EP0876860A2 - Procédé et dispositif de fabrication de profilés creux bombés - Google Patents

Procédé et dispositif de fabrication de profilés creux bombés Download PDF

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Publication number
EP0876860A2
EP0876860A2 EP98107665A EP98107665A EP0876860A2 EP 0876860 A2 EP0876860 A2 EP 0876860A2 EP 98107665 A EP98107665 A EP 98107665A EP 98107665 A EP98107665 A EP 98107665A EP 0876860 A2 EP0876860 A2 EP 0876860A2
Authority
EP
European Patent Office
Prior art keywords
hollow profile
tool part
internal high
tool
shape
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.)
Granted
Application number
EP98107665A
Other languages
German (de)
English (en)
Other versions
EP0876860B1 (fr
EP0876860A3 (fr
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
Daimler Benz 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, Daimler Benz AG filed Critical DaimlerChrysler AG
Publication of EP0876860A2 publication Critical patent/EP0876860A2/fr
Publication of EP0876860A3 publication Critical patent/EP0876860A3/fr
Application granted granted Critical
Publication of EP0876860B1 publication Critical patent/EP0876860B1/fr
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
    • 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
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • B21D53/90—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards axle-housings

Definitions

  • the invention relates to a method for producing bulged Hollow profiles according to the preamble of the claim 1 and a device according to the preamble of the claim 14 to carry out the method.
  • a generic method or a generic device is known from EP 0 439 764 B1.
  • the subspecies hydroforming which describes expansion-upsetting, in which a linear tubular hollow profile at both ends in each case a hollow cylindrical closed on the back Hollow profile receptacle is inserted.
  • a cylindrical stamp with little play is added, which is gradually tapered in the area of its end face, whereby the stamp with the receiving wall an annular Gap forms.
  • the hollow profile is jammed in this gap plugged in. Is on the facing end faces one die each with a bulbous to the other die open recess attached, being in the later attachment of the two matrices to each other the recesses the whole Form engraving.
  • the tenn plane of the one formed by the matrices Internal high-pressure forming tool thus runs transverse to axial extension of the hollow profile, the matrices central Have bushings that protrude from the hollow profile will.
  • a fluid channel is formed in the stamps, connected to the outside of a high-pressure fluid production system is. After filling the hollow profile via the fluid channel the fluid is tensioned by applying a high pressure, after which the hollow profile widens in the area of the recess, until there is a rotationally symmetrical when the matrices are in contact with one another Bulges forms.
  • the hollow profile recordings moving towards each other by means of a drive, whereby the hollow profile is compressed.
  • the invention has for its object a generic To further develop a method and a generic device, that a hollow profile with a simple Bulge high forming wheel can be manufactured reliably can.
  • the task is according to the invention by the features of the claim 1 regarding the procedure and the characteristics of claim 14 solved with regard to the device.
  • the flattening makes material the remaining volume moved so that sufficient widening during subsequent expansion Hollow section material is available for thinning to largely prevent the hollow profile wall, which is essential for damage-free, i.e. reliable internal high pressure forming contributes.
  • the hollow profile is deformed into the bulge area, despite Consistently high degree of deformation from the initial shape to the bulged Final shape due to the flattened intermediate shape achieved, from which to achieve the final shape by hydroforming a significantly lower degree of deformation is required is a bulky bulge in a simple manner trained on the hollow profile free of damage, or a bulged Hollow profile, which requires large degrees of deformation for its production, be produced without bursting of the hollow profile due to the failure of the hollow profile material during the High pressure forming process parts committee is produced.
  • the retention of the flattening during the entire forming process ensures the provision of the hollow profile material for the Internal high-pressure forming process, the final shape - accordingly the number of flattening points - at least one peripheral point remains flattened in the expansion area.
  • the invention Process is therefore extensive for the production of fully rounded parts unsuitable.
  • it is Process in turn very advantageous for the production of components, at which point a flattening for the later Further processing or reuse desired or even downright is necessary, being due to the contour accuracy at Reshaping by means of high internal pressure, i.e. tolerance-free bulged hollow profiles can be produced reliably.
  • Figs. 1a and 1b is a formed by means of internal high pressure elongated (length: 1-2 m) hollow profile 1 shown, which is in divided into three sections 2,3,4. Sections 2 and 3 are tubular, the respective section 3 itself the section 2 forming the hollow profile end directly and concentrically expanded. The transition to the section 3 runs flat conical. Which is on the end of the hollow profile opposite side of section 3 immediately following section forming the central region of the hollow profile 1 4 is bulged perpendicular to the longitudinal extent here and, as can be seen from Fig. 1b, transversely to the bulge direction flattened on both sides.
  • the hollow profile 1 can, for example, be an axle housing Motor vehicle, in particular a commercial vehicle, in its Bulging area 8, ie in section 4 of the hollow profile 1 the differential gear can be arranged.
