EP0940200B1 - Method and device for removing a slug from an internal high-pressure forming tool - Google Patents

Method and device for removing a slug from an internal high-pressure forming tool Download PDF

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Publication number
EP0940200B1
EP0940200B1 EP19990101944 EP99101944A EP0940200B1 EP 0940200 B1 EP0940200 B1 EP 0940200B1 EP 19990101944 EP19990101944 EP 19990101944 EP 99101944 A EP99101944 A EP 99101944A EP 0940200 B1 EP0940200 B1 EP 0940200B1
Authority
EP
European Patent Office
Prior art keywords
die
hole punch
tool
slug
removal tool
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
EP19990101944
Other languages
German (de)
French (fr)
Other versions
EP0940200A3 (en
EP0940200A2 (en
Inventor
Thomas Hülsberg
Ralf Pünjer
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.)
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler AG
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Filing date
Publication date
Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP0940200A2 publication Critical patent/EP0940200A2/en
Publication of EP0940200A3 publication Critical patent/EP0940200A3/en
Application granted granted Critical
Publication of EP0940200B1 publication Critical patent/EP0940200B1/en
Anticipated expiration legal-status Critical
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
    • B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
    • B21D45/003—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass in punching machines or punching tools
    • 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
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/28—Perforating, i.e. punching holes in tubes or other hollow bodies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49805—Shaping by direct application of fluent pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • Y10T83/0596—Cutting wall of hollow work

Definitions

  • the invention relates to a method for removing a slug from an internal high pressure forming tool according to the preamble of claim 1 and a device for performing of the method according to the preamble of the claim 8th.
  • a generic method or a generic device is known from US 5,398,533.
  • the device there includes an internal high pressure forming tool that runs along the extension of the hollow profile inserted into the engraving is.
  • On the underlying flat surface of the cross section trapezoidal engraving is arranged in the recess an insert for punching the hollow profile under high internal pressure is introduced.
  • the insert closes flush with the level Surface of the engraving and has an axial bore in the Stamp is performed.
  • the bore has at its mouth a ring-shaped cutting edge for engraving. The stamp closes the mouth opening during the shaping of the hollow profile the hole.
  • the stamp withdrawn relatively suddenly, after which under the influence of internal high pressure still prevailing and due to the lack of Support of the hollow profile by the stamp the hollow profile is pressed against the cutting edge of the hole, whereupon this is cut out a slug, which is further in the perforated channel formed by the hole is pressed. Then the fluid pressure is released and the stamp wieter lowered until the one on the face of the stamp Perforated slug at the level of the surroundings of the forming tool leading transverse channel to the hole-blanket channel, after which a removal tool designed as a slide the perforated slug out of the perforated slug channel through the transverse channel promoted to the outside.
  • the stamp is otherwise mechanical by moving a ramp across the stamp which he is slidably arranged, driven by lifting.
  • a disadvantage of the described embodiment of the perforated slug disposal, i.e. removal of the slug from the forming tool, is that they only occur when they are almost vertically down Perforations can be used, otherwise the hole-slug in the perforated channel of the use of the return movement cannot follow the stamp and therefore not from the slide can be conveyed out of the forming tool. In particular this concerns the execution of several perforations on the same Hollow profile in different circumferential areas. At a Release pressure only after reaching the height of the cross channel until then it falls to the face of the stamp due to internal high pressure pressed slugs from the stamp and on the underside the cutting edge of the insert.
  • the invention has for its object a generic To further develop a method and a generic device, that removing perforated slugs from the forming tool out of any position in the engraving of the Forming tool leading perforated slug channel in which the perforated slug after the perforation is initially recorded, in simpler Way becomes possible.
  • the task is according to the invention by the features of the claim 1 regarding the procedure and the characteristics of claim 8 solved with respect to the device.
  • the perforated slug can at any time i.e. both under the influence of high pressure as well in a relaxed state of the pressure fluid captive on the stamp are kept, the course and location of the perforated channel relative to the engraving of the forming tool for the It is completely irrelevant to hold the perforated slug on the stamp.
  • the adhesive property of the removal tool of the invention can that of the stamp pushed into the mold space and on its face still without falling off sticky slugs in the axial Push the removal tool into the mold space - no matter in the circumferential position of the slug - from the stamp detached and transferable to the removal tool, which then together with the slug from the forming tool is brought out.
  • the adhesive area of the removal tool can be arranged on all sides in the circumferential direction be, which causes the transition of the hole blank from the stamp on the removal tool after a simple axial movement can.
  • the slug can be adapted to the axial position of the stamp and thus the slug also several axially spaced Areas are provided, which are also on all sides in the circumferential direction act adherent.
  • the adhesive area can also on the other hand, be locally concentrated, so that if necessary after the axial insertion of the removal tool around its own body Axis must be rotated with its sticking area to face the slug.
  • FIG. 1 shows an internal high-pressure forming tool 1, in the mold space 2 enclosed by its engraving 10 Hollow profile 3 is inserted.
  • the forming tool 1 is along the Extension of the hollow profile 3 in an upper tool 4 and Lower tool 20 divided into two.
  • the upper tool 4 there is a perforated channel 5 formed in which a stamp 6 can be moved is guided and its diameter corresponds to that of the channel 5.
  • the stamp 6 closes flush with its end face 7 in FIG. 1 with the contour of the mold space 2.
  • a stamp runs in 6 axially continuous channel 8, the side facing away from the molding space 9 is connected to the suction side of a pump and in the Face 7 of the stamp 6 opens into the mold space 2.
  • Fig. 1 for producing a perforated This becomes hollow profile by applying an internal high pressure on all sides according to the direction of the arrow until it engages with the engraving 10 expanded.
  • the stamp is now under continued high pressure 6 withdrawn according to FIG. 2 in the perforated channel 5, whereby this is released.
  • This is due to the lack of support of the stamp 6 on the one hand and by the hydraulic internal high pressure on the other hand, the hollow profile 3 in the area of the mouth opening 11 of the perforated nozzle channel 5 out of the molding space 2 pressed into the channel 5, by pulling the Hollow profile material over the opening edge 12 of the mouth opening 11 a slug 13 from the hollow profile 3 from the inside to is sheared outside, which then up to the plant on the face of the stamp 7 pressed further into the perforated channel 5 becomes.
  • the slug 13 is thus from the area of the molding space 2 separated.
  • the opening edge 12 is advantageous to design as a cutting edge, so that the slug 13 clean from the hollow section 3rd is separated out.
  • the hollow section 3 is also conceivable Inward movement of the stamp 6 in the mold space 2 under counteracting High pressure to stamp a predetermined breaking point what continues to favor the separation of the slug 13 with an essentially smooth slug edge.
  • the pump is started, which causes over the channel 8 affects a suction pressure on the slug 13, the thereby adhering to the stamp face 7.
  • the suction pressure or of the hole 13 against the face 7 of the stamp 6 resulting negative pressure forms the adhesive of the stamp 6. It is beneficial to have the suction or vacuum before To build up the punching process so that the slug 13 is already one early date of the procedure on the stamp face 7 and thus a possible drop in pressure and escape of high pressure fluid avoided via the channel 8 of the stamp 6 becomes.
  • the vacuum supports the separation of the slug 13 on the side of the hollow profile facing away from the mold space 3rd
  • a removal tool designed as a rod is then used 14 for the slug 13 in the open mold space 2 introduced by means of a robot or manually. It can however, also the removal tool 14 first in the open mold space 2 are moved and only then the stamp 6 with the Perforated slugs 13 are inserted into the open mold space 2.
  • the Removal tool 14 has a central axial channel 15, from the radial transverse channels 16 (Fig. 5b).
  • the axial channel 15 is connected to the suction side of a pump, which is in operation in a similar way to the stamp 6 a suction pressure builds up.
  • the removal tool 14 is axially in the mold space 2 positioned that the area with the orifices 17 of the Cross channels 16 of the opening 11 of the perforated nozzle channel 5 in about opposite.
  • the removal tool 14 if necessary in addition to axial positioning, also around its body axis must be rotated until the mouth 17 of the Transverse channel 16 of the mouth opening 11 of the perforated nozzle channel 5 is opposite.
  • Several thin channels 16 have the advantage that the suction of the pump via the axial channel 15 is a relatively large circumferential area of the removal tool 14 extends and thus created a circumferentially extended detention area becomes. Furthermore, the thin channels 16 ensure good adhesion for the slug 13 because with this configuration the suction pressure becomes high and therefore a good suction effect is achieved.
  • training is one only channel with a large cross-sectional area 16 simple, but this configuration is less Has suction and only a limited effective adhesive surface, otherwise the slug 13 in the transverse channel 16 falls into it.
  • the pump now develops its suction power.
  • the with the stamp 6 connected pump can be switched off, so that the adhesive force on the stamp is eliminated and only the suction force acts on the slug 13 via the removal tool 14, which closes most of the orifices 17 and due to the negative pressure building up on its underside 18 adheres to the outside 19 of the removal tool 14.
  • the pump of the removal tool 14 a has greater suction than that of the stamp 6, so that the liability of the perforated slug 13 on the stamp 6 is lifted and this will become detached. Accordingly, this is from Removal tool 14 is tightened and remains on the tool 14 stick (Fig. 7a, b).
  • the stamp 6 and the removal tool 14 in rod form each form as an electromagnet. It is natural here mandatory that the hollow profile 3 and thus the perforated slug 13 made of a magnetic or magnetizable material consist. It is favorable for process security that Internal high-pressure forming tool 1 then from a non-magnetic Material exists.
  • the non-magnetic design of the Forming tool 1 can also be a shielding bushing in the perforated channel 5 be arranged, the force field of the stamp 6th keeps away from the surrounding magnetic forming tool 1.
  • the procedure with the electromagnet serving as an adhesive largely corresponds to that of the above and from the first embodiment shown in the figures, with the field of an electromagnet just as simple can be switched on like the pump for generating negative pressure.
  • the slug 13 is attracted by the electromagnetic stamp 6 and remains there until it is replaced by the stronger one magnetic field of the electromagnetic extraction tool 14 be liable. It is advantageous when using electromagnets that the removal tool 14 has no defined axial relative position to take punch 6 or slug 13, because the attraction acts over its entire axial extent and is not limited to mouth openings 17.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Cleaning In General (AREA)
  • Details Of Cutting Devices (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Adornments (AREA)

