EP0654312B1 - Device and method for the forming of corrugated sheets having flat parallel marginal portions - Google Patents

Device and method for the forming of corrugated sheets having flat parallel marginal portions Download PDF

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Publication number
EP0654312B1
EP0654312B1 EP94118266A EP94118266A EP0654312B1 EP 0654312 B1 EP0654312 B1 EP 0654312B1 EP 94118266 A EP94118266 A EP 94118266A EP 94118266 A EP94118266 A EP 94118266A EP 0654312 B1 EP0654312 B1 EP 0654312B1
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EP
European Patent Office
Prior art keywords
stamping tool
hydraulic
outer edge
press
stamping
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94118266A
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German (de)
French (fr)
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EP0654312A1 (en
Inventor
Ingolf Doose
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Umformtechnik Stade GmbH
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Umformtechnik Stade GmbH
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Filing date
Publication date
Application filed by Umformtechnik Stade GmbH filed Critical Umformtechnik Stade GmbH
Publication of EP0654312A1 publication Critical patent/EP0654312A1/en
Application granted granted Critical
Publication of EP0654312B1 publication Critical patent/EP0654312B1/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B12/00—Presses not provided for in groups B30B1/00 - B30B11/00
    • 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
    • B21D19/00—Flanging or other edge treatment, e.g. of tubes
    • B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/06—Stamping using rigid devices or tools having relatively-movable die parts
    • 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/08—Dies with different parts for several steps in a process

Definitions

  • the invention relates to a device for producing corrugated sheets with plane-parallel outer edge surfaces with a hydraulic or mechanical press with at least one hydraulic or Pneumatic cylinder and at least one upper and lower embossing tool, the are provided with embossing tool end pieces at their opposite ends.
  • Such a device is described for example in DE-A-20 29 528, in which also a the associated process is described, in which beads are first formed into a sheet, which extend in their longitudinal directions to the edge areas of the sheet. In a second However, the end areas of the respective beads are then squeezed and deformed back towards the sheet metal exit plane, but do not reach it all.
  • These measures create z-shaped pinch folds, so that between each two such pinch folds of a bead in the area of the outer edge surfaces outside the sheet metal exit plane remains, which is undesirable and the task of the application Invention can not meet.
  • a capillarity forms on the pinch folds, through which air and moisture can penetrate into the pinch folds, so that use such sheets for the manufacture z. B. is excluded from refrigerated containers. These are on it instructed to have airtight outer walls to keep out moisture Effect of the insulating layer destroyed within a short time, reliably preventing it.
  • the object of the present invention is therefore to provide a device of the type mentioned in the introduction create, with the help of corrugated sheets can be produced, in which the illustrated Advantages used and the disadvantages also shown can be avoided.
  • the invention further relates to a method for producing corrugated sheets with plane-parallel Outer edge surfaces in a hydraulic or mechanical press, with top and bottom Embossing tools open beads are molded into a sheet, including each a bead associated with outer edge surfaces.
  • each associated with a bead Outer edge surfaces then again in their sheet metal starting plane before the molding of the bead be reshaped while the sheet metal is between the upper and lower embossing tools the press is clamped.
  • the device essentially consists of a hydraulic or mechanical press (1) with at least one hydraulic or pneumatic cylinder (2) and at least one upper one Embossing tool (3) and a lower embossing product (4), each facing away from one another Ends 5 with an upper embossing tool end piece 6 and a lower embossing tool end piece 7 are provided. 6 and 7 are integrated in the embossing tool end pieces Hydraulic or pneumatic cylinders 8, 9 are provided, which are provided with contour stamps 10, 11.
  • the contour stamp 10 has in the upper embossing tool end piece 6 the same contour 12 as the upper one Embossing tool 3 and the contour stamp 11 in the lower Embossing tool end piece 7, however, has the same contour 13 as the lower embossing tool 4.
  • the lower stamping tool 4 is on a fixed press table 14 attached.
  • the cylinders 8 and 9 are equipped with a (not shown) Hydraulic or pneumatic unit connected.
  • a sheet 15 to be deformed is placed between the upper one Stamping tool 3 and the lower stamping tool 4 inserted.
  • the cylinders 8 in the upper embossing tool end pieces 6 are in a depressurized state.
  • the Cylinder 9 of the lower embossing tool end pieces 7 are located yourself in the printing state.
  • the contour stamps 10 and 11 are also located in its upper end position. Is the adhesion between the upper and lower embossing tools and the Contour stamp 10, 11 made, the downward movement the press 1 stopped.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zur Herstellung von Sickenblechen mit planparallelen Außenkantenflächen mit einer hydraulischen oder mechanischen Presse mit mindestens einem Hydraulik-oder Pneumatikzylinder und mindestens je einem oberen und unteren Prägewerkzeug, die an ihren einander abgewandten Enden mit Prägewerkzeugendstücken versehen sind.The invention relates to a device for producing corrugated sheets with plane-parallel outer edge surfaces with a hydraulic or mechanical press with at least one hydraulic or Pneumatic cylinder and at least one upper and lower embossing tool, the are provided with embossing tool end pieces at their opposite ends.

