US3838590A - Method and apparatus for forming undercut corrugations in sheet metal - Google Patents

Method and apparatus for forming undercut corrugations in sheet metal Download PDF

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Publication number
US3838590A
US3838590A US00340874A US34087473A US3838590A US 3838590 A US3838590 A US 3838590A US 00340874 A US00340874 A US 00340874A US 34087473 A US34087473 A US 34087473A US 3838590 A US3838590 A US 3838590A
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United States
Prior art keywords
sheet
undercut
corrugation
die
clamps
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US00340874A
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English (en)
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Dijk E Van
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    • 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
    • B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
    • B21D13/02—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by pressing
    • 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
    • B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
    • B21D13/10—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form into a peculiar profiling shape

Definitions

  • ABSTRACT A metal sheet or band is clamped betweed'spaced pairs of clamps, movable toward and away from each other, at points spaced apart a distance equal to the width of the sheet required to define an undercut corrugation to be formed.
  • a second die may be provided to move in opposition to the first die to press the metal sheet against the top of the head of the first die.
  • the pairs of closed clamps are retracted relative to each other to provide clearance for retraction of the die head through the narrow undercut portion of the formed corrugation.
  • the clamps may then be released, or they may be brought toward each other until they are spaced apart a distance equal to the thickness of the narrow part of the undercut corrugation. Stops may be provided to limit the movement of the clamps relative to each other.
  • the invention is directed to the manufacturing or forming of undercut corrugations in a metal sheet or band and, more particularly, to a novel and improved method of and apparatus for effecting such formation.
  • a known apparatus for forming undercut corrugations in a metal sheet or band two pairs of clamps are arranged in a frame to be movable horizontally relative to each other while clamping therebetween a piece of sheet metal.
  • a forming die positioned between the pairs of clamps and beneath the sheet material, is moved upwardly, with the motions of the clamps and of the forming die being coordinated in such a way that the sheet is folded against the forming die without shifting relative to the die.
  • Such an apparatus is disclosed, for example, in Netherlands Pat. No. 132,181.
  • the forming die is then retracted to its original position while the clamps remain stationary, after which the clamps, with the corrugation between them, are moved further toward each other.
  • the forming part of the forming die is made in such a way that, by folding of the sheet material against the forming die, an undercut corrugation is formed.
  • the undercut corrugation may be released by loosening the clamps, moving them outward a slight distance from their middle position, and then retracting the forming die forcibly, whereby the deformation of the formed corrugation, caused by the passing of the widest part of the forming die through the narrowest part of the corrugation, is compensated by springback of the force of the opened corrugation.
  • the forming die may also be withdrawn from the corrugation by maintaining the clamps closed and moving them sufficiently far apart that the forming die may be pulled back freely through the resultant opened corrugation.
  • the undercut corrugation, already shaped, is thereby partly unfolded. From experiments, however, it has been determined that the deformation by the original formation has been such, in many cases, that in moving the clamps together again, while clamping the sheet, the original corrugation is restored.
  • a suitable counterdie beam as known from the art, may be used.
  • An object of the invention is to provide a novel method of forming a series of undercut corrugations in sheet metal.
  • Another object of the invention is to provide an improved apparatus for forming a series of undercut corrugations in sheet metal.
  • a further object of the invention is to provide such a method and apparatus operable to form identical corrugations in sheet metal and independent of whether or not the material is completely homogeneous either in thickness or in mechanical properties.
  • the invention accordingly comprises the several steps and the relation of one or more of such steps with respect to each of the others, and the apparatus embodying features of construction, combinations of elements and arrangement of parts which are adapted to effect such steps, all as exemplified in the following detailed disclosure, and the scope of the invention will be indicated in the claims.
  • FIG. 1 is a somewhat schematic perspective view of apparatus embodying the invention.
  • FIGS. 2 through 10 are somewhat schematic vertical sectional views along the line 2-2 of FIG. 1 and illustrating the different phases of a working cycle.
  • the metal sheet to be corrugated is indicated at 15, with the corrugation to be formed being indicated, as in FIG. 10, at 30.
