JP6449022B2 - Laminated structure and terminal processing method of laminated structure - Google Patents

Description

  The present invention relates to a laminated structure in which metal sheets are laminated on both upper and lower surfaces of a hollow plate-like resin structure formed of a synthetic resin, and a terminal processing method for the laminated structure.

  As a hollow plate-like resin structure formed of a synthetic resin, for example, one described in Patent Document 1 is known. The structure of Patent Document 1 includes a core layer having an uneven shape and sheet-like skin layers disposed on both upper and lower surfaces of the core layer. The core layer is a pair of sheets in which columnar bulges are regularly arranged, with the bulges inside, and the top of the bulges of one sheet is on the flat part of the other sheet It is formed in a concavo-convex shape by overlapping so as to abut.

  Such a laminated structure is used for various purposes after being cut into a predetermined plate shape. Here, when the cut surface of the terminal of the laminated structure is left as it is, when an article such as another member touches the terminal (cut surface) of the laminated structure, the corner of the terminal May damage the product.

  Therefore, it is preferable to perform a terminal process for eliminating the corners of the terminal on the resin structure cut into a predetermined plate shape. For example, in Patent Document 2, by pressing a jig having a concave portion having a semicircular cross section against the end of a laminated structure, the top wall portion and the bottom wall portion of the end are faced to each other. A terminal processing method is disclosed in which the terminal is bent and rounded into a semicircular cross section.

JP-A-8-127091 JP 2006-103027 A

  By the way, in order to improve the strength of the laminated structure, a metal sheet made of aluminum, iron, or the like may be used as the skin layer. Here, when the terminal treatment disclosed in Patent Document 2 is applied to the laminated structure in which the metal sheet is used, the metal sheet tries to return to the original state by the restoring force of the metal sheet, and the cross section The terminal rounded into a semicircle may be separated and the corner of the terminal may be deformed to protrude obliquely. When such deformation in the restoring direction occurs, when the article such as another member touches the terminal of the laminated structure, the effect of the terminal treatment that suppresses the article from being damaged is not sufficiently obtained.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a terminal capable of suppressing scratches caused by the terminal of a laminated structure in which metal sheets are laminated on both upper and lower surfaces of a resin structure. It is in providing the processing method and the laminated structure by which the terminal process was carried out.

A laminated structure for achieving the above object is a laminated structure in which metal sheets are laminated on the upper and lower surfaces of a hollow plate-like resin structure formed of a synthetic resin, and the terminal of the laminated structure The upper bent portion formed by bending the metal sheet located on the upper side of the resin structure toward the center in the thickness direction, and the metal sheet located on the lower side of the resin structure in the thickness direction. A lower bent portion that is bent toward the center side, and each tip portion of the upper bent portion and the lower bent portion is planar or parallel to the thickness direction of the laminated structure. Is formed in a shape bent inward, and the resin structure includes a plurality of intermediate walls erected in the thickness direction, and inside the upper bent portion and the lower bent portion, A sparse part with low density on the middle wall is provided Inside the sparse portion, characterized in that the high dense portion density of the intermediate wall is provided.

  According to the said structure, each front-end | tip part of the upper side bending part and lower side bending part in the terminal of a laminated structure is planar shape parallel to the thickness direction of a laminated structure. Since the restoring force of the metal sheet is a force for the metal sheet to return to a flat state, the restoring of the metal sheet that acts on the tip portions of the upper bent portion and the lower bent portion formed in the flat state. The power is small. Therefore, the deformation in the restoring direction is suppressed as compared with the laminated structure in which the terminal processing is performed by rounding the entire terminal into a semicircular cross section. Thereby, it is suppressed that the corner | angular of the terminal of a laminated structure will protrude, and as a result, it is suppressed that articles | goods, such as another member which touched the terminal of the laminated structure, are damaged.

  Further, even if the terminal of the laminated structure is deformed in the restoring direction based on the restoring force of the metal sheet, the deformation is caused by moving the tip part (planar part) of the upper bent part to the upper side and the lower side. This is a deformation in the direction of moving the tip portion (planar portion) of the bent portion downward. For this reason, even after the deformation, the tip portions of the upper bent portion and the lower bent portion are maintained in a planar state parallel to the thickness direction of the laminated structure. It is suppressed that it will be in a state.

