JP2007275899A - Roll forming device and roll forming method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique of having recessed and projecting shapes formed on a work without generating wrinkles in the work. <P>SOLUTION: The work roll forming device is equipped with a pair of forming rolls. The pair of the forming rolls are provided with first forming sections for forming the first shape in the work passed between the pair of the forming rolls, the second forming sections for forming the second shape in the work passed between the pair of the forming rolls, and the third forming sections for forming the third shape in the work passed between the pair of the forming rolls. The first forming section is provided in the intermediate section in the transverse direction of the pair of the forming rolls. The second forming sections are provided respectively between one end in width direction of the pair of the forming rolls, and the first forming section, and between the other end in width direction of the pair of the forming rolls, and the first forming section. Third forming sections are provided respectively between one end in width direction of the pair of the forming rolls, and the second forming section, and between the other end in width direction of the pair of the forming rolls, and the second forming section. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to roll forming. In particular, the present invention relates to a roll forming technique in which a workpiece such as a metal plate (or metal foil) is passed between a pair of forming rolls and a predetermined shape is formed on the workpiece.

Roll forming is known in which a workpiece such as a metal plate (or metal foil) is passed between a pair of forming rolls, and a predetermined uneven shape is formed on the workpiece (for example, Patent Document 1).
In this type of roll forming, unevenness for forming a predetermined uneven shape on the work is provided on the forming roll, and the unevenness of the forming roll is pressed against the work, thereby forming the predetermined uneven shape on the work.
Japanese Patent Laid-Open No. 2004-90078

When forming a concavo-convex shape on a work by roll forming, useless wrinkles may be formed on the work after roll forming. There is a need for a roll forming technique capable of forming a concavo-convex shape on a work without causing unnecessary wrinkles on the work.
The present invention solves the above problems. The present invention provides a roll forming technique capable of forming a concavo-convex shape on a work without causing unnecessary wrinkles on the work.

  The technique of the present invention is embodied in a roll forming apparatus. This roll forming apparatus includes a pair of forming rolls. The pair of forming rolls includes a first forming portion that forms a first shape on a work that has passed between the pair of forming rolls, and a second forming that forms a second shape on the work that has passed between the pair of forming rolls. And a third forming part for forming a third shape on the workpiece that has passed between the pair of forming rolls. And the 1st shaping | molding part is provided in the width direction intermediate part of a pair of shaping | molding roll. The second forming part is provided between the one end part in the width direction of the pair of forming rolls and the first forming part, and between the other end part in the width direction of the pair of forming rolls and the first forming part. The third forming portion is provided between one end portion in the width direction of the pair of forming rolls and the second forming portion, and between the other end portion in the width direction of the pair of forming rolls and the second forming portion. .

For example, when a concavo-convex shape is formed on a work such as a metal plate (or metal foil), the work is drawn into a region where the concavo-convex shape is formed, whereby the work is shortened in the width direction or the longitudinal direction. When forming a concavo-convex shape on a workpiece by roll forming, the width and length of the workpiece are shortened at a position passing through the forming roll, so that wrinkles are generated at the position immediately before the forming roll. As a result, the work in a state in which wrinkles are generated passes between the pair of forming rolls, and unnecessary wrinkles are formed on the work after roll forming.
The roll forming apparatus according to the present invention forms the first shape at the intermediate portion in the width direction of the workpiece, simultaneously forms the second shape on both sides in the width direction of the first shape, and further forms the third shape on the outer side in the width direction of the second shape. Shape the shape. As the second shape is formed, the workpiece is pulled in the width direction toward the second shape forming positions located on both sides of the first shape forming range. At this time, since the third shape is simultaneously formed on the outer side in the width direction of the second shape, the work on the outer side in the width direction is prevented from being drawn toward the forming position of the second shape, and the work on the inner side in the width direction is suppressed. That is, the workpiece on the molding range side of the first shape is drawn preferentially. As a result, tensile stress acts on the molding range of the first shape, and wrinkles and the like are prevented from occurring in the molding range of the first shape. In the conventional method in which the third shape is not formed, since the material is drawn from the outside in the width direction when the second shape is formed, and there is little material drawn from the forming range side of the first shape, the first shape is formed. Sufficient tensile stress cannot be applied to the range, and wrinkles are likely to occur.
According to this roll forming apparatus, the first shape can be formed on the work without causing unnecessary wrinkles on the work between the second shapes located on both sides of the forming range of the first shape.

