JP7111065B2 - Roll forming equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll forming apparatus for forming by passing a metal sheet between a pair of rolls rotating in opposite directions.

Patent Literature 1 discloses, for example, a roll forming apparatus used for forming a porous flow path plate that constitutes a part of a fuel cell. This roll forming apparatus includes a first roll and a second roll arranged in a state facing the first roll. The first roll is formed by laminating a plurality of first cutting edges in the axial direction. The second roll is formed by laminating a plurality of second cutting edges in the axial direction.

The roll forming device has a plurality of cutting blade pairs in the axial direction, each of which is composed of a first cutting blade and a second cutting blade that face each other in the direction in which the first roll and the second roll are arranged. The plurality of cutting blade pairs include a wavy portion forming blade pair for forming a wavy portion having projections projecting in the same direction from the reference position in the arrangement direction. Then, the metal sheet passed between the first roll and the second roll, which are rotated in opposite directions to each other, is sheared by each pair of cutting blades for the wavy portion and the pair of cutting blades on both sides thereof to form the wavy portion. be.

In order to properly shear the metal sheet, the roll forming apparatus requires a shear clearance between the first cutting edge on one of the adjacent cutting edge pairs and the second cutting edge on the other. . In order to form this shear clearance, in Patent Document 1, a separate member such as a shim is sandwiched between adjacent cutting edges, or the outer peripheral portion of each cutting edge is subjected to additional processing such as cutting. there is

Japanese Unexamined Patent Application Publication No. 2013-146770

However, in the method of forming the shear clearance with a separate member such as a shim, a separate member is required in addition to the cutting edge. In addition, it is necessary to insert a separate member between the adjacent cutting edges, which is time-consuming and inefficient. On the other hand, in the method of forming the shear clearance by additional processing, it is necessary to perform processing such as cutting on the outer peripheral portion of each of the plurality of cutting edges, which is also troublesome.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to provide a roll forming apparatus capable of easily forming a shear clearance without sandwiching a separate member or performing additional processing. is to provide

In the roll forming apparatus for solving the above problems, a first roll in which a plurality of first cutting edges are laminated in the axial direction and a second roll in which a plurality of second cutting edges are laminated in the axial direction are opposed to each other. A plurality of cutting blade pairs consisting of the first cutting blade and the second cutting blade arranged in a state in which the first roll and the second roll are arranged and opposed to each other in the direction of arrangement of the first roll and the second roll are provided in the axial direction, and a plurality of the cutting blades The blade pairs include two types of wavy portion cutting blade pairs for forming wavy portions having protrusions projecting in the same direction from the reference position in the arrangement direction, and the first roll rotated in opposite directions to each other. and a roll forming device for forming the wavy portion while shearing the metal sheet passed between the second rolls by the wavy portion cutting blade pairs and the cutting blade pairs on both sides thereof, wherein each wavy portion The thicknesses of the first cutting edge and the second cutting edge in the pair of cutting edges in the axial direction are different from each other, and the first cutting edge is arranged so that the thin cutting edge is positioned in the axially central portion of the large cutting edge. The roll and the second roll are positioned in the axial direction, and the two types of the pair of cutting edges for the wavy portion are such that the first cutting edge has a greater thickness than the second cutting edge; The second cutting edge has a greater thickness than the first cutting edge, and the two types of cutting edge pairs for the wavy portion are alternately arranged in the axial direction, and the adjacent cutting edge pairs At least one of them is composed of the pair of cutting edges for the waved portion.

According to the above configuration, in a state in which the first roll and the second roll are positioned in the axial direction, the thickness of the first cutting edge is greater than the thickness of the second cutting edge in the wavy portion cutting edge pair, The surfaces on both sides of the second cutting edge in the axial direction are located at positions separated from the surfaces on both sides of the first cutting edge by the same length in the axial direction. The first cutting edge of the cutting edge pair adjacent to the wavy portion forming blade pair overlaps the thicker first cutting edge of the wavy portion forming blade pair. The second cutting edge of the adjacent cutting edge pair overlaps the thin second cutting edge of the corrugated portion forming edge pair. Therefore, a clearance is formed between the thin second cutting edge of the waved portion cutting edge pair and the first cutting edge of the adjacent cutting edge pair. Therefore, it is possible to form the shear clearance by using the first cutting edge having a large thickness and the second cutting edge having a small thickness in the pair of cutting edges for the waved portion, each having an appropriate thickness.