Abstract

A method and a device for removal of a slug separated from a hollow profile by means of a fluidic internal pressure from a hydroforming tool. The slug is separated from the hollow profile from the inside to the outside by the retraction of a plunger integrated into the hydroforming tool and clearing a slug channel when retracted, and is forced out of the die cavity of the hydroforming tool into the slug channel. Then, with the hollow profile in a zero-pressure state, the slug, which after it is pressed in abuts the end of the plunger, is removed by a removal tool from the hydroforming tool. In order to remove slugs from the hydroforming tool in any desired position of the slug channel that leads into the die of the hydroforming tool, in which the slug is initially received after perforation, in simple fashion, the slug is held at the end of the plunger during its stay in the slug channel by an adhesion means connected with the plunger. Then, after the hydroforming tool is opened and the finished hollow profile is removed, the slug, while continuing to adhere to the end of the plunger, is guided by means of the plunger and of the removal tool designed with adhesion means into the open die cavity. The slug and the area of the removal tool on which the adhesion means acts assume a relative position opposite one another, after which the slug is separated from the plunger and then adheres to the removal tool, by means of which the adhering slug is then removed from the hydroforming tool.

Description

Die Erfindung betrifft ein Verfahren zum Entfernen eines Lochbutzens aus einem Innenhochdruck-Umformwerkzeug gemäß dem Oberbegriff des Patentanspruches 1 und eine Vorrichtung zur Durchführung des Verfahrens nach dem Oberbegriff des Patentanspruches 8.The invention relates to a method for removing a slug from an internal high pressure forming tool according to the preamble of claim 1 and a device for performing of the method according to the preamble of the claim 8th.