Eine derartige Vorrichtung ist beispielsweise beschrieben in der DE-A-20 29 528, in der auch ein dazugehöriges Verfahren beschrieben wird, in dem zunächst in ein Blech Sicken eingeformt werden, die in ihren Längsrichtungen bis in die Kantenbereiche des Bleches reichen. In einem zweiten Arbeitsgang werden dann jedoch die Endbereiche der jeweiligen Sicken zusammengequetscht und wieder in Richtung auf die Blechausgangsebene zurückverformt, erreichen diese jedoch nicht ganz. Durch diese Maßnahmen entstehen z -förmige Quetschfalten, so daß die zwischen jeweils zwei solchen Quetschfalten einer Sicke das Blech im Bereich der Außenkantenflächen außerhalb der Blechausgangsebene verbleibt, was unerwünscht ist und die Aufgabe der anmeldungsgemäßen Erfindung nicht erfüllen kann. Insbesondere bildet sich an den Quetschfalten eine Kapillarität aus, durch die in die Quetschfalten Luft und Feuchtigkeit eindringen können, so daß eine Verwendung derartiger Bleche für die Herstellung z. B. von Kühlcontainern ausgeschlossen ist. Diese sind darauf angewiesen, luftdichte Außenwände zu haben, um das Eindringen von Feuchtigkeit, die die Wirkung der Isolierschicht binnen kurzem zerstört, zuverlässig zu verhindern.Such a device is described for example in DE-A-20 29 528, in which also a the associated process is described, in which beads are first formed into a sheet, which extend in their longitudinal directions to the edge areas of the sheet. In a second However, the end areas of the respective beads are then squeezed and deformed back towards the sheet metal exit plane, but do not reach it all. These measures create z-shaped pinch folds, so that between each two such pinch folds of a bead in the area of the outer edge surfaces outside the sheet metal exit plane remains, which is undesirable and the task of the application Invention can not meet. In particular, a capillarity forms on the pinch folds, through which air and moisture can penetrate into the pinch folds, so that use such sheets for the manufacture z. B. is excluded from refrigerated containers. These are on it instructed to have airtight outer walls to keep out moisture Effect of the insulating layer destroyed within a short time, reliably preventing it.

Eine weitere Vorrichtung ist beispielsweise beschrieben in der deutschen Patentanmeldung P 36 10 022-6. Die mit dieser Vorrichtung gefertigten Bleche weisen geschlossene Sicken auf, so daß ihre Seitenflächen planparallel zueinander verlaufen. Dies hat den Vorteil, daß bei einer Verbindung quer zum Sickenverlauf das Blech mit einem anderen gradlinig verlaufenden Gegenstand verschweißt werden kann und dieses ohne weitere Maßnahmen erfolgen kann, da an den Stoßstellen der Bleche keine Lücken, offene Stellen oder Hohlräume entstehen. Die Vorrichtung hat jedoch den Nachteil, daß die Herstellung einer geschlossenen Sicke erheblichen technologischen und Werkzeugaufwand erfordert und im übrigen eine Blechstärkenreduzierung im Sickenauslaufbereich auftreten kann.Another device is described, for example, in German patent application P 36 10 022-6. The sheets made with this device have closed beads, so that their side surfaces are plane-parallel to each other. This has the advantage that with a connection the sheet metal with another straight-line object transverse to the bead can be welded and this can be done without further measures, because at the joints there are no gaps, open spaces or cavities in the sheets. However, the device has the disadvantage that the production of a closed bead considerable technological and tooling required and, moreover, a reduction in sheet thickness in the bead outlet area can occur.