Further, in the pair of wavy portion cutting blades in which the thickness of the first cutting blade is smaller than the thickness of the second cutting blade, the surfaces on both sides of the first cutting edge in the axial direction are separated from the surfaces on both sides of the second cutting edge by They are located at locations spaced apart by the same length in the axial direction. The first cutting edge of the cutting edge pair adjacent to the wavy portion forming blade pair overlaps the thin first cutting edge of the wavy portion forming blade pair. The second cutting edge of the adjacent cutting edge pair overlaps the thicker second cutting edge of the corrugated portion forming edge pair. Therefore, a clearance is formed between the thin first cutting edge of the wavy portion cutting edge pair and the second cutting edge of the adjacent cutting edge pair. Therefore, it is possible to form the shear clearance by using the first cutting edge with a small thickness and the second cutting edge with a large thickness in the pair of cutting edges for the waved portion, each having an appropriate thickness.

In the above-described roll forming apparatus, a flat portion having no portion protruding from the reference position in the arrangement direction is provided next to at least one of the wavy portion forming blade pairs in the axial direction in the plurality of the blade pairs. It is preferable that a pair of cutting blades for forming a flat portion is included, and in the pair of cutting blades for a flat portion, the first cutting blade and the second cutting blade having the same thickness are used.

According to the above configuration, the thickness of the first cutting edge in the axial direction is greater than the thickness of the second cutting edge, and the first cutting edge of the flat portion cutting edge pair located adjacent to the wavy portion cutting edge pair is greater than the thickness of the second cutting edge. The blade is superimposed on the thicker first cutting edge of the wavy cutting edge pair. The second cutting edge of the pair of cutting blades for the flat portion overlaps the second cutting edge of the pair of cutting blades for the wavy portion and having a small thickness. Therefore, a clearance is formed between the thin second cutting edge of the wavy portion cutting edge pair and the first cutting edge of the adjacent flat portion cutting edge pair. Therefore, it is possible to form the shear clearance by using the first cutting edge having a large thickness and the second cutting edge having a small thickness in the pair of cutting edges for the waved portion, each having an appropriate thickness.

In addition, the first cutting edge in the pair of cutting edges for a flat portion located adjacent to the pair of cutting edges for a wavy portion, in which the thickness of the first cutting edge in the axial direction is smaller than the thickness of the second cutting edge, has the above-described wavy shape. It is superimposed on the thin first cutting edge in the pair of cutting edges for the part. The second cutting edge of the pair of cutting edges for the flat portion is superimposed on the second cutting edge of the pair of cutting edges for the wavy portion. Therefore, a clearance is formed between the thin first cutting edge of the pair of cutting edges for the wavy portion and the second cutting edge of the adjacent pair of cutting edges for the flat portion. Therefore, it is possible to form the shear clearance by using the first cutting edge with a small thickness and the second cutting edge with a large thickness in the pair of cutting edges for the waved portion, each having an appropriate thickness.

In the roll forming apparatus, the two types of wavy portion forming blade pairs are adjacent to each other in the axial direction, and the flat portion forming blade pairs are provided on both sides of the wavy portion forming blade pairs in the axial direction. is preferably arranged.

According to the above configuration, the thickness of the first cutting edge in the wavy portion cutting edge pair located adjacent to the wavy portion cutting edge pair, in which the thickness of the first cutting edge is greater than the thickness of the second cutting edge. is smaller than the thickness of the second cutting edge. Therefore, the first cutting edge having a large thickness in one pair of cutting blades for the wavy portion overlaps the first cutting edge having a small thickness in the other pair of wavy portion forming blades. The second cutting edge having a small thickness in one pair of cutting blades for the wavy portion overlaps the second cutting edge having a large thickness in the other pair of wavy portion forming blades.

Therefore, a clearance is formed between the thin second cutting edge of one pair of wavy portion forming blades and the thin first cutting edge of the adjacent wavy portion forming blade pair. Therefore, it is possible to form the shear clearance by using the first cutting edge and the second cutting edge in each pair of cutting edges for the wavy portion, each having an appropriate thickness.

In the roll forming apparatus, a pair of first collars are arranged on both sides of the first roll in the axial direction, a pair of second collars are arranged on both sides of the second roll in the axial direction, and It is preferable that the first collar and the second collar facing each other have different thicknesses in the axial direction.

In the roll forming apparatus, two types of wavy portion cutting edge pairs each having a first cutting edge and a second cutting edge having different thicknesses are alternately arranged in the axial direction. At least one of the adjacent pair of cutting blades is composed of a pair of cutting blades for the wavy portion. Therefore, in the roll forming apparatus, one end face in the axial direction of the first roll and one end face in the axial direction of the second roll facing the first roll in the arrangement direction are different from each other in the coaxial direction. located in place. A step in the axial direction is generated between the end faces.