Ein gattungsgemäßes Verfahren bzw. eine gattungsgemäße Vorrichtung ist aus der US 5,398,533 bekannt. Die dortige Vorrichtung beinhaltet ein Innenhochdruck-Umformwerkzeug, das längs der Erstreckung des in die Gravur eingelegten Hohlprofiles geteilt ist. An der untenliegenden ebenen Fläche der im Querschnitt trapezförmigen Gravur ist eine Aussparung angeordnet, in die ein Einsatz zum Lochen des Hohlprofiles unter Innenhochdruck eingebracht ist. Der Einsatz schließt bündig mit der ebenen Fläche der Gravur ab und weist eine axiale Bohrung, in der ein Stempel geführt ist. Die Bohrung besitzt an ihrer Ausmündung zur Gravur eine ringförmige Schneidkante. Der Stempel verschließt während der Umformung des Hohlprofil die Mündungsöffnung der Bohrung. Nach Abschluß der Umformung wird der Stempel relativ schlagartig zurückgezogen, wonach unter Einwirkung des noch herrschenden Innenhochdruckes und aufgrund der fehlenden Abstützung des Hohlprofiles durch den Stempel das Hohlprofil gegen die Schneidkante der Bohrung gedrückt wird, worauf aus diesem ein Lochbutzen herausgetrennt wird, der im weiteren in den von der Bohrung gebildeten Lochbutzenkanal gepreßt wird. Anschließend wird der Fluiddruck entspannt und der Stempel wieter abgesenkt, bis der an der Stempelstirnseite anliegende Lochbutzen auf der Höhe eines in die Umgebung des Umformwerkzeuges führenden Querkanales zum Lochbutzenkanal liegt, wonach ein als Schieber ausgebildetes Entnahmewerkzeug den Lochbutzen aus dem Lochbutzenkanal heraus durch den Querkanal hindurch nach außen befördert. Der Stempel wird im übrigen mechanisch durch quer zum Stempel erfolgendes Verfahren einer Rampe, auf der er gleitbeweglich angeordnet ist, hubbeweglich angetrieben. Nachteilig bei der beschriebenen Ausführung der Lochbutzenentsorgung, d.h. dem Entfernen des Lochbutzens aus dem Umformwerkzeug, ist, daß sie nur bei nahezu vertikal nach unten erfolgenden Lochungen angewendet werden kann, da anderenfalls der Loch-butzen im Lochbutzenkanal des Einsatzes der Rückführbewegung des Stempels nicht zu folgen vermag und somit nicht vom Schieber aus dem Umformwerkzeug hinausgefördert werden kann. Insbesondere betrifft dies das Ausführen mehrerer Lochungen am selben Hohlprofil in unterschiedlichen Umfangsbereichen. Bei einer Druckentspannung erst nach Erreichen der Höhe des Querkanals fällt der durch Innenhochdruck bis dahin an die Stempelstirnseite angepreßte Lochbutzen vom Stempel ab und auf die Unterseite der Schneidkante des Einsatzes zurück.A generic method or a generic device is known from US 5,398,533. The device there includes an internal high pressure forming tool that runs along the extension of the hollow profile inserted into the engraving is. On the underlying flat surface of the cross section trapezoidal engraving is arranged in the recess an insert for punching the hollow profile under high internal pressure is introduced. The insert closes flush with the level Surface of the engraving and has an axial bore in the Stamp is performed. The bore has at its mouth a ring-shaped cutting edge for engraving. The stamp closes the mouth opening during the shaping of the hollow profile the hole. After the forming is complete, the stamp withdrawn relatively suddenly, after which under the influence of internal high pressure still prevailing and due to the lack of Support of the hollow profile by the stamp the hollow profile is pressed against the cutting edge of the hole, whereupon this is cut out a slug, which is further in the perforated channel formed by the hole is pressed. Then the fluid pressure is released and the stamp wieter lowered until the one on the face of the stamp Perforated slug at the level of the surroundings of the forming tool leading transverse channel to the hole-blanket channel, after which a removal tool designed as a slide the perforated slug out of the perforated slug channel through the transverse channel promoted to the outside. The stamp is otherwise mechanical by moving a ramp across the stamp which he is slidably arranged, driven by lifting. A disadvantage of the described embodiment of the perforated slug disposal, i.e. removal of the slug from the forming tool, is that they only occur when they are almost vertically down Perforations can be used, otherwise the hole-slug in the perforated channel of the use of the return movement cannot follow the stamp and therefore not from the slide can be conveyed out of the forming tool. In particular this concerns the execution of several perforations on the same Hollow profile in different circumferential areas. At a Release pressure only after reaching the height of the cross channel until then it falls to the face of the stamp due to internal high pressure pressed slugs from the stamp and on the underside the cutting edge of the insert.

Der Erfindung liegt die Aufgabe zugrunde, ein gattungsgemäßes Verfahren bzw. eine gattungsgemäße Vorrichtung dahingehend weiterzubilden, daß ein Entfernen von Lochbutzen aus dem Umformwerkzeug heraus aus jeder beliebigen Lage des in die Gravur des Umformwerkzeuges führenden Lochbutzenkanals, in dem der Loch-butzen nach der Lochung vorerst aufgenommen ist, in einfacher Weise möglich wird.The invention has for its object a generic To further develop a method and a generic device, that removing perforated slugs from the forming tool out of any position in the engraving of the Forming tool leading perforated slug channel in which the perforated slug after the perforation is initially recorded, in simpler Way becomes possible.

Die Aufgabe ist erfindungsgemäß durch die Merkmale des Patentanspruches 1 hinsichtlich des Verfahrens und durch die Merkmale des Patentanspruches 8 hinsichtlich der Vorrichtung gelöst.The task is according to the invention by the features of the claim 1 regarding the procedure and the characteristics of claim 8 solved with respect to the device.