In the roll forming apparatus, when the first forming portion is provided over the first predetermined length in the circumferential direction of the pair of forming rolls, the second forming portion is arranged in the circumferential direction of the pair of forming rolls. It is preferable that the first predetermined length is provided over a second predetermined length. Furthermore, it is preferable that the 3rd shaping | molding part is provided over 3rd predetermined length beyond the said 2nd place length in the circumferential direction of a pair of shaping | molding roll.
In this roll forming apparatus, when the first shape is formed with a predetermined length along the workpiece traveling direction, the second shape is formed longer along the workpiece traveling direction than the first shape, and the third shape is formed. Is formed longer or equal in the direction of movement of the workpiece than in the second shape. Thereby, the molding of the third shape is first started on the workpiece passing through the pair of molding rolls, and then the molding of the second shape is started next or simultaneously, and then the molding of the first shape is started. Then, the molding of the first shape is finished first, then the molding of the second shape is finished, and then the shaping of the third shape is finished. Thereby, when shaping | molding a 1st shape by predetermined length along the advancing direction of a workpiece | work, it can prevent that a wrinkle arises in the workpiece | work of the shaping | molding range of a 1st shape.

In the roll forming apparatus, the second shape is preferably at least one ridge shape or valley shape extending along the traveling direction of the workpiece. Moreover, it is preferable that a 3rd shape is at least 1 peak shape or trough shape extended along the advancing direction of a workpiece | work.
When the second shape is at least one ridge shape extending along the moving direction of the workpiece (when viewed from the reverse, it becomes a valley shape), toward the second shape forming position as the second shape is formed. The work is drawn in the width direction. At this time, if the third shape is at least one ridge shape extending along the direction of movement of the workpiece (when viewed from the opposite side, it becomes a valley shape), the workpiece on the end side is drawn into the molding position of the second shape. This is further suppressed, and a tensile stress in the width direction can be applied to the molding range of the first shape. Thereby, it is possible to more reliably prevent wrinkles from occurring in the workpiece in the molding range of the first shape by further suppressing the workpiece from being shortened in the width direction along with the molding of the first shape.

In the roll forming apparatus, the third shape is preferably two or more peak shapes or valley shapes extending along the traveling direction of the workpiece.
When the third shape is two or more peak shapes or valley shapes extending along the moving direction of the workpiece, it is possible to further prevent the workpiece on the end side from being drawn into the molding position of the second shape. Thereby, it is possible to more reliably prevent wrinkles from occurring in the workpiece in the molding range of the first shape by further suppressing the workpiece from being shortened in the width direction along with the molding of the first shape.

In the roll forming apparatus, the height or depth of the third shape is preferably lower or shallower than the height or depth of the second shape.
The main purpose of the second shape is to draw the workpiece in the width direction by the molding. On the other hand, the third shape is intended to prevent the end-side workpiece from being drawn into the second shape side by the molding. Therefore, the first shape is formed by forming the height of the third shape peak shape or the depth of the valley shape lower or shallower than the height of the second shape peak shape or the depth of the valley shape. It is possible to more effectively prevent wrinkles from occurring in the work in the range.

On the other hand, in the above roll forming apparatus, when the second shape is at least one ridge shape or valley shape extending along the moving direction of the workpiece, the third shape bent the workpiece along the moving direction of the workpiece. A bent shape is also preferred.
When the workpiece on the outer side in the width direction than the second shape is bent at the time of forming the second shape, it is possible to sufficiently prevent the workpiece on the end side from being drawn toward the forming position of the second shape. Thereby, it is possible to more reliably prevent wrinkles from occurring in the workpiece in the molding range of the first shape by further suppressing the workpiece from being shortened in the width direction along with the molding of the first shape.

