JP2023158812A - Mold release agent application method to mold and mold release agent application method to mold of casting apparatus - Google Patents

Abstract

To provide a mold release agent application method to molds for stably obtaining a molded article of high quality.SOLUTION: A mold release agent application method to molds 2 is practiced when a mold release agent is applied to a pair of openable molds 2 (3, 4). In this method, when the mold release agent is liquid-sent from a state of being stored in a tank 31 by a pump 32 and is discharged by a spray gun 36a, it is mixed with an atomization air so as to be atomized into a misty shape, thus is applied to the pair of molds 2 (3, 4), and the liquid pressure of the mold release agent when being mixed with the atomization air is made higher than an atmospheric pressure.SELECTED DRAWING: Figure 7

Description

The present invention relates to a method of applying a mold release agent to a mold, and a method of applying a mold release agent to a mold of a casting apparatus.

2. Description of the Related Art Conventionally, a casting apparatus is known that molds a cast product by injecting molten metal into a cavity formed in a pair of openable and closable molds, and cooling and solidifying the molten metal. There are various types of casting equipment of this type, but for example, in Patent Document 1 below, the mold is equipped with a ladle, the molten metal is stored in the ladle, and the mold is molded. A tilting gravity casting device is disclosed that pours molten metal into a mold cavity through a runner when the mold is tilted. The casting method performed using this tilting type gravity casting device has the advantage of being able to obtain high productivity and good product accuracy because the mold can be used repeatedly. Furthermore, in this casting method, the molten metal is not poured at high speed, and the mold can be sufficiently cooled by water. Therefore, the cooling rate can be relatively fast, making it possible to manufacture cast products with excellent mechanical properties by making crystal grains finer.This casting method offers various advantages. There is.

As mentioned above, in the casting method using a tilting gravity casting device, the molds can be used repeatedly, so for example, a pair of molds is opened before and after casting, and powder is poured into the opened molds. The practice was to apply an oil-based mold release agent on the body. By applying an oil-based mold release agent containing powder to the inside surface of the mold, which is the side where the cavity is formed, it is possible to prevent the casting product from adhering to the mold. It can be easily removed.

Japanese Patent Application Publication No. 2013-193099

By the way, in the conventional casting apparatus typified by the above-mentioned Patent Document 1, when applying an oil-based mold release agent containing powder to an open mold, the mold release agent supply path is periodically There were instances where cavities were created where there was no liquid. When such cavities occur, the amount of mold release agent applied is not stable, which may lead to deterioration in the quality of the cast product. In addition, in order to prevent such deterioration of product quality, whenever a cavity without liquid occurs in the mold release agent supply route, a diaphragm pump is connected to the supply route to increase the amount of mold release agent pumped. Production efficiency decreased because the casting machine had to be stopped to eliminate cavities, such as increasing the frequency of the gear pump used to pump the mold release agent to increase the amount of pumping. There was also the issue of doing so. Furthermore, in the prior art, the cause of the phenomenon in which a cavity where there is no liquid in the mold release agent supply path is unknown, and therefore it has not been possible to solve the fundamental problem.

The present invention has been made in view of the problems existing in the prior art described above, and its purpose is to elucidate the cause of the phenomenon in which cavities without liquid occur periodically in the mold release agent supply path. In addition, it is an object of the present invention to provide a method for applying a mold release agent to a mold of a casting apparatus in order to stably obtain high-quality cast products by implementing a fundamental solution. Furthermore, the method of the present invention is applicable to molds other than molds used in casting equipment.

The present invention will be explained below. In order to facilitate understanding of the present invention, reference numbers of the accompanying drawings are added in parentheses, but the present invention is not limited to the illustrated form.