Aufgrund des Haftmittels am Stempel kann der Lochbutzen jederzeit, d.h. sowohl unter Einwirkung von Innenhochdruck als auch in entspanntem Zustand des Druckfluides verliersicher am Stempel gehalten werden, wobei der Verlauf und die Lage des Lochbutzenkanals relativ zur Gravur des Umformwerkzeuges für den Halt des Lochbutzens am Stempel völlig ohne Belang ist. Zur Entnahme des Lochbutzens ist es günstig, dies von Seiten des nach der Umformung geöffneten Formraums des Umformwerkzeuges bei entnommenem gelochten Hohlprofil zu tun, da bei mehreren Lochungen und somit mehreren anfallenden Lochbutzen im Gegensatz zu der bei dem bekannten Verfahren erforderlichen Verwendung von mehreren schieberartigen Entnahmewerkzeuge nur ein einziges Entnahmewerkzeug notwendig ist, um alle Lochbutzen aufzunehmen. Dies vereinfacht das Innenhochdruck-Umformwerkzeug ganz erheblich, da keine Aussparungen für die Schieber und ihre Antriebe vorgesehen werden müssen, die der Festigkeit des Umformwerkzeuges abträglich sind. Aufgrund der haftenden Eigenschaft des Entnahmewerkzeuges der Erfindung kann der vom Stempel in den Formraum hineingeschobene und an dessen Stirnseite weiterhin ohne abzufallen anhaftende Lochbutzen beim axialen Einschieben des Entnahmewerkzeuges in den Formraum - egal in welcher Umfangslage der Lochbutzen sich befindet - vom Stempel abgelöst und verliersicher auf das Entnahmewerkzeug übergehen, welches dann gemeinsam mit dem Lochbutzen aus dem Umformwerkzeug herausgeführt wird. Der haftend wirkende Bereich des Entnahmewerkzeuges kann dabei in Umfangsrichtung allseitig angeordnet sein, wodurch der Übergang des Lochbutzens vom Stempel auf das Entnahmewerkzeug nach einer einfachen Axialbewegung erfolgen kann. Es können in Anpassung an die Axiallage der Stempel und damit der Lochbutzen auch mehrere axial beabstandete Bereiche vorgesehen sein, die ebenfalls in Umfangsrichtung allseitig haftend wirken. Der haftende wirkende Bereich kann auch andererseits lokal konzentriert sein, so daß gegebenenfalls nach dem axialen Einführen das Entnahmewerkzeuges um seine körpereigene Achse gedreht werden muß, um mit seinem Haftbereich dem Lochbutzen gegenüberzuliegen. Insgesamt gesehen ist durch die Erfindung die Lochbutzenentsorgung in einfacher Weise automatisierbar.Due to the adhesive on the stamp, the perforated slug can at any time i.e. both under the influence of high pressure as well in a relaxed state of the pressure fluid captive on the stamp are kept, the course and location of the perforated channel relative to the engraving of the forming tool for the It is completely irrelevant to hold the perforated slug on the stamp. For Removing the slug, it is convenient to do this on the part of the after forming, open mold space of the forming tool to do with the perforated hollow profile removed, since with several In contrast, perforations and thus several resulting slugs to the use required in the known method only one of several slide-like removal tools only removal tool is necessary to remove all the slugs to record. This simplifies the hydroforming tool quite significant since there are no cutouts for the slider and their Drives must be provided that match the strength of the forming tool are detrimental. Because of the adhesive property of the removal tool of the invention can that of the stamp pushed into the mold space and on its face still without falling off sticky slugs in the axial Push the removal tool into the mold space - no matter in the circumferential position of the slug - from the stamp detached and transferable to the removal tool, which then together with the slug from the forming tool is brought out. The adhesive area of the removal tool can be arranged on all sides in the circumferential direction be, which causes the transition of the hole blank from the stamp on the removal tool after a simple axial movement can. It can be adapted to the axial position of the stamp and thus the slug also several axially spaced Areas are provided, which are also on all sides in the circumferential direction act adherent. The adhesive area can also on the other hand, be locally concentrated, so that if necessary after the axial insertion of the removal tool around its own body Axis must be rotated with its sticking area to face the slug. Overall seen through the invention can be automated in a simple manner.

Zweckmäßige Ausgestaltungen der Erfindung können den Unteransprüchen entnommen werden; im übrigen ist die Erfindung anhand zweier in den Zeichnungen dargestellter Ausführungsbeispiele nachfolgend näher erläutert; dabei zeigt:

  • Fig. 1 in einem Querschnitt einen Lochstempel der erfindungsgemäßen Vorrichtung im Umformwerkzeug bei der Umformung eines Hohlprofiles mittels Innenhochdruck,
  • Fig. 2 in einem Querschnitt das Umformwerkzeug aus Fig. 1 mit zum Lochen des umgeformten Hohlprofiles durch Zurückziehen des Stempels unter Innenhochdruck,
  • Fig. 3 in einem Querschnitt das Umformwerkzeug aus Fig. 1 in Öffnungsstellung mit am Stempel erfindungsgemäß anhaftendem Lochbutzen,
  • Fig. 4 in einem Querschnitt das Umformwerkzeug aus Fig. 1 in Öffnungsstellung und Lage des Stempels aus Fig. 3 nach Entnahme des Hohlprofiles,
  • Fig. 5a in einem seitlichen Längsschnitt das Umformwerkzeug aus Fig. 1 mit in den geöffneten Formraum eingeschobenen Entnahmewerkzeug der erfindungsgemäßen Vorrichtung,
  • Fig. 5b einen Querschnitt von Fig. 5a,
  • Fig. 6a in einem Querschnitt das Umformwerkzeug aus Fig. 5a,b mit in den Formraum hineinstehendem Stempel,
  • Fig. 6b einen seitlichen Längsschnitt von Fig. 6a,
  • Fig. 7a in einem Querschnitt das Umformwerkzeug aus Fig. 6a,b mit vom Stempel gelöstem und am Entnahmewerkzeug anhaftendem Lochbutzen,
  • Fig. 7b einen seitlichen Längsschnitt von Fig. 7a,
  • Fig. 8a in einem Querschnitt das Umformwerkzeug aus Fig. 7a,b mit in den Lochbutzenkanal des Umformwerkzeuges zurückgezogenem Stempel,
  • Fig. 8b einen seitlichen Längsschnitt von Fig. 8a.
    • Expedient embodiments of the invention can be found in the subclaims; otherwise, the invention is explained in more detail below with reference to two exemplary embodiments shown in the drawings; shows:
  • 1 in a cross section a punch of the device according to the invention in the forming tool during the forming of a hollow profile by means of internal high pressure,
  • 2 in a cross section the forming tool from FIG. 1 with for perforating the formed hollow profile by withdrawing the stamp under high internal pressure,
  • 3 in a cross-section the forming tool from FIG. 1 in the open position with the perforated slug adhering to the punch according to the invention,
  • 4 in a cross section the forming tool from FIG. 1 in the open position and position of the stamp from FIG. 3 after removal of the hollow profile,
  • 5a in a lateral longitudinal section the forming tool from FIG. 1 with the removal tool of the device according to the invention inserted into the opened mold space,
  • 5b shows a cross section of Fig. 5a,
  • 6a in a cross section the forming tool from FIG. 5a, b with the punch protruding into the molding space,
  • 6b is a side longitudinal section of Fig. 6a,
  • 7a in a cross section the forming tool from FIG. 6a, b with a perforated slug detached from the punch and adhering to the removal tool,
  • 7b is a lateral longitudinal section of FIG. 7a,
  • 8a in a cross section the forming tool from FIG. 7a, b with the plunger retracted into the perforated channel of the forming tool,
  • Fig. 8b is a side longitudinal section of Fig. 8a.

