JP2016060171A - Core material for sandwich panel, core for sandwich panel, and sandwich panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide core materials for a sandwich panel having high flexural rigidity, strong adhesion to a skin material and capable of obtaining a sufficient die-cutting gradient.SOLUTION: Core materials 1, 100 for a sandwich panel have: a first flat surface 5 formed at the side of a first face 3; plural protrusions which have second flat surfaces 41 parallel to the first flat surface 5 at the top faces, have the prescribed intervals around the first flat surface 5 and protrude from the second surfaces 41 toward the first surface 5; and the recesses 7 being spaces formed by the first flat surface 5 and plural sidewall faces 42, 43 of plural protrusions 4 disposed around the first surface 5. The protrusion 4 and the recess 7 of the core materials 1, 100 are formed into the shapes of the recess 7 and the protrusion 4 in which the split parts obtained by splitting the polyhedron having a space packing shape at an equatorial part are mutually fitted in. The protrusion 4 has the plural first sidewall faces 42 having a first polygonal flat surface, and the plural second sidewall faces 43 having a second polygonal flat surface.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a technique of a core material used for a sandwich panel used in a structural member such as an automobile, an aircraft, and a building, or furniture such as a desk.

  As a core material used for a sandwich panel, a honeycomb core is typically used. A sandwich panel is formed by bonding a skin material to both end faces of the honeycomb core with an adhesive. The honeycomb core has a small adhesion area with the skin material and is line-bonded, and therefore tends to be peeled off. Therefore, if the skin material peels during bending deformation, the bending strength may be reduced. In general, the bending rigidity of the honeycomb core is small.

  Therefore, a core having a configuration in which a core material in which a plurality of protruding portions are formed to protrude on one surface of a plate material is bonded to each other as a core replacing the honeycomb core has been proposed. The core is configured such that the protruding portions of the core material face each other, and the protruding portion of one core material is fitted into a recess formed between the protruding portions of the other core material (Patent Literature). 1, Patent Document 2).

  The core material described in Patent Document 1 has a cube-shaped projecting protruding portion in which the top surface is a flat surface, the four side wall surfaces are raised at a right angle from the surface of the plate material, and the adjacent side wall surfaces are joined at a right angle; It has a concave space filling part formed between the side wall surfaces of the protrusions. The core material described in Patent Document 1 has a cubic shape of the protruding portion, so that in a state where the pair of core materials are fitted to each other's protruding portion and the space filling portion, the side wall surfaces, the top surface of the protruding portion, and The bottom surfaces of the space filling portion are in contact with each other. For this reason, the core described in the cited document 1 has a large bending rigidity. However, when the core material is formed by press molding, the side wall surface does not have a gradient for die cutting, and thus it is considered that the moldability in press molding or the like is poor.

  The core material described in Patent Document 2 forms the protrusions in a triangular pyramid shape. A plurality of triangular pyramidal protrusions are formed with their bases aligned, and three protrusions are arranged at equal intervals along the circumferential direction around an arbitrary point. In these three protrusions, a space surrounded by a ridge line toward the center point is defined as a space filling part. Then, the core is obtained by fitting the protruding portion of one core material into the space filling portion of the other core material. In this case, each ridge line of the triangular pyramid-shaped protrusion formed on one core material is joined to the ridge line of each protrusion constituting the space filling portion formed on the other core material.

  The core described in Patent Document 2 is provided in a state in which the protruding portion of one core material and the space filling portion of the other core material are in a fitted state, and the side wall surface of the protruding portion formed on one core material and the other core material. The side walls of the formed protrusions do not face each other. For this reason, when bending deformation is applied to the core, resistance to bending due to the contact of the side wall surfaces of the protruding portion of one core material and the protruding portion of the other core material cannot be expected.

JP 2007-055143 A JP 2007-023661 A

  An object of the present invention is to provide a technique related to a core material that has a high bending rigidity, a strong adhesive force with a skin material, and a sufficient die-cutting gradient.

