EP1502672B1 - Apparatus for making articles by internal high pressure forming - Google Patents

Apparatus for making articles by internal high pressure forming Download PDF

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Publication number
EP1502672B1
EP1502672B1 EP04016054A EP04016054A EP1502672B1 EP 1502672 B1 EP1502672 B1 EP 1502672B1 EP 04016054 A EP04016054 A EP 04016054A EP 04016054 A EP04016054 A EP 04016054A EP 1502672 B1 EP1502672 B1 EP 1502672B1
Authority
EP
European Patent Office
Prior art keywords
tool
tool carrier
pressure
high pressure
pressure medium
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
EP04016054A
Other languages
German (de)
French (fr)
Other versions
EP1502672B2 (en
EP1502672A1 (en
Inventor
Dieter Kapp
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.)
Theodor Graebener GmbH and Co KG
Original Assignee
Theodor Graebener GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Application filed by Theodor Graebener GmbH and Co KG filed Critical Theodor Graebener GmbH and Co KG
Publication of EP1502672A1 publication Critical patent/EP1502672A1/en
Application granted granted Critical
Publication of EP1502672B1 publication Critical patent/EP1502672B1/en
Publication of EP1502672B2 publication Critical patent/EP1502672B2/en
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Expired - Lifetime legal-status Critical Current

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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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/021—Deforming sheet bodies
    • B21D26/025—Means for controlling the clamping or opening of the moulds
    • 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/021—Deforming sheet bodies
    • B21D26/031—Mould construction
    • 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/039—Means for controlling the clamping or opening of the moulds
    • 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/047—Mould construction

Definitions

  • the invention relates to a device for the production of molded parts by hydroforming.
  • Such device are well known as presses. Such presses are very bulky due to their design and the required dimensions by the forces occurring during the forming process.
  • the invention is therefore an object of the invention to provide a device of the type specified, which is very compact and with the very small forces in a small space very high forces can be absorbed without a deflection of the device or the tool occurs and thus very high Accuracies of the molding can be achieved.
  • the device according to the invention is characterized in particular by the fact that it is relatively compact and has only a minimum of functions, whereby a significant cost reduction for such a device is achieved.
  • the device is characterized by the fact that during the forming process, the stresses occurring in the two nested tubes distribute, whereby the device can be subjected to much higher forces without a deflection of the device or the tool and thus the molded part occurs ,
  • the arranged between the tool carrier and mold halves short-stroke cylinders ensure that the tool is optimally held during the forming process.
  • the device 1 shown in the figures for the production of moldings by hydroforming consists essentially of a housing 2 of two nested and interconnected by shrinkage pipes 3, 4. It is in the concentric bore 5 of the inner tube 4, a tool carrier unit 6 is used, which can be moved out of the housing 2 for workpiece change.
  • the tool carrier unit 6 again consists essentially of two approximately half-shell-shaped tool carriers 7a, 7b, between which a tool 8 is arranged, wherein in each case between tool carrier 7a, 7b and mold half 8a, 8b at least one with a pressure medium, for example oil, acted upon Kurzhubzylinder 9a, 9b is arranged.
  • a pressure medium for example oil
  • the short-stroke cylinders 9a, 9b each consist of a piston 10, which is embedded and sealed in a bore 11 in the tool carriers 7a, 7b.
  • the Kurzhubzylinder 9a, 9b hold during the forming process, the two tool halves 8a, 8b in their closed position, while the tool 8 and the workpiece 12 between the two mold halves 8a, 8b in the molding process with a medium, such as water or oil, is applied.
  • a medium such as water or oil
  • Pressure pad 14 may be provided.
  • the respective pressure pad 14 is inserted through one of a 15 inserted into a groove Seal enclosed active surface 16 on the circumference 13 of the shell-shaped tool carrier 7 a, 7 b formed (see Fig. 3).

Landscapes

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

Abstract

Device for producing molded parts by inner high pressure deformation comprises a housing (2) formed by pipes (3, 4) which are connected together by shrinking, and a tool support unit (6) consisting of half-shells (7a, 7b) and inserted into the hole of the inner pipe. A short-stroke cylinder (9a, 9b) impinged with pressure medium is arranged between each half shell and each tool half. The cylinder holds the workpiece halves in their closing position. Preferred Features: A pressure cushion impinged with a pressure medium is provided on the outer periphery of the workpiece support unit. The pressure cushion is formed by an active surface enclosed by a seal inserted into a groove on the periphery of the support unit.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zur Herstellung von Formteilen durch Innenhochdruckumformung.The invention relates to a device for the production of molded parts by hydroforming.

