JP4052981B2 - Honeycomb core and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a honeycomb core used for a honeycomb structure member and a manufacturing method thereof.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a honeycomb structural member configured by bonding a plate material to the outer surface of a honeycomb core having a polygonal cavity, such as a honeycomb, is well known (see, for example, Non-Patent Document 1).
[0003]
By the way, since such a honeycomb structure member is lightweight and strong against bending, it is widely used for a frame member of a vehicle, a skeleton member of a concrete frame of a building, and the like.
[0004]
[Non-Patent Document 1]
Mechanical Engineering Dictionary The Japan Society of Mechanical Engineers First edition issued on August 20, 1997 [0005]
[Problems to be solved by the invention]
By the way, the conventional honeycomb core that becomes the skeleton of the honeycomb structural member has a complex shape portion of a honeycomb shape, and is configured by joining a plurality of plate materials by a joining means such as welding. . Therefore, there is a problem that joining work such as troublesome and troublesome welding is required, which causes a high cost, and further, a low-strength part is locally generated, and in order to compensate for this, the plate material is compensated. There is a problem that the wall thickness tends to increase, and the weight reduction that is the original characteristic of the honeycomb structure member is impaired.
[0006]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a novel honeycomb core and a method for manufacturing the same, which can form the honeycomb core from a single blank so as to solve the above problems. And
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a honeycomb core formed by bending a blank, and is rectangular with a space in the longitudinal direction at the center in the width direction of the blank. a plurality of through holes along the longitudinal direction over its entire width with column set by forming a corrugated surface having alternating with flat surface and the inclined surface of the bend machining of the blank, inter a plurality of through-holes A plurality of rectangular base end walls arranged in a row across the base, and a pair of left and right side walls that are bent upright from both sides of each base end wall and face each other with a gap therebetween, The pair of side walls includes a plurality of polygonal cylinder portions arranged in the longitudinal direction with a gap in the corrugated surface, and the adjacent polygonal cylinder portions are formed of the base end wall and the pair of side walls. Integrated by connecting wall part with U-shaped cross section Connect, flat outer surface of the respective proximal wall, characterized in that the welded surface capable of welding the other member in a surface contact state.
[0008]
According to such a feature, the honeycomb core is formed from a single blank and has no welded portion. Therefore, the honeycomb core has a uniform and high strength throughout the entire area, does not have a locally low strength portion, and is lightweight. In addition, high strength can be obtained, and since no welding means is required, the manufacturing cost can be greatly reduced. Furthermore, since it has a uniform strength over the entire region, the desired strength can be ensured even if it is formed of a thin material.
[0009]
In order to achieve the above object, according to a second aspect of the present invention, in the honeycomb core according to the first aspect, the inclined surface of the polygonal cylindrical portion of the pair of side walls has one end to the other end in the height direction. A wedge-shaped folded portion that gradually becomes deeper toward the surface is recessed, and the bent portion is bent toward the wall surface of the pair of side walls starting from the folded portion.
[0010]
According to such a feature, the honeycomb core is formed from a single blank and has no welded portion. Therefore, the honeycomb core has a uniform and high strength throughout the entire area, does not have a locally low strength portion, and is lightweight. In addition, high strength can be obtained, and since no welding means is required, the manufacturing cost can be greatly reduced. Furthermore, since it has a uniform strength over the entire area, it can guarantee the expected strength even if it is formed of a thin material, and in addition, it can be bent with a reduced elongation rate of the plate material constituting the honeycomb core. Therefore, it becomes possible to bend the honeycomb core in the longitudinal direction by using the high-tensile steel having a low elongation rate, and it is possible to provide a honeycomb core with a bent portion that is lighter and has higher strength.
[0011]
Moreover, in order to achieve the said objective, invention of Claim 3 is a manufacturing method of the honeycomb core shape | molded by the bending process of the blank of 1 sheet | seat, Comprising: The longitudinal direction is the center part of the width direction of the said blank. A plurality of rectangular through-holes arranged at intervals, and a piercing step for forming a plurality of rectangular base end walls arranged in a row with the through-holes in between, and the entire width of the blank A first bend step of forming a corrugated surface having flat surfaces and inclined surfaces alternately in the longitudinal direction, and the blank is bent upright from both sides of each base end wall at a substantially right angle, A second bend step for forming a pair of left and right side walls facing each other with a gap therebetween, wherein the pair of left and right side walls form a plurality of polygonal cylinder portions open at both ends with a gap in the longitudinal direction. And next to each other in cooperation with the base wall Polygonal cylindrical portion that fits the Ri Na to form a U-shaped cross section of the connecting wall portion connecting together, the flat outer surface of the respective proximal wall, the welded surface capable of welding the other member in a surface contact state It is characterized by that.
