JP2011031536A - Molding method of foaming resin substrate and mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding method of a foaming resin substrate in a laminate molded article with a surface skin vacuum-stuck and a mold, which produce no sag of a shape in a vacuum hole peripheral part provided on the foaming resin substrate and enable a molding of a high accuracy. <P>SOLUTION: The forming resin substrate 21 is molded by a steps of injection-filling a foaming resin material M to the inside of a cavity C formed by a cavity mold 50 and a core mold 60, thereafter, of carrying out a retreat operation of the cavity mold 50, and of carrying out a foaming reaction expanding a mold clearance to mold. A projection 63 for forming a vacuum hole projecting on the core mold 60 is shape-set in a tapered form considering a demolding inclination. Further, concavo-convex parts such as a ring-shaped projection 52, a rib 53, and a squeezing pattern 54 are formed on the mold surface of the cavity mold 50 corresponding to the projection 63 for forming the vacuum hole. By increasing the followability of a semi-molded article P at the time of the retreat operation of the cavity mold 50, the shape sag of the vacuum hole 23 peripheral part is suppressed and an appearance performance and a hand feeling of the laminate molded article 20 can be increased. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a method for molding a foamed resin base material and a molding die in a laminated molded product obtained by vacuum-adhering an outer skin, and in particular, to accurately shape a peripheral portion of a vacuum hole established in the foamed resin base material. The present invention relates to a method for molding a foamed resin base material and a mold so that the appearance of a product in a laminated molded product can be maintained beautifully by performing well.

  FIG. 11 shows an automotive door trim 1 mounted on the indoor surface side of a door panel (not shown). The door trim 1 has an armrest 1a on which an occupant rests with an elbow in the center of the surface in order to enhance functionality. Is formed so as to bulge indoors. In addition, a door pocket 1b capable of storing equipment is opened below, and a speaker grille 1c is provided integrally or separately from the door trim 1 on the front side. As shown in FIG. 12, the door trim 1 is composed of a laminated molded product in which the skin 3 is integrally bonded to the surface of the foamed resin base material 2. Particularly recently, the door trim 1 is lightweight and resistant as a core structure. Because of its excellent impact and low cost, the foamed resin base material 2 formed by molding a foamed resin material in which a foaming agent is mixed into a polypropylene (PP) resin into a required shape tends to be frequently used. Note that reference numeral 2 a in FIG. 12 indicates a number of vacuum holes that are opened in the foamed resin base material 2.

  Next, a conventional molding method for the foamed resin substrate 2 will be described below with reference to FIG. The molding die 4 used in the conventional method is composed of a cavity mold 5 and a core mold 6 that can be clamped and opened with each other, and is defined by clamping the cavity mold 5 and the core mold 6. The foamed resin base material 2 is molded into a required shape by injecting and filling the foamed resin material M into the cavity C through the resin passage 6a. Conventionally, in order to keep the cavity C at a high pressure, air is injected into the cavity C from the external air mechanism through the air injection tube 7 and the foamed resin material M is injected and filled in a state where the foaming reaction is suppressed. In addition, after the injection filling of the foam resin material M, the cavity mold 5 is retracted by a predetermined stroke to widen the clearance between the cavity mold 5 and the core mold 6 to lower the cavity internal pressure and induce the foaming reaction of the foam resin material M. The foamed resin substrate 2 is molded into a required shape. Reference numeral 8 in the figure denotes a seal ring that seals the outer periphery of the cavity C. Further, in order to open the vacuum hole 2 a in the foamed resin base material 2 at the same time as molding, the core mold 6 is provided with a projection 9 for forming a vacuum hole. A conventional method for molding a foamed resin base material 2 and a molding die used therefor are described in detail in Patent Document 1.