Solche Vorrichtung sind als Pressen hinlänglich bekannt. Derartige Pressen sind aufgrund ihrer Bauweise und den erforderlichen Dimensionierungen durch die auftretenden Kräfte während des Umformprozesses sehr platzraubend.Such device are well known as presses. Such presses are very bulky due to their design and the required dimensions by the forces occurring during the forming process.

Die in der WO-A-00/27563 offenbarte Vorrichtung ist nächstliegender Stand der Technik.The in the WO-A-00/27563 The disclosed device is the closest prior art.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Vorrichtung der angegebenen Gattung zu schaffen, die sehr kompakt gebaut ist und mit der dennoch auf kleinem Raum sehr hohe Kräfte aufgenommen werden können, ohne daß eine Durchbiegung der Vorrichtung bzw. des Werkzeugs auftritt und somit sehr hohe Genauigkeiten des Formteils erreicht werden.The invention is therefore an object of the invention to provide a device of the type specified, which is very compact and with the very small forces in a small space very high forces can be absorbed without a deflection of the device or the tool occurs and thus very high Accuracies of the molding can be achieved.

Diese Aufgabe wird erfindungsgemäß durch eine Vorrichtung mit den Merkmalen des Patentanspruchs 1 gelöst.This object is achieved by a device with the features of claim 1.

Zweckmäßige Weiterbildungen der Erfindung sind den Unteransprüchen zu entnehmen.Advantageous developments of the invention can be found in the dependent claims.

Die erfindungsgemäße Vorrichtung zeichnet sich vor allem dadurch aus, daß dieselbe relativ kompakt ausgebildet ist und nur ein Minimum an Funktionen aufweist, wodurch eine erhebliche Kostenreduzierung für eine solche Vorrichtung erreicht wird.The device according to the invention is characterized in particular by the fact that it is relatively compact and has only a minimum of functions, whereby a significant cost reduction for such a device is achieved.

Ferner zeichnet sich die Vorrichtung dadurch aus, daß während des Umformprozesses sich die auftretenden Spannungen in den beiden ineinandergesetzten Rohren verteilen, wodurch die Vorrichtung mit wesentlich höheren Kräften beaufschlagt werden kann, ohne daß eine Durchbiegung der Vorrichtung bzw. des Werkzeugs und somit des hergestellten Formteils auftritt.Furthermore, the device is characterized by the fact that during the forming process, the stresses occurring in the two nested tubes distribute, whereby the device can be subjected to much higher forces without a deflection of the device or the tool and thus the molded part occurs ,

Die zwischen Werkzeugträger und Werkzeughälften angeordneten Kurzhubzylinder sorgen dafür, daß das Werkzeug während des Umformprozesses optimal zugehalten wird.The arranged between the tool carrier and mold halves short-stroke cylinders ensure that the tool is optimally held during the forming process.

Weitere Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung anhand von die Erfindung wiedergebenden und in der Zeichnung dargestellten Ausführungsbeispielen. Dabei zeigt

Fig. 1
eine schematische Querschnittsdarstellung eines ersten Ausführungsbeispiels einer erfindungsgemäßen Vorrichtung,
Fig. 2
die Querschnittsdarstellung der Vorrichtung mit Druckbeaufschlagung ohne Werkzeug und Kurzhubzylinder und
Fig. 3
in Sprengdarstellung ein zweites Ausführungsbeispiel der Vorrichtung.
Further advantages of the invention will become apparent from the following description with reference to the invention reproducing and illustrated in the drawings embodiments. It shows
Fig. 1
a schematic cross-sectional view of a first embodiment of a device according to the invention,
Fig. 2
the cross-sectional view of the device with pressurization without tools and Kurzhubzylinder and
Fig. 3
in exploded view, a second embodiment of the device.

Die in den Figuren dargestellte Vorrichtung 1 zur Herstellung von Formteilen durch Innenhochdruckumformung besteht im wesentlichen aus einem Gehäuse 2 aus zwei ineinandergesteckten und durch Schrumpfung miteinander verbundenen Rohren 3, 4. Dabei ist in die konzentrische Bohrung 5 des Innenrohres 4 eine Werkzeugträgereinheit 6 eingesetzt, die aus dem Gehäuse 2 zum Werkstückwechsel herausfahrbar ist.The device 1 shown in the figures for the production of moldings by hydroforming consists essentially of a housing 2 of two nested and interconnected by shrinkage pipes 3, 4. It is in the concentric bore 5 of the inner tube 4, a tool carrier unit 6 is used, which can be moved out of the housing 2 for workpiece change.

