WO2004103602A1 - Verfahren zur herstellung eines umfänglich geschlossenen hohlprofils - Google Patents
Verfahren zur herstellung eines umfänglich geschlossenen hohlprofils Download PDFInfo
- Publication number
- WO2004103602A1 WO2004103602A1 PCT/EP2004/004301 EP2004004301W WO2004103602A1 WO 2004103602 A1 WO2004103602 A1 WO 2004103602A1 EP 2004004301 W EP2004004301 W EP 2004004301W WO 2004103602 A1 WO2004103602 A1 WO 2004103602A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- blank
- trimming
- hollow profile
- internal high
- way
- 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
- 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
- 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
- B21D26/053—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 characterised by the material of the blanks
Definitions
- the invention relates to a method for producing a circumferentially closed hollow profile according to the preamble of patent claim 1.
- a generic method is known from WO 98/43758 AI.
- a hollow profile blank of uniform cross-section is inserted into an internal high-pressure forming tool, the engraving of which is related to of the blank has a reduced cross section in the area between the ends thereof.
- the inserted hollow profile blank is squeezed in this area during the closing process of the forming tool.
- the resultant retraction of the hollow profile blank manifests itself in an inclined position or a deformation of the end of the blank which is rectilinear at the beginning of the production process and with the end face perpendicular to the longitudinal extension of the blank.
- the axial stamps provided with a conical sealing area and then docking onto the blank ends can only inadequately seal the blank from the internal high pressure to be generated later.
- the subsequent expansion process of the blank by means of the high fluid pressure is not completely reliable and so that the hollow profile cannot be produced as desired.
- the invention has for its object to develop a generic method in such a way that even with strong crushing deformations of the hollow profile blank, which result when the forming tool is closed, a process-reliable production of the hollow profile is made possible.
- the invention is based on the finding that the deformations that occur when the blank is squeezed can be compensated for by a targeted cutting of the blank ends.
- the end faces of the ends are flat after being squeezed and with the forming tool completely closed, and are aligned as far as possible perpendicular to the longitudinal extent of the blank.
- the axial punches can dock onto these ends as if the blank had not been trimmed and had not previously been subjected to any crushing.
- the axial punches can thus sufficiently seal the blank at both ends against the internal high pressure that is still to be produced, which enables a process-reliable production of the hollow profile.
- the invention In addition, a cutting collision of the axial ram and the blank otherwise provided with tilted end faces is avoided by the invention, the chips and flags formed thereby having to be removed in a complex manner during a reworking operation after removal of the finished hollow profile.
- This removal is usually associated with a severing of the sealing sections of the blank ends, so that, according to the invention, such a trimming operation can be dispensed with, in addition to the labor savings, which is expensive to dispose of material waste.
- the planning in advance of a lost additional length of the blank is no longer necessary, as a result of which, due to the shorter length of the blank, the friction between the blank and the forming tool to be overcome in the subsequent expansion of the blank by means of internal high pressure is considerably reduced.
- the ends of the blank are trimmed in such a way that the end faces of the ends are beveled in relation to the central axis lying in the squeezing direction and extending transversely to the longitudinal axis of the blank.
- This trimming form results from the additional knowledge that the deformations of the blank which arise as a result of the squeezing as a function of the squeezing direction lead to an oblique position of the raw end cross section and thus the end face to the axis mentioned, so that the pipe ends are beveled in the opposite direction in the sense of the invention become.
- an upper circumferential region of the pipe end projects beyond its lower circumferential region in the axial direction.
- the blank ends are trimmed such that their end faces remain arranged parallel to one another.
- the end face of one uncut end is tilted upward, so that the lower circumferential area axially projects beyond the upper circumferential area of the end, and the end face of the other untrimmed end tilted downward, the upper peripheral region of the end projecting beyond the lower peripheral region in the axial direction.
- the blank can therefore before the crimping process at both ends under the same Angle cut in the opposite direction of the tilt.
- the resulting uniformity of the trimming makes the cutting process easier.
- the same also applies to a lateral offset of the ends after the pinching has taken place.
- a particularly preferred embodiment of the invention is, according to claim 4, the special determination of the bevel angle of the bleed, which lies in a range between 6 ° and 10 °, preferably 8 °.
- the tilt of the end faces which is caused by the squeezing deformation, is almost always in this angular range, so that in the opposite direction an equally large bevel angle of the end face of the end is provided when trimming got to.
- the end deformation actually occurring as a result of the later squeezing process is determined in a computer simulation, in particular a finite element simulation, and then an optimal snowmaking is used to compensate for the deformation - Contour contour and an optimal bevel angle of the trimming to be carried out.
- the bevel angle and circumference contour suitable for each component and for each type of crushing can be determined individually with relatively little effort and without the use of numerous, laborious, empirical studies.
- the ends are trimmed in two dimensions.
- the exact spatial contour of the blank end is indeed not recorded, however such trimming can be carried out quickly and particularly economically.
