JP4321031B2 - Foam molding apparatus and foam molding method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for molding a foam in a cavity formed by a mold, and more particularly to demolding a foam after molding.
[0002]
[Prior art]
The foam (foamed resin) has a foam cell structure inside the resin and is excellent in heat insulation performance and cushion performance. For this reason, in addition to being used as building materials, packaging materials, etc., they are also used in various ways in automobile parts. For example, an instrument panel (instrument panel) for storing a speed meter or the like uses a urethane foam integrally formed with a base material and a skin.
[0003]
Such foam products are usually made by molding. Mold molding is a method of utilizing a cavity portion formed between two molds, typically an upper mold and a lower mold. The resin injected with both molds opened or fitted together expands with the progress of foaming by the foaming agent contained therein, and fills the cavity. Thereafter, the foam is cured into the shape of the cavity through the completion of foaming and the progress of cooling, and finally taken out from the mold.
[0004]
Like the above-described automobile instrument panel, foaming integrated with the base material or the skin is performed in the same manner. In this case, the base material may be fixed to the mold using pins or the like, and for the skin, a method that is separately prepared and installed in the mold, or a method that is directly applied to the mold by spray coating is adopted. Just do it. Thereafter, if a foamed resin is injected into the cavity, a foam integrated with the base material or the skin can be obtained.
[0005]
When a foam is molded using a resin having a strong adhesive force such as urethane, the foam sticks to the mold. Therefore, a means for applying a release agent to the mold surface in advance may be used (for example, Patent Document 1). Further, Patent Document 2 describes a means for improving the mold releasability of a molded product by flowing air between the mold and the molded product.
[0006]
When the back side of the mold has a structure wider than the front side, that is, when the mold has an undercut portion, it is difficult to pull out the foam from the mold. Therefore, a mold having an undercut portion is often manufactured so as to be divided into a plurality of small pieces so as to eliminate the catch. In addition, Patent Document 1 discloses the contents of easily performing demolding by using a means for injecting air in the vicinity of the undercut portion together with a release agent in the molding of the urethane foam including the undercut portion. .
[0007]
[Patent Document 1]
Japanese Utility Model Publication No. 5-91817
[Patent Document 2]
JP-A-6-134787
[0008]
[Problems to be solved by the invention]
However, as in Patent Document 1, if a release agent is used in order to avoid the foam from adhering to the mold, it is necessary to wipe off the release agent adhering to the product. Many inconveniences occur. In the means of Patent Document 2, once a ventilation path is formed between the mold and the molded product, the foam is hardly peeled from the mold at other locations.
[0009]
Furthermore, in the means of Patent Document 1 in the case of including an undercut part, the foam is forcibly pulled out, and when the undercut part is large, troubles such as forming a wrinkle in the foam occur.
[0010]
An object of the present invention is to eliminate these problems and make it possible to easily remove the molded foam from the mold.
[0011]
[Means for Solving the Problems]
  In order to solve the above-mentioned problems, the foam molding apparatus according to the first aspect of the present invention is a foam molding method in which a plurality of molds are fitted and a compressible foam is molded in a cavity formed between these molds. A body forming apparatus comprising: a sealing means for sealing the cavity part; and an injection means for injecting a fluid into the cavity part,The at least one mold is provided with an undercut portion, and the sealing means has a structure that maintains a sealed state even when the mold moves in the separating direction to a position where the foam comes out of the undercut portion.After completion of the molding of the foam, the cavity was pressurized by the injection means into the cavity that was sealed by the sealing means to increase the pressure of the cavity so that the foam was peeled off from the mold, and the foam was compressed to adhere to the mold Remove foam from moldAt the same time, the foam is removed from the mold without causing the undercut portion to be caught by moving the mold in the separation direction in the sealed state.
[0012]
  Further, the foam molding apparatus of the present invention is,in frontSealing meansIs provided in at least one mold, and is provided in a mold that fits with a first joint formed by extending in the separating direction of the mold and a mold having the first joint, and the first joint A second joint portion formed so as to be opposed to each other, and a seal portion that fills a gap between the first joint portion and the second joint portion when the first joint portion and the second joint portion are joined. It is characterized by that.