  A sandwich panel core material that realizes the object of the present invention has a flat first flat surface formed on the first surface side and a second flat surface parallel to the first flat surface and flat on the top surface. A plurality of protrusions projecting from the second surface side toward the first surface side with a predetermined interval around the first flat surface, and the first flat surface and the first flat surface 1 A core material for a sandwich panel having a space formed by the side wall surfaces of a plurality of convex portions arranged around a flat surface as a concave portion, wherein the convex portion and the concave portion are a polyhedron having a space filling shape. The divided part divided into two at the equator part is formed in the shape of a concave part and a convex part that fit each other, and the side wall surface of the convex part includes a plurality of first side wall surfaces of a first polygonal plane, And a plurality of second side wall surfaces having a polygonal plane.

  In the core material configured as described above, one side of the plurality of first side wall surfaces is bonded to each side of the top surface, and a bottom side of the second side wall surface is bonded to the first flat surface.

  In any configuration of the core material described above, the plurality of convex portions are arranged on the same line in accordance with a first ridge line where adjacent first side wall surfaces are joined to each other.

  In any configuration of the core material described above, the plurality of convex portions are arranged such that adjacent convex portions have a gap.

  In any configuration of the core material described above, the polyhedron forming the space filling shape is a truncated octahedron.

  In the configuration of the core material, the second side wall surface is a triangular plane and faces the second side wall surface of the adjacent convex portion.

  The structure of the sandwich panel core that realizes the object of the present invention has a pair of sandwich panel core materials having any one of the structures described above, and the first surface of the first core material and the other core material of the first surface of each other. The concavo-convex parts were fitted with facing each other, and adhered with an adhesive.

  In another configuration of the core for a sandwich panel that realizes the object of the present invention, a plurality of cores having the above-described configuration are stacked, and each stack is bonded with an adhesive.

  The structure of the sandwich panel that realizes the object of the present invention was formed by adhering a skin material to both surfaces of any one of the above-described constituent cores with an adhesive.

  According to the present invention, the core material for sandwich panels is formed by the concave and convex portions of the space-filled polyhedron (excluding the hexahedron), so that the punching property at the time of press molding is improved. In addition, the rigidity increased.

  Furthermore, since the sandwich core is bonded to the skin material in a polyhedral shape, the bonding area with the skin material is wide and bonding is easy.

The partial perspective view which shows 1st Embodiment of the core material for sandwich panels by this invention. The disassembled perspective view explaining the state which overlaps and fits the core material for sandwich panels of FIG. FIG. 2 is a partial perspective view of a sandwich panel core formed by stacking two sandwich panel core materials of FIG. 1. Sectional drawing of the sandwich panel which laminated | stacked three layers of the sandwich panel core shown in FIG. The figure which shows the size of the protrusion part 4 used for the intensity | strength test of the core of the 3 layer structure shown in FIG. The figure which shows the size of the honeycomb used for the strength test of the honeycomb core. The figure which shows the strength test result of the core shown in FIG. 5, and the honeycomb core shown in FIG. The figure which shows a rhombus dodecahedron. The front view which shows the upper half which divided | segmented the rhombus dodecahedron shown in FIG. 8 by the equator line. The fragmentary top view which shows 2nd Embodiment of the core material for sandwich panels by this invention. The PP arrow line view of FIG. The QQ arrow line view of FIG.

  Hereinafter, the present invention will be described based on embodiments shown in the drawings.

  FIG. 1 is a partial perspective view showing a first embodiment of a sandwich panel core material according to the present invention. FIG. 2 is an exploded perspective view for explaining a state in which two sandwich panel core materials of FIG. 3 is a partial perspective view of a sandwich panel core formed by stacking two sandwich panel core materials of FIG.

