WO1999025505A2 - Verfahren und vorrichtung zur verminderung der wandreibung beim innenhochdruck-umformungsprozess - Google Patents
Verfahren und vorrichtung zur verminderung der wandreibung beim innenhochdruck-umformungsprozess Download PDFInfo
- Publication number
- WO1999025505A2 WO1999025505A2 PCT/DE1998/003357 DE9803357W WO9925505A2 WO 1999025505 A2 WO1999025505 A2 WO 1999025505A2 DE 9803357 W DE9803357 W DE 9803357W WO 9925505 A2 WO9925505 A2 WO 9925505A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hollow body
- pressure
- die
- generating system
- internal pressure
- Prior art date
Links
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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/18—Lubricating, e.g. lubricating tool and workpiece simultaneously
-
- 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
Definitions
- the invention relates to a method for reducing the wall friction during the internal high-pressure forming process, in particular when expanding it according to the preamble of patent claim 1.
- the hydroforming process is used to shape (expand) hollow bodies using hydraulic active media.
- material In order to avoid or to keep a wall thickness reduction in the area of the molding, which is usually not desired, material must be axially fed from the area of the hollow body that is not to be shaped into the forming zones.
- this tracking is limited by the wall friction between the inner surface of the die enclosing the hollow body and the outer surface of the hollow body as a result of the high internal pressure.
- the size of the wall friction generated during axial tracking is dependent on the level of the internal pressure, the length and shape of the tracking section and the friction pairing of the two surfaces sliding relative to one another.
- the object of the invention is to provide a method for reducing the wall friction in the hydroforming process, in particular when expanding Specify with which a controlled axial tracking of material is possible even with longer tracking distances.
- the area of the hollow body that is not to be reshaped is pressurized on the circumference.
- the application can take place both in forming and in
- Axial direction take place over several sections.
- This pressure is preferably less than or equal to the internal pressure for the molding. Furthermore, it can be advantageous if the pressure in the axially spaced sections is different.
- the proposed measure brings about a quasi hydrostatic bearing in this area, so that the wall friction is significantly reduced.
- the opening is formed by a small hole. It is more advantageous to design the opening as a pocket.
- the pressure generating system can be the existing system for generating the internal high pressure, but can also be a separate system.
- the pockets of one section can be connected to the internal high-pressure generation system and the axially spaced-apart pockets can be connected to a separate system.
- the pressure control can take place, for example, via throttle elements arranged in the lines.
- the pressure effective pocket area may vary of the pressure difference should not be too large, since otherwise material of the hollow body can be pressed into the pockets during the final calibration.
- the rounding of the edges of the pockets must be selected so that, on the one hand, no undesired markings occur on the hollow body and, on the other hand, the specified leakage rate is not exceeded and the desired pressure build-up is achieved.
- Figure 2 shows a section in the direction A-A in Figure 1
- FIG. 1 shows a device according to the invention for internal high pressure molding of a hollow body 1 in a longitudinal section and in FIG. 2 in a cross section in a very simplified manner.
- the hollow body 1 to be reshaped is inserted in a die having two die halves 2, 3 and is to be provided with a molding 7 which widens in accordance with the contour 15, 15 'of the two die halves 2, 3 in the end region lying here on the left.
- the final state of the hollow body 1 after the internal high pressure forming is shown with dashed lines.
- both open ends of the hollow body 1 are sealed in a known manner with sealing elements 4, 5, the sealing element 5 lying on the right here at the same time also being a feed device, such as the
- axially pockets 11, 11 ', 12, 12' are preferably arranged on the inside in both die halves 2, 3.
- Each of these pockets 11, 11 ', 12, 12' is connected to a pressure generating system via a line 13, 13 ', 14, 14'.
- This can be the internal high-pressure generation system, not shown here, or a separate system.
