JP2020082133A - Release agent coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold release agent application device capable of efficiently applying a mold release agent to a mold with simple control. SOLUTION: A mold release agent coating device 1 according to the present invention sprays a mold release agent 3 while moving between a pair of molds 2 to apply a mold release agent 3 to a surface 21 of the pair of molds 2. A first mold release agent coating device 1 to be coated, wherein a movable unit 11 that can move between a pair of molds 2 and a first mold release agent 3 that is fixed to the movable unit 11 in a direction that allows injection of the mold release agent 3 diagonally downward. Nozzle 12 and a second nozzle 13 fixed to the movable unit 11 in a direction capable of injecting the release agent 3 diagonally upward. [Selection diagram] Fig. 1

Description

The present invention relates to a release agent applying device.

In die casting, a method is known in which a mold release agent is applied to the inner surface of a mold in advance to prevent welding between the mold and a cast product. Specifically, for example, a method is known in which a mold release agent is sprayed onto the inner surface of a die casting mold using a nozzle to form a film of the mold release agent on the surface of the mold.

Here, in order to more reliably separate the cast product from the mold, it is necessary to uniformly apply a sufficient amount of the release agent to the surface of the mold. In order to achieve such an object, for example, as shown in FIG. 5, a method of applying a sufficient amount of release agent to the surface of the mold by moving the nozzle in accordance with the shape of the unevenness of the mold. It has been known. Further, Patent Document 1 discloses a release agent coating device that can uniformly apply a release agent regardless of the types of molds by independently controlling the ejection states of a plurality of nozzle devices.

JP, 2007-237217, A

The method of moving the nozzle as shown in FIG. 5 has a problem that the control of the nozzle becomes complicated because the path of the nozzle is complicated. Further, also in the device of Patent Document 1, there is a problem that the processing becomes complicated because the injection conditions such as the injection direction of each nozzle, the injection position, and the flow rate of the release agent are independently controlled.

The present invention has been made in order to solve such a problem, and provides a release agent coating device capable of efficiently applying a release agent to a mold with simple control.

The mold release agent coating device according to the present invention is a mold release agent coating device that applies the mold release agent to the surfaces of the pair of molds by spraying the mold release agent while moving between the pair of molds. There is a movable unit movable between the pair of molds, a first nozzle fixed to the movable unit in a direction in which the mold release agent can be sprayed obliquely downward, and the mold release agent And a second nozzle fixed to the movable unit in a direction capable of ejecting upward.

According to the above configuration, the release agent applying device according to the present invention includes the movable unit, the first nozzle fixed to the movable unit, and the second nozzle. Further, the first nozzle can inject the release agent obliquely downward, and the second nozzle can inject the release agent obliquely upward.
Here, the first nozzle capable of injecting obliquely downward can efficiently apply the release agent to the lower surface of the concave portion and the upper surface of the convex portion in the mold. In addition, the second nozzle capable of spraying obliquely upward can efficiently apply the release agent to the upper surface of the concave portion and the lower surface of the convex portion in the mold.
Therefore, for example, the mold release agent can be efficiently applied to the surface of the mold even by moving the movable unit in one direction while fixing the position and flow rate of each nozzle. That is, according to the above configuration, the mold release agent can be efficiently applied to the mold with simple control.

According to the present invention, it is possible to provide a release agent coating device capable of efficiently applying a release agent to a mold with simple control.

It is a schematic diagram showing the structure of the release agent coating device which concerns on this embodiment. It is a schematic cross section showing a mode that a mold release agent is applied to a metallic mold using the mold release agent application device concerning this embodiment. 6 is a table showing an example of suitable coating conditions when a release agent is applied using the release agent applying apparatus according to the present embodiment. It is a graph showing the amount of release agent 3 applied per unit area per unit time at each point on the surface of the mold. It is an example of the coating method in the conventional release agent coating device.

Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. Further, the following description and drawings are simplified as appropriate for the sake of clarity. In addition, a plurality of configuration examples described below can be implemented independently or can be implemented in an appropriate combination. These plural configuration examples have new features different from each other. Therefore, the plurality of configuration examples contribute to solving different purposes or problems and contribute to different effects.
It should be noted that the right-handed xyz coordinates shown in FIG. 1 and other drawings are, of course, convenient for explaining the positional relationship of the components. Usually, the positive direction of the z-axis is the vertical direction and the xy plane is the horizontal plane, which is common between the drawings.

