US20070277574A1 - Internal High-Pressure Shaping Device - Google Patents

Internal High-Pressure Shaping Device Download PDF

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Publication number
US20070277574A1
US20070277574A1 US10/582,474 US58247404A US2007277574A1 US 20070277574 A1 US20070277574 A1 US 20070277574A1 US 58247404 A US58247404 A US 58247404A US 2007277574 A1 US2007277574 A1 US 2007277574A1
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US
United States
Prior art keywords
hollow profile
clamping jaw
forming tool
actuator
displaced
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.)
Abandoned
Application number
US10/582,474
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English (en)
Inventor
Matthias Schroeder
Stefan Schwarz
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
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 DaimlerChrysler AG filed Critical DaimlerChrysler AG
Assigned to DAIMLERCHRYSLER AG reassignment DAIMLERCHRYSLER AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHWARZ, STEFAN, SCHROEDER, MATTHIAS
Publication of US20070277574A1 publication Critical patent/US20070277574A1/en
Assigned to DAIMLER AG reassignment DAIMLER AG CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: DAIMLERCHRYSLER AG
Assigned to DAIMLER AG reassignment DAIMLER AG CORRECTIVE ASSIGNMENT TO CORRECT THE APPLICATION NO. 10/567,810 PREVIOUSLY RECORDED ON REEL 020976 FRAME 0889. ASSIGNOR(S) HEREBY CONFIRMS THE CHANGE OF NAME. Assignors: DAIMLERCHRYSLER AG
Abandoned 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
    • B21D26/033—Deforming tubular bodies
    • B21D26/045—Closing or sealing means

