JP5898567B2 - Hollow structure manufacturing method, manufacturing apparatus, and end face sealing structure - Google Patents

Description

  The present invention relates to a method for manufacturing a hollow structure, a manufacturing apparatus, and an end face sealing structure.

  Conventionally, a hollow structure formed using a thermoplastic resin has been used in various fields. This hollow structure is formed by using a plate material in which resin sheets are attached to both sides of the upper and lower surfaces of a resin core having a hollow structure, and appropriately processing the plate material to form a predetermined shape.

  In such a hollow structure, when the resin core is exposed at the end face, not only the appearance is bad, but also the problem that dust accumulates in the hollow part of the cross section, the problem that water enters from the cross section, and the touch There is a problem of being bad.

  On the other hand, Patent Document 1 describes that end surface processing is performed so that the internal hollow structure is not exposed. In this end face treatment, as shown in FIG. 6, the plate material 204 is clamped by the upper and lower molding dies 200, 202, and at this time, the end portion of the plate material 204 is crushed.

JP-A-8-258133

  However, according to the end face treatment described above, the portion 206 crushed by the upper and lower molds 200 and 202 protrudes into a rib shape at the end of the molded hollow structure. When this rib-shaped portion 206 is cut, the cut end is formed on the end surface of the hollow structure. Therefore, in the above-mentioned end surface treatment, there is a problem that the end surface of the hollow structure is difficult to be formed smoothly.

  This invention is invented in view of the said problem, Comprising: It makes it a subject to provide the hollow structure which has the resin core of a hollow structure as what the end surface was sealed smoothly.

  In order to solve the above problems, the present invention is a method for manufacturing a hollow structure having the following configuration.

In other words, the present invention uses a thermoplastic resin plate material having a resin sheet or a resin plate on both sides of a resin core having a hollow structure, and presses it with a first mold and a second mold to obtain a predetermined hollow The first mold has a recess for vacuum forming, and a concave curved surface that smoothly connects both sides to the boundary between the inner bottom surface and the inner peripheral surface is formed in the recess. The second mold has a convex part for vacuum forming that enters the concave part of the first mold, and a plate material is set between the first mold and the second mold, and the set plate material is heated. Then, the heated plate material is evacuated by both the first die and the second die, and pressed until the convex portion of the second die enters the concave portion of the first die by a predetermined dimension. a resin sheet or a resin sheet on one surface side, by bending along the recess of the first die, a sealing portion for sealing the end face of the hollow structure And shape, the cut surface of the sealing portion, characterized in that provided as being formed on the other surface of the hollow structure.

  Moreover, in order to solve the said subject, let this invention be a manufacturing apparatus of the hollow structure provided with the following structure.

That is, the present invention uses a thermoplastic resin sheet on both sides of the resin core having a resin sheet or a resin plate having a hollow structure, an apparatus for producing a predetermined hollow structure, a recess for vacuum forming A first mold having a second mold having a convex part for vacuum forming that enters the concave part of the first mold , and a heater mechanism for heating the plate material. A concave curved surface that smoothly connects both sides is formed at the boundary between the inner surface and the inner peripheral surface, and the plate set between the first mold and the second mold is heated by a heater mechanism, and the heated plate is Then, while evacuating in both the first mold and the second mold, press until the convex part of the second mold enters the concave part of the first mold by a predetermined dimension, and the resin sheet or resin on the one side of the plate material the plate, by bending along the recess of the first die, a sealing portion for sealing the end face of the hollow structure And shape, the cut surface of the sealing portion, characterized in that provided as being formed on the other surface of the hollow structure.

  Moreover, in order to solve the said subject, let this invention be the end surface sealing structure of the hollow structure provided with the following structure.

That is, the present invention is an end face sealing structure of a hollow structure made of a thermoplastic resin having a resin sheet or a resin plate on both sides of a resin core having a hollow structure, and is an end portion of the resin sheet or resin plate on one side. Is smoothly bent, and the end portion constitutes a sealing portion that seals the end surface of the hollow structure, and the cut surface of the sealing portion is provided on the other surface side of the hollow structure , The hollow structure of the core has a honeycomb shape and is configured to have a softening temperature lower than that of the resin sheet or resin plate, and the hollow of the resin core is buried in the vicinity of the sealing portion of the hollow structure. It is characterized in that a resin reservoir is formed .