[0013]
Further, in the foam molding apparatus of the present invention, an opening for decompression is provided on the wall surface of at least one mold, and an auxiliary sealing means for sealing the cavity is installed in the vicinity of the opening so that the decompressed opening is provided. It is also possible to remove the mold by adsorbing the foam to the part.
[0014]
In addition, the foam molding apparatus of the present invention can mold a foam so as to be integrated with the base material or the skin.
[0015]
In the foam molding apparatus of the present invention, when the foam is molded so as to be integrated with the base material or the skin, at least one mold is provided with an undercut portion, and the sealing means includes at least foaming. It is desirable to have a structure that keeps the sealed state until the body comes out of the undercut part, and by the injection means, the foam can be compressed so that the mold can be removed without causing the undercut part to be caught. .
[0016]
In addition, the foam molding apparatus of the present invention, when the foam is molded so as to be integrated with the base material or the skin, at least one mold wall surface is used for decompressing the part facing the base material or the skin. An auxiliary sealing means for sealing the cavity portion can be installed in the vicinity of the opening portion, and the foam can be adsorbed to the decompressed opening portion and demolded.
[0017]
In addition, when the foam is molded so as to be integrated with the base material or the skin, the foam molding apparatus according to the present invention pulls the base material or the skin on at least one mold wall surface. It is possible to provide a lead-in part that pulls the part into the wall surface, and using the lead-in part, the foam can be attached to the mold including the lead-in part and demolded.
[0018]
Moreover, the foam molding apparatus of this invention may communicate the cell of a foam by compressing a foam with the said injection | pouring means.
[0019]
In the foam molding apparatus of the present invention, the injection means can also have a function of discharging the fluid in the cavity portion, and after removing the foam from the undercut portion, the cavity portion is formed by the injection means. By extending the foam under reduced pressure, the cells of the foam can be communicated with each other.
[0020]
  The foam molding method of the present invention is a foam molding method in which a compressible foam is molded in a cavity formed inside a plurality of fitted molds, and the foam is foamed in the cavity. A step of sealing the cavity part after foaming is finished, and injecting fluid into the sealed cavity part,So that the foam peels off the moldFluid pressureIncreaseCompress the foam,Glued to the moldPeeling the foam from the mold.
[0021]
Further, in the foam molding method of the present invention, when the cavity portion has an undercut portion, the foam is compressed to a size that eliminates the catch of the undercut portion by the pressure of the fluid injected into the sealed cavity portion. And a step of separating the mold while maintaining the sealed state of the cavity part and the compressed state of the foam until the foam exits the undercut part.
[0022]
In the foam molding method of the present invention, the foam molded at the cavity portion can include a base material or a skin.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the figure, the same members are denoted by the same reference numerals and description thereof is omitted.
[0024]
FIG. 1 is a cross-sectional view of a foam molding apparatus that molds an instrument panel of an automobile. In the illustrated apparatus, the mold is composed of an upper mold 10 and a lower mold 12, and a urethane foam is molded by a cavity portion 14 that is formed when both are fitted. Upper mold 10 is provided with upper mold joints 16a and 16b, and lower mold 12 is provided with lower mold joints 18a and 18b. Seal members 20a and 20b are provided on the upper portions of the lower mold joints 18a and 18b so as to fill gaps between the upper mold joints 16a and 16b, respectively. The upper mold joints 16a and 16b, the lower mold joints 18a and 18b, and the seal members 20a and 20b serve as a sealing means for sealing the cavity part 14. The cavity portion 14 is provided with injection means for injecting fluid from the fluid injection port 22 a via the fluid injection path 22. For this reason, it becomes possible to raise the pressure of a cavity part by inject | pouring a fluid in the state which sealed the cavity part. The fluid inlet 22a is provided with a mechanical lid or a tape that is peeled off by fluid pressure so that the urethane foam does not flow into the fluid injection path 22 during foaming.
