Coated structure and molding die for coated structure

Abstract

To provide a coated structure and a molding die for the coated structure, in which a wrinkle or looseness hardly occurs in a skin material that covers a corner part so as to roll up the corner part, the corner part being formed in a base material composed of consecutive plural plate parts.SOLUTION: A coated structure 10 is formed in a state in which an end part of a base material 11 is rolled up by a skin material 20. The base material 11 includes a first vertical wall 13A rising from one end part of a body part 12, a second vertical wall 13B rising from another end part, and a corner part 14 where the first vertical wall 13A and the second vertical wall 13B cross with each other. The skin material 20 covers an outer face of the corner part 14 and includes, in its developed state, a first extended part 21A extending from an end marginal part of the first vertical wall 13A and a second extended part 21B extending from an end marginal part of the second vertical wall 13B. A boundary part 22 of the first extended part 21A and the second extended part 21B extends in an extending direction of the corner part 14 or extends toward the inside of the end part 14 relative to the extending direction of the corner part 14.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The technology disclosed in this specification relates to a coated structure and a mold for the coated structure. [Background technology]

[0002] Conventionally, a method has been known in which a skin material is shaped by vacuum suction in a pair of molds and attached to a substrate. For example, Patent Document 1 discloses a method in which a skin material drawn down by heating using a heater or the like is pressed against a female mold, shaped into the shape of the female mold by vacuum suction, and then the female mold holding the shaped skin material is closed with a male mold on which a core material previously shaped into a predetermined shape is placed, thereby pressing the skin material onto the core material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2-167722 Summary of the Invention [Problem to be solved by the invention]

[0004] The skin material attached to the substrate in this manner has its outer periphery trimmed off, leaving only a small portion, and the remaining portion is wrapped around the back side of the substrate. Figures 12 to 14 show this process diagrammatically. As shown in Figure 12, the outer periphery excess portion 1A of the skin material 1 spreads horizontally so as to intersect with the end of the substrate 2 at the outer periphery (parting line surface) of the mold surface of the male mold 3 on which the substrate 2 is placed, and this horizontally spreading portion is cut along the dashed line in the figure, and the remaining portion is wrapped around the back side of the substrate 2 (see Figure 13).

[0005] Here, if the portion of the base material 2 in which the skin material 1 is rolled in and sandwiched between the skin material 1 on both sides is referred to as the peripheral wall 2A, when the peripheral wall 2A has a corner 4 bent in a direction intersecting the extending direction of the edge portion 2E of the base material 2 as shown in FIG. 14, a difference in circumferential length occurs between the outer surface and the inner surface of the peripheral wall 2A at the corner 4. Therefore, wrinkles and slack occur due to the excess circumferential length in the part of the skin material 1 rolled in the inside (back surface) of the corner 4. Moreover, according to the above-mentioned conventional technology, the part of the skin material 1 rolled in the corner 4 (excess part 1A) is formed in a shape that spreads in a fan shape from the corner 4 of the peripheral wall 2A in the radial direction (horizontal direction) of the base material 2 (see FIG. 14), so the difference in circumferential length at the corner 4 is very large. Therefore, there are cases where the rolled-in skin material 1 cannot be accommodated inside the corner 4, and if the skin material 1 protrudes from the end of the peripheral wall 2A, there is a risk of a gap occurring when the skin material 1 is assembled with a mating member.

[0006] The technology disclosed in this specification has been made in consideration of the above-mentioned circumstances, and aims to provide a covering structure and a molding die for the covering structure in which wrinkles and sagging are less likely to occur in the skin material that wraps around and covers corners formed in a base material composed of a plurality of continuous plate-shaped portions. [Means for solving the problem]

[0007] The technique disclosed in the present specification for solving the above-mentioned problems is a covering structure in which one surface side of a substrate constituted by a plurality of continuous plate-like portions is covered with a skin material, and an end portion of the substrate is rolled up by folding back the skin material, the substrate comprising a main body portion, a first standing wall rising from one end portion of the main body portion and constituting a part of the end portion of the substrate, a second standing wall rising from the other end portion adjacent to the one end portion of the main body portion and constituting another part of the end portion of the substrate, and the first standing wall and a corner where the second upright wall intersect, and the skin material covers an outer surface of the corner of the base material, and in an expanded state where it does not wrap around an end of the base material, it has a first extension portion extending from an end edge of the first upright wall and a second extension portion extending from an end edge of the second upright wall and connected to the first extension portion, and the boundary portion between the first extension portion and the second extension portion extends along the extension direction of the corner portion or toward the inside of the corner portion from the extension direction of the corner portion.