  • the flats have the hollow profile through a separation process an opening on the one hand after installing the differential closed by screwing on a bulbous cover 5 becomes.
  • a threaded ring 7 surrounding the opening is welded on to which the differential is attached. It is conceivable - alternatively to the previous one - to provide the flattening only on one side, so that there is also a bulge in hydroforming in the surface normal pointing away from the flattening the flattened side of the hollow profile 1 in the following direction is coming. This bulge forms a kind of in the Hollow profile 1 integrated cover 5, which makes this separate Additional component to be manufactured and assembled with relief the manufacturing and assembly effort for the axle housing could be omitted.
  • FIG. 2 becomes one in the bulging area on two opposite Flattened hollow profile 1 with elongated, slim, linear tubular starting shape in a tool part 9 of an internal high-pressure forming tool 10, wherein the hollow profile axis 14 in the parting plane of the tool part 9 runs.
  • the flattening is carried out with a flattening device in one of the Forming tool 10 manufactured separately arranged work station.
  • a flattening device in one of the Forming tool 10 manufactured separately arranged work station.
  • the flattening only at Closing the two-part in two surrounding the bulge area 8 Matrices 11, 12 divided tool part 9 by a corresponding one Design of the die engraving 13 is generated.
  • This has the advantage that instead of two manufacturing devices, the flattening device and the tool part 9, only one only manufacturing tool is required because the flattening device is integrated in the tool part 9. This spares you on the one hand, investment costs, on the other hand, the hollow profile 1 with the generated flattening for later hydroforming arranged in a defined position in the tool part 9.
  • the upper die 12 is driven by a hydraulic drive Move towards the lower die 11, after which the The closed position of the tool part 9 is reached.
  • the die engraving 13, the forming engraving of the tool part 9 of the hydroforming tool 10 for the bulge area 8, is shape negative according to the bulge to be produced trained and has according to the respective flattening a flat area where it is in the closed position of the tool part 9 abuts. This flat area can also simultaneously form the flattening device.
  • the flat area is immovable during the entire forming process Flattening so that this is maintained.
  • the engraving 13 of the Tool part 9 is from its edge to the apex the bulging area 8 domed flat rising, so that only large radii in the tool part during the bulging process 9 are present, on which the hollow profile 1 bears.
  • the matrices 11, 12 have two opposite, starting from the edge, leading to the engraving 13, in the parting plane of the Tool part 9 located semi-cylindrical recesses that together in the closed position of the tool part 9 two in its Divisions opposite and edge-arranged bushings 15 form, in which the inserted into the tool part 9 Hollow profile 1 is kept circumferentially enclosed. At the same time the hollow profile 1 extends through the bushings 15 at both ends. To the extent possible when expanding on the bushings 15 To generate little friction, the matrices 11, 12 are Tool part 9 designed such that it only with one rest narrow edge strips 16 in the closed position.
  • the matrices 11, 12 also have a radial profile with respect to the hollow profile 1 directional central guide hole opening into the engraving 13 17, in which a support stamp 18 relative to the position of the Die 11,12 is guided.
  • the support stamp 18 carries on its end facing the inserted hollow profile 1 19 for the central section of the forming engraving 13 the contour corresponding to the respective die 11, 12 and lies in the closed position of the tool part 9 on the hollow profile 1.
  • the support stamp 18 serves as a counter-holder for the bulging hollow profile 1, with a hydraulic drive 20 is provided with a control for the internal high pressure and the movement of the hollow profile recordings mentioned below correlates is.
  • the support stamp 18 is the bulging movement of the hollow profile 1 controllable so that the middle part of the bulge is even with the edge part is formed and thus a successive Engages on the engraving 13 from the edge of the die 11, 12, causing cracks in the hollow profile 1 due to premature thinning of the material can be prevented in the middle part.
  • each of the two hollow profile recordings 21, 22 is composed of a guide housing 25 and a sleeve 26.
  • the guide housing 25 is with the hydraulic cylinder 23 connected and has a central implementation 27 and an annular space 28 surrounding the leadthrough 27.
  • the sleeve 26 is in the annular space 28 between two stops forming opposite end faces 29, 30 of the annular space 28 guided axially displaceable. That facing away from the tool part 9 End 31 of the sleeve 26 is under pressure, whereby this End 31 and on the opposite end face 29 of the annular space 28 supports a compression spring 32. This end 31 points an annular collar 40, which in the working position of FIG. 2 with the side facing away from the compression spring 32 on the end face 30 of the annular space 28 abuts.
  • the other end 33 of the sleeve 26 extends through the guide housing 25 towards the tool part 9.
  • the the pressure side of the sleeve 26 can also be hydraulic or pneumatically.
  • the implementation 27 of the guide housing 25 is with respect to tubular initial shape of the hollow profile 1 is of the same shape, however, has a smaller cross section or one smaller diameter.
  • the bushing 27 has a centering cone 35 to which immediately a bushing formed in the sleeve 26 36 connects seamlessly.
  • the regarding the initial form of the Hollow profile 1 also has the same contour passage 36 a larger cross-section or diameter by a small amount of play than the tubular starting shape of the hollow profile 1.
