WO2006099853A1 - Dispositif et procede pour separer ou perforer une piece realisee au moyen d'un procede de deformation a pression interne elevee - Google Patents

Dispositif et procede pour separer ou perforer une piece realisee au moyen d'un procede de deformation a pression interne elevee Download PDF

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Publication number
WO2006099853A1
WO2006099853A1 PCT/DE2006/000504 DE2006000504W WO2006099853A1 WO 2006099853 A1 WO2006099853 A1 WO 2006099853A1 DE 2006000504 W DE2006000504 W DE 2006000504W WO 2006099853 A1 WO2006099853 A1 WO 2006099853A1
Authority
WO
WIPO (PCT)
Prior art keywords
workpiece
pressure
membrane
hydroforming
pressure medium
Prior art date
Application number
PCT/DE2006/000504
Other languages
German (de)
English (en)
Other versions
WO2006099853A8 (fr
Inventor
Markan Lovric
Günther MESSMER
Original Assignee
Forschungsgesellschaft Umformtechnik Mbh
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
Application filed by Forschungsgesellschaft Umformtechnik Mbh filed Critical Forschungsgesellschaft Umformtechnik Mbh
Publication of WO2006099853A1 publication Critical patent/WO2006099853A1/fr
Publication of WO2006099853A8 publication Critical patent/WO2006099853A8/fr

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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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/10—Stamping using yieldable or resilient pads
    • B21D22/12—Stamping using yieldable or resilient pads using enclosed flexible chambers
    • B21D22/125—Stamping using yieldable or resilient pads using enclosed flexible chambers of tubular products
    • 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
    • B21D26/035—Deforming tubular bodies including an additional treatment performed by fluid pressure, e.g. perforating
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D21/00—Machines or devices for shearing or cutting tubes
    • B23D21/006—Machines or devices for shearing or cutting tubes and sealing, crushing or chamfering the tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D21/00—Machines or devices for shearing or cutting tubes
    • B23D21/14—Machines or devices for shearing or cutting tubes cutting inside the tube