[0008] According to the above configuration, even when the base material has a corner bent in a direction intersecting the extending direction of the edge of the base material, the end of the skin material (first extending portion and second extending portion) that extends from the edge of the base material and folds back has a smaller difference in perimeter with the portion that covers the outside of the corner, compared to a conventional configuration in which the end spreads out widely in a fan shape on the outside of the corner. Therefore, it is possible to prevent wrinkles or sagging due to excess perimeter from occurring in the end of the skin material that is folded inside the corner.

[0009] Another technique disclosed in this specification for solving the above problem is a molding die for molding the above-mentioned covering structure, the molding die having a core die and a cavity die facing each other, the core side molding surface of the core die being convex so as to be able to fit inside the corner of the base material, the core side molding surface having a first molding surface along the first standing wall of the base material, a second molding surface along the second standing wall, and a molding surface side corner where the first molding surface and the second molding surface intersect, the cavity side molding surface of the cavity die being concave so as to conform to the core side molding surface, by clamping the mold, the base material and the skin material can be crimped while being sandwiched, and the parting line surface of the core mold comprises a first parting line surface continuing from the first molding surface and a second parting line surface continuing from the second molding surface, and a parting line surface side corner where the first parting line surface and the second parting line surface intersect extends in a direction along the extension direction of the molding surface side corner, or in a direction away from the cavity mold than the extension direction of the molding surface side corner in the opening and closing direction of the mold.

[0010] The parting line surface side corners may be set at an angle inclined outwardly by 7 degrees or more from the opening / closing direction of the mold and at an angle between the angle in the extension direction of the molding surface side corners.

[0011] According to the above-mentioned configuration, when the core mold and the cavity mold are opened to remove the covering structure, removal can be easily performed.

[0012] The cavity mold may have a cavity-side molding surface capable of vacuum-sucking the skin material into a shape conforming to the cavity-side molding surface. Effect of the Invention

[0013] According to the technology disclosed in this specification, it is possible to provide a covering structure and a molding die for the covering structure in which wrinkles and sagging are less likely to occur in the skin material that wraps around and covers a corner formed in a base material composed of a plurality of continuous plate-shaped portions. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view of a trim board member according to a first embodiment; [Diagram 2] Plan view of trim board member [Diagram 3] A cross-sectional view of an end of a trim board member. [Figure 4] FIG. 2 is a partially enlarged perspective view of a trim board member with the skin material deployed; [Diagram 5] FIG. 3 is a cross-sectional view of a molding device in an open state, showing a manufacturing process of a trim board member (a cross-sectional view of a portion corresponding to line II in FIG. 2). [Figure 6] Cross-sectional view of the molding device after forming the skin material [Figure 7] Cross-sectional view of the molding device in a clamped state [Figure 8] Partially enlarged cross-sectional view of Fig. 7 [Figure 9] FIG. 11 is a partially enlarged perspective view of a trim board member in a state where a skin material according to a second embodiment is deployed; [Figure 10] Partially enlarged cross-sectional view of the molding device in a clamped state [Figure 11] A table showing the difference between a conventional trim board member and the trim board member of the embodiment. [Figure 12] Partially enlarged cross-sectional view of a conventional molding device in a clamped state. [Figure 13] A cross-sectional view of an end of a trim board member. [Figure 14] FIG. 1 is a partially enlarged perspective view of a trim board member with a conventional skin material unfolded; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] <Embodiment 1> A first embodiment will be described with reference to Figures 1 to 8. In this embodiment, a trim board constituting a door trim for a vehicle such as an automobile, and a molding die for forming this trim board will be exemplified as a covering structure.

[0016] The trim board is formed by assembling together a number of generally flat trim board members (an example of a covering structure) 10. Fig. 1 shows one trim board member 10, which has a shallow dish shape with a convex design surface 10A side that is to be placed inside the vehicle cabin.