  Moreover, according to the said structure, each front-end | tip part of the upper side bending part and lower side bending part in the terminal of a laminated structure becomes the shape bent inside rather than the plane parallel to the thickness direction of a laminated structure. . Therefore, even if the deformation of the end of the laminated structure occurs in the restoring direction, the tip portions of the upper bent portion and the lower bent portion are deformed in a direction approaching a plane parallel to the thickness direction of the laminated structure, Immediately the corner of the terminal does not protrude diagonally. Thereby, it is suppressed that the corner | angular of the terminal of a laminated structure will protrude, and as a result, it can suppress that articles | goods, such as another member which touched the terminal of the laminated structure, are damaged.

  When the upper bent portion and the lower bent portion are formed, the intermediate wall located inside thereof is compressed. Therefore, in addition to the restoring force of the metal sheet, the pressure from the intermediate wall acts as a force to return the upper bent portion and the lower bent portion to the original state on the upper bent portion and the lower bent portion. . Therefore, by making the inside of the upper bent portion and the lower bent portion a sparse portion with a low density of the intermediate wall, the force for returning the upper bent portion and the lower bent portion to the original state can be weakened. it can. Moreover, the intensity | strength of the terminal of a laminated structure is securable by making the inner side of the sparse part with a low density of an intermediate wall into a dense part with a high density of an intermediate wall.

  Moreover, the terminal processing method of the laminated structure for achieving said objective is the terminal processing method of the laminated structure by which a metal sheet is laminated | stacked on both upper and lower surfaces of the hollow plate-shaped resin structure formed with a synthetic resin. A flat plate portion forming step of forming an upper flat plate portion and a lower flat plate portion above and below the same end portion by recessing at least a central portion in the thickness direction of the resin structure portion at the end of the laminated structure. And pressing the jig against the end of the laminated structure, or pressing the jig against the end of the laminated structure, the tips of the upper flat plate portion and the lower flat plate portion at the end are A bending process for bending the facings, and the jig includes a U-shaped terminal forming surface, and the terminal forming surface is formed in a shape along the upper surface and the lower surface of the laminated structure. Upper inner surface It is formed continuously from the lower inner surface, the upper inner surface and the lower inner surface, and at the central portion thereof from a plane portion parallel to the thickness direction of the laminated structure or a plane parallel to the thickness direction Also, a jig comprising a protruding bottom surface projecting is used, and in the bending step, the jig is brought into contact with the end of the laminated structure without heating.

  In the above configuration, a jig having a flat surface portion parallel to the thickness direction of the laminated structure or a projecting surface portion protruding from the flat surface parallel to the thickness direction is used on the bottom surface of the terminal forming surface. Therefore, in the bending step, when the end of the laminated structure is bent so that the tips of the upper flat plate portion and the lower flat plate portion face each other, the tip portion is a plane parallel to the thickness direction of the laminated structure. Or a shape bent inward from a plane parallel to the same thickness direction.

  Further, in the flat plate portion forming step, at least the central portion in the thickness direction of the resin structure portion is recessed. Therefore, when the end of the laminated structure is bent so that the tips of the upper flat plate portion and the lower flat plate portion face each other, the resin density of the resin structure is placed on the inner portions of the upper flat plate portion and the lower flat plate portion. Low sparse part can be formed.

In the bending process, the jig is brought into contact with the end of the laminated structure without heating.
When the restoring force of the metal sheet acts on the terminal of the laminated structure, if the resin structure part of the terminal is in a softened state, the resin is deformed in the restoring direction of the terminal based on the restoring force of the metal sheet. The structure easily follows and the amount of deformation in the restoring direction tends to increase.

  According to the said structure, the bending process is made into the environment where the resin structure part of a terminal is hard to soften by not heating a jig | tool. Thereby, when the restoring force of the metal sheet is applied, the resin structure becomes difficult to follow, and deformation of the terminal in the restoring direction based on the restoring force of the metal sheet is suppressed.

Further, in the flat plate portion forming step, it is preferable that at least a central portion in the thickness direction of the resin structure portion is pushed and depressed.
According to the said structure, the dense part produced by the resin structure being brought near inside the hollow part after a flat plate part formation process is formed. Therefore, when the terminal of the laminated structure is bent, a dense portion with a high resin density of the resin structure can be easily formed.

  ADVANTAGE OF THE INVENTION According to this invention, the damage by the terminal can be suppressed about the laminated structure by which a metal sheet is laminated | stacked on the upper and lower surfaces of a resin structure.