Definitions

  • the invention relates to an apparatus and a method for separating or punching a workpiece produced by the hydroforming process according to the preamble of the 1st, 9th, 10th, 11th, 12th or 13th claim.
  • Hydroforming is based on molding a blank, e.g. a tube to insert into a tool to seal the blank on both sides and to apply such pressure with internal pressure that the blank engages the tool engraving and so assumes their shape contour.
  • DE 40 35 625 A1 describes a method for producing an opening in the wall of a workpiece designed as a hollow body and a tool for carrying out the method, wherein the tool is provided in the region of the desired breakthrough with a sharp-edged weg undedem from the workpiece wall cavity. The wall is then pressurized in the direction of this cavity such that it intersects the sharp edge.
  • a guided in the hydroforming die punch is first performed for the purpose of precutting against the stationary wall under maximum internal pressure and then for the purpose of complete cutting against the wall under reduced pressure.
  • the cut remainder arrives in the pressure chamber, from which it must be pushed out again by the breakthrough achieved.
  • gem. DE 195 06 067 C1 first generates a predetermined breaking point with a punch in the wall and then releases a circumferential cutting edge by the punch on the tool, at which the wall finally separates under the influence of the increasing internal high pressure.
  • DE 199 35 714 A1 describes a device and a method for separating or punching a workpiece, wherein a freely engageable or executable elastic bladder body is arranged in the interior of the workpiece, which applies to the workpiece wall during insertion or compression of the printing medium.
  • the hydroforming forming tool is constructed axially from two tool halves, between which a connecting ring is located, the inner contour of which is circumferentially larger at least by the wall thickness of the workpiece than the inner contour of the tool halves.
  • the lower mold half is provided with a cutting edge at the end adjacent to the connecting ring.
  • the corresponding end transition of the upper mold half is soft.
  • the bladder having a bottom is already outside of the likewise formed with a bottom before the forming process Tool introduced into the workpiece. Upon introduction of a pressure medium in the workpiece, this applies to the inner contour of the tool and thereby receives the desired shape. Upon further increase of the pressure, a further widening of the workpiece takes place in the region of the cutting edge, since the inner contour of the connecting ring is arranged to lead away radially outward. At this cutting edge, the separation of the workpiece takes place after a predetermined parting line.
  • the bladder located in the workpiece prevents leakage of the pressure medium through the cut opening of the workpiece, whereby a complete cut can be performed.
  • a pressure drop occurs and thus the cut can not be completed.
  • the connecting ring to be integrated into the tool, the structure of the device is relatively complicated.
  • only one cutting edge is arranged, whereby only a single cut is possible. This, in turn, limits the use of this device.
  • the object of the invention is to provide a cost-effective, easy-to-use device and an equally inexpensive method for separating or punching a workpiece produced by the hydroforming process, with high process reliability targeted pressurization of the workpiece in the region of the cutting edges and takes place Cutting or punching the workpiece at several points in a single operation is possible.
  • the elastic membrane arranged at least in the area of the cutting edge in the workpiece can be acted upon by a pressure required for the separation or perforation, while a pressure required for hydroforming is applied outside the membrane.
  • At least two separate pressure medium supply lines are provided for the supply of the pressure medium, the one pressure medium supply being connected to a pressure chamber which can be built up within the membrane and the other pressure medium supply being connected to a pressure space present outside the membrane but inside the workpiece.
  • the pressure generated in the pressure space present in the membrane is greater by a certain amount than the pressure generated in the pressure space of the workpiece.
  • the pressure medium supply lines are preferably arranged in a sealing element sealingly sealing at least one end face of the workpiece.
  • the elastic membrane may be balloon-shaped expandable and be attached to the opening side of the projecting into the workpiece sealing element.
  • the elastic membrane may also have two openings and be secured in the form of a sleeve on the sealing element projecting into the workpiece.
  • the pressure medium can be supplied to the pressure chambers of the workpiece and the membrane by means of a differential pressure valve.
  • a balloon-shaped expandable elastic membrane can furthermore be arranged in the workpiece, which is fastened on the opening side to a sealing element sealingly sealing at least one end face of the workpiece and via the pressure medium supply both with a pressure required for hydroforming and with a pressure required for separating or punching Pressure can be applied.
