US20070209418A1 - Method for Internal High-Pressure Deformation of a Blank - Google Patents
Method for Internal High-Pressure Deformation of a Blank Download PDFInfo
- Publication number
- US20070209418A1 US20070209418A1 US10/582,137 US58213704A US2007209418A1 US 20070209418 A1 US20070209418 A1 US 20070209418A1 US 58213704 A US58213704 A US 58213704A US 2007209418 A1 US2007209418 A1 US 2007209418A1
- Authority
- US
- United States
- Prior art keywords
- receiving space
- blank
- lubricant
- residual fluid
- fluid
- 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
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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
Definitions
- This invention relates to a method for operating an apparatus for hydroforming a blank.
- Hydroforming is becoming increasingly important in the automotive industry in order to allow the production of body components.
- undeformed blanks for example tubes
- the geometry of a receiving space corresponds to the desired external geometry of the finished component.
- the blank is acted on by high-pressure fluid so that the walls of the blank are plastically deformed and come to bear against the walls of the receiving space. It is in this way possible to economically produce high-strength, complex components.
- German document DE 199 44 722 A1 discloses a method for operating a hydroforming die, in which during the deformation of a hollow body which is present in the die, lubricant is delivered into the forming zone of the die via feedlines running inside the forming die and is if appropriate removed again.
- German document DE 102 02 201 A1 discloses a method in which, likewise during the deformation of a hollow body which is present in the forming die, lubricant is delivered into the forming zone of the die via feedlines running inside the forming die and is if appropriate removed again. In this method, however, the feedlines for supplying the lubricant and those used to discharge it are different.
- British document GB 21 26 510 A discloses a production process and an apparatus in which, during the deformation of a hollow profiled section in a hydroforming die, excess pressurized fluid is removed via passages running inside the forming die. To facilitate the deformation, the hollow profiled section is lubricated with pressurized fluid on the outer side.
- German document DE 102 02 201 A1 the principle which is known from European publication EP 0 771 598 A1 is further developed in such a way that a flow of lubricant is generated in the receiving space of the die, so that the deformation process can be assisted even more effectively.
- residual fluid collects in the receiving space.
- This residual fluid may contain high-pressure fluid, lubricants and/or inclusions of air.
- the residual fluid remains in the receiving space and may have an adverse effect on a subsequent deformation process.
- the residual fluid enclosed in the receiving space is substantially not compressible, with the ensuing risk that a blank that is to be deformed cannot adopt the geometry predetermined by the wall of the receiving space during the deformation process and remains undeformed in a region in which residual fluid is present in the receiving space.
- a second problem is that a reliable supply of lubricant is not ensured in those regions of the receiving space in which the residual fluid has collected.
- the object of the present invention is to improve a method of the type referred to above in such a manner that a reproducibly good process quality is ensured.
- residual fluid which is present in the receiving space of die is removed from the receiving space through a passage.
- Lubricant is then fed to the receiving space, and the interior of the blank is supplied with high-pressure fluid.
- This removal of residual fluid can be assisted by the application of subatmospheric pressure or superatmospheric pressure to the passage.
- a low-viscosity lubricant it may be advantageous to use a low-viscosity lubricant, since, compared to high-viscosity lubricants, a low-viscosity lubricant is easier to remove from the receiving space of a die.
- the residual fluid substantially comprises high-pressure fluid but may also include dirt particles, lubricant residues and/or inclusions of air.
- the at least one passage ensures that the receiving space can be drained or vented before a deformation process begins, so that a subsequent deformation process is not affected or disrupted by the presence of residual fluid in the receiving space.
- suction means which can be used to apply a subatmospheric pressure to the passage.
- suction pump which is connected to the at least one passage, so that high-pressure fluid, lubricant residues and/or air can be sucked out of the receiving space.
- a pressure supply can be used to apply superatmospheric pressure to the passage. Therefore, a superatmospheric pressure can be built up in the region where the passage opens out in the receiving space, with the result that residual fluid which is present in the receiving space is forced out of the receiving space through the passage.
- the die may have lines which open out in the receiving space for supplying and/or removing lubricant. These lines may each be suitable for one direction of transport or may be suitable for both directions of transport, i.e. for both supplying and removing lubricant.
- the passage through which residual fluid located in the receiving space can be removed from the receiving space is also suitable for supplying and/or removing lubricant. This allows the die to be of particularly simple configuration, since only at least one passage need be present compared to the use of separate passages and lines.