Ferner gibt es Vorrichtungen, mit deren Hilfe offene Sicken hergestellt werden können, die sich über die gesamte Länge bzw. Breite eines Bleches erstrecken. Der Vorteil einer derartigen Vorrichtung liegt darin, daß die Sickenbleche mit relativ einfachen oberen und unteren Prägewerkzeugen hergestellt werden können und die Blechstärken im Sickenbereich konstant sind.There are also devices with the help of which open beads can be produced which can be extend over the entire length or width of a sheet. The advantage of such a device is that the corrugated sheets with relatively simple upper and lower embossing tools can be produced and the sheet thicknesses in the bead area are constant.

Eine solche Vorrichtung hat aber den Nachteil, daß bei Verbindung eines Bleches mit offenen Sicken mit einem anderen gradlinig verlaufenen Gegenstand, z. B. wenn es mit einem anderen Blech verschweißt werden muß, die Hohlräume zwischen dem anderen Gegenstand und der offenen Sicke ausgefüllt werden müssen, um geschlossen werden zu können. Dies erfordert hohen Arbeits- und damit Kostenaufwand.However, such a device has the disadvantage that when a sheet is connected to an open one Beads with another straight-line object, e.g. B. if it is with another Sheet metal must be welded to the voids between the other object and the open one Bead must be filled in before it can be closed. This requires high Labor and thus cost.

Aufgabe der vorliegenden Erfindung ist es daher, eine Vorrichtung der eingangs genannten Art zu schaffen, mit deren Hilfe Sickenbleche hergestellt werden können, bei denen die dargestellten Vorteile genutzt und die ebenfalls dargestellten Nachteile vermieden werden können.The object of the present invention is therefore to provide a device of the type mentioned in the introduction create, with the help of corrugated sheets can be produced, in which the illustrated Advantages used and the disadvantages also shown can be avoided.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß in den Prägewerkzeugendstücken Hydraulik-oder Pneumatikzylinder mit Konturenstempeln angeordnet sind, die relativ beweglich zu Bewegungen des oberen Prägewerkzeuges ausgebildet sind.This object is achieved in that hydraulic or Pneumatic cylinders are arranged with contour stamps that are relatively movable Movements of the upper embossing tool are formed.

Die Erfindung betrifft ferner ein Verfahren zur Herstellung von Sickenblechen mit planparallelen Außenkantenflächen in einer hydraulischen oder mechanischen Presse, wobei mit oberen und unteren Prägewerkzeugen offene Sicken in ein Blech eingeformt werden unter Einschluß der jeweils einer Sicke zugeordneten Außenkantenflächen.The invention further relates to a method for producing corrugated sheets with plane-parallel Outer edge surfaces in a hydraulic or mechanical press, with top and bottom Embossing tools open beads are molded into a sheet, including each a bead associated with outer edge surfaces.

Aufgabe der vorliegenden Erfindung ist es insoweit ferner, ein Verfahren der vorgenannten Art zu schaffen, durch das mit geringem technologischen und mechanischen Aufwand Bleche mit den geforderten Eigenschaften hergestellt werden können.To this extent, it is also an object of the present invention to provide a method of the aforementioned type create, with the sheet metal with the little technological and mechanical effort required properties can be produced.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die jeweils einer Sicke zugeordneten Außenkantenflächen dann wieder in ihre vor der Einformung der Sicke eingenommene Blechausgangsebene zurückverformt werden, während das Blech zwischen dem oberen und unteren Prägewerkzeugen der Presse eingespannt ist.This object is achieved in that each associated with a bead Outer edge surfaces then again in their sheet metal starting plane before the molding of the bead be reshaped while the sheet metal is between the upper and lower embossing tools the press is clamped.

