JP4400029B2 - Long metal plate roll forming method and roll forming apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technique for forming an unevenness on a long metal plate by passing the long metal plate between a pair of forming rolls. In particular, the present invention relates to a roll forming technique for suppressing the occurrence of twisting, warping, and wrinkles on a formed long metal plate. The metal plate referred to here includes a metal plate that is thin enough to be commonly called a metal foil.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. 2001-71042 discloses a technique for roll forming unevenness having a large height difference and a small pitch. By optimizing the position and shape of the punch and die hole provided on the roll, roll formation of unevenness with a large pitch difference and fine pitch while preventing cracks and cracks in the metal plate Has succeeded.
[0003]
The roll forming technique described above is an excellent technique because it has succeeded in forming irregularities with a large pitch and a small pitch while preventing cracks and cracks from being generated in the metal plate.
[0004]
[Problems to be solved by the invention]
When producing a separator for a fuel cell, a plurality of metal plates formed with irregularities are laminated. If the metal plate on which the unevenness is formed is twisted, warped, or wrinkled, the airtightness between the gas flow paths partitioned using the unevenness is impaired when the metal plates are laminated. When a thin metal plate (or foil) having a thickness of 0.1 mm or less is roll-formed, it is extremely difficult to form irregularities while suppressing the occurrence of twisting, warping, and wrinkles.
The roll forming technique described in Japanese Patent Application Laid-Open No. 2001-71042 is a very excellent technique for forming irregularities with a large pitch and fine pitch, but when the plate thickness is thin, twisting, warping, and wrinkles are generated. There is a need for an improvement to enable molding while suppressing the above.
The present invention has been made in view of the above problems, and by twisting the long metal plate formed in the longitudinal direction by homogenizing the stress in the longitudinal direction generated in the long metal plate in the width direction, A processing method and a processing apparatus capable of suppressing the occurrence of warpage and wrinkles are provided.
[0005]
[Means and Actions for Solving the Problems]
  The present invention is a region that extends in the longitudinal direction of the intermediate portion in the width direction of the long metal plate.In a region that is later cut out from a long metal plate as a molded product, the molded product is required.UnevennessshapeThis method includes the following steps. That is, in the length range corresponding to the middle part in the width direction of the long metal plate.Molds the uneven shape required for molded productsUnevennessThe area is formedIn the length range corresponding to both ends of the long metal plate in the width directionThe ridges and valleys extending in the width direction are repeatedly formed in the rotation directionPrepare a pair of rolls. Pass a long metal plate between the pair of rolls,Long metal plateIntermediate part in the width directionRequired for molded productsUnevennessshapeMoldingAt the same time, ridges and valleys extending in the width direction are repeatedly formed in the longitudinal direction at both ends in the width direction of the long metal plate.By this, it shape | molds in the state which the stress of the longitudinal direction which arises in a elongate metal plate was homogenized in the width direction.
[0006]
  Area that extends in the longitudinal direction in the middle in the width directionThat is, the area that is later cut out from the long metal plate as a molded productIn, Required for molded productsUnevennessshapeWhen moldingthisThe length of the region in the longitudinal direction is shortened by molding. On the other hand, unevenness at both ends in the width directionshapeWhen is not molded, the length in the longitudinal direction is not shortened after molding. Corresponding to this difference, the longitudinal stress generated in the long metal plate becomes non-uniform in the width direction, and the non-uniform stress distribution in the width direction causes twisting, warping and wrinkles in the formed metal plate.
  In the molding method of the present invention, not only the intermediate portion in the width direction that requires unevenness, but also the unevenness is formed at both ends that do not require unevenness. Thereby, the stress in the longitudinal direction generated in the long metal plate is homogenized in the width direction. By uniforming the stress in the longitudinal direction in the width direction, it is possible to suppress the occurrence of twisting, warping, and wrinkling on the formed metal plate.
[0007]
  The present invention has a ridge and a valley extending in the width direction at both ends in the width direction of the long metal plate.TheRepeat in the longitudinal directionShiIt is characterized by molding.
  Extend in the width directionPeak and valleyTherepeatThen moldThis makes it possible to homogenize the stress distribution in the longitudinal direction generated at the intermediate portion in the width direction and both end portions in the width direction of the metal plate.