(A) is a perspective view which shows the laminated structure before a terminal process, (b) is an AA sectional view. (A)-(c) is explanatory drawing which shows the manufacturing method of a resin structure. (A), (b) is explanatory drawing of a flat plate part formation process. Sectional drawing which shows the state which pressed the 1st jig | tool in the flat plate part formation process. Sectional drawing of the laminated structure after a flat plate part formation process. (A), (b) is explanatory drawing of a bending process. Sectional drawing which shows the state which pressed the 2nd jig | tool in the bending process. Sectional drawing which shows the laminated structure after a terminal process. Explanatory drawing in the case of terminal-processing a corner part.

Hereinafter, an embodiment of a terminal processing method of a laminated structure and a laminated structure subjected to terminal processing will be described.
First, a laminated structure that is a processing target of the terminal processing method will be described.

  As shown in FIGS. 1A and 1B, a laminated structure 10 includes a hollow plate-like resin structure 20 formed of a synthetic resin and a metal that is integrally laminated on both upper and lower surfaces of the resin structure 20. And a sheet 30.

  As shown in FIG. 1B, the resin structure 20 includes an upper wall 21, a lower wall 22, and an intermediate wall 23 that connects the upper wall 21 and the lower wall 22. While constituting the hexagonal column-shaped cylinder part standingly arranged between the upper wall 21 and the lower wall 22, the hollow cell is divided and formed in the inside of a cylinder part.

  As shown in FIGS. 2A to 2C, the resin structure 20 includes a single sheet material 20A formed in a predetermined shape, which is folded at a line P and at a line Q, and is folded at a line Q. It is formed by folding and bonding. Therefore, the upper wall 21 and the lower wall 22 of the resin structure 20 are formed in a double structure in which one of the upper wall 21 and the lower wall 22 is overlapped with each other for each cell. FIG. 1B shows a portion where the upper wall 21 has a double structure. Moreover, as shown in FIG.1 (b), about the intermediate wall 23 of the resin structure 20, the part (intermediate wall 23 extended in a Y direction) has comprised the double structure on which the sheet material of 2 sheets was piled up. Yes. In addition, such a resin structure is well-known (for example, refer Unexamined-Japanese-Patent No. 2013-35154).

  The synthetic resin material constituting the resin structure 20 is not particularly limited, and a known synthetic resin material used for the hollow plate-like resin structure, for example, heat of polypropylene, polyethylene, polycarbonate, vinyl chloride or the like. A plastic resin can be used.

  The metal sheet 30 is laminated on the surfaces of the upper wall 21 and the lower wall 22 in the resin structure 20, and is integrally fixed by adhesion by thermal welding, adhesion using an adhesive, or the like. Examples of the metal constituting the metal sheet 30 include aluminum and iron. Moreover, the thickness of the metal sheet 30 is, for example, in the range of 300 to 30 μm.

Next, the terminal processing method of the laminated structure according to the present embodiment will be described with reference to FIGS.
Here, as the laminated structure 10 for performing the terminal treatment, a laminated structure cut into a long square shape along the X direction and the Y direction shown in FIG. 1 is used. And the terminal process is performed with respect to the cut surface which follows the Y direction of the laminated structure 10, and becomes the same structure as the cross-sectional structure shown in FIG.1 (b). 3 to 6, the double structure portion of each wall of the laminated structure 10 is also simplified to be a single structure.

The terminal processing method of a laminated structure has a flat plate portion forming step for forming flat plate portions above and below the terminal of the laminated structure, and a bending step for bending the terminal of the laminated structure.
In the flat plate portion forming step, the first jig 40 is used to form the protrusions at the top and bottom of the terminal by denting the central portion in the thickness direction of the resin structure 20 at the terminal of the laminated structure 10. It is a process.

  As shown in FIGS. 3A and 3B, the first jig 40 includes a first processed surface 41 formed in a shape along a terminal on which a terminal process is performed in the laminated structure 10. . A protrusion 42 having a trapezoidal cross section that protrudes from the first processed surface 41 is provided at the center of the first processed surface 41 in the width direction (vertical direction in the drawing). A heater 43 that heats the first jig 40 is connected to the first jig 40.

  As shown in FIG. 4, in the flat plate portion forming step, the first processed surface 41 of the first jig 40 heated by the heater 43 is pressed against the end of the laminated structure 10. At this time, the intermediate wall 23 of the resin structure 20 portion in the laminated structure 10 is heated and softened by coming into contact with the protrusion 42 of the first jig 40 and is pushed inward by the protrusion 42. Thereafter, the first jig 40 is retracted from the laminated structure 10.