  The present invention has an effect that a hollow structure having a hollow resin core can be provided as one having an end surface smoothly sealed.

It is sectional drawing of the manufacturing apparatus of the hollow structure of one Embodiment of this invention. (A)-(d) is sectional drawing for demonstrating in order the process of manufacturing a hollow structure using the manufacturing apparatus same as the above. (A) is the principal part enlarged view of FIG.2 (d), (b) is the principal part enlarged view of Fig.3 (a) further. (A)-(d) is a perspective view for demonstrating in order the process which manufactures a board | plate material. It is a principal part perspective view of the hollow structure manufactured with the manufacturing apparatus same as the above. It is sectional drawing of the conventional manufacturing apparatus.

  The present invention will be described based on embodiments shown in the accompanying drawings.

  In FIG. 1, the manufacturing apparatus of the hollow structure of one Embodiment of this invention is shown. As shown in the drawing, the manufacturing apparatus according to the present embodiment includes a vacuum mold including an upper mold 4 that is a first mold 2 that can be evacuated and a lower mold 8 that is also a second mold 6 that can be evacuated. Type device. In this embodiment, as will be described later, vacuuming is performed from both sides of the upper mold 4 and the lower mold 8, but vacuuming may be performed only from one side, or only one of the upper mold 4 and the lower mold 8. It is good also as a structure which can be evacuated.

  The upper mold 4 and the lower mold 8 are provided with guide bushes (not shown) on one of the upper mold 4 and the lower mold 8 as a guide mechanism for accurately guiding the approach and separation between the molds 4 and 8. On the other side, guide pins (not shown) that are slidably fitted on the guide bushes on a one-to-one basis are provided on the other side. By providing this guide mechanism, a minute clearance C described later is precisely controlled.

  The lower die 8 has a convex portion 16 for vacuum forming at the central portion of the upper surface facing the upper die 4. In this embodiment, the front end surface of this convex part 16 is a flat surface, and the outer peripheral surface of the convex part 16 is formed vertically. The dimensional shape of the tip surface of the convex portion 16 can be appropriately designed according to the type of the hollow structure 100 to be molded, and may be a curved surface instead of a flat surface.

  A surface 18 that is one step lower than the convex portion 16 is formed at a position surrounding the central convex portion 16 on the upper surface of the lower mold 8. Above this surface 18, a holding plate 20, which is a holding structure for setting the flat plate material 22 in a predetermined position and posture, is provided. The holding plate 20 is formed in a concave shape into which the plate material 22 can be fitted from above, and has a through hole in the center. In a plan view, the through hole is formed in a substantially rectangular shape, and the tip portion of the convex portion 16 is formed in a substantially rectangular shape that is slightly smaller than the through hole. Therefore, a rectangular annular escape hole 24 is formed between the peripheral edge of the through hole of the holding plate 20 and the outer peripheral surface of the convex portion 16.

  The holding plate 20 is set so that the lower surface of the plate 22 fitted therein is the same or substantially the same height as the tip surface of the convex portion 16 (see FIG. 2 and the like). The plate material 22 may be set so that the lower surface of the plate material 22 is above the tip surface of the convex portion 16, or the lower surface of the plate material 22 is below the tip surface of the convex portion 16. A structure in which the plate material 22 is set so as to be (that is, the tip portion of the protrusion 16 bites into the lower surface of the plate material 22) may be adopted. The holding plate 20 is provided with a long plate-like clamp plate 26 so as to be rotatable at a plurality of positions as a clamp mechanism for pressing the peripheral portion of the plate member 22 fitted therein from above.