[0012]
According to such a feature, there is no welded part formed by a single blank, it has a uniform high strength over the entire area, there are no locally low strength parts, it is lightweight, and it has high strength This honeycomb core can be manufactured, and since no welding means is required, the manufacturing cost can be greatly reduced. Furthermore, since it has a uniform strength over the entire area, it can be manufactured with a thin material, and the manufacturing cost can be further reduced.
[0013]
Furthermore, in order to achieve the above object, the invention according to claim 4 is the method according to claim 3, wherein the height of the inclined surface of the polygonal cylinder portion of the pair of side walls is increased after the second bend step. A wedge-shaped folded portion that gradually becomes deeper from one end to the other in the direction, and a third bending step of bending the folded portion toward the wall surface of the pair of side walls starting from the folded portion.
[0014]
According to such a feature, there is no welded part formed by a single blank, it has a uniform high strength over the entire area, there are no locally low strength parts, it is lightweight, and it has high strength This honeycomb core can be manufactured, and since no welding means is required, the manufacturing cost can be greatly reduced. Furthermore, since it has a uniform strength over the entire area, it can be manufactured with a thin material, further reducing the manufacturing cost, and bending with less elongation of the plate material constituting the honeycomb core. Therefore, it becomes possible to bend the honeycomb core in the longitudinal direction by using a high-tensile steel with a low elongation rate, and it is possible to manufacture a honeycomb core with a bent portion that is lighter and has higher strength.
[0015]
Furthermore, in order to achieve the above object, the invention according to claim 5 is a double row honeycomb core formed by double row forming the honeycomb core according to claim 1 by bending a single blank, A pair of honeycomb cores adjacent to each other is characterized in that the inclined portions of the side walls located in the adjacent portions of the two honeycomb cores are shared with each other, and the polygonal cylindrical portions of the honeycomb cores are arranged in a zigzag shape.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.
[0017]
First, a description will be given of a first embodiment in which the honeycomb structure material using the honeycomb core HC of the present invention is applied to a subframe of a vehicle.
[0018]
1 to 8 show a first embodiment of the present invention. FIG. 1 is a plan view of a subframe of a vehicle using a honeycomb structure material using the honeycomb core of the present invention, and FIG. 2 is a plan view of FIG. 3 is an enlarged cross-sectional view taken along line 2-2, FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2, FIG. 4 is an exploded perspective view of the honeycomb core and the outer plate, and FIG. FIG. 6 is a diagram showing a first bend process and a cutting process, FIG. 6 is a diagram showing a second bend process of the honeycomb core, FIG. 7 is a top view of a lower bend die as viewed in the direction of arrow 7 in FIG. FIG. 8 is a bottom view of the upper bend die as viewed in the direction of arrow 8 in FIG. 6.
[0019]
In FIG. 1, a subframe SF is fixed on a main frame MF of a vehicle, and a honeycomb structure member is used for a cross member CM of the subframe SF. As shown in FIGS. 2 to 4, the honeycomb structure member includes a honeycomb core HC (detailed later) according to the present invention and an outer plate AP welded to the outer surface of the honeycomb core HC. Is formed in a U-shaped cross section and covers the front and rear side surfaces and the bottom surface of the honeycomb core HC.
[0020]
Next, the structure of the honeycomb core HC according to the present invention will be described. As shown in FIGS. 4 to 6, the honeycomb core HC is formed by a blank 1 made of a single high-strength steel plate and a piercing, After being bent, cut, and second bend processed, it is configured as an elongated structure having a concave cross section with one end surface (upper surface) open, and is arranged in parallel at a distance from each other. 2 side walls (front side wall, rear side wall) 11 and 12, and one end edge (lower edge) of the two side walls are integrally connected to each other, and a plurality of rectangular base end walls juxtaposed at intervals in the longitudinal direction of the blank ( Bottom surface) 10 and a surface (upper surface) facing the base end wall 10 is open. The honeycomb core HC has a plurality of polygonal tube portions 14 arranged in a row in the longitudinal direction, and the adjacent polygonal tube portions 14 are integrated by a narrow connection wall portion 15. Connected.
[0021]
The specific structure of the honeycomb core HC will be described in detail below together with the step of forming the honeycomb core HC from a single blank 1.