- FIG. 1 shows a sectional side view of a first hydroforming apparatus during the removal of residual fluid by suction
- FIG. 2 shows the apparatus of FIG. 1 during the supply of lubricant
- FIG. 3 shows a sectional side view of a second hydroforming apparatus during the removal of residual fluid by displacement with lubricant.
- the apparatus which is denoted overall by reference numeral 2 in FIG. 1 , has an upper die half 4 and a lower die half 6 .
- the die halves 4 and 6 delimit a receiving space 8 , the wall 10 of which corresponds to the external geometry of a shaped part which is to be produced.
- FIG. 1 An as yet undeformed, tubular blank 12 has been inserted into the receiving space 8 , the outer skin 14 of which blank 12 comes to bear against the wall 10 of the receiving space 8 during the deformation process.
- the blank 12 may be laterally sealed with the aid of axial cylinders 16 and 18 , the axial cylinder 18 having a line 20 for a high-pressure fluid supply (not shown). High-pressure fluid can be introduced into the cavity of the blank 12 through the line 20 , so that the blank 12 can be deformed.
- the lower die half 6 has three passages 22 , 24 and 26 opening out in the receiving space 10 . These passages are connected to a manifold 28 . Accordingly, the upper die half 4 has passages 30 , 32 and 34 , which likewise open out in the receiving space 8 of the apparatus 2 and lead to a manifold 36 . The manifold 36 of the upper die half 4 and the manifold 28 of the lower die half 6 lead to a common main passage 38 .
- the main passage 38 is connected to suction means (not shown), for example a vacuum pump.
- suction means for example a vacuum pump.
- the residual fluid 40 may comprise high-pressure fluid, residues of lubricants and/or inclusions of air. The removal of the residual fluid 40 allows the receiving space 8 to be drained and vented, so that a subsequent deformation process carried out on the blank 12 is not disrupted by the presence of residual fluid in the receiving space 8 .
- FIG. 2 illustrates the apparatus 2 of FIG. 1 in a subsequent process step.
- the axial cylinders 16 and 18 have been displaced in the direction of the receiving space 8 compared to the position illustrated in FIG. 1 , so that the axial cylinders 16 and 18 bear in a sealing manner against the blank 12 .
- a high-pressure fluid can now be supplied through the line 20 .
- the passages 22 to 38 can be used to feed a lubricant, denoted by 42 , to the receiving space 8 .
- the main passage 38 is coupled to a lubricant supply.
- the lubricant 42 passes into the receiving space 8 in the region where the passages 22 to 26 and 30 to 34 open out.
- FIG. 3 illustrates an apparatus 2 ′ which is similar to the apparatus 2 shown in FIGS. 1 and 2 .
- the reference numerals shown in FIG. 3 are identical where they denote the same components as in the apparatus 2 shown in FIGS. 1 and 2 .
- the lower die half 6 of the apparatus 2 ′ has passages 22 , 24 and 26 which lead to a manifold 28 ′. Residual fluid 40 which is present in the receiving space 8 of the apparatus 2 ′ can be removed through the manifold 28 ′.
- the upper die half 6 of the apparatus 2 ′ has passages 30 , 32 and 34 which lead to a manifold 36 ′. Lubricant 42 can be fed to the receiving space 8 of the apparatus 2 ′ through the manifold 36 ′.
- the manifolds 28 ′ and 36 ′ of the apparatus 2 ′ shown in FIG. 3 are not in communication with one another.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
Abstract
Description
- This invention relates to a method for operating an apparatus for hydroforming a blank.
- Hydroforming is becoming increasingly important in the automotive industry in order to allow the production of body components. First of all, undeformed blanks, for example tubes, are inserted into the receiving space of a die. The geometry of a receiving space corresponds to the desired external geometry of the finished component. The blank is acted on by high-pressure fluid so that the walls of the blank are plastically deformed and come to bear against the walls of the receiving space. It is in this way possible to economically produce high-strength, complex components.
- To assist the deformation process and to minimize friction which occurs between the wall of the receiving space and the outer skin of the blank, it is known from European document EP 0 771 598 A1 to supply the receiving space with lubricant. The lubricant has the effect of allowing the outer skin of the blank to slide along the wall of the receiving space. It is in this way possible to avoid undesirable distortion.
- German document DE 199 44 722 A1 discloses a method for operating a hydroforming die, in which during the deformation of a hollow body which is present in the die, lubricant is delivered into the forming zone of the die via feedlines running inside the forming die and is if appropriate removed again.
