Method for manufacturing luggage plate

Abstract

In a method for manufacturing a luggage panel by press-forming a material, the generation of wrinkles in a skin material (12) is suppressed. According to the method for manufacturing the luggage plate, in a pressing step, a main material part (19) with a core material (10) arranged between two resin plates (9) is subjected to press forming. Furthermore, in the press-forming step, the main material part (19) is sandwiched and press-formed by a die (15A) for shaping the outer surface of one resin plate (9) and a die (15B) for shaping the outer surface of the other resin plate (9). Furthermore, in the pressing step, a surface material (12) in a state in which tension is applied is disposed between the outer surface of the one resin plate (9) and the shaped surface (15As) of the mold (15A), and the surface material (12) is press-molded together with the main material part (19) while being held in a state in which tension is applied.

Description

Technical Field

[0001] The invention relates to a method for manufacturing a luggage board. Background Art

[0002] Conventionally, the following luggage board is known as a member constituting the floor surface of a luggage compartment of an automobile. That is, the luggage compartment is provided behind the rear seats in the interior of the car, for example, and the luggage board is provided as a lid for closing the luggage compartment under the floor from above, and is provided so that the luggage compartment can be opened by pulling up the luggage board.

[0003] Furthermore, the luggage board features a layered structure designed to enhance rigidity, lightweightness, and aesthetics. Specifically, a core material for height enhancement is placed between two resin panels, and a surface material is placed on the outer surface of at least one of the panels. The luggage board is assembled so that the surface material is exposed within the luggage compartment.

[0004] Furthermore, in recent years, luggage board manufacturing methods that include a stamping process for forming the material have become increasingly popular from a productivity perspective. Therefore, in the stamping process, the following materials are arranged between two dies, and then pressurized, in order to form the layered structure described above. Specifically, a core material is sandwiched between two resin plates softened in advance by heating, and a skin material is placed on the outer surface of at least one of the resin plates. The materials thus placed are sandwiched between two molds and press-molded.

[0005] For example, in Patent Document 1, the first of two resin sheets is vacuumed into a lower mold, the lower surface of the first sheet is shaped, a core material is placed on top of the sheet, and the second sheet is then placed on top of the core material. Vacuuming is then performed from the upper mold to shape the upper surface of the second sheet, while the molds are simultaneously closed and the material between the upper and lower molds is pressurized.

[0006] However, in Patent Document 1, the skin material is pressed with the skin material interposed between the upper mold and the second resin plate. However, it is unclear how the skin material is interposed between the upper mold and the second resin plate. However, unlike other materials, the skin material is extremely soft and has low tension. Therefore, if the skin material is simply placed on the second resin plate and the mold is closed while vacuuming, the finished product is likely to have many wrinkles. Prior art literature Patent Literature

[0007] Patent Document 1: Japanese Patent No. 5603534 Summary of the Invention Technical problem to be solved by the invention

[0008] Therefore, a technical problem of the present disclosure is to suppress the generation of wrinkles on a surface material in a method for manufacturing a luggage board using stamping of the material. Means for solving technical problems

[0009] The luggage board manufactured by the manufacturing method of the present disclosure is assembled in a luggage compartment of an automobile. A core material for increasing height is arranged between two resin panels, and a skin material is arranged on the outer surface of at least one of the resin panels. The luggage board manufacturing method disclosed herein includes the following preheating and pressing steps. First, in the preheating step, two resin sheets are heated and softened. Next, in the pressing step, a main material portion with a core material disposed between the softened resin sheets is press-formed.