[0025]
The wall surface of the lower mold 12 in the cavity portion 14 has undercut portions 24a to 24e, which are portions that become wider toward the back side. In order to remove the urethane foam molded from the undercut portions 24a-24e, a method of compressing the urethane foam by increasing the pressure of the cavity portion 14 as described later is used. For this reason, the size of the upper mold joints 16a and 16b and the lower mold joints 18a and 18b and the positions where the seal members 20a and 20b are arranged are the cavity parts 14 until the foam is taken out from the undercut parts 24a to 24e. Is determined in consideration of the depth of the undercut portions 24a to 24e in the mold separation direction. In addition, when there is no undercut part 24a-24e, it is not necessary to provide upper mold | type joining part 16a, 16b and lower mold | type joining part 18a, 18b. In that case, the sealing members 20a, 20b are the upper mold | type 10 and lower part. It may be used in a form that can be sealed only in a state where the mold 12 is completely fitted. The base material 26 provided in the cavity part 14 is for integrally molding the urethane foam with the base material 26. In the illustrated example, the base material 26 is made of a hard resin, and is fixed to the upper mold 10 in advance with pins not shown.
[0026]
FIG. 2 is a cross-sectional view showing a series of mold forming steps (a) to (e) performed by the foam molding apparatus of FIG. First, a foamable urethane resin is injected into the cavity portion 14 through a nozzle (not shown). As the foaming agent contained therein foams, the urethane resin expands into the urethane foam 28 having a foam-like cell structure and spreads over the entire cavity portion 14 (step (a)). Eventually, when foaming of the foaming agent is completed and the temperature of the urethane foam 28 is lowered, the urethane foam 28 is cured while maintaining the shape of the cavity portion 14. At this time, the urethane foam 28 is not only integrally molded with the base material 26 due to its adhesive force, but also sticks to the inner wall of the cavity portion 14. For this reason, the urethane foam 28 cannot be removed from the mold as it is.
[0027]
Therefore, first, the cavity portion 14 is sealed using the seal members 20a and 20b. The reason why the sealing members 20a and 20b are not sealed from the beginning of mold forming is that the air inside the cavity portion 14 must be released so as to prevent the pressure in the cavity portion 14 from increasing due to the expansion of the urethane foam 28. There is something that must be done. Of course, the sealing members 20a and 20b can be sealed from the beginning, and the pressure can be adjusted through another path (not shown) instead.
[0028]
Then, after the sealing of the cavity portion 14 is completed, the fluid injection port 22 a is opened, and a fluid, for example, air is sent into the cavity portion 14 from the fluid injection path 22. As a result, the urethane foam 28 is compressed by the pressure of the fed air, and is peeled off from the inner wall of the cavity portion 14, particularly from the inner wall of the lower mold 12 (step (b)). Although depending on the material, the base material 26 generally adheres more strongly to the urethane foam 28 than the metallic inner wall, so that the separation of the base material 26 and the urethane foam 28 is not a problem.
[0029]
When the undercut portions 24a to 24e are provided as in the present embodiment, the urethane foam 28 cannot be removed simply by separating the upper mold 10 and the lower mold 12 from each other. Therefore, as shown in step (c), a larger amount of air is sent from the fluid injection path 22 to the cavity portion 14, and the urethane foam 28 is strongly compressed so that the undercut portions 24a to 24e are not caught. . And the upper mold | type 10 and the lower mold | type 12 are opened, maintaining this compression state (process (d)). This compressed state is maintained by maintaining the sealing by the upper mold joints 16a and 16b, the lower mold joints 18a and 18b, and the seal members 20a and 20b, which are sealing means, and by continuously injecting air from the fluid injection path 22. Done.
[0030]
After the urethane foam 28 passes through the undercut portions 24a-24e, the pressure of the cavity portion 14 is lowered to match the external pressure through the fluid injection path 22 or an appropriate path (not shown), and the shape of the urethane foam 28 is changed. Revert. Thereafter, as in normal mold forming, the upper mold 10 and the lower mold 12 are opened, and the urethane foam 28 may be taken out (step (e)). In this series of steps, the movement of the mold is simple and the working time can be reduced as compared with the method of dividing the mold near the undercut portions 24a to 24e into a plurality of parts.