    • In Fig. 1 ist ein Innenhochdruck-Umformwerkzeug 1 dargestellt, in dessen von seiner Gravur 10 eingeschlossenen Formraum 2 ein Hohlprofil 3 eingelegt ist. Das Umformwerkzeug 1 ist längs der Erstreckung des Hohlprofiles 3 in ein Oberwerkzeug 4 und ein Unterwerkzeug 20 zweigeteilt. Im Oberwerkzeug 4 ist ein Lochbutzenkanal 5 ausgebildet, in dem ein Stempel 6 verschiebbar geführt ist und dessen Durchmesser dem des Kanals 5 entspricht. Der Stempel 6 schließt in Fig. 1 mit seiner Stirnseite 7 bündig mit der Kontur des Formraumes 2 ab. Im Stempel 6 verläuft ein axial durchgängiger Kanal 8, der auf formraumabgewandter Seite 9 mit der Saugseite einer Pumpe verbunden ist und der in der Stirnseite 7 des Stempels 6 in den Formraum 2 mündet. Im ersten Verfahrensschritt (Fig. 1) zur Herstellung eines gelochten Hohlprofiles wird dieses durch Anlegen eines Innenhochdruckes allseitig gemäß der Pfeilrichtung bis zur Anlage an der Gravur 10 aufgeweitet.1 shows an internal high-pressure forming tool 1, in the mold space 2 enclosed by its engraving 10 Hollow profile 3 is inserted. The forming tool 1 is along the Extension of the hollow profile 3 in an upper tool 4 and Lower tool 20 divided into two. In the upper tool 4 there is a perforated channel 5 formed in which a stamp 6 can be moved is guided and its diameter corresponds to that of the channel 5. The stamp 6 closes flush with its end face 7 in FIG. 1 with the contour of the mold space 2. A stamp runs in 6 axially continuous channel 8, the side facing away from the molding space 9 is connected to the suction side of a pump and in the Face 7 of the stamp 6 opens into the mold space 2. In the first Method step (Fig. 1) for producing a perforated This becomes hollow profile by applying an internal high pressure on all sides according to the direction of the arrow until it engages with the engraving 10 expanded.

    Unter weiterhin bestehendem Innenhochdruck wird nun der Stempel 6 gemäß Fig. 2 in den Lochbutzenkanal 5 zurückgezogen, wodurch dieser freigegeben wird. Dabei wird durch die fehlende Abstützung des Stempels 6 einerseits und durch den hydraulischen Innenhochdruck andererseits das Hohlprofil 3 im Bereich der Mündungsöffnung 11 des Lochbutzenkanals 5 aus dem Formraum 2 heraus in den Kanal 5 hineingepreßt, wobei durch das Ziehen des Hohlprofilmaterials über den Öffnungsrand 12 der Mündungsöffnung 11 ein Lochbutzen 13 aus dem Hohlprofil 3 von innen nach außen abgeschert wird, der dann bis zur Anlage an der Stempelstirnseite 7 weiter in den Lochbutzenkanal 5 hineingepreßt wird. Der Lochbutzen 13 ist somit vom dem Bereich des Formraumes 2 separiert. The stamp is now under continued high pressure 6 withdrawn according to FIG. 2 in the perforated channel 5, whereby this is released. This is due to the lack of support of the stamp 6 on the one hand and by the hydraulic internal high pressure on the other hand, the hollow profile 3 in the area of the mouth opening 11 of the perforated nozzle channel 5 out of the molding space 2 pressed into the channel 5, by pulling the Hollow profile material over the opening edge 12 of the mouth opening 11 a slug 13 from the hollow profile 3 from the inside to is sheared outside, which then up to the plant on the face of the stamp 7 pressed further into the perforated channel 5 becomes. The slug 13 is thus from the area of the molding space 2 separated.

    Es ist vorteilhaft, den Öffnungsrand 12 als Schneidkante auszubilden, so daß der Lochbutzen 13 sauber aus dem Hohlprofil 3 herausgetrennt wird. Denkbar ist auch das Hohlprofil 3 durch Einwärtsverfahren des Stempels 6 in den Formraum 2 unter gegenwirkendem Innenhochdruck eine Sollbruchstelle vorzuprägen, was sich weiterhin günstig auf das Heraustrennen des Lochbutzens 13 mit im wesentlichen glattem Butzenrand auswirkt.It is advantageous to design the opening edge 12 as a cutting edge, so that the slug 13 clean from the hollow section 3rd is separated out. The hollow section 3 is also conceivable Inward movement of the stamp 6 in the mold space 2 under counteracting High pressure to stamp a predetermined breaking point what continues to favor the separation of the slug 13 with an essentially smooth slug edge.

    Dannach wird die Pumpe in Betrieb gesetzt, wodurch sich über den Kanal 8 ein Saugdruck auf den Lochbutzen 13 auswirkt, der dadurch an der Stempelstirnseite 7 anhaftet. Der Saugdruck bzw. der bei Anlage des Lochbutzens 13 an der Stirnseite 7 des Stempels 6 entstehende Unterdruck bildet das Haftmittel des Stempels 6. Es ist günstig, den Saug- bzw. Unterdruck schon vor dem Lochvorgang aufzubauen, so daß der Lochbutzen 13 schon zu einem frühen Verfahrenszeitpunkt an der Stempelstirnseite 7 anliegt und somit ein etwaiger Druckabfall und Entweichen von Hochdruckflüssigkeit über den Kanal 8 des Stempels 6 vermieden wird. Gleichzeitig unterstützt der Unterdruck das Heraustrennen des Lochbutzens 13 auf formraumabgewandter Seite des Hohlprofiles 3.Then the pump is started, which causes over the channel 8 affects a suction pressure on the slug 13, the thereby adhering to the stamp face 7. The suction pressure or of the hole 13 against the face 7 of the stamp 6 resulting negative pressure forms the adhesive of the stamp 6. It is beneficial to have the suction or vacuum before To build up the punching process so that the slug 13 is already one early date of the procedure on the stamp face 7 and thus a possible drop in pressure and escape of high pressure fluid avoided via the channel 8 of the stamp 6 becomes. At the same time, the vacuum supports the separation of the slug 13 on the side of the hollow profile facing away from the mold space 3rd

    Schließlich kann nach Fig. 3 das Umformwerkzeug 1 nach Entspannung des Druckfluides geöffnet werden, wobei der Lochbutzen 13 aufgrund seiner saugbedingten Haftung am Stempel 6 nicht herunter in den geöffneten Formraum 2 fallen kann. Sodann wird das gelochte Hohlprofil 3 dem offenen Formraum 2 entnommen (Fig. 4).Finally, according to FIG. 3, the forming tool 1 after relaxation of the pressure fluid are opened, the perforated slug 13 due to its suction-related liability on the stamp 6 not down can fall into the open mold space 2. Then it will perforated hollow profile 3 removed from the open mold space 2 (Fig. 4).