  In FIG. 1, a sandwich panel core material (hereinafter abbreviated as “core material”) 1 includes a plurality of protrusions 4 on the first surface 3 side of a plate 2 and a first flat surface 5 formed around the protrusions 4. And have. The protruding portion 4 is formed so as to protrude from the second surface side 6 of the plate member 2 toward the first surface 3 side with respect to the first flat surface 5. The plurality of protrusions 4 are arranged in a matrix with predetermined intervals in the vertical and horizontal directions.

  In general, there are a truncated octahedron (Kelvin 14-hedron), rhombus dodecahedron, and the like as a polyhedron having a space-filling shape that can fill a space without a gap.

1st Embodiment In this embodiment, the protrusion part 4 makes it the shape which divided | segmented the truncated octahedron in the equator part, and makes a truncated surface a top surface.

  As shown in FIG. 1 and FIG. 2, the protruding portion 4 has a regular hexagonal shape having a rectangular top surface (second flat surface) 41 and each side (referred to as an upper side) 411 of the top surface 41 as a common side. The first side wall surface 42 and a triangular second side wall surface 43 rising from the first flat surface 5 are provided. The top surface 41 is parallel to the first flat surface 5.

  The first side wall surface 42 includes a first ridge line 421 where adjacent first side wall surfaces 42 are joined to each other, a first bottom side 422 which is joined to the first flat surface 5, an end of the first bottom side 422, and a first ridge line 421. And a second ridge line 423 connecting one end of each of the two. The first ridge line 421 has a first joint point 412 at which the upper side 411 of the top surface 41 is joined as a joint point at the other end.

  The 2nd side wall surface 43 makes the 2nd junction point 431 with the end of the 1st ridgeline 421 the triangle vertex. Further, the second side wall surface 43 has the second bottom side 432 joined to the first flat surface 5, and both ends of the second bottom side 432 joined to the end of the first bottom side 422 of the adjacent first side wall surface 42. Further, the third ridge line 433 that forms two sides of the triangle of the second side wall surface 43 shares the second ridge line 423 of the first side wall surface 42.

  Adjacent protrusions 4 are such that the first ridge line 421 is positioned on the same line in the vertical and horizontal directions. Therefore, the space 7 formed by the first side wall surface 42 and the second side wall surface 43 of the four protrusions 4 around the first flat surface 5 forms a space in which the protrusions 4 are filled without a gap.

  The core material 1 can shape | mold the flat plate-shaped board | plate material 2 with the press molding method. From the viewpoint of formability and the like, a gap is provided between the adjacent protrusions 4 and the second side wall surface 43 facing each other. On the first surface 3 side of the plate member 2, the height from the first flat surface 5 to the second junction point 431, which is the apex of the triangle of the second side wall surface 43, between the opposing second side wall surface 43. Ribs 8 are integrally formed.

  On the other hand, as shown in FIG. 3, the second bottom side 432 of the second side wall surface 43 appears as a rib on the second surface 6 side of the plate member 2. Further, the back surface 5 a of the first flat surface 5 appears on the second surface 6 side of the plate member 2, and both ends of the second bottom side 432 extend to the junctions of the respective sides of the back surface 5 a of the first flat surface 5.

  Thus, since the 2nd base 432 of the 2nd side wall surface 43 which functions as a rib is formed in the vertical / horizontal direction of the board | plate material 1, the bending rigidity in the vertical / horizontal direction of the core material 1 can be enlarged. Further, the rib 8 can further increase the bending rigidity of the core material 1 in the vertical and horizontal directions.

  FIG. 2 is an exploded perspective view illustrating a state in which two sandwich panel core materials are overlapped and fitted. The core material 1 shown in FIG. 1 is a first core material, and the same core material as the first core material 1 is a second core material 100. In FIG. 2, for easy understanding, the second core material 100 includes only one protrusion 104 having the same shape as the protrusion 4, and omits the description of the other protrusions 104. Yes. In addition, three axes orthogonal to each other are defined as an X axis, a Y axis, and a Z axis.