[0031]
In the description here, the base material 26 is installed on the upper mold 10, and the undercut portions 24 a to 24 e are provided on the lower mold 12. However, this configuration may be reversed upside down. In this case, it is only necessary to leave the urethane foam 28 in the lower mold when the mold is opened. Therefore, in consideration of the effect of gravity, it may not be necessary to fix the base material 26 to the lower mold. As a special example, an example in which undercut portions 24a to 24e are provided in both the upper die 10 and the lower die 12 is also conceivable. At this time, by separately providing a means for moving the urethane foam 28 in the cavity portion 14, it is possible to perform the removal from the undercut portions 24 a to 24 e. It goes without saying that the roles are basically the same even if the two molds are arranged in the horizontal direction instead of the vertical direction.
[0032]
Next, with reference to FIG. 3, the process of attaching the urethane foam to the upper mold and taking it out will be described. FIG. 3 is basically the same as the cross-sectional view of FIG. 1, except that an opening 30 for pressure reduction is provided on the wall surface of the upper mold 10 of the cavity portion 14, from which a pressure reduction path 32 is provided. Is growing. The opening 30 is at a position facing the base material 26 installed in the cavity portion 14. In addition, auxiliary seal members 34 a and 34 b are provided between the upper mold 10 and the base material 26 around the opening 30. The auxiliary seal members 34a and 34b serve as auxiliary sealing means for maintaining the sealing of the cavity portion 14. For this reason, even when the pressure in the cavity portion 14 is increased, the pressure in the vicinity of the opening portion 30 remains at atmospheric pressure, and the base material 26 and the urethane foam 28 are opened in the opening portion 30 by being relatively reduced in pressure. Pressed against. Therefore, in the operation of compressing the urethane foam 28 shown in FIG. 3 and removing the undercut portions 24a-24e, the urethane foam 28 can be attached to the upper mold 10 and removed from the lower mold 12. Become.
[0033]
Although not shown, a pressure reducing pump can be provided in the pressure reducing path 32 to reduce the pressure in the vicinity of the opening 30. As a result, when the pressure in the vicinity of the opening 30 is reduced to atmospheric pressure or less, the urethane foam 28 can be attached to the upper mold even after the upper mold 10 and the lower mold 12 are completely separated. .
[0034]
FIG. 4 shows another process in which the urethane foam 28 molded by the upper mold 40 and the lower mold 42 is attached to the upper mold 40 and taken out. On the wall surface of the upper mold 40, a drawing portion 44 for drawing the base material 26 into the upper die 40 is provided, and a hook 45 at the tip of the drawing portion 44 is hooked on a hooking portion 46 on the back surface of the base material 26. Yes. For this reason, the base material 26 and the urethane foam 28 can be deformed from the state shown on the left in FIG. 4 to the state shown on the right by causing the drawing portion 44 to perform the drawing operation. Although the operating principle of the drawing-in part 44 is not specified, in this embodiment, the drawing-in part 44 is connected to a hydraulic cylinder 48, and this hydraulic pressure is controlled using a solenoid valve (not shown), thereby Pull-in and push-back are realized. The retracting portion 44 allows the urethane foam 28 to be attached to the upper die 40 when the upper die 40 and the lower die 42 are opened, and undercut portions 24f and 24g provided on the lower die 42. The urethane foam 28 can be removed from the mold. For this reason, the upper die 40 and the lower die 42 shown in FIG. 4 are the guide-like upper die joints 16a and 16b and the lower die joint provided in the upper die 10 and the lower die 12 shown in FIG. 18a and 18b and the seal members 20a and 20b are not provided. However, the function of removing the mold from the undercut portions 24f and 24g using the drawing-in portion 44 utilizes the sealing of the cavity portion 14 and the compression of the urethane foam 28 shown in steps (c) and (d) of FIG. In this case, the compressibility of the urethane foam 28 can be kept small.