The method for applying a mold release agent to molds according to the present invention is a method performed when applying a mold release agent to a pair of molds that can be opened and closed, and the mold release agent is applied to a tank (31). When the liquid is fed from the stored state by the pump (32) and discharged by the spray gun (36a), it is mixed with atomizing air and sprayed in a mist form to the pair of molds. It is characterized in that the liquid pressure of the mold release agent when mixed with the atomizing air is higher than atmospheric pressure.

A method for applying a mold release agent to a mold of a casting apparatus according to the present invention is to apply a molten metal (M) in a cavity (6) formed in a pair of molds (2 (3, 4)) that can be opened and closed. In a casting device (1) that molds a cast product (C) by injecting and cooling and solidifying the molten metal (M), a mold release process is performed on the pair of opened molds (3, 4). A method carried out when applying a mold release agent, in which the mold release agent is transported from a state stored in a tank (31) by a pump (32) and discharged by a spray gun (36a). , the mold release agent is applied to the pair of molds (3, 4) by being mixed with atomized air and sprayed in a mist form, and the mold release agent is applied when the atomized air is mixed. It is characterized by making the hydraulic pressure of the tank higher than atmospheric pressure.

In the method for applying a mold release agent to a mold according to the present invention, the mold release agent is applied to the mold before the atomized air is mixed with the spray gun (36a) from the tank (31) by the pump (32). It is preferable that the liquid pressure in the liquid feeding path up to the point where the atomizing air is mixed is higher than the liquid pressure of the releasing agent when mixed with the atomizing air.

Furthermore, in the method for applying a mold release agent to a mold according to the present invention, the amount of the mold release agent supplied to the spray gun (36a) and the amount of the mold release agent supplied to the spray gun (36a), and the amount of the mold release agent supplied to the spray gun (36a), By controlling the opening degree of the mold release agent spray of the spray gun (36a) when discharging the mold release agent, the hydraulic pressure of the mold release agent can be increased.

Furthermore, in the method for applying a mold release agent to a mold according to the present invention, the spray gun (36a) is movable by a mobile robot (36b), and the spray gun (36a) is configured to spray the mold release agent in a state in which the atomized air is mixed with the spray gun (36a). When the agent is sprayed from the spray gun (36a) onto the pair of molds (3, 4), the amount of spray can be controlled by controlling the moving speed of the mobile robot (36b) in combination with the waiting time. Adjustments can be made.

According to the present invention, it is possible to provide a method for applying a mold release agent to a mold in order to eliminate the phenomenon in which cavities without liquid occur periodically in the mold release agent supply path, so that stable high quality can be achieved. It becomes possible to obtain molded products.

1 is a diagram showing a vertical cross section of a tilting type gravity casting device according to the present embodiment. FIG. 2 is an external perspective view showing a blocking member included in the tilting gravity casting device according to the present embodiment. FIG. 2 is a diagram showing a state in which the mold is tilted from the state shown in FIG. 1 and the sprue is blocked by a blocking member. FIG. 4 is a diagram showing a state in which the mold is further tilted from the state shown in FIG. 3 and the molten metal is pressurized with a pressure pin. It is a figure which shows the state in which the mold tilting process is completed. FIG. 2 is a schematic diagram showing a schematic configuration of a release agent application mechanism included in the tilting gravity casting apparatus according to the present embodiment. FIG. 2 is a diagram for explaining a method of applying a mold release agent to a mold of a casting apparatus executed in the present embodiment, in which part (a) shows the conventional technique, and part (b) shows the method according to the present embodiment. It shows what was executed. FIG. 2 is a diagram for explaining an example of movement of a mobile robot when applying a method of applying a mold release agent to a mold of a casting apparatus according to the present embodiment; Figure (b) shows the conditions of this embodiment.

Hereinafter, preferred embodiments for carrying out the present invention will be described using the drawings. Note that the following embodiments do not limit the inventions claimed in each claim, and not all combinations of features described in the embodiments are essential to the solution of the invention. .