[Structure of Release Agent Coating Device 1]
First, the overall configuration of the release agent applying apparatus 1 according to this embodiment will be described with reference to FIG. FIG. 1 is a schematic plan view of the release agent applying apparatus 1 according to the present embodiment as seen from the front (x-axis positive direction). In the present embodiment, the configuration when the release agent coating device 1 is viewed from the rear (x-axis negative direction) is the configuration when the release agent application device 1 is viewed from the front (x-axis positive direction). Since it is the same as, the description will be omitted.

The mold release agent application device 1 is a device that sprays the mold release agent while moving between the pair of molds to apply the mold release agent to the surfaces of the pair of molds.
As shown in FIG. 1, the release agent coating device 1 according to the present embodiment includes a control unit 10, a movable unit 11, a first nozzle 12, a second nozzle 13, and an air blow device 14. Prepare

The control unit 10 is, for example, a CPU (Central Processing Unit), and controls the operation of each unit of the release agent coating device 1 based on a program stored in advance. The control unit 10 is electrically connected to each unit that controls itself.

The movable unit 11 is a frame body that fixes and supports a first nozzle 12, a second nozzle 13, and an air blow device 14, which will be described later. As shown in FIG. 1, the movable unit 11 includes an upper frame 11a, a pair of vertical frames 11b facing each other, and a pair of horizontal frames 11c facing each other. The movable unit 11 is formed so as to be movable between a pair of molds, and is a member that supports a nozzle or the like. Therefore, it is preferable that the movable unit 11 be formed of a solid member such as metal.

The upper frame 11a is a plate-shaped member extending in the x-axis direction and the y-axis direction. The pair of vertical frames 11b are rod-shaped members, respectively, and are provided so as to extend vertically downward (z-axis negative direction) from the lower surface (the surface on the z-axis negative direction side) of the upper frame 11a. The pair of horizontal frames 11c are rod-shaped members and are provided so as to extend in the left-right direction (y-axis direction).

A plurality of mounting holes 111 are arranged in the vertical frame 11b and the horizontal frame 11c so as to be aligned in the respective longitudinal directions. The vertical frame 11b and the horizontal frame 11c are fixed by tightening bolts and nuts (not shown) from both outer sides of the mounting holes 111 of each other. The position of the horizontal frame 11c in the vertical direction (z-axis direction) can be arbitrarily adjusted according to the position of the mounting hole 111.

The 1st nozzle 12 and the 2nd nozzle 13 are nozzles which can inject the mold release agent supplied via the piping etc. which are not shown in figure. The first nozzle 12 and the second nozzle 13 can be, for example, two-fluid nozzles capable of spraying a release agent on an air flow.

The first nozzle 12 is a nozzle fixed to the movable unit 11 in a direction in which the release agent can be sprayed obliquely downward. For example, the first nozzle 12 is a nozzle fixed in a direction in which the mold release agent can be sprayed in a direction above the horizontal surface by 30°. In the present embodiment, the first nozzle 12 is attached to the attachment hole 111 of the horizontal frame 11c on the upper side (the positive side of the z-axis) of the pair of horizontal frames 11c.

The second nozzle 13 is a nozzle fixed to the movable unit 11 in a direction in which the release agent can be sprayed obliquely upward. For example, the second nozzle 13 is a nozzle that is fixed in a direction in which the release agent can be jetted downward from the horizontal surface by 30°. In the present embodiment, the second nozzle 13 is attached to the attachment hole 111 of the lower (z-axis negative side) horizontal frame 11c of the pair of horizontal frames 11c.

The mounting positions and angles of the first nozzle 12 and the second nozzle 13 can be appropriately adjusted according to the shape of the mold. Further, the mounting angles of the first nozzles 12 and the second nozzles 13 may be different from each other.

The air blow device 14 is a device capable of injecting air supplied via a pipe or the like (not shown). The air blow device 14 includes a main body 141 and an air outlet 142 provided on the front surface of the main body 141, and air is ejected from the air outlet 142. The air blow device 14 can be attached to any position of the movable unit 11 as long as the air outlet 142 faces the mold. In the example of FIG. 1, the air blow device 14 is attached to the attachment hole 111 of the vertical frame 11b.