  • the hollow profile receptacle 21, 22 can instead of a two-part from a guide housing 25 and a sliding in this Sleeve 26 existing component can be integrally formed, wherein the compression spring 32 and the annular space 28 are eliminated.
  • the rigid one Hollow profile receptacle 21, 22 has a comparatively simplified construction only two component sections with bushings different Diameter on each other over a Connect the conical opening to the tool part 9. The diameters are relative to that of the initial shape of the hollow profile 1 - as mentioned above - dimensioned accordingly.
  • the implementation 27 of the guide housing 25 of the hollow profile receptacles 21,22 is on the back of a postmark 37 locked in it by means of a separate drive is guided in a fluid-tight manner.
  • Postmark 37 has a conically tapering pin 38 on the end face between its chamfer and the duct wall 39 of the guide housing 25 in the hollow profile receptacle 21, 22nd hollow profile 1 to be inserted can be clamped in a sealing manner.
  • a fluid channel which on the one hand via the high-pressure fluid connection with a high-pressure fluid generation system is connected and on the other hand by the Pin 38 opens axially into the hollow profile receptacle 21, 22, after which the inserted hollow profile 1 with the pressure fluid can be filled and subjected to high pressure.
  • the spigot 38 also on a rear of the hollow profile receptacle 21,22 Be formed bottom, which closes the passage 27 and which has a high pressure fluid connection.
  • the Implementation 27 is replaced by a blind hole. Of the Postmark 37 and its control can be under There is no need to reduce the expenditure on equipment.
  • the hollow profile receptacles 21, 22 are now shown in FIG Hydraulic cylinder 23 move further towards one another in the direction of the arrow, the hollow profile ends due to the slightly larger Diameter of the bushing 36 of the sleeve 26 inserted into it will.
  • the hollow profile ends are moved over the centering cone 35 of the implementation 27 introduced into this, due to the action of with smaller diameter with regard to the hollow profile ends Implementation 27 and the thrust of the cylinders 23 Ends are drawn.
  • the postmark is made 37 moved in the direction of the tool part 9, wherein it in the hollow profile end is inserted and so its shape essentially maintained.
  • the hollow profile end is entirely of the hollow profile receptacle 21, 22 enclosed.
  • the hollow profile end By pulling in the hollow profile end its diameter up to 30% of the diameter of the original shape downsized, whereby the hollow profile 1 after the final Hydroforming the three sections 2,3,4 cross section of different sizes.
  • Starting from that Hollow section end as section 2 of smallest diameter is the Degree of deformation with respect to the section provided with the bulge 4 very large, but the degree of deformation is based on Section 3, which has a larger diameter, and of from which the actual expansion starts. Consequently the hollow profile 1 in the internal high-pressure forming tool 10 as a whole can be formed with very high degrees of deformation.
  • the hollow profile 1 in one means of the hydraulic cylinder 23 operated compression process pushed together, without causing relative movements to generate friction between the hollow profile receptacle 21 and 22 and the hollow profile 1 is coming.
  • the hollow profile 1 in the tool part 9 bulged, the hollow profile 1 to the engraving 13 of the Matrices 11, 12 at least approximately creates.
  • the support punches 18 are compressed according to the direction of the arrow retracted radially outward, whereby they for controlled forming in the bulge area 8 during the the entire bulging process on the hollow profile 1 and in the Final position of the production process flush in the engraving process are closely fitting with their end face 19.
  • sections 2 and 3 have been slightly expanded, which are on the bushing walls 39 and 42 of the guide housing 25 and the sleeve 26 nestle.
  • Section 3 remains in terms of its diameter essentially unchanged.
  • hollow profile material to bulge area 8 can deliver the expansion of the hollow profile end also reloading stamps 37 in a relative movement to the hollow profile receptacle 21, 22 further to Tool part 9 can be moved.
  • the hollow profile 1 by expanding to one of the final forms in terms of Contour and cross-sectional size roughly approximated intermediate shape can then increase the internal high pressure
  • the intermediate shape is calibrated to 1000-3000 bar to the final shape will.
  • the fluid pressure is released and by means of the hydraulic cylinders 23 the hollow profile receptacles 21,22 retracted, the compression spring 32 again can relax. Since the hollow profile 1 at its bulge is held by the matrices 11, 12 when moving back of the receptacles 21, 22 the hollow profile ends from the through the Pulling in and the hydroforming created a press fit the bushing 39 and 42 detached in a simple manner. Finally, the dies 11, 12 are removed from the bulging area 8 retracted, whereby the tool part 9 opens and the fully formed hollow profile 1 can be removed can.
  • hollow profile 1 In addition, one-sided flattening is conceivable on the hollow profile 1, after which the expansion dipping takes place.
  • the hollow profile 1 on its remaining circumference to be expanded from the internal high-pressure forming tool 10 controlled while expanding evasive to the outside through the support stamp 18, this must be designed with a bowl-shaped end face 19, supported.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
EP98107665A 1997-05-09 1998-04-28 Procédé et dispositif de fabrication de profilés creux bombés Expired - Lifetime EP0876860B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19719628A DE19719628C2 (de) 1997-05-09 1997-05-09 Verfahren und Einrichtung zur Herstellung von ausgebauchten Hohlprofilen
DE19719628 1997-05-09