    Anschließend wird gemäß Fig. 5a ein als Stab ausgebildetes Entnahmewerkzeug 14 für den Lochbutzen 13 in den offenen Formraum 2 mittels eines Roboters oder auch manuell eingeführt. Es kann jedoch auch das Entnahmewerkzeug 14 zuerst in den offenen Formraum 2 verfahren werden und erst dann der Stempel 6 mit dem Lochbutzen 13 in den offenen Formraum 2 eingeführt werden. Das Entnahmewerkzeug 14 weist einen zentralen Axialkanal 15 auf, von dem radiale Querkanäle 16 (Fig. 5b) abgehen. Der Axialkanal 15 ist mit der Saugseite einer Pumpe verbunden, welche im Betrieb in ähnlicher Weise wie beim Stempel 6 einen Saugdruck aufbaut. Das Entnahmewerkzeug 14 wird axial so im Formraum 2 positioniert, daß der Bereich mit den Mündungsöffnungen 17 der Querkanäle 16 der Mündungsöffnung 11 des Lochbutzenkanals 5 in etwa gegenüberliegen.5a, a removal tool designed as a rod is then used 14 for the slug 13 in the open mold space 2 introduced by means of a robot or manually. It can however, also the removal tool 14 first in the open mold space 2 are moved and only then the stamp 6 with the Perforated slugs 13 are inserted into the open mold space 2. The Removal tool 14 has a central axial channel 15, from the radial transverse channels 16 (Fig. 5b). The axial channel 15 is connected to the suction side of a pump, which is in operation in a similar way to the stamp 6 a suction pressure builds up. The removal tool 14 is axially in the mold space 2 positioned that the area with the orifices 17 of the Cross channels 16 of the opening 11 of the perforated nozzle channel 5 in about opposite.

    Es kann anstatt mehrerer auch nur ein radialer Querkanal 16 ausgebildet sein, wobei das Entnahmewerkzeug 14 gegebenenfalls zusätzlich zur axialen Positionierung auch noch um seine Körperachse gedreht werden muß, bis die Mündungsöffnung 17 des Querkanals 16 der Mündungsöffnung 11 des Lochbutzenkanals 5 gegenüberliegt. Mehrere dünne Kanäle 16 haben den Vorteil, daß die Ansaugung der Pumpe über den Axialkanal 15 sich über einen relativ großen Umfangsbereich des Entnahmewerkzeuges 14 erstreckt und somit ein umfangsmäßig ausgedehnter Haftbereich geschaffen wird. Des weiteren gewährleisten die dünnen Kanäle 16 eine gute Haftung für den Lochbutzen 13, da mit dieser Ausgestaltung der Saugdruck groß wird und damit eine gute Saugwirkung erreicht wird. Als Alternative ist die Ausbildung eines einzigen dafür mit großer Querschnittsfläche versehenen Kanals 16 einfach, wobei jedoch diese Ausgestaltung eine geringere Saugwirkung und nur ein begrenzte effektive Haftfläche aufweist, da bei letzterem sonst der Butzen 13 in den Querkanal 16 hineinfällt.Instead of several, only one radial transverse channel 16 can be used be formed, the removal tool 14 if necessary in addition to axial positioning, also around its body axis must be rotated until the mouth 17 of the Transverse channel 16 of the mouth opening 11 of the perforated nozzle channel 5 is opposite. Several thin channels 16 have the advantage that the suction of the pump via the axial channel 15 is a relatively large circumferential area of the removal tool 14 extends and thus created a circumferentially extended detention area becomes. Furthermore, the thin channels 16 ensure good adhesion for the slug 13 because with this configuration the suction pressure becomes high and therefore a good suction effect is achieved. As an alternative, training is one only channel with a large cross-sectional area 16 simple, but this configuration is less Has suction and only a limited effective adhesive surface, otherwise the slug 13 in the transverse channel 16 falls into it.

    Im Betrieb der Pumpe bildet somit der sich im Entnahmewerkzeug 14 aufbauende Unterdruck das Haftmittel des Entnahmewerkzeuges 14. Nach Einschalten der dem Entnahmewerkzeug zugeordneten Pumpe entsteht eine Saugwirkung über die Querkanäle 16 auf den sich im Lochbutzenkanal 5 befindlichen Lochbutzen 13. Es ist hierbei denkbar, daß die vom Entnahmewerkzeug 14 ausgehende Saugkraft gegenüber der Saugkraft der mit dem Stempel 6 verbundenen Pumpe so groß ist, daß der Lochbutzen 13 vom Stempel 6 weg abgelöst und aus dem Kanal 5 auf das Werkzeug 14 gezogen wird, wo er eine Anzahl von Mündungsöffnungen 17 der Querkanäle 16 abdeckt, welche Mündungsöffnungen 17 den Bereich aufspannen, der die Haftstelle des Lochbutzens 13 bildet. Die Haftwirkung des Entnahmewerkzeugs 14 auf den Lochbutzen 13 wird durch einen an der Haftstelle angreifenden Unterdruck erzeugt wird.When the pump is operating, it is thus formed in the removal tool 14 negative pressure builds up the adhesive of the removal tool 14. After switching on the pump assigned to the removal tool creates a suction effect on the cross channels 16 on the there are perforated slugs 13 located in the perforated channel 5 conceivable here that the outgoing from the removal tool 14 Suction power versus the suction power of the stamp 6 connected Pump is so large that the slug 13 from the punch 6 detached away and drawn from the channel 5 onto the tool 14 is where he has a number of orifices 17 of the transverse channels 16 covers which orifices 17 span the area, which forms the point of detention of the slug 13. The adhesive effect of the removal tool 14 on the perforated slug 13 is by a negative pressure attacking at the detention point is generated.