[Operation of Release Agent Coating Device 1]
Next, the operation of the release agent coating device 1 will be described with reference to FIG. In the present embodiment, an example will be described in which the release agent applying apparatus 1 injects the release agent 3 toward the surfaces 21 of the pair of molds 2 and then injects the air 4. FIG. 2A is a schematic cross-sectional view for explaining the operation of injecting the release agent 3 toward the surfaces 21 of the pair of molds 2. FIG. 2B is a schematic cross-sectional view for explaining the operation of injecting the air 4 toward the surfaces 21 of the pair of molds 2.

The pair of molds 2 are molds used in die casting and the like, and are provided so as to face each other in the x-axis direction. The surface 21 of the pair of molds 2 is provided with an uneven shape, and the mold 2 is closed during casting. By pouring the molten metal into the mold 2 in the closed state, a cast product conforming to the uneven shape of the surface 21 of the mold 2 is manufactured.
The release agent 3 is a chemical agent applied to prevent the die 2 and the casting product from welding. As the release agent 3, for example, a water-soluble release agent in which particles of fats and oils, silicon, graphite and the like are dispersed in water, or an oil-based release agent in which the particles are dispersed in an organic solvent is used.

As shown in FIG. 2A, during injection of the release agent 3, the movable unit 11 moves from above to below between the pair of molds 2, and the first nozzle 12 and the second nozzle 12 are moved. 13 injects the release agent 3.
At this time, the first nozzle 12 sprays the release agent 3 obliquely downward, and the second nozzle 13 sprays the release agent obliquely upward. The first nozzle 12 that can be sprayed obliquely downward can efficiently apply the release agent 3 to the lower surface of the concave portion and the upper surface of the convex portion on the surface 21 of the mold 2. Further, the second nozzle 13 that can be sprayed obliquely upward can efficiently apply the release agent 3 to the upper surface of the concave portion and the lower surface of the convex portion on the surface 21 of the mold 2.
Therefore, even if the movable unit 11 is only moved from the upper side to the lower side while the positions and flow rates of the first nozzle 12 and the second nozzle 13 are fixed, the release agent is efficiently applied to the surface of the mold. be able to. That is, the mold release agent can be efficiently applied to the mold by simple control.

After the mold release agent 3 is sprayed to the lower part of the surface 21 of the mold 2, the mold release agent application apparatus 1 moves upward from below between the pair of molds 2 as shown in FIG. Meanwhile, the air blower 14 injects the air 4. The air blower 14 injects the air 4 to promote the volatilization of the solvent of the release agent 3 on the surface 21 of the mold 2 and suppress the dripping of the release agent 3. Further, by injecting the air 4, it is possible to remove foreign matters, such as flash, remaining on the surface 21 of the mold 2. Therefore, the quality of the coating film of the release agent 3 on the surface 21 of the mold 2 can be improved.

[Suitable release agent coating conditions]
As a result of earnest studies, the inventors of the present invention have found that if the amount of the release agent applied per unit area and unit time on the surface of the mold is a predetermined value or more, the release agent has a sufficient film thickness on the surface of the mold. Was found to be applied. Specifically, when a water-soluble mold release agent is applied to a mold, if the amount of the mold release agent applied per unit area unit time on the surface of the mold is 0.02 cc/s/cm ² or more, the mold release It has been found that the coating film of the mold agent is formed with a thickness of 0.5 μm or more. When the oil-based mold release agent is applied to the mold, if the amount of the mold release agent applied per unit area and unit time on the surface of the mold is 0.0002 cc/s/cm ² or more, the mold release agent is applied. It was found that the film was formed with sufficient thickness.
Furthermore, when the mold release agent coating device 1 according to the present embodiment is used to apply the mold release agent 3, the present inventors can set the flow rate of the mold release agent 3 within a predetermined range. It was found that the coating amount of 3 satisfies the above conditions and a sufficiently thick coating film can be formed. Hereinafter, the suitable coating conditions of the release agent 3 will be described. In the following description, a two-fluid nozzle is used as the first nozzle 12 and the second nozzle 13, and a water-soluble release agent is used as the release agent 3.