  The first surface 3 of the first core material 1 and the first surfaces 3 of the second core material 100 face each other. As shown in FIG. 2, the protruding portion 104 of the second core material 100 is fitted into the space 7 formed in the first core material 1.

  In the first core material 1, the two adjacent projecting portions 4 are formed such that the V-shaped V-shaped plane 11 having the second joint point 431 as a tip is the XZ plane, YZ by the first ridge line 421 facing each other. Each is formed in a plane. When the protruding portion 104 of the second core material 100 is fitted into the space 7 of the first core material 1, the second side wall surface 43 forming the triangle of the protruding portion 104 of the second core material 100 is fitted to the V-shaped plane 11. To do. Four protrusions 104 have four second side wall surfaces 43 arranged at equal intervals in the circumferential direction. Similarly, the four protrusions 4 provide four V-shapes in the space 7 of the first core material 1. A plane 11 is formed. Therefore, when the protruding portion 104 of the second core material 100 is fitted into the space 7 of the first core material 1, the V-shaped plane 11 of each space 7 is filled with the second side wall surface 43 of the protruding portion 104.

  Next, in the protruding portion 104 of the second core material 100, the top surface 41 that is the second flat surface is in contact with the first flat surface 5 of the first core material 1. For example, when the first core material 1 and the second core material 100 are fitted in a state where an adhesive is applied to the first flat surface 5 of the first core material 1 and the second core material 100, the first core material 1 And the second core material 100 are bonded together to form an integrated sandwich panel core.

  Furthermore, the four first side wall surfaces 42 of the protrusions 104 of the second core material 100 are opposed to the first sides of the four protrusions 4 that surround the first flat surface 5 in the space 7 of the first core material 1. The wall faces 42 face each other. The facing width of the first side wall surface 42 facing the protruding portion 104 is narrower toward the tip. Further, the space 7 of the first core material 1 is narrower as the facing width between the facing first side wall surfaces 42 is directed toward the first flat surface 5.

  Therefore, the protruding portion 104 of the second core material 100 is fitted into the space 7 of the first core material 1 until the top surface 41 of the protruding portion 104 contacts the bottom surface of the first flat portion 5. An example in which a machining pitch is opened between the protrusions (4, 104) (a gap of a predetermined length (pitch) is formed between the ends of the protrusions) will be described. In this fitted state, the four first side wall surfaces 42 of the protrusion 104 are opposed to the first side walls 42 of the four protrusions 4 arranged around the space 7 with a gap.

  The description of FIG. 2 exemplifies that the protruding portion 104 provided on the second core material 100 is fitted in the space 7 of the first core material 1. However, since the protruding portion 4 and the space 7 are formed in the second core material 100 similarly to the first core material 1, an opposite fitting relationship also occurs.

  FIG. 3 shows a state in which a concave portion (corresponding to the space 7) and a convex portion (corresponding to the protruding portion 4) respectively formed in both the first core material 1 and the second core material 100 are fitted and adhered by an adhesive. And one sandwich panel core 50 is formed.

  The sandwich panel core 50 of the present embodiment is a fitting structure of the first core material 1 and the second core material 100, and includes a concave portion that is a space 7 formed in both the core materials 1 and 100, and a protruding portion 4. A certain convex part is a space filling shape. For this reason, the uneven | corrugated | grooved part of the 1st core material 1 and the uneven | corrugated | grooved part of the 2nd core material 100 fit mutually without gap. Accordingly, the bending rigidity is increased.

  Moreover, the core materials 1 and 100 of the present embodiment have a structure in which the Kelvin tetrahedron is divided, so that the ratio of the slope is large during the production of the polyhedron, and the formability in machining such as pressing is also improved.