[0017] The trim board member 10 is formed by covering the interior surface of a plate-shaped base material 11 made of a synthetic resin material such as polypropylene or ABS with a skin material 20 (see FIG. 3). Note that the base material 11 is not limited to a synthetic resin material, and may be, for example, a mixture of a wood-based material (such as bast plant fiber such as kenaf) and a synthetic resin. The thickness of the base material 11 is about 2.5 mm.

[0018] The base material 11 includes a main body 12 that is a substantially flat, pentagonal plate and a peripheral wall 13 that rises from the outer periphery of the main body 12 toward the rear surface (outer surface of the vehicle interior). The peripheral wall 13 rises obliquely outward so as to expand in diameter from the main body 12. In this embodiment, the peripheral wall 13 rises outward at an angle of approximately 100 degrees from the plate surface of the main body 12 (see FIG. 3).

[0019] The peripheral wall 13 has a plurality of corners 14 formed by bending in a direction intersecting with the extension direction of the edge portion of the base material 11. In detail, the main body 12, which is a substantially pentagonal plate, has a first side 12A constituting one side, and a second side 12B disposed adjacent to the first side 12A and extending in a direction different from the first side 12A, and a portion of the peripheral wall 13 where a first standing wall 13A rising from the first side 12A and a second standing wall 13B rising from the second side 12B intersect is defined as one corner 14 (see FIG. 1).

[0020] The first standing wall 13A and the second standing wall 13B rise at the same angle from the main body portion 12. In the peripheral wall 13 of the trim board member 10 of this embodiment, a total of five similar corner portions 14 are formed. It can also be said that the peripheral wall 13 is composed of a plurality of flat plate-like portions (standing walls) connected together via the corner portions 14.

[0021] The skin material 20 covers the outer surfaces of the corners 14 of the base material 11, and constitutes the design surface 10A of the trim board member 10. The skin material 20 is formed of a flexible sheet-like material such as fabric, synthetic leather, or a synthetic resin sheet. The skin material 20 may be configured such that the rear surface of the sheet-like material is backed by various functional layers such as a cushion layer or a non-breathable layer.

[0022] The skin material 20 covers the interior surface of the base material 11, and is rolled up onto the back surface of the base material 11 by folding back the portions that extend from the edges of the base material 11 (see FIG. 3).

[0023] 4 is a diagram showing the skin 20 of this embodiment in an unfolded state before being rolled up on the back surface of the base material 11. In the unfolded state, the skin 20 of this embodiment has a first extending portion 21A continuing from the portion covering the first standing wall 13A of the base material 11 and extending from the edge portion of the first standing wall 13A, and a second extending portion 21B continuing from the portion covering the second standing wall 13B of the base material 11 and extending from the edge portion of the second standing wall 13B.

[0024] The first extension portion 21A and the second extension portion 21B extend in a direction along the extension direction of the first standing wall 13A and the second standing wall 13B, respectively, and are configured to be integrally connected to the adjacent extension portions (21A, 21B). The first extension portion 21A and the second extension portion 21B are each long enough to wrap around the ends of the first standing wall 13A and the second standing wall 13B, respectively, and cover the back side. The boundary portion 22 between the first extension portion 21A and the second extension portion 21B is located along the extension direction of the corner portion 14 of the peripheral wall 13 of the base material 11, that is, on the extension line of the corner portion 14. In the following, when the first extension portion 21A and the second extension portion 21B are not distinguished from each other, they are referred to as the extension portion 21.

[0025] Next, a molding device 30 for forming the above-mentioned trim board member 10 will be described. The molding device 30 of this embodiment is an apparatus that shapes the skin material 20 by vacuum suction and presses the shaped skin material 20 onto the interior surface of the base material 11 to form the trim board member 10, and Figures 5 to 6 are explanatory diagrams that diagrammatically show the general configuration of the device. Note that the up-down direction shown in each of the figures such as Figure 5 corresponds to the vertical direction, and the left-right direction shown in each of the figures corresponds to the horizontal direction.

[0026] The molding device 30 is equipped with a pair of molds 31 consisting of an upper mold and a lower mold. The mold 31 shown in Fig. 5 is in an open state in which the upper mold and the lower mold are separated from each other. Note that the mold 31 shown in Figs. 5 to 7 shows a portion corresponding to the II cross section in Fig. 1.

[0027] The lower die is a core die 32, which has a convex core-side molding surface 33 with the central portion protruding upward as a whole, and is installed with this core-side molding surface 33 facing upward. The core die 32 is a fixed die whose height position (position in the up-down direction) is fixed so that it does not move in the up-down direction (vertical direction).