Japanese Patent Laid-Open No. 2005-7818

  Thus, in the conventional method for molding the foamed resin base material 2 in the door trim 1, the cavity mold 5 and the core mold 6 are clamped to define the cavity C. As shown in FIG. When the foamed resin base material 2 is molded by injecting and filling the foamed resin material M into the cavity C, the vacuum hole 2a is opened simultaneously with the molding by the vacuum hole forming projection 9 projecting from the core mold 6. Further, after the injection filling of the foamed resin material M, as shown in FIG. 15, when the cavity mold 5 is retracted, a shape sag (indicated by symbol “a” in FIG. 15) occurs at the periphery of the vacuum hole 2a. As shown, when the skin 3 is adhered to the surface of the foamed resin base material 2, a depression caused by the shape droop a on the surface side of the vacuum hole 2 a of the foamed resin base material 2 (indicated by reference sign b in FIG. 16). It has been pointed out that the appearance performance and the touch feeling are deteriorated.

  The cause of the shape sag a is that when the cavity mold 5 shown in FIG. 15 is retracted, the vacuum hole forming projection 9 restrains the semi-molded product P, so that the followability of the semi-molded product P to the cavity mold 5 is reduced. Inferred.

  The present invention has been made in view of such circumstances, and in the molding method of a foamed resin base material and a molding die in a laminated molded product in which the skin is integrated by vacuum bonding, simultaneously with the molding of the foamed resin base material. Forming method of foamed resin base material that can prevent the dripping of the shape at the periphery of the vacuum hole as much as possible when opening the vacuum hole, and can maintain the appearance performance and feeling of touch of the laminated molded product. An object of the present invention is to provide a molding die.

  In order to achieve the above object, as a result of intensive research, the present inventors have devised the shape of the vacuum hole forming protrusion provided in the core mold, and semi-molded from the vacuum hole forming protrusion during the retraction operation of the cavity mold. As a result, it has been found that the conventional defect can be effectively solved by providing a holding function between the mold surface of the cavity mold and the semi-molded product. It was.

  That is, the present invention relates to a method for molding a foamed resin base material in a laminated molded article obtained by integrally attaching a skin to the surface of a foamed resin base material by vacuum molding, and the foamed resin base material includes a cavity mold and a core. After the foamed resin material is injected and filled into the cavity defined by clamping the mold, the cavity mold is retracted, and the half-molded product is foamed and reacted to the required shape with the cavity internal pressure reduced. In the molding method of the foamed resin base material, which is formed and simultaneously opened with a vacuum hole for vacuum forming the skin, the core mold is for forming a vacuum hole for opening a vacuum hole in the foamed resin base material. The protrusions are tapered so as to take into account the mold drawing gradient, and the cavity mold corresponding to the vacuum hole forming protrusion has an uneven portion for fitting and holding the semi-molded product. In this way, when the cavity mold is retracted after the foamed resin material is injected and filled into the cavity, the restraining force on the vacuum hole forming projections is loosened, and the concave and convex portions provided on the cavity mold surface are used. The semi-molded product is made to follow the cavity mold so that the shape of the periphery of the vacuum hole of the foamed resin base material is accurately formed.

  Further, the molding die used in the method of the present invention is a molding die for molding a foamed resin base material in a laminated molded product obtained by integrally sticking the skin by vacuum molding on the surface of the foamed resin base material molded into a required shape. This mold is composed of a cavity mold and a core mold that can be clamped together and opened, and protrudes from the core mold to open a vacuum hole in the foamed resin base material. The vacuum hole forming projection is tapered so that the mold drawing gradient is taken into account, and when the cavity mold is retracted in the mold opening direction, the cavity mold surface follows the cavity mold. Is provided with an uneven portion that can be expected to be held by uneven fitting with a semi-molded product.