FIG. 3 is a table showing an example of suitable coating conditions when the release agent 3 is applied using the release agent coating apparatus 1.
As shown in FIG. 3, the pressure (spray air pressure) when spraying the release agent 3 from the first nozzle 12 and the second nozzle 13 is preferably in the range of 0.1 to 0.2 MPa. .. By setting the spray air pressure in the range of 0.1 to 0.2 MPa, the release agent 3 can be applied at an appropriate flow rate, and the release agent 3 can be applied in an appropriate thickness.

Further, when spraying the release agent 3 from the first nozzle 12 and the second nozzle 13, the air pressure (pattern air pressure) for compressing the spray in the vertical direction to adjust the shape of the spray pattern is 0.15. It is preferable to set the range to 0.2 MPa. By setting the pattern air pressure within the range of 0.15 to 0.2 MPa, it is possible to enhance the directivity of the injection of the release agent 3.

In addition, the flow rate (liquid agent flow rate) of the release agent 3 when the release agent 3 is sprayed from the first nozzle 12 and the second nozzle 13 is preferably 320 ml/min or more. By setting the liquid agent flow rate to 320 ml/min or more, the release agent 3 can be applied on the surface 21 of the mold 2 in a sufficient amount.

Further, the distance (spray distance) between the first nozzle 12 and the second nozzle 13 and the mold 2 is preferably in the range of 100 to 400 mm. By setting the spray distance in the range of 100 to 400 mm, the release agent 3 can be applied in an appropriate width.

The moving speed of the movable unit 11 (spray moving speed) is preferably in the range of 200 to 500 mm/s. By setting the spray moving speed to 200 mm/s or more, the release agent 3 can be applied quickly. Further, by setting the spray moving speed to 500 mm/s or less, the release agent 3 can be coated with a sufficient thickness.

In addition to the above conditions, when a water-soluble release agent is used as the release agent 3, it is preferable to set the temperature of the mold 2 in the range of 100 to 250°C. By setting the temperature of the mold 2 in the range of 100 to 250° C., it is possible to efficiently volatilize the water that is the solvent of the release agent 3 and suppress the dripping of the release agent 3.

FIG. 4 is a graph showing the coating amount of the release agent 3 per unit area and unit time at each point on the surface 21 of the mold 2 when the release agent 3 is coated under the above coating conditions. The vertical axis of FIG. 4 represents the density of the release agent 3 when each point of the mold 2 is reached, that is, the amount of liquid droplets per unit volume (cc/cm ³ ). The horizontal axis of FIG. 4 represents the average flow velocity (cm/s) of the release agent 3 when each point of the mold 2 is reached. The product of the amount of droplets of the release agent 3 per unit volume and the average flow velocity corresponds to the coating amount (cc/s/cm ² ) of the release agent 3 per unit area and unit time. In FIG. 4, a region in which the coating amount of the release agent 3 per unit area and unit time is 0.02 cc/s/cm ² or more is shown in gray.

In FIG. 4, a diamond-shaped plot (⋄) indicates the surface 21 of the mold 2 when the mold release agent 3 is sprayed while moving the mold release agent application apparatus 1 according to the present embodiment from above to below under the above conditions. The results of the coating amount of the release agent 3 at each point are shown. As shown in FIG. 4, when the release agent coating device 1 according to the present embodiment is used, the coating amount of the release agent 3 per unit area per unit time at any point on the surface 21 of the mold 2. Was in the range of 0.02 cc/s/cm ² or more. This indicates that by using the release agent applying apparatus 1 according to the present embodiment, the release agent could be efficiently applied to the mold by simple control.

On the other hand, in FIG. 4, a square plot (□) represents the case where the release agent is sprayed while moving the release agent application device that sprays the release agent only in the horizontal direction from the upper side to the lower side under the above conditions. The result of the coating amount of the release agent 3 at each point on the surface of the mold is shown. As shown in FIG. 4, when a conventional release agent coating device was used, there was a portion where the coating amount of the release agent per unit area per unit time was less than 0.02 cc/s/cm ² (black coating). Square). This indicates that the release agent applying device that sprays the release agent only in the horizontal direction could not sufficiently apply the release agent to the entire mold. That is, it shows that the mold release agent could not be efficiently applied to the mold by the simple control in the apparatus.