- the ends are trimmed in a three-dimensional contour cut. This can be done, for example, by means of a cutting laser and offers the axially docking axial punch the best possible connection surface, so that an optimal seal is achieved by means of the punch.
- FIG. 1 is a side half section of a hollow profile blank trimmed on both sides according to the invention in an open forming tool
- Fig. 2 in a side half-section of the hollow profile blank from Figure 1 after the squeezing process with closed internal high pressure forming tool.
- an internal high pressure forming tool 1 which consists of an upper part 2 and a lower part 3.
- the tool engraving 4, which is formed by both tool parts 2 and 3 and delimits a molding space for a hollow profile blank 5 inserted and to be formed in the tool 1, is designed such that one end 6 of the engraving 4 is arranged offset in height from the other end 7. These two ends 6 and 7 of the engraving 4 have approximately the same diameter in the closed forming tool 1 according to FIG. 2 as the inserted hollow profile blank 5.
- the engraving 4 is in a central region 8 which connects the two ends 6 and 7 to one another significantly reduced in cross-section.
- the hollow profile blank 5 in turn has at its two ends 9 and 10 an end face 12 and 13 inclined in the direction of the longitudinal axis 11 of the hollow profile blank 5.
- the hollow profile blank 5 in which the end faces 12 and 13 of its ends 9 and 10 are arranged parallel to one another, is located entirely within the engraving 4 of the forming tool 1.
- the taper angle of the end face 12 or 13 to the central vertical axis 18 is 8 °.
- the ends 9 and 10 of the blank 5 are first trimmed in such a way that beveled end faces 12 and 13 result, these should be beveled as far as possible to the axis lying in the squeezing direction in order to obtain an optimal deformation result which results from the squeezing process and to ensure a clean seal of the axial ram that will later dock for internal high pressure forming.
- the blank ends 9 and 10 are trimmed in such a way that their end faces 12 and 13 remain parallel to one another.
- the deformation of the ends 9 and 10 caused by the later squeezing process is determined in a finite element computer simulation and then the suitable trimming contour and the suitable bevel angle are calculated from this.
- the so truncated hollow profile blank 5 is now inserted 'into the impression 4 of the forming die 1, after which this is closed. Due to the central region 8 constricting the engraving 4, in the closing process of the forming tool 1, the upper partly 2 and the lower part 3 a pinch of the hollow profile blank 5.
- the central pinch 19, which can be seen from FIG. 2, which shows the forming tool 1 in its closed state, has an effect on the ends 9 and 10 of the hollow profile blank 5 in this way that the end faces 12 and 13 of the blank 5 are perpendicular to its longitudinal extent.
- the axial punches are then moved up to the ends 9 and 10 of the hollow profile blank 5 and seal them with a conical sealing area.
- a pressure fluid is now introduced into the hollow profile blank 5 via the axial rams and placed under high pressure. Due to the existing internal high pressure, the hollow profile blank 5 is widened, whereby it lies completely against the engraving 4 of the forming tool 1. The pressure fluid is now released and led out of the now fully formed hollow profile, after which the axial rams are moved back by the forming tool 1. Finally, this is opened and the hollow profile is removed from the engraving 4.
- the invention has the significant advantage that the straight position of the end faces 12, 13 enables a homogeneous force introduction of the axial punches into the forming area of the internal high-pressure forming process that is to be bulged out, which contributes extraordinarily to the process reliability of the forming process due to the avoidance of undesired wrinkle formation and material thickening based thereon ,
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/559,165 US20060248933A1 (en) | 2003-05-24 | 2004-04-23 | Method for producing a peripherally closed hollow profield element |
DE112004000725T DE112004000725D2 (de) | 2003-05-24 | 2004-04-23 | Verfahren zur Herstellung eines umfänglich geschlossenen Hohlprofils |
DE502004003973T DE502004003973D1 (de) | 2003-05-24 | 2004-04-23 | Verfahren zur herstellung eines umfänglich geschlossenen hohlprofils |
CA002526774A CA2526774A1 (en) | 2003-05-24 | 2004-04-23 | Method for producing a peripherally closed hollow profiled element |
