EP1283754A1 - Verfahren und vorrichtung zur hochdruckumformung - Google Patents
Verfahren und vorrichtung zur hochdruckumformungInfo
- Publication number
- EP1283754A1 EP1283754A1 EP01949337A EP01949337A EP1283754A1 EP 1283754 A1 EP1283754 A1 EP 1283754A1 EP 01949337 A EP01949337 A EP 01949337A EP 01949337 A EP01949337 A EP 01949337A EP 1283754 A1 EP1283754 A1 EP 1283754A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hollow body
- punch
- stamp
- transmission means
- force transmission
- 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
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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/10—Stamping using yieldable or resilient pads
- B21D22/105—Stamping using yieldable or resilient pads of tubular products
Definitions
- the invention relates to a method and a device for high-pressure forming, in which a first punch is moved and a force is exerted on a force transmission means, which transmits the force to a workpiece inserted into an embossing mold and presses it against an embossing contour of the embossing mold.
- the invention relates in particular to a method and a device for expanding cylindrical hollow bodies, in particular elongated hollow profiles, by means of internal high-pressure forming.
- stamps and counterprints are used in sheet metal forming processes. Examples of this are pulling or bending flat sheet metal blanks into blanks.
- Known tools for drawing essentially consist of a stamp and a drawing ring for simple contours, or a stamp and a corresponding counterpressure for more complex contours. In the latter case, both the stamp and the counter pressure have an embossed contour corresponding to the desired shape of the finished part.
- the production cost of such stamps and counterprints is very high and the tools are accordingly expensive.
- the pipe end is expanded with a mandrel.
- the widened end of the tube is compressed in the axial direction in a forming tool, as a result of which it takes on the contour of the forming tool.
- the fluid internal high pressure forming devices which have a supply line for the hydraulic fluid and a plunger for sealing the cavity in the interior of the hollow body.
- the stamp is also used to push wall material of the hollow body in the direction of the point of widening by applying force axially with respect to the cylinder axis in order to avoid a tapering of the wall cross section. Since the hydraulic fluid is introduced under very high pressure and has a high viscosity, the effort required for sealing is very great, especially when forming workpieces made of stainless steel or copper due to the high pressures required up to 10,000 bar. This and the high-pressure fluid production system required for this process make a corresponding tool very expensive.
- Another problem with internal hydroforming is that the wall cross section of the hollow body decreases at the point of expansion and thus forms a weakening of the material.
- the object of the invention is therefore to provide a simple method and a simple device of the type mentioned at the outset, which is inexpensive and at the same time enables process-reliable shaping, in particular of workpieces made of metal and of cylindrical hollow bodies.
- the force transmission means consists of at least one elastically deformable plastic element with resilience.
- the elastically deformable first plastic element transmits this force to the workpiece and presses it against the contour of an embossing mold when a force is directly or indirectly applied by a cylindrical stamp, for example, with a flat stamp surface.
- the plastic deforms elastically until the workpiece - itself plastically deformed - follows the contour against the embossing mold and all the cavities previously in between are filled.
- the method / device according to the invention has the advantage over a hydraulic high-pressure forming tool that the force transmission means is a plastic, that is to say a solid, which, in spite of being deformable, does not require any special measures for sealing the tool. In contrast, the costs for the tool are kept low.
- the method / the device proves to be advantageous in that the elastically deformable plastic element consists of poly-urethane or Vulkollan®.
- the first punch is preferably moved in such a way that the volume available to the force transmission means which is at least partially introduced into the hollow body is reduced, as a result of which the force transmission means essentially changes extends radially with respect to the cylinder axis of the hollow body and widens the hollow body in the direction of a die surrounding it.
- a pressure is applied in the axial direction to a front end of the hollow body by means of a second stamp in order to track wall material of the hollow body during expansion.
- both stamps can be moved hydraulically and the stamp pressures can be controlled individually, or if the second stamp is formed by means of a rotating sleeve which is coaxial with the workpiece and the force transmission means and which is frictionally carried along by the force transmission means and which transmits a vertical force component to the front end of the hollow body.
- Figure 1 is a perspective view of an embodiment of the device.
- Figure 2 is a full section of the same embodiment with an inserted blank before forming.