  • a hose-shaped elastic membrane can be arranged in the workpiece, which is closed at the end faces of the workpiece by sealing elements and can be acted upon by the pressure medium supply both with a pressure required for hydroforming and with a pressure required for the separation or punching.
  • the elastic membrane may be annular and arranged at least in the region of the cutting edge on the inside of the workpiece.
  • the membrane can also be formed by an elastic layer which can be applied over the entire surface or partially to the inside of the workpiece, wherein the membrane can be acted upon by the pressure medium supply both with a pressure required for hydroforming and with a pressure required for the separation or punching is.
  • the elastic membrane arranged at least in the region of the cutting edge in the workpiece is subjected to a pressure required for the separation or punching, while a pressure required for hydroforming takes place outside the membrane.
  • the membrane is first attached outside of the forming tool to a sealing element. Then the sealing element with the membrane is sealingly introduced into the workpiece. Thereafter, pressure medium is introduced into the pressure chambers of the workpiece and the membrane via the arranged in the sealing element pressure medium supply lines.
  • the pressure necessary for hydroforming is first generated in both pressure chambers, and then in the pressure space of the membrane the pressure required for the separation or punching is generated, while the pressure in the pressure chamber of the workpiece is increased to a pressure below that for the separation or punching required pressure is.
  • FIG. 1 Arrangement of a balloon-shaped membrane in a workpiece before the hydroforming and separation
  • FIG. 2 Arrangement of the membrane in a workpiece according to FIG
  • Fig. 4 Arrangement of the membrane in a workpiece according to Fig. 3 after the hydroforming and separating
  • Fig. 5 Arrangement of two membranes within a workpiece at
  • Fig. 7 Arrangement of a balloon-shaped membrane in a workpiece with only one pressure medium supply
  • Fig. 8 Arrangement of a tubular membrane in a workpiece with only one pressure medium supply
  • Fig. 9 Arrangement of annular membranes in a workpiece
  • the apparatus for separating or perforating a tubular workpiece 1 produced by the hydroforming process has a forming tool 2 which is known per se Way consists of a tool shell 2.1 and a tool lower part 2.2.
  • the wall of the workpiece 1 has an inner side 1.1 and an outer side 1.2 facing the tool upper part 2.1 or the lower tool part 2.2.
  • At least one end face of the workpiece 1 bears against a sealing element 3, which seals the workpiece 1 in the axial direction.
  • two pressure medium supply lines 4 and 4.1 are arranged within the sealing element 3.
  • a pressure medium can be conducted into the workpiece 1 and via the second pressure medium supply 4.1 into a membrane M arranged within the workpiece 1.
  • a pressure medium receiving pressure chamber 5 located in the workpiece 1, a pressure medium receiving pressure chamber 5, while in the membrane M, a pressure chamber 5.1 builds up.
  • the outer side 1.2 of the workpiece 1 facing side of the upper tool part 2.1 and the lower tool part 2.2 a circumferential over the entire circumference of the workpiece 1 groove 6 is introduced.
  • at least one of the edges of the groove 6 directed in the direction of the outer side 1.2 of the workpiece 1 is designed as a cutting edge 6.1.
  • a membrane M which can be expanded in a balloon-like manner within the workpiece 1 is shown, which is slipped over an axial plunger 3.1 of the sealing element 3 projecting into the tubular workpiece 1.
  • the membrane M is on the opening side preferably detachable and thus quickly replaceable attached to the circumference of the axial plunger 3.1.
  • the leading into the pressure chamber 5.1 of the diaphragm M pressure medium supply 4.1 is here centrally in the axial plunger 3.1 of the sealing element 3 is arranged.
  • the introduction of the pressure medium in the pressure chamber 5 of the workpiece 1 serving pressure medium supply 4 is located off-center in the recessed portion of the sealing element.
  • a membrane M which has openings at both end faces. It is cuff-shaped attached to the circumference of the projecting, projecting into the workpiece 1 Axial tappet 3.1 of the sealing element 3, but without enclosing its workpiece-side end face.
  • the membrane M is secured to its opening facing away from the interior of the workpiece 1 on the recessed portion of the sealing element 3, while it is attached to its protruding into the interior of the workpiece 1 open end on the circumference of the axial plunger 3.1.
  • the entire interior of the workpiece 1 with a larger number of associated cutting edges 6.1 could thus be covered by the membrane M.
  • the supply of the pressure medium in the two separate pressure chambers 5, 5.1 can be done for example by means of a differential pressure valve V.