[0008]
  In a length range corresponding to both ends in the width direction of the long metal plate of the pair of rolls, a ridge portion and a valley portion that extend in the rotation direction and mesh with each other may be further formed. by this,At both ends in the width direction of the long metal plateExtends in the longitudinal direction in addition to the ridges and valleys extending in the width directionMinebe (Tanibe if you look at this from the back)Is further molded. in this case,ThatOf ridges or valleys extending in the longitudinal directionLongitudinal distanceIsIn the middle in the width directionRequired for molded productsUnevennessShapeMoldingBe doneThan the longitudinal distance of the region,It is effective to make it longer.
  Width directionMolded at both ends,Extends in the longitudinal directionPeak or valleyContributes to increasing the rigidity of both ends in the width direction of the metal plate.Peaks or valleys extending in the longitudinal directionThe distance in the longitudinal direction ofRequired for molded productsUnevennessShapeMoldingBe doneBy making it longer than the distance in the longitudinal direction of the region, it is possible to prevent warpage and wrinkles caused by differences in the stress distribution in the width direction.
[0009]
  Both ends of the long metal plate in the width directionThen, the peak or valley extending in the longitudinal direction is more than the peak and valley extending in the width direction.on the insideMoldedIs particularly effective.
  Peaks or valleys extending in the longitudinal directionWhenPeaks and valleys extending in the width directionTheas mentioned aboveBy combining, the stress acting in the longitudinal direction is homogenized in the width direction, and the rigidity at both ends in the width direction can be increased, thereby suppressing the metal plate from being twisted, warped or wrinkled. it can.
[0010]
  The present invention has also created an apparatus for roll forming while preventing the long metal plate from being twisted, warped or wrinkled. This roll forming apparatus includes a pair of forming rolls. The forming roll has an intermediate part in the width direction of the long metal plate.Mold the uneven shape required for molded productsUnevennessregionBesides being formed,Of the forming rollIn the length range corresponding to both ends of the long metal plate in the width directionThe ridges and valleys extending in the width direction are repeated in the rotation directionIs formed. In the middle in the width directionFormedUnevennessregionAnd both ends in the width directionPeaks and valleys formedIs set so that the longitudinal stress generated in the long metal plate is homogenized in the width direction.
[0011]
  longIn the length range corresponding to the middle part of the metal plate in the width directionMolds the uneven shape required for molded productsUnevennessRegion is formed. Also in the length range corresponding to both ends in the width directionPeaks and valleys extending in the width direction repeat in the rotation directionBy using the formed forming roll, stress equivalent to the widthwise middle part is generated at both ends in the width direction of the long metal plate, and the longitudinal stress generated in the long metal plate is homogenized in the width direction. It becomes possible to mold in the state.
[0012]
  The roll forming apparatus of the present invention islongPeaks and valleys extending in the width direction are in the length range corresponding to both ends of the metal plate in the width direction.rotationRepeat in directionShiIs formed. At this time, the valley of the other roll meshes with the peak of one roll.
[0013]
  The ridges and valleys extending in the width direction are repeated in the length range corresponding to both ends in the width direction of the long metal plate of the pair of forming rolls.ShapeThe ridge that extends in the width direction at both ends in the width direction of the long metal plate that passes between the rolls when the ridge portion of one roll meshes with the valley portion of the other roll. Part and valley repeat in the longitudinal directionShiMolded. Thereby, the stress in the longitudinal direction generated in the long metal plate is homogenized in the width direction.
[0014]
  The present invention is an apparatus for roll-forming a long metal plate, wherein a plurality of slits extending radially in a plane including the shaft axis and the shaft radial direction are formed radially from the surface of the forming roll that contacts the roll shaft. It is characterized by.
  The forming roll is composed of one forming die or a forming die obtained by assembling a plurality of divided dies, and is fixed so as to be in contact with the roll shaft. When a plurality of slits extending in a plane including the shaft axis and the shaft radius are formed radially from the surface of the forming roll in contact with the roll shaft, the adhesion between the forming roll and the roll shaft can be improved. Accuracy is improved.
[0015]
  In the roll forming apparatus of the present invention, the length range corresponding to both ends in the width direction of the long metal plate of one forming rollRotatePeaks extending in the directionBut moreFormationHas beenThe length range corresponding to both ends of the other roll in the width direction of the long metal plateRotateValley extending in the directionBut moreFormationHas beenIt is effective. Here, the valley of one roll meshes with the peak of one roll,Extend in the direction of rotationOf the peak and valleyrotationThe distance extending in the direction is the middle in the width directionFormed inConcaveConvexityRegionalrotationIt is preferably longer than the distance in the direction.