- FIG. 4 shows a full section of a second exemplary embodiment of the device with an inserted blank before the forming
- FIG. 5 shows a full section of a third exemplary embodiment of the device without a stamp guide
- FIG. 6 shows a full section of a fourth exemplary embodiment of the device
- FIG. 7 shows two assembled half-sections of a fifth example of the device for carrying out the method according to the patent, in each case before and after the end of the shaping, with one-sided stamp facial expressions;
- the device for hydroforming according to the embodiment according to FIG. 1 consists of a radially symmetrical embossing mold 10 which is composed of two half-shells 12, 13 which have a common contact surface 14 oriented in the axial direction.
- the two half-shells enclose a cavity and form the embossed contour, not shown, with their inner surface.
- a first stamp 26 projects into the embossing mold 10 through a bore 24 in the stamp guide 18.
- the punch is essentially a cylinder which has a central coaxial bore 28.
- the bore serves to receive a plunger 30 which extends to the upper edge of the punch guide 18 and cannot be seen in this illustration and has a corresponding diameter.
- the embossing mold can also be composed of a plurality of further shell parts.
- Fig. 2 shows the internal details of the same embodiment.
- the section runs perpendicular to the contact surface 14 between the assembled half-shells 12, 13. All the other elements of the device shown are rotationally symmetrical about the axis 15.
- FIG. 2 also shows a cylindrical hollow body inserted into the embossing mold and projecting downward from the embossing mold in the form of a tubular blank 36.
- the blank 36 is radially surrounded by the contour 40 of the embossing mold 10 and, together with it, encloses a cavity 42.
- a first deformable plastic element 34 is preformed in a cylindrical shape and has a cross section corresponding to the inner diameter of the blank 36. It projects with its lower axial section into the cavity inside the blank 36 and fills it in the axial direction in the area of the embossing contour surrounding it.
- the stamp guide 18 Above in hole 24 the stamp guide 18 is a second elastically deformable plastic element 32 which is beveled in the shape of a truncated cone at its lower end. It rests with its lower end face on a first deformable plastic element 34.
- a plunger 30 which can be suspended from a suspension device (not shown) at its upper end and can thus be fixed in the axial direction.
- the plunger 30 has an integrally formed, thickened centering piece 31.
- the centering piece 31 is embedded in an axial section 44 of the blank 36 which is not to be deformed, in order to center the blank 36 before and during the deformation and to fix it in its radial position.
- the upper end face of the centering piece 31 forms an annular contact surface 33 for the first elastically deformable plastic element 34.
- Both the first and the second deformable plastic element 34, 32 and the punch 26 have a central, coaxial bore which serves to receive the plunger 30 ,
- the plunger 30 thereby also takes over the guiding of the plunger and of both plastic elements 32, 34 when the first plunger 26 is lowered during the shaping process in addition to the centering of the blank 36 or workpiece.
- a ring 46 which is axially movable coaxially with the punch guide and is guided radially on its circumference by a guide bush 48.
- the guide bush 48 is inserted into a corresponding fit of the half-shells 12 and 13 and is flush with its upper end face with the half-shells, so that no gap is formed between it and the stamp guide 18 in the assembled state.
- the ring 46 and the guide bushing 48 form a funnel which tapers from top to bottom and which at its upper end has the radius of the bore 24 of the punch guide 18 and at its lower end the inner radius of the blank 36 has.
- the second deformable plastic element 32 projects so far into the funnel that it has a common contact surface with the ring 46.
- the workpiece is formed by lowering the first punch 26 using a press.
- pressure is exerted on the second plastic element 32, which transmits the pressure vertically downward and at the same time deforms, so that its circumference increases until it fills the cavity between its outside and the bore inner wall of the stamp guide 18.
- the pressure can then only be diverted further downward in the direction of the first plastic element 34.
- the first plastic element lies on the support surface 33 of the plug 30 which is suspended in the press by its suspension device and thus fixed in the axial direction.
- the first plastic element 34 is transferred by the second plastic element.
- a pressure is initially also compressed in the axial direction and at the same time expands in the radial direction. With increasing pressure, it deforms the workpiece outwards in the radial direction.
- An increase in the circumference of the workpiece also causes a shortening in the axial direction.
- the axial pressure that the second plastic element 32 exerts partly frictionally and partly positively on the axially movable ring 46 is transmitted to the upper end 37 of the workpiece, so that the workpiece is pressed in the direction of the lower opening of the embossing die 10 during the forming and tracking wall material of the workpiece.