JP2006529701A JP2006528075A (ja) | 2003-05-24 | 2004-04-23 | 周囲を密封して中空断面要素を製造するための方法 |
EP04729065A EP1628788B1 (de) | 2003-05-24 | 2004-04-23 | Verfahren zur herstellung eines umfänglich geschlossenen hohlprofils |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10323738.0 | 2003-05-24 | ||
DE10323738A DE10323738B3 (de) | 2003-05-24 | 2003-05-24 | Verfahren zur Herstellung eines umfänglich geschlossenen Hohlprofils |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004103602A1 true WO2004103602A1 (de) | 2004-12-02 |
Family
ID=33305223
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2004/004301 WO2004103602A1 (de) | 2003-05-24 | 2004-04-23 | Verfahren zur herstellung eines umfänglich geschlossenen hohlprofils |
Country Status (6)
Country | Link |
---|---|
US (1) | US20060248933A1 (de) |
EP (1) | EP1628788B1 (de) |
JP (1) | JP2006528075A (de) |
CA (1) | CA2526774A1 (de) |
DE (3) | DE10323738B3 (de) |
WO (1) | WO2004103602A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW201114521A (en) * | 2009-10-29 | 2011-05-01 | Metal Ind Res & Dev Ct | Method of forming and manufacturing U-shaped metal tube support frame |
CN114653806B (zh) * | 2022-03-01 | 2023-12-22 | 哈尔滨工业大学(威海) | 一种用于高强钢变径管状件的预成型方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4320237C1 (de) * | 1993-06-18 | 1994-08-18 | Schaefer Maschbau Wilhelm | Verfahren und Vorrichtung zum Herstellen eines Hohlkörpers nach dem Innenhochdruckverfahren |
US5735156A (en) * | 1994-09-20 | 1998-04-07 | Hitachi, Ltd. | Method and apparatus for forming a non-circular pipe |
WO1998043758A1 (en) * | 1997-03-27 | 1998-10-08 | T I Corporate Services Limited | Method and apparatus for forming of tubing |
EP1015149B1 (de) * | 1997-07-18 | 2003-01-29 | Cosma International Inc. | Innenhochdruckformung eines rohrförmigen rohlings mit ovalem querschnitt, sowie innenhochdruckumformvorrichtung |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE645954A (de) * | 1963-03-28 | |||
USRE33990E (en) * | 1987-05-06 | 1992-07-14 | Ti Corporate Services Limited | Method of forming box-like frame members |
US5644829A (en) * | 1993-08-16 | 1997-07-08 | T I Corporate Services Limited | Method for expansion forming of tubing |
US5557961A (en) * | 1995-11-13 | 1996-09-24 | General Motors Corporation | Hydroformed structural member with varied wall thickness |
DE19882390B4 (de) * | 1997-05-12 | 2010-02-18 | Dana Automotive Systems Group, LLC, Toledo | Hydroformverfahren |
DE19813012C2 (de) * | 1998-03-25 | 2002-08-01 | Daimler Chrysler Ag | Verfahren zum Herstellen eines Hohlkörpers aus einem rohrförmigen Rohling durch Innenhochdruckformung |
US6065502A (en) * | 1998-10-07 | 2000-05-23 | Cosma International Inc. | Method and apparatus for wrinkle-free hydroforming of angled tubular parts |
JP3854812B2 (ja) * | 2001-03-27 | 2006-12-06 | 新日本製鐵株式会社 | 自動車用強度部材 |
EP1389497A4 (de) * | 2001-05-22 | 2009-04-29 | Mitsubishi Motors Corp | Hochdruckumformungsverfahren und hochdruckumformungsprodukt hergestellt durch dieses verfahren |
-
2003
- 2003-05-24 DE DE10323738A patent/DE10323738B3/de not_active Expired - Fee Related
-
2004
- 2004-04-23 DE DE502004003973T patent/DE502004003973D1/de not_active Expired - Lifetime
- 2004-04-23 JP JP2006529701A patent/JP2006528075A/ja not_active Withdrawn
- 2004-04-23 WO PCT/EP2004/004301 patent/WO2004103602A1/de active IP Right Grant
- 2004-04-23 DE DE112004000725T patent/DE112004000725D2/de not_active Expired - Fee Related
- 2004-04-23 US US10/559,165 patent/US20060248933A1/en not_active Abandoned
- 2004-04-23 EP EP04729065A patent/EP1628788B1/de not_active Expired - Lifetime
- 2004-04-23 CA CA002526774A patent/CA2526774A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4320237C1 (de) * | 1993-06-18 | 1994-08-18 | Schaefer Maschbau Wilhelm | Verfahren und Vorrichtung zum Herstellen eines Hohlkörpers nach dem Innenhochdruckverfahren |
US5735156A (en) * | 1994-09-20 | 1998-04-07 | Hitachi, Ltd. | Method and apparatus for forming a non-circular pipe |
WO1998043758A1 (en) * | 1997-03-27 | 1998-10-08 | T I Corporate Services Limited | Method and apparatus for forming of tubing |
EP1015149B1 (de) * | 1997-07-18 | 2003-01-29 | Cosma International Inc. | Innenhochdruckformung eines rohrförmigen rohlings mit ovalem querschnitt, sowie innenhochdruckumformvorrichtung |
Also Published As
Publication number | Publication date |
---|---|
EP1628788A1 (de) | 2006-03-01 |
EP1628788B1 (de) | 2007-05-30 |
DE10323738B3 (de) | 2004-11-18 |
US20060248933A1 (en) | 2006-11-09 |
CA2526774A1 (en) | 2004-12-02 |
DE502004003973D1 (de) | 2007-07-12 |
JP2006528075A (ja) | 2006-12-14 |
DE112004000725D2 (de) | 2006-10-19 |
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