  • FIG. 1 and in FIG. 3 in each case the state of the workpiece 1 before the hydroforming and before the separation is shown, while FIG. 2, FIG. 4 and FIG. 5 already show the state after the separation.
  • FIG. 6 shows in detail the interface after disconnection.
  • the mode of action is the following:
  • Pressure chamber 5 of the workpiece 1 as well as in the pressure chamber 5.1 of the membrane M is initiated, whereby in both pressure chambers 5, 5.1 one of the forming serving pressure Pi builds up.
  • the workpiece 1 is pressed with its outer side 1.2 to a not shown here engraving of the forming tool 2.
  • the elastic membrane M becomes pressed by the pressure built up in their pressure chamber 5.1 p ⁇ against the inside 1.1 of the workpiece 1, whereby the outside 1.2 abuts the groove 6 with the cutting edge 6.1.
  • the pressure p ⁇ within the pressure chamber 5.1 of the membrane M is further increased.
  • the pressure p s building up in the pressure chamber 5.1 of the membrane M, required for the separation or perforation, is thereby greater by a difference ⁇ p than the pressure p 1 in the pressure chamber 5 of the workpiece 1, which serves for the hydrofluorocarbon, which is possibly still somewhat is increased to a pressure slightly below the pressure p s , to counteract the risk of bursting of the membrane M.
  • the elastic membrane M is now pressed even stronger against the inside 1.1 of the workpiece 1.
  • the outer side 1.2 of the workpiece 1 is thereby pressed against the cutting edge 6.1 of the groove 6, that upon reaching a corresponding pressure p s is a cut.
  • the workpiece 1 is separated along the radial circumferential parting line. It is completely irrelevant whether a uniform or non-uniform sheet thickness s of the workpiece wall is present or how the material of the workpiece 1 is provided. Due to the pressure chamber 5.1 located within the elastic membrane M, the pressure p s built up there remains intact, even if a premature cut in the workpiece 1 should take place at one point of the parting line.
  • the dimensions of the groove 6 are determined here in dependence on the sheet thickness s of the workpiece 1 and the membrane thickness d, the nature of the workpiece material and the required amount of pressure p s . It is important to ensure that the groove depth t is smaller than or at most equal to the sum of plate thickness s and membrane thickness d, to prevent the risk of injury to the membrane M during the separation or perforation process.
  • the groove depth t is about 0.2 times greater than the plate thickness s.
  • the separation of the workpiece 1 is preferably shown along a relatively simple parting line.
  • FIGS. 7, 8 and 9 exemplary embodiments are shown which have only one pressure medium supply 4, as a result of which the expenditure on equipment is lower.
  • two elastic membranes M each provided with an opening are attached to a respective sealing element 3, which closes the tubular workpiece 1 on the face side.
  • a respective sealing element 3 which closes the tubular workpiece 1 on the face side.
  • the mode of action is the same for each membrane M.
  • pressure medium is introduced into the membrane M, in which a pressure chamber 5.1 with a pressure pi required for the hydrofluoric acid is built up.
  • the membrane M is thereby expanded balloon-shaped and pressed analogously to the embodiments described above to the inside 1.1 of the workpiece 1.
  • the pressure required for the separation or punching p s is also applied via the pressure medium supply 4 in the pressure chamber 5.1.
  • the membrane M is further pressed against the inside 1.1 of the workpiece 1, whereby it comes to the section in the region of the cutting edge 6.1, which runs along the predetermined parting line.
  • the membranes M are applied to the entire inner side 1.1 of the workpiece 1. For smaller workpieces 1 or the arrangement of only one membrane M can be sufficient.
  • a preferably tubular elastic membrane M which is open at its two end sides, is arranged within the tubular workpiece 1 in such a way that a pressure chamber 5.1 builds up in the workpiece 1 when a pressure medium is supplied via the pressure medium supply 4
  • the membrane M surrounds the outer shell. At the two end faces, the membrane M and thus the pressure chamber 5.1 is closed by sealing elements 3.
  • the mode of action is analogous to the embodiment described above with the balloon-shaped membrane M. This means that in the pressure chamber 5.1, both a pressure p 1 required for the hydroforming and a pressure p s required for the separation or perforation builds up.
  • FIG. 8 the state of the workpiece 1 after the hydroforming and before the separation is shown.
  • the membrane M is annular. This makes it possible to arrange them only in the region of the cutting edges 6.1 in the workpiece 1.
  • the membrane M is formed by an elastic layer which is applied over the entire surface or partially on the inside 1.1 of the workpiece 1, wherein the membrane M also via the pressure medium supply 4 with both a pressure required for the hydroforming p ⁇ as Also with a required for the separation or punching pressure p s can be acted upon.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