[0010] Furthermore, during the stamping process, the main material portion is clamped and pressurized by a mold on one side that shapes the outer surface of one of the two resin plates and a mold on the other side that shapes the outer surface of the other resin plate. Furthermore, during the stamping process, a skin material is placed in a tensioned state between at least one of the outer surface of one resin plate and the shaping surface of one mold, and between the outer surface of the other resin plate and the shaping surface of the other mold. Furthermore, during the stamping process, the skin material is maintained in a tensioned state while being pressurized together with the main material portion. The luggage board manufacturing method disclosed herein also includes the following preparatory step. Specifically, in the preparatory step, the surface material is placed in a predetermined jig, thereby applying tension to the surface material. The jig is shaped so as to surround one die and the other die from the outside, and applies tension to the surface material while holding the surface material on its inner periphery. Furthermore, during the stamping step, one of the one die and the other die is positioned below the other. Furthermore, the jig is positioned around the outer periphery of the one die and the other die with the surface material positioned thereon, so that the surface material faces the shaping surface of the one die on the inner periphery of the jig. The surface material is placed on the one die, and the jig is suspended from the one die. Subsequently, the surface material is clamped and pressurized in a suspended state, along with the main material portion, by the one die and the other die. Therefore, according to the luggage board manufacturing method of the present disclosure, even when the material is stamped, the generation of wrinkles on the surface material can be potentially suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 1 is an explanatory diagram showing the position of the luggage board in the car (Example 1). Figure 22 is a cross-sectional view showing the structure of a luggage board (Example 1). Figure 3 1 is a process diagram showing a method for manufacturing a luggage board (Example 1). Figure 4 It is a top view showing a state where a clamp holds a skin material (Example 1). Figure 5 yes Figure 4 VV cross-sectional view (Example 1). Figure 6 This is an explanatory diagram showing a state in which materials are arranged between dies in a stamping process (Example 1). Figure 7 This is an explanatory diagram showing a state where a material is pressurized during a press process (Example 1). Figure 8 2 is a structural diagram of a punching device (Example 1). Figure 9 It is an explanatory diagram showing the cooling process (Example 1). Figure 10 It is a cross-sectional view showing the structure of a luggage board (Example 2). DETAILED DESCRIPTION

[0012] The following examples further illustrate the methods for implementing the present disclosure. [Example]

[0013] [Structure of Embodiment 1] The structure of the luggage board 1 according to the first embodiment will be described. First, the luggage board 1 is a member constituting the floor surface of the luggage compartment 3 of the automobile 2. For example, it is provided as a lid for closing the luggage room 4 under the floor from above, and is provided so that the luggage room 4 can be opened by pulling up the luggage board 1 (see FIG. Figure 1 . ) In addition, the luggage compartment 3 is set behind the rear seats 5 in the interior of the automobile 2, for example.

[0014] The luggage board 1 has the following layer structure. Specifically, in the luggage board 1, a core material 10 and a reinforcing material 11 are disposed between two resin plates 9, and a skin material 12 is disposed on the opposite side of the two surfaces of one resin plate 9 to the side where the core material 10 and the reinforcing material 11 are located (see FIG. Figure 2 : Hereinafter, in the resin plate 9, the surface on the opposite side to the side where the core material 10 and the reinforcing material 11 are located may be referred to as the outer surface. ).

[0015] The core material 10 is used to increase the height of the luggage board 1, and the reinforcing material 11 is used to increase the rigidity of the luggage board 1. The surface material 12 improves the appearance, and the luggage board 1 is assembled so that the surface material 12 is exposed in the luggage compartment 3.

[0016] Here, the two resin plates 9 are, for example, both of which are filler-reinforced resin molded products in which a filler is mixed with polypropylene, and are of the same composition and thickness. In addition, various fillers such as silica, calcium carbonate, carbon fiber, and glass fiber can be used as fillers.

[0017] The core material 10 is a resin foam made of expanded polypropylene, for example, and the reinforcing material 11 is a metal body having an H-shaped cross section made of aluminum. The skin material 12 can be a nonwoven fabric made of fibers, a resin film, or the like. Next, a method for manufacturing the luggage board 1 will be described.