The technique of the present invention can also be embodied in a method for performing roll forming on a workpiece. This roll forming method includes a step of preparing a pair of forming rolls and a step of passing a workpiece between the pair of forming rolls. The pair of forming rolls used in this method includes a first forming portion that forms a first shape on the work that has passed between the pair of forming rolls, and a second shape on the work that has passed between the pair of forming rolls. A second forming part to be formed and a third forming part for forming a third shape on the workpiece that has passed between the pair of forming rolls are provided. And the 1st shaping | molding part is provided in the width direction intermediate part of a pair of shaping | molding roll. The second forming part is provided between the one end part in the width direction of the pair of forming rolls and the first forming part, and between the other end part in the width direction of the pair of forming rolls and the first forming part. The third forming portion is provided between one end portion in the width direction of the pair of forming rolls and the second forming portion, and between the other end portion in the width direction of the pair of forming rolls and the second forming portion.
According to this roll forming method, the first shape can be formed on the workpiece without causing wrinkles on the workpiece between at least the second shapes.

  According to the present invention, when forming a concavo-convex shape or the like on a workpiece by roll forming, unnecessary wrinkles can be prevented from being generated on the workpiece.

First, the main features of the embodiments described below are listed.
(Feature 1) The roll forming apparatus includes a pair of forming rolls. The pair of forming rolls includes a first forming portion that forms a first shape on a work that has passed between the pair of forming rolls, and a second forming that forms a second shape on the work that has passed between the pair of forming rolls. And a third forming part for forming the third shape on the workpiece that has passed between the pair of forming rolls. The first forming part is provided in the intermediate part in the width direction of the pair of forming rolls. The second forming part is provided between the one end part in the width direction of the pair of forming rolls and the first forming part, and between the other end part in the width direction of the pair of forming rolls and the first forming part. The third forming portion is provided between one end portion in the width direction of the pair of forming rolls and the second forming portion, and between the other end portion in the width direction of the pair of forming rolls and the second forming portion. And the 1st forming part and the 2nd forming part are separated and provided in the width direction of a pair of forming rolls. Moreover, the 2nd shaping | molding part and the 3rd shaping | molding part are spaced apart and provided in the width direction of a pair of shaping | molding roll.
(Feature 2) In the pair of forming rolls, the second forming portion is formed longer in both the front and rear directions along the rotation direction of the forming roll than the first forming portion. Moreover, the 3rd shaping | molding part is long or equal formed in the front-back both directions along the rotation direction of a shaping | molding roll rather than the 2nd shaping | molding part.
(Characteristic 3) The roll forming apparatus starts forming the second shape and the third shape prior to starting forming the first shape for the workpiece passing between the pair of forming rolls. In this case, it is preferable to start molding the third shape first and then start molding the second shape. Or you may start shaping | molding of a 3rd shape and a 2nd shape simultaneously.
(Characteristic 4) The roll forming apparatus finishes forming the second shape and the third shape after first forming the first shape for the workpiece passing between the pair of forming rolls. In this case, it is preferable to finish the second shape molding first and then finish the third shape molding. Or you may complete | finish the shaping | molding of a 2nd shape and a 3rd shape simultaneously.
(Feature 5) The roll forming apparatus includes a pair of forming rolls and a rotation drive mechanism that rotates the pair of forming rolls in the opposite direction at the same speed. The rotation drive mechanism includes a motor and the like.
(Characteristic 6) The roll forming apparatus forms an uneven shape on a long metal plate that is a workpiece.
(Characteristic 7) The roll forming apparatus forms the first shape required for the molded product into the workpiece, and simultaneously forms the second shape and the third shape that are not required for the molded product into the workpiece. The second shape and the third shape are removed from the workpiece in a subsequent process.

Example 1
FIG. 1 schematically shows the configuration of a roll forming apparatus 8 embodying the present invention. As shown in FIG. 1, the roll forming apparatus 8 includes a pair of forming rolls 10 and 20, a pair of shafts 12 and 22 that pivotally support the pair of forming rolls 10 and 20, a frame 28, and a speed reduction mechanism 32. And a motor 34 is provided. The first forming roll 10 located on the upper side is attached to the shaft 12 and is rotatably supported by the frame 28 via the bearing mechanism 14. The second forming roll 20 located on the lower side is attached to the shaft 22 and is rotatably supported by the frame 28 via the bearing mechanism 24. The rotating shaft (shaft 12) of the first forming roll 10 and the rotating shaft (shaft 22) of the lower forming roll 20 are located in the same plane. The shafts 12 and 22 of the forming rolls 10 and 20 are connected to a motor 34 via a speed reduction mechanism 32. The pair of forming rolls 10 and 20 are rotated by the motor 34 in the opposite direction at the same speed. In addition, the rotational drive mechanism for rotating the pair of forming rolls 10 and 20 in the opposite direction at the same speed is not limited to the above-described form. For example, the speed reduction mechanism 32 is not an essential configuration and may be provided as necessary. Moreover, you may drive the 1st forming roll 10 and the 2nd forming roll 20 with a respectively separate motor.
FIG. 2 shows a cross-sectional view taken along the line II-II in FIG. As shown in FIG. 2, the roll forming apparatus 8 passes a workpiece 100 between a pair of forming rolls 10 and 20 and forms a predetermined uneven shape on the workpiece 100. The roll forming apparatus 8 can repeatedly form a predetermined uneven shape on a workpiece 100 such as a long metal plate (or metal foil).