[0035]
Here, the process of making the cells of the urethane foam 28 communicate with each other will be described using the cross-sectional views of FIGS. 5 and 6. The cells of the urethane foam 28 are made by foaming the foaming agent contained in the urethane resin. By making the cells communicate with each other, the pressure distribution between the cells of the urethane foam 28 is made uniform, The shape of the foam 28 can be stabilized. FIG. 5 shows a situation in which a large amount of air is fed into the cavity portion 14 from the fluid injection path 22 after the peeling shown in step (b) of FIG. As a result, the urethane foam 28 is strongly compressed and the pressure in the cells in the urethane foam 28 is increased, so that the walls of the cells are destroyed and the cells communicate with each other. The air injection amount is set to a predetermined value so as to induce a pressure that causes this communication. Needless to say, the cavity portion 14 must be sealed in order to communicate in this step. What is necessary is just to use the sealing means fundamentally demonstrated using FIG. Needless to say, this step is not limited to the step after the peeling step, and can be performed anytime in a state where the cavity portion 14 is sealed. In view of efficiency, the urethane foam 28 is preferably heated in a relatively soft high temperature state.
[0036]
FIG. 6 shows a state close to vacuum by removing air from the cavity portion 14 through the fluid injection path 22 after removal from the undercut portions 24a to 24e shown in steps (c) and (d) of FIG. It shows how it was done. In order to enable this, the fluid injection path 22 has a function of discharging the fluid from the cavity portion 14 in addition to the function of injecting the fluid into the cavity portion 14. As a result, the urethane foam 28 is expanded by the pressure of the gas in the cell and the cell wall is destroyed, so that the cells of the urethane foam 28 are connected. In this step, unlike the other series of steps, the cavity portion has a lower pressure than the outside, and therefore it is necessary to mount the sealing means so that the sealing can be maintained even if the pressure gradient is reversed.
[0037]
In the above description, the urethane foam 28 has been molded so as to be integrated with the base material 26. However, the present embodiment is not limited to this situation. That is, only the urethane foam 28 may be molded without using the base material 26, or instead of using the base material 26, it may be molded so as to have a skin around the urethane. It is also possible to use both the base material 26 and the skin.
[0038]
However, if only the urethane foam 28 is used, there is a possibility that some parts that do not move may remain adhered to the mold during the mold release shown in step (b) of FIG. is required. When the base material 26 is fixed, the urethane foam 28 moves so as to approach the base material 26 as a result of compression, and the mold release proceeds. However, when there is no fixed part, the moving direction cannot always be controlled. Because. Therefore, if necessary, the movement at the time of compression may be controlled by providing a protrusion or the like on a part of the cavity portion 14 to limit the movement of the urethane foam 28.
[0039]
Further, when only the urethane foam 28 is used, in order to provide the pressure reducing path 32 described in FIG. 3, it is necessary to attach a mechanical lid or the like to the opening 30 as a substitute for the auxiliary seal members 34a and 34b. is there. This mechanical lid is closed and acts as an auxiliary sealing means when injecting urethane into the cavity portion 14 or when compressing and releasing the urethane foam 28. When pressure is applied to the urethane foam 28 to remove it from the undercut portions 24 a-24 e, the mechanical lid is opened, and the urethane foam 28 is attracted to the opening 30 and adheres to the upper mold 10. Therefore, in this situation, the adsorbed urethane foam 28 itself maintains the sealing of the cavity portion 14.
[0040]
Furthermore, as another precaution when using only the urethane foam 28, it is necessary to consider the strength of the urethane foam 28 when the hooking portion 46 shown in FIG. .
[0041]
In the case where only the urethane foam 28 and the skin are molded without using the base material 26, the above-described thing can be executed by using the skin instead of the base material 26 as long as the skin has sufficient strength and rigidity. . Moreover, when both the base material 26 and the skin are used, considering the arrangement and strength of the both, a material that is easy to use can be selected as appropriate, and the above-described steps can be performed.