First, with reference to FIGS. 1 to 5, the basic configuration of a tilting gravity casting apparatus 1 as a casting apparatus to which the method of applying a release agent to a mold of a casting apparatus according to the present invention is applied will be explained. Here, FIG. 1 is a diagram showing a vertical cross section of a tilting type gravity casting apparatus according to this embodiment. Further, FIG. 2 is an external perspective view showing a blocking member included in the tilting type gravity casting apparatus according to the present embodiment. Furthermore, FIG. 3 is a diagram showing a state in which the mold is tilted from the state shown in FIG. 1 and the sprue is blocked by a blocking member, and FIG. 4 is a diagram showing a state in which the mold is further tilted from the state shown in FIG. FIG. 5 is a diagram showing a state in which the mold is being pressurized, and FIG. 5 is a diagram showing a state in which the mold tilting step has been completed.

As shown in FIG. 1, the tilting type gravity casting device 1 according to the present embodiment includes a mold 2 composed of a lower fixed mold 3 and an upper movable mold 4, and a pair of molds A fixed mold 3 and a movable mold 4, which are 2, define a runner 5 and a cavity 6. In the tilting type gravity casting apparatus 1 according to the present embodiment, a runner 5 is defined by the groove 4B formed in the movable mold dividing surface 4A and the fixed mold dividing surface 3A. A ladle 7 is fixed to the fixed mold 3, and a molten metal M such as an aluminum alloy is stored in the ladle 7.

The fixed mold 3 is fixed to the upper surface 8a of the base 8. The lower end of the guide shaft 9 is fixed to the base 8, and the upper end of the guide shaft 9 is fixed to the top plate 10. A hydraulic cylinder 11 is fixed to the upper surface 10a of the top plate 10, and the tip of a cylinder rod 12 passing through the top plate 10 is connected to a movable plate 13 disposed below the top plate 10. When the hydraulic cylinder 11 is driven, the movable plate 13 is guided by the guide shaft 9 and can move between the base 8 and the top plate 10 in the vertical direction in the plane of FIG. A connecting member 14 is provided below the movable plate 13, and the movable plate 13 and the movable mold 4 are connected by this connecting member 14. Therefore, the movable mold 4 is movable together with the movable plate 13 between the base 8 and the top plate 10 in the vertical direction in the plane of FIG.

The tilting type gravity casting device 1 according to this embodiment includes a tilting mechanism (not shown). The tilting mechanism has a known configuration, and includes a tilting shaft (not shown) that is provided on the base 8 and extends in a direction connecting the front and back sides of the paper in FIG. 1, a support arm (not shown) that supports the tilting shaft, and It also includes a tilting drive means (not shown) attached to the support arm. By a tilting mechanism (not shown), the base 8 and the mold 2 are configured to be able to tilt at a predetermined speed in the direction of the arrow shown by the symbol α from the horizontal state shown in FIG. The angle range is approximately 90 degrees.

A hydraulic cylinder 15 is fixed to the upper surface 4a of the movable mold 4. A cylinder rod 16 of the hydraulic cylinder 15 is connected to a blocking member 18 by a coupling 17 within a hole 4b formed in the movable mold 4. As shown in FIG. 2, the blocking member 18 includes a cylindrical head 18a housed within the coupling 17 and a square columnar shaft portion 18b. The blocking member 18 is arranged relatively close to the outlet 5A of the runner 5, and the tip end surface of the shaft portion 18b defines the runner 5 together with the groove 4B of the movable mold 4 and the fixed mold dividing surface 3A. . Further, a recess 3B is formed in the fixed mold 3 at a position facing the tip end surface of the blocking member 18, and this recess 3B is formed in a shape corresponding to the tip end shape of the blocking member 18. When the hydraulic cylinder 15 is driven, the tip surface of the shaft portion 18b enters the runner 5 and fits into the recess 3B formed in the fixed mold 3, thereby blocking the runner 5. It is configured.