Publications (3)

Publication Number Publication Date
EP0876860A2 true EP0876860A2 (fr) 1998-11-11
EP0876860A3 EP0876860A3 (fr) 2000-10-11
EP0876860B1 EP0876860B1 (fr) 2002-12-18

Family

ID=7829106

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98107665A Expired - Lifetime EP0876860B1 (fr) 1997-05-09 1998-04-28 Procédé et dispositif de fabrication de profilés creux bombés

Country Status (3)

Country Link
EP (1) EP0876860B1 (fr)
DE (2) DE19719628C2 (fr)
ES (1) ES2187853T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102107240B (zh) * 2009-12-25 2012-11-07 中国科学院金属研究所 一种简易的管材液压胀形装置及胀形方法
CN103801593A (zh) * 2012-12-21 2014-05-21 常州先进制造技术研究所 用于汽车后桥的整形出模装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005036419B4 (de) * 2005-07-29 2015-05-21 Tower Automotive Hydroforming Gmbh & Co. Kg Vorrichtung zur Herstellung ausgebauchter Hohlprofile, insbesondere von Gasgeneratorgehäusen für Airbageinrichtungen
DE102006012625C5 (de) * 2006-03-20 2010-06-17 Audi Ag Verfahren zur Herstellung von Profilen

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1501023A (en) * 1920-08-25 1924-07-08 Gen Motors Corp Process and apparatus for forming metal objects
JPS4832903B1 (fr) * 1968-02-23 1973-10-09
JPS5838256B2 (ja) * 1980-01-08 1983-08-22 工業技術院長 自動車用アクスル・ハウジングの製造方法
IT1240233B (it) * 1990-02-02 1993-11-27 Europa Metalli Lmi Procedimento per la realizzazione di elementi monolitici cavi in materiale metallico
US5070717A (en) * 1991-01-22 1991-12-10 General Motors Corporation Method of forming a tubular member with flange
DE4201819A1 (de) * 1991-01-28 1992-07-30 Mannesmann Ag Verfahren und vorrichtung zum hydraulischen aufweiten von rohrfoermigen hohlprofilen
DE69403722T2 (de) * 1993-04-19 1997-09-25 Gen Motors Corp Verfahren zum Formen eines rohrförmigen Elementes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102107240B (zh) * 2009-12-25 2012-11-07 中国科学院金属研究所 一种简易的管材液压胀形装置及胀形方法
CN103801593A (zh) * 2012-12-21 2014-05-21 常州先进制造技术研究所 用于汽车后桥的整形出模装置
CN103801593B (zh) * 2012-12-21 2015-09-30 常州先进制造技术研究所 用于汽车后桥的整形出模装置

Also Published As

Publication number Publication date
ES2187853T3 (es) 2003-06-16
EP0876860B1 (fr) 2002-12-18
EP0876860A3 (fr) 2000-10-11
DE19719628A1 (de) 1998-11-12
DE19719628C2 (de) 2000-07-06
DE59806669D1 (de) 2003-01-30

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