However, according to the above-described configuration in which the first collar and the second collar facing each other in the arrangement direction are different in thickness in the axial direction, the difference in thickness between the first collar and the second collar results in It is possible to absorb axial steps between the faces.

Therefore, of the first cutting edge and the second cutting edge in each pair of cutting edges for the wavy portion, the cutting edge with the smaller thickness is positioned in the central portion of the larger cutting edge in the axial direction. Positioning can be effected by both first collars and axial positioning of the second roll can be effected by both second collars.

According to the roll forming apparatus, the shear clearance can be easily formed without inserting another member or performing additional processing.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the roll forming apparatus in one Embodiment. Explanatory drawing which shows a mode that a metal sheet is shape|molded using the roll forming apparatus of one Embodiment. FIG. 2 is a partial perspective view of a porous channel plate formed by a roll forming apparatus of one embodiment; 4-4 line cross-sectional view of FIG. 5-5 line cross-sectional view of FIG. 6 is a cross-sectional view taken along line 6-6 of FIG. 3; FIG. 4 is a partial cross-sectional view of the porous flow path plate of FIG. 3; 1 is a partial cross-sectional view of a roll forming apparatus of one embodiment; FIG. FIG. 9 is a partially enlarged sectional view of FIG. 8; FIG. 10 is a partial enlarged cross-sectional view corresponding to FIG. 9 , showing a modification of the roll forming apparatus; FIG. 10 is a partial enlarged cross-sectional view corresponding to FIG. 9 , showing a modification of the roll forming apparatus;

An embodiment of the roll forming apparatus will be described below with reference to FIGS. 1 to 9. FIG. In addition, in some of the drawings, the scale of each part is appropriately changed so as to make each part of the roll forming apparatus recognizable.

As shown in FIGS. 1 and 2, a roll forming apparatus 20 of the present embodiment forms a part of a fuel cell by roll forming a long metal sheet 11 made of, for example, titanium or stainless steel plate material. It is an apparatus for forming the constituent porous flow path plate 12 .

First, a polymer electrolyte fuel cell configured using the porous channel plate 12 will be briefly described. A polymer electrolyte fuel cell includes a fuel cell stack configured by stacking a plurality of unit cells. A single cell includes a membrane electrode gas diffusion layer assembly constituting a power generation unit, a first separator and a second separator sandwiching the membrane electrode gas diffusion layer assembly from both sides in the thickness direction, and a membrane electrode gas diffusion layer assembly. and a porous flow path plate 12 provided between the second separators.

Next, the porous channel plate 12 formed using the metal sheet 11 will be described. In this embodiment, a metal sheet 11 having a thickness of 0.05 mm (50 μm) is used. Here, in describing each part of the porous channel plate 12, in order to specify the direction, the direction in which the metal sheet 11 extends is defined as the "longitudinal direction". A direction perpendicular to the width direction is referred to as a "width direction". Moreover, the direction along the plate thickness of the metal sheet 11 matches the arrangement direction of the first roll 30 and the second roll 40 in the roll forming device 20 described later.

The porous channel plate 12 has a flat portion 13 and corrugated portions 14 and 16, as shown in FIGS. These flat portion 13 and wavy portions 14 and 16 extend in the longitudinal direction while being parallel to each other in the width direction. The flat portion 13 is formed flat at a reference position in the arrangement direction, and does not have a portion protruding in the arrangement direction.

The wavy portion 14 has a plurality of protrusions 15 that protrude in one direction from the reference position in the arrangement direction. These projections 15 are located at positions spaced apart from each other in the longitudinal direction. In the wavy portion 14, the portions between the adjacent protrusions 15 are formed flat at the reference position in the same manner as the flat portion 13 described above.

The wavy portion 16 has a plurality of protrusions 17 protruding from the reference position in the arrangement direction to the other side. These projections 17 are located at positions spaced apart from each other in the longitudinal direction. Each protrusion 17 is positioned on the side of the flat portion of the wavy portion 14 . In the wavy portion 16, the portion between the adjacent protrusions 17 is formed flat at the reference position, like the flat portion 13 described above.

The wavy portion 14 and the wavy portion 16 are adjacent to each other in the width direction. The flat portion 13 is positioned opposite to the wavy portion 16 with the wavy portion 14 interposed therebetween, and is positioned opposite to the wavy portion 14 with the wavy portion 16 interposed therebetween. In other words, the flat portions 13 are positioned on both sides of the adjacent wavy portions 14 and 16 in the width direction.