- the size of the reduction in wall friction can be influenced by the number of pockets 11, 11 ', 12, 12', which are arranged in the circumferential direction and axially spaced apart.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU21483/99A AU2148399A (en) | 1997-11-14 | 1998-11-11 | Method and device for reducing the wall friction during an internal high pressure forming process |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1997151413 DE19751413C2 (de) | 1997-11-14 | 1997-11-14 | Verfahren und Vorrichtung zur Verminderung der Wandreibung beim Innenhochdruck-Umformungsprozess |
DE19751413.8 | 1997-11-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1999025505A2 true WO1999025505A2 (de) | 1999-05-27 |
WO1999025505A3 WO1999025505A3 (de) | 1999-08-12 |
Family
ID=7849292
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1998/003357 WO1999025505A2 (de) | 1997-11-14 | 1998-11-11 | Verfahren und vorrichtung zur verminderung der wandreibung beim innenhochdruck-umformungsprozess |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2148399A (de) |
DE (1) | DE19751413C2 (de) |
WO (1) | WO1999025505A2 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102225441A (zh) * | 2011-03-22 | 2011-10-26 | 初冠南 | 一种轴向补料的工艺方法 |
CN103920788A (zh) * | 2014-04-03 | 2014-07-16 | 南京航空航天大学 | 局部大变形空心件的差压成形方法 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19830623B4 (de) * | 1998-07-09 | 2005-04-28 | Forschungsges Umformtechnik | Verfahren und Vorrichtung zur Umformung von Werkstücken, insbesondere von Hohlkörpern, durch Einwirkung eines Druckmediums |
EP1197273A1 (de) * | 2000-10-10 | 2002-04-17 | Sidmar N.V. | Vorrichtung und Verfahren zur mechanischen, hydromechanischen oder hydraulischen Umformung |
DE10337398A1 (de) * | 2003-08-13 | 2005-03-17 | Forschungsgesellschaft Umformtechnik Mbh | Vorrichtung zum Innenhochdruckumformen |
EP1586393B1 (de) | 2004-04-16 | 2007-09-19 | Impress Group B.V. | Verfahren zum Umformen von Behälterkörpern und Vorrichtung zur Durchführung des Verfahrens |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1777181A1 (de) * | 1968-09-18 | 1971-03-18 | Masanobu Nakamura | Ausbuchtvorrichtung |
GB2057322A (en) * | 1979-08-28 | 1981-04-01 | Mannesmann Ag | Process and apparatus for the formation of hollow objects having varying cross section |
US4513598A (en) * | 1982-01-27 | 1985-04-30 | Costabile John J | Method and apparatus for producing a bulge in thin metal material |
EP0347369A2 (de) * | 1988-06-16 | 1989-12-20 | MANNESMANN Aktiengesellschaft | Verfahren und Vorrichtung zum hydraulischen Aufweiten von Hohlprofilen |
EP0439764A2 (de) * | 1990-02-02 | 1991-08-07 | EUROPA METALLI - LMI S.p.A. | Verfahren zur Herstellung von hohlen, einteiligen, metallischen Werkstücken |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19516064C2 (de) * | 1995-05-04 | 1998-01-29 | Rasselstein Ag | Verfahren zur Herstellung eines Blechbehälters mit im wesentlichen bauchiger Form |
-
1997
- 1997-11-14 DE DE1997151413 patent/DE19751413C2/de not_active Expired - Fee Related
-
1998
- 1998-11-11 WO PCT/DE1998/003357 patent/WO1999025505A2/de active Application Filing
- 1998-11-11 AU AU21483/99A patent/AU2148399A/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1777181A1 (de) * | 1968-09-18 | 1971-03-18 | Masanobu Nakamura | Ausbuchtvorrichtung |
GB2057322A (en) * | 1979-08-28 | 1981-04-01 | Mannesmann Ag | Process and apparatus for the formation of hollow objects having varying cross section |
US4513598A (en) * | 1982-01-27 | 1985-04-30 | Costabile John J | Method and apparatus for producing a bulge in thin metal material |
EP0347369A2 (de) * | 1988-06-16 | 1989-12-20 | MANNESMANN Aktiengesellschaft | Verfahren und Vorrichtung zum hydraulischen Aufweiten von Hohlprofilen |
EP0439764A2 (de) * | 1990-02-02 | 1991-08-07 | EUROPA METALLI - LMI S.p.A. | Verfahren zur Herstellung von hohlen, einteiligen, metallischen Werkstücken |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102225441A (zh) * | 2011-03-22 | 2011-10-26 | 初冠南 | 一种轴向补料的工艺方法 |
CN103920788A (zh) * | 2014-04-03 | 2014-07-16 | 南京航空航天大学 | 局部大变形空心件的差压成形方法 |
Also Published As
Publication number | Publication date |
---|---|
DE19751413A1 (de) | 1999-06-02 |
DE19751413C2 (de) | 2000-06-08 |
WO1999025505A3 (de) | 1999-08-12 |
AU2148399A (en) | 1999-06-07 |
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