  FIG. 3 is a perspective view schematically showing the pair of forming rolls 10 and 20. As shown in FIG. 3, the surface 50 of the first forming roll 10 is provided with an uneven mold upper mold part 52, a main bead mold upper mold part 54, and an auxiliary bead mold upper mold part 56. On the other hand, the surface 70 of the second molding roll 20 is provided with a concave / convex molding lower mold part 72, a main bead molding lower mold part 74, and an auxiliary bead molding lower mold part 76. When the concave and convex molding upper mold part 52 on the first molding roll 10 side and the concave and convex molding lower mold part 72 on the second molding roll 20 side are rotated in the opposite direction at the same speed, It is provided at a position facing 100 across. Further, in the main bead molding upper mold part 54 on the first molding roll 10 side and the main bead molding lower mold part 74 on the second molding roll 20 side, the pair of molding rolls 10 and 20 are rotated in the opposite directions at the same speed. Sometimes, it is provided at a position facing each other across the workpiece 100. Further, the auxiliary bead molding upper mold part 56 on the first molding roll 10 side and the auxiliary bead molding lower mold part 76 on the second molding roll 20 side have the pair of molding rolls 10 and 20 rotated in the opposite directions at the same speed. Sometimes, it is provided at a position facing each other across the workpiece 100. In the pair of molding rolls 10 and 20, the concave / convex molding upper mold part 52 and the concave / convex molding lower mold part 72 constitute concave / convex molding parts (first molding parts) 52 and 72, and the main bead molding upper mold part 54 and the main molding part 54. The bead molding lower mold part 74 constitutes main bead molding parts (second molding parts) 54 and 74, and the auxiliary bead molding upper mold part 56 and the auxiliary bead molding lower mold part 76 constitute an auxiliary bead molding part (third molding). Part) 56, 76.

  FIG. 4 schematically shows a state in which the pair of forming rolls 10 and 20 face each other with the workpiece 100 interposed therebetween (IV portion in FIG. 3). With reference to FIG. 3, FIG. 4, the uneven | corrugated shaping | molding parts 52 and 72 are demonstrated first. The concavo-convex forming portions 52 and 72 apply plastic deformation to the workpiece 100 passing between the pair of forming rolls 10 and 20 to form a predetermined concavo-convex shape (first shape) 102 required for the molded product. The uneven forming upper mold part 52 on the first forming roll 10 side is provided over the length La in the circumferential direction of the first forming roll 10 at the intermediate portion in the width direction (axial direction) of the first forming roll 10. . Similarly, the concave-convex forming lower mold part 72 on the second forming roll 20 side is provided over the length La in the circumferential direction of the second forming roll 20 at the intermediate portion in the width direction of the second forming roll 20. Thereby, the workpiece 100 passing between the pair of molding rolls 10 and 20 is repeatedly formed with a concave and convex shape 102 required for a molded product over the length La in the longitudinal direction in the intermediate portion of the workpiece 100.