  • The'apparatus includes clamps l2, l2 and 13, 13 which are arranged to be moved substantially horizontally toward and away from each other. Motions of clamps 12 and 13 away from each other, or away from the center of the apparatus, are limited by adjustable stops l6 and 16', it being noted that the stops 16' are substantially longer than the stops 16. Stops 18 limit movement of clamps l2 and 13 toward each other, and are adapted to the ultimately required corrugation.
  • Stops 18 may be omitted if the required corrugation requires that, in the last folding operation, as shown in FIGS. 6 and 7, the clamps l2 and 13 are moved as close to each other as possible. Adjustable stops 17 are provided and, in the phase of the apparatus shown in FIGS. 1 and 2, are positioned directly beneath clamps 12 and 13.
  • the undercut corrugation is arranged to be formed by a lower die, generally indicated at 20, including, in the illustrated example, a circular cross-section head 21 and a narrow neck 22, neck 22 being received in a groove 24 in a die support 23, so that lower die 20 is interchangeable when different shaped undercut corrugations are to be formed.
  • An upper die 25 is provided, in the particular example shown in the drawings, to cooperate with lower die 20, and includes a die part 26, having a concave lower edge, inserted into a groove 28 in a die support 27, so that die part 26 is also interchangeable with other die parts.
  • Such interchangeability allows the use of various shapes of dies in the respective die holders 23 and 27 in accordance with the particular shape of the undercut corrugation to be formed in metal sheet 15.
  • stops 17, 17 initially positioned under clamps 12 and 13 move upwardly to limit the retraction motion of clamps l2 and 13, the parts now occupying the position shown in FIG. 4. Clamps l2 and 13 are then retracted until they engage the stops 17, as shown in FIG. 5. Due to this retraction of the closed clamps 12 and 13, the sheet material hitherto folded around forming die 20 is partially unfolded, also as shown in FIG. 5. The adjustment of stops 17 must be such that, when clamps 12 and 13 engage these stops, the head 21 of forming die 20 can be retracted vertically through the resultant opening in the undercut corrugation 30.
  • the shaped corrugation must now be freed.
  • the upper clamps 12 and 13, of the respective pairs of clamps are displaced a slight distance upwardly, carrying with them the counterdie 25. Stops 17, at the same time, are returned to their retracted position. It is also possible to lower the lower clamps 12 and 13, of the respective clamp pairs, a small amount.
  • clamps 12 and 13 are retracted horizontally to their outer limiting position in which they engage the stops l6 and 16', respectively, and are aligned over the stops 17.
  • the upper clamp 13 is raised a sufficient amount, as shown in FIG. 9, so that the shaped corrugation 30 can be shifted to the right beneath the upper die 13.
  • Sheet material 15 is moved to the right through the distance required or performed by the usual feeding apparatus, which has not been shown, so that the parts attain the position shown in FIG. 10.
  • the counterdie 25 is used. Very often this is not necessary, and it is not really necessary in the illustrated embodiment.
  • the forming part or head 21 of forming die 20 is designed with an elliptical crosssection having the longer axis extending horizontally, the same ultimate corrugation would be obtained.
  • a method of forming a series of undercut corrugations in a metal sheet or band comprising the steps of clamping a sheet between spaced pairs of clamps, movable toward and away from each other, at points spaced apart a distance equal to the width of the sheet defining the undercut corrugation to be formed; moving a forming die, having an enlarged head and a narrow neck, perpendicular to the plane of the sheet centrally between the pairs of clamps to engage and deform the sheet while moving the pairs of clamps toward each other to wrap the sheet around the head and neck of the die to form the undercut corrugation; and thereafter opening the undercut corrugation an amount sufficient to provide clearance for retraction of the die head through the undercut portion of the formed undercut corrugation.
  • a method of forming a series of undercut corrugations in a metal sheet or band as claimed in claim 1, in which, when the metal sheet or band is springy, opening of the undercut corrugation is effected by retraction of the forming die.
  • a corrugating station for forming a series of undercut corrugations in a sheet metal or band, comprising in combination, means for intermittently moving said sheet metal or band in a first direction into a position to be corrugated, a forming die having an enlarged continuous cross-sectioned head terminating in a narrow neck, said narrow' neck being mounted for movement perpendicular to the plane of said sheet, a counter die movable in opposition to and alignment with said forming die and having a surface cross-sectioned to mate with said forming die when said surface is moved in contact with said sheet portion wrapped around said forming die by the perpendicular movement of said forming die into engagement with said sheet, and spaced pairs of clamps on each side of said forming die, said clamp pairs being adapted to be moved toward said forming die to form said corrugation and away from said forming die after said corrugation is formed, and means for moving one of said clamps of said clamp pair downstream of the direction of intermittent movement of said sheet metal and on the same side of the sheet metal as said