[0018] [Manufacturing method of embodiment 1] A method for manufacturing the luggage board 1 according to the first embodiment will be described with reference to the accompanying drawings. The manufacturing method of the luggage board 1 of the first embodiment includes the following preheating step P1, preparation step P2, stamping step P3 and cooling step P4 (refer to Figure 3 . ). First, in the preheating step P1, the two resin plates 9 are heated and softened in a heating furnace using far infrared rays.

[0019] Next, in the preparation step P2, the skin material 12 is placed on a predetermined jig 14, thereby applying tension to the skin material 12 (see Figure 4 and Figure 5 The jig 14 is shaped so as to surround the two dies 15A and 15B used in the press step P3 from the outside, and applies tension to the skin material 12 while holding the skin material 12 on its inner periphery.

[0020] More specifically, the jig 14 comprises, for example, a frame 14A and a plurality of needles 16. Specifically, the frame 14A is a rectangular ring, with its inner periphery configured to surround the molds 15A and 15B from the outside. Furthermore, three needles 16 are assembled on each side of the inner periphery of the frame 14A.

[0021] More specifically, three protrusions 14B are provided on the inner circumference of frame 14A, projecting inward. A needle 16 is secured to each protrusion 14B. Needles 16 project perpendicularly to the plane defined by the ring of frame 14A. Furthermore, all protrusions 14B are configured to accommodate molds 15A and 15B within their inner circumferential ends. Furthermore, by penetrating the vicinity of the peripheral edge of the skin material 12 , each needle 16 is allowed to apply tension to the skin material 12 while the skin material 12 is held by the jig 14 .

[0022] Next, in the stamping process P3, the various materials are clamped by the dies 15A and 15B and stamped (see Figure 6 and Figure 7 . ). Here, the punching process P3 is performed by the following punching device 18 (see Figure 8 The punching device 18 is composed of the above-mentioned molds 15A and 15B, a driving unit 18a, a control unit 18b, and the like.

[0023] First, the molds 15A and 15B are the lower and upper molds in the press device 18 . The mold 15B is assembled to face the mold 15A in the vertical direction and to be able to approach from above or move away from above relative to the mold 15A. The drive unit 18a drives the mold 15B. Various drive methods can be used, such as air drive and motor drive. The control unit 18b is, for example, a well-known control panel, which outputs various control signals to the drive unit 18a and other components to control the operation of the mold 15B.

[0024] The press device 18 then press-forms the material, for example, as follows. First, the die 15B is lifted upward relative to the die 15A, and various materials are stacked on top of the die 15A, thereby positioning the materials between the dies 15A and 15B. Next, the die 15B is lowered toward the die 15A, closing the molds and press-forming the materials.

[0025] The various materials punched and formed in the punching step P3 are a main material portion 19 having a core material 10 and a reinforcing material 11, and a skin material 12, arranged between two resin plates 9. Furthermore, these materials are arranged between molds 15A and 15B, with the skin material 12 arranged below the main material portion 19. More specifically, between molds 15A and 15B, the skin material 12, the resin plate 9 on one side, the core material 10 and the reinforcing material 11, and the resin plate 9 on the other side are arranged in this order from bottom to top.

[0026] Moreover, in the stamping process P3, the outer surfaces of the resin plates 9 located on the lower and upper sides are shaped by the shaping surfaces 15As and 15Bs of the molds 15A and 15B respectively (hereinafter, in the main material part 19 arranged between the molds 15A and 15B, the resin plates 9 located on the lower and upper sides are sometimes referred to as resin plates 9A and 9B, respectively.).

[0027] Furthermore, in the stamping step P3, the skin material 12 is maintained in a tensioned state while being stamped and formed together with the main material portion 19. Therefore, in the stamping step P3, the skin material 12 is placed in a tensioned state between the outer surface of the resin plate 9A and the shaping surface 15As. Specifically, by placing the jig 14 on the outer periphery of the molds 15A and 15B with the skin material 12 in place, the skin material 12 is brought into contact with the shaping surface 15As on the inner periphery of the jig 14. Hereinafter, the pressing step P3 will be further divided into a plurality of steps and described in sequence.