A pressurizing hydraulic cylinder 20 is fixed to the lower surface 8b of the base 8 by a support rod 19. The cylinder rod 21 of the pressurizing hydraulic cylinder 20 is connected to a pressurizing pin 23 via a connecting plate 22 . This pressure pin 23 passes through the base 8 and is placed in a hole 3a formed in the fixed mold 3. Since this hole 3a is formed to be electrically conductive to the cavity 6, when the pressurizing hydraulic cylinder 20 is driven, the tip of the pressurizing pin 23 enters into the cavity 6, and the pressurizing pin 23 enters the cavity. It is configured to pressurize the molten metal M in 6.

The mold 2 according to this embodiment is provided with a plurality of ejector pins (not shown), and after the movable mold 4 is separated from the fixed mold 3, the ejector pins (not shown) are used to insert the inside of the runner 5 and into the cavity. The molten metal M solidified in the mold 6 (corresponding to the cast product C in FIG. 5) can be extruded and taken out from the mold 2.

The basic configuration of the tilting type gravity casting apparatus 1 according to the present embodiment has been described above. Next, by adding FIG. 6 to the reference drawings, a release agent application mechanism provided in the tilting type gravity casting apparatus 1 according to the present embodiment will be explained. Here, FIG. 6 is a schematic diagram showing a schematic configuration of a release agent application mechanism included in the tilting type gravity casting apparatus according to the present embodiment.

As shown in FIG. 6, the mold release agent application mechanism 30 included in the tilting type gravity casting apparatus 1 according to the present embodiment includes a tank and a control panel 31. Oil-based mold release agent containing powder is stored.

The oil-based mold release agent containing powder stored in the tank 31 is subjected to pressure by the operation of the gear pump unit 32 and is transported through the path of the mold release agent application mechanism 30 .

An output terminal 33, a pressure sensor 34, and a three-way solenoid valve 35 are arranged along the path from the gear pump unit 32 to the spray gun and mobile robot 36. The output terminal 33 is capable of outputting an analog signal, and for example, the output analog signal can be acquired by a computer (not shown) or the like and used for predicting maintenance of the entire system based on the analog signal data. The pressure sensor 34 can measure the pressure of the oil-based mold release agent containing powder that is fed. Measurement data obtained by the pressure sensor 34 is transmitted to the outside of the system via the output terminal 33, for example, and is used to control the release agent application mechanism 30 and the tilting gravity casting device 1. The three-way solenoid valve 35 is used to branch into two routes the liquid-feeding oil-based mold release agent containing powder. Specifically, the three-way solenoid valve 35 sends liquid to a spray gun 36a provided in a spray gun and a mobile robot 36, or returns excess powder-containing oil-based mold release agent to the tank 31 for reuse. be able to.

The release agent application mechanism 30 according to the present embodiment has been described above with reference to FIG. By the way, in the prior art, when molding a cast product C using the tilting type gravity casting apparatus 1 equipped with the above-mentioned mold release agent application mechanism 30, a cavity where there is no liquid in the mold release agent supply path is periodically removed. An event has occurred, and the cause of the occurrence has not been identified. Therefore, the inventors conducted extensive research in order to identify the cause of the phenomenon in which a cavity where there is no liquid occurs in the mold release agent supply path. For example, in the early stages of research, if we suspect that air is entering the supply route, we may replace the tubes that make up the supply route with new ones, and replace the joints with ones that have better sealing properties. Although measures were taken to improve the equipment, there was no sign of a solution. In addition, the inventors conducted a leak test by pressurizing the supply route as a closed space, but in this case as well, there was no pressure drop, and it was confirmed that there was no leak. Therefore, the inventors became convinced that the cause was not due to the equipment, and conducted laboratory tests to reproduce the on-site conditions. It was confirmed that voids were generated in the liquid. Based on the results of this laboratory test, the inventors deduced that the cause of the phenomenon in which a cavity where there is no liquid in the mold release agent supply path was caused by "dissolved gas." A predetermined amount of gas is dissolved in the mold release agent under atmospheric pressure, and this dissolved gas is called "dissolved gas." When the pressure of dissolved gas decreases or the temperature increases, the amount of saturated dissolved gas decreases and it is no longer able to remain in the liquid, and the dissolved gas turns into gas and enters the air. It has the property of appearing.