- a not shown, located outside the embossing mold 10 and with respect to this stationary support for the workpiece 36 prevents the workpiece from moving downward.
- the ring 46 thus forms the hold-down device for the workpiece and thus a second stamp.
- the ring 46 fulfills a sealing Function: Due to the precisely fitting guidance of the ring 46 in the guide bush 48 and the level support of the ring on the workpiece, the cavity 42 between the blank 36 and the contour 40 of the embossing die 10 is sealed against penetration of the plastic during the deformation under high pressure , The inner diameter of the ring 46, which is less than or equal to the inner diameter of the blank, and its outer diameter, which is greater than or equal to the cross section of the embossing contour 40, ensures that the ring 46 rests on the workpiece at every stage of deformation.
- the pressure required for pressing the workpiece 36 or for tracking wall material can be freely selected by a correspondingly selected size of the contact surface of the second plastic element 32 on the movable ring 46. If a larger contact pressure is required, the outer diameter of the ring 46 and of the second plastic element 32 need only be chosen to be correspondingly larger while the punch force remains the same.
- the ring 46 is also gripped in the area of the outer diameter of its end face resting on the workpiece, so that a radially inward flaring of the workpiece is avoided.
- FIG. 3 shows the final state of the forming process in which both elastic plastic elements 32 ', 34' - still under pressure - have expanded in the radial direction and have contracted in the axial direction.
- the workpiece is deformed into the finished part 36 'and follows the contour of the embossing mold.
- the cavity 42 in FIG. 1 between the blank 36 and the embossed contour 40 is now completely filled by the finished part 36 'or the correspondingly deformed plastic element 34'.
- the cavity that radially surrounded the second plastic element 32 before the forming inside the punch guide is filled by the second plastic element 32 '.
- the ring 46 is due to the vertically downward pressure in the axial direction so far down pushed, as the length contraction of the workpiece requires due to its radial expansion.
- the plastic elements 32 ', 34' relax and return to their initial state 32, 34 due to their elastic properties.
- the plastic elements can now, for example, be removed using the ram 30 on which they rest the finished part 36 'or the embossing die 10 are lifted out.
- the two half-shells 12, 13 of the embossing mold must be opened.
- the embossing mold 10 ' consists only of the two half-shells 12', 13 'which, as in the first exemplary embodiment, have a common interface 14'.
- the guidance of the first plunger 26 ' is carried out by a cylindrically symmetrical moving bushing or sleeve 50 arranged along the axis 15' with a central bore 51 and, analogously to the first exemplary embodiment, by a plunger 30 '.
- the rotating sleeve 50 is in turn guided in a central fit 54 in the assembled embossing die 10 '. At its lower end, it has a tapered, cylindrical projection 52 with which it rests on the workpiece 56 to be deformed.
- the projection 52 has the exact same outer cross-section as the contour 40 ′ of the embossing mold in the corresponding upper section and also an inner diameter that corresponds approximately to the inner diameter of the undeformed workpiece 56.
- the workpiece 56 in turn protrudes from the bottom of the embossing mold 10 'and is seated with its lower end on a support (not shown) which is located outside the embossing mold 10' and is fixed relative to this.
- the workpiece is still in its undeformed state with its upper end face flush with the bottom 55 of the central fit 54.
- the plunger 30 ' can be suspended at its upper end by means of a suspension device (not shown) and thus fixed in the axial direction.
- the blank With increasing compression of the plastic element 58, the blank is deformed in the radial direction until it lies against the contour 40 'of the embossing die 12'.
- the traveling sleeve 50 acts as a second punch and hold-down of the workpiece 56 in order to track the wall material of the blank 56 during expansion.
- the fundamental difference from the previous exemplary embodiment is that the rotating sleeve 50 simultaneously replaces the stamp guide 18 and the ring 46 from FIGS. 2 and 3.
- the moving sleeve thus also seals the cavity between the still undeformed blank and the contour of the embossing die against the penetration of the plastic during the deformation and at the same time takes over the guiding of the stamp.
- FIG. 5 represents a simplified "variant of a device for hydroforming. This consists of two half-shells 62 and 63, which are assembled along the interface 64 to form an embossing die 60.