[Piercing process]
As shown in FIG. 5, the blank 1 of the high-tensile steel plate drawn out from the coil material is pierced at a piercing station. The blank 1 is inserted between the fixed die 20 provided in the piercing station and the movable punch 21 and the punch 21 is moved up and down by a lifting / lowering drive means (not shown), whereby the blank 1 has a pierce. Processing is done. By this piercing process, as shown in FIG. 5, a plurality of rectangular through-holes 2 are arranged at predetermined intervals along the longitudinal direction of the strip-shaped blank 1 at the center in the width direction. Is done.
[First bend process]
The blank 1 after the piercing process is sent to the first bend station. The first bend station is provided with a pair of bend tooth rings 30 and 32 symmetrically. These bend tooth rings 30 and 31 are driven in directions opposite to each other by driving means (not shown). Formed teeth 31 and 33 are formed on the outer circumferences of the pair of bend tooth rings 30 and 32, and a part of these formed teeth 31 and 33 mesh with each other. A blank 1 after piercing is inserted between the pair of tooth rings 30 and 32 to perform a first bend. By this first bending process, as shown in FIG. 5, the corrugated surface 3 is continuously formed on the blank 1 along the length of the blank 1. The corrugated surface has mountain folds 6 and valley folds 7, and flat surfaces 4 and inclined surfaces 5 are alternately formed.
[0022]
[Cut process]
The blank 1 after the first bend molding is sent to the cutting station. The cut station is provided with a fixed cut die 40 and a movable cut punch 41 corresponding to the fixed cut die 40, and the blank 1 enters between the cut die 40 and the cut punch 41. As shown in FIG. 5, the belt-shaped blank 1 is cut to a predetermined length, in this embodiment, the length of the cross member CM of the subframe SM, by the lowering operation of the cutting punch 41 by a driving means (not shown). .
[0023]
As shown in FIG. 5, the blank 1 that has undergone the cutting process becomes a strip-shaped semi-finished product 1 </ b> H in which a plurality of pierce holes, that is, through-holes 2.
[0024]
[Second bend process]
The strip-shaped semi-finished product 1H is sent to the second bend station shown in FIG. The second bend station is provided with a fixed bend die 50 and a movable bend punch 51 corresponding thereto. The bend punch 51 can be moved up and down with respect to the bend die by a driving means (not shown), and the second product is subjected to the second bend processing on the semi-finished product 1H that enters between them.
[0025]
As shown in FIGS. 6 and 7, the bend die 50 is formed with a female mold 50F having a concave cross section on the upper surface thereof. The female mold 50F includes a concave groove 50Fa in the center in the width direction and its concave. An uneven mold 50Fb in which peaks and valleys are alternately formed across the groove 50Fa is formed in two rows. The upper surface of the mold 50Fb is engaged with the corrugated surface 3 of the semi-finished product 1H. It is formed as follows. On the other hand, the bend punch 51 is formed in a T-shaped cross section as shown in FIGS. 6 and 8, and a male molding die 51M is formed on the lower surface thereof. It is fitted to the female mold 50F.
[0026]
After the semi-finished product 1H is entered between the bend die 50 and the bend punch 51, the bend punch 51 is lowered toward the bend die 50 by a driving means (not shown), so that the male mold 51M of the bend punch 51 becomes the female of the bend die 50. The semi-finished product 1H is fitted into the mold 50F and clamped, whereby the semi-finished product 1H has a plurality of base ends arranged in a row with a plurality of rectangular through holes 2 arranged at intervals in the center in the width direction. The left and right side plates 11 and 12 that are paired by bending the left and right side portions of the wall 10 upward at a substantially right angle are formed upright to form the honeycomb core HC according to the present invention.
[0027]
As shown in FIGS. 2 to 4, the honeycomb core HC is formed in a concave shape in cross section, and the left and right corrugated side plates 11 and 12 face each other with a space therebetween, so that there is a space in the longitudinal direction. A plurality of polygonal cylindrical portions 14 open at the upper and lower end surfaces are formed in series with a space therebetween, and between the adjacent polygonal cylindrical portions 14, 14, the flat surfaces and proximal ends of the left and right side wall plates 11, 11 The connecting wall portions 15 made of the wall 10 are integrally connected, and the lower edges of the polygonal tube portions 14 are connected by the base end wall 10.
