WO2023025997A1 - Head for folding the edge of a metal sheet by 180° with bearing roller and associated folding method - Google Patents
Head for folding the edge of a metal sheet by 180° with bearing roller and associated folding method Download PDFInfo
- Publication number
- WO2023025997A1 WO2023025997A1 PCT/FR2022/051477 FR2022051477W WO2023025997A1 WO 2023025997 A1 WO2023025997 A1 WO 2023025997A1 FR 2022051477 W FR2022051477 W FR 2022051477W WO 2023025997 A1 WO2023025997 A1 WO 2023025997A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- edge
- folding
- support
- head
- metal sheet
- Prior art date
Links
- 239000002184 metal Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims description 7
- 238000005452 bending Methods 0.000 claims description 24
- 230000008878 coupling Effects 0.000 claims description 19
- 238000010168 coupling process Methods 0.000 claims description 19
- 238000005859 coupling reaction Methods 0.000 claims description 19
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000000151 deposition Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 238000002788 crimping Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/02—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal by folding, e.g. connecting edges of a sheet to form a cylinder
- B21D39/021—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal by folding, e.g. connecting edges of a sheet to form a cylinder for panels, e.g. vehicle doors
Definitions
- the invention relates to the field of the shaping of stampings, in particular of motor vehicle bodywork elements, more particularly by bending.
- the published patent document WO 2017/144791 A1 discloses a method of bending an edge of metal sheet against another edge of another metal sheet, with a view to crimping the edge and the other edge, by displacement of a bending head, by a robotic arm, along the edge in question.
- the folding head includes a blade with a twisted contact surface configured to bend the edge against the other edge.
- the transverse profile of the contact surface has a variation in inclination along said surface which is of the order of 180° so as to be able to bend the edge by 180° around the edge of the other edge. A single pass of the blade in question along the edge thus allows it to be folded against the other edge.
- the tilting movement of the edge around the edge of the other edge may lack precision as to the height of the 180° bend, mainly due to the differences in stiffness in different directions of the robotic arm moving the bending head.
- the published patent document EP 1 685 915 A1 discloses a bending head suitable for crimping two edges of metal sheets by folding one of said edges over the other of said edges by approximately 90°.
- the folding head comprises two rollers with different angles of inclination, so as to achieve with the first roller a first folding and with the second roller a second folding.
- the edge is thus folded against the other edge in a single pass of the folding head.
- the first wheel is mounted to slide on a support of the head, against an elastic force or controlled by a hydraulic jack, so as to be able to follow a non- straight from the edge to be folded.
- a support roller is secured to the first caster on the sliding support, so as to ensure tracking of the non-rectilinear contour.
- the aim of the invention is to overcome at least one drawback of the aforementioned state of the art. More particularly, the aim of the invention is to allow crimping of two edges of metal sheets where one edge is folded over by approximately 180° on the other edge, with better control of the height of the 180° fold thus formed.
- the subject of the invention is a head for bending an edge of a metal sheet, comprising a support; a contact surface with the edge, fixed to the support and capable of bending said edge during movement along said edge; a support roller on a die, fixed to the support; remarkable in that the contact surface extends along a twisted profile on a folding blade and is configured to fold the edge by at least 160° in a folding direction against another edge of another metal sheet; and the support roller is rotatable around an axis fixed with respect to the support.
- the bending head comprises a part for coupling to a robotic arm, the support being movable in translation relative to the coupling part against an elastic force.
- the support is movable in translation relative to the coupling part in the folding direction.
- the coupling part comprises a fixing flange extending in a transverse plane, preferably perpendicular, to the folding direction.
- the coupling part comprises a projecting part engaging in a movable manner in translation with an elongated portion of the support.
- the projecting portion forms a cylinder and the elongated portion forms a pin engaging in sliding manner in said cylinder.
- the support roller is oriented to bear against the die in the folding direction.
- the support roller is rotatable around a fixed axis relative to the support and oriented in a direction perpendicular to the folding direction or inclined by 15° or less relative to said perpendicular direction.
- the support roller is adjustable in position relative to the support in the folding direction, by means of one or more shims.