- the assembled embossing die is again rotationally symmetrical and has one on its underside by a support surface 66 closed receptacle with a radial embossing contour 68 and a cylindrical portion 69.
- the workpiece 70 which rests with its lower end face on the support surface 66, projects beyond the upper edge of the embossing mold 60 elastically deformable plastic element 72 is completely embedded in the workpiece 70 and also sits on the Contact surface 66.
- the part of the workpiece 70 protruding beyond the embossing mold 60 also serves as a guide for the stamp 74.
- the functional principle also differs from that of the other exemplary embodiments essentially in that when the plunger 74 is lowered, the radial expansion of the elastic plastic element 72 brings about a frictional entrainment of the workpiece in the direction of the bearing surface 66.
- An additional hold-down device can be dispensed with here due to the length of the contact surface between plastic element 72 and workpiece 70.
- the tool shown in FIG. 5 differs in that a plunger has also been dispensed with and, as a result, the plastic element 72 and the plunger 74 have no central bore. The ram is not necessary in this embodiment because the workpiece is sufficiently centered in the upper cylindrical portion 69 of the receptacle.
- the workpiece 70 After forming in the arrangement shown, the workpiece 70 has an extended sleeve shape at each of its ends. This result is achieved with the tool 60 shown in FIG. 5 by reshaping in two work steps with the workpiece being turned over in the meantime. It is also possible to create a tool that enables the corresponding ends to be shaped in one work step.
- the embossing mold only has to have two corresponding radial contours at the desired distance at the opposite ends of the embossing contour.
- FIG. 6 shows a device with an embossing die 80 composed of two half-shells 82, 83 and having a central bore that is open at the top and bottom.
- the contact surface of the two half-shells runs perpendicular to the image plane through the central axis 85 and cannot be seen in the section shown.
- the embossing contour of the embossing mold 80 in the region of the central bore is not cylindrically symmetrical about the central axis 85, but has a bulge 86 on one side.
- the tool is for molding a tube-like side extension neck provided on a tubular workpiece 88. The workpiece can then be processed into a T-piece in further operations.
- the tool also has two punches 90, 96, of which the first punch 90 has a first cylindrical section 91 with the diameter of the central bore in the embossing die 80 and a second cylindrical section 92 with a diameter equal to the inside diameter of the workpiece.
- the annular transition surface 93 between the two sections of the first punch 91 serves as a support for the workpiece 88, the second section 92 as a centering piece.
- the first stamp with its outer end face 94 is flush with the underside 87 of the embossing die 80.
- the position of the workpiece is hereby defined with respect to the position of the bulge 86.
- the second punch 96 has an outer diameter over its entire length which corresponds to the inner diameter of the workpiece.
- the contact surface for the workpiece 88 formed by the annular transition surface 93 can in principle also be formed by a corresponding gradation of the embossing die 80, by tapering the central bore downward, so that it has the inside diameter in the region of the first stamp 90 of the workpiece 88.
- the first punch must then, like the second punch 96, have an outer diameter corresponding to the inner diameter of the workpiece 88 over its entire length. If the first punch is also lengthened in the axial direction, so that it protrudes downward from the embossing mold 80, there is the advantage that both punches are used for the axial compression of the plastic element Contribute, whereby the radial pressure distribution on the workpiece 88 is uniform over the entire axial range.
- the device according to FIG. 7 consists of a radially symmetrical embossing mold or die 110 which is composed of two half-shells 112, 113 which have a common contact surface 114 oriented in the axial direction and perpendicular to the cutting plane. Both half-shells enclose a cavity 116, which is arranged rotationally symmetrically about an axis 18 and has an embossed contour 120 on the inside with a bead 121 on one side.
- the cavity 116 is closed at its front lower end by a base surface 122 formed by two sharks 112, 113.
- the cavity 116 does not necessarily have to be rotationally symmetrical, but can also have, for example, an embossed contour with one or more branches on one or more sides, into which the bulges of a hollow body extend during the forming. Such branches can also be provided with a counter-stamp in order to make the forming process more controllable.
- FIG. 7 also shows a hollow body 124 inserted into the two half-shells 112, 113 of the die 110, which is centered in a lower cylindrical section 126 of the embossing contour 120.
- the hollow body 124 is a piece of pipe cut to length.