    Dieser Ablösevorgang kann durch Abschalten der Stempelpumpe beschleunigt werden, wodurch die Leistung der Pumpe des Entnahmewerkzeuges 14 nicht sonderlich hoch zu sein braucht. Trotzdem besteht die Möglichkeit, daß sich der Lochbutzen 13 im Lochbutzenkanal 5 beim Ablösen vom Stempel 6 verklemmt. Um dieser Prozeßunsicherheit abzuhelfen, wird, bevor die Pumpe des Entnahmewerkzeuges 14 ihre Wirkung zeigt, der Stempel 6 mitsamt dem noch an ihm haftenden Lochbutzen 13 aus dem Lochbutzenkanal 5 heraus in den Formraum 2 hineinverfahren, so daß ein Verklemmen beim Ablösen des Lochbutzens 13 von der Stempelstirnseite 7 nicht mehr möglich ist und nur noch ein geringer Abstand zum Entnahmewerkzeug 14 besteht (Fig. 6a,b). Durch die Verringerung des Abstandes kann die zur Ablösung aufzubringende Saugkraft der Entnahmewerkzeugpumpe reduziert werden ohne an ablösender und anhaftender Wirkung zu verlieren.This detachment process can be accelerated by switching off the stamp pump be, which reduces the performance of the pump of the removal tool 14 need not be particularly high. Nevertheless there is the possibility that the slug 13 in the slug channel 5 jammed when detaching from the stamp 6. This process uncertainty remedy, before the pump of the removal tool 14 shows its effect, the stamp 6 together with the perforated slug 13 still adhering to it from the perforated slug channel 5 move out into the mold space 2, so that jamming when detaching the slug 13 from the stamp face 7 is no longer possible and only a short distance from Removal tool 14 is (Fig. 6a, b). By reducing of the distance can be the suction force to be applied the removal tool pump can be reduced without detaching and losing adhesive effect.

    Die Pumpe entfaltet nun ihre Saugkraft. Gleichzeitig kann die mit dem Stempel 6 verbundene Pumpe abgeschaltet werden, so daß die Haftkraft am Stempel aufgeboben ist und allein die Saugkraft auf den Lochbutzen 13 über das Entnahmewerkzeug 14 wirkt, welcher die meisten der Mündungsöffnungen 17 verschließt und durch den sich an seiner Unterseite 18 aufbauenden Unterdruck an der Außenseite 19 des Entnahmewerkzeuges 14 anhaftet. Gleichfalls ist natürlich auch denkbar, daß beide Pumpen im Betrieb bleiben, wobei die Pumpe des Entnahmewerkzeuges 14 eine größere Saugkraft aufweist als die des Stempels 6, so daß dadurch die Haftung des Lochbutzens 13 am Stempel 6 aufgehoben wird und sich dieser somit ablöst. Entsprechend wird dieser vom Entnahmewerkzeug 14 angezogen und bleibt an dem Werkzeug 14 haften (Fig. 7a,b).The pump now develops its suction power. At the same time, the with the stamp 6 connected pump can be switched off, so that the adhesive force on the stamp is eliminated and only the suction force acts on the slug 13 via the removal tool 14, which closes most of the orifices 17 and due to the negative pressure building up on its underside 18 adheres to the outside 19 of the removal tool 14. Likewise, it is of course also conceivable that both pumps are in operation remain, the pump of the removal tool 14 a has greater suction than that of the stamp 6, so that the liability of the perforated slug 13 on the stamp 6 is lifted and this will become detached. Accordingly, this is from Removal tool 14 is tightened and remains on the tool 14 stick (Fig. 7a, b).

    Um das Entnahmewerkzeug 14 behinderungsfrei aus dem Formraum 2 mit dem anhaftenden Lochbutzen 13 herauszuführen und diesen somit aus dem Umformwerkzeug 1 zu entfernen, wird abschließend gemäß Fig. 8a,b der Stempel 6 aus dem Formraum 2 heraus in eine im Lochbutzenkanal 5 zurückversetzte Position hineinverfahren.Around the removal tool 14 from the molding space 2 without hindrance to lead out with the adhering slug 13 and thus this To remove from the forming tool 1 is final 8a, b, the stamp 6 out of the molding space 2 into a Move back into the recessed position in position 5.

    Als Alternative zu den auf einem Saug- bzw. Unterdruck fußenden Haftmitteln des Stempels 6 und des Entnahmewerkzeuges 14 ist es denkbar, den Stempel 6 und das Entnahmewerkzeug 14 in Stabform jeweils als Elektromagnet auszubilden. Hierbei ist es natürlich zwingend erforderlich, daß das Hohlprofil 3 und damit der Lochbutzen 13 aus einem magnetischen oder magnetisierbaren Material bestehen. Es ist dabei zur Prozeßsicherheit günstig, daß das Innenhochdruck-Umformwerkzeug 1 dann aus einem unmagnetischen Werkstoff besteht. Anstatt der unmagnetischen Ausgestaltung des Umformwerkzeuges 1 kann auch im Lochbutzenkanal 5 eine Abschirmbuchse angeordnet sein, die das Kraftfeld des Stempels 6 vom umgebenden magnetischen Umformwerkzeug 1 fernhält.As an alternative to those based on suction or vacuum Adhesives of the stamp 6 and the removal tool 14 are conceivable, the stamp 6 and the removal tool 14 in rod form each form as an electromagnet. It is natural here mandatory that the hollow profile 3 and thus the perforated slug 13 made of a magnetic or magnetizable material consist. It is favorable for process security that Internal high-pressure forming tool 1 then from a non-magnetic Material exists. Instead of the non-magnetic design of the Forming tool 1 can also be a shielding bushing in the perforated channel 5 be arranged, the force field of the stamp 6th keeps away from the surrounding magnetic forming tool 1.

    Der Verfahrensablauf mit den als Haftmittel dienenden Elektromagneten entspricht weitestgehend dem des oben genannten und aus den Figuren zu entnehmenden ersten Ausführungsbeispiels, wobei das Feld eines Elektromagneten ebenso einfach aus- oder zugeschaltet werden kann wie die Pumpe zur Unterdruckerzeugung. Der Lochbutzen 13 wird vom elektromagnetischen Stempel 6 angezogen und bleibt dort bis zu seiner Ablösung durch das stärkere magnetische Feld des elektromagnetischen Entnahmewerkzeuges 14 haften. Vorteilig ist bei der Verwendung von Elektromagneten, daß das Entnahmewerkzeug 14 keine definierte axiale Relativlage zum Stempel 6 bzw. Lochbutzen 13 einnehmen muß, da die Anziehungskraft über seine gesamte axiale Erstreckung wirkt und nicht auf Mündungsöffnungen 17 beschränkt ist.The procedure with the electromagnet serving as an adhesive largely corresponds to that of the above and from the first embodiment shown in the figures, with the field of an electromagnet just as simple can be switched on like the pump for generating negative pressure. The slug 13 is attracted by the electromagnetic stamp 6 and remains there until it is replaced by the stronger one magnetic field of the electromagnetic extraction tool 14 be liable. It is advantageous when using electromagnets that the removal tool 14 has no defined axial relative position to take punch 6 or slug 13, because the attraction acts over its entire axial extent and is not limited to mouth openings 17.