  The long metal plate that is formed by passing between the forming rolls of the present invention has a distance extending in the longitudinal direction at both ends in the width direction.Required for molded productsUnevennessShape is moldedA ridge or trough rib is formed which is longer than the longitudinal distance of the region. This rib suppresses generation of wrinkles or the like on the formed metal plate.
[0016]
  Furthermore, in the roll forming apparatus of the present invention, the length range corresponding to both ends in the width direction of the long metal plateIn ridges and valleys extending in the rotational direction, than the ridges and valleys extending in the width direction,InsideShapeIt is extremely effective to make it.
  Peaks and valleys extending in the rotational direction, and peaks and valleys extending in the width directionButas mentioned aboveThe long metal plate that passes between the formed forming rolls is controlled at both ends in the width direction with the feed speed of the long metal plate being controlled.Peaks and valleys extending in the longitudinal or width directionIs formed. Thereby, the stress in the longitudinal direction generated in the long metal plate is homogenized in the width direction, and the rigidity at both ends in the width direction can be increased. According to the present invention, it is possible to effectively suppress the occurrence of wrinkles or the like on the metal plate to be formed.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
The main features of the embodiments described below are listed below.
(Mode 1) A pair of forming rolls are arranged close to each other, and both forming rolls are rotated at the same speed by a motor to perform roll forming of a long metal plate.
(Form 2) The forming roll of form 1 is fixed to the outer periphery of the intermediate part in the axial direction of the roll shaft and is formed on the intermediate part in the width direction of the metal plate, and fixed to both axial sides of the forming mold. A pair of split molds for forming irregularities on both ends in the width direction of the metal plate and a dummy that is disposed on the opposite side of the mold with the roll shaft interposed therebetween are combined to form a substantially cylindrical shape.
(Form 3) The forming die fixed to the intermediate portion of the forming roll has an uneven region in which convex and concave portions are alternately formed in a length range corresponding to the intermediate portion in the width direction of the long metal plate to be formed. Has been. Between the pair of forming rolls, the concave and convex arrangement relationship and the amount of unevenness are opposite to each other so as to be engaged at the time of forming.
(Form 4) The split mold fixed to both ends of the forming roll has ridges and troughs that are repeated in the rotation direction on the outer side, and ridges that extend in the rotation direction. Or the trough is formed inside. Between the pair of molding rolls, the concave and convex arrangement relations are reversed so that they are engaged during molding.
(Embodiment 5) The distance in the rotational direction of the split ridges or troughs of Form 4 is longer than the length in which the ridges and troughs extending in the width direction are repeated in the rotational direction.
(Mode 6) Cut in a flat unmolded region existing between the region in which the unevenness in the intermediate portion in the width direction is formed and the region in which the unevenness at both ends in the width direction is formed. Is produced and a flat plate is left at both ends in the width direction.
[0018]
【Example】
Embodiments of the roll forming method and roll forming apparatus of the present invention will be described below in detail with reference to the accompanying drawings.
(First Example)
FIG. 1 schematically shows the configuration of a roll forming apparatus according to the first embodiment of the present invention.
In the roll forming apparatus of the present embodiment, a pair of forming rolls 1a and 1b are arranged close to each other in the vertical direction. The upper forming roll 1a includes a forming die 4a fixed to the outer periphery of the intermediate portion in the axial direction of the upper roll shaft 2a, split dies 6a and 6c fixed to both ends in the axial direction of the forming die 4a, and a roll shaft. A dummy 8a that does not participate in molding fixed to the opposite side of the molding die 4a across the diameter 2a is combined. The lower molding roll 1b includes a molding die 4b fixed to the outer periphery of the axially intermediate portion of the lower roll shaft 2b, split molds 6b and 6d fixed to both axial ends of the molding die 4b, A dummy 8b that does not participate in molding fixed to the opposite side of the molding die 4b across the diameter of the roll shaft 2b is combined. Both end portions of the roll shafts 2 a and 2 b are rotatably held by a bearing holder 14 with respect to a frame 16 that supports the entire apparatus. A reduction gear 12 is connected to the roll shafts 2 a and 2 b, and a motor 11 is connected via the reduction gear 12. The forming rolls 1a and 1b are rotated in the opposite direction at the same speed by the motor 11.
[0019]
FIG. 2 schematically shows a pair of forming rolls 1a and 1b arranged close to each other in the vertical direction.
