Method for manufacturing foam molding dies and foam molded products
The foam molding die with a columnar portion and gap configuration enables efficient burr removal in foam molded products by forming a film portion that can be easily broken, addressing inefficiencies in existing deburring methods.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- INOAC CORP
- Filing Date
- 2024-10-29
- Publication Date
- 2026-05-15
Smart Images
Figure 2026078621000001_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to a foam molding die and a method for manufacturing a foam molded product.
Background Art
[0002] Conventionally, it is known that burrs generated in a foam molded product manufactured using a foam molding die are cut off with pliers, cutters, etc. (for example, see Patent Document 1).
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
[0016] , FIG. 4)
Summary of the Invention
Problems to be Solved by the Invention
[0004] The present disclosure provides a technique for improving the efficiency of the burr removal operation for a foam molded product.
Means for Solving the Problems
[0005] One aspect of the invention is a foam molding die including first and second mold halves that can be opened and closed, the first and second mold halves forming a cavity for molding a foam molded product by mold closing, and in the mold-closed state, the first mold half having a columnar portion protruding from the cavity surface of the first mold half toward the cavity surface of the second mold half, the columnar portion having, at its tip, an outer edge portion forming a first gap with the cavity surface of the second mold half and an inner region surrounded by the outer edge portion forming a second gap with the cavity surface of the second mold half, the first and second gaps being for forming a film portion that is removed from the foam molded product by breaking the outer edge portion, and the second gap being formed larger than the first gap in the mold-closing direction.
Brief Description of the Drawings
[0006] [Figure 1] Figure 1A is a perspective view of the foamed molded product according to the first embodiment, and Figure 1B is a perspective view of the bottom of the foamed molded product. [Figure 2] Figure 2 is a plan view of the foamed molded product immediately after the molding process. [Figure 3] Figure 3 is a side cross-sectional view of a foam molding die. [Figure 4] Figure 4 is a side cross-sectional view of a foam molding die in which a foamed product is formed inside the cavity. [Figure 5] Figure 5 is a side cross-sectional view of the butted column members and the base. [Figure 6] Figure 6A is an enlarged perspective view of the annular projection and flattened recess of the columnar section, and Figure 6B is an enlarged perspective view of the recessed section of the base. [Figure 7] Figure 7 is a side cross-sectional view of a foam molding die in the open state after the foaming material has been injected. [Figure 8] Figure 8 is a side cross-sectional view of a foam molding die in a closed state with foaming material injected. [Figure 9] Figure 9 is a side cross-sectional view of the membrane formed inside the through hole. [Figure 10] Figures 10A, 10B, and 10C are side cross-sectional views of foam molding dies according to other embodiments. [Modes for carrying out the invention]
[0007] [First Embodiment] Referring to Figures 1 to 9, a foam molding die 10 according to one embodiment of the present disclosure will be described. Figure 1A shows a foam molded product 50 according to the present embodiment. The foam molded product 50 is, for example, a seat pad used in the seating area of the front seat of a vehicle. Hereinafter, the up and down, left and right, and front and back directions of the foam molded product 50 when it is attached to a vehicle will be simply referred to as up and down, left and right, and front and back. Also, the side of the foam molded product 50 on which the occupant sits will be called the front surface, and the opposite side will be called the back surface.
[0008] As shown in Figure 1B, the foamed molded product 50 of this embodiment is integrally molded with a base member 60, and the cushion member 70 covers the entire surface of the base member 60 except for the lower surface. The base member 60 is used as the core member of the foamed molded product and is made of a bead foam molded body of, for example, polystyrene resin or polyolefin resin. The base member 60 has a substantially rectangular planar shape and is provided with a recess 61 on a part of its lower surface that is stepped down. The bottom wall of the recess 61 is sloped such that the front end of the base member 60 is the deepest and the opposite end is the shallowest. In addition, a plurality of base-side through holes 62 are formed in the bottom wall of the recess 61. The plurality of base-side through holes 62 open to the front and back surfaces of the base member 60 and are arranged, for example, in two rows and two columns.
[0009] The cushion member 70 is made of, for example, soft polyurethane foam, has cushioning properties, and constitutes a part that can come into contact with an occupant sitting on the foamed molded product 50. As shown in Figure 1A, the cushion member 70 has a trapezoidal seating portion 51 in plan view. In addition, raised embankments 52 are formed on both the left and right sides and the rear side of the seating portion 51. Furthermore, a plurality of grooves 53 are formed on the upper surface of the seating portion 51.