Definitions

  • the present invention relates to a device for internal high pressure forming.
  • a method and a device for the internal high pressure forming of a hollow profile closed at the periphery form the subject matter of a German Patent Application, still not published at the time of the present application, having the official reference 103 49 699.8 and dated Oct. 24, 2003.
  • the known device has an internal high pressure forming tool with a sealing arrangement which contains an axial punch having a section plunging into the hollow profile for holding and sealing an end of the hollow profile, this end projecting from the impression of the forming tool.
  • a unit for generating a high fluid pressure is provided for expanding the hollow profile by means of fluidic internal high pressure.
  • the sealing arrangement contains at least one clamping jaw and a pressing element which, when the section of the axial punch has plunged in, presses radially on the hollow profile end, the clamping jaw fixes the hollow profile end in position.
  • the hollow profile blank Since the hollow profile blank, on account of the firm, axially immovable hold at the end, cannot be drawn into the impression during the forming, firstly the original overall length of the hollow profile blank is unaffected by the forming and secondly no material of the hollow profile end can subsequently flow from the end into the mold space. In the case of long forming sections, a largely uniform distribution of the wall thickness can be achieved at each point of the hollow profile blank.
  • European document EP 1 152 843 B1 discloses a device for the internal high pressure forming of a hollow profile, which device has a forming tool and a sealing arrangement for holding and sealing an end of the hollow profile, this end projecting from the impression of the forming tool.
  • the sealing arrangement is formed by a section of an axial punch, this section plunging into the hollow profile, and by at least one clamping jaw which, when the section of the axial punch has plunged in, presses radially from outside on the hollow profile end in such a way that the clamping jaw fixes the latter in position.
  • the clamping jaw is connected to an actuator which drives it for displacing it only radially to the hollow profile axis.
  • German document DE 197 51 407 C1 discloses a device for hydraulically sealing a hollow profile.
  • the device has a die and a clamping and feed unit and also a plurality of sealing elements closing the hollow profile.
  • the die consisting of two die halves has, on the inside, a respective rounded bulged section extending radially inward over the periphery, the clamping and feed unit being provided with an axially movable mandrel which can be pushed into the hollow profile by means of a push-pull element.
  • This mandrel is positioned with respect to the die in such a way that the bulged sections of the die lie such that they correspond to a mandrel section of corresponding design. Since the distance from the tube end is therefore not limited, sealing at any desired location in the tool is possible.
  • German document DE 38 20 952 C2 discloses a device for hydraulically expanding metallic hollow profiles generally open at end faces.
  • the open end faces in this case are closed by rigid sealing heads which surround the inner or outer surface of the hollow profile in a close-fitting manner but at a slight distance apart.
  • a sealing gap in between is sealed off in an elastic sealing ring which is designed as a hollow body and to which internal pressure can be applied.
  • the sealing ring is enclosed in the sealing head in such a way that, as a result of the internal pressure, it can expand only in the direction of the outer or inner surface of the hollow profile to be sealed and comes into tight contact with the latter.
  • the result of the enclosing of the sealing ring is therefore that the elastic material cannot give way laterally.
  • German document DE 197 33 473 A1 discloses a method and a device for connecting a hollow-cylindrical air/fuel-ratio detector holder to an exhaust pipe provided with an opening for admitting exhaust gas to the air/fuel-ratio detector fastened in the holder.
  • the method uses the internal high pressure technique for connecting the air/fuel-ratio detector holder.
  • the contour of the exhaust pipe is adapted in a simple manner to the bearing contour of the lateral surface of the holder at the location at which the future bearing surface of the holder is provided.
  • the connection of the lateral surface of the holder to the exhaust pipe saves construction space.
  • the holder, at this location, is virtually sunk into the exhaust pipe, but at least into the pipe wall.
  • the present invention deals with the problem of specifying an improved embodiment for a device for internal high pressure forming of the type mentioned at the beginning, which embodiment ensures in particular reliable holding and sealing of the semi-finished ends of the hollow profile and at the same time enables high-quality components formed by internal high pressure to be produced.
  • an actuator drives a clamping jaw for displacing it only radially to the hollow profile axis and thus presses the clamping jaw from outside onto the hollow profile end in such a way that the latter is fixed in position.
  • Counteracting the pressure force in the process is a section of an axial punch, this section plunging into the hollow profile and being part of the sealing arrangement and supporting the hollow profile end from inside against the clamping jaw pressing from outside.
  • the actuator results in the hollow profile end already being clamped and thus held and sealed before the actual forming operation, so that the hollow profile blank can be moved into the forming tool when the latter is open and as a result any damage to a surface of the hollow profile blank can be avoided or at least reduced.