The top surface of each protrusion 15 in the porous channel plate 12 is in contact with the cathode-side gas diffusion layer of the membrane electrode gas diffusion layer assembly. The bottom surface of each protrusion 17 in the porous flow path plate 12 is in contact with the second separator.

The flat portion 13, the wavy portion 14, and the wavy portion 16 are connected to each other at their adjacent portions.
In the fuel cell, oxidant gas flows between the corrugated portions 14, 16 and the membrane electrode gas diffusion layer assembly. Also, water produced by the electrochemical reaction of the reaction gas flows between the flat portion 13 and the second separator.

Next, the roll forming device 20 will be described.
As shown in FIG. 1 , the roll forming apparatus 20 includes a base 21 and a pair of support columns 22 erected on the base 21 . A first bearing 23 and a second bearing 24 are attached to each support column 22 at positions separated from each other in the vertical direction.

A first shaft portion 25 that is a rotating shaft of the first roll 30 is rotatably supported by both first bearings 23 . The second shaft portion 26, which is the rotating shaft of the second roll 40, is arranged below the first shaft portion 25 and parallel to the first shaft portion 25, and is rotatable by both the second bearings 24. Supported.

As shown in FIGS. 8 and 9, when the direction in which the first shaft portion 25 and the second shaft portion 26 extend is taken as the axial direction, the first roll 30 includes a plurality of first cutting edges 31 each having a substantially disc shape. It is constructed by laminating 32 and 33 in the axial direction. Each of the outer peripheral edges of the first cutting edges 31 to 33 is formed in an uneven shape so that the diameter changes in the circumferential direction. Adjacent ones of the first cutting edges 31 to 33 are adhered to each other. The first roll 30 is fitted over the first shaft portion 25 and attached to the first shaft portion 25 so as to be rotatable therewith.

The second roll 40 is configured by laminating a plurality of second cutting edges 41, 42, 43 each having a substantially disk shape in the axial direction. Each of the outer peripheral edges of the second cutting edges 41 to 43 is formed in an uneven shape so that the diameter changes in the circumferential direction. Adjacent ones of the second cutting edges 41 to 43 are adhered to each other. The second roll 40 is fitted over the second shaft portion 26 and attached to the second shaft portion 26 so as to be rotatable therewith. The first roll 30 and the second roll 40 are arranged to face each other in the vertical direction.

A pair of first collars 55 and 56 are fitted on the first shaft portion 25 on both sides of the first roll 30 in the axial direction. A pair of second collars 57 and 58 are fitted on the second shaft portion 26 on both sides of the second roll 40 in the axial direction.

A positioning rib 61 is provided on the first shaft portion 25 , and a positioning rib 62 is provided on the second shaft portion 26 . Both ribs 61 and 62 are positioned at the same location in the axial direction. By bringing the first collar 56 into contact with the rib 61, the first collar 56 is positioned in the axial direction. Further, the second collar 58 is brought into contact with the rib 62, thereby positioning the second collar 58 in the axial direction. The first collar 55 is attached to the first shaft portion 25 with the first roll 30 sandwiched between the first collar 55 and the first collar 56 . The second collar 57 is attached to the second shaft portion 26 with the second roll 40 sandwiched between the second collar 57 and the second collar 58 .

When the combination of the first cutting blades 31 to 33 and the second cutting blades 41 to 43 that face each other in the vertical direction, which is the arrangement direction of the first roll 30 and the second roll 40, is defined as a "cutting blade pair", the roll forming device 20 A plurality of cutting edge pairs are provided in the axial direction.

The plurality of cutting edge pairs are composed of two types of wavy portion cutting edge pairs 51 and 52 and one type of flat portion cutting edge pair 53 . The wavy portion cutting blade pair 51 is for forming the wavy portion 14 while shearing the metal sheet 11 in cooperation with the cutting blade pairs on both sides thereof. The wavy portion cutting blade pair 52 is for forming the wavy portion 16 while shearing the metal sheet 11 in cooperation with the adjacent cutting blade pairs. The two types of wavy portion cutting edge pairs 51 and 52 are adjacent to each other in the axial direction.

The pair of cutting blades 53 for flat portion is for forming the flat portion 13 while shearing the metal sheet 11 in cooperation with the pair of cutting blades on both sides thereof. The flat portion cutting edge pair 53 is arranged next to the wavy portion cutting edge pair 51 (52) on both sides of the wavy portion cutting edge pairs 51 and 52 in the axial direction. It is located next to the side where 52 (51) is not located. The adjacent two types of wavy portion cutting blade pairs 51 and 52 are sandwiched by a pair of flat portion cutting blade pairs 53 from both sides in the axial direction.