Dies hat den Vorteil, daß Bleche hergestellt werden können, ohne daß Nachfließerscheinungen von Material im Sickenauslaufbereich auftreten. Eine Nachbearbeitung der Bleche zur (Wieder-) herstellung gerader Außenkanten und planparalleler Außenkantenflächen der Sickenbleche ist entbehrlich.This has the advantage that sheet metal can be produced without any afterflow phenomena of material occur in the bead outlet area. Post-processing of the sheets for (re) production of straight outer edges and plane-parallel outer edge surfaces of the corrugated sheets dispensable.

Weitere Einzelheiten der Erfindung ergeben sich aus der nachfolgenden ausführlichen Beschreibung sowie aus den beigefügten Zeichnungen, in denen eine bevorzugte Ausführungsform der Erfindung beispielsweise veranschaulicht ist. In den Zeichnungen zeigen:

Figur 1:
eine schematische Darstellung einer Presse in Seitenansicht und
Figur 2:
eine schematische Darstellung eines Teils einer erfindungsgemäßen Vorrichtung in Vorderansicht
Further details of the invention will become apparent from the following detailed description and from the accompanying drawings, in which a preferred embodiment of the invention is illustrated for example. The drawings show:
Figure 1:
a schematic representation of a press in side view
Figure 2:
a schematic representation of part of a device according to the invention in front view

Die Vorrichtung besteht im wesentlichen aus einer hydraulischen oder mechanischen Presse (1) mit mindestens einem Hydraulik- oder Pneumatikzylinder (2) und mindestens je einem oberen Prägewerkzeug (3) und einem unteren Prägewerzeug (4), die an ihren jeweils einander abgewandten Enden 5 mit je einem oberen Prägewerkzeugendstück 6 und einem unteren Prägewerkzeugendstück 7 versehen sind. Dabei sind in den Prägewerkzeugendstücken 6 und 7 integrierte Hydraulik- oder Pneumatikzylinder 8, 9 vorgesehen, die mit Konturenstempeln 10, 11 versehen sind. Dabei weist der Konturenstempel 10 im oberen Prägewerkzeugendstück 6 die gleiche Kontur 12 auf wie das obere Prägewerkzeug 3 und der Konturenstempel 11 im unteren Prägewerkzeugendstück 7 weist dagegen die gleiche Kontur 13 wie das untere Prägewerkzeug 4 auf. Das untere Prägewerkzeug 4 ist auf einem feststehenden Pressentisch 14 befestigt.The device essentially consists of a hydraulic or mechanical press (1) with at least one hydraulic or pneumatic cylinder (2) and at least one upper one Embossing tool (3) and a lower embossing product (4), each facing away from one another Ends 5 with an upper embossing tool end piece 6 and a lower embossing tool end piece 7 are provided. 6 and 7 are integrated in the embossing tool end pieces Hydraulic or pneumatic cylinders 8, 9 are provided, which are provided with contour stamps 10, 11. The contour stamp 10 has in the upper embossing tool end piece 6 the same contour 12 as the upper one Embossing tool 3 and the contour stamp 11 in the lower Embossing tool end piece 7, however, has the same contour 13 as the lower embossing tool 4. The lower stamping tool 4 is on a fixed press table 14 attached.

Die Zylinder 8 und 9 sind mit einem (nicht dargestellten) Hydraulik- oder Pneumatikaggregat verbunden.The cylinders 8 and 9 are equipped with a (not shown) Hydraulic or pneumatic unit connected.

Zur Herstellung von Sickenblechen mit planparallelen Außenkantenflächen wird wie folgt verfahren:For the production of corrugated sheets with plane-parallel Outer edge surfaces are operated as follows:

Ein zu verformendes Blech 15 wird zwischen das obere Prägewerkzeug 3 und das untere Prägewerkzeug 4 eingelegt. Die Zylinder 8 in den oberen Prägewerkzeugendstücken 6 befinden sich in drucklosem Zustand. Die Zylinder 9 der unteren Prägewerkzeugendstücke 7 befinden sich im Druckzustand. Durch die Abwärtsbewegung der Presse 1 wird das zu verformende Blech entsprechend den vorgegebenen Konturen geprägt, bis das obere Prägewerkzeug 3 und das untere Prägewerkzeug 4 mit dem dazwischenliegenden Blech 15 kraftschlüssig in Kontakt sind. Die Konturenstempel 10 und 11 befinden sich ebenfalls in ihrer oberen Endstellung. Ist der Kraftschluß zwischen den oberen und unteren Prägewerkzeugen und den Konturenstempeln 10, 11 hergestellt, wird die Abwärtsbewegung der Presse 1 gestoppt. Durch einen Impuls wird jetzt das Hydraulik- oder Pneumatikaggregat so umgesteuert, daß die Zylinder 8 in den oberen Prägewerkzeugendstücken mit einem solchen Druck versehen werden, daß die Konturenstempel 11 in den unteren Prägewerkzeugendstücken 7 und die Zylinder 9 soweit zurückgedrückt werden, daß das vorher verformte Blech 15 im Bereich der Konturenstempel10, 11, d.h. im Bereich seiner Außenkantenflächen 16 wieder in die vorher eingenommene Blechausgangslage zurückgedrückt wird. Sobald dieser Vorgang abgeschlossen ist, wird die gestoppte Abwärtsbewegung der Presse 1 umgesteuert in die Aufwärtsbewegung.A sheet 15 to be deformed is placed between the upper one Stamping tool 3 and the lower stamping tool 4 inserted. The cylinders 8 in the upper embossing tool end pieces 6 are in a depressurized state. The Cylinder 9 of the lower embossing tool end pieces 7 are located yourself in the printing state. By the downward movement of the Press 1 is the sheet to be deformed according to the predetermined contours until the upper embossing tool 3 and the lower stamping tool 4 with the intermediate one Sheet 15 non-positively in contact are. The contour stamps 10 and 11 are also located in its upper end position. Is the adhesion between the upper and lower embossing tools and the Contour stamp 10, 11 made, the downward movement the press 1 stopped. With an impulse now the hydraulic or pneumatic unit is reversed so that the cylinders 8 in the upper die end pieces be provided with such a pressure, that the contour stamp 11 in the lower embossing tool end pieces 7 and the cylinders 9 pushed back so far be that the previously deformed sheet 15 in the area of Contour stamp 10, 11, i.e. in the area of its outer edge surfaces 16 again in the previously assumed sheet metal starting position is pushed back. Once this process is completed, the stopped downward movement the press 1 reversed in the upward movement.

Claims (7)

  1. An apparatus for manufacturing beaded metal sheets with plane-parallel outer edge faces, having a hydraulic or mechanical press comprising at least one hydraulic or pneumatic cylinder and comprising at least one upper and lower stamping tool (3, 4) in each case which are provided with stamping tool end pieces (6, 7) at their ends (5) facing away from each other, characterised in that hydraulic or pneumatic cylinders (8, 9) having contoured dies (10, 11) are disposed in the stamping tool end pieces (6, 7), which contoured dies are constructed so that they can move in relation to movements of the upper stamping tool (3).
  2. An apparatus according to claim 1, characterised in that the contoured dies (10, 11) are constructed so that they can move in the same directions as the upper stamping tool (3).
  3. An apparatus according to claims 1 and 2, characterised in that the contoured dies (10, 11) can move in opposite directions to the directions of movement of the upper stamping tool (3).
  4. An apparatus according to claims 1 to 3, characterised in that the lower stamping tool (4) is fixed to a press table (14) of the press (1).
  5. An apparatus according to claims 1 to 4, characterised in that the stamping tool end pieces (6, 7) are immovably attached to the stamping tools (3, 4).
  6. An apparatus according to claims 1 to 5, characterised in that the contoured dies (10, 11) are provided with contours (12, 13) which correspond to those of the stamping tools (3, 4) attached to them.
  7. A process for manufacturing beaded metal sheets with plane-parallel outer edge faces in a hydraulic or mechanical press, wherein open beads are formed in a metal sheet (15) by upper and lower stamping tools (3, 4), with the inclusion of outer edge faces (16) which are each associated with a bead, characterised in that the outer edge faces are then formed back again into their metal sheet initial plane which they take up before the bead is formed, whilst the metal sheet is clamped between the upper and lower stamping tools (3, 4) of the press (1).
EP94118266A 1993-11-24 1994-11-19 Device and method for the forming of corrugated sheets having flat parallel marginal portions Expired - Lifetime EP0654312B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4339962A DE4339962A1 (en) 1993-11-24 1993-11-24 Device and method for producing corrugated sheets with plane-parallel outer edge surfaces
DE4339962 1993-11-24