[0028] The core-side molding surface 33 is shaped to conform to the back surface of the base material 11 so as to be fitted to the base material 11 from the back surface side. In detail, the core-side molding surface 33 includes a first molding surface (not shown) shaped to conform to the first standing wall 13A of the base material 11, and a second molding surface 33B shaped to conform to the second standing wall 13B and extending in a direction different from the first molding surface. The portion where the first molding surface and the second molding surface 33B intersect is a core-side corner portion (an example of a molding surface side corner portion) 34 bent in a mountain shape toward the outside. The core-side corner portion 34 is shaped to conform to the inner surface of the corner portion 14 of the base material 11.

[0029] In the core mold 32, an end face support portion 35 for supporting the end face of the base material 11 from below is formed at a position where the end face (edge ​​portion) of the base material 11 (peripheral wall 13) is disposed. The end face support portion 35 is stepped and protrudes outward in a substantially horizontal direction from the core-side molding surface 33, and the dimension of the step is set to be the same as the thickness of the base material 11 (peripheral wall 13).

[0030] The lower side of the end face support portion 35 is a parting line surface (hereinafter referred to as a core-side PL surface 36) of the core mold 32 continuing from the core-side molding surface 33. The core-side PL surface 36 has a first PL surface (not shown) continuing from the first molding surface, and a second PL surface 36B continuing from the second molding surface 33B.

[0031] The first PL surface and the second PL surface 36B extend in the direction along the first molding surface and the second molding surface 33B in the portions adjacent to the first molding surface and the second molding surface 33B, respectively, and the length is set to a dimension sufficiently longer than the step dimension of the end surface support portion 35 from the lower end of the first molding surface and the second molding surface 33B. In addition, the portion where the first PL surface and the second PL surface 36B intersect is a PL surface side corner 37 that is bent outward in a mountain shape. The PL surface side corner 37 extends along the extension direction of the core side corner 34. In other words, the inclination angle of the PL surface side corner 37 is set to be the same angle as the inclination angle of the core side corner 34.

[0032] With this configuration, when the base material 11 is placed in the core mold 32, the upper surface (cabin interior surface) of the base material 11 is flush with the core-side PL surface 36. In this embodiment, the extension dimension L (see FIG. 5) of the core-side PL surface 36 from the core-side molding surface 33 (end surface support portion 35) is set to 5 to 10 mm.

[0033] On the other hand, the upper mold is a cabinet mold 42, which has a cabinet side molding surface 43 whose central portion is recessed upwardly, and is disposed above the core mold 32 with the cabinet side molding surface 43 facing downward and facing the core side molding surface 33 of the core mold 32. The cabinet side molding surface 43 has a shape which generally follows the shape of the core side molding surface 33 of the core mold 32 described above. The cabinet mold 42 is a movable mold which is configured to be able to rise and fall in the up and down direction (vertical direction). The cabinet mold 42 also has a vacuum suction mechanism (not shown) for sucking the skin material 20 into a shape along the cabinet side molding surface 43.

[0034] The periphery of the cabinet-side molding surface 43 is a cabinet-side PL surface 46 that is shaped to fit the above-mentioned core-side PL surface 36. The dimension between the core-side PL surface 36 and the cabinet-side PL surface 46 when the molding die 31 is closed is set to be equal to or slightly smaller than the thickness of the skin material 20 (see FIG. 7).

[0035] Next, a method for manufacturing the trim board component 10 using the above-mentioned forming apparatus 30 will be described.

[0036] (The process in which the substrate is set in the core mold) The base material 11, which has been molded into a predetermined shape in advance, is set in the core mold 32 of the pair of molding dies 31 in an open state in which the core mold 32 and the cavity mold 42 are open, and the skin material 20, which has been softened by heating, is set between the pair of molding dies 31 (see FIG. 5). Note that the core-side molding surface 33 of the core mold 32 has a shape following the back surface of the base material 11 as described above, and the core-side molding surface 33 is fitted into the back surface of the base material 11.

[0037] In addition, at this time, an adhesive may be applied in advance to the upper surface (the surface inside the vehicle interior, the surface to which the skin material 20 is attached) of the base material 11 before it is set in the core mold 32. The adhesive applied to the base material 11 may be dried using a drying oven or the like, as necessary.