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
US00340874A 1972-03-14 1973-03-13 Method and apparatus for forming undercut corrugations in sheet metal Expired - Lifetime US3838590A (en)

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Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885410A (en) * 1974-06-26 1975-05-27 John F Kopczynski Feed mechanism for bending machine
US3954218A (en) * 1973-02-20 1976-05-04 Dijk Edsger Wybe Van Method and apparatus for forming sheet metal around tubes
US4449388A (en) * 1980-03-04 1984-05-22 Groko Maskin Ab Method of bending shaped metal sheet and apparatus for carrying out the method
US4573296A (en) * 1984-11-26 1986-03-04 Wrigley John G Construction panel and method of providing the same
US4753099A (en) * 1985-09-18 1988-06-28 Trumpf Gmbh & Co. Bending press for sheet metal
EP0478501A1 (de) * 1990-09-28 1992-04-01 Strub Ag Verbindungsstück zum Verbinden zweier Dachrinnen, Verfahren zur Herstellung des Verbindungsstücks und Vorrichtung zur Durchführung des Verfahrens
US5632178A (en) * 1995-06-05 1997-05-27 Uhlemann; Karl Method and apparatus for forming a T-shaped slot in a sheet material
US5937519A (en) * 1998-03-31 1999-08-17 Zero Corporation Method and assembly for manufacturing a convoluted heat exchanger core
US6128815A (en) * 1997-01-10 2000-10-10 Pullman Industries, Inc. Process of forming a vehicle bed
US6170905B1 (en) 1996-06-10 2001-01-09 Pullman Industries, Inc. Truck bed and method of manufacture
US6347454B1 (en) 1997-01-10 2002-02-19 Pullman Industries, Inc. Vehicle bed edge manufacturing process
KR20030004262A (ko) * 2002-03-18 2003-01-14 박헌양 자성을 이용한 착탈이 용이한 힌지
US20040265536A1 (en) * 2003-05-30 2004-12-30 Toshikazu Sana Method and apparatus for shaping section bar made of composite material and shaped product and I-shaped stringer thereof
US20080053184A1 (en) * 2006-08-31 2008-03-06 Benteler Automobiltechnik Gmbh Method of making a sheet metal part for motor vehicles
US20080150322A1 (en) * 2006-12-22 2008-06-26 David Shelbo Vehicle bed edge construction and manufacturing process therefor
US20090044592A1 (en) * 2007-07-24 2009-02-19 Honda Motor Co., Ltd. Method for manufacturing an edge protector and die assemblies therefor
US20090056402A1 (en) * 2007-08-30 2009-03-05 Boesch Travis J Apparatus and methods for shaping metal sheets
US20100170985A1 (en) * 2007-06-29 2010-07-08 Airbus Uk Limited Composite panel stiffener
US20100170989A1 (en) * 2007-06-29 2010-07-08 Airbus Uk Limited Elongate composite structural members and improvements therein
US20100178453A1 (en) * 2007-06-29 2010-07-15 Airbus Uk Limited Elongate composite structural member
US20110135886A1 (en) * 2008-07-18 2011-06-09 Airbus Operations Limited Ramped stiffener and apparatus andmethod for forming the same
US20110183106A1 (en) * 2008-07-18 2011-07-28 Airbus Operations Limited Ramped stiffener and apparatus and method for forming the same
US20120060347A1 (en) * 2008-08-29 2012-03-15 Hyundai Motor Company Wiring holding flange and manufacturing method thereof
EP3513886A1 (de) * 2018-01-19 2019-07-24 Otto Bihler Handels-Beteiligungs-GmbH Verfahren zum herstellen von zellverbindern
CN111438232A (zh) * 2020-03-17 2020-07-24 武汉城市职业学院 一种异形节点板弯折装置
US10913217B2 (en) * 2015-06-24 2021-02-09 Airbus Operations Gmbh Method and device for series production of components made of a fiber-reinforced composite material