  Here, as a laminated molded product, a door trim, a rear parcel shelf, a floor trim, a trunk trim, a luggage side trim, a roof trim, and a rear side trim, as long as the skin is adhered to the surface of the foamed resin base material by vacuum molding. It can be applied to all automotive interior parts. In addition, a foamed resin material in which a foaming agent is mixed in a synthetic resin is used as the material of the foamed resin base material. The usable synthetic resins are polyethylene resin, polypropylene resin, polystyrene resin, polyethylene terephthalate. Resin, polyvinyl alcohol resin, vinyl chloride resin, polyamide resin, polyacetal resin, polycarbonate resin, ionomer resin, acrylonitrile / butadiene / styrene (ABS) resin, etc. As the agent, an organic foaming agent such as azodicarbonamide or an inorganic foaming agent such as sodium bicarbonate can be used.

  The method of the present invention includes an injection filling step of a foamed resin material in which a cavity mold and a core mold are clamped, and then the foamed resin material is injected and filled into a cavity defined between the molds. After the injection filling of the material is completed, the process comprises a foaming step in which the cavity mold is retracted by a predetermined stroke, the internal pressure of the cavity is lowered to induce a foaming reaction, and a foamed resin base material having a required shape is molded. Before the injection filling of the foam resin material, air is introduced into the cavity from the external air supply mechanism through the air injection pipe provided in the core mold, and the cavity is quickly squeezed while suppressing the foaming reaction of the foam resin material. The foamed resin material is injected and filled to every corner, and during the foaming reaction, the cavity mold is retracted by a predetermined stroke to secure the foaming space, and the inside of the cavity is maintained at a low pressure, so that the foaming reaction is easily started. In this way, a foaming reaction is induced, and the foamed resin base material is formed into a required shape. At this time, a plurality of vacuum holes are opened at predetermined positions in the foamed resin base material by the vacuum hole forming protrusions provided in the core mold. Furthermore, in the present invention, when the vacuum hole is opened in the foamed resin base material, the vacuum hole forming protrusion protruding from the core mold is tapered in consideration of the mold drawing gradient, and the vacuum hole The mold surface of the cavity mold corresponding to the forming projection is provided with uneven portions such as ring-shaped protrusions, ribs, drawn patterns, holes, etc. that can hold the semi-molded product by fitting with the semi-formed product. In addition, as an uneven | corrugated | grooved part provided in a cavity type | mold, the convex part which can ensure a smooth surface on a product surface when coating | covering a skin | skin in a post process is desirable, However It is not limited to a convex part.

  As is apparent from the above configuration, in the method of the present invention, the cavity mold and the core mold are clamped to define the cavity, and then the foamed resin material is injected and filled into the cavity, and then the cavity mold is formed. The vacuum hole forming protrusion protruding from the core mold is set in a tapered shape when the foaming reaction is performed by reversing the predetermined stroke, so that the semi-molded product is a vacuum hole forming protrusion. The restraint force is weak, it is easy to come off from the protrusion, and the concave and convex portions provided on the cavity mold surface and the semi-molded product are in a state of being fitted, so the semi-molded product follows when the cavity mold is retracted. Since it is easy, the shape does not sag at the periphery of the vacuum hole as in the prior art, and a sharp shape can be obtained.

  As described above, the foamed resin base material molding method according to the present invention sets the shape of the vacuum hole forming projection into a tapered shape when the vacuum hole is opened simultaneously with the molding, and the vacuum hole forming projection and Since the cavity surface of the corresponding cavity mold is provided with an uneven part that can be expected to fit with a semi-molded product, the cavity mold is retracted by a predetermined stroke after the foamed resin material is injected and filled into the cavity. In the foaming process in which a foaming reaction is performed by operation, the restraining force applied to the semi-molded product from the projection for forming the vacuum hole is eased, and the concave and convex portions of the cavity mold and the semi-molded product are engaged with each other so that the cavity mold During retraction operation, the semi-molded product follows the cavity mold, so the shape of the vacuum hole periphery does not sag and the shape can be accurately shaped. To become. Therefore, when the skin is vacuum-formed on the surface of the foamed resin molded product, the product surface corresponding to the vacuum hole is not depressed, the smoothness of the product surface can be emphasized, and the appearance performance and touch feeling can be enhanced. It has the effect.