- the invention also relates to a method for bending a metal sheet edge comprising the following steps: (a) depositing the metal sheet on a die; (b) laying another sheet metal on top of the sheet metal, with another edge adjacent to the edge; (c) folding the edge against the other edge by moving a folding head along said edge; remarkable in that the bending head is according to the invention, and the movement of the bending head in step (c) includes continuous rolling of the backing roller on the die along the edge.
- step (c) the edge is bent by at least 160°.
- the metal sheet is an outer wall of a motor vehicle sunroof, and the edge is bent beforehand at 90°, within a tolerance of ⁇ 20°, and delimits the roof opening.
- the other metal sheet is a motor vehicle sunroof lining, and the other edge is bent beforehand at 90°, within a tolerance of ⁇ 20°, and delimits the roof opening.
- the measures of the invention are advantageous in that they make it possible to crimp two edges of metal sheets by folding and folding one of said edges onto the other of said edges in an efficient and controlled manner as regards the height of the edge thus folded and folded over.
- the use of a folding blade with a left and twisted contact surface is interesting in that it allows folding and folding over approximately 180° in a single pass, unlike folding rollers which, by their contact areas cylindrical annular rings, each of which only allows the edge to be bent by a limited angle, typically up to 45°.
- the fact of providing the support roller fixed with respect to the bending blade thus makes it possible to control the position of the contact surface on said bending blade with respect to the rest of the metal sheets and, consequently, to control the geometry of the edge thus folded and folded down.
- FIG 1 is a sectional view of two edges of crimped metal sheets, according to the invention.
- FIG 2 is a perspective view of an exterior wall and a motor vehicle sunroof liner, the edges of which are being crimped by moving a bending head;
- FIG 3 is a sectional view of the bending head of Figure 2.
- Figure 1 in sectional view of two edges of metal sheets crimped by folding one of said edges against the other of said edges.
- the metal sheet 2 comprises an edge 2.1 previously bent at approximately 90°, for example by "falling" during a shaping operation on a stamping press.
- the other sheet metal 4 also includes an edge 4.1 previously bent at approximately 90°, similar to edge 2.1, and placed against said edge 2.1.
- the latter is folded 180° around the edge 4.2 of the other edge 4.1 and folded against it, thus forming a 180° fold 2.2 and a folded portion 2.3.
- the edge 2.1 before folding and folding is illustrated in dotted lines, corresponding to the 180° fold and the folded portion 2.3.
- the folding and folding of the edge 2.1 can be done by relying on the edge 4.2 of the other edge 4.1 but this has the consequence that the height H of the folded edge 2.1 is determined by the height of the other edge 4.1. Or the latter may have a variable height along its extent, then leading to a non-constant height H along the edges 2.1 and 4.1 thus crimped.
- the invention provides that the edge 2.1 in question be folded around and folded against the other edge 4.1 with a clearance in the bottom of the groove formed by the 180° fold 2.2, as illustrated in FIG. Such an approach then makes it possible to overcome the tolerances of the height of the other edge 4.1.
- the edge 2.1 is folded around and folded against the other edge 4.1 by means of a folding head and a corresponding method illustrated in Figures 2 and 3.
- Figure 2 is a perspective view of an outer wall 2 and a lining 4 of a motor vehicle sunroof, the edges of which are crimped by moving a folding head.
- the outer wall corresponds to sheet metal 2 in Figure 1 and the liner corresponds to the other sheet metal 4 in Figure 1.
- the respective edges 2.1 and 4.1 visible in Figure 1 are present in Figure 2 along the opening of the sunroof, however difficult to see.
- the metal sheet 2 is placed against a die 6 specially dimensioned and shaped for this operation.
- a folding head 8 is applied against the edge to be folded and moved along said edge in order to fold it and fold it against the other edge, in order to obtain the crimp illustrated in FIG.
- the bending head 8 is supported by a robotic arm, not shown, well known in itself to those skilled in the art.
- Figure 3 is a sectional view of the folding head 8.
- the folding head 8 comprises a support 10 to which is fixed a folding blade 12 and a support roller 14.
- the folding blade 12 may be as disclosed in the published patent document WO 2017/144791 A1, that is that is to say formed essentially of a solid body having a surface in contact with the edge, said surface being left and twisted essentially in a direction generally parallel to the working direction of the blade.