  As a result, as shown in FIG. 5, a recess 24 is formed in which the intermediate wall 23 is pushed into the central portion in the thickness direction of the resin structure 20 portion at the end of the laminated structure 10. Specifically, the intermediate wall 23 in a softened state in contact with the ridge 42 of the first jig 40 is pushed by the ridge 42, and the inside (back side), the upper wall 21, and the lower wall 22. It is brought to the side. As a result, a concave portion 24 formed by the intermediate wall 23 being pushed in is formed at the end of the laminated structure 10, and a dense portion (resin reservoir) generated by the intermediate wall 23 being brought closer to the inner side of the concave portion 24. ) Is formed.

  And by forming the recess 24, an upper flat plate portion 25 made of a metal sheet 30 laminated on the upper wall 21 and the upper wall 21 and protruding relatively to the recess 24 is formed on the upper portion of the terminal. It is formed. Similarly, a lower flat plate portion 26 made of a lower wall 22 and a metal sheet 30 laminated on the lower wall 22 and projecting relative to the concave portion 24 is formed at the lower portion of the terminal.

The bending step is a step of bending the upper flat plate portion 25 and the lower flat plate portion 26 of the terminal of the laminated structure 10 using the second jig 50 so that the tips thereof face each other.
As shown in FIGS. 6A and 6B, the second jig 50 includes a second processed surface 51 formed in a shape along a terminal on which a terminal process is performed in the laminated structure 10. . A groove 52 having a U-shaped cross section is provided at the center of the second processed surface in the width direction (vertical direction in the drawing).

  The groove 52 includes a bottom surface 53, and an upper inner surface 54 and a lower inner surface 55 formed continuously from the bottom surface 53. A flat portion 53a parallel to the vertical direction (thickness direction of the laminated structure 10) is formed in the central portion of the bottom surface 53, and the upper and lower portions of the bottom surface 53, that is, the corner portion and the lower side with the upper inner surface 54 are formed. Both corner portions with the inner surface 55 are formed in a gentle curved surface.

  The upper inner surface 54 is formed in a planar shape along the upper surface of the laminated structure 10, and the lower inner surface 55 is formed in a planar shape along the upper surface of the laminated structure 10. The distance between the upper inner surface 54 and the lower inner surface 55 is set to be the same as or slightly longer than the length of the laminated structure 10 in the thickness direction. Further, on the opening side of the upper inner surface 54 and the lower inner surface 55 on the inner surface of the groove 52, tapered guide surfaces 56 that are widened toward the opening side are formed. The bottom surface 53, the upper inner surface 54, and the lower inner surface 55 on the inner surface of the groove 52 constitute a terminal forming surface having a U-shaped cross section.

  As shown in FIG. 7, in the bending process, the second processed surface 51 of the second jig 50 is pushed against the end of the laminated structure 10 in a state where the second jig 50 is not heated (temperature below room temperature). Hit it. At this time, the terminal of the laminated structure 10 is inserted into the groove 52 along the guide surface 56. When the tips of the upper flat plate portion 25 and the lower flat plate portion 26 of the terminal of the laminated structure 10 reach the bottom surface 53 of the groove 52, the upper flat plate portion 25 and the lower flat plate portion 26 are aligned with each other along the bottom surface 53. Gradually bend toward the center in the thickness direction so as to face each other, and bend into a shape following the bottom surface 53. Then, after maintaining the state where the second jig 50 is pressed against the end of the laminated structure 10 for a predetermined time, the second jig 50 is retracted from the laminated structure 10. Through this bending process, the terminal treatment of the laminated structure is completed, and a laminated structure subjected to the terminal treatment is obtained.

Next, a laminated structure 10A that has been subjected to terminal processing by the terminal processing method of the present embodiment will be described.
As shown in FIG. 8, at the end of the laminated structure 10A, the upper flat plate portion 25 and the lower flat plate portion 26 formed in the flat plate portion forming step are centered in the thickness direction so that the tips face each other. An upper bent portion 25a and a lower bent portion 26a are formed. The tip portions of the upper bent portion 25a and the lower bent portion 26a face each other with a slight gap and are formed in a planar shape parallel to the thickness direction of the laminated structure 10A. That is, the outer surfaces of the tip portions of the upper bent portion 25 a and the lower bent portion 26 a are located on the same plane parallel to the thickness direction of the laminated structure 10. And the cut surface of the terminal of a laminated structure is made into the closed state by the upper side bending part 25a and the lower side bending part 26a.

