EP0771598A1 - Procédé pour diminuer le frottement lors du formage hydraulique par haute pression interne et dispositif pour le formage hydraulique - Google Patents

Procédé pour diminuer le frottement lors du formage hydraulique par haute pression interne et dispositif pour le formage hydraulique Download PDF

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Publication number
EP0771598A1
EP0771598A1 EP95117680A EP95117680A EP0771598A1 EP 0771598 A1 EP0771598 A1 EP 0771598A1 EP 95117680 A EP95117680 A EP 95117680A EP 95117680 A EP95117680 A EP 95117680A EP 0771598 A1 EP0771598 A1 EP 0771598A1
Authority
EP
European Patent Office
Prior art keywords
pressure
workpiece
forming
tool
hydraulic forming
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.)
Pending
Application number
EP95117680A
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German (de)
English (en)
Inventor
E. Olszewski
R. Hansen
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.)
Benteler Deustchland GmbH
Original Assignee
Benteler Deustchland GmbH
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 Benteler Deustchland GmbH filed Critical Benteler Deustchland GmbH
Priority to EP95117680A priority Critical patent/EP0771598A1/fr
Publication of EP0771598A1 publication Critical patent/EP0771598A1/fr
Pending 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
    • B21D26/047—Mould construction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/18—Lubricating, e.g. lubricating tool and workpiece simultaneously