A molding die 4a is fixed to the central portion in the axial direction of the upper roll shaft 2a. In the forming die 4a, a concave portion 23a and a convex portion 25a having substantially the same shape as the concave-convex shape required for the molded product are provided in the width direction within a width range corresponding to the intermediate portion in the width direction of the long metal plate to be formed. The uneven regions 24a are formed alternately. In order to illustrate the relationship between the concave and convex portions, a curve that curves over the concave portion 23a and the convex portion 25a is added. Split molds 6a and 6c are fixed to both sides of the mold 4a in the axial direction. On the outer side of the split molds 6a and 6c, concave and convex portions 20a and 20c are formed in which the ridges and valleys extending in the width direction are repeated in the rotation direction, and the valley portions 22a extending in the rotation direction on the inner side. , 22c. The length in the rotation direction of the uneven portions 20a and 20c is substantially equal to the length in the rotation direction of the uneven region 24a, but the length in the rotation direction of the valley portions 22a and 22c is larger than the length in the rotation direction of the uneven region 24a. long.
A molding die 4b is fixed to the central portion in the axial direction of the lower roll shaft 2b. The molding die 4b has a concave portion 23b and a convex portion 25b having substantially the same shape as the concave and convex shapes required for the molded product in the width direction corresponding to the widthwise intermediate portion of the long metal plate to be molded. The uneven regions 24b alternately formed are formed. In order to illustrate the relationship between the concave and convex portions, a curve that curves over the concave portion 23b and the convex portion 25b is added. In the mold 4a, the arrangement relationship between the concave and convex portions in the width direction and the concave and convex amount are opposite, the positions in the width direction of the concave portions 23a and the convex portions 25b match, and the width direction positions of the convex portions 25a and the concave portions 23b are one. Then, the concave portion 23a and the convex portion 25b mesh with each other, and the convex portion 25a and the concave portion 23b mesh with each other. Split molds 6b and 6d are fixed to both sides of the mold 4b in the axial direction. On the outer side of the split molds 6b and 6d, there are formed concavo-convex parts 20b and 20d where ridges and valleys extending in the width direction are repeated in the rotation direction, and ridges 22b extending in the rotation direction on the inner side. , 22d are formed. The uneven portion 20a and the uneven portion 20b mesh with each other. That is, the other peak corresponds to one valley, and the other valley corresponds to one peak. Similarly, the uneven portion 20c and the uneven portion 20d are engaged with each other. The width direction positions of the valley portion 22a and the peak portion 22b coincide, the width direction positions of the valley portion 22c and the peak portion 22d match, the valley portion 22a and the peak portion 22b mesh, and the valley portion 22c and the peak portion 22d mesh. Fit. The length in the rotation direction of the uneven portions 20b and 20d is substantially equal to the length in the rotation direction of the uneven region 24b, but the length in the rotation direction of the peak portions 22b and 22d is larger than the length in the rotation direction of the uneven region 24b. long.
[0020]
A dummy 8a is combined and fixed to the roll shaft 2a on the opposite side across the diameter of the roll shaft 2a from the mold 4a and the split dies 6a and 6c. A key 10 is positioned between the dummy 8a, the mold 4a, and the split molds 6a and 6c for positioning and fixing the mold 4a and the split molds 6a and 6c in the circumferential direction.
A dummy 8b is combined and fixed to the roll shaft 2b on the opposite side of the mold 4b and the split dies 6b and 6d across the diameter of the roll shaft 2b. A key 10 for positioning and fixing the molding die 4b and the split dies 6b and 6d in the circumferential direction is fixed between the dummy 8b, the molding die 4b, and the split dies 6b and 6d.
The roll radius on the side where the mold 4a and the split dies 6a and 6c are fixed is larger than the roll radius on the side where the dummy 8a is fixed. The roll radius on the side where the mold 4b and the split dies 6b and 6d are fixed is larger than the roll radius on the side where the dummy 8b is fixed.
The shapes of the forming rolls 1a and 1b configured by combining and fixing the forming die, the split die and the dummy to the roll shafts 2a and 2b are substantially cylindrical.
[0021]
FIG. 3 shows a cross section taken along line III-III in FIG. 1 of the pair of forming rolls 1a and 1b, and FIG. 4 shows a cross section of the lower forming roll 1b along the roll shaft axis.