Based on the above-mentioned findings, the inventors investigated locations in the release agent application mechanism 30 according to the present embodiment where dissolved gas may turn into gas and come out into the air. , focused on the spray gun 36a. In this spray gun 36a, when applying an oil-based mold release agent containing powder to the mold 2, atomizing air is mixed with the mold release agent discharged by the spray gun 36a, and the mixture is sprayed in a mist form. was being carried out. Then, the inventors confirmed that when atomizing air is added, the pressure of the mold release agent decreases at the same time as the mold release agent is pulled, similar to the principle of an ejector. In other words, the amount of saturated dissolved gas decreases due to the decrease in the pressure of the mold release agent, and the released gas causes a cavity where there is no liquid in the supply path of the mold release agent.

Therefore, the inventors decided to take fundamental measures to prevent the occurrence of cavities. In other words, it is in principle unavoidable that adding atomizing air will pull the mold release agent and cause a drop in fluid pressure. The idea was to prevent the amount from decreasing and eliminate the occurrence of cavities in the supply route. Specifically, the measures taken include increasing the amount of mold release agent supplied to the spray gun 36a, and increasing the liquid pressure by narrowing the needle (opening of the discharge port) of the spray gun 36a. We compensated for the drop in hydraulic pressure caused by the addition of water, and made sure that the hydraulic pressure did not fall below atmospheric pressure. The implementation details of this measure are shown in Figure 7. Here, FIG. 7 is a diagram for explaining the method of applying a mold release agent to the mold of the casting apparatus executed in this embodiment, and the diagram (a) in the figure shows the conventional technique; (b) shows the content executed in this embodiment.

As shown in the diagram (a) in FIG. 7, in the example of the prior art, the supply rate of the oil-based mold release agent containing powder is 1 cc/min, and the needle opening of the spray gun 36a is 1 rotation. The amount of release agent discharged from the spray gun 36a was 0.5 cc/min. In this case, the liquid pressure of the powder-containing oil-based mold release agent before the atomizing air was mixed was greater than atmospheric pressure, but when the powder-containing oil-based mold release agent was mixed with the atomizing air, The liquid pressure of the molding agent is below atmospheric pressure, and the decrease in the amount of saturated dissolved gas has caused the occurrence of cavities in the mold release agent supply path where no liquid exists.

On the other hand, as shown in the diagram (b) in FIG. 7, in this embodiment, the supply amount of the oil-based mold release agent containing powder is 2 cc/min, and the needle opening degree of the spray gun 36a is 0. .5 rotations, and the amount of release agent discharged from the spray gun 36a was 0.5 cc/min. In other words, compared to the conventional technology, the amount of release agent supplied from the spray gun 36a is increased without changing the amount of release agent discharged from the spray gun 36a, and the needle (opening of the discharge port) of the spray gun 36a is throttled to release the liquid. I decided to increase the pressure. When the mold release agent was sprayed from the spray gun 36a under these conditions, the liquid pressure of the powder-containing oil-based mold release agent when mixed with the atomizing air was higher than atmospheric pressure. In addition, in order to achieve this discharge state, the liquid pressure in the liquid feeding path from the tank 31 to before the atomizing air is mixed by the spray gun 36a by the gear pump unit 32 is changed when the atomizing air is mixed. The hydraulic pressure was made to be even greater than that of the oil-based mold release agent containing powder.

When the oil-based mold release agent containing powder was applied to the mold 2 by spraying under the conditions of this embodiment shown in the diagram (b) in FIG. There were no occurrences of this. As a result, stable application of the mold release agent was realized, and the productivity of the tilting type gravity casting apparatus 1 was improved. Moreover, it became possible to stably obtain a high-quality cast product C.