Next, with reference to FIGS. 3 and 4, the main bead forming portions 54 and 74 will be described. The main bead forming parts 54 and 74 apply plastic deformation to the workpiece 100 passing between the pair of forming rolls 10 and 20 to form the main bead 104. The first molding roll 10 is provided with two main bead molding upper mold parts 54 on both sides in the width direction of the concave / convex molding upper mold part 52. The concave / convex molding upper mold part 52 and the main bead molding upper mold part 54 are provided apart from each other in the width direction of the pair of molding rolls 10 and 20, and a first non-working part 63 is provided therebetween. . The first non-processed portion 63 is a substantially flat surface, and the workpiece 100 is not substantially processed in the first non-processed portion 63. The main bead molding upper mold part 54 is provided along the circumferential direction of the first molding roll 10 over a length L1 that is longer than the length La of the concave / convex molding upper mold part 52. More specifically, the main bead molding upper mold part 54 is formed longer in both the front and rear directions along the circumferential direction of the first molding roll 10 than the concave / convex molding upper mold part 52.
Similarly, the second molding roll 20 is provided with two main bead molding lower mold parts 74 on both sides in the width direction of the concave / convex molding lower mold part 72 via the first non-processed parts 83. Thereby, the main bead (second shape) 104 is formed on the workpiece 100 passing between the pair of forming rolls 10 and 20 in the range extending over the length L1 in the longitudinal direction on both sides in the width direction of the uneven portion 102. It is like that. At this time, the main bead 104 is molded away from the concave and convex portion 102 in the width direction of the workpiece 100. More specifically, the main bead molding lower mold part 74 is formed longer in both the front and rear directions along the circumferential direction of the second molding roll 20 than the uneven molding lower mold part 72.
The main bead molding upper mold portion 54 on the first molding roll 10 side is provided in a valley shape 54 a extending in the circumferential direction of the first molding roll 10. On the other hand, the main bead molding lower mold part 74 on the second molding roll 20 side is provided in a peak shape 74 a extending in the circumferential direction of the second molding roll 20. Thereby, the main bead forming portions 54 and 74 plastically deform the work 100 passing between the pair of forming rolls 10 and 20, and the ridge shape extending in the longitudinal direction of the work 100 is a valley shape when viewed from the reverse side. The main bead 104 is formed.

The main bead 104 formed on the workpiece 100 does not have a shape required for a molded product, but is removed from the workpiece 100 in a subsequent process. The main bead 104 is formed in order to draw the workpiece 100 in the width direction at the time of molding, and to apply a tensile stress D to the uneven portion 102 of the workpiece 100 and its periphery. As shown in FIG. 4, when the workpiece 100 is pulled toward the main bead 104, tensile stress D is applied to the uneven shape portion 102 of the workpiece 100 and the surrounding workpiece 100, and wrinkles and the like are generated in the workpiece 100. Can be suppressed.
The height (or depth) H1 of the main bead 104 is preferably set to be higher (or deeper) than the uneven size of the uneven shape 102. Moreover, it is preferable to set the height H1 of the main bead 104 between 3 times and 50 times the thickness t of the workpiece 100. Thereby, sufficient tensile stress can be applied to the workpiece 100 while preventing the workpiece 100 from breaking. The main bead 104 may be formed into a shape having a plurality of peaks (for example, a shape in which a plurality of the main beads 104 of this embodiment are arranged in parallel).

Next, with reference to FIGS. 3 and 4, the auxiliary bead forming portions 56 and 76 will be described. The auxiliary bead forming portions 56 and 76 apply plastic deformation to the workpiece 100 passing between the pair of forming rolls 10 and 20 to form the auxiliary bead 106. The first forming roll 10 is provided with two auxiliary bead forming upper mold portions 56 on the outer side in the width direction of the main bead forming upper mold portion 54 (on the end 50a side of the first forming roll surface 50). . The main bead molding upper mold part 54 and the auxiliary bead molding upper mold part 56 are provided apart from each other in the width direction of the pair of molding rolls 10 and 20, and a second non-working part 65 is provided therebetween. Yes. The second non-processed portion 65 is a substantially flat surface, and the workpiece 100 is not substantially processed in the second non-processed portion 65. The auxiliary bead molding upper mold part 56 is provided along the circumferential direction of the first molding roll 10 over a length L2 that is longer than the length L1 of the main bead molding upper mold part 54. More specifically, the auxiliary bead molding upper mold part 56 is formed longer in both the front and rear directions along the circumferential direction of the first molding roll 10 than the main bead molding upper mold part 54. The auxiliary bead molding upper mold part 56 may be provided in a range of the length L1 equal to the main bead molding upper mold part 54.
Similarly, the second forming roll 20 has two auxiliary bead forming lower mold parts 76 on the outer side in the width direction of the main bead forming lower mold part 74 (on the end 70a side of the second forming roll surface 70), respectively. The second non-processed portion 85 is provided. Thereby, the auxiliary bead (third shape) 106 is formed on the workpiece 100 passing between the pair of forming rolls 10 and 20 in the range extending over the length L2 in the longitudinal direction outside the main bead 104 in the width direction. It is like that. At this time, the auxiliary bead 106 is molded away from the main bead 104 in the width direction of the workpiece 100.
As shown in FIGS. 3 and 4, the auxiliary bead molding upper mold portion 56 on the first molding roll 10 side is provided in a valley shape 56 a extending in the circumferential direction of the first molding roll 10. On the other hand, the auxiliary bead forming lower mold portion 76 on the second forming roll 20 side is provided in a ridge shape 76 a extending in the circumferential direction of the second forming roll 20. Thereby, the auxiliary bead forming portions 56 and 76 plastically deform the workpiece 100 passing between the pair of forming rolls 10 and 20, and the ridge shape extending in the longitudinal direction of the workpiece 100 is a valley shape when viewed from the reverse side. The auxiliary bead 106 is formed.