- the surface in question may correspond to a surface formed by a preferentially rectilinear generatrix which moves in translation along the edge of the folding blade 12 while undergoing a rotation corresponding to the folding and folding of the edge.
- the variation in inclination of the transverse profile of the contact surface, from an entry zone to the exit zone essentially corresponds to the folding angle which must be applied to the edge.
- the bending head 8 also includes a part 16 for coupling with the robotic arm.
- the coupling part 16 comprises a flange 16.1 for fixing to the robotic arm and a cylindrical part 16.2 projecting from the fixing flange 16.1.
- THE support 10 is mounted to move in translation, against an elastic force, on the coupling part 16.
- the support 10 comprises a central part 10.1 on which the blade 12 and the support roller 14 are fixed, and an elongated part 10.2, forming a pin, slidingly engaging in the cylindrical part 16.2 of the coupling piece 16.
- the pin comprises a proximal portion with a cylindrical outer surface slidably mounted in a guide ring 16.3 mounted on the distal end of the cylindrical part 16.2 of the coupling part 16, and a distal end portion supporting a slider 10.3 slidably mounted in a bore of said cylindrical part 16.2 of the coupling part 16
- a spring 18, in this case compression, is housed in the cylindrical part 16.2 of the coupling part 16, with a first end against a bearing surface 16.4 of said cylindrical part 16.2 and a second end against a support ring 10.4 fixed to the spindle formed by the elongated part 10.2 of the support 10.
- the spindle in question forms a shoulder on which the support ring 10.4 abuts.
- the spring 18 thus exerts an elastic force on the support 10, via the support ring 10.4 and the elongated part 10.2 of said support 10.
- the folding blade 12 has its contact surface against the folded portion 2.3 of the edge 2.1 of the metal sheet 2 corresponding in this case to an outer roof skin , against the other edge 4.1 of the other metal sheet 4 corresponding in this case to a roof lining.
- the folding direction is then vertical and parallel to the other edge 4.1.
- the support roller 14 is adjacent to the folding blade 12 and is configured to bear against the die 6 in a direction corresponding to the folding direction. More specifically, the axis of rotation of the support roller 14, represented by the generally horizontal axis line, is perpendicular to the folding direction, which in this case is vertical, or at least forms with said perpendicular an angle 15° or less.
- the support roller When moving the folding head 8 along the edge 2.1 to fold and fold against the other edge 4.1, the support roller is applied against a reference surface of the die 6, adjacent to said edges 2.1 and 4.1, so as to control and control the height of the folding blade 12 and therefore of its contact surface with the edge 2.1. This contact is facilitated by the assembly sliding in translation against a force elastic of the support 10 on the coupling part 16.
- the robotic arm to which the coupling part 16 is fixed can thus, when the bending head 8 moves along the edge 2.1, exert a force on the support 10 via the spring 18, this force then being taken up by the support roller 14 rolling on the die 6.
- the sliding against an elastic force, in the bending head 8, as described above is optional in that the movement by the robotic arm can be sufficiently precise to ensure permanent contact of the support roller 14 against the matrix.
- the robotic arm also has an intrinsic elasticity which can replace or complete the mobile assembly against an elastic force described above.
- the folding blade 12 is mounted on an intermediate piece 20 having an L-shaped profile allowing the support roller 14 to be housed in the hollow of the L, directly adjacent to the folding blade 12 which is fixed to one end of the small branch of the L.
- the support roller 14 is mounted on the intermediate part 20 via a spacer 22 making it possible to ensure exact and rigid positioning.
- This shim 22 can thus be supplemented or replaced by one or more other shims.
- the matrix 6 comprises two distinct parts, namely an inner part 6.1 and an outer part 6.2 adjacent to the inner part 6.1, it being understood, however, that it can also be in one piece.
- the rolling surface 6.2.1 of the die 6 on which the bearing roller 14 rolls is directly adjacent to the lateral bearing surface 6.2.2 of the edge 2.1 and in height relative to the frontal bearing surface 6.1. 1 of the sheet metal 2.