Slits 18 are formed radially from the surfaces of the molds 4a and 4b in contact with the roll shafts 2a and 2b. Each slit 18 extends in a plane including the shaft axis and the shaft radius. The roll shafts 2a and 2b are provided with a key 26 serving as a positioning reference in the circumferential direction of the molding dies 4a and 4b, and the circumferential positioning of the molding dies 4a and 4b with respect to the roll shafts 2a and 2b can be easily and accurately performed. It can be carried out.
[0022]
As shown in FIG. 4, the split dies 6b and 6d (6a and 6c) are overlapped and fixed on the molding die 4b (4a). A solid line 19 in FIG. 3 indicates a surface where the molding dies 4a and 4b are in contact with the split dies 6a, 6c, 6b and 6d.
The molds 4a, 4b and the roll shafts 2a, 2b are provided with a plurality of bolt holes directed toward the center of the shaft axis in the portions finally filled with the divided dies 6a, 6c, 6b, 6d, The molds 4a and 4b are fixed to the roll shafts 2a and 2b by a plurality of bolts 17. The bolts 17 are provided at appropriate intervals between the blocks divided by the slits 18. Since the slits 18 are formed radially, when the molding dies 4a and 4b are fixed to the roll shafts 2a and 2b with a plurality of bolts 17, the inner surfaces of the molding dies 4a and 4b are in close contact with the outer surfaces of the roll shafts 2a and 2b. The molds 4a and 4b can be fixed to the roll shafts 2a and 2b with high positional accuracy.
[0023]
The concavo-convex portions 20a to 20d formed in the split dies 6a, 6c, 6b, and 6d and having ridges and valleys extending in the width direction are repeated in the rotation direction are long metal plates when the forming rolls 1a and 1b are rotated. The feed speed of the long metal plate is appropriately controlled. Moreover, the uneven | corrugated shape by which the peak part and trough part extended in the width direction are repeated in the longitudinal direction can be shape | molded at the both ends of the long metal plate which passes.
The height difference between the ridges and valleys of the concavo-convex portions 20a to 20d is higher than the height difference between the concavo-convex portions of 23a, 23b, 25a, and 25b corresponding to the concavo-convexities of the molded product, and the repetitive pitch between the ridges and valleys is It is preferably 10 times or more the plate thickness of the long metal plate.
[0024]
An example of the long metal plate 27 formed by the roll forming apparatus of this embodiment is shown in FIG. In the region extending in the longitudinal direction of the intermediate portion in the width direction, convex portions 32 and concave portions 30 formed by being sandwiched between the molds 4a and 4b are alternately formed in the width direction. The surface shapes of the convex portions 32 and the concave portions 30 are substantially equal to the surface shapes of the concave portions 23a and the convex portions 25b and the convex portions 25a and the concave portions 23b. At both ends in the width direction of the long metal plate 27, a corrugated shape 36 formed by being sandwiched between the concavo-convex portions 20a to 20d and having ridges and valleys extending in the width direction repeated in the longitudinal direction is formed. Has been. Since the waveform shape 36 does not look like a waveform when seen in a plan view, FIG. The waveform shape is symmetrical. Between the region where the convex portion 32 and the concave portion 30 are repeated in the width direction, and the corrugated shape 36, a rib 34 having a peak portion (a trough portion when viewed from the back) is formed in the longitudinal direction. Between the region where the convex portion 32 and the concave portion 30 are repeated in the width direction and the rib 34 extending in the longitudinal direction, a region 26 that is not molded and maintains a flat surface is secured.
[0025]
Along with the rotation of the forming rolls 1a and 1b, the long metal plate 27 is formed between the forming dies 4a and 4b and between the divided dies 6a and 6c and 6b and 6d while the longitudinal distance is compressed. The Since the concave and convex shapes are simultaneously formed in the intermediate portion and both end portions in the width direction, the degree of compression in the longitudinal direction is made uniform in the width direction of the long metal plate 27. That is, the stress in the longitudinal direction generated in the long metal plate is homogenized in the width direction. In addition, since the rib 34 is longer than the length of the concave and convex portions 30 and 32 in the longitudinal direction, the stress in the longitudinal direction is homogenized in the longitudinal direction in the concave and convex portions 30 and 32 and the surrounding flat region 26. Yes. No wrinkles occur in the flat region 26.
While the long metal plate 27 is sandwiched between the dummy 8a and 8b, the dummy 8a and 8b are idled because the distance between the dummy 8a and 8b is wide, and the long metal plate 27 is not sent. As shown in FIG. 5, in the long metal plate 27, the concave portion 30 and the convex portion 32 are intermittently formed in the longitudinal direction in the concave / convex forming region extending in the longitudinal direction at the intermediate portion in the width direction. In the region where the concave portion 30 and the convex portion 32 are discontinuous in the longitudinal direction, the flat surface is maintained without forming the concave and convex portions.