As explained using FIG. 7, the method for applying a mold release agent to the mold of the casting apparatus according to the present embodiment is to control the amount of the mold release agent supplied to the powder-containing oil-based mold release agent supplied to the spray gun 36a. By increasing the amount of oil-based mold release agent containing powder and controlling the opening degree of the mold release agent spray of the spray gun 36a when the spray gun 36a discharges the oil-based mold release agent containing powder. This is to increase the hydraulic pressure. Therefore, in the example shown in FIG. 7, the discharge amount of the mold release agent is the same in the case of the conventional technology and in the case of this embodiment, but there is a possibility that the discharge amount of the mold release agent will increase. There is also. Therefore, by changing the operating conditions of the mobile robot 36b that moves the spray gun 36a, it is possible to adjust the amount of release agent applied to the mold 2. FIG. 8 illustrates driving conditions for such a mobile robot 36b. Here, FIG. 8 is a diagram for explaining an example of movement of a mobile robot when applying a method of applying a mold release agent to a mold of a casting apparatus according to the present embodiment, and FIG. shows the prior art, and part (b) shows the conditions of this embodiment.

In FIG. 8, when the mobile robot 36b moves the spray gun 36a to spray the mold release agent to the mold 2, five points are set for the mold 2, and the process is performed via these five points. The mobile robot 36b is shown operating so that the spraying is performed. Then, by executing the method of the present invention, for example, if the spray amount of the present embodiment is doubled compared to the conventional technique, in the conventional technique, the moving speed of the mobile robot 36b is all 100 mm/s, and point 1 , 3, and 5 was 1 s, and the waiting time at points 2 and 4 was 2 s. On the other hand, in the case of this embodiment in which the spray amount is doubled, the moving speed of the mobile robot 36b is all 200 mm/s, the waiting time at points 1, 3, and 5 is 0.5 s, and the waiting time at point 2 is 200 mm/s. , 4 may be set to 1 s. In other words, when the spray amount in this embodiment is increased by N times, the spray amount can be adjusted by increasing the moving speed and standby time of the mobile robot 36b by 1/N. That is, when the amount of sprayed mold release agent is increased by executing the method of the present invention, it is possible to adjust the amount of sprayed by controlling the moving speed of the mobile robot 36b in combination with the standby time.

Note that the numerical values shown in FIGS. 7 and 8 are for illustration purposes only, and the method of applying a mold release agent to the mold of the casting apparatus according to the present invention is as shown in FIGS. 7 and 8. It is not limited to numerical conditions.

Although the preferred embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the range described in the above embodiments. Various changes or improvements can be made to the above embodiments.

For example, in the embodiment described above, the case where the casting apparatus to which the method of applying a mold release agent to a mold of a casting apparatus is applied is the tilting gravity casting apparatus 1 has been described as an example, but the method of the present invention can also be applied. The casting device is not limited to the tilting type gravity casting device 1. For example, the method of the present invention can be applied to any other casting apparatus that applies a mold release agent to the mold 2, such as a die-casting apparatus for performing a die-casting method.

For example, in the above-described embodiment, the case where the mold release agent to which the method of the present invention is applied is an oil-based mold release agent containing powder, has been explained. As long as the mold release agent has the above-mentioned properties, the same effects as in this embodiment described above can be obtained by applying the method of the present invention regardless of whether or not it contains powder.

For example, in the above-described embodiment, the case where the supply means of the mold release agent to which the method of the present invention is applied is a gear pump has been explained. If it has, the same effects as the above-described present embodiment can be obtained by applying the method of the present invention. In addition, examples of supply means capable of supplying a fixed amount that can be adopted as an alternative to the gear pump according to the present embodiment include a piston pump, a syringe pump, a plunger pump, a diaphragm pump, a screw pump, a mono pump, a tube pump, and a vane pump. It will be done.