[0010] The seating portion 51 is provided with a plurality of through holes 54 that open to the front and back surfaces of the seating portion 51. The plurality of through holes 54 open to the front and back surfaces of the foamed molded product 50. The plurality of through holes 54 are arranged in two rows and two columns, corresponding to a plurality of base-side through holes 62. The plurality of through holes 54 communicate with the base-side through holes 62 of the base member 60, and together they form an air distribution passage. The air distribution passage is for sending temperature-controlled air supplied from a blower (not shown) towards the occupant seated on the seating portion 51.
[0011] Furthermore, the foamed resin constituting the cushion member 70 in this embodiment is not limited to polyurethane resin, but can be any resin that can be foamed and molded. The foamed structure may be an open-cell structure with good ventilation, or a closed-cell structure without good ventilation. Also, the base member 60 is not limited to resin, but may be made of metal. Although the entire base member 60, except for its bottom surface, is covered by the cushion member 70, a portion of the side or top surface of the base member 60 may be exposed from the cushion member 70.
[0012] Furthermore, although the foamed molded product 50 is integrally molded with the base member 60, it does not have to be integrally molded. For example, a recess capable of receiving the base member 60 may be formed on the back surface of the cushion member 70, and the base member 60 may be fixed in the recess with an adhesive or the like. Also, the foamed molded product 50 does not have to have a base member 60.
[0013] As shown in Figure 2, a parting line L is located on the outer edge of the foamed molded product 50 in the foaming mold 10. Immediately after the foamed molded product 50 is demolded from the foaming mold 10, a burr 55 may protrude from the parting line L. In this case, the manufacturing of the foamed molded product 50 is completed only after the burr 55 is removed.
[0014] Furthermore, the number of through-holes 54 and base-side through-holes 62 is not limited to four; there may be five or more, or three or fewer. In addition, the foamed molded product 50 may be used not only for the front seats of a vehicle, but also for the rear seats of a vehicle, seats in trains, ships, and other vehicles.
[0015] The foamed molded product 50 is molded by, for example, a foaming mold 10 having the following structure. As shown in FIG. 3, the foaming mold 10 includes an upper mold 30 as a "first mold" and a lower mold 20 as a "second mold". While the lower mold 20 is fixed, the upper mold 30 is rotatably supported and overlapped with the lower mold 20 from the vertical direction. That is, in the foaming mold 10 of the present embodiment, the vertical direction is the mold closing direction and the mold opening direction, and the foamed molded product 50 is molded in a state where the top and bottom are reversed within the foaming mold 10.
[0016] Sealing portions 20L and 30L that abut against each other in the mold closed state are provided on the lower mold 20 and the upper mold 30. The sealing portions 20L and 30L are formed to be in surface contact with each other, and regulate the leakage of the foaming raw material G outside the foaming mold 10 in the molding process of the foamed molded product 50 described later.
[0017] The lower surface of the foamed molded product 50 is molded by the inner surface of the cavity 40 in the upper mold 30 (hereinafter referred to as the "cavity surface 30C of the upper mold 30"), while the outer surface other than the lower surface of the foamed molded product 50 is molded by the inner surface of the cavity 40 in the lower mold 20 (hereinafter referred to as the "cavity surface 20C of the lower mold 20"). Further, a fitting protrusion 31 is formed on the upper mold 30 by protruding a part of the cavity surface 30C. Then, as shown in FIG. 4, the recess 61 of the base member 60 is fitted with the fitting protrusion 31, and the lower surface of the base member 60 is overlapped with the peripheral edge of the fitting protrusion 31 on the cavity surface 30C.
[0018] In order to form a plurality of through holes 54 in the foamed molded product 50, a plurality of columnar portions 32 protrude from the cavity surface 30C of the upper mold 30, and a plurality of base portions 24 are provided on the cavity surface 20C of the lower mold 20 coaxially with the plurality of columnar portions 32 in the mold closed state. And these corresponding columnar portions 32 and base portions 24 are abutted against each other.
[0019] Specifically, the multiple columnar portions 32 have a diameter of, for example, 5 to 30 cm, and in this embodiment, they are cylindrical in shape, longer than that diameter. The multiple columnar portions 32 extend parallel to each other from the fitting projection 31 on the cavity surface 30C of the upper mold 30, and their tip surfaces are located at the bottom of the cavity 40. The base ends of the multiple columnar portions 32 pass through the through holes 62 of the base member 60, as shown in Figure 4, thereby holding the base member 60 in the upper mold 30.