[0028]
As shown in FIG. 4, the honeycomb core HC is inserted into the outer plate AP having a U-shaped cross section along the wall surface direction of the polygonal cylindrical portion 14. As shown in FIGS. 2 and 3, the outer surface of the flat surface 4 of the plurality of polygonal tube portions 14 of the honeycomb core HC and the left and right side surfaces of the outer plate AP are fixed by spot welding 17 and the honeycomb core HC. The bottom surface of the base plate, that is, the base wall 10 and the back wall of the outer plate AP are fixed by spot welding 18. Thus, the plurality of base end walls 10 are connected to each other by the outer plate AP, and the flat outer surface of each base end wall 10 is a welded surface to which the outer plate AP can be welded.
[0029]
The honeycomb structure member is configured as described above. And in this 1st Example, as shown in FIG. 1, this honeycomb structure member makes the height direction of the polygonal cylinder part 14 of the honeycomb core HC face the up-down direction, and the back wall of the outer plate AP faces up. Then, the both end portions are welded to the left and right vertical frames of the sub-frame SF to be used as the cross member CM.
[0030]
Thus, the cross member CM is light in weight and high in strength by being formed in a honeycomb structure. In particular, the honeycomb core HC constituting the skeleton of the cross member CM is formed by a single blank 1. Since there is no welded portion, the manufacturing cost can be greatly reduced, and evenly high strength can be maintained over the entire region, and locally low strength portions are not generated.
[0031]
Next, a second embodiment of the present invention will be described with reference to FIGS.
[0032]
The second embodiment is a case where the honeycomb structure member provided with the honeycomb core HC according to the present invention is applied to the bumper of the vehicle. FIG. 9 is a plan view when the honeycomb structure member is applied to the bumper. Is an enlarged cross-sectional view taken along line 10-10 in FIG. 9, FIG. 11 is an exploded perspective view of the bumper, FIG. 12 is a partial perspective view of the honeycomb core, and FIG. 13 is an enlarged partial view in FIG. FIG. 14 is a perspective view of the honeycomb core and its bending mold, FIG. 15 is a view taken along arrow 15 in FIG. 14, and FIG. 16 is a view taken along arrow 16 in FIG.
[0033]
In the second embodiment, the straight honeycomb core formed in the first embodiment is bent in the wall surface direction so that it can be applied to a bumper of a vehicle. The honeycomb core HC of the first embodiment is used. The third bend processing described below is added to the above.
[0034]
As shown in FIGS. 9 to 11, the bumper BP has upper, lower outer plates APu, AP1 and front, rear, respectively, on the upper and lower surfaces and front and rear surfaces of the honeycomb core HC bent into a plane bow shape by the third bend processing. The outer plates APf and APr are fixed by welding, and a synthetic resin absorber AS is fixed to the front surface thereof.
[0035]
Next, the third bend processing of the honeycomb core HC will be described.
[Third bend process]
The straight honeycomb core HC (same as in the first embodiment) is sent to the third bend station in the vertical direction, that is, its polygonal cylindrical portion 14. As shown in FIG. 14, the third bend station is provided with an upper bend mold 60 and a lower bend mold 61. As shown in FIGS. 14 and 15, the upper bend die 60 is provided with a female molding die 60F having a planar polygonal shape and open portions 60Fc on the left and right, and the four inclined corner surfaces 60Fa of the female molding die 60F are arranged from above. Each of the peaks 60Fb... Having a V-shaped cross-section in which the peaks gradually increase toward the bottom is formed inward. On the other hand, as shown in FIGS. 14 and 16, the lower bend mold 61 includes a male mold 61M having a planar polygonal shape and extending portions 61Mc on the left and right, and the four inclined corner surfaces 61Ma of the male mold 61M. A trough 61Mb having a V-shaped cross section is formed in which the trough gradually becomes shallower from bottom to top.
[0036]
As shown in FIG. 14, between the upper bend mold 60 and the lower bend mold 61, the honeycomb core HC is entered so that the height of the polygonal cylindrical portion 14 is directed in the vertical direction. When the mold 61 is clamped, as shown in FIGS. 12 and 13, the four inclined corner surfaces of the polygonal tube portions 14 of the honeycomb core HC are formed with folds 8 along the vertical direction, respectively. The folded portions 8 have a V-shaped cross section, and are formed with wedge grooves that gradually become shallower from the bottom to the top. The honeycomb core HC is bent in the direction of the wall surface of the polygonal cylindrical portion 14 as shown by arrows in FIGS. Accordingly, the folded portions 8 are selectively formed at some positions of the plurality of polygonal cylinder portions 14 at intervals, and in this embodiment, the honeycomb structure is formed at three positions as shown in FIG. The core HC can be bent in the direction of the wall surface of the polygonal cylinder portion 14 and can follow the bumper BP shape of the vehicle.