[0042]
Here, another method for easily removing the foam from the mold will be briefly described. As described in the section of the prior art, a release agent may be applied to the mold in order to prevent the foam from adhering to the mold. By mixing this release agent with the resin, The adhesive effect can be weakened. However, in the case where the base material is molded so as to be integrated with the resin, the bond between the base material and the foam is weakened, resulting in inconvenience. A means for solving this problem will be described with reference to FIG. As shown in the cross-sectional view on the left side of FIG. 7, the base material 54 provided between the upper mold 50 and the lower mold 52 has release prevention protrusions 56 a and 56 b on the contact surface with the urethane foam 28. Is provided. The separation preventing projections 56a and 56b are attached so as to form a figure eight, and restrict the movement of the urethane foam 28 in the horizontal direction and the vertical direction in the drawing to prevent the separation. Also, as shown in the sketch on the right side of FIG. 7, the separation preventing projections 56 a and 56 b are provided with a plurality of holes 58 a to 58 e, and this space is filled with the urethane foam 28. The effect of preventing separation from the base material 54 is enhanced. The separation preventing projections 56a and 56b can be used even when a release agent is not mixed in the urethane foam 28, and in particular, means for strongly compressing the urethane foam 28, which is a feature of the present embodiment. When used, the adhesive strength with the base material 54 can be enhanced, which is useful.
[0043]
Lastly, a case where the molding is performed by fitting three or more molds will be described. Mold molding may be performed using a plurality of molds, particularly when the mold has a complicated undercut portion. The arrangement of the molds in this case can be considered in various ways. For example, the third mold is arranged on the side surfaces of the upper mold 10 and the lower mold 12 so as not to break the sealed state created by these molds. Would also be possible. In addition, other arrangements are possible, and as an example, FIG. 8 shows a cross-sectional view of a foam molding apparatus including three molds. Here, the molds 60a-60c are arranged 120 degrees apart from each other. Further, guide portions 62a-62c for guiding them are provided, and the sliding directions of the molds 60a-60c are defined so as to be different from each other by 120 degrees. And seal member 64a-64f is attached near the both ends of guide part 62a-62c so that the clearance gap between type | molds 60a-60c may be plugged up. Therefore, the cavity part 66 made by the three molds 60a-60c can be sealed by a sealing means including the molds 60a-60c, the guide parts 62a-62c, and the seal members 64a-64f. The cavity portion 66 includes undercut portions 68a-68f. For this reason, the foam is compressed from the undercut portions 68a-68f by making the length of the guide portions 62a-62c at least larger than the depth of the undercut portions 68a-68f seen in the separating direction of the corresponding mold. And can be removed. It goes without saying that all the other steps described so far in the case of the two types can also be carried out. Of course, it is necessary to install a plurality of fluid injection means, decompression openings and the like which are not shown in FIG. 8 as necessary. In the case where there are four or more molds, a foam molding apparatus can be similarly produced.
[0044]
As described above, the present embodiment is effective for removing the foam adhered to the mold in the mold molding of the foam, as well as demolding from the mold having the undercut portion, and the foam cell. It is also useful for communication. In this embodiment, the urethane foam has been described as the foam. However, all of the compressible foams can be applied in the same manner as this embodiment. Moreover, it can be widely used not only for automobile instrument panels used in the description herein but also for general foam molding.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an apparatus according to an embodiment.
FIG. 2 is a cross-sectional view showing a series of steps of the embodiment.
FIG. 3 is a cross-sectional view showing another process.
FIG. 4 is a cross-sectional view showing still another process.
FIG. 5 is a cross-sectional view illustrating a communication process.
FIG. 6 is a cross-sectional view illustrating another communication process.
FIG. 7 is a sectional view and a sketch of a substrate.
FIG. 8 is a cross-sectional view of an apparatus using three molds.
[Explanation of symbols]
10 Upper mold, 12 Lower mold, 14 Cavity part, 16a, 16b Upper mold joint part, 18a, 18b Lower mold joint part, 20a, 20b Seal member, 22 Fluid injection path, 22a Fluid injection port, 24a-24e Undercut part , 26 base material, 28 urethane foam.