[0038] (The process of sucking the skin material into the cavity) Next, the cavity mold 42 is lowered to approach the softened skin material 20, and the valve of the vacuum suction mechanism is opened to suck the skin material 20 onto the cabinet side molding surface 43, thereby forming the skin material 20 into a shape that follows the cabinet side molding surface 43 (see FIG. 6). Since the skin material 20 has been heated and softened by the heating device, it easily stretches to form a shape that follows the cabinet side molding surface 43. The skin material 20 is large enough to fully cover the base material 11, and its peripheral end portion extends to the cabinet side PL surface 46.

[0039] (Mold clamping process (molding process)) Next, the pair of molding dies 31 are clamped. Figures 7 and 8 are explanatory diagrams that show the molding die 31 in a clamped state. After the skin material 20 is held in the shaped state in the cavity die 42 for a predetermined time, the cavity die 42 descends so as to approach the core die 32. Then, the molding die 31 is clamped with the cavity die 42 and the core die 32 fitting together while the base material 11 and the skin material 20 are sandwiched between them in an overlapping state.

[0040] When the mold is closed, the base material 11 and the skin material 20 are sandwiched between the cabinet side molding surface 43 and the core side molding surface 33. As a result, the skin material 20 is pressed against the upper surface (interior surface) of the base material 11 without any gaps. Thereafter, the molding die 31 is opened, whereby the skin material 20 is attached to the interior surface of the base material 11, and the molded product in which the excess portion (extension portion 21) of the skin material 20 extends from the end portion of the base material 11 is taken out (demolded).

[0041] (Trimming process) Next, the excess portion (extending portion 21) of the skin material 20 is trimmed in the portion corresponding to the dashed line in Fig. 8. At this time, the skin material 20 is cut at a position about 5 mm away from the edge portion of the base material 11. Fig. 4 shows a part of the skin material 20 and the base material 11 in the cut state.

[0042] (Rolling process) Finally, the extension 21 of the skin 20 extending from the end of the base material 11 is folded back onto the back surface of the base material 11. At this time, the extension 21 of the skin 20 is configured so that the difference in perimeter between it and the portion covering the outside of the corner 14 is smaller than in the conventional configuration in which the extension 21 spreads out widely in a fan shape outside the corner 14. Therefore, it is possible to prevent the extension 21 of the skin 20 that is folded inside the corner 14 from wrinkling or sagging due to excess perimeter.

[0043] Next, the effects of the present embodiment will be described. In this embodiment, the interior surface of the vehicle interior of the base material 11, which is made up of a plurality of continuous plate-like portions, is covered with the skin material 20, and the end portion of the base material 11 is rolled up by folding back the skin material 20. The base material 11 is made up of a main body portion 12, a first standing wall 13A rising from one end portion of the main body portion 12 and constituting a part of the end portion of the base material 11, a second standing wall 13B rising from the other end portion adjacent to the one end portion of the main body portion 12 and constituting another part of the end portion of the base material 11, and a first standing wall 13C rising from the other end portion adjacent to the one end portion of the main body portion 12 and constituting a part of the end portion of the base material 11. The skin material 20 is configured to include a corner 14 where the vertical wall 13A and the second vertical wall 13B intersect, and covers the outer surface of the corner 14 of the base material 11. In an unfolded state in which the end of the base material 11 is not wrapped around, the skin material 20 has a first extension portion 21A extending from the edge portion of the first vertical wall 13A and a second extension portion 21B extending from the edge portion of the second vertical wall 13B and connected to the first extension portion 21A, and the boundary portion 22 between the first extension portion 21A and the second extension portion 21B extends along the extension direction of the corner 14.

[0044] According to the above configuration, even when the base material 11 has a corner 14 bent in a direction intersecting the extending direction of the edge of the base material 11, the ends (first extending portion 21A and second extending portion 21B) of the skin material 20 extending from the edge of the base material 11 and folded back have a smaller difference in perimeter with the portion covering the outside of the corner 14, compared to a conventional configuration in which the ends spread out widely in a fan shape outside the corner 14. Therefore, it is possible to prevent the end of the skin material 20 that is folded inside the corner 14 from being wrinkled or slackened due to excess perimeter.