It is a front view which shows the door trim for motor vehicles provided with the door trim upper shape | molded by applying the method of this invention. It is sectional drawing which shows the structure of the door trim upper shape | molded by applying the method of this invention. It is a general view which shows the structure of one Example of the shaping die used for this invention method. It is a principal part expanded sectional view in the molding die shown in FIG. It is explanatory drawing which shows the state before the injection filling process of the foaming resin material in this invention method. It is explanatory drawing which shows the injection filling process of the foaming resin material in this invention method. It is explanatory drawing which shows the state which retracts a cavity type | mold after the injection filling process of the foamed resin material in the method of this invention. It is explanatory drawing which shows the structure of the vacuum hole vicinity at the time of backward operation of the cavity type | mold shown in FIG. It is explanatory drawing which shows the modification of the shaping die based on this invention. It is sectional drawing which shows the further modification of the shaping die concerning this invention. It is a front view which shows the conventional door trim. It is sectional drawing which shows the structure of the conventional door trim. It is a general view which shows the shaping die used for shaping | molding of the conventional door trim. It is explanatory drawing which shows the injection filling process of the foamed resin material in the shaping | molding method of the conventional door trim. It is explanatory drawing which shows the foaming process in the shaping | molding method of the conventional door trim. It is explanatory drawing which shows the malfunction of the shaping | molding method of the conventional door trim.

  Hereinafter, specific examples of a method for molding a foamed resin substrate and a molding die according to the present invention will be described in detail with reference to the accompanying drawings. Note that the gist of the present invention is as described in the scope of claims, and the contents of the embodiments described below are merely examples of the present invention.

  FIGS. 1 to 10 show an embodiment of the present invention. FIGS. 1 and 2 are front and sectional views showing a door trim upper formed by the method of the present invention, and FIG. 3 is a molding used in the method of the present invention. 4 is an overall view showing a schematic configuration of the mold, FIG. 4 is an enlarged cross-sectional view of the main part of the mold, FIGS. 5 to 8 are explanatory views showing each step of the method of the present invention, and FIGS. It is each explanatory drawing which shows the modification of the shaping die to be used.

  In FIG. 1 and FIG. 2, the automobile door trim 10 is composed of an upper and lower divided body of a door trim upper (laminated molded product) 20 and a door trim lower (single molded product) 30. An inside handle unit 11 is attached to the door trim upper 20, and a pull handle 12 and a power window switch finisher 13 are attached to an armrest portion on which an occupant places an elbow. On the other hand, the door trim lower 30 is provided with a pocket opening 14 in which equipment can be accommodated, and the speaker grill 15 is provided integrally with or separately from the door trim lower 30 on the front side thereof.

  By the way, the present invention is directed to the door trim upper 20 in the door trim 10. That is, as shown in FIG. 2, the door trim upper 20 is configured by integrally attaching a skin 22 to the surface of a foamed resin base material 21 that is lightweight and excellent in impact resistance by vacuum molding. The product surface dent (indicated by symbol b in FIG. 16) caused by the drooping shape (indicated by symbol a in FIG. 15) around the vacuum hole 23 provided in the resin base material 21 is eliminated, resulting in a smooth product. An appearance can be obtained, and an improvement in appearance performance and touch feeling can be expected. Further, the vacuum hole 23 has a so-called taper shape in which the hole diameter increases from the front surface to the back surface, and a ring-shaped groove portion 24 is formed on the front surface side of the foamed resin base material 21 around the vacuum hole 23. Is formed. As will be described later, the ring-shaped groove portion 24 is necessary for achieving accurate shaping around the vacuum hole 23 by the fitting action with the molding die.