[0026]
The roll-shaped long metal plate 27 has a shorter distance in the longitudinal direction. The degree of shortening is almost uniform in the width direction. In order to form while shortening the distance in the longitudinal direction, the metal plate 27 is not easily cracked or cracked, the degree of freedom of the forming shape is very high, and the unevenness with fine pitch can be formed with a large height difference. . Further, the stress state generated at both ends in the width direction by the uneven shape 36 and the rib 34 and the stress state generated at the intermediate portion in the width direction are homogenized, and no wrinkles occur in the peripheral region 26 of the uneven forming region. Further, since the rigidity of the peripheral portion is increased by the ribs 34, the entire long metal plate 27 is not twisted or warped.
[0027]
The formed long metal plate 27 is cut along the dotted line 25, and the uneven forming region and the surrounding flat region are cut out and used. FIG. 6 shows a fuel cell separator formed by laminating a plurality of cut metal plates 28. While a plurality of flat electrodes 54a and 54b sandwiching the polymer electrolyte membrane 52 are laminated, two metal plates 28 with irregularities are disposed so that the concave portions 42 are in contact with the convex portions 44, and hydrogen The gas channel 48, the oxygen gas channel 50, and the cooling water channel 46 are partitioned. At this time, the metal plate 28 formed by the roll forming method and the roll forming apparatus according to the present invention is free from twisting, warping, and wrinkling, and therefore has high gas sealing performance.
[0028]
Second Embodiment FIG. 7 schematically shows the configuration of a roll forming apparatus according to the second embodiment of the present invention. FIG. 8 shows a cross section of the pair of forming rolls 1a and 1b orthogonal to the roll shaft axis, and FIG. 9 shows a cross section of the upper forming roll 1a along the axis of the roll shaft. About the same thing as 1st Example, the same code | symbol is provided and duplication description is omitted.
The lower forming roll 1b of the present embodiment includes a forming die 4b fixed to the axial intermediate portion of the roll shaft 2b and two pairs of split dies 7b, 7d fixed to both axial end portions of the forming die 4b. 9b, 9d and a dummy 8b that does not perform molding are combined into a substantially cylindrical shape. The upper molding roll 1a includes a molding die 4a fixed to an axial intermediate portion of the roll shaft 2a, and two pairs of split dies 7a, 7c, 9a, 9c fixed to both axial end portions of the molding die 4a. It has a substantially cylindrical shape combined with a dummy 8a that is not formed.
[0029]
As shown in FIG. 9, the molding die 4 b fixed to the intermediate portion in the axial direction of the lower roll shaft 2 b has recesses 23 b and projections 25 b having a shape substantially corresponding to the uneven shape to be molded alternately in the width direction. Arranged uneven regions 24b are formed. The split dies 7b and 7d fixed on both sides in the axial direction of the mold 4b are formed with ridges 22b and 22d extending in the rotational direction. The split molds 9b and 9d arranged on the outside are provided with concave and convex portions 20b and 20d in which ridges and valleys extending in the width direction are repeated in the rotation direction. The split dies 7b, 7d, 9b, 9d at both ends in the axial direction are overlapped with the forming die 4b and fixed to the roll shaft 2b.
The upper mold 4a is provided with an uneven area in which the arrangement relationship between the mold 4a, the concave and convex portions in the width direction, and the amount of unevenness are reversed. The upper split dies 7a, 7c, 9a, 9c correspond to the shape of the split dies that form a pair on the lower side, and are formed with a concavo-convex shape in which the convex portion and the concave portion can be reversed and meshed.
[0030]
An example of the long metal plate 27 formed by the roll forming apparatus of this embodiment is shown in FIG. Concave and convex shapes formed in the intermediate portion in the width direction have concave portions 30b branched in the middle to form concave portions 30a with a fine pitch. Correspondingly, the convex portion 32a is divided into twice the number of the convex portions 32b, and the width is narrowed. For this reason, the value of the residual stress after molding differs between the region where the uneven shapes 30b, 32b are formed and the region where the uneven shapes 30a, 32a are formed.