- German document DE 102 02 201 A1 discloses a method in which, likewise during the deformation of a hollow body which is present in the forming die, lubricant is delivered into the forming zone of the die via feedlines running inside the forming die and is if appropriate removed again. In this method, however, the feedlines for supplying the lubricant and those used to discharge it are different.
-
British document GB 21 26 510 A discloses a production process and an apparatus in which, during the deformation of a hollow profiled section in a hydroforming die, excess pressurized fluid is removed via passages running inside the forming die. To facilitate the deformation, the hollow profiled section is lubricated with pressurized fluid on the outer side. - According to German document DE 102 02 201 A1, the principle which is known from European publication EP 0 771 598 A1 is further developed in such a way that a flow of lubricant is generated in the receiving space of the die, so that the deformation process can be assisted even more effectively.
- One problem with the hydroforming apparatuses which are known from the prior art is that, following the actual deformation operation, residual fluid collects in the receiving space. This residual fluid may contain high-pressure fluid, lubricants and/or inclusions of air. After the blank has been removed from the die, the residual fluid remains in the receiving space and may have an adverse effect on a subsequent deformation process. On the one hand, the residual fluid enclosed in the receiving space is substantially not compressible, with the ensuing risk that a blank that is to be deformed cannot adopt the geometry predetermined by the wall of the receiving space during the deformation process and remains undeformed in a region in which residual fluid is present in the receiving space. A second problem is that a reliable supply of lubricant is not ensured in those regions of the receiving space in which the residual fluid has collected.
- Working on this basis, the object of the present invention is to improve a method of the type referred to above in such a manner that a reproducibly good process quality is ensured.
- According to the invention, this object is achieved by the features claimed.
- According to the invention, prior to the deformation of a blank, residual fluid which is present in the receiving space of die is removed from the receiving space through a passage. Lubricant is then fed to the receiving space, and the interior of the blank is supplied with high-pressure fluid. This removal of residual fluid can be assisted by the application of subatmospheric pressure or superatmospheric pressure to the passage.
- Alternatively, prior to the deformation of a blank, residual fluid which is present in the receiving space is removed from the receiving space through the passage by lubricant being fed to the receiving space to displace the residual fluid. High-pressure fluid is thereafter supplied to the interior of the blank.
- In the abovementioned methods, it may be advantageous to use a low-viscosity lubricant, since, compared to high-viscosity lubricants, a low-viscosity lubricant is easier to remove from the receiving space of a die.
- As has already been explained above, the residual fluid substantially comprises high-pressure fluid but may also include dirt particles, lubricant residues and/or inclusions of air. The at least one passage ensures that the receiving space can be drained or vented before a deformation process begins, so that a subsequent deformation process is not affected or disrupted by the presence of residual fluid in the receiving space.
- To assist with the removal of the residual fluid, it is possible for there to be suction means which can be used to apply a subatmospheric pressure to the passage. By way of example, it is possible to provide a suction pump which is connected to the at least one passage, so that high-pressure fluid, lubricant residues and/or air can be sucked out of the receiving space.
- In addition or as an option, it is also possible for there to be a pressure supply. This pressure supply can be used to apply superatmospheric pressure to the passage. Therefore, a superatmospheric pressure can be built up in the region where the passage opens out in the receiving space, with the result that residual fluid which is present in the receiving space is forced out of the receiving space through the passage.
- The die may have lines which open out in the receiving space for supplying and/or removing lubricant. These lines may each be suitable for one direction of transport or may be suitable for both directions of transport, i.e. for both supplying and removing lubricant.
- It is particularly advantageous if the passage through which residual fluid located in the receiving space can be removed from the receiving space is also suitable for supplying and/or removing lubricant. This allows the die to be of particularly simple configuration, since only at least one passage need be present compared to the use of separate passages and lines.
- Further advantageous configurations and details of the invention are to be found in the following description, in which the invention is explained and described in more detail on the basis of the exemplary embodiments illustrated in the drawings.