[0020] In this embodiment, the multiple base portions 24 are cylindrical in shape, with the outer diameter of the tip being the same as the outer diameter of the columnar portion 32. The base portion is thicker than the tip portion due to being rounded off between it and the cavity surface 20C of the lower mold 20. Furthermore, the amount of protrusion of the base portion 24 from the cavity surface 20C of the lower mold 20 is smaller than the amount of protrusion of the columnar portion 32 from the cavity surface 20C of the upper mold 30.
[0021] In this embodiment, the columnar portion 32 and the base portion 24 have a circular columnar cross-section, but the cross-sectional shape can be anything, for example, a polygon or an ellipse. Furthermore, the cross-sectional shapes of the columnar portion 32 and the base portion 24 may differ depending on their axial position, or the size of the cross-section may gradually change in a tapered manner. In addition, in this embodiment, the upper mold 30 is provided with the columnar portion 32, while the lower mold 20 is provided with a base portion 24 that is shorter than the columnar portion 32, but the reverse may also be true, or the columnar portion 32 and the base portion 24 may have the same length.
[0022] As shown in Figure 3, the corresponding columnar portion 32 and base portion 24 (hereinafter simply referred to as "columnar portion 32 and base portion 24") are configured such that a gap S (shown prominently in Figure 3) is formed between their tip surfaces when the mold is closed. This gap S consists of a first gap S1 and a second gap S2, as shown in Figure 5.
[0023] Specifically, as shown in Figure 6A, the tip surface of the columnar portion 32 has a shape in which the portion inside the outer edge is recessed into a flat cylindrical shape. That is, the tip surface of the columnar portion 32 has an annular projection 34 on its outer edge, and the inside of it is a flat recess 35. Furthermore, the back surface of the flat recess 35, the tip surface of the annular projection 34, and the tip surface of the base portion 24 are all, for example, flat and parallel to each other. The aforementioned first gap S1 is formed between the tip surface of the annular projection 34 and the tip surface of the base portion 24, and the second gap S2 is formed between the back surface of the flat recess 35 and the tip surface of the base portion 24.
[0024] More specifically, the size of the first gap S1 in the mold closing direction is, for example, 0.1 to 0.5 mm, and the size of the second gap S2 in the mold closing direction is, for example, 1.0 to 5.0 mm. Also, the size of the first gap S1 in the direction perpendicular to the mold closing direction (i.e., the width of the tip surface of the annular projection 34) is, for example, 2.0 to 5.0 mm.
[0025] In this embodiment, the annular projection 34 is structured in such a way that its entire circumference cannot contact the base portion 24 when the mold is closed. However, one or more projections may be provided that further protrude from the tip surface of the annular projection 34, allowing these projections to contact the base portion 24.
[0026] As shown in Figure 6B, a cylindrical recessed portion 25 is formed in the center of the tip surface of the base portion 24 that faces the flat recess 35. The depth of the recessed portion 25 is greater than the amount that the base portion 24 protrudes from the inner surface of the cavity 40. In other words, the lower end of the recessed portion 25 is located below the portion of the cavity surface where the base portion 24 rises.
[0027] Furthermore, the depth of the recessed portion 25 may be the same as or slightly less than the protrusion of the base portion 24. Also, the recessed portion 25 does not have to be cylindrical; for example, it may be conical or plate-shaped. Moreover, the base portion 24 may be constructed without a recessed portion 25.
[0028] This concludes the description of the structure of the foamed molded product 50 and the foaming mold 10 in this embodiment. The manufacturing method of the foamed molded product 50 will now be described. The manufacturing method includes a molding process for the foamed molded product 50 using the foaming mold 10 and a finishing process performed on the foamed molded product 50 after demolding from the foaming mold 10. First, the molding process will be described with reference to Figures 7 to 8.
[0029] As shown in Figure 7, the columnar portion 32 is inserted through the through hole 62 on the base side, and the fitting projection 31 fits into the recess 61, so that the back surface of the base member 60 comes into contact with the cavity surface 30C of the upper mold 30. In this way, the base member 60 is held inside the upper mold 30. Next, the foaming material G is injected into the lower mold 20. At this time, the foaming material G is also injected into the recessed portion 25 of the base portion 24.