  Furthermore, in this embodiment, the shape of the space 7 that is the concave portion of the core material 1100 and the shape of the protruding portion 4 that is the convex portion is a polyhedral shape, so that the quality does not vary as in the foamed foam material, and is constant. Of the same quality can be manufactured. Also, by adopting a space-filled polyhedron, the concave and convex portions can be made dense, so unlike the core material with a pyramid with a planar filling structure, the concave and convex portions interfere with each other and deform. It becomes difficult to do.

  When a sandwich panel is manufactured by bonding a skin material to both surfaces of the sandwich panel core 50 with an adhesive, the back surface 5a of the first flat surface 5 is formed on the second surface 6 side forming the outer surface of the sandwich panel core 50. Exists. Therefore, when an adhesive is applied to the back surface 5a and the skin material is adhered, the adhesive can be uniformly adhered to the skin material, and can be adhered in a large area. For this reason, even if a large bending stress is applied to the sandwich panel, the core 50 and the skin material are difficult to peel off.

  FIG. 4 is a cross-sectional view of a sandwich panel in which three layers for the sandwich panel shown in FIG. 3 are laminated.

  The sandwich panel 60 shown in FIG. 4 has three layers of sandwich panel cores 50 shown in FIG. 3 and a skin material 70 (shown in FIG. 4 in which the skin material 70 is bonded only on one side) as an adhesive. The structure is bonded by Of course, the number of stacked layers is not limited to three layers, but may be two layers, four layers or more.

  Since the single core 50 has a large adhesive area on both sides, the adhesive force between the cores 50 is strong even in a multilayer structure.

  In the core having the three-layer structure shown in FIG. 4, the width (d) of the protrusion (cell) 4 is 6 mm, the cell thickness (t) is 0.3 mm, and the processing pitch (d) is 1. The bending strength test was performed at 00 mm. The core material was produced with an ink jet type three-dimensional modeling machine. For comparison, a honeycomb core shown in FIG. 6 was manufactured and subjected to a bending strength test using the same inkjet type three-dimensional modeling machine. The cell size (a) of the honeycomb core was 6 mm, and the cell thickness was 0.3 mm.

  Further, a skin material having a thickness of 0.3 mm was bonded to both sides of the core of the present embodiment and the honeycomb core of the comparative example.

  The core material used was an acrylic UV curable resin (trade name: FullCure840 Vero Blue). The bending strength tester is RTC-1325 manufactured by A & D Corporation. Similarly, a bending strength test was conducted on honeycomb cores of the same material and the same height.

  The results of the bending strength test are shown in FIG.

  In FIG. 6, the horizontal axis is displacement (mm), and the vertical axis is the load per unit width (N / mm).

  In this test, due to the difference in the cell shape of the honeycomb core and the sandwich core of the present embodiment, the width of the bending test body could not be made the same, so the load per unit width was divided by each width. Evaluation was performed by bending load.

  The results of the bending test are shown in FIG. From this result, when the panel thickness is the same, the bending rigidity per unit width is higher when the sandwich core of this embodiment is used. Moreover, it can be confirmed that the panel using the sandwich core of the present embodiment does not cause the sandwich core and the skin material to peel off and is broken by the sandwich core.

  As shown in FIG. 6, the skin material peeled off with a displacement of a little less than 5 displacement of the honeycomb core. The load at that time was about 0.4 N / mm. In contrast, the core of the embodiment was displaced by about 13 mm, and the core material was broken at a load of 1.2 N / mm. Moreover, the core of the embodiment has a rigidity 1.74 times that of the honeycomb core.

  Regarding the bending rigidity, the reason why the bending rigidity of the honeycomb core is low is that the honeycomb core is strong against compression of the hexagonal column height method, but is weak in other directions. Therefore, by using the core of the present embodiment of the concavo-convex polyhedron, the strength of the anisotropic direction is improved, and it is also strong against deformation due to bending.