[0028] The pressing process P3 includes the following first to fourth pre-processing processes P3a to P3d and a pressurizing process P3e (see Figure 3 . ). The first to fourth pre-processing steps P3a to P3d are steps of placing two resin plates 9, core material 10, and reinforcing material 11 between molds 15A and 15B to form main material portion 19, and placing skin material 12 between main material portion 19 and mold 15A.

[0029] First, in the first pre-processing step P3a, the skin material 12 that has passed the preparation step P2 is placed in the mold 15A. That is, the skin material 12 is placed in the mold 15A (see FIG. 15A ) while being held by the clamp 14 and having tension applied thereto. Figure 4 、 Figure 5 Here, the protrusion 14B of the jig 14 is arranged so as to accommodate the molds 15A and 15B on the inner side of its inner peripheral end. Therefore, the skin material 12 is placed on the upper peripheral edge of the mold 15A, for example, and the jig 14 including the protrusion 14B is in a state of being suspended outside the mold 15A near the peripheral edge of the skin material 12.

[0030] Next, in the second pretreatment step P3b, the resin sheet 9 that has been preheated in the preheating step P1 is placed on the skin material 12 placed on the mold 15A. At this time, the resin sheet 9 softened in the preheating step P1 is placed on the skin material 12. Next, in the third pre-processing step P3 c , the core material 10 and the reinforcing material 11 are placed on the resin plate 9 placed on the skin material 12 . Then, in the fourth pretreatment step P3d, the other resin sheet 9, which has undergone the preheating step P1, is placed on the core material 10 and reinforcing material 11 placed on one resin sheet 9. At this time, the other resin sheet 9 has also been softened in the preheating step P1, and the softened resin sheet 9 is placed on the core material 10 and reinforcing material 11.

[0031] Based on the above, the main material portion 19 (see Figure 6 . ), and the skin material 12 is arranged on the lower side of the main material portion 19 and the upper side of the mold 15A. Next, in the pressurizing step P3e, the mold 15B is lowered toward the mold 15A to close the mold, thereby pressurizing the main material portion 19 and the skin material 12 to form the main material portion 19 and the skin material 12 (see FIG. Figure 7 . ).

[0032] Thus, the outer surface of resin plate 9A is shaped by shaping surface 15As along with skin material 12, while the outer surface of resin plate 9B is shaped by shaping surface 15Bs. Furthermore, the peripheral edges of resin plates 9A and 9B are welded together to form an integrated structure, with core material 10 and reinforcement material 11 fixed between resin plates 9A and 9B. Skin material 12 is also welded to the welded portions of resin plates 9A and 9B and adheres to the outer surface of resin plate 9A.

[0033] Simultaneously, in the pressurizing step P3e, the welded portions at the peripheries of the resin plates 9A and 9B and the skin material 12 are sheared by the mold clamping. Then, the mold 15B is lifted from the mold 15A to remove the integrated material of the skin material 12 and the main material portion 19 (hereinafter, the integrated material of the skin material 12 and the main material portion 19 may be referred to as an intermediate product 20).

[0034] Furthermore, in the stamping step P3, regarding the heat dissipation from the resin plate 9A to the mold 15A and the heat dissipation from the resin plate 9B to the mold 15B, the heat dissipation from the resin plate 9B to the mold 15B is greater than the heat dissipation from the resin plate 9A to the mold 15A. In other words, the amount of heat transferred per unit time from the resin plate 9B to the mold 15B is greater than the amount of heat transferred per unit time from the resin plate 9A to the mold 15A.

[0035] That is, skin material 12 is present between resin plate 9A and mold 15A, and skin material 12 has a high heat transfer resistance. Therefore, the amount of heat dissipated from resin plate 9B to mold 15B is greater than the amount of heat dissipated from resin plate 9A to mold 15A. Therefore, in the intermediate product 20 removed from molds 15A, 15B, resin plate 9B is cooled further than resin plate 9A.