  Next, as the material of the foamed resin base material 21, a foamed resin material in which a foaming agent is mixed in a synthetic resin is used, and usable synthetic resins include polyethylene resins, polypropylene resins, and polystyrene resins. , Polyethylene terephthalate resin, polyvinyl alcohol resin, vinyl chloride resin, polyamide resin, polyacetal resin, polycarbonate resin, ionomer resin, acrylonitrile / butadiene / styrene (ABS) resin, etc. Thus, an organic foaming agent such as azodicarbonamide or an inorganic foaming agent such as sodium bicarbonate is used.

  And the laminated sheet material which backed the cushion layer 22b on the back surface of the top layer 22a is used for the skin 22 stuck by the vacuum forming on the surface of this foamed resin base material 21, As a top layer 22a, non- Any material can be used as long as it has air permeability, but a TPO (thermoplastic olefin) sheet or a PVC sheet can be used. As the cushion layer 22b, a foamed resin sheet such as polyethylene foam, polypropylene foam, polyurethane foam or the like can be used. Can be used.

Next, a method for forming the foamed resin base material 21 in the door trim upper 20 will be described. As shown in FIG. 3, the molding die 40 used in this molding method includes a cavity mold 50 and a core mold 60 that can be mutually clamped and opened, and an internal pressure of the cavity C at the time of injection filling with the foamed resin material M. On the other hand, at the time of foaming reaction of the foamed resin material M, the air supply / discharge mechanism 70 for supplying and discharging air to lower the internal pressure of the cavity C and the outer periphery of the cavity C are arranged so that the air leaks to the outside. The seal mechanism portion 80 is generally configured from the prevention. The gas used in the air supply / discharge mechanism 70 may be N ₂ gas, CO ₂ gas, factory air, or the like.

  Next, the configuration of the molding die 40 will be described more specifically. The cavity mold 50 can be moved up and down by a predetermined stroke by an elevating cylinder 51, and the core mold 60 is provided with a hot runner 61 and a gate 62 which are resin passages of the foamed resin material M from an unillustrated injection machine. . Further, in the air supply / discharge mechanism 70, a common pipe 71 is disposed in the core mold 60, and the common pipe 71 is branched and connected to an external blower 72 and a vacuum pump 73, respectively, via a switching valve 74. The common pipe 71 functions as an air supply pipe or an air discharge pipe. Next, the configuration of the outer peripheral seal mechanism 80 provided on the outer periphery of the cavity C will be described. An accommodation groove 81 is formed in the cavity mold 50, and a seal ring 82 is accommodated in the accommodation groove 81. On the other hand, the core mold 60 is provided with a sealing projection 83 projecting at a location corresponding to the seal ring 82, and when the cavity mold 50 and the core mold 60 are clamped, the seal ring 82 on the cavity mold 50 side. Then, the sealing projection 83 on the core mold 60 side is in contact and sealed, so that air leakage to the outside is avoided.

  By the way, the mold structure that greatly contributes to the method of the present invention is characterized by the structure of the vacuum hole 23 forming portion opened in the foamed resin base material 21. That is, as shown in FIG. 4, the vacuum hole forming protrusion 63 for opening the vacuum hole 23 in the foamed resin base material 21 is shaped in a taper shape in consideration of the die cutting gradient. By adopting, when the cavity mold 50 is retracted, the restraint force of the vacuum hole forming projection 63 with respect to the semi-molded product P is reduced. Further, the cavity mold 50 is provided with a ring-shaped protrusion 52 projecting from the middle point of the portion that contacts the vacuum hole forming protrusion 63 when the cavity mold 50 is clamped. The ring-shaped protrusion 52 has a function of increasing the fitting force with the semi-molded product P.