The auxiliary bead 106 formed on the workpiece 100 does not have a shape required for a molded product, but is removed from the workpiece 100 in a subsequent process. The auxiliary bead 106 is used to prevent the workpiece 100 positioned on the outer side in the width direction from the main bead forming portions 54 and 74 from being drawn into the main bead forming portions 54 and 74 when the main bead 104 is simultaneously formed. Molded. Thereby, when the main bead 104 is molded, the workpiece 100 positioned on the concave and convex molding portions 52 and 72 side is preferentially drawn into the main bead molding portions 54 and 74, so that the concave and convex portion 102 of the workpiece 100 and the surrounding area are sufficient. A tensile stress D can be applied.
As shown in FIG. 4, the height (or depth) H <b> 2 of the auxiliary bead 106 is preferably set lower than the height H <b> 1 of the main bead 104. Note that the shape of the auxiliary bead 106 can be variously changed as long as it is a shape that can prevent the workpiece 100 from moving toward the main bead forming portions 54 and 74 during the forming thereof.

FIG. 5 shows a workpiece 100 processed by the roll forming apparatus 8. As shown in FIG. 5, the workpiece 100 after processing includes a concavo-convex shape portion 102, two main beads 104 extending on both sides of the concavo-convex shape portion 102, and the outside of the main bead 104 (on the end 100 a side of the work 100). The two auxiliary beads 106 positioned at () are repeatedly formed along the longitudinal direction. The concave and convex portion 102 and the main bead 104 are formed separately from each other in the width direction of the workpiece 100. The main bead 104 and the auxiliary bead 106 are formed so as to be separated from each other in the width direction of the workpiece 100. The uneven portion 102 is formed with a length La along the longitudinal direction of the workpiece 100. The main bead 104 is formed with a length L1 that is longer than the length La of the concavo-convex shape portion 102 along the longitudinal direction of the workpiece 100. Further, the auxiliary bead 104 is formed with a length L2 that is longer than the length L1 of the main bead 104 along the longitudinal direction of the workpiece 100. Further, as can be seen from the work 100 after roll forming, the auxiliary bead 106 is first formed along the traveling direction (longitudinal direction) of the work 100, and then the formation of the main bead 104 is started. Then, the formation of the concavo-convex shape portion 102 is started. Further, along the traveling direction (longitudinal direction) of the workpiece 100, first, the formation of the concavo-convex shape portion 102 is finished, then the formation of the main bead 104 is finished, and then the formation of the auxiliary bead 106 is finished. Yes. By forming the auxiliary bead 106 longer than the main bead 104 along the longitudinal direction of the workpiece 100, the main bead 104 indicates that the end 100 a side of the workpiece 100 is drawn toward the main bead 104 when the main bead 104 is formed. It can suppress over the whole longitudinal direction. Further, by forming the main bead 104 longer than the concavo-convex shape portion 102 along the longitudinal direction of the workpiece 100, the tensile stress is applied to the workpiece 100 over the entire longitudinal direction of the concavo-convex shape portion 102 when the concavo-convex shape portion 102 is formed. D can be added.
Thereby, wrinkles and the like can be prevented from being generated in the concavo-convex shape portion 102 and its peripheral region 120.
The workpiece 100 processed by the roll forming apparatus 8 is punched at a position indicated by a broken line 120 in FIG. 5 in a subsequent process, and a metal plate (metal foil) having the concavo-convex shape portion 102 and a flat portion 122 around it is formed. Manufactured. This metal plate can be used as a separator of a fuel cell, for example.