  In addition, a sparse part 27 having a low density of the intermediate wall 23 in the resin structure 20 is provided inside the upper bent part 25a and the lower bent part 26a, and the intermediate wall 23 is further inside the sparse part 27. A dense portion 28 having a high density is provided. The sparse part 27 is a part formed based on the space (concave part 24) generated by the inner wall 23 on the terminal side being pushed inward in the flat plate part forming step. In addition, the dense portion 28 is a portion formed based on a dense portion generated by the intermediate wall 23 being pushed by the inner wall 23 on the terminal side being pushed inward in the flat plate portion forming step. In addition, the level of density said here is based on the density of the intermediate wall 23 in the site | part in which the terminal process in the resin structure 20 is not made.

  The laminated structure 10A subjected to the terminal treatment can be applied as, for example, a transport container, a housing building material, an automobile interior material, a civil engineering material, or a packaging material. Examples of residential building materials include flooring materials, flooring materials, underfloor materials, tatami core materials, housing ventilation materials, and fireproof materials. Examples of automobile interior materials include trunk room covers and roof linings. Further, when the laminated structure 10A is applied to a specific product, the surface of the laminated structure 10A may be covered with a sheet material such as a woven fabric or a nonwoven fabric.

Next, the operation of this embodiment will be described.
As described above, in the laminated structure 10A to which the terminal processing method of the present embodiment is applied, the tip portions of the upper bent portion 25a and the lower bent portion 26a at the terminal are parallel to the thickness direction of the laminated structure 10A. It has a flat shape.

  Since the restoring force of the metal sheet 30 is a force for the metal sheet 30 to return to a flat state, it acts on the respective tip portions of the upper bent portion 25a and the lower bent portion 26a formed in a flat state. The restoring force of the metal sheet 30 is small. Therefore, the deformation | transformation to the restoring direction in a terminal is suppressed compared with the laminated structure by which the conventional terminal process which rounded the whole terminal in the semicircle shape was made | formed.

  Further, even if the terminal of the laminated structure 10 </ b> A is deformed in the restoring direction based on the restoring force of the metal sheet 30, the deformation is caused by moving the tip portion (planar portion) of the upper bent portion 25 a upward. The tip portion (planar portion) of the lower bent portion 26a is deformed in the direction of moving downward. Therefore, even after the deformation, the tip portions of the upper bent portion 25a and the lower bent portion 26a are maintained in a planar shape parallel to the thickness direction of the laminated structure 10A, and the terminal corners 29 are It is suppressed that it will be in the state where it protruded diagonally.

  Thus, according to this embodiment, it is suppressed that the corner | angular 29 of the terminal of 10 A of laminated structures protrudes. As a result, it is possible to prevent the article such as another member touching the terminal of the laminated structure 10A from being damaged.

Next, the effect of this embodiment will be described.
(1) The laminated structure 10A is formed by laminating metal sheets 30 on both upper and lower surfaces of a hollow plate-like resin structure 20 formed of a synthetic resin. At the end of the laminated structure 10, an upper bent portion 25 a formed by bending the metal sheet 30 located above the resin structure 20 toward the center in the thickness direction, and a metal located below the resin structure 20. A lower bent portion 26a formed by bending the sheet 30 toward the center side in the thickness direction is provided. The tip portions of the upper bent portion 25a and the lower bent portion 26a are formed in a planar shape parallel to the thickness direction of the laminated structure 10.

  According to the said structure, it can suppress that articles | goods, such as another member touched the terminal of laminated structure 10A, are damaged. Moreover, when using 10 A of laminated structures in the aspect which coat | covers the surface with sheet materials, such as a woven fabric and a nonwoven fabric, it can suppress that a sheet material is torn by the terminal of laminated structure 10A.

  (2) In the laminated structure 10A, the resin structure 20 includes a plurality of intermediate walls 23 erected in the thickness direction. A sparse portion 27 having a low density of the intermediate wall 23 is provided inside the upper bent portion 25a and the lower bent portion 26a. A dense portion 28 having a high density of the intermediate wall 23 is provided inside the sparse portion 27.

  When the upper bent portion 25a and the lower bent portion 26a are formed, the intermediate wall 23 positioned on the inner side is compressed not a little. Therefore, in addition to the restoring force of the metal sheet 30, the pressure from the intermediate wall 23 returns the upper bent portion 25 a and the lower bent portion 26 a to the original state at the upper bent portion 25 a and the lower bent portion 26 a. Acts as a force. In particular, when a resin structure having a multi-layered intermediate wall 23 is used as the resin structure 20 as in this embodiment, the pressure from the intermediate wall 23 is greater. Therefore, by setting the inner side of the upper bent portion 25a and the lower bent portion 26a as the sparse portion 27 having a low density of the intermediate wall 23, the upper bent portion 25a and the lower bent portion 26a are returned to the original state. You can weaken the power to do. Moreover, the strength of the terminal of the laminated structure 10 </ b> A can be ensured by making the inner side of the sparse part 27 with a low density of the intermediate wall 23 a dense part 28 with a high density of the intermediate wall 23.