  The core material 1 of the above-described embodiment includes a plate material 2 in which a concave portion (corresponding to the space 7) and a convex portion (corresponding to the protruding portion 4) are formed by dividing the truncated octahedron, which is a space-filled polyhedron, into two parts at the equator portion. Is formed on one surface (corresponding to the first surface 3). Here, the concave portion having a shape obtained by dividing the truncated octahedron into two at the equator portion has a three-dimensional shape in which four convex portions are arranged around the first flat surface 5 forming the bottom surface of the concave portion.

  The present invention is not limited to the truncated octahedron of the above-described embodiment as long as it is a space-filled polyhedron (excluding a hexahedral cube).

Second Embodiment FIGS. 8 to 12 show a second embodiment of the present invention.

  8 is a diagram showing a rhombus dodecahedron, FIG. 9 is a front view showing an upper half of the rhombus dodecahedron shown in FIG. 8 divided by the equator line, and FIG. 10 is a second embodiment of the core material for sandwich panels according to the present invention. 11 is a partial plan view, FIG. 11 is a view taken along the line PP in FIG. 10, and FIG. 12 is a view taken along the line QQ in FIG.

  In the present embodiment, a rhomboid dodecahedron is used as a polyhedron having a space filling shape that constitutes the concavo-convex portion formed in the sandwich panel core material. As shown in FIG. 8, the rhomboid dodecahedron 80 has twelve rhombic wall surfaces A to L. 8 (a) is a front view, FIG. 8 (b) is a top view, FIG. 8 (c) is a right side view, FIG. 8 (d) is a left side view, FIG. 8 (e) is a bottom view, and FIG. f) is a rear view. The rhombus dodecahedron 80 has a symmetrical shape on the front and back surfaces, a symmetrical shape on the left and right side surfaces, and a symmetrical shape on the top and bottom surfaces. The upper half R1 and the lower half R2 are symmetrical with respect to the line segment of the equator line R.

  The height of the side wall surface A and the side wall surface L located at the front center of the front view shown in FIG. 8 (a) and the rear view shown in FIG. 8 (f) is the height H of the rhomboid dodecahedron 80, A vertical plane is formed with respect to a horizontal plane. Further, the upper wall surface F shown in FIG. 8B and the bottom wall surface I shown in FIG. 8E are formed in the same size as the side wall surface A and the side wall surface L, and are formed in parallel to the horizontal plane. Yes. Four sides F1 of the upper wall surface F of the rhombus shape are common to the upper sides of the upper wall surfaces B, C, G, and H, respectively. One side edge where the rhombus-shaped upper wall surface B and the upper wall surface G are joined forms the upper first ridgeline 81, and similarly, one side edge where the rhombus-shaped upper wall surface C and the upper wall surface H are joined is the second upper side. A ridgeline 82 is formed. Further, the other side B1 of the upper wall surface B and the other side C1 of the upper wall surface C are joined to the left and right sides on the upper side of the side wall surface A, respectively. Similarly, the other side G1 of the upper wall surface G and the other side H1 of the upper wall surface H are joined to the left and right sides on the upper side of the side wall surface L, respectively.

  Note that the configuration of the lower half is the same as the configuration of the upper half described above, and a description thereof will be omitted.

  FIG. 9 shows the front of the upper half portion R1 that is divided into two vertically from the rhomboid dodecahedron 80 shown in FIG. The upper half portion R1 is formed on the triangular side wall surface M by dividing the rhomboid side wall surface A and the side wall surface L by the equator line R.

  As shown in FIG. 10, in this embodiment, the upper half portion R <b> 1 is a protruding portion 90 similar to the protruding portion 4 of the first embodiment, and a sandwich panel core material (hereinafter abbreviated as a core material) 300 is formed. . The protrusion 90 has two rhomboid side wall surfaces (first side wall surfaces) B, C, G, H and a triangular side wall surface M (second side wall surface). Then, around the protrusion 90, one side wall surface M is formed between the side wall surface B and the side wall surface C, and the other side wall surface M is formed between the side wall surface G and the side wall surface H. .