In order to properly shear the metal sheet 11, a shear clearance C1 is required between the first cutting edges 31-33 and the second cutting edges 41-43 of the adjacent cutting edge pairs.
In order to form the shear clearance C1, in the present embodiment, the first cutting edges 31, 32 and the second cutting edges 41, 42 of each of the waved portion cutting edge pairs 51, 52 are set to have dimensions in the axial direction (hereinafter (referred to as "thickness") are used.

Further, in the roll forming apparatus 20, the two types of wavy portion cutting edge pairs 51 and 52 are alternately arranged in the axial direction.
More specifically, the wavy portion forming blade pair 51 is composed of a thick first cutting blade 31 and a thin second cutting blade 42 . The wavy portion cutting blade pair 52 is composed of a second cutting blade 41 having a large thickness and a first cutting blade 32 having a small thickness.

In the flat portion cutting blade pair 53, the first cutting blade 33 and the second cutting blade 43 having the same thickness are used.
In this embodiment, among the first cutting edges 31 and 32 and the second cutting edges 41 and 42 in each of the waved portion cutting edge pairs 51 and 52, those having a thickness of 0.10 mm are used as the smaller ones. It is

Here, the shear clearance C1 between the first cutting edges 31 to 33 and the second cutting edges 41 to 43 in adjacent cutting edge pairs is generally set to about 10% of the plate thickness of the metal sheet 11. is preferred. As described above, in this embodiment, the metal sheet 11 having a thickness of 0.05 mm (50 μm) is used, so the shear clearance C1 is 0.005 mm (5 μm). Therefore, in the present embodiment, among the first cutting edges 31 and 32 and the second cutting edges 41 and 42 in each of the waved portion cutting edge pairs 51 and 52, the thickness of the thicker one is set to 0.001 mm compared to the thinner one. A large thickness of 0.1 mm, that is, a thickness of 0.11 mm is used.

Also, the first cutting edge 33 and the second cutting edge 43 in the pair of cutting edges 53 for flat portion have a thickness of 0.11 mm.
In the roll forming device 20, of the first cutting edges 31, 32 and the second cutting edges 41, 42 in the waved portion cutting edge pairs 51, 52, the thin cutting edges are arranged in the central portion in the axial direction of the large cutting edges. When positioned, the end faces on both sides of the first roll 30 in the axial direction and the end faces on both sides of the second roll 40 are shifted in the axial direction. In the case of FIG. 8, the right end surface of the first roll 30 protrudes further to the right than the right end surface of the second roll 40, creating a step between the right end surfaces. Further, the left end surface of the second roll 40 protrudes leftward from the left end surface of the first roll 30, and a step is generated between both left end surfaces.

Here, it is assumed that the first collar 56 and the second collar 58 have the same thickness in the axial direction, and the first collar 55 and the second collar 57 have the same thickness in the axial direction. , the step cannot be absorbed. Of the first cutting edges 31, 32 and the second cutting edges 41, 42 of the pair of wavy portion cutting edges 51, 52, the thin cutting edge cannot be positioned in the central portion of the large cutting edge in the axial direction.

Therefore, the first collar 56 and the second collar 58 are different in thickness in the axial direction. As the first collar 55 and the second collar 57, those having different thicknesses in the axial direction are used. In this embodiment, the first collar 56 is thinner than the second collar 58 by the amount of the step. Also, the first collar 55 is thicker than the second collar 57 by the amount of the step.

Furthermore, in the roll forming apparatus 20, as shown in FIG. 1, a gear 64 is attached to the first shaft portion 25 so as to be integrally rotatable. A gear 65 is attached to the second shaft portion 26 so as to be capable of rotating integrally therewith. A sprocket 66 is attached to the second shaft portion 26 so as to be rotatable therewith. An endless chain is stretched between the sprocket 66 and the output shaft of the electric motor (not shown).

Next, the operation of this embodiment configured as described above will be described. In addition, the effect produced by the action will also be described.
As shown in FIGS. 1 and 8, in the roll forming apparatus 20, the rib 61 and both first collars 55 and 56 position the first roll 30 in the axial direction, and the rib 62 and both second collars 57 and 58 position the first roll 30. The second roll 40 is positioned in the axial direction.

As shown in FIG. 9 , in the wavy portion cutting edge pair 51 in which the first cutting edge 31 has a greater thickness than the second cutting edge 42 , the second cutting edge 42 is the central portion of the first cutting edge 31 in the axial direction. located in The surfaces on both sides of the second cutting edge 42 in the axial direction are positioned away from the surfaces on both sides of the first cutting edge 31 by 0.005 mm.