  • the hollow profile blank can be reliably held during the entire production process by being pressed against the axial punch by means of the clamping jaw acting radially from outside. As a result, this prevents a situation in which the hollow profile blank can be pulled off the axial punch during the internal high pressure forming process and thus its sealing effect is reduced or even neutralized.
  • the hollow profile blank cannot be drawn into the impression or cavity block, firstly the original overall length of the hollow profile blank remains unaffected by the forming and secondly no material of the hollow profile blank can subsequently flow from the end into the mold space, so that, in the case of long forming sections, a largely uniform distribution of the wall thickness prevails at each point of the hollow profile blank.
  • the largely uniform distribution of the wall thickness also ensures production of a component coil without any problems, from which, after forming has been effected, a plurality of individual components of identical configuration are produced in a subsequent parting process, these individual components having identical or at least similar functional properties on account of the uniform distribution of the wall thickness.
  • the hollow profile end is not changed in its shape by expansion, and at least the inside diameter is also retained, subsequent end trimming may be dispensed with, which saves production time and reduces the costs for the entire production process.
  • At least one V-ring is arranged on a side of the clamping jaw facing the hollow profile end. Due to the interlocking thereby achieved, not only is the hollow profile end held more intensely between the clamping jaw and the axial punch, but the axial material flow within the hollow profile end is interrupted, which prevents creeping of the hollow profile at its end in the direction of the forming tool impression. The result of this is that lower pressure forces have to be applied in order to sufficiently counter the drawing-in which is caused during the internal high pressure forming.
  • the actuator comprises at least one hydraulic cylinder or is formed by at least one hydraulic cylinder.
  • the clamping jaw can be pressed onto the hollow profile end hydraulically and thus in a powerful and precise manner.
  • hydraulic cylinders constitute a drive technology which has proved successful for many years and is thus reliable, so that the actuator can be realized in a cost-effective manner with regard to operation and maintenance.
  • the actuator enables the clamping jaw to be displaced when the forming tool is open.
  • the forming tool may be formed, for example, from at least two die parts which are displaceable relative to one another and form the impression in the closed state. Due to the displaceability of the clamping jaw when the forming tool is open, it is possible to move the hollow profile blank into the forming tool without there being a risk of damage to the surface of the hollow profile blank in the process, since the two die parts lie well outside the path of movement of the hollow profile blank. Especially high quality requirements can be fulfilled by surface damage being avoided or reduced.
  • the die parts can expediently be displaced while the clamping jaw fixes the hollow profile end. This results in a method advantage, since the die parts must first be displaced onto the hollow profile blank directly before the internal high pressure forming and thus premature damage to the surface of the hollow profile blank caused by a bearing surface of the cavity block can be avoided. At the same time, this prevents the end of the hollow profile blank from being drawn in as a result of preprofiling for the case where the hollow profile blank, from the closing movement of the forming tool, is to be compressed and thus preprofiled.
  • FIG. 1 shows one part of a device for internal high pressure forming in an initial position
  • FIG. 2 shows an illustration similar to that of FIG. 1 but with an axial punch placed against one end of a hollow profile
  • FIG. 3 shows an illustration similar to that of FIG. 2 but with a clamping jaw pressed onto the end of the hollow profile from outside, and
  • FIG. 4 shows an illustration similar to that of FIG. 3 but with closed forming tool.
  • a device 10 for the internal high pressure forming of a hollow profile 5 has a cavity block 1 , adjustably mounted clamping jaw 3 arranged thereon, and an axial punch 4 .
  • the cavity block 1 is part of a forming tool (not explained in any more detail) in which the hollow profile 5 is expanded by internal high pressure and is formed in accordance with an impression 16 .
  • the clamping jaw 3 and the axial punch 4 are part of a sealing arrangement 11 which serves to hold and seal an end 12 of the hollow profile 5 , this end 12 projecting from the impression 16 or cavity block 1 of the forming tool.
  • the axial punch 4 has a plunging section 6 (sealing region), with which the axial punch 4 plunges into the hollow profile 5 .
  • FIGS. 1 to 4 in each case only one part of the device, for example a top part in FIGS. 1 and 3 and a bottom part in FIGS. 2 and 4 , is shown.
  • the axial punch 4 widens from its plunging section 6 to the rest of the punch body in a stepped manner while forming a shoulder (not designated in any more detail), by means of which the axial punch 4 strikes the hollow profile end 12 while assuming the position of use.
  • the plunging section 6 of the axial punch 4 is in this case dimensioned in such a way that it comes to lie in the position of use (cf. FIGS. 2 to 4 ) on a certain extension length in the forming tool. Due to the mounting thus achieved, the axial punch 4 remains oriented in a centered manner, which helps to achieve a lasting sealing function.
  • Running in the axial punch 4 is at least one axial action-medium passage 7 , which on the one hand is connected to a unit for generating high fluid pressure and on the other hand opens out at an end face 13 of the axial punch 4 .