  The upper die 4 has a concave portion 30 for a molded product in the central portion of the lower surface facing the lower die 8. In the present embodiment, the inner bottom surface 32 and the inner peripheral surface 34 of the recess 30 are flat surfaces, and the boundary portion between the inner bottom surface 32 and the inner peripheral surface 34 is a concave curved surface that smoothly connects both the surfaces 32 and 34. The inner peripheral surface 34 of the recess 30 is formed vertically at least in the vicinity of the opening. The dimensional shape of each surface is appropriately designed according to the type of hollow structure 100 to be molded. For example, the inner peripheral surface 34 of the recess 30 may be formed to have a complicated three-dimensional shape by combining a flat surface and a curved surface, or may be formed to have a three-dimensional shape having only a curved surface. Moreover, you may form the whole inner surface of the recessed part 30 with a curved surface.

  An annular ridge 36 is formed at a location surrounding the recess 30 in the lower surface of the upper mold 4. In other words, an annular ridge 36 that projects downward from the periphery is formed on the lower surface of the upper mold 4, and the recess 30 for a molded product is formed by surrounding the ridge 36 around the ridge 36. . The protruding portion 36 has a dimensional shape to be inserted into the escape hole 24 through a minute clearance C (see FIG. 3B) as a dimensional shape of the tip portion.

  Further, in the manufacturing apparatus of the present embodiment, a heating plate (not shown) is provided as a heater mechanism for heating the plate material 22 set on the holding plate 20. The heating panel is configured such that the upper die 4 is retracted upward and the lower die 8 is retracted downward, the position between the plate 22 set on the holding plate 20 and the upper die 4, and the plate 22 It is slid from the side to the position between the lower mold 8. After the heating from the upper and lower sides of the plate material 22 is completed, the heating panel is slid sideways again.

  The plate material 22 used for forming the hollow structure 100 has the following structure.

  That is, the plate material 22 is formed in the steps shown in FIGS. First, as shown in FIG. 4A, vacuum forming is performed on a polypropylene sheet 40, and multiple rows of half honeycomb webs 42 are formed on the sheet 40. Next, as shown in FIG. 4B, the sheet 40 is folded in one direction so that each half honeycomb web 42 stands, and the adjacent half honeycomb webs 42 are in close contact with each other to form a continuous honeycomb structure. Combine as you like. At this time, the straight flat portions 44 formed between the adjacent half honeycomb webs 42 are alternately arranged on the one surface side and the other surface side. Adjacent flat portions 44 are in close contact with each other to form a continuous skin surface. Here, as shown in FIG. 4C, by adhering adjacent flat portions 44 to each other, a honeycomb-shaped resin core 46 in which hollow hexagonal columns are arranged in parallel is formed.

  Next, as shown in FIG. 4 (d), a polypropylene resin sheet 48 is laminated on the skin surface on one side and the other side formed on the resin core 46. The resin core 46 and the resin sheet 48 are preferably the same material from the viewpoint of bonding strength, but a thermoplastic resin sheet other than polypropylene may be used as the resin sheet 48. The plate material 22 used in the present embodiment is formed as described above, and becomes a plate material having a structure in which a resin core 46 forming a hollow structure layer is sandwiched by a pair of resin sheets 48 from both sides in the thickness direction. Therefore, the plate material 22 has very high strength per unit weight, is excellent in mechanical properties and isotropic, and is excellent in secondary workability because it is made of a thermoplastic resin. In addition, a non-woven fabric or a fiber sheet may be further pasted on the resin sheet 48, or a non-woven fabric or a fiber sheet may be pasted instead of the resin sheet 48. Further, a resin plate made of a thermoplastic resin may be used instead of the resin sheet 48, and the resin plate may be provided so as to be integrally formed on both sides of the resin core 46.

  When the hollow structure 100 is formed by the manufacturing apparatus of the present embodiment based on the plate material 22, the plate material 22 is set to a predetermined size and shape (here, rectangular in plan view) so as to be set in the holding plate 20. Use one that has been cut. A cut end of the resin core 46 is exposed at the end surface of the plate member 22.

  Next, the process for manufacturing the hollow structure 100 using this board | plate material 22 is described based on FIG. 2, FIG.