Definitions

  • the invention relates on the one hand to a method for reducing the friction between the outer surface of a workpiece to be formed by means of hydraulic internal pressure and the forming surface of a press tool and on the other hand to a device for the hydraulic forming of a tubular hollow body.
  • Hydraulic shaping by means of internal high pressure is used when forming at least partially hollow, metallic workpieces in presses.
  • the workpieces are usually tubular hollow bodies.
  • the method is characterized in that the optionally preformed workpiece is placed in a press tool which has the shape of the workpiece to be produced. The press tool is then closed. The front ends of the hollow body are then sealed and the workpiece is filled with a liquid, the workpiece being supplied with increasing pressure. Under the pressure of the liquid and at the same time pushing the front ends of the workpiece, the workpiece enters a plastic state. The wall sections of the workpiece then begin to deform and take on the shape predetermined by the press tool by the workpiece resting against the inner surfaces of the press tool.
  • the object of the invention is to expand the field of application of hydraulic forming by means of internal high pressure and to make it more efficient overall, the forming of longer workpieces in particular being simplified.
  • the invention further relates to a device for hydraulic forming, in which the frictional relationships between the workpiece and the tool are improved during the forming.
  • the procedural part of this object is achieved in that a lubricant is introduced at least in regions between the workpiece and the tool during the forming process with an adjustable pressure and is distributed along the contact surfaces of the workpiece and the tool.
  • This defined lubrication pressure can be specified in particular in the areas of the largest deformation.
  • the lubricant is expediently distributed over the entire surface of the tool or workpiece, so that the contact surfaces are provided with a uniform lubricating film. As a result, the forces required for the reloading operations are reduced. At the same time, the forces for deflecting the workpiece in the tool are reduced.
  • Another advantage is that the life of the tool is extended.
  • the invention enables a significantly simpler setting and control of the technological parameters in the course of the forming.
  • the force of the tool and the liquid pressure result in such a tension state that guarantees that a deformation takes place without bursting and that the formation of folds and overlaps is avoided. This ensures a high quality of the finished formed parts with reduced energy consumption.
  • the lubricant pressure can be controlled as a function of the forming pressure.
  • the fluid pressure in the workpiece is controlled in such a way that the entire length of the workpiece rests on the cavity of the press tool. Together with the axial forces acting on the end faces of the workpiece, the material flows into the contour of the press tool. At the same time, the internal pressure must prevent the formation of folds during axial feeding. In the course of the forming process, the pressure size is therefore regulated depending on the replenishment path of the forehead. Coupled with this, depending on the forming pressure, a defined lubrication pressure is built up statically and the lubricant is distributed along the contact surfaces of the workpiece and tool. The logical combination of forming pressure and lubricating pressure means that the most favorable, coordinated process parameters are available in each forming stage.
  • a further advantageous embodiment provides for the lubricant to be specified at a constant pressure. This simplifies it the control structure of a system, wherein the advantages according to the invention and described above are also realized.
  • a device According to this, at least one lubrication pocket is provided in the forming surface of the press tool, via which a static lubricating pressure can be built up between the hollow body to be deformed and the forming surface.
  • a lubrication pocket can already suffice for the specification of the lubrication pressure.
  • a plurality of lubrication pockets are advantageously arranged distributed in the forming surface. The dimensions and shape of the lubrication pockets are such that the desired contour of the deformed workpiece is not impaired.
  • the lubrication pockets are designed as a circumferential groove adapted to the die contour.
  • the lubricant can thus be distributed evenly along the forming surface of the press tool.
  • a supply line to the lubrication pocket is sufficient for the lubricant supply.
  • the device according to the invention ensures optimized frictional relationships between the workpiece and the tool during the deformation. This not only enables the shaping of longer workpieces that require larger re-feeding processes, but also the shaping of workpieces from materials with lower deformability. Accordingly, hollow bodies can also are successfully deformed from alloyed steels that are otherwise not or only partially suitable for hydraulic forming. Furthermore, the device according to the invention is characterized by a longer service life of the press tool.
  • FIG. 1 shows a technically schematic and not to scale the lower part 1 of a press tool 2, which is otherwise not shown in detail, in a top view.
  • the lower part 1 has a recess 3 which is adapted to the contour of the workpiece to be formed. Together with a recess which is matched to this, it forms a die for the workpiece to be produced in the upper part of the press tool 2 (not shown).
  • the die has the shape of the finished workpiece.
  • the lubrication pockets 5 are designed as grooves 6 adapted to the contour of the forming surface 4. Corresponding grooves are provided in the upper part of the press tool 2, so that circumferential lubrication pockets are formed.
  • the lubrication pockets 5 are supplied with lubricant via channels 7 integrated in the lower part 1.
  • a preformed tubular hollow body 8 is indicated in dashed lines in FIG. After this has been inserted into the lower part 1, the press tool 2 is closed. In the next phase the hollow body 8 is filled with a sealed end 9 with a liquid and subjected to an increasing pressure. The material of the hollow body 8 reaches a plastic state through controlled fluid pressure within the hollow body 8 with simultaneous axial pushing of the ends 9. Its wall rests on the forming surfaces of the die, creating the desired shape. Depending on the deformation, the length of the hollow body 8 is shortened.
  • the pushing process of the ends 9 is characterized by the arrows F. Basically, it does not have to be pushed on both sides.
  • a defined lubrication pressure is specified during the forming process and is controlled as a function of the forming pressure.
  • the lubrication pressure can also be specified constantly.
  • the lubrication pressure is built up statically at the locations specified by the lubrication pockets 5 and distributed along the contact surfaces 10, 11 in the gap Sp between the hollow body 8 to be deformed and the forming surface 4. This reduces the forces required for the feeding and deflection processes. This also enables a more precise coordination of the mutually influencing technological parameters during the forming process. Wrinkling or cracking is thus counteracted.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
EP95117680A 1995-11-09 1995-11-09 Procédé pour diminuer le frottement lors du formage hydraulique par haute pression interne et dispositif pour le formage hydraulique Pending EP0771598A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95117680A EP0771598A1 (fr) 1995-11-09 1995-11-09 Procédé pour diminuer le frottement lors du formage hydraulique par haute pression interne et dispositif pour le formage hydraulique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95117680A EP0771598A1 (fr) 1995-11-09 1995-11-09 Procédé pour diminuer le frottement lors du formage hydraulique par haute pression interne et dispositif pour le formage hydraulique

Publications (1)

Publication Number Publication Date
EP0771598A1 true EP0771598A1 (fr) 1997-05-07

Family

ID=8219799

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95117680A Pending EP0771598A1 (fr) 1995-11-09 1995-11-09 Procédé pour diminuer le frottement lors du formage hydraulique par haute pression interne et dispositif pour le formage hydraulique

Country Status (1)