  (3) The terminal processing method of the laminated structure 10 in which the metal sheets 30 are laminated on the upper and lower surfaces of the hollow plate-like resin structure 20 formed of synthetic resin is the resin structure 20 at the terminal of the laminated structure 10. A flat plate portion forming step of forming the upper flat plate portion 25 and the lower flat plate portion 26 on the upper and lower sides of the terminal by recessing the central portion in the thickness direction of the portion, and the second jig 50 at the end of the laminated structure 10 By bending the upper flat plate portion 25 and the lower flat plate portion 26 of the terminal so that their tips face each other. As the second jig 50, a terminal forming surface having a U-shaped cross section is provided, and the terminal forming surface is formed in a shape along the upper surface and the lower surface of the laminated structure 10, and the upper inner surface 54 and the lower inner surface 55. A jig is used which is formed continuously from the inner surface 54 and the lower inner surface 55 and has a bottom surface 53 having a flat portion 53a parallel to the thickness direction of the laminated structure 10 at the center thereof.

  Since the flat surface portion 53a parallel to the thickness direction of the laminated structure 10 is formed on the bottom surface 53 of the terminal forming surface of the second jig 50, the upper flat plate portion of the end of the laminated structure 10 is formed in the bending process. When the 25 and the lower flat plate portion 26 are bent so that the tips thereof face each other, the tip portions can be formed in a planar shape parallel to the thickness direction of the laminated structure 10.

  Further, since the bending step is performed with the central portion in the thickness direction of the resin structure 20 being depressed, the resin density (intermediate of the resin structure 20 is placed inside the upper bent portion 25a and the lower bent portion 26a. The sparse part 27 having a low density of the wall 23 can be easily formed.

(4) In the flat plate portion forming step, the recess 24 is formed by pushing the intermediate wall 23 of the end of the resin structure 20 inward.
According to the above configuration, a dense portion generated by the intermediate wall 23 being brought close to the inside of the recess 24 is formed. Therefore, when the terminal of the laminated structure 10 is bent, the dense portion 28 having a high resin density of the resin structure 20 (density of the intermediate wall 23) can be easily formed inside the sparse portion 27.

(5) In the bending step, the second jig 50 is brought into contact with the end of the laminated structure 10 without heating.
When the restoring force of the metal sheet 30 is applied to the terminal of the laminated structure 10A, if the resin structure 20 portion of the terminal is in a softened state, the terminal is restored in the restoring direction based on the restoring force of the metal sheet 30. The resin structure 20 easily follows this deformation, and the amount of deformation in the restoring direction tends to increase.

  According to the said structure, the 2nd jig | tool 50 is not heated, The bending process is made into the environment where the resin structure 20 part of a terminal is hard to soften. Thereby, when the restoring force of the metal sheet 30 acts, the resin structure 20 becomes difficult to follow, and the deformation of the terminal in the restoring direction based on the restoring force of the metal sheet 30 is suppressed.

(6) The distance between the upper inner surface 54 and the lower inner surface 55 in the second jig 50 is set to be the same as or slightly longer than the length in the thickness direction of the laminated structure 10. .
According to the above configuration, when the upper flat plate portion 25 and the lower flat plate portion 26 are bent along the bottom surface 53 of the second jig 50, swelling in the thickness direction of the laminated structure 10 is suppressed. As a result, the upper flat plate portion 25 and the lower flat plate portion 26 can be beautifully bent into a shape following the bottom surface 53.

In addition, this embodiment can also be changed and embodied as follows.
-Regarding the laminated structure 10A, in the above embodiment, the upper bent portion 25a and the lower bent portion 26a are in a state where the tips are separated from each other, but the tips may be in contact with each other.