  As schematically shown in FIG. 2A, a plate material 22 cut into a flat plate shape is fitted and set in the recessed step portion of the holding plate 20. The plate material 22 is preheated for a predetermined time in advance using an appropriate heating device such as a preheating furnace. After the plate material 22 is fitted and set, the plurality of clamp plates 26 are respectively rotated, and each clamp plate 26 is applied to the peripheral portion of the upper surface of the plate material 22, thereby holding the peripheral portion of the plate material 22. The clamping of the plate material 22 here is temporary fixing that prevents the plate material 22 from falling and allows the plate material 22 to move somewhat during vacuum forming described later. When the plate member 22 is fixed so as not to move, the resin sheet 48 of the plate member 22 is stretched and becomes too thin, and there is a possibility that the impact strength and the like may be reduced. It is prevented that 48 etc. are extended and become too thin locally. However, even if the plate 22 is fixed so as not to move with a clamp, molding is possible.

  After setting the plate material 22 in this way, the heating board is slid from the side to a position in the vicinity of the plate material 22, and the plate material 22 is further heated for a certain period of time by the heat of the heating board. The main heating here is performed at a higher temperature and in a shorter time than the preheating. In other words, the preheating is performed at a low temperature for a long time, and by this preheating, the plate material 22 can be softened as a whole until it reaches each hollow portion of the resin core 46.

  In the present embodiment, a heating panel is provided as a heater mechanism for heating the plate member 22, but it may be heated by another mechanism. In addition, the preheating is performed before the main heating, but the preheating step can be omitted.

  When the main heating is completed, the heating plate is retracted from between the lower mold 8 and the upper mold 4, and then the upper mold 4 is lowered and the lower mold 8 is raised as shown in FIGS. 2 (b) to 2 (d). To make them approach each other. At this time, evacuation is performed from both the lower mold 8 and the upper mold 4 through a vacuum hole or a vacuum split surface. By vacuuming from both sides, it is possible to prevent wrinkles and the like on the surface of the plate material 22 during molding, but it is also possible to perform vacuuming only on one side. It is preferable to provide a larger number of vacuum holes in the bent part than the flat part of the lower mold 8 or the upper mold 4, and it is particularly preferable to arrange the vacuum holes in the vicinity of the bent part. By arranging the vacuum holes in this way, the plate material 22 can be easily formed along the mold. For example, it is preferable to arrange the vacuum holes at a location near the corner of the hollow structure 100 in a plan view or a location near a curved portion of the outer peripheral edge of the hollow structure 100 in a side view.

  When the upper die 4 is lowered, the tip of the rectangular annular ridge portion 36 of the upper die 4 is first pressed against the plate material 22 set on the holding plate 20. A relief hole 24 that is formed in a rectangular ring shape between the through hole of the holding plate 20 and the convex portion 16 is positioned directly below the protrusion portion 36. For this reason, the portion of the plate material 22 against which the protruding portion 36 is pressed is a lower space through the escape hole 24 (that is, the space around the convex portion 16 and above the surface 18 that is one step lower than the convex portion 16). It will be pushed out.

  The depth dimension of the recess 30 of the upper mold 4 is set slightly larger than the thickness dimension of the plate material 22, but the depth dimension of the recess 30 is set slightly smaller than the thickness dimension of the plate material 22. It is also possible to set the same. The opening shape of the concave portion 30 is provided in a size that is larger by a minute clearance C (for example, 0.3 mm) over the entire circumference than the outer peripheral edge of the tip portion of the convex portion 16 of the lower mold 8.

  Therefore, as shown in FIG. 2 (d) and FIG. 3, a state in which the tip end portion of the convex portion 16 is fitted into the concave portion 30 by a predetermined dimension d (for example, about 3 mm), that is, the ridge portion 36 of the upper mold 4. In a state where the convex portion 16 of the lower mold 8 and the convex portion 16 of the lower mold 8 overlap each other by a predetermined dimension d, the plate material 22 is vacuum-formed into a predetermined shape between the concave portion 30 of the upper mold 4 and the convex portion 16 of the lower mold 8. Is done. A portion formed between the concave portion 30 and the convex portion 16 in the plate member 22 becomes a product portion of the hollow structure 100, and the other portion of the plate member 22 becomes a loss portion.