  In FIG. 10, the core material 300 includes a plurality of projecting portions 90 on the first surface 303 side of the plate material 302, and a first flat surface 305 formed around the projecting portions 90. The protruding portion 90 is formed so as to protrude from the second surface side 306 of the plate member 302 toward the first surface 303 side with respect to the first flat surface 305. The plurality of protrusions 90 are arranged in a matrix with predetermined intervals in the vertical and horizontal directions.

  The four side wall surfaces B, C, G, and H that form the first side wall surface are joined to the four sides of the wall surface F that forms the second flat surface, and the lower side is joined to the first flat surface 305. Further, the lower side of the side wall surface M forming the second side wall surface is joined to the first flat surface 305.

  In the present embodiment, the space 306 surrounded by the rhombus-shaped side wall surfaces B, C, G, and H of the protrusion 90 disposed around the first flat surface 305 is a recess, and the protrusion 90 is a protrusion. A core material 300 is formed.

  Further, in the protrusions 90 arranged in the direction orthogonal to the ridgelines 81 and 82, the adjacent protrusions 90 face the triangular side wall surface M (second side wall surface) and have a processing pitch (gap). Arranged. A rib 91 indicated by oblique lines is formed in the gap.

  As in FIG. 2, two core members 300 are stacked and fitted to form a sandwich panel core. In FIG. 10, the core material 300 in which the protrusion 90 shown in the actual battle is formed is referred to as a first core material 300, and the core material having the same configuration as that of the first core material 300 is referred to as a second core material 300 ′ indicated by a broken line. Moreover, the code | symbol of the protrusion part formed in 2nd core material 300 'is set to 90'. Each wall surface constituting the protruding portion 90 ′ of the second core material 300 ′ is appended with a symbol (B, C.F, G, H) and a description thereof is omitted. Further, in the second core material 300 ′, members having the same structure as the members of the first core material 300 are denoted by the same reference numerals, followed by “′” and description thereof is omitted.

  As shown in FIGS. 10 and 11, the protruding portion 90 ′ of the second core material 300 ′ is fitted in the space 306 of the first core material 300. By the way, as shown in FIG. 11, an open surface 92 having an open inverted triangle is formed between the protruding portions 90 where the first ridge line 81 and the second ridge line 82 of the first core material 300 face each other. And rib 91 'of 2nd core material 300' is arrange | positioned so that this open surface 92 may be filled.

  Further, one side wall surface H ′ and side wall surface C ′ of one protrusion 90 ′ of the second core material 300 ′ are the same as the side wall surface B of the one protrusion 90 in the n-th row of the first core material 300 and the other. The protruding portion 90 is disposed to face the side wall surface G. The side wall G ′ and the side wall surface B ′ on the other side of one protrusion 90 ′ are the side wall surface C of one protrusion 90 in the (n + 1) th row of the first core material 300 and the side wall H of the other protrusion 90. It is arrange | positioned facing.

  Accordingly, when the protruding portion 90 ′ of the second core material 300 ′ is fitted into the space 306 of the first core material 1, each space 306 is filled with the protruding portion 90 ′.

  Next, in the protruding portion 90 ′ of the second core material 300, the wall surface F ′ forming the top surface that is the second flat surface is in contact with the first flat surface 305 of the first core material 300. For example, the first core material 300 and the second core material 300 ′ are fitted with the adhesive applied to the first flat surfaces 305 and 305 ′ (not shown) of the first core material 300 and the second core material 300 ′. When combined, the first core material 300 and the second core material 300 ′ are bonded to form an integrated sandwich panel core.

  The projecting portion 90 (90 ′) and the space 305 (305 ′) of the second embodiment are formed by fitting the divided portions divided into two with the equator line R of the rhombus dodecahedron 80 forming a space filling shape as a boundary. It is formed in the shape of the concave part and convex part which fit. Therefore, as in the first embodiment, the uneven portion of the first core material 300 and the uneven portion of the second core material 300 ′ are fitted with a slight gap therebetween. Accordingly, the bending rigidity is increased.