  The tip portions of the upper bent portion 25a and the lower bent portion 26a may have a shape bent inward from a plane parallel to the thickness direction of the laminated structure 10A. For example, the entire tip portions of the upper bent portion 25a and the lower bent portion 26a are formed in a sloped shape toward the inside from the plane parallel to the thickness direction of the laminated structure 10A. Further, with respect to the distal end portions of the upper bent portion 25a and the lower bent portion 26a, the base end side is a plane parallel to the thickness direction of the laminated structure 10A, and only the distal end side is a plane parallel to the thickness direction. It forms in the shape of the slope which goes inside. Further, the entire upper bent portion 25a and lower bent portion 26a are formed in an arc shape, and the tip thereof is formed so as to face the inner side of the plane parallel to the thickness direction of the laminated structure 10A. Note that, from the viewpoint of suppressing the pressure required for forming the upper bent portion 25a and the lower bent portion 26a to be small, the tip portions of the upper bent portion 25a and the lower bent portion 26a are laminated structures as in the above embodiment. It is preferable to form in a planar shape parallel to the thickness direction of 10A.

  In this case, even if the terminal of the laminated structure 10A is deformed in the restoring direction, the tip portions of the upper bent portion 25a and the lower bent portion 26a are planes parallel to the thickness direction of the laminated structure 10A. The terminal 29 is not deformed in a direction approaching the terminal and the terminal corner 29 does not immediately protrude obliquely. Thereby, it is suppressed that the corner | angular 29 of the terminal of laminated structure 10A protrudes, As a result, it suppresses that articles | goods, such as another member which touched the terminal of laminated structure 10A, are damaged. it can.

  In addition, when forming the front-end | tip part of the upper side bending part 25a and the lower side bending part 26a as mentioned above, it replaces with the plane part 53a with respect to the bottom face 53 of the terminal formation surface as the 2nd jig | tool 50, for example. Thus, a jig provided with a projecting surface portion protruding from a plane parallel to the thickness direction of the laminated structure 10A may be used.

  In the stacked structure 10A, the sparse part 27 and the dense part 28 may be formed on the entire terminal-treated part or may be formed only on a part of the terminal-treated part. Further, a configuration in which one or both of the sparse portion 27 and the dense portion 28 are omitted may be employed.

  -Regarding the laminated structure 10 (10A), the structure of the resin structure 20 is not particularly limited, and other known resin structures can be used. Other resin structures include, for example, a resin structure having a core layer having an up-and-down concavo-convex shape as disclosed in Patent Document 1 and Patent Document 2, a resin structure having a ladder-like cross section, and a cardboard A resin structure having a corrugated intermediate wall cross-section, a resin structure having a triangular prism-shaped or triangular pyramid-shaped intermediate wall 23, and a resin sheet having a triangular prism-shaped protrusion are stacked so that the tips of the protrusions are aligned with each other. The resin structure which becomes is mentioned.

  The resin structure 20 may have a configuration in which one or both of the upper wall 21 and the lower wall 22 are omitted. That is, the laminated structure 10 (10A) having a configuration in which the metal sheet 30 is fixed directly to the intermediate wall 23 may be used.

  -About laminated structure 10 (10A), the sheet | seat of other raw materials, such as a nonwoven fabric, may be provided between the resin structure 20 and the metal sheet 30. FIG. Further, a sheet of another material such as a nonwoven fabric may be laminated on the surface of the metal sheet 30. Further, an adhesive layer may be provided between the respective layers.

  In the flat plate portion forming step in the terminal processing method, in the above embodiment, the intermediate wall 23 of the resin structure 20 is softened by heat, but the method of softening the intermediate wall 23 is not limited to this method. . For example, the intermediate wall 23 of the resin structure 20 may be softened using ultrasonic waves.

  The shape of the protrusion 42 provided on the first processed surface 41 of the first jig 40 is a shape that can form the recess 24 formed by the intermediate wall 23 being pushed into the end of the laminated structure 10 in the flat plate portion forming step. If it is, it will not specifically limit. For example, it may be a ridge having a triangular cross section or a ridge having a circular arc cross section.

  In the flat plate portion forming step, in the above embodiment, the concave portion 24 is formed by pushing the intermediate wall 23 of the end of the resin structure 20, but the method of forming the concave portion 24 is not limited to this method. . For example, the recess 24 may be formed by removing a part of the intermediate wall 23 of the terminal with a cutter or the like. In this case, the laminated structure 10A from which the dense portion 28 is omitted is obtained.

  In the flat plate portion forming step, in the above embodiment, the concave portion 24 is formed by recessing the central portion of the intermediate wall 23 of the terminal of the resin structure 20, but the concave portion 24 is formed by recessing the entire intermediate wall 23. May be formed.

  -The shape of the upper side flat plate part 25 and the lower side flat plate part 26 formed in a flat plate part formation process is not specifically limited. For example, a flat plate portion having a constant width from the proximal end side toward the distal end side, a flat plate portion gradually widening from the proximal end side toward the distal end side, or a proximal end from the distal end side may be used. It may be a flat plate portion that gradually widens toward the side.