[0045] The mold of this embodiment has a core mold 32 and a cavity mold 42 facing each other, and the core side molding surface 33 of the core mold 32 is convex so as to be able to fit inside the corner 14 of the base material 11, and has a first molding surface along the first standing wall 13A of the base material 11, a second molding surface 33B along the second standing wall 13B, and a core side corner 34 where the first molding surface and the second molding surface 33B intersect. 3 is concave to conform to the core side molding surface 33, and by clamping the core mold 32 and the cavity mold 42 together, the base material 11 and the skin material 20 can be clamped together, and the core side PL surface 36 has a first PL surface continuing from the first molding surface and a second PL surface 36B continuing from the second molding surface 33B, and the PL surface side corner 37 where the first PL surface and the second PL surface 36B intersect extends along the extension direction of the core side corner 34.

[0046] Further, the cavity side molding surface 43 of the cavity mold 42 is capable of vacuum-sucking the skin material 20 into a shape that conforms to the cavity side molding surface 43 .

[0047] <Embodiment 2> Next, a second embodiment will be described with reference to Figures 9 and 10. In the following, only configurations different from the first embodiment will be described, and configurations similar to those in the first embodiment will be given the same reference numerals or reference numerals obtained by adding 100 to the reference numerals in the first embodiment, and duplicated descriptions will be omitted.

[0048] The trim board component 110 of this embodiment differs from the first embodiment in the extending direction of the extending portion 121 of the skin material 120 in the developed state and in the extending direction of the PL surface of the mold.

[0049] 9 is a diagram showing the skin 120 of this embodiment in an unfolded state before being rolled up on the back surface of the base material 11. In the unfolded state, the skin 120 of this embodiment has a first extending portion 121A continuing from the portion covering the first standing wall 13A of the base material 11 and extending from the edge portion of the first standing wall 13A, and a second extending portion 121B continuing from the portion covering the second standing wall 13B of the base material 11 and extending from the edge portion of the second standing wall 13B.

[0050] The first extending portion 121A and the second extending portion 121B extend radially inwardly of the base material 11 from the extending direction of the first standing wall 13A and the second standing wall 13B, respectively. As a result, the boundary portion 122 between the first extending portion 121A and the second extending portion 121B extends further inwardly from the corner portion 14 of the peripheral wall 13 of the base material 11 than the extending direction of the corner portion 14.

[0051] The first and second PL surfaces of the core mold 132 of this embodiment for molding such a skin material are inclined downward away from the cavity mold 142 in the portions adjacent to the first and second molding surfaces, respectively, from the direction in which the first and second molding surfaces extend. FIG. 10 is a cross-sectional view of a PL surface side corner 137 where the first and second PL surfaces intersect, and the PL surface side corner 137 is set at an angle of θ=7 degrees outward from the vertical direction (the up-down direction in FIG. 10, the opening and closing direction of the core mold 132 and the cavity mold 142). In other words, the first side PL surface and the second PL surface are lowered at an angle (close to the vertical) smaller than the inclination angle (10 degrees) of the first and second molding surfaces from the vertical direction. Note that 7 degrees is the minimum pull angle at which the trim board member 10 molded by the molding mold can be easily pulled out.

[0052] In this manner, by setting the angle of PL surface side corner 137 at an angle inclined outward by 7 degrees or more from the opening / closing direction (vertical direction, up-down direction) of molding die 131 and at an angle between the extension direction of molding surface side corner 134, it is possible to further reduce the difference in circumference between extension portion 121 of skin material 120 and the portion covering the outer periphery of corner 14, thereby further preventing wrinkles or sagging due to excess circumference from occurring in the portion of skin material 120 that is wrapped around the inner periphery of corner 14.

[0053] Furthermore, by setting the inclination angle of the PL surface side corner 137 to an angle of 7 degrees outward from the opening and closing direction of the molding die 131, demolding can be easily performed when the core die 132 and the cavity die 142 are opened and the trim board component 10 is demolded.

[0054] 11 shows a conventional trim board member, a photograph of the corner 14 of the trim board members 10, 110 of the first and second embodiments as viewed from outside the vehicle cabin, and a table showing a cross-sectional view of the molding dies 31, 131 in a clamped state. As shown in Fig. 11, compared to the conventional trim board member in which the skin material that spreads out in a fan shape on the outside of the corner is folded back to the inside of the corner, in the trim board members of the first and second embodiments, wrinkles and sagging of the skin material are significantly improved, and therefore the skin material can be contained within the corner without protruding from the corner.