[0030] As shown in Figure 8, the upper mold 30 is closed to form a cavity 40, and the tips of the columnar portion 32 and the base portion 24 face each other, forming first and second gaps S1 and S2 between them. The foaming material G is then sandwiched between the annular projection 34 and the flattened recess 35 of the columnar portion 32 and the protruding end of the base portion 24.
[0031] The mold remains closed, and the foaming material G accumulated at the bottom of the lower mold 20 foams and expands. Then, as shown in Figure 4, the cavity 40 is filled with foam, forming a cushion member 70, and the foamed molded product 50 is formed. If gaps occur in the seal portions 20L and 30L, the foaming material G that seeps into those gaps becomes burrs 55.
[0032] At this time, the foaming material G also foams and expands between the tip of the columnar part 32 and the base part 24. Then, the first and second gaps S1 and S2 and the inside of the recessed part 25 are filled with foam, and a membrane part 56 that closes the through hole 54 of the foamed molded product 50 and a gripping part 57 that is integrated with the membrane part 56 are formed.
[0033] More specifically, as shown in Figure 9, the membrane portion 56 comprises an outer thin-walled portion 56A and an inner thick-walled portion 56B. The outer thin-walled portion 56A is the portion formed by the annular projection 34 of the columnar portion 32 and the outer edge of the base portion 24, that is, the portion that was located in the first gap S1, and is annular in shape. This outer thin-walled portion 56A is integrated with the inner wall of the through hole 54.
[0034] The inner thick-walled portion 56B is formed inside the outer thin-walled portion 56A. The inner thick-walled portion 56B is the portion formed by the flattened recess 35 of the columnar portion 32 and the portion excluding the outer edge of the base portion 24, that is, the portion that was located in the second gap S2, and is thicker than the outer thin-walled portion 56A.
[0035] A knob portion 57 is formed in the center of the inner thickened portion 56B, extending toward the seating portion 51 of the foamed molded product 50. The knob portion 57 is formed by the recessed portion 25 and is integrated with the membrane portion 56. The protruding end of the knob portion 57 is located outward from the upper surface of the seating portion 51.
[0036] This concludes the explanation of the molding process for the foamed molded product 50. Next, the finishing process for the foamed molded product 50 will be explained. In the finishing process, burrs 55 and the film portion 56 are removed from the foamed molded product 50. Specifically, first, the burrs 55 are removed from the foamed molded product 50 shown in Figure 2, for example, using a cutting tool such as a cutter. On the other hand, the film portion 56 is removed by pinching and pulling the tab 57 that protrudes from the seat portion 51, causing only the thin outer edge portion 56A to break and the film portion 56 to be removed from the inner wall of the through hole 54. This forms a through hole 54 that penetrates the foamed molded product 50 in the thickness direction, and the manufacturing of the foamed molded product 50 is completed.
[0037] By the way, in a typical foam molding die used to form a foamed product 50, the end surfaces of the columnar part 32 and the base part 24 for forming the through hole 54 are flat overall and in surface contact with each other, which is why burrs can form inside the through hole 54. However, it is difficult to maneuver scissors or a cutter inside the through hole 54 or around its opening edge, and even if one tries to remove the burrs by pinching them with fingers or a tool, the burrs break in parts, requiring multiple deburring operations for each through hole 54.
[0038] In contrast, in this embodiment, a first gap S1 and a second gap S2 are provided between the columnar portion 32 and the base portion 24. With this configuration, a film portion 56 with a thinner outer edge than the inner edge is formed inside the through hole 54. Of this film portion 56, the thin outer edge portion 56A that is integrated with the inner wall of the through hole 54 is thin, so by pulling, only this thin outer edge portion 56A breaks, making it possible to remove the film portion 56 in one step. Furthermore, since the thick inner portion 56B surrounded by the thin outer edge portion 56A is relatively thicker, it is possible to prevent the film portion 56 from breaking in an unintended location. Moreover, by providing a gripping portion 57 on the thick inner portion 56B that extends to the outside of the seating portion 51 of the foamed molded product 50, the film portion 56 can be removed without inserting a finger into the through hole 54.
[0039] Thus, according to the foam molding die 10 of this embodiment, the difficult task of removing burrs from the through holes 54 of the foam molded product 50 is reduced, and the efficiency of burr removal work on the foam molded product 50 is improved.