[0036] Next, in the cooling step P4, the intermediate body 20 is held in a predetermined jig 22 and cooled (see Figure 9 The clamp 22 is held in the following manner: the peripheral edge of the intermediate body 20 is pressed toward one side compared to the central portion. For example, the clamp 22 includes: a concave body 22A having a concave portion 22a that becomes increasingly concave toward the center; and a convex body 22B having a convex portion 22b that becomes increasingly protruding toward the center.

[0037] Here, in the cooling process P4, regarding the heat dissipated from the resin sheets 9A and 9B to the molds 15A and 15B in the stamping process P3, the periphery of the intermediate body 20 is pressed toward the resin sheet 9B, which has a greater amount of heat dissipation, while the intermediate body 20 is held. That is, in the cooling process P4, the intermediate body 20 is held in the jig 22 such that the skin material 12 and the resin sheet 9A are positioned on the side of the concave body 22A, and the resin sheet 9B is positioned on the side of the convex body 22B. Thus, the intermediate body 20 is held so that its periphery is pressed toward the resin sheet 9B. In other words, the intermediate body 20 is held so that its periphery is pressed toward the resin sheet 9B, which cooled faster in the stamping process P3.

[0038] [Effects of Example 1] The luggage board 1 of the first embodiment is assembled in the luggage compartment 3 of the automobile 2 . A core material 10 for increasing height is disposed between two resin plates 9 , and a skin material 12 is disposed on the outer surface of one resin plate 9 . Furthermore, the method for manufacturing the luggage board 1 of the first embodiment includes the following preheating step P1 and pressing step P3.

[0039] That is, in the preheating process P1, the two resin plates 9 are heated and softened. In addition, in the stamping process P3, the main material portion 19 in which the core material 10 is arranged between the two softened resin plates 9 is stamped. In addition, in the stamping process P3, the main material portion 19 is clamped and pressurized by the mold 15A that shapes the outer surface of the resin plate 9 on one side and the mold 15B that shapes the outer surface of the resin plate 9 on the other side. Moreover, in the stamping process P3, the skin material 12 is arranged in a state of applying tension between the outer surface of the resin plate 9 on one side and the shaping surface 15As of the mold 15A, and then, the skin material 12 is maintained in a state of applying tension and is pressurized together with the main material portion 19.

[0040] Thus, even when the material is stamped, the generation of wrinkles in the skin material 12 can be potentially suppressed. That is, since the skin material 12 is held in a state of tension and is pressurized together with the main material portion 19 , the generation of wrinkles in the skin material 12 can be suppressed even when the material is formed by press forming.

[0041] The manufacturing method of the luggage board 1 of the first embodiment also includes the following preparatory step P2. Specifically, in preparatory step P2, the skin material 12 is placed on a jig 14, thereby applying tension to the skin material 12. The jig 14 is shaped so as to surround the molds 15A and 15B from the outside, and applies tension to the skin material 12 while holding the skin material 12 on its inner periphery.

[0042] Then, in the pressing step P3 , the jig 14 is arranged on the outer periphery of the dies 15A and 15B with the skin material 12 provided thereon, so that the skin material 12 faces the shaping surface 15As on the inner periphery of the jig 14 . Thereby, even during the execution of the pressing step P3, it is possible to easily continue to apply tension to the skin material 12. Therefore, the generation of wrinkles in the skin material 12 can be further suppressed.

[0043] Furthermore, according to the method for manufacturing the luggage board 1 of the first embodiment, in the pressing step P3 , the die 15A is disposed below the die 15B, and the die 15B is lowered toward the die 15A, thereby pressurizing the main material portion 19 and the skin material 12 . Thus, the skin material 12 can be press-molded while being sandwiched between the lower die 15A and the lower resin plate 9. Therefore, the position of the skin material 12 is stabilized, and the generation of wrinkles in the skin material 12 can be further suppressed.