  That is, the loss portion is a portion 52 that is pushed out to the space below through the escape hole 24 and a peripheral portion 54 of the plate member 22 that remains between the clamp plate 26 and the holding plate 20. The product portion and the loss portion are connected only through the thin piece 56 formed in the minute clearance C portion at the time of clamping. The thin piece 56 is formed as a rectangular annular thin portion having a thickness corresponding to the minute clearance C.

  The plate material 22 vacuum-formed in this way is taken out of the holding plate 20 by raising the upper mold 4 after cooling for a certain period of time, and rotating the clamp plate 26 of the holding plate 20 to release the clamping. If the thin piece 56 is cut out of the plate material 22 taken out, the remaining product portion becomes the desired hollow structure 100. The resin sheet 48 of the plate member 22 has a thickness of about 1 mm, but the thin piece 56 is formed so as to be thinner than the resin sheet 48, so that cutting is easy.

  As shown in FIG. 5, in the molded hollow structure 100, the edge portion of the upper resin sheet 48, which is one surface side of the hollow structure 100, is included in the recess 30 of the upper mold 4. A sealing portion 58 is formed that is bent downward by the circumferential surface 34 or a concave curved surface in the vicinity thereof and seals the side end surface of the hollow structure 100 over the entire circumference. And the position where the cut surface 60 of the sealing portion 58 formed by the edge of the upper resin sheet 48 is flush with the lower resin sheet 48 on the other surface side of the hollow structure 100, or slightly smaller than this. It is formed at a position protruding downward. Therefore, the sealing part 58 is smoothly formed over the entire circumference, and the product looks and feels good.

  The shape of the sealing portion 58 at the outer peripheral edge of the hollow structure 100 can be freely designed according to the shape of the upper mold 4 and the lower mold 8. In the present embodiment, the outer peripheral edge of the hollow structure 100 is formed by straight portions that form four sides, but shapes in which the straight portions and the curved portions are variously combined can be employed. Further, in the present embodiment, the sealing portion 58 in which the upper corner portion is smoothly curved is formed over the entire circumference of the outer peripheral edge of the hollow structure 100 to be a product. It is also possible to form the sealing part 58 only on the part and seal the other part (straight line part) with a hot blade after molding. Depending on the type of the hollow structure 100, it is also possible to form a sealing portion 58 on a part of the outer peripheral edge and not seal the other parts.

  Further, the height of the sealing portion 58 is not limited to be uniform, and may be a structure in which a high portion and a low portion are combined, or even if the curvature radius of the curved portion of the sealing portion 58 is not uniform. Good. The sealing portion 58 may have a structure in which the height and the radius of curvature are different on each side of the outer periphery of the hollow structure 100. For example, a portion having a large curvature radius and a portion having a small curvature radius at the upper corner portion may be formed on the outer peripheral edge of the hollow structure 100, thereby forming a three-dimensional shape having a rounded portion and an angular portion. Is possible.

  Moreover, in this embodiment, although the sealing part 58 is formed only in the outer periphery of the hollow structure 100, when the hollow structure 100 is a structure which has a hole, it is the same at the periphery of the hole. It is also possible to form the sealing portion 58.

  In this embodiment, a single hollow structure 100 is formed between the upper mold 4 and the lower mold 8, but a plurality of hollow structures 100 are molded between the pair of molds 4 and 8. It may be provided. In this case, the sealing portion 58 can be formed at the boundary portion between the hollow structures 100 adjacent between the pair of molds 4 and 8.

  In the vicinity of the end face of the hollow structure 100 thus molded, a resin reservoir is formed so as to fill the hollow of the resin core 46. In particular, when the resin core 46 has a honeycomb shape, the hollow portions in which the resin accumulates are uniform and convenient. Thereby, there exists an advantage that the welding strength and collision strength of the edge part of the hollow structure 100 improve further. In particular, since the resin core 46 and the resin sheet 48 that are crushed so as to generate a resin pool are firmly integrated in the curved portion of the sealing portion 58, high impact strength can be obtained. In order to seal the end face more securely, the softening temperature of the resin core 46 is configured to be lower than the softening temperature of the resin sheet 48, and the resin core 46 is more easily softened even when heated at the same temperature. Is preferred. For example, the resin core 46 may be formed of homopropylene or block polypropylene, and the resin sheet 48 may be formed of random polypropylene so that the softening temperatures may be different. Alternatively, the resin core 46 may be formed of polyethylene, and the resin sheet 48 may be formed of polypropylene. The softening temperature may be made different by making the resin core 46 and the resin sheet 48 different materials.