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US469952A (en) * 1892-03-01 Manufacture of metallic vehicle-tongues
US1692033A (en) * 1925-05-02 1928-11-20 American Can Co Cleat-making and cleat and handle assembling machine
AT177308B (de) * 1950-11-08 1954-01-25 Josef Peterhans Verfahren und Maschine zur Herstellung von Gleitverschlüssen
US3461711A (en) * 1964-09-08 1969-08-19 Frank R Ogilvie Corrugating method and apparatus
US3768294A (en) * 1971-03-03 1973-10-30 Dijk E Van Method and machine for corrugating metal sheet

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US469952A (en) * 1892-03-01 Manufacture of metallic vehicle-tongues
US1692033A (en) * 1925-05-02 1928-11-20 American Can Co Cleat-making and cleat and handle assembling machine
AT177308B (de) * 1950-11-08 1954-01-25 Josef Peterhans Verfahren und Maschine zur Herstellung von Gleitverschlüssen
US3461711A (en) * 1964-09-08 1969-08-19 Frank R Ogilvie Corrugating method and apparatus
US3768294A (en) * 1971-03-03 1973-10-30 Dijk E Van Method and machine for corrugating metal sheet

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3954218A (en) * 1973-02-20 1976-05-04 Dijk Edsger Wybe Van Method and apparatus for forming sheet metal around tubes
US3885410A (en) * 1974-06-26 1975-05-27 John F Kopczynski Feed mechanism for bending machine
US4449388A (en) * 1980-03-04 1984-05-22 Groko Maskin Ab Method of bending shaped metal sheet and apparatus for carrying out the method
US4580433A (en) * 1980-03-04 1986-04-08 Groko Maskin Ab Method of bending shaped metal sheet and apparatus for carrying out the method
US4573296A (en) * 1984-11-26 1986-03-04 Wrigley John G Construction panel and method of providing the same
US4753099A (en) * 1985-09-18 1988-06-28 Trumpf Gmbh & Co. Bending press for sheet metal
EP0478501A1 (de) * 1990-09-28 1992-04-01 Strub Ag Verbindungsstück zum Verbinden zweier Dachrinnen, Verfahren zur Herstellung des Verbindungsstücks und Vorrichtung zur Durchführung des Verfahrens
US5632178A (en) * 1995-06-05 1997-05-27 Uhlemann; Karl Method and apparatus for forming a T-shaped slot in a sheet material
US6170905B1 (en) 1996-06-10 2001-01-09 Pullman Industries, Inc. Truck bed and method of manufacture
US6128815A (en) * 1997-01-10 2000-10-10 Pullman Industries, Inc. Process of forming a vehicle bed
US6347454B1 (en) 1997-01-10 2002-02-19 Pullman Industries, Inc. Vehicle bed edge manufacturing process
US5937519A (en) * 1998-03-31 1999-08-17 Zero Corporation Method and assembly for manufacturing a convoluted heat exchanger core
KR20030004262A (ko) * 2002-03-18 2003-01-14 박헌양 자성을 이용한 착탈이 용이한 힌지
US7141199B2 (en) 2003-05-30 2006-11-28 Kawasaki Jukogyo Kabushiki Kaisha Method and apparatus for shaping section bar made of composite material and shaped product and I-shaped stringer thereof
EP1481790A3 (en) * 2003-05-30 2006-03-29 Kawasaki Jukogyo Kabushiki Kaisha Method and apparatus for shaping a section bar made of composite material and shaped I-shaped stringer