  • An outside diameter of the axial punch 4 on the plunging section 6 is favorably dimensioned in such a way that it corresponds to the inside diameter of the hollow profile end 12 or falls slightly below the latter, so that the section 6 comes to lie in the hollow profile end 12 free of play, but without plastic expansion of the hollow profile end 12 , or with slight play.
  • the sealing arrangement 11 has at least one clamping jaw 3 , which is an integral part of the forming tool and which is mounted on the outer side of the forming tool in such a way as to be displaceable radially to the hollow profile axis.
  • At least one V-ring 2 is provided on an end face, facing the hollow profile end 12 , of the clamping jaw 3 , and this V-ring 2 , when the clamping jaw 3 presses on the hollow profile end 12 resting in place on the plunging section 6 , notches and fixes said hollow profile end 12 .
  • the notch produced by the V-ring 2 can be advantageously used, for example, during further use of the hollow profile 5 in an operation for joining it to other components.
  • an actuator 14 is provided for actuating the clamping jaw 3 (cf FIGS. 3 and 4 ) and drives the latter for displacing it only radially relative to the hollow profile axis.
  • the actuator 14 may be formed by at least one hydraulic cylinder or may comprise at least one hydraulic cylinder.
  • the actuator 14 it is also conceivable for the actuator 14 to be formed by at least one electric motor or to comprise at least one electric motor.
  • the device 2 has at least two die parts 15 adjustable relative to one another, for example a top die part 15 ′ and a bottom die part 15 ′′, which can be displaced toward and away from one another independently of the clamping jaw 3 .
  • the actuator 14 enables the clamping jaw 3 to be displaced when the forming tool is open.
  • the clamping jaw 3 In order to enable the clamping jaw 3 to be displaced independently of the die part 15 , the clamping jaw 3 , according to FIG. 3 , can be supported for example on the forming tool, that is to say on the die part 15 ′, whereas the die part 15 ′ is supported on a foundation 9 .
  • both the clamping jaw 3 and the die part 15 ′ of the forming tool to be supported independently of one another on the foundation 9 .
  • the clamping jaws 3 may be carried along axially. This ensures controllable subsequent feeding of material during the forming process, as a result of which the quality of the hollow profile 5 produced can be increased.
  • the clamping jaws 3 may either be carried along passively or via a, for example power-controlled, actuator (not shown), which permits a displacement of the clamping jaws 3 with respect to the die parts 15 axially relative to the hollow profile 5 .
  • the hollow profile 5 is inserted into the bottom die 15 ′′ of the forming tool, whereupon the section 6 of the axial punch 4 , according to FIG. 1 , is pushed in the direction of movement 8 into both ends, here into the end 12 of the hollow profile 5 , until its shoulder strikes the hollow profile end 12 .
  • the plunging section 6 it is conceivable for the plunging section 6 to be pushed into the hollow profile 5 beforehand and for the latter to then be displaced between the two die parts 15 ′ and 15 ′′.
  • the clamping jaw 3 is pressed radially from outside onto the hollow profile end 12 by means of the actuator 14 and thus fixes the latter in position on the plunging section 6 of the axial punch 4 . Due to the movement of the clamping jaw 3 in the direction of movement 8 ′ toward the hollow profile end 12 , the latter is notched by the V-ring 2 due to the pressure force exerted by the actuator 14 .
  • the actuator 14 for displacing the die parts 15 ′ and 15 ′′ or the clamping jaws 3 to be designed as a hydraulic or electromechanical actuator.
  • V-ring 2 shown according to FIGS. 1 to 4 represents only one possible variant, clamping jaws 3 without V-rings 2 also being conceivable.
  • the clamping jaw 3 is connected frictionally to the hollow profile end 12 , with an interference fit being formed, and is thus sealed.
  • the clamping operation and thus the sealing operation by the clamping jaw 3 being pressed radially onto the hollow profile end 12 has been completed and the hollow profile 5 is fixed in position in the device 10 .
  • the die part 15 ′ is now displaced toward the hollow profile 5 in the direction of movement 8 ′′ by the actuator 14 ′. It is conceivable here for either only the top die part 15 ′ or else the top and the bottom die parts 15 ′, 15 ′′ to perform a closing movement.
  • the two die parts 15 ′ and 15 ′′ are displaced toward one another until the two die parts 15 ′ , 15 ′′ outside the impression 16 come to lie on the hollow profile 5 .
  • the die parts 15 ′ and 15 ′′ are displaced, while the clamping jaw 3 fixes the hollow profile end 12 .
  • the clamping effect of the clamping jaws 3 prevents the hollow profile end 12 from being drawn into the impression 16 by the top die part 15 ′ during the closing movement.
  • the closing operation of the forming tool has now been completed, so that the hollow profile 5 , by means of the unit for generating high fluid pressure, can be filled with a pressure fluid via the at least one action-medium passage 7 .
  • the pressure fluid is put under an internal high pressure, as a result of which the hollow profile 5 expands and comes into contact with the inner wall of the impression 16 in such a way as to conform to the contour.
  • the clamping jaws 3 prevent the hollow profile end 12 from being drawn into the impression 16 and at the same time seal the hollow profile end 12 .
  • the internal high pressure forming has been effected, first the die parts 15 ′ and 15 ′′ and then the clamping jaws 3 are retracted or opened, so that the finish-formed hollow profile 5 can be removed by withdrawal of the axial punch 4 .