  The specific shape of the second jig 50 used in the bending step is not particularly limited as long as the second jig 50 has a terminal-forming surface having a U-shaped cross section including a bottom surface 53, an upper inner surface 54, and a lower inner surface 55. It is not something. For example, the guide surface 56 may be omitted.

  The length of the upper inner surface 54 and the lower inner surface 55 (the length in the depth direction of the groove 52) on the terminal forming surface of the second jig 50 is not particularly limited. For example, the first jig It is preferable that the length of the protrusion 42 provided on the protrusion 40 is set longer than the protrusion length. In this case, the effect (6) is enhanced.

  In the flat plate portion forming step, in the above embodiment, the first jig 40 is pressed against the end of the laminated structure 10, but the laminated structure 10 may be pressed against the first jig 40. Similarly, the laminated structure 10 may be pressed against the second jig 50 in the bending step.

  In the above embodiment, the case where the terminal treatment is performed on one side of the laminated structure 10 that is cut into a long rectangular shape has been described, but the same applies to all the sides of the laminated structure 10 or any plurality of sides. The terminal processing may be performed.

  As shown in FIG. 9, in the terminal process for the corner portion of the laminated structure 10, the terminal process for one side forming the corner part is overlapped with the terminal process for the other side forming the corner part. It is preferable to carry out. Thereby, also about the corner part of the laminated structure 10, the terminal can be bent beautifully.

Next, the technical idea that can be grasped from the embodiment and the modified examples will be described.
(B) The resin structure includes the intermediate wall having a multilayer structure, and the laminated structure in which a sparse portion having a low density of the intermediate wall is provided inside the upper bent portion and the lower bent portion. .

  DESCRIPTION OF SYMBOLS 10, 10A ... Laminated structure, 20 ... Resin structure, 21 ... Upper wall, 22 ... Lower wall, 23 ... Intermediate wall, 24 ... Recessed part, 25 ... Upper flat plate part, 25a ... Upper bending part, 26 ... Lower flat plate Part, 26a ... lower bent part, 27 ... sparse part, 28 ... dense part, 30 ... metal sheet, 40 ... first jig, 50 ... second jig, 53 ... bottom face, 53a ... flat part, 54 ... upper part Inner surface, 55 ... lower inner surface.

Claims (3)

A laminated structure in which metal sheets are laminated on both upper and lower surfaces of a hollow plate-like resin structure formed of a synthetic resin,
At the end of the laminated structure, an upper bent portion formed by bending the metal sheet positioned on the upper side of the resin structure toward the center in the thickness direction, and the metal positioned on the lower side of the resin structure A lower bent portion formed by bending the sheet toward the center in the thickness direction, and
Each tip portion of the upper bent portion and the lower bent portion is formed in a planar shape parallel to the thickness direction of the laminated structure, or a shape bent inward from the same plane ,
The resin structure includes a plurality of intermediate walls standing in the thickness direction,
A sparse part having a low density of the intermediate wall is provided inside the upper bent part and the lower bent part, and a dense part having a high density of the intermediate wall is provided inside the sparse part. layered structure, characterized in that there. A terminal treatment method for a laminated structure in which metal sheets are laminated on both upper and lower surfaces of a hollow plate-like resin structure formed of a synthetic resin,
A flat plate portion forming step for forming an upper flat plate portion and a lower flat plate portion on the upper and lower sides of the terminal by recessing at least a central portion in the thickness direction of the resin structure portion in the terminal of the laminated structure;
By pressing a jig against the end of the laminated structure, or pressing the jig against the end of the laminated structure, the upper flat plate portion and the lower flat plate portion of the end face each other. And a bending process for bending
The jig includes a terminal forming surface having a U-shaped cross section, and the terminal forming surface is formed in a shape along the upper surface and the lower surface of the laminated structure, the upper inner surface, A bottom surface formed continuously from the lower inner surface and having a flat surface portion parallel to the thickness direction of the laminated structure or a projecting surface portion projecting from a plane parallel to the thickness direction at the center portion thereof; Using a jig consisting of
In the bending step, the terminal processing method for a laminated structure, wherein the jig is brought into contact with the terminal of the laminated structure without heating. The terminal processing method for a laminated structure according to claim 2 , wherein, in the flat plate portion forming step, at least a central portion in the thickness direction of the resin structure portion is pressed and depressed.