[0031]
In the present embodiment, two types of irregularities are formed at both ends corresponding to the change in the residual stress at the intermediate portion of the long metal plate 27. The pitch of the concavo-convex shape 36 in which the ridges and valleys formed by the split dies 9a to 9d are repeated is fine in the portion corresponding to the concavo-convex 30a and 32a, and is coarse in the portion corresponding to the concavo-convex 30b and 32b. The amount of compression in the longitudinal direction of the long metal plate 27 is increased by the uneven shape 36a having a fine pitch. Further, as shown in FIG. 8, the height H of the uneven shape 22 formed in the split molds 7a to 7d is higher in the portion corresponding to the uneven portions 30a and 32a than the height H2 in the portion corresponding to the uneven portions 30b and 32b. The height H1 is increased to increase the rigidity, and the stress distribution is homogenized in the width direction.
Even when the residual stress value of the long metal plate 27 changes in the middle of forming, by homogenizing the stress state in the width direction, the occurrence of twisting and warping is suppressed, and the occurrence of wrinkles on the flat portion is suppressed. can do.
[0032]
The forming roll 1a of the present embodiment is divided into four (7a, 7c, 9a, 9c) divided molds fixed to both axial ends in addition to the forming mold 4a fixed to the axially intermediate portion, The pair of split dies 7a and 7c is formed with an uneven portion 22 for forming a rib 34 extending in the rotation direction, and the other pair of split dies 9a and 9c has a ridge and a valley extending in the width direction repeated in the rotation direction. An uneven portion 20 is formed. As a result, it is possible to adjust only one of the height difference of the ribs 34 and the pitch or height difference of the repetitive peaks 36 and valleys 36, which can cope with various stress states of the long metal plate 27. it can. Thereby, it is possible to easily prevent the long metal plate 27 from being twisted, warped or wrinkled.
[0033]
Third Example In this example, the uneven shape shown in FIG. 11 is formed on the long metal plate 27. A wide convex portion 38 is provided at the center of the long metal plate 27, and the concave portion 40 is intermittently left in the longitudinal direction at the top portion. Concave portions 30 and convex portions 32 are alternately formed on both sides of the convex portion 38.
The roll forming apparatus and the roll forming method of this example are also substantially the same as those of the first example, and the uneven shapes of the surfaces of the forming dies 4a and 4b are different. Conventionally, when a shape having a wide convex portion 38 or concave portion 40 at the center is formed, the stress state between the intermediate concave and convex portions 30 and 32 is difficult to be homogenized, and it is more difficult to eliminate warping and twisting. It was. In this embodiment, the concavo-convex portions 20a to 20d, in which the ridges and valleys extending in the width direction are repeated in the rotation direction, hold the long metal plate 27 while the forming roll rotates, and the long metal plate 27 is retained. Can be molded while compressing in the longitudinal direction. In addition, the ribs 34 formed at both ends of the long metal plate and the uneven shape 36 in which the ridges and valleys extending in the width direction are formed, the longitudinal direction generated in the long metal plate 27 is formed. It became possible to homogenize the stress in the width direction. For this reason, the long metal plate 27 of the present embodiment can be prevented from warping, twisting and wrinkles in the peripheral portion even after molding.
[0034]
Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. For example, in the embodiment, a pair of forming rolls are arranged up and down, but it is also possible to arrange them up and down with left and right or a fixed angle. In the embodiment, one metal plate is formed by one rotation of the roll using a dummy. However, if a forming die is used instead of the dummy, two metal plates can be formed by one rotation of the roll. . It is also possible to increase the length of one forming roll and repeatedly fix two forming dies in the length direction. In this case, a pair of left and right long metal plates are formed simultaneously. Can be processed. The configuration of the roll forming apparatus can be freely added or changed as long as the characteristics of the molded product do not change.
The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing.
[0035]
【The invention's effect】
As described above, according to the roll forming method and roll forming apparatus for a long metal plate of the present invention, when forming irregularities on a thin metal plate with a plate thickness of 0.1 mm or less, the longitudinal direction applied to the long metal plate Can be homogenized in the width direction. This makes it possible to perform roll forming while suppressing the long metal plate having a small thickness from being twisted, warped or wrinkled.
When manufacturing a separator for a fuel cell using a metal plate having irregularities formed by the roll forming method and roll forming apparatus of the present invention, the stacking operation is easy, and the gas formed using the irregularities when laminated A separator with high airtightness between the flow paths can be manufactured.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing the configuration of a roll forming apparatus according to a first embodiment of the present invention.