    Claims (13)

    1. A process for the removal of a hole punch (13) separated from a hollow section (3) by means of a fluid internal high pressure from an internal high pressure forming tool (11) with the hole punch (13) being separated from the inside out in relation to the hollow section (3) by drawing back a die (6) integrated in the forming tool (1) which opens up a hole punch channel (5) when drawn back and being pressed out of the forming space of the forming tool (1) into the hole punch channel (5) and, when the hollow section (3) is not under pressure, the hole punch (15) which lies adjacent to the front (7) of the die (6) after it has been pressed in being removed from the forming tool (1) by means of a removal tool (14),
      characterised in that
      the hole punch (13) is held against the front (7) of the die (6) during its time in the hole punch channel (5) by attaching means connected to the die (6) and that once the forming tool (1) has been opened and the formed hollow section (3) has been removed, while remaining attached to the front (7) of the die (6) by means of the die (6) the hole punch (13) and the removal tool (14) which is designed with attaching means are inserted into the open forming space (2), with the hole punch (13) and the area of the removal tool (14) in which the attaching means operate taking up positions opposite one another, after which the hole punch (13) is detached from the die (6) and then attached to the removal tool (14) by means of which the attached hole punch (13) is then retracted from the forming tool (1).
    2. A process according to Claim 1,
      characterised in that
      the hole punch (13) which is initially attached to the die (6) is attracted by the removal tool (14) with a force of attraction stronger than the attachment between the hole punch (13) and the die (6), thereby detaching the hole punch (13) from the die (6) and then attaching it to the removal tool (14).
    3. A process according to Claim 2,
      characterised in that
      after the positioning of the die (6) in the forming space (2), the attaching force of the attaching means on the die working on the hole punch (13) is removed and the attaching force of the removal tool (14) is simultaneously built up.
    4. A process according to Claim 1,
      characterised in that
      the hole punch (13) is attracted by an under-pressure created by the die (6) which forms the attaching means and this under-pressure holds the hole punch (13) against the die (6) until it is released.
    5. A process according to Claim 1,
      characterised in that
      in the case of a hole punch (13) consisting of a magnetic material the hole punch (13) is attracted by an electromagnet working as attaching means via the die (6) by means of which the hole punch (13) is held against the die (6) until it is released.
    6. A process according to Claim 1,
      characterised in that
      the attaching effect of the removal tool (14) is generated electromagnetically.
    7. A process according to Claim 1,
      characterised in that
      the attaching effect of the removal tool (14) is generated by means of an under-pressure which attaches to the subsequent point of attachment of the hole punch (13).
    8. A device for the removal of a hole punch (13) separated from a hollow section (3) by means of a fluid internal high pressure from an internal high pressure forming tool (1) which is divided along the length of the hollow section (3), with a die (6) which is integrated in the forming tool (1) and which can be slid along a hole punch channel (5) in said die with the hole punch (13) which is separated outward by drawing back the die (6) from the hollow section (3) by means of the internal high pressure lying adjacent to the front (7) of the die (6) and with a removal tool (14) to remove the hole punch (13) which lies adjacent to the die (6) from the forming tool (1) when the hollow section (3) is not under pressure to perform the process as described in Claim 1,
      characterised in that
      the die (6) is connected to attaching means by means of which the hole punch (13) is held against the front (7) of the die (6), that the die (6) extends into the open forming space (2) of the open forming tool (1) once it has finished its forming work and is free of hollow section and that the removal tool (14) can be inserted into the open forming space (2) and has attaching means by means of which the hole punch (13) can be received in the removal tool (14) in such a way that it cannot be lost when the removal tool (14) is in a position in the open forming space opposite the front (7) of the inserted die (6).
    9. A device according to Claim 8,
      characterised in that
      the removal tool (14) is designed as a rod which has a central axial channel (15) from which at least one radial transverse channel (16) branches off, with the mouth opening (17) of the transverse channel (16) lying opposite the front (7) of the die when the removal tool (14) is in the use position in the open forming space (2) and that the axial channel (15) is connected to the intake side of the pump with the under-pressure building up in the removal tool (14) forms the attaching means for the removal tool (14) when the pump is in operation.
    10. A device according to Claim 8,
      characterised in that
      in the case of a magnetic hollow section material the removal tool (14) is designed as a rod-shaped electromagnet and that the internal high pressure forming tool (1) consists of a non-magnetic material.
    11. A device according to Claim 8,
      characterised in that
      an axially traversible channel (8) is positioned in the die (6) and that the end of the die (6) facing away from the forming space is connected to the intake side of a pump whereby the suction or under-pressure created when the pump is in operation forms attaching means for the die (6).
    12. A device according to Claim 8,
      characterised in that
      in the case of a magnetic hollow section material the die (6) is designed as an electromagnet and that the internal high pressure forming tool (1) consists of a non-magnetic material.
    13. A device according to Claim 8,
      characterised in that
      in the case of a magnetic hollow section material the die (6) is designed as an electromagnet with its field of force shielded against the surrounding forming tool (1).
    EP19990101944 1998-03-05 1999-01-30 Method and device for removing a slug from an internal high-pressure forming tool Expired - Lifetime EP0940200B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19809519 1998-03-05
    DE19809519A DE19809519C1 (en) 1998-03-05 1998-03-05 Method of removal of core from pressure molded hollow workpiece

    Publications (3)

    Publication Number Publication Date
    EP0940200A2 EP0940200A2 (en) 1999-09-08
    EP0940200A3 EP0940200A3 (en) 2000-05-03
    EP0940200B1 true EP0940200B1 (en) 2001-08-22

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    ID=7859862

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP19990101944 Expired - Lifetime EP0940200B1 (en) 1998-03-05 1999-01-30 Method and device for removing a slug from an internal high-pressure forming tool

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    Country Link
    US (1) US6006566A (en)
    EP (1) EP0940200B1 (en)
    AT (1) ATE204520T1 (en)
    CA (1) CA2264491A1 (en)
    DE (2) DE19809519C1 (en)
    ES (1) ES2162711T3 (en)

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    US5816089A (en) * 1996-11-26 1998-10-06 Dana Corporation Hydroforming apparatus having in-die hole piercing capabilities and a slug ejection system using hydroforming fluid

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    DE59900203D1 (en) 2001-09-27
    ATE204520T1 (en) 2001-09-15
    US6006566A (en) 1999-12-28
    CA2264491A1 (en) 1999-09-05
    ES2162711T3 (en) 2002-01-01
    DE19809519C1 (en) 1999-07-01
    EP0940200A3 (en) 2000-05-03
    EP0940200A2 (en) 1999-09-08

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