure in the cavity space; and a cabinet communicating with the second low-pressure source via the cavity space. A release agent scattering device including a high-pressure generation source that generates a pressure higher than the tee space. 2. The release agent applying device according to claim 1, wherein the release agent recovery device includes a pressure sensor for detecting a pressure in a first communication portion of the release agent recovery tank. 3. The release agent recovery tank according to claim 1, wherein the release agent recovery tank includes a first communication portion communicating with the release agent passage, a second communication portion communicating with a second low-pressure source, and a vicinity of the second communication portion. A resistance portion arranged in a maze shape so as to provide resistance to the flow from the first communication portion to the second communication portion, and a first portion formed between the resistance portion and the first communication portion. A release agent application device, comprising: a shielding portion that partially blocks flow of the release agent from the communication portion to the resistance portion; and a discharge portion that discharges the release agent in the collection tank. 4. The release agent applying device according to claim 3, wherein the discharge portion of the recovery tank communicates with the release agent supply device.