-
FIG. 1 shows a sectional side view of a first hydroforming apparatus during the removal of residual fluid by suction; -
FIG. 2 shows the apparatus ofFIG. 1 during the supply of lubricant; and -
FIG. 3 shows a sectional side view of a second hydroforming apparatus during the removal of residual fluid by displacement with lubricant. - The apparatus, which is denoted overall by
reference numeral 2 inFIG. 1 , has an upper die half 4 and alower die half 6. The diehalves 4 and 6 delimit areceiving space 8, thewall 10 of which corresponds to the external geometry of a shaped part which is to be produced. - An as yet undeformed, tubular blank 12 has been inserted into the
receiving space 8, theouter skin 14 of which blank 12 comes to bear against thewall 10 of thereceiving space 8 during the deformation process. The blank 12 may be laterally sealed with the aid ofaxial cylinders axial cylinder 18 having aline 20 for a high-pressure fluid supply (not shown). High-pressure fluid can be introduced into the cavity of the blank 12 through theline 20, so that the blank 12 can be deformed. - The
lower die half 6 has threepassages receiving space 10. These passages are connected to amanifold 28. Accordingly, the upper die half 4 haspassages receiving space 8 of theapparatus 2 and lead to amanifold 36. Themanifold 36 of the upper die half 4 and themanifold 28 of thelower die half 6 lead to a commonmain passage 38. - The
main passage 38 is connected to suction means (not shown), for example a vacuum pump. By applying a vacuum,residual fluid 40 which is present in thereceiving space 10 can be removed from thereceiving space 8 in accordance with the directions of flow indicated by the arrows in thepassages 22 to 38. Theresidual fluid 40 may comprise high-pressure fluid, residues of lubricants and/or inclusions of air. The removal of theresidual fluid 40 allows thereceiving space 8 to be drained and vented, so that a subsequent deformation process carried out on the blank 12 is not disrupted by the presence of residual fluid in thereceiving space 8. -
FIG. 2 illustrates theapparatus 2 ofFIG. 1 in a subsequent process step. Theaxial cylinders receiving space 8 compared to the position illustrated inFIG. 1 , so that theaxial cylinders line 20. Simultaneously with or prior to high-pressure fluid being supplied to theline 20, thepassages 22 to 38 can be used to feed a lubricant, denoted by 42, to thereceiving space 8. For this purpose, themain passage 38 is coupled to a lubricant supply. Thelubricant 42 passes into thereceiving space 8 in the region where thepassages 22 to 26 and 30 to 34 open out. As a result, during the subsequent deformation process carried out on the blank 12, it is ensured that theouter skin 14 of the blank 12 can bear against thewall 10 of the receivingspace 8 without any friction losses. -
FIG. 3 illustrates anapparatus 2′ which is similar to theapparatus 2 shown inFIGS. 1 and 2 . The reference numerals shown inFIG. 3 are identical where they denote the same components as in theapparatus 2 shown inFIGS. 1 and 2 . Thelower die half 6 of theapparatus 2′ haspassages Residual fluid 40 which is present in the receivingspace 8 of theapparatus 2′ can be removed through the manifold 28′. Theupper die half 6 of theapparatus 2′ haspassages Lubricant 42 can be fed to the receivingspace 8 of theapparatus 2′ through the manifold 36′. Unlike in theapparatus 2 shown inFIGS. 1 and 2 , themanifolds 28′ and 36′ of theapparatus 2′ shown inFIG. 3 are not in communication with one another. - With the embodiment illustrated in
FIG. 3 , it is possible forresidual fluid 40 which is present in the receivingspace 8 of theapparatus 2′ to be removed from the receivingspace 8 bylubricant 42 being supplied through the manifold 36′, which lubricant passes via thepassages 30 to 34 into the receivingspace 8, where it displacesresidual fluid 40 which is present in the receivingspace 8 and can be discharged via thepassages 22 to 26 and ultimately via the manifold 28.′
Claims (7)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10357341A DE10357341B4 (en) | 2003-12-09 | 2003-12-09 | Apparatus and method for hydroforming a blank |
DE10357341.0 | 2003-12-09 | ||
PCT/EP2004/012652 WO2005061145A1 (en) | 2003-12-09 | 2004-11-09 | Device for internal high-pressure deformation of a blank |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070209418A1 true US20070209418A1 (en) | 2007-09-13 |
Family
ID=34672499