(Example 2)
A roll forming apparatus of Example 2 embodying the present invention will be described. The roll forming apparatus of this embodiment is obtained by changing the configuration of the auxiliary bead forming portions 56 and 76 in the roll forming apparatus 10 of the first embodiment. Hereinafter, the configuration of the auxiliary bead forming portions 56 and 76 will be mainly described, and the configuration common to the first embodiment will be sought to avoid redundant description.
FIG. 6 schematically illustrates a state in which the pair of forming rolls 10 and 20 of the present embodiment face each other with the workpiece 100 interposed therebetween, and corresponds to FIG. 4 described in the first embodiment. As shown in FIG. 6, in this embodiment, the first bead forming upper mold portion 56 on the first forming roll 10 side has a first valley shape 56 a and a second valley shape extending in the circumferential direction of the first forming roll 10. 76a is provided. On the other hand, the auxiliary bead molding lower mold portion 76 on the second molding roll 20 side is provided with a first peak shape 76 a and a second peak shape 76 b extending in the circumferential direction of the first molding roll 10. As a result, the workpiece 100 that has passed between the pair of forming rolls 10 and 20 is formed with a first auxiliary bead 108a and a second auxiliary bead 108b having a peak shape extending in the longitudinal direction (a valley shape when viewed from the opposite side). It has come to be.

FIG. 7 shows a workpiece 100 processed by the roll forming apparatus according to this embodiment. As shown in FIG. 7, the workpiece 100 after processing includes a concavo-convex shape portion 102, two main beads 104 extending in the longitudinal direction on both sides of the concavo-convex shape portion 102, and the outside of the main bead 104 (the end of the work 100 Two first auxiliary beads 108a extending in the longitudinal direction on the portion 100a side) and two second auxiliary beads 108b extending in the longitudinal direction on the outer side of the first auxiliary bead 108a (on the end portion 100a side of the workpiece 100) are formed. Has been.
In the roll forming apparatus of the present embodiment, two auxiliary beads 108a and 108b are formed outside the main bead 104 (on the end 100a side of the workpiece 100). Accordingly, when the main bead forming portions 54 and 74 draw the work 100 in the width direction to form the main bead 104, the work 100 is further prevented from being drawn from the end portion 100a side. As a result, wrinkles and the like are prevented from being generated in the concave-convex forming portion 102 of the workpiece 100 and its periphery.
As a modification of the present embodiment, for example, three or more auxiliary beads can be provided outside the main bead 104.

(Example 3)
A roll forming apparatus of Example 3 embodying the present invention will be described. The roll forming apparatus of this embodiment is obtained by changing the configuration of the auxiliary bead forming portions 56 and 76 in the roll forming apparatus 10 of the first embodiment. Hereinafter, the configuration of the auxiliary bead forming portions 56 and 76 will be mainly described, and the configuration common to the first embodiment will be sought to avoid redundant description.
FIG. 8 schematically shows a state in which the pair of forming rolls 10 and 20 according to the present embodiment face each other with the workpiece 100 interposed therebetween, and corresponds to FIG. 4 described in the first embodiment. As shown in FIG. 8, in the present embodiment, the auxiliary bead forming upper mold portion 56 on the first forming roll 10 side is provided with an enlarged diameter portion 76 c that enlarges the roll diameter. On the other hand, the auxiliary bead molding lower mold part 76 on the second molding roll 20 side is provided with a reduced diameter part 76c for reducing the roll diameter. Thus, the auxiliary bead 110 formed by bending the workpiece 100 along the both end portions 100a (that is, along the traveling direction of the workpiece 100) is formed on the workpiece 100 that has passed between the pair of molding rolls 10 and 20. It has become so.

FIG. 9 shows a workpiece 100 processed by the roll forming apparatus according to this embodiment. As shown in FIG. 9, the workpiece 100 after processing includes a concavo-convex shape portion 102, two main beads 104 extending in the longitudinal direction on both sides of the concavo-convex shape portion 102, and the outside of the main bead 104 (the end of the work 100 Two auxiliary beads 110 are formed by bending the workpiece 100a along the longitudinal direction (that is, along the traveling direction of the workpiece 100) on the portion 100a side.
In the present embodiment, when the first bead 104 is formed, the outer workpiece 100 is bent. Accordingly, when the main bead forming portions 54 and 74 draw the work 100 in the width direction to form the main bead 104, the work 100 is further prevented from being drawn from the end portion 100a side. As a result, wrinkles and the like are prevented from being generated in the concave-convex forming portion 102 of the workpiece 100 and its periphery. Sufficient tensile stress can be applied to the range in which the concave / convex shape 102 of the workpiece 100 is formed, and wrinkles and the like are prevented from being generated in the concave / convex forming portion 102 of the workpiece 100 and its periphery.