A wavy portion cutting edge pair 52 in which the first cutting edge 32 has a smaller thickness than the second cutting edge 41 is disposed on the left side of the wavy portion cutting edge pair 51 in FIG. In this wavy portion cutting edge pair 52 , the first cutting edge 32 is positioned at the central portion of the second cutting edge 41 in the axial direction. The surfaces on both sides of the first cutting edge 32 in the axial direction are positioned away from the surfaces on both sides of the second cutting edge 41 by 0.005 mm.

The thick first cutting edge 31 of the former pair of wavy portion forming blades 51 and the thin first cutting edge 32 of the latter pair of wavy portion forming blades 52 are overlapped. In addition, the second cutting edge 42 with a smaller thickness in the former pair of cutting edges 51 for a wavy portion and the second cutting edge 41 with a larger thickness in the latter pair of wavy portion forming blades 52 are overlapped. Therefore, there is a shear of 0.005 mm between the thin first cutting edge 32 of the latter pair of wavy portion forming blades 52 and the thin second cutting edge 42 of the former wavy portion forming pair of cutting blades 51. A clearance C1 is formed.

On the right side of the former wavy portion cutting edge pair 51 in FIG. 9, a flat portion cutting edge pair 53 having the same thickness of the first cutting edge 33 and the second cutting edge 43 is arranged. . The first cutting edge 33 of the flat portion cutting edge pair 53 overlaps the thick first cutting edge 31 of the wavy portion cutting edge pair 51 . The second cutting edge 43 of the flat portion cutting edge pair 53 overlaps the thin second cutting edge 42 of the waved portion cutting edge pair 51 . Therefore, a shear clearance C1 of 0.005 mm is formed between the thin second cutting edge 42 of the wavy portion cutting edge pair 51 and the first cutting edge 33 of the adjacent flat portion cutting edge pair 53. be done.

A wavy portion cutting edge pair 52 in which the first cutting edge 32 has a smaller thickness than the second cutting edge 41 is disposed on the right side of the flat portion cutting edge pair 53 . In this wavy portion cutting edge pair 52 , the first cutting edge 32 is positioned at the central portion of the second cutting edge 41 in the axial direction.

The first cutting edge 33 of the cutting edge pair 53 for the flat portion and the thin first cutting edge 32 of the cutting edge pair 52 for the wavy portion are overlapped. Further, the second cutting edge 43 of the flat portion cutting edge pair 53 and the thick second cutting edge 41 of the waved portion cutting edge pair 52 are overlapped. Therefore, a shear clearance C1 of 0.005 mm is formed between the second cutting edge 43 of the flat portion cutting edge pair 53 and the thin first cutting edge 32 of the waved portion cutting edge pair 52. .

A flat portion cutting edge pair 53 is arranged on the left side of the wavy portion cutting edge pairs 51 and 52 adjacent to each other in the axial direction in FIG. The first cutting edge 33 of the flat portion cutting edge pair 53 overlaps with the thin first cutting edge 32 of the wavy portion cutting edge pair 52 . The second cutting edge 43 of the flat portion cutting edge pair 53 overlaps the thick second cutting edge 41 of the wavy portion cutting edge pair 52 . Therefore, a shear clearance C1 of 0.005 mm is formed between the thin first cutting edge 32 of the wavy portion cutting edge pair 52 and the second cutting edge 43 of the adjacent flat portion cutting edge pair 53. be done.

A wavy portion cutting edge pair 51 is arranged to the left of the flat portion cutting edge pair 53 in FIG. In the pair of wavy portion cutting blades 51 , the second cutting blade 42 is positioned at the central portion of the first cutting blade 31 in the axial direction.

The first cutting edge 33 of the flat portion cutting edge pair 53 and the thick first cutting edge 31 of the waved portion cutting edge pair 51 are overlapped. Further, the second cutting edge 43 of the flat portion forming blade pair 53 and the thin second cutting blade 42 of the wavy portion forming blade pair 51 are overlapped. Therefore, a shear clearance C1 of 0.005 mm is formed between the first cutting edge 33 of the flat portion cutting edge pair 53 and the thin second cutting edge 42 of the waved portion cutting edge pair 51 .