FIG. 2 is a diagram schematically showing the configuration of a pair of forming rolls according to the first embodiment of the present invention.
FIG. 3 is a cross-sectional view of a pair of forming rolls according to the first embodiment of the present invention.
FIG. 4 is a longitudinal sectional view of an upper forming roll according to the first embodiment of the present invention.
FIG. 5 is a view showing the shape of a long metal plate formed in the first embodiment of the present invention.
FIG. 6 is a view schematically showing a cross section of a separator of a fuel cell manufactured by laminating metal plates formed in the first embodiment of the present invention.
FIG. 7 is a diagram schematically showing a configuration of a roll forming apparatus according to a second embodiment of the present invention.
FIG. 8 is a cross-sectional view of a pair of forming rolls according to a second embodiment of the present invention.
FIG. 9 is a longitudinal sectional view of an upper forming roll according to a second embodiment of the present invention.
FIG. 10 is a view showing the shape of a long metal plate formed in the second embodiment of the present invention.
FIG. 11 is a view showing the shape of a long metal plate formed in the third embodiment of the present invention.
[Explanation of symbols]
4a, 4b: Mold
6a, 6b, 6c, 6d: division type
23a, 23b: recess
25a, 25b: convex portion
22a, 22c: Valley
22b, 22d: Peak
20a, 20b, 20c, 20d: irregularities

Claims (7)

It is a region that extends in the longitudinal direction in the widthwise intermediate portion of the long metal plate , and is a method of forming a concavo-convex shape required for the molded product in a region that is later cut out from the long metal plate as a molded product ,
In the length range corresponding to the intermediate portion in the width direction of the long metal plate, an uneven region for forming the uneven shape required for the molded product is formed, and the length corresponding to both end portions in the width direction of the long metal plate In the range, a step of preparing a pair of rolls in which ridges and valleys extending in the width direction are repeatedly formed in the rotation direction ;
The long metal plate is passed between the pair of rolls, and the uneven shape required for the molded product is formed at the intermediate portion in the width direction of the long metal plate, and at the width direction both ends of the long metal plate in the width direction. A step of repeatedly forming the extending peak and valley in the longitudinal direction ;
Roll forming method of Bei El long metal plate. In the length range corresponding to the width direction both ends of the long metal plate of the pair of rolls, ridges and valleys that extend in the rotational direction and mesh with each other are further formed,
In addition to the ridges and valleys extending in the width direction at both ends in the width direction of the long metal plate, ridges or valleys extending in the longitudinal direction are further formed ,
Claim that the longitudinal distance of the ridges or valleys extending in the longitudinal direction, the concave-convex shape required of the molded article in the width direction intermediate portion than the longitudinal length of the region to be molded, characterized by long The roll forming method according to 1. In the both widthwise end portions of the elongate metal plate, said ridge extending in the longitudinal direction or troughs is, the than the ridge valleys extending in the width direction, to claim 2, characterized in that it is formed on the inside The roll forming method as described. An apparatus for roll-forming an uneven shape required for a molded product in a region extending in the longitudinal direction at an intermediate portion in the width direction of the long metal plate and later cut out from the long metal plate as a molded product, The forming roll of
In the length range corresponding to the width direction intermediate portion of the long metal plate of the forming roll, an uneven region for forming the uneven shape required for the molded product is formed ,
The length range corresponding to both widthwise end portions of the elongate metal plate of the forming roll, ridge and valley portions extending in the width direction is formed repeatedly in the direction of rotation, the ridges of one roll roll forming apparatus of a long metal plate valleys of the other roll, characterized the TURMERIC mesh. 5. The roll forming apparatus according to claim 4, wherein a plurality of slits extending radially in a plane including a shaft axis and a shaft radius are formed radially from the surfaces of the pair of forming rolls in contact with the roll shaft. The length range corresponding to both widthwise end portions of the elongate metal plate of the forming roll is formed meshes ridge and valley portions are further from each other along with extending in the rotational direction,
Distance extending in the rotational direction of the ridge valleys extending in the direction of rotation, according to claim 4 or 5 than the distance in the rotational direction of the concave convex area formed in the width direction intermediate portion, and wherein the longer The roll forming method as described in 2. Wherein the length range corresponding to both widthwise end portions of the elongate metal plate forming rolls, ridges and valleys extending in the rotation direction, than the ridge and valley extending in the width direction, the shape formed on the inside The roll forming apparatus according to claim 6, wherein the roll forming apparatus is provided.

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