Die Werkzeugträgereinheit 6 besteht wiederum im wesentlichen aus zwei etwa halbschalenförmigen Werkzeugträgern 7a, 7b, zwischen denen ein Werkzeug 8 angeordnet ist, wobei jeweils zwischen Werkzeugträger 7a, 7b und Werkzeughälfte 8a, 8b mindestens ein mit einem Druckmedium, beispielsweise Öl, beaufschlagbarer Kurzhubzylinder 9a, 9b angeordnet ist. Wie in Fig. 1 erkennbar, bestehen die Kurzhubzylinder 9a, 9b jeweils aus einem Kolben 10, der in einer Bohrung 11 in den Werkzeugträgern 7a, 7b eingebettet und abgedichtet ist.The tool carrier unit 6 again consists essentially of two approximately half-shell-shaped tool carriers 7a, 7b, between which a tool 8 is arranged, wherein in each case between tool carrier 7a, 7b and mold half 8a, 8b at least one with a pressure medium, for example oil, acted upon Kurzhubzylinder 9a, 9b is arranged. As can be seen in FIG. 1, the short-stroke cylinders 9a, 9b each consist of a piston 10, which is embedded and sealed in a bore 11 in the tool carriers 7a, 7b.

Die Kurzhubzylinder 9a, 9b halten während des Umformungsprozesses die beiden Werkzeughälften 8a, 8b in Ihrer Schließposition, während das Werkzeug 8 bzw. das Werkstück 12 zwischen den beiden Werkzeughälften 8a, 8b beim Unformprozeß mit einem Medium, beispielsweise Wasser oder Öl, beaufschlagt wird.The Kurzhubzylinder 9a, 9b hold during the forming process, the two tool halves 8a, 8b in their closed position, while the tool 8 and the workpiece 12 between the two mold halves 8a, 8b in the molding process with a medium, such as water or oil, is applied.

Durch das Ineinanderstecken der zwei Rohre 3, 4 zu einem Gehäuse 2 und durch eine gezielte Aufbringung einer Gegenvorspannung durch Aufschrumpfen der beiden Rohre 3, 4 zueinander wird entgegen der Verwendung eines einzelnen Rohres als Gehäuse oder eines Rechteckrahmens als Gehäuse eine erhebliche Reduzierung der maximalen Spannungen erreicht.By nesting the two tubes 3, 4 to a housing 2 and by a targeted application of a counter-bias by shrinking the two tubes 3, 4 to each other, a considerable reduction of the maximum stresses is achieved contrary to the use of a single tube as a housing or a rectangular frame as a housing ,

Bei extrem hohen Drücken und ggf. zum Ausgleich von Verformungen der Rohre 3, 4 im Bereich der halbschalenförmigen Werkzeugträger 7a, 7b kann am äußeren Umfang 13 der Werkzeugträger 7a, 7b ober- bzw. unterhalb der Kurzhubzylinder 9a, 9b jeweils ein mit einem Druckmedium beaufschlagbares Druckkissen 14 vorgesehen sein. Dabei ist das jeweilige Druckkissen 14 durch eine von einer in eine Nut 15 eingesetzte Dichtung umschlossenen Wirkfläche 16 auf dem Umfang 13 der halbschalenförmigen Werkzeugträger 7a, 7b gebildet (siehe Fig. 3).At extremely high pressures and possibly to compensate for deformations of the tubes 3, 4 in the region of the half-shell-shaped tool carrier 7a, 7b can on the outer periphery 13 of the tool carrier 7a, 7b above or below the short-stroke cylinders 9a, 9b each acted upon by a pressure medium Pressure pad 14 may be provided. In this case, the respective pressure pad 14 is inserted through one of a 15 inserted into a groove Seal enclosed active surface 16 on the circumference 13 of the shell-shaped tool carrier 7 a, 7 b formed (see Fig. 3).

Claims (4)

  1. Apparatus for manufacturing moulded parts by internal high pressure forming, characterized in that the apparatus (1) consists of a housing (2) of two tubes (3, 4), one inserted in the other and connected together by shrinking, wherein a tool carrier unit (6) is inserted in the concentric bore (5) of the inner tube (4).
  2. Apparatus according to claim 1, characterized in that the tool carrier unit (6) consists of two tool carriers (7a, 7b) of approximately half shell form, on which is fixed a tool (8), wherein at least one short stroke cylinder (9a, 9b) which can be subjected to a pressure medium is arranged between each tool carrier (7a, 7b) and tool half (8a, 8b) and holds the two tool halves (8a, 8b) in their closed position during the forming process.
  3. Apparatus according to claim 1 or 2, characterized in that a pressure cushion (14) which can be subjected to a pressure medium is provided on the outer periphery (13) of each tool carrier (7a, 7b) of half shell form over or under the short stroke cylinder (9a, 9b).
  4. Apparatus according to claim 3, characterized in that each pressure cushion (14) is formed by an active area (16) on the periphery (13) of the tool carrier (7a, 7b) of half shell form surrounded by a seal fitted in a groove (15).
EP04016054A 2003-07-30 2004-07-08 Apparatus for making articles by internal high pressure forming Expired - Lifetime EP1502672B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10334660 2003-07-30
DE10334660A DE10334660B3 (en) 2003-07-30 2003-07-30 Device for producing molded parts comprises a housing formed by pipes which are connected together by shrinking, and a tool support unit consisting of half-shells and inserted into the hole of the inner pipe