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/582,137 Abandoned US20070209418A1 (en) | 2003-12-09 | 2004-11-09 | Method for Internal High-Pressure Deformation of a Blank |
Country Status (4)
Country | Link |
---|---|
US (1) | US20070209418A1 (en) |
CA (1) | CA2548204A1 (en) |
DE (1) | DE10357341B4 (en) |
WO (1) | WO2005061145A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070180677A1 (en) * | 2003-08-13 | 2007-08-09 | Thyssen Krupp Stahl Ag | Internal high-pressure shaping method for shaping conical tubes made of metal |
US20100072678A1 (en) * | 2006-10-12 | 2010-03-25 | Daimler Ag | Method and Apparatus for Producing a Composite Component |
CN103691796A (en) * | 2013-12-31 | 2014-04-02 | 一重集团大连设计研究院有限公司 | Large internal high-pressure forming die |
CN112496138A (en) * | 2020-11-09 | 2021-03-16 | 保隆(安徽)汽车配件有限公司 | Internal high-pressure forming die and forming method of workpiece |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007019511B3 (en) * | 2007-04-25 | 2008-11-13 | Benteler Automobiltechnik Gmbh | Device for hydraulic-interior high pressure transformation of composite metal tube into bottom die and upper die, has forming tool, where medium, between individual tube wall, is escaped during interior high pressure reforming process |
AU2008267713A1 (en) * | 2007-06-22 | 2008-12-31 | Advanced Applied Physics Solutions, Inc. | Higher pressure, modular target system for radioisotope production |
DE102007043316B4 (en) * | 2007-09-12 | 2009-08-20 | Schulze, Bernd, Dr.-Ing. | Method and device for producing a bulge-containing workpiece by means of a pressure medium |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7574889B2 (en) * | 2001-10-11 | 2009-08-18 | Bodo Furchheim | Method for feeding hydroforming presses, and device for carrying out the method |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2126510A (en) * | 1982-08-27 | 1984-03-28 | Vitkovice Zdarske Strojirny A | Tool for manufacture of shaped workpieces |
EP0771598A1 (en) * | 1995-11-09 | 1997-05-07 | Benteler Ag | Process for reducing the friction by hydraulic forming with internal high pressure and device for hydraulic forming |
DE19628688C1 (en) * | 1996-07-17 | 1997-11-20 | Siempelkamp Pressen Sys Gmbh | Press for internal high pressure forming hollow blanks |
DE19944722A1 (en) * | 1999-09-17 | 2001-04-12 | Walter Panknin | Tool for transformation of workable metallic workpieces has at least one shape tool part with surface determining form of transformed material |
DE10202201A1 (en) * | 2002-01-22 | 2003-07-31 | Porsche Ag | Forming process esp. for metal plates, tubes, etc. with supply of fluid esp. oil to forming area to reduce friction and generate hydrostatic effect within work piece area |
-
2003
- 2003-12-09 DE DE10357341A patent/DE10357341B4/en not_active Expired - Fee Related
-
2004
- 2004-11-09 WO PCT/EP2004/012652 patent/WO2005061145A1/en active Application Filing
- 2004-11-09 US US10/582,137 patent/US20070209418A1/en not_active Abandoned
- 2004-11-09 CA CA002548204A patent/CA2548204A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7574889B2 (en) * | 2001-10-11 | 2009-08-18 | Bodo Furchheim | Method for feeding hydroforming presses, and device for carrying out the method |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070180677A1 (en) * | 2003-08-13 | 2007-08-09 | Thyssen Krupp Stahl Ag | Internal high-pressure shaping method for shaping conical tubes made of metal |
US7797806B2 (en) * | 2003-08-13 | 2010-09-21 | Thyssenkrupp Steel Europe Ag | Internal high-pressure shaping method for shaping conical tubes made of metal |
US20100072678A1 (en) * | 2006-10-12 | 2010-03-25 | Daimler Ag | Method and Apparatus for Producing a Composite Component |
US8241552B2 (en) | 2006-10-12 | 2012-08-14 | Daimler Ag | Method and apparatus for producing a composite component |
CN103691796A (en) * | 2013-12-31 | 2014-04-02 | 一重集团大连设计研究院有限公司 | Large internal high-pressure forming die |
CN112496138A (en) * | 2020-11-09 | 2021-03-16 | 保隆(安徽)汽车配件有限公司 | Internal high-pressure forming die and forming method of workpiece |
Also Published As
Publication number | Publication date |
---|---|
WO2005061145A1 (en) | 2005-07-07 |
DE10357341A1 (en) | 2005-07-14 |
DE10357341B4 (en) | 2006-02-09 |
CA2548204A1 (en) | 2005-07-07 |
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Owner name: DAIMLER AG, GERMANY Free format text: 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;ASSIGNOR:DAIMLERCHRYSLER AG;REEL/FRAME:053583/0493 Effective date: 20071019 |