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.
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. In addition, the technology exemplified in this specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

The schematic diagram which shows the structure of a roll forming apparatus. The figure which shows a mode that a workpiece | work is processed with a pair of roll. The figure which shows the structure of a pair of roll typically. The figure which shows a mode that a pair of roll opposes on both sides of a workpiece | work. The figure which shows the workpiece | work after a process. The figure which shows the structure of the auxiliary bead shaping part of Example 2. FIG. The figure which shows the workpiece | work after a process by the roll forming apparatus of Example 2. FIG. The figure which shows the structure of the auxiliary bead shaping | molding part of Example 3. FIG. The figure which shows the workpiece | work after a process by the roll forming apparatus of Example 3. FIG.

Explanation of symbols

8: Roll forming apparatus 10, 20: Forming roll 12, 22: Shaft 14, 24: Bearing mechanism 28: Frame 32: Reduction mechanism 34: Motor 52, 72: Concavity and convexity forming part 54, 74: Main bead forming part 56, 76 : Auxiliary bead forming part 100: Work 102: Concave and convex part 104: Main beads 106, 108 a, 108 b, 110: Auxiliary beads

Claims (7)

A pair of forming rolls,
The pair of forming rolls includes a first forming portion that forms a first shape on a work that has passed between the pair of forming rolls, and a second forming that forms a second shape on the work that has passed between the pair of forming rolls. And a third forming part for forming a third shape on the workpiece that has passed between the pair of forming rolls,
The first molding part is provided in the middle part in the width direction of the pair of molding rolls,
The second molding part is provided between the one end part in the width direction of the pair of forming rolls and the first forming part, and between the other end part in the width direction of the pair of forming rolls and the first forming part,
The third forming portion is provided between the one end portion in the width direction of the pair of forming rolls and the second forming portion, and between the other end portion in the width direction of the pair of forming rolls and the second forming portion, respectively.
A roll forming apparatus. The first molding part is provided over a first predetermined length in the circumferential direction of the pair of molding rolls,
The second molding part is provided over a second predetermined length longer than the first predetermined length in the circumferential direction of the pair of molding rolls,
2. The roll forming apparatus according to claim 1, wherein the third forming portion is provided in a circumferential direction of a pair of forming rolls over a third predetermined length equal to or longer than the second place length. The second shape is at least one ridge shape or valley shape extending along the traveling direction of the workpiece,
3. The roll forming apparatus according to claim 1, wherein the third shape is at least one ridge shape or valley shape extending along a traveling direction of the workpiece.   The roll forming apparatus according to claim 3, wherein the third shape is two or more peak shapes or valley shapes extending along a traveling direction of the workpiece.   The roll forming apparatus according to claim 3 or 4, wherein the height or depth of the third shape is lower or shallower than the height or depth of the second shape. The second shape is at least one ridge shape or valley shape extending along the traveling direction of the workpiece,
3. The roll forming apparatus according to claim 1, wherein the third shape is a bent shape obtained by bending the workpiece along a moving direction of the workpiece. Preparing a pair of molding rolls;
Comprising a step of passing a workpiece between a pair of forming rolls,
The pair of forming rolls includes a first forming portion that forms a first shape on a work that has passed between the pair of forming rolls, and a second forming that forms a second shape on the work that has passed between the pair of forming rolls. And a third forming part for forming a third shape on the workpiece that has passed between the pair of forming rolls,
The first molding part is provided in the middle part in the width direction of the pair of molding rolls,
The second molding part is provided between the one end part in the width direction of the pair of forming rolls and the first forming part, and between the other end part in the width direction of the pair of forming rolls and the first forming part,
The third forming portion is provided between the one end portion in the width direction of the pair of forming rolls and the second forming portion, and between the other end portion in the width direction of the pair of forming rolls and the second forming portion, respectively.
A roll forming method characterized by the above.

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