Publications (2)

Publication Number Publication Date
EP0654312A1 EP0654312A1 (en) 1995-05-24
EP0654312B1 true EP0654312B1 (en) 1998-07-22

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ID=6503276

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Application Number Title Priority Date Filing Date
EP94118266A Expired - Lifetime EP0654312B1 (en) 1993-11-24 1994-11-19 Device and method for the forming of corrugated sheets having flat parallel marginal portions

Country Status (4)

Country Link
US (1) US5632180A (en)
EP (1) EP0654312B1 (en)
KR (1) KR100377041B1 (en)
DE (2) DE4339962A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19856950B4 (en) * 1998-12-10 2007-08-30 Umformtechnik Stade Gmbh Apparatus and method for producing beaded sheets with a plurality of closed beads

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Publication number Priority date Publication date Assignee Title
JP4032304B2 (en) * 2003-03-17 2008-01-16 トヨタ自動車株式会社 Method and apparatus for partial strengthening of metal material
DE102005012580B4 (en) * 2004-11-08 2018-02-08 Umformtechnik Stade Gmbh Method and device for producing sheets of high material thickness or low elongation at break with closed beads
US7591696B1 (en) 2008-05-19 2009-09-22 Embarq Holdings Company, Llc Ground bonding strap
JP6120006B2 (en) * 2014-03-19 2017-04-26 トヨタ紡織株式会社 Metal plate press forming method and press forming apparatus
CN106180338B (en) * 2016-07-01 2018-08-24 武汉思凯精冲模具有限责任公司 It is a kind of that there are two multifunction hydraulic stamping systems and application method to auxiliary power

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US1462475A (en) * 1921-06-04 1923-07-24 E E Souther Iron Company Method of crushing corrugated metal
US2753918A (en) * 1952-09-26 1956-07-10 Paul D Bradfield Metal expansion and contraction material and method and apparatus for forming the same
FR72739E (en) * 1956-10-05 1960-07-22 Degussa Process for treating polyamide fibers and fibers conforming to those obtained
SE347172B (en) * 1969-07-14 1972-07-31 Svenska Flaektfabriken Ab
DE2332899A1 (en) * 1973-06-28 1975-01-16 Chrubasik Paul Making grooves or projections in sheet metal - using rows of hydraulic clamping plungers for precise dimensional control
DE2703694A1 (en) * 1976-02-02 1977-08-04 Francon METHOD AND APPARATUS FOR MANUFACTURING RIBBED METAL PROFILES AND PROFILES MANUFACTURED BY THIS PROCESS
FR2510915A1 (en) * 1981-08-07 1983-02-11 Venissieux Atel PROCESS FOR MANUFACTURING CLOSED RIBBED PANELS
WO1987003518A1 (en) * 1985-12-12 1987-06-18 Australian Design Marketing Pty. Ltd. Press forming sheet metal
DE3610022C2 (en) * 1986-03-25 1996-03-14 Stade Umformtechnik Gmbh Method and device for producing beads in a sheet
US5333482A (en) * 1992-10-30 1994-08-02 Solar Turbines Incorporated Method and apparatus for flattening portions of a corrugated plate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19856950B4 (en) * 1998-12-10 2007-08-30 Umformtechnik Stade Gmbh Apparatus and method for producing beaded sheets with a plurality of closed beads

Also Published As

Publication number Publication date
US5632180A (en) 1997-05-27
DE59406485D1 (en) 1998-08-27
KR950013703A (en) 1995-06-15
KR100377041B1 (en) 2003-05-17
EP0654312A1 (en) 1995-05-24
DE4339962A1 (en) 1995-06-01

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