Further, for example, in the above-described embodiment, the case where the method of the present invention is applied to the mold 2 used in the casting device (tilting type gravity casting device 1) was illustrated, but the method of the present invention It is also applicable to molds other than those used for. For example, when applying a release agent to any mold such as a mold used for forging, press molding, rubber molding, resin molding, etc., the method for applying a mold release agent to a mold according to the present invention is applied. be able to.

It is clear from the claims that such modifications or improvements may be included within the technical scope of the present invention.

1 Tilting gravity casting device (casting device), 2 Mold, 3 Fixed mold, 3a Hole, 3A Fixed mold dividing surface, 3B Recess, 4 Movable mold, 4a Top surface, 4b Hole, 4A Movable dividing surface, 4B Groove , 5 runner, 5A outlet, 6 cavity, 7 ladle, 7a partition wall, 7b ladle spout, 8 base, 8a top surface, 8b bottom surface, 9 guide shaft, 10 top plate, 10a top surface, 11 hydraulic cylinder, 12 cylinder rod , 13 movable plate, 14 connecting member, 15 hydraulic cylinder, 16 cylinder rod, 17 coupling, 18 blocking member, 18a head, 18b shaft, 19 support rod, 20 pressurizing hydraulic cylinder, 21 cylinder rod, 22 connecting plate , 23 Pressure pin, 30 Release agent application mechanism, 31 Tank and control panel (tank), 32 Gear pump unit (pump), 33 Output terminal, 34 Pressure sensor, 35 3-way solenoid valve, 36 Spray gun and mobile robot ( 36a: spray gun, 36b: mobile robot), M: molten metal, C: cast product.

Claims (5)

A method of applying a mold release agent to a mold, which is performed when applying a mold release agent to a pair of molds that can be opened and closed,
The mold release agent is delivered from a tank by a pump, and when discharged by a spray gun, it is mixed with atomized air and sprayed into a mist, so that it is applied to the pair of molds. It is applied by
A method of applying a mold release agent to a mold, characterized in that the liquid pressure of the mold release agent when mixed with the atomized air is made higher than atmospheric pressure. In a casting device that molds a cast product by injecting molten metal into a cavity formed in a pair of openable and closable molds and cooling and solidifying the molten metal, the pair of molds are opened. A method for applying a mold release agent to a mold of a casting device, which is performed when applying a mold release agent to a mold, the method comprising:
The mold release agent is delivered from a tank by a pump, and when discharged by a spray gun, it is mixed with atomized air and sprayed into a mist, so that it is applied to the pair of molds. It is applied by
A method of applying a mold release agent to a mold of a casting apparatus, characterized in that the liquid pressure of the mold release agent when mixed with the atomized air is made higher than atmospheric pressure. A method of applying a mold release agent to the mold according to claim 1, comprising:
The mold release agent is configured such that the liquid pressure in the liquid feeding path from the tank to the spray gun before the atomization air is mixed with the pump increases the mold release agent when the atomization air is mixed. A method for applying a mold release agent to a mold, characterized in that the pressure is greater than the liquid pressure of the agent. A method of applying a mold release agent to a mold according to claim 1 or 3,
By controlling the amount of the mold release agent supplied to the spray gun and the opening degree of the mold release agent spray of the spray gun when the spray gun discharges the mold release agent, the release agent can be sprayed. A method for applying a mold release agent to a mold, characterized by increasing the liquid pressure of the mold agent. A method of applying a mold release agent to a mold according to claim 4,
The spray gun is movable by a mobile robot,
When the mold release agent is sprayed from the spray gun to the pair of molds in a state where the atomized air is mixed, controlling the moving speed of the mobile robot in combination with a waiting time, A method for applying a mold release agent to a mold, characterized in that the amount of spraying is adjusted.

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