Thus, in the present embodiment, the plurality of cutting edge pairs are the wavy portion cutting edge pair 51 in which the first cutting edge 31 has a greater thickness than the second cutting edge 42 and the first cutting edge 32 is the second cutting edge 42 . and a wavy cutting edge pair 52 having a thickness smaller than that of the cutting edge 41 . The two types of wavy portion cutting edge pairs 51 and 52 are alternately arranged in the axial direction. At least one of the adjacent pair of cutting blades is constituted by the pair of cutting blades 51 and 52 for the wavy portion.

Therefore, the first cutting edge 32 and the second cutting edge 42 having a small thickness and the first cutting edges 31 and 33 and the second cutting edge 41 and 43 having a large thickness are prepared in advance, and these are arranged as described above. By laminating in order, the first roll 30 and the second roll 40 are created. Among the first cutting edges 31, 32 and the second cutting edges 41, 42 of the waved portion cutting edge pairs 51, 52, the thin cutting edge is located in the central portion in the axial direction of the large cutting edge. One roll 30 is attached to the first shank 25 by first collars 55,56 and a second roll 40 is attached to the second shank 26 by second collars 57,58. Only by performing such a simple operation, the thin cutting edge of the first cutting edge 31, 32 and the second cutting edge 41, 42 in the wavy portion cutting edge pair 51, 52 can be A shear clearance C1 can be formed between the cutting edges in the pair of cutting edges adjacent to 51,52.

As a result, unlike the conventional roll forming apparatus, the shear clearance C1 can be easily formed without inserting a separate member such as a shim or performing additional processing. can be reduced. In addition, it becomes easier to manage the shear clearance C1.

By the way, in the roll forming apparatus 20, as shown in FIGS. 1 and 2, when the output shaft of the electric motor rotates, the rotation is transmitted to the sprocket 66 via the chain. The sprocket 66 is rotated integrally with the second shaft portion 26 . As the second shaft portion 26 rotates, the gear 65 rotates in the same direction as the sprocket 66 . This rotation is transmitted to the first shaft portion 25 via the gear 64 . The first shaft portion 25 is rotated in the opposite direction to the second shaft portion 26 . The first roll 30 attached to the first shaft portion 25 is rotated in the opposite direction to the second roll 40 attached to the second shaft portion 26 .

On the other hand, the long metal sheet 11 is sent between the first roll 30 and the second roll 40 by a conveying device (not shown). The metal sheet 11 is passed between a first roll 30 and a second roll 40 which rotate in opposite directions. As shown in FIG. 9, when the metal sheet 11 passes between the first roll 30 and the second roll 40, the wavy portion forming blade pair 51, the wavy portion forming blade pair 52 on both sides thereof, and the flat blades The wavy portion 14 is formed while the metal sheet 11 is sheared by the pair of cutting blades 53 for forming the portion. The wavy portion 16 is formed while the metal sheet 11 is sheared by the wavy portion cutting blade pair 52 and the flat portion cutting blade pair 53 and the wavy portion cutting blade pair 51 on both sides thereof. The flat portion 13 is formed while the metal sheet 11 is sheared by the flat portion cutting edge pair 53 and the wavy portion cutting edge pairs 51 and 52 on both sides thereof. In this way, the intended porous flow path plate 12 having the waved portions 14, the waved portions 16 and the flat portions 13 is obtained.

According to this embodiment, the following effects are obtained in addition to the above.
- In this embodiment, as shown in FIG.1 and FIG.8, the 1st collars 55 and 56 and the 2nd collars 57 and 58 which oppose the arrangement direction have mutually different thickness.

Therefore, by positioning the first roll 30 and the second roll 40 in the axial direction by both the first collars 55 and 56 and both the second collars 57 and 58, both end surfaces of the first roll 30 and the second roll 40 are It is possible to absorb the axial step between them. Of the first cutting edges 31, 32 and the second cutting edges 41, 42 in each of the wavy portion cutting edge pairs 51, 52, the thin cutting edge can be positioned in the central portion of the large cutting edge in the axial direction. can.

It should be noted that the above-described embodiment can also be implemented as a modified example in which this is changed as follows. The above embodiments and the following modifications can be combined with each other within a technically consistent range.

On the condition that two types of wavy portion cutting edge pairs 51 and 52 are alternately arranged in the axial direction, and at least one of the adjacent cutting edge pairs is constituted by the wavy portion cutting edge pair 51 and 52, The blade pairs may be arranged in a manner different from the above embodiment. 10 and 11 show an example thereof. In addition, in FIGS. 10 and 11, the same reference numerals are given to the elements common to the above embodiment.