[0040] [Other embodiments] (1) In the first embodiment described above, an annular projection 34 and a flat recess 35 were formed at the tip of the columnar portion 32, but as shown in Figure 10A, they may be formed on the base portion 24 side. With this configuration, the foaming material G injected into the cavity surface 20C of the lower mold 20 during the molding process is more easily stored on the base portion 24 by the annular projection 34.
[0041] (2) As shown in Figure 10B, the base portion 24 may not be formed on the cavity surface 20C of the lower mold 20, and only a recessed portion 25 may be provided on the part facing the tip of the columnar portion 32.
[0042] (3) In the above embodiment, the first and second gaps S1 and S2 were provided so that the outer thin-walled portion 56A and the inner thick-walled portion 56B were both formed into a flat plate shape. However, the first and second gaps S1 and S2 may be provided so that one or both of the outer thin-walled portion 56A and the inner thick-walled portion 56B are not flat. Specifically, as shown in Figure 10C, a conical recess 28A may be provided in the base portion 24, and a conical fitting projection 29 formed on the columnar portion 32 may be received therein, so that a second gap S2 is formed between the recess 28A and the fitting projection 29, and a first gap S1 may be formed between the outer edges of both end faces of the columnar portion 32 and the base portion 24. Then, the flat outer thin-walled portion may be formed by the first gap S1, while the conical inner thick-walled portion may be formed by the second gap S2.
[0043] (4) In the first embodiment described above, a columnar portion 32 was provided on the cavity surface 30C of the upper mold 30 and a base portion 24 was provided on the cavity surface 20C of the lower mold 20. However, the base portion 24 may be provided on the cavity surface 30C of the upper mold 30 and the columnar portion 32 may be provided on the cavity surface 20C of the lower mold 20.
[0044] <Note> The following describes the features extracted from the above embodiment, explaining their effects and other aspects as needed. For the sake of understanding, corresponding configurations in the above embodiment will be indicated in parentheses as appropriate, but these features are not limited to the specific configurations indicated in parentheses. [Feature 1] A foam molding die (10) comprising first and second molds (30, 20) that can be opened and closed, wherein the first and second molds (30, 20) form cavities (40) for forming a foam molded product (50) when the molds are closed, and in the closed state, a columnar portion (32) protrudes from the cavity surface (30C) of the first mold (30) toward the cavity surface (20C) of the second mold (20), and the tip of the columnar portion (32) In this foam molding die (10), the outer edge portion (34) forms a first gap (S1) with the cavity surface (20C) of the second mold (20), and the inner region (35) surrounded by the outer edge portion (34) forms a second gap (S2) with the cavity surface (20C) of the second mold (20), and the first and second gaps (S1, S2) are for forming a membrane portion (56) that is removed from the foam molded product (50) by rupturing the outer edge portion (56A) of the membrane, and the second gap (S2) is formed to be larger than the first gap (S1) in the mold closing direction.
[0045] According to Feature 1, the film formed by the first and second gaps can be removed by rupturing the outer edge, making it possible to easily remove burrs even in relatively narrow places such as through holes formed in columnar sections where burrs are difficult to remove.
[0046] [Feature 2] The foam molding die (10) according to feature 1, wherein the second molding die (20) has a recessed portion (25) formed by recessing a part of the inner region (35).
[0047] According to Feature 2, a gripping portion formed by a recess is integrally provided on a part of the membrane that is to be broken, making it possible to remove the membrane more easily by gripping and pulling this portion.
[0048] [Feature 3] The foam molding die (10) according to feature 2, wherein the second molding die (20) is provided with a base portion (24) that protrudes toward the tip of the columnar portion (32), and the first and second gaps (S1, S2) are formed between the columnar portion (32) and the base portion (24), and the amount of protrusion of the base portion (24) is smaller than the amount of protrusion of the columnar portion (32).
[0049] The columnar portion may be configured to directly face the cavity surface of the second mold, or, as in Feature 3, it may face a base portion provided on the second mold. Furthermore, because the base portion protrudes less than the columnar portion, the location where the film portion is formed is shifted to one side of the foamed molded product in the direction of penetration of the through hole, making it easier to remove the film portion.
[0050] [Feature 4] The foam molding die (10) according to feature 3, wherein the recessed portion (25) is formed in the base portion (24), and its depth is greater than the amount of protrusion of the base portion (24).
[0051] Because the depth of the recessed portion is greater than the protrusion of the base portion, the gripping portion formed by the recessed portion protrudes from the upper surface of the through-hole opening, thereby allowing the membrane portion to be removed without inserting a finger into the through-hole.