Selon l'invention, une pression (Ps) nécessaire à la séparation ou à la perforation, peut être appliquée à la membrane élastique (M) qui se trouve dans la pièce (1) au moins au niveau de l'arête coupante (6.1), alors qu'une pression (Pi) nécessaire à la déformation à pression interne élevée, est appliquée à l'extérieur de la membrane (M). A cet effet, l'invention fait intervenir deux systèmes d'apport d'agent pressurisé séparés (4) et (4.1), et deux chambres de pression (5) et (5.1). De plus, les deux pressions (Pi) et (Ps) peuvent être appliquées à la membrane (M) par l'intermédiaire d'un système d'apport d'agent pressurisé (4) et d'une chambre de pression (5.1).
PCT/DE2006/000504 2005-03-21 2006-03-17 Dispositif et procede pour separer ou perforer une piece realisee au moyen d'un procede de deformation a pression interne elevee WO2006099853A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510013689 DE102005013689B3 (de) 2005-03-21 2005-03-21 Vorrichtung und Verfahren zum Trennen oder Lochen eines nach dem Innenhochdruckumformverfahren hergestellten Werkstücks
DE102005013689.3 2005-03-21

Publications (2)

Publication Number Publication Date
WO2006099853A1 true WO2006099853A1 (fr) 2006-09-28
WO2006099853A8 WO2006099853A8 (fr) 2007-04-12

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PCT/DE2006/000504 WO2006099853A1 (fr) 2005-03-21 2006-03-17 Dispositif et procede pour separer ou perforer une piece realisee au moyen d'un procede de deformation a pression interne elevee

Country Status (2)

Country Link
DE (1) DE102005013689B3 (fr)
WO (1) WO2006099853A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106345953A (zh) * 2016-09-29 2017-01-25 天津天锻航空科技有限公司 可用于周向非封闭变截面筒状零件成形工装及成形方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2426114T3 (es) * 2009-12-14 2013-10-21 Schuler Smg Gmbh & Co. Kg Procedimiento para la fabricación de componentes según la técnica de conformación por alta presión interna
FR2955196B1 (fr) * 2010-01-08 2012-08-17 Sigedi Procede et dispositif de demantelement d'une tuyauterie potentiellement contaminee

Citations (4)

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Publication number Priority date Publication date Assignee Title
GB726618A (en) * 1952-07-16 1955-03-23 Forges Ateliers Const Electr Machine for use in manufacturing metal containers
US5771730A (en) * 1996-08-30 1998-06-30 Gec Alsthom Acb Equipment for forming metal profiles
DE19935714A1 (de) * 1999-07-29 2001-02-08 Thyssen Krupp Automotive Ag Vorrichtung und Verfahren zum Trennen oder Lochen eines Werkstückes
EP1308224A2 (fr) * 2001-10-31 2003-05-07 Alcan Technology & Management AG Méthode et dispositif de formage et/ou découpage d' un corps creux d' un profilé creux ou une pièce similaire

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DE4035625A1 (de) * 1990-11-09 1992-05-14 Audi Ag Verfahren zum herstellen eines durchbruches in der wandung eines als hohlkoerper ausgebildeten werkstueckes und werkzeug zur durchfuehrung des verfahrens
DE19506067C1 (de) * 1995-02-22 1996-06-20 Krupp Ag Hoesch Krupp Verfahren zum Ausschneiden eines Ausschnitts aus der Wandung eines als Hohlkörper ausgebildeten Bauteils und Vorrichtung zur Durchführung des Verfahrens
DE19533828C2 (de) * 1995-09-13 1997-11-20 Daimler Benz Ag Vorrichtung zum Innenhochdruckumformen von rohrförmigen Rohlingen
DE19911125C1 (de) * 1999-03-12 2000-11-16 Forschungsges Umformtechnik Verfahren und Vorrichtung zum Trennen oder Lochen eines Werkstücks unter Einfluß eines unter Hochdruck stehenden Druckmediums
DE10065033C1 (de) * 2000-12-23 2002-07-11 Daimler Chrysler Ag Verfahren zur Herstellung eines umfänglich geschlossenen Hohlprofiles und eine Vorrichtung zur Durchführung desselben

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB726618A (en) * 1952-07-16 1955-03-23 Forges Ateliers Const Electr Machine for use in manufacturing metal containers
US5771730A (en) * 1996-08-30 1998-06-30 Gec Alsthom Acb Equipment for forming metal profiles
DE19935714A1 (de) * 1999-07-29 2001-02-08 Thyssen Krupp Automotive Ag Vorrichtung und Verfahren zum Trennen oder Lochen eines Werkstückes
EP1308224A2 (fr) * 2001-10-31 2003-05-07 Alcan Technology & Management AG Méthode et dispositif de formage et/ou découpage d' un corps creux d' un profilé creux ou une pièce similaire

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106345953A (zh) * 2016-09-29 2017-01-25 天津天锻航空科技有限公司 可用于周向非封闭变截面筒状零件成形工装及成形方法

Also Published As

Publication number Publication date
WO2006099853A8 (fr) 2007-04-12
DE102005013689B3 (de) 2006-01-05

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