FIG. 10 shows a modification in which flat portion cutting blade pairs 53 are arranged on both sides of the waved portion cutting blade pair 51 and flat portion cutting blade pairs 53 are arranged on both sides of the waved portion cutting blade pair 52. showing. That is, in this modification, the flat portion cutting edge pair 53 is also arranged between the two adjacent wave portion cutting edge pairs 51 and 52 in the above-described embodiment.

FIG. 11 shows a modification in which the flat portion cutting edge pair 53 is omitted and two types of wavy portion cutting edge pairs 51 and 52 are arranged differently in the axial direction.
In any of the modifications described above, the same actions and effects as those of the above embodiment can be obtained.

- A step that occurs between the end surface of the first roll 30 and the end surface of the second roll 40 in the axial direction may be absorbed by a configuration different from that of the above embodiment.
For example, ribs 61 and 62 having different thicknesses may be used. For example, in FIG. 8, the rib 62 may be thicker than the rib 61 by the step.

As described above, the first collar 56 and the second collar 58 may be omitted when the ribs 61 and 62 absorb the step. Also, the first collar 56 and the second collar 58 may have the same thickness.

Further, of the first collar 55 and the second collar 57, the one with the smaller thickness may be omitted, and one having the same thickness as the step may be used as the one with the larger thickness. For example, in FIG. 8, the second collar 57 may be omitted, and a first collar 55 having the same thickness as the step may be used.

Alternatively, the first collar 56 and the second collar 58 may be omitted, and a thicker collar having the same thickness as the step may be used. For example, in FIG. 8, the first collar 56 may be omitted and a second collar 58 having the same thickness as the step may be used.

Even in this way, the step can be absorbed.
In any of the above cases, as in the above-described embodiment, among the first cutting edges 31 and 32 and the second cutting edges 41 and 42 in each of the waved portion cutting edge pairs 51 and 52, the thin cutting edge is replaced by the thick cutting edge. A shear clearance C1 can be formed at the axially central portion of the cutting edge.

DESCRIPTION OF SYMBOLS 11... Metal sheet, 13... Flat part, 14, 16... Wavy part, 15, 17... Projection, 20... Roll forming apparatus, 30... First roll, 31, 32, 33... First cutting edge, 40... Second 2 rolls, 41, 42, 43... second cutting blades, 51, 52... pair of cutting blades for wavy portion, 53... pair of cutting blades for flat portion, 55, 56... first collar, 57, 58... second collar.

Claims (4)

A first roll in which a plurality of first cutting edges are laminated in the axial direction and a second roll in which a plurality of second cutting edges are laminated in the axial direction are arranged in a state facing each other,
having a plurality of cutting blade pairs in the axial direction, each pair consisting of the first cutting blade and the second cutting blade facing in the arrangement direction of the first roll and the second roll;
The plurality of cutting blade pairs include two types of wavy portion cutting blade pairs for forming wavy portions having protrusions projecting in the same direction from the reference position in the arrangement direction,
The metal sheet passed between the first roll and the second roll, which are rotated in opposite directions to each other, is sheared by the pair of cutting blades for the corrugated portion and the pair of cutting blades on both sides thereof to cut the corrugated portion. A roll forming device for forming,
The thicknesses of the first cutting edge and the second cutting edge in each pair of wavy portion cutting edges in the axial direction are different from each other, and the cutting edge with the smaller thickness is positioned at the central portion of the larger cutting edge in the axial direction. The first roll and the second roll are positioned in the axial direction,
The two types of cutting edge pairs for the wavy portion are one in which the first cutting edge has a greater thickness than the second cutting edge, and the other in which the second cutting edge has a greater thickness than the first cutting edge. wherein the two types of wavy portion forming blade pairs are alternately arranged in the axial direction, and at least one of the adjacent wavy portion forming blade pairs is constituted by the wavy portion forming blade pair. Device. In the plurality of cutting blade pairs, a flat portion having no portion protruding from the reference position in the arrangement direction is formed adjacent to at least one of the wavy portion cutting blade pairs in the axial direction. Blade pairs included,
2. The roll forming apparatus according to claim 1, wherein in the pair of flat portion cutting blades, the first cutting blade and the second cutting blade have the same thickness. The two types of cutting edge pairs for the wavy portion are adjacent to each other in the axial direction,
3. The roll forming apparatus according to claim 2, wherein the pair of cutting blades for flat portions are arranged on both sides of the pair of cutting blades for both wavy portions in the axial direction. A pair of first collars are arranged on both sides of the first roll in the axial direction,
a pair of second collars disposed on both sides of the second roll in the axial direction;
The roll forming apparatus according to any one of claims 1 to 3, wherein the first collar and the second collar facing each other in the arrangement direction have different thicknesses in the axial direction.

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