- An intrinsically stable, deformable force transmission means 128 is introduced into the interior of the hollow body 124.
- the force transmission means can be, for example, an elastic plastic element with resilience, a kneadable, pasty paste or also be a plastically deformable wax-containing stopper as a physical component or contain another plastically deformable carrier substance.
- the power transmission means 128 rests with its front lower end on the base surface 122, it almost completely fills the cavity in the interior of the hollow body 124 and projects beyond the hollow body in the axial direction, so that it extends over the frontal upper end 130 of the hollow body before the hollow body is widened Hollow body 124 protrudes.
- a second punch 132 is located on the top of the upwardly open side of the die 110.
- the second punch 132 has a pressure plate 133 and a pressure sleeve 134 embedded therein.
- the lower end of the pressure sleeve 134 rests on the upper end 130 of the hollow body 124.
- a first punch 138 is aligned and guided coaxially to the central axis 118 of the die 110 in a bore penetrating the second punch 132 centrally.
- the first punch projects so far into the die that it rests with its lower end 140 on the force transmission means 128.
- the contact surface between the first punch 138 and the force transmission means can, depending on the volume required for the force transmission means, also outside the die, for example in the area of the punch guide, i.e. lie in the hole.
- the pressure plate 133 or the second punch 132 can even be extended upwards with a cylindrical attachment for the purpose of increasing the volume.
- the device according to FIG. 7 also has two dowel pins 142, 143, which serve to guide the second punch 132 and relieve the pressure sleeve 134 with regard to any attacking shear or buckling forces during the downward movement of the second punch 132.
- the guide bushing 134 fulfills various tasks in the exemplary embodiment shown. On the one hand, it is in the initial state before the hollow body 124 is formed with its tapered lower section 36 in the upper section. cut the embossed contour 120 and thus forms an additional centering and axial guidance for the movement of the second stamp by means of the outer circumference. Furthermore, the axial force for guiding wall material during the expansion of the hollow body 124 is introduced, on the one hand, and the cavity between the outer circumference of the hollow body 114 and the embossing contour 120 by positive engagement, on the one hand, via the end face contact surface between the guide bush 134 and the upper end face end 130 of the hollow body 124 the two face-side contact surfaces 130 are sealed off from the cavity in the interior of the hollow body.
- both punches 132, 138 are shown in a predetermined end position after the shaping process has ended.
- the end position of the first punch 132 is predetermined by the contact of the pressure plate 133 on the die 110.
- the pressure sleeve 134 projects as far into the interior of the die 10 as the change in length of the hollow body 124 caused by the widening ideally requires, while maintaining its original wall thickness.
- the first punch 38 is lowered into the die 110 as far as the volume of the fully expanded hollow body 124 requires, taking into account the compressibility of the force transmission means 128.
- a pipe piece 124 cut to length is first inserted into the two half-shells 112, 113.
- a prefabricated elastically deformable plastic stopper with resilience or a plastically deformable wax stopper 128 is inserted into the pipe section 124.
- the wax plug can also contain other active media such as sand.
- the second punch 132 is then moved in the direction of the die 110 until the pressure sleeve 134 is open meets the front upper end 130 of the pipe section 124 and acts on it with slight but sufficient pressure to seal the cavity in the interior of the pipe section 124.
- the first punch 138 is then moved until it hits the inserted plastic / wax plug.
- Both punches 132, 138 are then moved hydraulically in such a way that the pressure acting on the front-side upper end 130 of the tube piece 124 during expansion is equal to the pressure which acts on the plastic / wax plug from the first punch 138.
- the pressing process is carried out in this form until a defined maximum pressure is reached, which is determined by the fact that the outer circumference of the tube piece 124 lies completely against the embossing contour 120 of the die 110.
- an increased pressure can again be applied to the force transmission means 128 by means of the first punch 138 in order to ensure the desired shape of the pipe section 124.
- Both stamps can be moved by means of an automatic control.
- the first and second punches 138, 132 move back hydraulically, and at the same time the two half-shells 112, 113 of the die 110 are opened.
- the finished pressed pipe section 124 can then be removed from one of the half shells 112, 113 and the plastic / wax filling can be removed from the pipe section 124.
- the second embodiment of a tool for carrying out the patented method according to FIG. 8 has a die 110 ', which in turn is composed of two half-shells 112', 113 'and annularly surrounds a central, continuous cavity 116'.