As described above, by using the release agent coating device 1 according to the present embodiment, even if the movable unit 11 is moved in one direction while the positions and flow rates of the nozzles are fixed, the surface 21 of the mold 2 is not affected. It was shown that the release agent 3 could be applied efficiently.

It should be noted that the present invention is not limited to the above embodiment, and can be modified as appropriate without departing from the spirit of the present invention.
For example, in the example of the above-described embodiment, the configuration when the release agent coating device 1 is viewed from the rear (x-axis negative direction) is the configuration when the release agent application device 1 is viewed from the front (x-axis positive direction). Although the configuration is the same as that of the above, each configuration may be different. For example, the positional relationship between the first nozzle 12 and the second nozzle 13 is such that the release agent application apparatus 1 is viewed from the front (x-axis positive direction) and the release agent application apparatus 1 is rearward (x-axis negative direction). It may be different from that when viewed from. The positional relationship between the first nozzle 12 and the second nozzle 13 can be appropriately changed according to the shape of the mold 2 facing each other.

Further, in the example of the above-described embodiment, the movable unit 11 includes the upper frame 11a, the vertical frame 11b, and the horizontal frame 11c. However, the configuration of the movable unit 11 is not limited to this. The movable unit 11 may have another structure as long as it can fix the first nozzle 12 and the second nozzle 13 and is movable between the pair of molds 2.

In addition, in the example of the above-described embodiment, the configuration in which the first nozzle 12 is attached to the upper horizontal frame 11c and the second nozzle 13 is attached to the lower horizontal frame 11c has been described. They may be reversed, or they may be attached to the same horizontal frame 11c.
However, it is preferable to dispose the first nozzle 12 above the second nozzle 13 as in the above embodiment. With such an arrangement relationship, the mold release agent 3 can be applied from the first nozzle 12 to the upper portion of the surface 21 of the mold 2 without excessively raising the movable unit 11. Further, the release agent 3 can be applied to the lower portion of the surface 21 of the mold 2 from the second nozzle 13 without excessively lowering the movable unit 11. Therefore, the moving distance of the movable unit 11 for applying the release agent 3 to the entire surface 21 of the mold 2 can be shortened.

Further, when the first nozzle 12 is arranged above the second nozzle 13, the mounting positions of the first nozzle 12 and the second nozzle 13 may be different in the left-right direction (y-axis direction). preferable. For example, the first nozzles 12 and the second nozzles 13 are preferably staggered as shown in FIG.
By changing the attachment positions of the first nozzle 12 and the second nozzle 13 in the left-right direction, the release agent ejected obliquely downward from the first nozzle 12 and the obliquely upward ejection from the second nozzle 13. Collision with the release agent can be suppressed. Therefore, the release agent can be applied more efficiently.

Further, in the example of the above embodiment, the operation in which the release agent applying apparatus 1 injects the release agent 3 toward the surfaces 21 of the pair of molds 2 and then injects the air 4 has been described. It may be an operation of injecting the release agent 3 after injecting. In this case, the release agent coating device 1 injects the air 4 while moving from the upper side to the lower side, and then ejects the release agent 3 while moving from the lower side to the upper side. In such a configuration, foreign matter such as flash cast remaining on the surface 21 of the mold 2 can be removed more efficiently.

1 Release Agent Application Device 2 Mold 3 Release Agent 4 Air 10 Control Part 11 Movable Unit 11a Upper Frame 11b Vertical Frame 11c Horizontal Frame 12 First Nozzle 13 Second Nozzle 14 Air Blow Device 21 Surface 111 Mounting Hole 141 Main Body Part 142 Air outlet

Claims (3)

A mold release agent application device for applying the mold release agent to the surfaces of the pair of molds by spraying a mold release agent while moving between the pair of molds,
A movable unit movable between the pair of molds,
A first nozzle fixed to the movable unit in a direction in which the release agent can be jetted obliquely downward;
A second nozzle fixed to the movable unit in a direction in which the release agent can be jetted obliquely upward.
Release agent coating device. The release agent is a water-soluble release agent,
The coating amount of the release agent per unit area and unit time on the surface of the mold is 0.02 cc/s/cm ² or more,
The release agent coating device according to claim 1. The release agent is an oil-based release agent,
The coating amount of the release agent per unit area and unit time on the surface of the mold is 0.0002 cc/s/cm ² or more,
The release agent coating device according to claim 1.