  In the present embodiment, as described above with reference to FIG. 4, the resin core 46 having a honeycomb structure is formed by folding the sheet 40 in one direction so that the multiple rows of half honeycomb webs 42 rise in order, and this resin is formed. A resin sheet 48 is attached to the core 46. Therefore, in the sealing part 58 formed along the direction orthogonal to the folding direction (left and right direction in FIG. 4), the resin sheet 48 forming the sealing part 58 and the resin core 46 are integrated. The structure is such that the strength is obtained without being easily damaged.

  It is also possible to complete the manufacturing process by cutting the product portion and the loss portion of the plate material 22 in the mold. In this case, the vacuum in the mold can be reduced by setting the minute clearance C to be smaller (that is, smaller than 0.3 mm), to be set to zero clearance, or by setting the pressing force of the upper mold 4 more strongly. Cutting at the same time as molding becomes possible.

  In addition, cutting within the mold is possible by setting the upper mold 4 to be pushed in two stages. In this case, the thin piece 56 is formed by the first pushing, and when the thin piece 56 is hardened by cooling, the upper mold 4 is further pushed to cut the thin piece 56 so as to be pushed through the mold.

  It is also possible to provide a blade that can move in the horizontal direction in the mold, and use this blade to cut the thin piece 56 in the mold.

  Further, the plate material 22 may be formed by attaching a stretched resin sheet 48 (stretched sheet) to the resin core 46. In this case, there exists an advantage that the thin piece 56 formed in the edge of the extending direction of the resin sheet 48 becomes easier to cut | disconnect in a type | mold.

  As described above with reference to the drawings, the method for manufacturing the hollow structure 100 of the present embodiment has the following configuration.

  That is, in the manufacturing method of the hollow structure 100 of the present embodiment, the thermoplastic resin resin cores 46 having a hollow structure are formed by sticking the thermoplastic resin sheets 48 on both sides in the thickness direction. A thermoplastic plate material 22 is used. You may use the board | plate material 22 which shape | molded the resin board integrally on the both sides of the resin core 46. FIG. A predetermined hollow structure 100 is manufactured by hot-pressing the plate material 22 in a mold. Specifically, the first mold 2 (upper mold 4) having a vacuum forming recess 30 in the central portion, and the second mold having a vacuum forming convex portion 16 paired with the recess 30 in the central portion. A plate 22 having been preheated is set between the mold 6 (lower mold 8). A heating plate forming a heater mechanism is brought close to the set plate material 22 so that the plate material 22 is heated. Then, the vacuum is applied to at least one of the first mold 2 and the second mold 6 that are vacuum molds, and the convex portion 16 enters the concave portion 30 with a minute clearance C or zero clearance. The first mold 2 and the second mold 6 are brought close to each other until a predetermined dimension d is inserted through the plate 2, and the plate material 22 is pressed between the molds 2 and 6. At this time, the resin sheet 48 or the resin plate on one surface side of the plate material 22 is smoothly bent along the inner surface of the concave portion 30, so that the sealing portion 58 that seals the end surface of the hollow structure 100 extends over the entire circumference. Form smoothly. The sealing portion 58 is trimmed after being taken out from the mold, or pressed between the convex portion 16 and the concave portion 30 during pressing. Thus, the cut surface 60 of the sealing portion 58 is provided so as to be formed on the other surface side of the hollow structure 100, that is, the edge of the resin sheet 48 or the resin plate on the side where the convex portion 16 is pressed.

  Therefore, according to the method for manufacturing the hollow structure 100 of the present embodiment, the end surface of the hollow structure 100 can be sealed with the smooth sealing portion 58, and the work for trimming after removal is also simple. In addition, since the cutting operation can be completed in the mold, the manufacturing process is simplified.

  Moreover, the manufacturing apparatus of the hollow structure 100 of the present embodiment has the following configuration.