Publications (3)

Publication Number Publication Date
EP1502672A1 EP1502672A1 (en) 2005-02-02
EP1502672B1 true EP1502672B1 (en) 2007-09-19
EP1502672B2 EP1502672B2 (en) 2012-03-28

Family

ID=33103697

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04016054A Expired - Lifetime EP1502672B2 (en) 2003-07-30 2004-07-08 Apparatus for making articles by internal high pressure forming

Country Status (4)

Country Link
US (1) US7080536B2 (en)
EP (1) EP1502672B2 (en)
AT (1) ATE373529T1 (en)
DE (2) DE10334660B3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006003981B4 (en) * 2006-01-27 2010-12-09 Theodor Gräbener GmbH & Co. KG Hydroforming press for the production of molded parts by hydroforming
EP2221126B1 (en) * 2009-02-20 2011-04-13 Theodor Gräbener GmbH & Co. KG Device for forming workpieces

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE122972C (en) *
US667525A (en) † 1900-06-08 1901-02-05 Carl Huber Internal-pressure-resistance cylinder.
US2962994A (en) * 1953-10-22 1960-12-06 Douglas Aircraft Co Inc High-pressure hydraulic press
GB791099A (en) † 1955-03-18 1958-02-26 Asea Ab High pressure cylinder
US3006306A (en) * 1956-02-07 1961-10-31 Gen Tire & Rubber Co Hydraulic press
US3120205A (en) * 1956-02-07 1964-02-04 Gen Tire & Rubber Co Forming pad for hydraulic press
US3224042A (en) † 1963-10-23 1965-12-21 Barogenics Inc Hydrostatic pressure device
US3379043A (en) † 1965-03-01 1968-04-23 Western Electric Co Pressure vessel for forming apparatus
US3545241A (en) * 1968-04-22 1970-12-08 Verson Allsteel Press Co Hydraulic press
US3661004A (en) * 1969-11-07 1972-05-09 Atlas Chem Ind Explosive tubing swager
SE392822B (en) * 1973-12-06 1977-04-25 Asea Ab HYDRAULIC PRESSURE WITH A PRESSURE CELL WITH AN ELASTIC MEMBRANE AND ONE MOLDED MILL CUSHION
US3971243A (en) * 1974-04-18 1976-07-27 The Boeing Company Method for die forming strip material
US3943741A (en) * 1975-03-25 1976-03-16 The United States Of America As Represented By The Secretary Of The Army Embossing method
GB1604495A (en) * 1978-05-30 1981-12-09 Hawkhead Bray & Sons Ltd Press action machines
SE450227B (en) * 1985-04-18 1987-06-15 Asea Ab PRESSURE OF CELL TYPE
SE512788C2 (en) † 1994-02-14 2000-05-15 Flow Holdings Gmbh Sagl Llc High pressure press and high pressure treatment procedure
DE69400231T2 (en) * 1994-07-15 1997-01-23 Verson Europa Sa Method and device for exchanging the membrane in a press with a pressure cell
DE19705244A1 (en) † 1997-02-12 1998-08-13 Huber & Bauer Gmbh Forming device
US6000271A (en) * 1998-11-06 1999-12-14 Ap Parts International, Inc. Metal forming apparatus and method of use
US6305204B1 (en) * 2000-07-13 2001-10-23 The Boeing Company Bulge forming machine
ES2240334T3 (en) † 2000-12-12 2005-10-16 Wobst, Stefan DEVICE AND PROCEDURE FOR CONFORMATION BY HIGH INTERNAL PRESSURE (IHU), AND CORRESPONDING USEFUL SYSTEM.

Also Published As

Publication number Publication date
ATE373529T1 (en) 2007-10-15
DE502004004998D1 (en) 2007-10-31
EP1502672B2 (en) 2012-03-28
US7080536B2 (en) 2006-07-25
DE10334660B3 (en) 2004-11-04
EP1502672A1 (en) 2005-02-02
US20050022576A1 (en) 2005-02-03

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