  In the first embodiment described above, the first ridgeline 421 is formed at the joining position of the first sidewall surface 42 forming the hexagonal first sidewall surface, and there are two sets of first ridgelines 421 in the orthogonal direction. A plurality of protrusions 4 are arranged in a matrix along two sets of orthogonal first ridge lines 421.

  On the other hand, in the second embodiment, the first ridge line 81 and the second ridge line 82 (first in a plan view) formed at the joining position of the side wall surface B (C) forming the first side wall surface and the side wall surface G (H). A plurality of protrusions 90 are arranged in a matrix along a first direction (row direction) along one ridge line 81) and a second direction (column direction) orthogonal to the first direction. .

  Used in sandwich panels used in structural members such as automobiles, aircraft and buildings, or furniture such as desks.

1, 100, 300, 300 'Core material 2 for sandwich panel 2 Plate material 4, 90, 90' Protruding part (convex part)
41 Top surface (second flat surface) 42 First side wall surface 43 Second side wall surface 5 First flat surface 7, 306 Space (concave portion)
50 Sandwich panel core 60 Sandwich panel 70 Skin material

Claims (12)

A flat first flat surface formed on the first surface side;
A second flat surface parallel to the first flat surface and having a flat surface on the top surface, and having a predetermined interval around the first flat surface, from the second surface side toward the first surface side. A core material for a sandwich panel having a plurality of projecting convex portions and a space formed by the first flat surface and a side wall surface of the plurality of convex portions arranged around the first flat surface as a concave portion Because
The convex portion and the concave portion are formed in the shape of a concave portion and a convex portion in which a divided portion obtained by dividing a polyhedron having a space filling shape into two at the equator portion is fitted to each other. A core material for a sandwich panel having a plurality of first side wall surfaces of a polygonal plane and a plurality of second side wall surfaces of a second polygonal plane.   The one side of the plurality of first side wall surfaces is joined to each side of the top surface, and the bottom side of the second side wall surface is joined to the first flat surface. Core material for sandwich panels.   The plurality of convex portions are arranged on the same line in accordance with a first ridge line where adjacent first side wall surfaces are joined to each other and an orthogonal line orthogonal to the first ridge line. The core material for sandwich panels as described in 1.   4. The core material for a sandwich panel according to claim 1, wherein the plurality of convex portions are arranged such that adjacent convex portions have a gap. 5.   The core material for a sandwich panel according to any one of claims 1 to 4, wherein the polyhedron having the space filling shape is a truncated octahedron.   The said 2nd side wall surface is a triangular plane, Comprising: The core material for sandwich panels of Claim 5 facing the 2nd side wall surface of the adjacent convex part.   The core material for a sandwich panel according to any one of claims 1 to 4, wherein the polyhedron forming the space filling shape is a rhomboid dodecahedron.   The second side wall surface is a triangular plane whose apex extends to the second flat surface, and is formed to face each other in a direction orthogonal to the ridge line where the first side wall surfaces are joined to each other, and the second side wall surface of the adjacent convex portion The core material for sandwich panels according to claim 7, wherein   The core material for a sandwich panel according to claim 6 or 8, wherein the second side wall surfaces facing each other of the adjacent convex portions are joined by ribs.   A sandwich panel core material according to any one of claims 1 to 9, wherein the first core material and the other core material are opposed to each other with their first surfaces facing each other. A sandwich panel core formed by bonding with an adhesive.   A core for a sandwich panel, wherein a plurality of the cores for a sandwich panel according to claim 10 are laminated, and each lamination is adhered with an adhesive.   12. A sandwich panel characterized in that a skin material is bonded to both surfaces of the sandwich panel core according to claim 10 or 11 via an adhesive.