  Next, the method of the present invention will be described with reference to FIGS. First, as shown in FIG. 5, the cavity mold 50 is lowered to the bottom dead center by driving the elevating cylinder 51, and a cavity C is formed by the cavity mold 50 and the core mold 60. Air is supplied from the blower 72 of the mechanism 70 through the common pipe 71. After that, as shown in FIG. 6, the foamed resin material M is injected and filled into the cavity C through the hot runner 61 and the gate 62 of the core mold 60. At this time, since the inside of the cavity C is maintained at a high pressure by the air supplied from the air supply / discharge mechanism 70, the foamed resin material M quickly induces the cavity C in an unfoamed state without inducing a foaming reaction. It goes to every corner. Hereinafter, the state before the foaming process of the foamed resin material M is referred to as a semi-molded product P.

  Next, as shown in FIG. 7, in order to cause the foaming reaction of the unfoamed half-molded product P, the cavity mold 50 is moved upward by a predetermined stroke as shown in the figure to lower the cavity internal pressure. As for the air supply / discharge mechanism 70, the switching valve 74 is switched, the vacuum pump 73 and the common pipe 71 are connected, and excess air in the cavity C is discharged to the outside through the common pipe 71, resulting in an air pool. Instead, the foamed resin base material 21 is quickly foam-molded into a required shape. At this time, as shown in FIG. 8, in the vicinity of the vacuum hole 23, when the cavity mold 50 is retracted, the vacuum hole forming projection 63 is set in a tapered shape. Since the restraining force is reduced and the ring-shaped protrusion 52 formed on the mold surface of the cavity mold 50 is fitted to the ring-shaped groove 24, the semi-molded product P is vacuumed when the cavity mold 50 is retracted. Thus, the cavity mold 50 is reliably followed at the place where the 23 is formed. Therefore, in the vicinity of the vacuum hole 23, the shape can be accurately formed without forming a droop as in the prior art.

  Next, FIG. 9 shows a modification of the cavity mold 50, and instead of the ring-shaped protrusion 52 described above, as shown in FIGS. 9 (a) and 9 (b), it contacts the vacuum hole forming protrusion 63. A structure in which ribs 53 extending in four directions are provided on the mold surface of the cavity mold 50 around the portion, or a structure in which a drawn pattern 54 is provided as shown in FIG. 9 (c), and as shown in FIG. 9 (d). It is also possible to appropriately change to a configuration in which the hole 55 is set in the hole or a configuration in which the ring-shaped groove 56 is formed as shown in FIG. In addition, when the hole 55 and the ring-shaped groove 56 are employed, the hole diameter of the hole 55 and the ring-shaped groove 56 are ensured so that smoothness is ensured on the product surface when the skin 22 is vacuum-bonded in a subsequent process. It is necessary to set a narrow width.

  In this way, the concave-convex structure represented by the pattern shapes shown in FIGS. 9A to 9E centering on the portion corresponding to the vacuum hole forming protrusion 63 of the core die 60 on the mold surface of the cavity die 50 is formed. The pattern shape is not particularly limited as long as it can be employed and a holding effect can be expected by fitting with the semi-molded product P and unevenness.

  Next, as shown in FIG. 10, a cylindrical protrusion 57 may be formed on the mold surface of the cavity mold 50 corresponding to the vacuum hole forming protrusion 63 of the core mold 60. Is formed with a stepped taper hole 23a having a step at the contact portion between the cylindrical protrusion 57 and the vacuum hole forming protrusion 63. Due to this hole shape, when the cavity mold 50 is retracted, the semi-molded product P The followability to the cavity mold 50 is enhanced, and the shape droop around the vacuum hole 23 can be effectively eliminated.

  Thus, according to the method of the present invention, when forming the foamed resin base material 21 in the door trim upper 20, the shape of the vacuum hole forming projection 63 projecting from the core mold 60 is set to a taper shape, and correspondingly. The mold surface of the cavity mold 50 is provided with concavo-convex parts 52 to 57 having a function of following the semi-molded product P when the cavity mold 50 is retracted, so that when the foamed resin base material 21 is molded, As a result, the door trim upper 20 formed by vacuum-bonding the outer skin 22 on the surface of the foamed resin base material 21 can prevent the sagging of the shape, and the product surface corresponding to the many vacuum holes 23 is not formed with depressions. The emphasis can be emphasized, and the appearance performance and touch feeling can be maintained well.