- the rolling surface 6.2.1 is advantageously perpendicular to the lateral support surface 6.2.2 or inclined by 15° or less with respect to said perpendicular. It is however understood that the running surface 6.2.1 may be at different heights relative to the frontal support surface
- the amplitude of bending and folding of the edge of the metal sheet is of the order of 180°. However, it is understood that it can be lower, for example up to 160°. In this case the edge of the metal sheet in the unfolded state can be pre-bent at a small angle, for example up to 20°.
- the folding and folding amplitude can be greater, in which case the edge in the unfolded state can be pre-folded in the opposite direction to the folding.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202280057719.1A CN117836074A (en) | 2021-08-24 | 2022-07-22 | Folding head for folding an edge of a metal sheet by 180 DEG, with an application roller, and associated folding method |
EP22757314.4A EP4392193A1 (en) | 2021-08-24 | 2022-07-22 | Head for folding the edge of a metal sheet by 180° with bearing roller and associated folding method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR2108851A FR3126324A1 (en) | 2021-08-24 | 2021-08-24 | 180° METAL SHEET EDGE FOLDING HEAD WITH SUPPORT ROLLER |
FR2108851 | 2021-08-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023025997A1 true WO2023025997A1 (en) | 2023-03-02 |
Family
ID=77821944
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2022/051477 WO2023025997A1 (en) | 2021-08-24 | 2022-07-22 | Head for folding the edge of a metal sheet by 180° with bearing roller and associated folding method |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP4392193A1 (en) |
CN (1) | CN117836074A (en) |
FR (1) | FR3126324A1 (en) |
WO (1) | WO2023025997A1 (en) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2108851A1 (en) | 1970-10-13 | 1972-05-26 | Mediations Sciente Centre | |
JP2000005834A (en) * | 1998-06-24 | 2000-01-11 | Toyotomi Kiko Co Ltd | Successive form processing method for thin plate elasticity plastic material, flange part, and device to be used for it |
EP1685915A1 (en) | 2005-01-31 | 2006-08-02 | EDAG Engineering + Design Aktiengesellschaft | Hemming method with pre- and final hemming tool |
EP2714298A1 (en) * | 2011-05-24 | 2014-04-09 | Comau S.p.A. | Hemming head device and method |
DE102014015020A1 (en) * | 2014-10-08 | 2015-04-23 | Daimler Ag | Method and tool for processing at least one sheet metal component |
WO2017144791A1 (en) | 2016-02-22 | 2017-08-31 | Psa Automobiles S.A. | Blade and method for crimping metal sheets |
FR3097144A1 (en) * | 2019-06-14 | 2020-12-18 | Psa Automobiles Sa | Friction crimping tool |
-
2021
- 2021-08-24 FR FR2108851A patent/FR3126324A1/en active Pending
-
2022
- 2022-07-22 WO PCT/FR2022/051477 patent/WO2023025997A1/en active Application Filing
- 2022-07-22 EP EP22757314.4A patent/EP4392193A1/en active Pending
- 2022-07-22 CN CN202280057719.1A patent/CN117836074A/en active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2108851A1 (en) | 1970-10-13 | 1972-05-26 | Mediations Sciente Centre | |
JP2000005834A (en) * | 1998-06-24 | 2000-01-11 | Toyotomi Kiko Co Ltd | Successive form processing method for thin plate elasticity plastic material, flange part, and device to be used for it |
EP1685915A1 (en) | 2005-01-31 | 2006-08-02 | EDAG Engineering + Design Aktiengesellschaft | Hemming method with pre- and final hemming tool |
EP2714298A1 (en) * | 2011-05-24 | 2014-04-09 | Comau S.p.A. | Hemming head device and method |
DE102014015020A1 (en) * | 2014-10-08 | 2015-04-23 | Daimler Ag | Method and tool for processing at least one sheet metal component |
WO2017144791A1 (en) | 2016-02-22 | 2017-08-31 | Psa Automobiles S.A. | Blade and method for crimping metal sheets |
FR3097144A1 (en) * | 2019-06-14 | 2020-12-18 | Psa Automobiles Sa | Friction crimping tool |
Also Published As
Publication number | Publication date |
---|---|
EP4392193A1 (en) | 2024-07-03 |
FR3126324A1 (en) | 2023-03-03 |
CN117836074A (en) | 2024-04-05 |
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