  That is, the manufacturing apparatus of the hollow structure 100 of the present embodiment is formed by sticking the thermoplastic resin sheets 48 on both sides in the thickness direction of the thermoplastic resin core 46 having a hollow structure. This is an apparatus for manufacturing a predetermined hollow structure 100 using a thermoplastic plate material 22. You may use the board | plate material 22 which shape | molded the resin board integrally on the both sides of the resin core 46. FIG. The manufacturing apparatus includes a first mold 2 (upper mold 4) that can be evacuated and has a concave portion 30, and a second mold 6 (lower mold 8) that can be evacuated and has a convex portion 16. And a heater mechanism for heating the plate member 22. And the board | plate material 22 set between the 1st metal mold | die 2 and the 2nd metal mold | die 6 is heated with a heater mechanism, The heated board | plate material 22 is made into at least one of the 1st metal mold | die 2 and the 2nd metal mold | die 6. While evacuating, pressing is performed until the convex portion 16 enters the concave portion 30 by a predetermined dimension d. At this time, the upper resin sheet 48 or the resin plate, which is one surface side of the plate material 22, is bent along the inner surface of the recess 30, so that the sealing portion 58 that seals the end surface of the hollow structure 100 is formed on the entire circumference. Forms smoothly over. The sealing portion 58 is trimmed after being taken out, or pressed between the convex portion 16 and the concave portion 30 during pressing. Thus, the cut surface 60 of the sealing portion 58 is provided so as to be formed on the other surface side of the hollow structure 100, that is, the edge of the resin sheet 48 or the resin plate on the side where the convex portion 16 is pressed.

  Therefore, according to the apparatus for manufacturing the hollow structure 100 of the present embodiment, the end surface of the hollow structure 100 can be sealed with the smooth sealing portion 58, and the work for trimming after removal is also simple. In addition, since the cutting operation can be completed in the mold, the manufacturing process is simplified.

  Further, the end face sealing structure of the hollow structure 100 of the present embodiment is formed by pasting resin sheets 48 made of a thermoplastic resin on both sides in the thickness direction of a resin core 46 made of a plastic resin having a hollow structure. This is an end face sealing structure of the thermoplastic hollow structure 100. The hollow structure 100 may be formed by integrally molding resin plates on both sides of the resin core 46. In this end surface sealing structure, the sealing portion 58 that seals the end surface of the hollow structure 100 is smoothly formed by bending the end portion of the upper resin sheet 48 or resin plate that is one surface side. And the cut surface 60 of this sealing part 58 is provided so that it may be formed in the lower side which is the other surface side of the hollow structure 100. FIG.

  Therefore, according to the end surface sealing structure of the hollow structure 100 of the present embodiment, the end surface of the hollow structure 100 can be sealed with the smooth sealing portion 58. By molding the sealing portion 58, the resin core 46 is not exposed on the end surface, and the cut surface 60 of the sealing portion 58 is formed on the lower side, so that the sealing portion 58 itself is smooth. It is molded with good touch.

  As mentioned above, although this invention was demonstrated based on embodiment shown to an accompanying drawing, this invention is not limited to the said embodiment.

  For example, the hollow structure of the resin core 46 is not limited to the honeycomb structure described above, and is a hollow structure in which a large number of flat partition walls are arranged in one direction, a hollow structure in which a large number of hollow frustums are arranged in parallel, and the like. Also good. Alternatively, the resin core 46 may have a so-called harmonica structure in which a large number of vertical rib-shaped partition walls are arranged in one direction, and flat resin plates are integrally formed on both upper and lower sides of the resin core 46. The shape of the hollow structure 100 to be molded is not limited to the rectangular plate shape described above, and may be, for example, a hemispherical shape or a three-dimensional shape having a plurality of convex portions, concave portions, step portions, and the like. The molded hollow structure 100 can be used for various applications. For example, it is conceivable to employ the hollow structure 100 as a plate material for forming an assembly-type container.