- the cavity 116 ' is arranged rotationally symmetrically about an axis 118' and has an embossed contour 120 'on the inside around it with two beads 121', 121 ".
- This die is suitable for simultaneously closing the two ends of an inserted hollow body 124 'in one operation wide.
- a first punch 138 ', 138 "and coaxially a second punch 132', 132" consisting of a pressure plate 133 ', 133 "and a pressure sleeve 134', 134" are provided on both axial ends of the die.
- An intrinsically stable, deformable force transmission element 128 ' is inserted into the hollow body 124', which axially projects over the hollow body 124 'in the initial state before the deformation on both front ends 130', 131 '.
- the die 110 ' Due to the continuous cavity, the die 110 'now has no base area.
- the two second punches 132 ', 132 "are therefore hydraulically controlled axially at the beginning of the forming process until the hollow body 124' has assumed a position defined relative to the die 110 'and its inner cavity at both ends 130', 131 'by means of the Pressure sleeves is sealed.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Description
Claims
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE20008635U | 2000-05-13 | ||
| DE20008635U DE20008635U1 (de) | 2000-05-13 | 2000-05-13 | Werkzeug zur Hochdruckumformung |
| DE2000158521 DE10058521A1 (de) | 2000-11-24 | 2000-11-24 | Verfahren und Vorrichtung zum Weiten von zylindrischen Hohlkörpern |
| DE10058521 | 2000-11-24 | ||
| PCT/EP2001/005393 WO2001087510A1 (de) | 2000-05-13 | 2001-05-11 | Verfahren und vorrichtung zur hochdruckumformung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1283754A1 true EP1283754A1 (de) | 2003-02-19 |
| EP1283754B1 EP1283754B1 (de) | 2004-01-14 |
Family
ID=26007782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01949337A Expired - Lifetime EP1283754B1 (de) | 2000-05-13 | 2001-05-11 | Verfahren und vorrichtung zur hochdruckumformung |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1283754B1 (de) |
| AT (1) | ATE257752T1 (de) |
| AU (1) | AU2001270520A1 (de) |
| DE (1) | DE50101333D1 (de) |
| ES (1) | ES2211816T3 (de) |
| WO (1) | WO2001087510A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006047017A1 (de) | 2006-10-02 | 2008-04-03 | Fachhochschule Köln Fakultät für Angewandte Sozialwissenschaften | Vorrichtung zur Innenhochdruckumformung |
| DE102008060023A1 (de) * | 2008-12-02 | 2010-06-10 | Heinrich Gillet Gmbh | Verfahren zum Herstellen von Schalldämpfern für Kraftfahrzeuge |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB669163A (en) * | 1948-12-08 | 1952-03-26 | Rex Robert Seeber | Improvements in method and apparatus for reshaping metal tubes |
| FR1154610A (fr) * | 1955-07-21 | 1958-04-14 | Michigan College Of Mining & T | Procédé et appareil pour changer la forme des tubes métalliques |
| JPH0394927A (ja) * | 1989-09-07 | 1991-04-19 | Fuji Injiekuta Kk | 筒体に膨出成形を施す方法 |
| JPH09225545A (ja) * | 1996-02-16 | 1997-09-02 | Tokico Ltd | 管体成形方法 |
-
2001
- 2001-05-11 AT AT01949337T patent/ATE257752T1/de not_active IP Right Cessation
- 2001-05-11 ES ES01949337T patent/ES2211816T3/es not_active Expired - Lifetime
- 2001-05-11 AU AU2001270520A patent/AU2001270520A1/en not_active Abandoned
- 2001-05-11 WO PCT/EP2001/005393 patent/WO2001087510A1/de not_active Ceased
- 2001-05-11 EP EP01949337A patent/EP1283754B1/de not_active Expired - Lifetime
- 2001-05-11 DE DE50101333T patent/DE50101333D1/de not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0187510A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2001270520A1 (en) | 2001-11-26 |
| ES2211816T3 (es) | 2004-07-16 |
| ATE257752T1 (de) | 2004-01-15 |
| WO2001087510A1 (de) | 2001-11-22 |
| DE50101333D1 (de) | 2004-02-19 |
| EP1283754B1 (de) | 2004-01-14 |
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