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US10/582,474 2003-12-13 2004-11-17 Internal High-Pressure Shaping Device Abandoned US20070277574A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10358493.5 2003-12-13
DE10358493A DE10358493B4 (de) 2003-12-13 2003-12-13 Vorrichtung zum Innenhochdruckumformen
PCT/EP2004/013015 WO2005056211A1 (de) 2003-12-13 2004-11-17 Vorrichtung zum innenhochdruckumformen

Publications (1)

Publication Number Publication Date
US20070277574A1 true US20070277574A1 (en) 2007-12-06

Family

ID=34672718

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/582,474 Abandoned US20070277574A1 (en) 2003-12-13 2004-11-17 Internal High-Pressure Shaping Device

Country Status (4)

Country Link
US (1) US20070277574A1 (de)
CA (1) CA2550124A1 (de)
DE (1) DE10358493B4 (de)
WO (1) WO2005056211A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130305532A1 (en) * 2010-11-19 2013-11-21 Rico Demuth Method and parts for making a tubular workpiece, in particular a built-up camshaft
US20180078988A1 (en) * 2015-06-02 2018-03-22 Sumitomo Heavy Industries, Ltd. Forming apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015108500A1 (de) * 2015-05-29 2016-12-01 Salzgitter Mannesmann Line Pipe Gmbh Verfahren und Vorrichtung zur Herstellung von Bimetallrohren

Citations (8)

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US5233854A (en) * 1992-05-11 1993-08-10 General Motors Corporation Press apparatus for hydroforming a tube
US5644943A (en) * 1996-04-22 1997-07-08 Franke Inc. Method for forming a seamless stainless steel sink bowl with a grid ledge and product
US5644829A (en) * 1993-08-16 1997-07-08 T I Corporate Services Limited Method for expansion forming of tubing
US5735156A (en) * 1994-09-20 1998-04-07 Hitachi, Ltd. Method and apparatus for forming a non-circular pipe
US5890387A (en) * 1989-08-24 1999-04-06 Aquaform Inc. Apparatus and method for forming and hydropiercing a tubular frame member
US5979201A (en) * 1996-08-26 1999-11-09 Cosma International Inc. Hydroforming die assembly for pinch-free tube forming
US6279364B1 (en) * 1999-02-16 2001-08-28 Gary E. Morphy Sealing method and press apparatus
US6487886B2 (en) * 2000-03-09 2002-12-03 Toyota Jidosha Kabushiki Kaisha Irregular-section tubular body and axle beam for torsion beam and method of manufacturing the same

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JPS57165134A (en) * 1981-04-03 1982-10-12 Hitachi Ltd Hydraulic bulge working device
AU2170297A (en) * 1997-03-27 1998-10-22 Ti Corporate Services Limited Method and apparatus for forming of tubing
DE19733473C2 (de) * 1997-08-02 2000-07-06 Daimler Chrysler Ag Verfahren und Vorrichtung zur Herstellung einer Anbindung eines lambda-Sondenhalters an ein Abgasrohr
DE19751407C1 (de) * 1997-11-14 1999-07-15 Mannesmann Ag Verfahren und Vorrichtung zum hydraulischen Abdichten eines Hohlprofils
DE10309915C1 (de) * 2003-03-07 2003-11-27 Audi Ag Vorrichtung zum Trennen und/oder Lochen eines rohrförmigen hohlen Werkstücks mit Innenhochdruck

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5890387A (en) * 1989-08-24 1999-04-06 Aquaform Inc. Apparatus and method for forming and hydropiercing a tubular frame member
US5233854A (en) * 1992-05-11 1993-08-10 General Motors Corporation Press apparatus for hydroforming a tube
US5644829A (en) * 1993-08-16 1997-07-08 T I Corporate Services Limited Method for expansion forming of tubing
US5735156A (en) * 1994-09-20 1998-04-07 Hitachi, Ltd. Method and apparatus for forming a non-circular pipe
US5644943A (en) * 1996-04-22 1997-07-08 Franke Inc. Method for forming a seamless stainless steel sink bowl with a grid ledge and product
US5979201A (en) * 1996-08-26 1999-11-09 Cosma International Inc. Hydroforming die assembly for pinch-free tube forming
US6279364B1 (en) * 1999-02-16 2001-08-28 Gary E. Morphy Sealing method and press apparatus
US6487886B2 (en) * 2000-03-09 2002-12-03 Toyota Jidosha Kabushiki Kaisha Irregular-section tubular body and axle beam for torsion beam and method of manufacturing the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130305532A1 (en) * 2010-11-19 2013-11-21 Rico Demuth Method and parts for making a tubular workpiece, in particular a built-up camshaft
US9284858B2 (en) * 2010-11-19 2016-03-15 Thyssenkrupp Presta Teccenter Ag Method and parts for making a tubular workpiece, in particular a built-up camshaft
US20180078988A1 (en) * 2015-06-02 2018-03-22 Sumitomo Heavy Industries, Ltd. Forming apparatus
US10926313B2 (en) * 2015-06-02 2021-02-23 Sumitomo Heavy Industries, Ltd. Forming apparatus

Also Published As

Publication number Publication date
WO2005056211A1 (de) 2005-06-23
DE10358493A1 (de) 2005-07-14
DE10358493B4 (de) 2006-01-05
CA2550124A1 (en) 2005-06-23

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Effective date: 20071019