  In the present embodiment, the front end surface of the convex portion 16 of the lower mold 8 is provided flat, but the front end surface of the convex portion 16 may be curved in a concave shape so that the peripheral edge is raised. In this case, the sealing portion 58 of the hollow structure 100 can have a shape having curved portions on both the upper and lower sides, and if the thin piece 56 is cut at a position close to the outer peripheral edge of the hollow structure 100, the sealing portion 58 is sealed. The part 58 is formed smoothly and with a good touch. In this embodiment, the hollow structure 100 is formed between the concave portion 30 of the upper mold 4 and the convex portion 16 of the lower mold 8, but between the concave portions provided in both the upper mold 4 and the lower mold 8. You may provide so that the hollow structure 100 may be shape | molded.

  Further, in the present embodiment, the convex portion 16 of the lower mold 8 enters the entire concave portion 30 of the upper mold 4 and is provided so as to form the sealing portion 58 on the outer periphery of the hollow structure 100. However, the present invention is not limited to this, as long as the other part enters the upper mold 4 and the lower mold 8 to form the sealing portion 58. Therefore, for example, when the hollow structure 100 has a structure having a hole, the hollow structure 100 is provided so that the other enters the upper mold 4 and the lower mold 8 only at a position where the hole is formed, and thus the hollow structure 100 is hollow. It is also possible to form the sealing portion 58 at the periphery of the hole portion of the structure body 100.

  Also in other configurations, appropriate design changes can be made within the range intended by the present invention.

2 1st metal mold 6 2nd metal mold 16 Convex part 22 Plate material 30 Concave part 46 Resin core 48 Resin sheet 58 Sealing part 60 Cut surface 100 Hollow structure

Claims (3)

A method for producing a predetermined hollow structure by using a thermoplastic resin plate having a resin sheet or resin plate on both sides of a resin core having a hollow structure, and pressing the plate with a first mold and a second mold Because
The first mold has a concave part for vacuum molding, and in this concave part, a concave curved surface that smoothly connects both sides to the boundary part between the inner bottom surface and the inner peripheral surface is formed.
The second mold has a convex part for vacuum molding that enters the concave part of the first mold,
Set the plate material between the first mold and the second mold,
Heat the set board material,
The heated plate, while vacuuming with both the first mold and the second mold, and pressed to the convex portion of the second mold enters by a predetermined distance in the recess of the first die,
The one side of the resin sheet or resin plate of the plate material, by bending along the recess of the first die, and forming a sealing portion for sealing the end face of the hollow structure,
A method for producing a hollow structure, characterized in that a cut surface of the sealing portion is provided on the other surface side of the hollow structure. An apparatus for producing a predetermined hollow structure using a plate made of a thermoplastic resin having a resin sheet or a resin plate on both sides of a resin core having a hollow structure,
A first mold having a recess for vacuum forming ;
A second mold having a convex part for vacuum molding that enters the concave part of the first mold;
A heater mechanism for heating the plate material,
In the concave portion of the first mold, a concave curved surface that smoothly connects both surfaces is formed at the boundary between the inner bottom surface and the inner peripheral surface,
The plate material set between the first mold and the second mold is heated by a heater mechanism,
The heated plate, while vacuuming with both the first mold and the second mold, and pressed to the convex portion of the second mold enters by a predetermined distance in the recess of the first die,
The one side of the resin sheet or resin plate of the plate material, by bending along the recess of the first die, and forming a sealing portion for sealing the end face of the hollow structure,
An apparatus for manufacturing a hollow structure, wherein the cut surface of the sealing portion is provided on the other surface side of the hollow structure. It is an end surface sealing structure of a hollow structure made of a thermoplastic resin having a resin sheet or a resin plate on both sides of a resin core having a hollow structure,
The end portion of the resin sheet or resin plate on the one surface side is smoothly bent, and the end portion constitutes a sealing portion that seals the end surface of the hollow structure ,
The cut surface of the sealing portion is provided on the other surface side of the hollow structure ,
The hollow structure of the resin core has a honeycomb shape and is configured to have a softening temperature lower than that of the resin sheet or resin plate,
An end face sealing structure for a hollow structure , wherein a resin reservoir is formed in the vicinity of the sealing portion of the hollow structure so as to fill the hollow of the resin core .

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