Country Link
EP (1) EP0771598A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1197273A1 (fr) * 2000-10-10 2002-04-17 Sidmar N.V. Dispositif et méthode pour la déformation mécanique, hydromécanique ou hydraulique
WO2005092534A1 (fr) * 2004-03-20 2005-10-06 Amborn, Peter Procede pour façonner un corps creux metallique dans un outil de façonnage a une temperature elevee et avec une pression interieure
DE10357341B4 (de) * 2003-12-09 2006-02-09 Daimlerchrysler Ag Vorrichtung und Verfahren zur Innenhochdruckumformung eines Rohlings
CN103551472A (zh) * 2013-10-25 2014-02-05 南京航空航天大学 一种空心叶片推弯成形工艺
CN112496138A (zh) * 2020-11-09 2021-03-16 保隆(安徽)汽车配件有限公司 一种内高压成型模具以及工件的成型方法
CN118143114A (zh) * 2024-05-09 2024-06-07 南通大岛康晟科技有限公司 一种高压三通加工用一体化成型装置及成型工艺
CN118143114B (zh) * 2024-05-09 2024-07-02 南通大岛康晟科技有限公司 一种高压三通加工用一体化成型装置及成型工艺

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2418599A1 (de) * 1974-04-18 1975-10-30 Maschf Augsburg Nuernberg Ag Verfahren und vorrichtung zum herstellen von druckwerkswalzen fuer rotationsdruckmaschinen
DE2440725A1 (de) * 1974-08-24 1976-03-11 Berg Kg Vorrichtung zum kaltformen von hohlkoerpern
DE2261955B2 (de) * 1972-12-18 1979-07-26 Smg Sueddeutsche Maschinenbau-Gesellschaft Mbh, 6833 Waghaeusel Vorrichtung zum hydromechanischen Stülpziehen von Spültischen
EP0512131A2 (fr) * 1989-06-19 1992-11-11 Aluminum Company Of America Appareil et procédé de lubrification et de refroidissement dams une presse d'étirage profond et de repassage
EP0562609A1 (fr) * 1992-03-26 1993-09-29 S + S ELECTRONIC GmbH & Co. KG Appareil de lubrification par pulvérisation pour presser automatiques à estamper

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2261955B2 (de) * 1972-12-18 1979-07-26 Smg Sueddeutsche Maschinenbau-Gesellschaft Mbh, 6833 Waghaeusel Vorrichtung zum hydromechanischen Stülpziehen von Spültischen
DE2418599A1 (de) * 1974-04-18 1975-10-30 Maschf Augsburg Nuernberg Ag Verfahren und vorrichtung zum herstellen von druckwerkswalzen fuer rotationsdruckmaschinen
DE2440725A1 (de) * 1974-08-24 1976-03-11 Berg Kg Vorrichtung zum kaltformen von hohlkoerpern
EP0512131A2 (fr) * 1989-06-19 1992-11-11 Aluminum Company Of America Appareil et procédé de lubrification et de refroidissement dams une presse d'étirage profond et de repassage
EP0562609A1 (fr) * 1992-03-26 1993-09-29 S + S ELECTRONIC GmbH & Co. KG Appareil de lubrification par pulvérisation pour presser automatiques à estamper

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1197273A1 (fr) * 2000-10-10 2002-04-17 Sidmar N.V. Dispositif et méthode pour la déformation mécanique, hydromécanique ou hydraulique
DE10357341B4 (de) * 2003-12-09 2006-02-09 Daimlerchrysler Ag Vorrichtung und Verfahren zur Innenhochdruckumformung eines Rohlings
WO2005092534A1 (fr) * 2004-03-20 2005-10-06 Amborn, Peter Procede pour façonner un corps creux metallique dans un outil de façonnage a une temperature elevee et avec une pression interieure
US7810367B2 (en) 2004-03-20 2010-10-12 Karl Kipry Method of shaping a metallic hollow member in a shaping tool at increased temperature and under internal pressure
CN103551472A (zh) * 2013-10-25 2014-02-05 南京航空航天大学 一种空心叶片推弯成形工艺
CN103551472B (zh) * 2013-10-25 2015-09-09 南京航空航天大学 一种空心叶片推弯成形工艺
CN112496138A (zh) * 2020-11-09 2021-03-16 保隆(安徽)汽车配件有限公司 一种内高压成型模具以及工件的成型方法
CN118143114A (zh) * 2024-05-09 2024-06-07 南通大岛康晟科技有限公司 一种高压三通加工用一体化成型装置及成型工艺
CN118143114B (zh) * 2024-05-09 2024-07-02 南通大岛康晟科技有限公司 一种高压三通加工用一体化成型装置及成型工艺

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