Claims (11)

A foam molding apparatus for fitting a plurality of molds and molding a compressible foam in a cavity formed between these molds,
Sealing means for sealing the cavity,
Injection means for injecting fluid into the cavity,
With
At least one mold is provided with an undercut,
The sealing means consists of a structure that maintains a sealed state even when the mold moves in the separation direction to a position where at least the foam comes out of the undercut portion,
After completion of the molding of the foam, the cavity was pressurized by the injection means into the cavity that was sealed by the sealing means to increase the pressure of the cavity so that the foam was peeled off from the mold, and the foam was compressed to adhere to the mold A foam molding apparatus that removes a foam from the mold and removes the foam without causing the undercut portion to be caught by moving the mold in the separation direction in a sealed state . The foam molding apparatus according to claim 1 ,
Before Symbol sealing means is,
A first joint provided in at least one mold and extending in the direction of separation of the mold;
Provided in a mold that fits with a mold having a first joint, and a second joint formed so as to be opposed to the first joint;
When the first joint and the second joint are joined, a seal part that fills the gap between these joints;
A foam molding apparatus characterized by comprising: The foam molding apparatus according to claim 1 or 2,
At least one mold wall is provided with an opening for decompression,
Near the opening, an auxiliary sealing means for sealing the cavity is installed,
A foam molding apparatus for removing a mold by adsorbing a foam to a decompressed opening. A foam molding apparatus that molds a compressible foam so as to be integrated with a base material or a skin in a cavity formed between a plurality of molds and formed between the molds,
Sealing means for sealing the cavity,
Injection means for injecting fluid into the cavity,
With
At least one mold is provided with an undercut,
The sealing means consists of a structure that maintains a sealed state even when the mold moves in the separation direction to a position where at least the foam comes out of the undercut portion,
After completion of the molding of the foam, the cavity was pressurized by the injection means into the cavity that was sealed by the sealing means to increase the pressure of the cavity so that the foam was peeled off from the mold, and the foam was compressed to adhere to the mold A foam molding apparatus that removes a foam from the mold and removes the foam without causing the undercut portion to be caught by moving the mold in the separation direction in a sealed state . The foam molding apparatus according to claim 4 ,
Before Symbol sealing means is,
A first joint provided in at least one mold and extending in the direction of separation of the mold;
Provided in a mold that fits with a mold having a first joint, and a second joint formed so as to be opposed to the first joint;
When the first joint and the second joint are joined, a seal part that fills the gap between these joints;
A foam molding apparatus characterized by comprising: The foam molding apparatus according to claim 4 or 5,
At least one mold wall surface is provided with an opening for decompression at a portion facing the substrate or the skin,
Near the opening, an auxiliary sealing means for sealing the cavity is installed,
A foam molding apparatus for removing a mold by adsorbing a foam to a decompressed opening. The foam molding apparatus according to claim 4 or 5,
At least one mold wall surface is provided with a lead-in portion that pulls the base material or skin to draw a part of the foam into the wall surface,
A foam molding apparatus for removing a mold by attaching a foam to a mold including the drawing portion using the drawing portion. The foam molding apparatus according to any one of claims 1, 2, 4, and 5,
A foam molding apparatus for communicating foam cells by compressing the foam by the injection means. The foam molding apparatus according to claim 2 or 5,
The injection means also has a function of discharging the fluid of the cavity portion,
A foam molding apparatus that connects foam cells by removing the foam from the undercut and then decompressing the cavity with an injection means to extend the foam. A foam molding method for molding a compressible foam in a cavity portion formed in a plurality of fitted molds,
Foaming the foam in the cavity,
After the foaming is finished, sealing the cavity part,
Injecting fluid into the sealed cavity, increasing the pressure of the fluid to compress the foam so that the foam peels off the mold, and peeling the foam adhered to the mold from the mold;
When the cavity part has an undercut part,
The step of compressing the foam to a size that eliminates the catch of the undercut portion by the pressure of the fluid injected into the sealed cavity portion,
The step of separating the mold while maintaining the sealed state of the cavity portion and the compressed state of the foam until the foam exits the undercut portion, and
A foam molding method comprising: The foam molding method according to claim 10,
The foam molded by the cavity part is a foam molding method including a base material or a skin.

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