[0044] The manufacturing method of the luggage board 1 of the first embodiment also includes the following cooling step P4. Specifically, in cooling step P4, the intermediate body 20, which includes the press-formed main material portion 19 and the skin material 12, is cooled. Furthermore, in cooling step P4, the peripheral edge of the intermediate body 20 is pressed toward the resin sheet 9B, which has a greater amount of heat dissipation, while the intermediate body 20 is held, with the peripheral edge pressed toward the resin sheet 9B, which cooled more rapidly in the press step P3. Specifically, the intermediate body 20 is held so that the peripheral edge is pressed toward the resin sheet 9B, which cooled more rapidly in the press step P3. This can suppress the occurrence of warping in the intermediate product 20 .

[0045] That is, the intermediate product 20 removed from the molds 15A and 15B is likely to warp toward the resin plate 9A, which has cooled slowly in the pressing step P3. Therefore, in the cooling step P4, the intermediate product 20 is held so that its periphery is pressed toward the resin plate 9B. This prevents the intermediate product 20 from warping.

[0046] [Structure of Embodiment 2] According to the luggage board 1 of the second embodiment, the reinforcing material 11 is a metal body with a square cross section, and is provided with aluminum as a raw material (refer to Figure 10 . ).

[0047] [Modification] The present invention can be modified in various ways without departing from the spirit of the present invention. For example, according to the manufacturing method of the luggage board 1 of the first embodiment, in the stamping step P3, the skin material 12, the resin plate 9 on one side, the core material 10 and the reinforcing material 11, and the resin plate 9 on the other side are placed in this order on the mold 15A, and then the mold 15B is lowered to perform stamping. However, the stamping method is not limited to this method.

[0048] For example, a hole for vacuum suction can be pre-set in the mold 15A, and by vacuuming, the skin material 12 and the resin plate 9 on one side can be tightly attached to the mold 15A, and then the core material 10 and the reinforcing material 11, and the resin plate 9 on the other side can be placed in sequence. In this case, by vacuuming the gap between the shaping surface 15As and the skin material 12, the outer surface of the skin material 12 and the resin plate 9A can be shaped more reliably.

[0049] Alternatively, a hole for vacuum suction may be provided in mold 15B, and by applying vacuum, the other resin sheet 9 may be brought into close contact with mold 15B, and then mold 15B may be lowered toward mold 15A to perform press molding. In this case, by applying vacuum to the gap between shaping surface 15Bs and the outer surface of resin sheet 9B, the outer surface of resin sheet 9B can be shaped more reliably.

[0050] Alternatively, holes for injecting pressurized air into the molds may be provided in either mold 15A or 15B, allowing pressurized air to be injected into the interior of intermediate body 20. In this case, the outer surfaces of skin material 12 and resin sheet 9A can be brought into closer contact with shaping surface 15As, and the outer surface of resin sheet 9B can be brought into closer contact with shaping surface 15Bs. Consequently, the outer surfaces of skin material 12, resin sheet 9A, and resin sheet 9B can be more reliably shaped.

[0051] Furthermore, in the manufacturing method of the luggage board 1 according to the first embodiment, the clamp 14 uses the pins 16 to hold the skin material 12 and apply tension. However, the configuration of the clamp 14 is not limited to this configuration. For example, a clip could be attached to the inner periphery of the frame 14A in place of the pins 16 to hold the skin material 12 and apply tension. Alternatively, a means for holding the skin material 12 and applying tension, such as the pins 16 or the clips, could be integrally provided on either the mold 15A or 15B.

[0052] Furthermore, while the luggage board 1 of Example 1 adheres the skin material 12 only to the outer surface of the resin sheet 9A, the skin material 12 may also be adhered to the outer surfaces of both resin sheets 9A and 9B. Furthermore, when adhering the skin material 12 to the outer surfaces of both resin sheets 9A and 9B, the types or bulk densities of the skin materials 12 may differ. In this case, the amount of heat dissipated from the resin sheet 9A to the mold 15A may differ from the amount of heat dissipated from the resin sheet 9B to the mold 15B, potentially leading to faster cooling of either resin sheet 9A or 9B. Therefore, in the cooling step P4, it is preferable to hold the intermediate product 20 while pressing the peripheral edge against the resin sheet 9, which dissipates heat faster.