[0055] <Other embodiments> The technology disclosed in this specification is not limited to the embodiments described above and illustrated in the drawings, and for example, the following embodiments are also included within the technical scope.

[0056] (1) The inclination angle of the PL surface side corner is not limited to the above embodiment and can be set as appropriate as long as it is an angle that is inclined outward by 7 degrees or more from the opening and closing direction of the mold and is an angle between the direction in which the molding surface side corner extends.

[0057] (2) In the above embodiment, the skin material 20 is molded into a shape conforming to the interior surface of the base material 11 by a female drawing vacuum forming method. However, the skin material may be pressed against the base material by a pair of molds without being shaped by vacuum suction.

[0058] (3) In the above embodiment, a trim board member 10 constituting a door trim for a vehicle is used as an example of a covering structure. However, the technology disclosed in this specification is not limited to trim board members for door trim, and can be applied with various modifications to other vehicle interior materials such as pillar garnishes, ceiling materials, console boxes, dashboards, various instrument panels, deck trim, etc., as well as vehicle interior materials for trains, airplanes, ships, etc., and applications other than vehicle interior materials. [Explanation of symbols]

[0059] 10, 110: trim board member (covering structure), 11: base material, 12: main body, 13: peripheral wall, 13A: first standing wall, 13B: second standing wall, 14: corner portion, 20, 120: skin material, 21A, 121A: first extension portion, 21B, 121B: second extension portion, 22, 122: boundary portion, 30: molding device, 31, 131: molding die, 32, 132: core die, 33: core side molding surface, 3 3B: second molding surface, 34, 134: core side corner (molding surface side corner), 36: core side PL surface (parting line surface of the core mold), 36B: second PL surface (second parting line surface), 37, 137: PL surface side corner (parting line surface side corner), 42, 142: cavity mold, 43: cavity side molding surface, 46: cavity side PL surface (parting line surface of the cavity mold)

Claims

1. A covering structure in which one surface side of a base material composed of a plurality of continuous plate-shaped portions is covered with a skin material, and an end portion of the base material is rolled up by folding back the skin material, the base material includes a main body portion, a first standing wall rising from one end of the main body portion and constituting a part of the end of the base material, a second standing wall rising from the other end adjacent to the one end of the main body portion and constituting another part of the end of the base material, and a corner portion where the first standing wall and the second standing wall intersect, the skin material covers an outer surface of the corner portion of the base material, and in a deployed state in which the end portion of the base material is not rolled in, the skin material has a first extending portion extending from an edge portion of the first standing wall, and a second extending portion extending from an edge portion of the second standing wall and continuing to the first extending portion, A covering structure, wherein a boundary portion between the first extension portion and the second extension portion extends along the extension direction of the corner portion, or extends toward the inside of the corner portion from the extension direction of the corner portion.

2. A mold for molding the covering structure according to claim 1, A core mold and a cavity mold opposed to each other, a core-side molding surface of the core mold is convex so as to be able to fit into the inside of the corner of the base material, and has a first molding surface along the first standing wall of the base material, a second molding surface along the second standing wall, and a molding surface side corner portion where the first molding surface and the second molding surface intersect, The cavity mold has a cavity-side molding surface that is concave to conform to the core-side molding surface, The core mold and the cavity mold are clamped together to sandwich and press the base material and the skin material together. the parting line surface of the core mold includes a first parting line surface continuing from the first molding surface and a second parting line surface continuing from the second molding surface, A molding die for a covering structure, wherein a parting line surface side corner where the first parting line surface and the second parting line surface intersect extends in a direction along the extension direction of the molding surface side corner, or in a direction away from the cavity mold than the extension direction of the molding surface side corner in the opening and closing direction of the molding die.

3. The molding die for a covering structure as described in claim 2, wherein the parting line surface side corner is set at an angle inclined outwardly by 7 degrees or more from the opening and closing direction of the molding die, and at an angle between the opening and closing direction and the extending direction of the molding surface side corner.

4. 4. The mold for a covering structure according to claim 2, wherein a molding surface of the cavity mold on a cabinet side is capable of vacuum-sucking the skin material into a shape conforming to the molding surface on the cabinet side.

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