[0037]
On the upper and lower surfaces of the honeycomb core HC bent into the bumper BP shape, that is, the upper and lower flat surfaces 4 of the plurality of polygonal tube portions 14, the belt-like upper and lower outer plates APu and AP1 are spot welded 63 and 64, respectively. is, also in the and the rear end face (outer surface of the proximal end wall 10) the front of the honeycomb core HC, before the strip, the rear outer plate APf, APr is spot welded 65 and 66, respectively. Further, a synthetic resin absorber AS is fixed to the front surface of the honeycomb core HC, and as shown in FIG. 9, a vehicle bumper BP is manufactured. And this bumper BP is attached to the front surface of the vehicle body which is not shown in figure.
[0038]
The bumper BP is light in weight and high in strength by being formed into a honeycomb structure. In particular, the honeycomb core HC constituting the skeleton of the bumper BP is formed by one blank 1 and welded. Since the portion does not exist, not only the manufacturing cost can be greatly reduced, but also a uniform high strength can be maintained over the entire region, and a locally low strength portion does not occur. In addition, since the honeycomb core HC can be bent with a reduced elongation rate of the metal plate constituting the honeycomb core HC, it becomes possible to bend the honeycomb core HC in the longitudinal direction with high-frequency tensile steel having a low elongation rate. It is possible to provide a bumper that is lighter and has higher strength.
[0039]
Next, a third embodiment of the present invention will be described with reference to FIG.
[0040]
The third embodiment is a double row honeycomb core formed by double row of honeycomb cores according to the present invention, and FIG. 17 is a perspective view of the double row honeycomb core.
[0041]
In the third embodiment, a piece of blank or al the honeycomb core of the first embodiment is obtained by double row forming a pair of side walls 11 and 12 of the honeycomb core HC is the other adjacent honeycomb core HC Shared on the side wall. Further, the polygonal cylindrical portions 14 of the adjacent honeycomb cores HC are arranged in a zigzag shape.
[0042]
Therefore, the double row honeycomb core of the third embodiment also has the same effect as the first embodiment.
[0043]
As mentioned above, although the Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention.
[0044]
For example, in the above-described embodiment, the case where the honeycomb core according to the present invention is applied to a structural member for a vehicle has been described, but this is used as a structural member for a building or other equipment such as a skeleton member of a building frame. Can be used.
[0045]
【The invention's effect】
As described above, according to the first aspect of the present invention, since there is no welded portion formed by a single blank, it has a uniform high strength over the entire area, and there is no locally low strength portion. In addition, a lightweight and high-strength honeycomb core can be obtained, and since no welding means is required, the manufacturing cost can be greatly reduced. Furthermore, since it has a uniform strength over the entire region, the desired strength can be ensured even if it is formed of a thin material.
[0046]
Further, according to the invention of claim 2, in addition to the effect of the invention of claim 1, since the plate material constituting the honeycomb core can be bent with a low elongation rate, the high-frequency tension with a low elongation rate can be obtained. Steel makes it possible to bend the honeycomb core in the longitudinal direction thereof, and to provide a honeycomb core having a bent portion that is lighter and has higher strength.
[0047]
In addition, according to the invention described in claim 3, it is formed by a single blank, there is no welded portion, it has a uniform high strength over the entire area, there are no locally low strength portions, and it is lightweight. In addition, a high-strength honeycomb core can be manufactured, and since no welding means is required, the manufacturing cost can be greatly reduced. Furthermore, since it has a uniform strength over the entire area, it can be manufactured with a thin material, and the manufacturing cost can be further reduced.
[0048]
Furthermore, in addition to the effect of the invention of claim 3, the invention of claim 4 can be bent with a reduced elongation rate of the plate material constituting the honeycomb core, so that the high-frequency tensile steel having a low elongation rate, etc. Thus, the honeycomb core can be bent in the longitudinal direction thereof, and a honeycomb core having a bent portion that is lighter and has higher strength can be manufactured.
[Brief description of the drawings]
FIG. 1 is a plan view of a vehicle subframe using a honeycomb structure member using a honeycomb core (first embodiment).