[0052] [Feature 5] The second mold (20) is the lower mold, which is the foam molding mold (10) described in Feature 1.
[0053] The second mold may be an upper mold or a lower mold as shown in Feature 5.
[0054] [Feature 6] The foamed molded product (50) is a cushion pad for vehicles in which the through-hole (54) penetrates from the back side to the seating surface, as described in Feature 1, and is a method for manufacturing the foamed molded product (50).
[0055] The foamed molded product may be a cushion pad for vehicles, a seat back, or may be applied to foamed molded products for other uses.
[0056] [Feature 7] The foam mold (10) according to any one of claims 1 to 5, wherein the foam molded product (50) is a cushion pad for a vehicle, the first and second gaps (S1, S2) are for forming a membrane portion (56) that is removed from the cushion pad for the vehicle by breaking the outer edge portion (56A), and the columnar portion (32) is for forming a through hole (54) that penetrates the seating side surface and the back surface of the cushion pad for the vehicle when the membrane portion (56) is removed.
[0057] [Feature 8] A method for manufacturing a foamed molded product (50) using the foamed molding die (10) described in Feature 7, wherein, in the second molding die (20), foaming material (G) is poured onto the portion of the second molding die (20) that faces the columnar portion (32) when the mold is closed, and then the mold is closed to foam the foaming material (G) in the cavity (40), and the foamed molded product (50) is formed by the first and second gaps (S1, S2) having a membrane portion (56) in which the outer edge portion (56A) of the membrane is thinner than the inner portion (56B) of the membrane surrounded by the outer edge portion (56A), and after demolding, the membrane portion (56) is removed to form a foamed molded product (50) having a through hole (54).
[0058] According to Features 7 and 8, a thin membrane is formed within the through-hole, making it possible to rupture the membrane along its outer edge, thus making the membrane removal process more efficient.
[0059] While this specification and drawings disclose specific examples of the technology included in the claims, the technology described in the claims is not limited to these specific examples, but also includes various modifications and changes to these examples, as well as parts of the examples taken individually. [Explanation of Symbols]
[0060] 10 Foam molding dies 20 Lower mold 20C cavity surface 24 Base 25. Sinkhole 30 Upper mold 30C cavity surface 32 Columnar part 34 Annular projection 35 Flattened recess 40 Cavity 50 Foamed molded products 54 Through hole 56 Membrane part 56A Thin-walled outer edge 56B Inner thick wall part 60 Base member 70 Cushion material 70 G Foaming raw materials S Gap S1 First Gap S2 The second gap
Claims
1. A foam molding die comprising first and second molds that can be opened and closed, The first and second molds form cavities for molding foamed products by closing the molds. In the closed state, the mold includes a columnar portion that protrudes from the cavity surface of the first mold toward the cavity surface of the second mold, At its tip, the columnar portion has an outer edge that forms a first gap with the cavity surface of the second mold, and an inner region surrounded by the outer edge that forms a second gap with the cavity surface of the second mold. The first and second gaps are for forming a membrane portion that is removed from the foamed molded product by breaking the outer edge. A foam molding die in which the second gap is formed to be larger than the first gap in the mold closing direction.
2. The foam molding die according to claim 1, wherein the second molding die has a recessed portion formed in which a part of the inner region is recessed.
3. The second mold is provided with a base portion that protrudes toward the tip of the columnar portion, The first and second gaps are formed between the columnar portion and the base portion. The foam molding die according to claim 2, wherein the amount of protrusion of the base portion is smaller than the amount of protrusion of the columnar portion.
4. The foam molding die according to claim 3, wherein the recessed portion is formed in the base portion, and its depth is greater than the amount of protrusion of the base portion.
5. The foam molding die according to claim 1, wherein the second molding die is the lower mold.
6. A method for manufacturing a foamed molded product using a foamed molding die according to any one of claims 1 to 5, In the second mold, after applying the foaming material to the portion facing the columnar portion while the mold is closed, the mold is closed to allow the foaming material to foam within the cavity. The first and second gaps allow for the formation of the foamed molded product having a film portion whose outer edge is thinner than the inner region. A method for manufacturing a foamed molded product, wherein a foamed molded product having through holes is formed by removing the membrane portion after demolding.
7. The method for manufacturing a foamed molded product according to claim 6, wherein the foamed molded product is a cushion pad for a vehicle in which the through holes open to the seating surface and the surface on the back of it.