  In the embodiment described above, the method of the present invention is applied to the molding of the door trim upper 20 in the door trim 10 having the upper and lower split structure. However, the application target is not limited to the door trim upper 20, and the foamed resin for vacuum-bonding the skin is applied. Applicable to all substrates. Further, although the counter pressure method is adopted as a method for forming the foamed resin base material 21 in the door trim upper 20, it is not limited to the counter pressure method. Furthermore, in the method of the present invention, the cavity mold 50 is the movable side, but the core mold 60 may be the movable side.

10 Automotive door trims 20 Door trim uppers (laminate molding)
21 Foamed resin base material 22 Skin 23 Vacuum hole 24 Ring-shaped groove 30 Door trim lower (single molded product)
DESCRIPTION OF SYMBOLS 40 Molding die 50 Cavity type | mold 51 Lifting cylinder 52 Ring-shaped protrusion 53 Rib 54 Drawing pattern 55 Hole 56 Ring-shaped groove 57 Cylindrical protrusion 60 Core type | mold 61 Hot runner 62 Gate 63 Vacuum hole formation protrusion 70 Air supply / discharge mechanism 71 Common piping 72 Blower 73 Vacuum pump 74 Switching valve 80 Seal mechanism 81 Receiving groove 82 Seal ring 83 Protrusion for sealing C Cavity M Foamed resin material P Semi-molded product

Claims (2)

A method for molding a foamed resin base material (21) in a laminated molded article (20) obtained by integrally bonding a skin (22) to a surface of a foamed resin base material (21) by vacuum molding, the foamed resin base material (21) is a method of injecting and filling the foamed resin material (M) into the cavity (C) defined by clamping the cavity mold (50) and the core mold (60), and then removing the cavity mold (50). The semi-molded product (P) is subjected to foaming reaction in a state where the cavity internal pressure is lowered by the backward operation and molded into a required shape, and a vacuum hole (23) for vacuum-molding the skin (22) is formed simultaneously with the molding. In the molding method of the foamed resin substrate (21) to be established,
In the core mold (60), a vacuum hole forming projection (63) for opening a vacuum hole (23) in the foamed resin base material (21) is formed in a taper shape in consideration of a mold drawing gradient. At the same time, the mold surface of the cavity mold (50) corresponding to the vacuum hole forming projection (63) is provided with the uneven portions (52 to 57) for fitting and holding the semi-molded product (P). When the cavity mold (50) is retracted after the foamed resin material (M) is injected and filled in the cavity (C), the restraining force on the vacuum hole forming projection (63) is relaxed and the cavity mold (50) The shape of the periphery of the vacuum hole (23) of the foamed resin base material (21) is accurately determined by causing the semi-molded product (P) to follow the cavity mold (50) by the concave and convex portions (52 to 57) provided on the mold surface. Do well Method of molding the foamed resin base material, characterized in that there was Unishi.   Mold for molding the foamed resin base material (21) in the laminated molded product (20) obtained by integrally attaching the skin (22) to the surface of the foamed resin base material (21) molded into a required shape by vacuum molding. (40), the molding die (40) is composed of a cavity mold (50) and a core mold (60) that can be mutually clamped and opened, and a foamed resin substrate (21). In order to open the vacuum hole (23), the vacuum hole forming protrusion (63) protruding from the core mold (60) has a tapered shape in consideration of the die cutting gradient, When the mold (50) is retracted in the mold opening direction, the mold surface of the cavity mold (50) can be expected to be held by uneven fitting with the semi-molded product (P) so as to follow the cavity mold (50). Concavities and convexities (52-57) are provided. Molding die of the foamed resin base material, wherein.

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