2 is an enlarged sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. FIG. 4 is an exploded perspective view of the honeycomb core and outer plate. FIG. 6 is a view showing a second bend process of the honeycomb core. FIG. 7 is a top view of the lower mold for the bend as viewed from the arrow 7 in FIG. FIG. 8 is a bottom view of the upper mold of the bend as viewed in the direction of arrow 8 in FIG. 6. FIG. 9 is a plan view when the honeycomb structure member is applied to the bumper (second embodiment).
Fig. 10 is an enlarged sectional view taken along line 10-10 in Fig. 9. Fig. 11 is an exploded perspective view of the bumper. Fig. 12 is a partial perspective view of the honeycomb core. Fig. 13 is an enlarged partial view taken along arrow 13 in Fig. 12. 14] Perspective view of honeycomb core and its bending mold [FIG. 15] FIG. 15 is a view taken along arrow 15 [FIG. 16] FIG. 16 is a view taken along arrow 16 [FIG. 17] A perspective view of a double row honeycomb core (third embodiment) )
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Blank 2 ... Through-hole 3 ... Corrugated surface 4 ... Flat surface 5 ... Inclined surface 8 ... Folding part 10 ... Base end wall 11 ... .... Side wall 12 ... Side wall 14 ... Polygonal cylinder part 15 ... Connection wall part

Claims (5)

A honeycomb core formed by bending a single blank (1),
In the central part in the width direction of the blank (1), a plurality of rectangular through holes (2) are arranged at intervals in the longitudinal direction, and a flat surface (4) and an inclination are formed along the longitudinal direction over the entire width. Forming a corrugated surface (3) having alternating surfaces (5),
By bending the blank (1), a plurality of rectangular base end walls (10) arranged in a row with the plurality of through holes (2) interposed therebetween, and both sides of each base end wall (10) A pair of left and right side walls (11, 12) that are bent upright at a substantially right angle from each other and face each other with a gap therebetween,
The pair of side walls (11, 12) has a plurality of polygonal tube portions (14) arranged at intervals in the longitudinal direction by the corrugated surface (3), and adjacent polygon tube portions (14 ) and integrally connected to said by each base end wall (10) and a U-shaped connecting wall portion formed out with a pair of side walls (11, 12) (15),
The honeycomb core according to claim 1, wherein the flat outer surface of each base end wall (10) is a welded surface capable of welding the other members (AP, APf) in a surface contact state .   On the inclined surface (5) of the polygonal tube portion (14) of the pair of side walls (11, 12), a wedge-shaped fold (8) gradually deepening from one end to the other end in the height direction is recessed. The honeycomb core according to claim 1, wherein the honeycomb core is formed by being bent and bent toward the wall surface direction of the pair of side walls (11, 12) with the folded portion (8) as a starting point. A method for manufacturing a honeycomb core formed by bending a blank (1),
A plurality of rectangular through holes (2) are arranged in the center in the width direction of the blank (1) with an interval in the longitudinal direction, and the rows (2) are sandwiched between them. A piercing step of forming a plurality of rectangular base end walls (10) arranged in a row,
A first bend step of forming a corrugated surface (3) having alternately flat surfaces (4) and inclined surfaces (5) in the longitudinal direction over the entire width of the blank (1);
The blank (1) is bent upright at substantially right angles from both sides of each base end wall (10) to form a pair of left and right side walls (11, 12) facing each other with a gap therebetween. A bend process,
The pair of left and right side walls (11, 12) form a plurality of polygonal tube portions (14) open at both ends at intervals in the longitudinal direction and cooperate with the base end wall (10). Ri adjacent polygonal tube portion (14) Na to form a U-shaped cross section of the connecting wall portion connecting together (15),
The method for manufacturing a honeycomb core according to claim 1, wherein the flat outer surface of each base end wall (10) is a welded surface capable of welding the other members (AP, APf) in a surface contact state .   After the second bend step, a wedge-like shape gradually becomes deeper from one end in the height direction to the other end on the inclined surface (5) of the polygonal tube portion (14) of the pair of side walls (11, 12). The said bending part (8) is shape | molded, The 3rd bending process of bending to the wall surface direction of said pair of side wall (11, 12) from this folding part (8) as a starting point is included, The said Claim 3 characterized by the above-mentioned. A method for manufacturing a honeycomb core. A double-row honeycomb core formed by double-row forming the honeycomb core according to claim 1 by bending a single blank (1),
The pair of honeycomb cores (HC) adjacent to each other share the inclined portions of the side walls (11, 12) located adjacent to each other, and the polygonal cylindrical portion (14) of each honeycomb core (HC) A double-row honeycomb core characterized by being arranged in a zigzag manner.

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