US20040265536A1 (en) * 2003-05-30 2004-12-30 Toshikazu Sana Method and apparatus for shaping section bar made of composite material and shaped product and I-shaped stringer thereof
US20080053184A1 (en) * 2006-08-31 2008-03-06 Benteler Automobiltechnik Gmbh Method of making a sheet metal part for motor vehicles
US7654124B2 (en) * 2006-08-31 2010-02-02 Benteler Automobiltechnik Gmbh Method of making a sheet metal part for motor vehicles
US20080150322A1 (en) * 2006-12-22 2008-06-26 David Shelbo Vehicle bed edge construction and manufacturing process therefor
US7731271B2 (en) 2006-12-22 2010-06-08 Noble Advanced Technologies, Inc. Vehicle bed edge construction and manufacturing process therefor
US8864074B2 (en) 2007-06-29 2014-10-21 Airbus Operations Limited Composite panel stiffener
US8864076B2 (en) 2007-06-29 2014-10-21 Airbus Operations Limited Elongate composite structural member
US8864075B2 (en) 2007-06-29 2014-10-21 Airbus Operations Limited Elongate composite structural members and improvements therein
US20100170985A1 (en) * 2007-06-29 2010-07-08 Airbus Uk Limited Composite panel stiffener
US20100170989A1 (en) * 2007-06-29 2010-07-08 Airbus Uk Limited Elongate composite structural members and improvements therein
US20100178453A1 (en) * 2007-06-29 2010-07-15 Airbus Uk Limited Elongate composite structural member
US20090044592A1 (en) * 2007-07-24 2009-02-19 Honda Motor Co., Ltd. Method for manufacturing an edge protector and die assemblies therefor
US7650773B2 (en) * 2007-07-24 2010-01-26 Honda Motor Co., Ltd. Method for manufacturing an edge protector and die assemblies therefor
US20090056402A1 (en) * 2007-08-30 2009-03-05 Boesch Travis J Apparatus and methods for shaping metal sheets
US20110183106A1 (en) * 2008-07-18 2011-07-28 Airbus Operations Limited Ramped stiffener and apparatus and method for forming the same
US8573957B2 (en) 2008-07-18 2013-11-05 Airbus Operations Limited Ramped stiffener and apparatus and method for forming the same
US8662873B2 (en) 2008-07-18 2014-03-04 Airbus Operations Limited Ramped stiffener and apparatus and method for forming the same
US20110135886A1 (en) * 2008-07-18 2011-06-09 Airbus Operations Limited Ramped stiffener and apparatus andmethod for forming the same
US9789653B2 (en) 2008-07-18 2017-10-17 Airbus Operations Limited Ramped stiffener and apparatus and method for forming the same
US20120060347A1 (en) * 2008-08-29 2012-03-15 Hyundai Motor Company Wiring holding flange and manufacturing method thereof
US10913217B2 (en) * 2015-06-24 2021-02-09 Airbus Operations Gmbh Method and device for series production of components made of a fiber-reinforced composite material
EP3513886A1 (de) * 2018-01-19 2019-07-24 Otto Bihler Handels-Beteiligungs-GmbH Verfahren zum herstellen von zellverbindern
CN111438232A (zh) * 2020-03-17 2020-07-24 武汉城市职业学院 一种异形节点板弯折装置
CN111438232B (zh) * 2020-03-17 2021-11-19 武汉城市职业学院 一种异形节点板弯折装置

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NL7203324A (enrdf_load_html_response) 1973-09-18

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