[0053] In addition, according to the luggage board 1 of the first embodiment, both resin plates 9 are resin molded products in which fillers are mixed in polypropylene, but thermoplastic resins other than polypropylene can also be used as the base resin, for example, polyamide, polyester, etc., and polyolefins other than polypropylene can also be used.

[0054] Furthermore, in the luggage board 1 of the first embodiment, the core material 10 is a resin foam made of expanded polypropylene. However, the core material 10 may also be expanded polystyrene or a composite resin foam of polystyrene and polyolefin. Furthermore, foams such as polyvinyl chloride, polyurethane, resol-type phenolic resin, melamine resin, and epoxy resin may also be used.

[0055] In addition, according to the luggage board 1 of the first embodiment, the reinforcing material 11 is a metal body having an H-shaped cross-section, and according to the luggage board 1 of the second embodiment, the reinforcing material 11 is a metal body having a U-shaped cross-section. However, the reinforcing material 11 may also be a material having a honeycomb structure or a material subjected to embossing. Explanation of symbols

[0056] 1 Luggage board; 2 Car; 3 Luggage compartment; 9, 9A, 9B resin boards; 10 Core material; 12 Skin material; 15A Mold (mold on one side); 15B Mold (mold on the other side); 15As shaping surface (shaping surface of the mold on one side); 15Bs shaping surface (shaping surface of the mold on the other side); 19 Main material portion; P1 Preheating process; P3 Stamping process.

Claims

1. A method for manufacturing a luggage board, The luggage board is assembled in the luggage compartment of a car, and a core material for increasing height is arranged between two resin plates, and a skin material is arranged on the outer surface of at least one resin plate, and is characterized in that: have: a preheating step of heating the two resin plates to soften the two resin plates; and A stamping step is performed to stamp the main material portion having the core material disposed between two softened resin plates. In this stamping process, The main material portion is clamped and pressed by a mold on one side for shaping the outer surface of one of the two resin plates and a mold on the other side for shaping the outer surface of the other resin plate. The skin material is arranged in a state where tension is applied between at least one of the outer surface of the resin plate on one side and the shaping surface of the mold on one side and between the outer surface of the resin plate on the other side and the shaping surface of the mold on the other side. Furthermore, the skin material is kept in a state of being tensioned and pressurized together with the main material portion. Furthermore, the luggage board manufacturing method includes a preparation step of applying tension to the skin material by placing the skin material on a predetermined jig. The clamp is shaped so as to surround the mold on one side and the mold on the other side from the outside, and holds the skin material on its inner periphery while applying tension to the skin material. In the stamping process, One of the molds on one side and the mold on the other side is arranged under the other mold. The clamp is arranged on the outer periphery of the mold on one side and the mold on the other side in a state where the skin material is provided, so that the skin material is opposite to the shaping surface of the one mold on the inner periphery of the clamp, and the skin material is placed on the one mold so that the clamp is in a state of being suspended from the one mold. Next, the skin material is sandwiched and pressed together with the main material portion in a suspended state by the mold on one side and the mold on the other side.

2. The method for manufacturing a luggage board according to claim 1, wherein: In the pressing step, the main material portion and the skin material are pressurized by lowering the other die toward the one die.

3. The method for manufacturing a luggage board according to claim 1, wherein: A cooling step is provided for cooling the intermediate body including the main material portion and the skin material after the stamping step. In the stamping process, the heat dissipated from the one resin plate to the one mold and the heat dissipated from the other resin plate to the other mold is greater than the other heat dissipation. In the cooling step, the intermediate body is held while being pressed from the resin plate having a smaller heat dissipation to the mold in the pressing step toward the resin plate having a larger heat dissipation to the mold in the pressing step.

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