EP2272601A1 - Hydroforming method - Google Patents
Hydroforming method Download PDFInfo
- Publication number
- EP2272601A1 EP2272601A1 EP10004775A EP10004775A EP2272601A1 EP 2272601 A1 EP2272601 A1 EP 2272601A1 EP 10004775 A EP10004775 A EP 10004775A EP 10004775 A EP10004775 A EP 10004775A EP 2272601 A1 EP2272601 A1 EP 2272601A1
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- EP
- European Patent Office
- Prior art keywords
- hollow profile
- fluid
- hydroforming
- hydraulic fluid
- mold cavity
- 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.)
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Classifications
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- 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
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- 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
- B21D26/041—Means for controlling fluid parameters, e.g. pressure or temperature
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- 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
- B21D26/043—Means for controlling the axial pusher
Definitions
- the invention relates to a method for hydraulic hydroforming of hollow sections of a metallic material.
- the forming times are on the order of about 1.5 to 3 seconds. In comparison with the so-called high-speed hydroforming process (HSH), these production times are very long.
- the hydroforming times in HSH processes are usually well below 0.5 seconds.
- the high-speed hydroforming also results in very large differences in the cycle times. While in the conventional hydroforming process cycle times of the order of e.g. 25 seconds, the HSH method results in cycle times between 6 and 8 seconds.
- the invention is therefore based on the object to provide a method for hydraulic hydroforming of hollow sections of a metallic material, with which it is possible to avoid process-related material accumulations on the tool surface.
- a hollow profile to be reshaped is immersed in a dip tank filled with a hydraulic fluid.
- the filling of the hollow profile is thus not only in the hydroforming station, but before. In this way, the cavity of the hollow profile can be completely flooded before forming.
- the transport into the actual hydroforming station thus takes place in the hydraulic fluid.
- the hydroforming station used is a press with an upper die and a lower die with a corresponding mold cavity into which the hollow profile filled with hydraulic fluid is inserted. After shutting down the upper die or closing the mold cavity, the ends of the hollow profile are closed by sealing mandrels. At the same time the internal pressure is applied with the goal of hydroforming.
- an existing fluid cushion is maintained controlled with decreasing amount of fluid over a period of time to good lubrication during the Nachschiebens of the hollow section to provide over the sealing mandrels. It should therefore be used hydraulic fluid to form a fluid cushion, which must not be degraded too quickly.
- this end contour at least in those areas that are to be nachgeschoben on the sealing mandrel, not at the beginning of Nachschiebens to achieve by particularly high internal pressures, but only at a late date, namely, only when the tracking of a sealing mandrel is completed.
- the fluid cushion is no longer needed.
- the fluid cushion should be maintained as long as the deformation takes place in particular in the areas pushed in by the sealing mandrel.
- the thickness of the fluid cushion should decrease continuously.
- the frictional forces between the workpiece and the mold cavity can be substantially reduced. As a result, this has a positive effect on the force to be transmitted via the sealing mandrel. Material accumulations are avoided. The service life of the tools is increased and the profitability improved.
- the process according to the invention shows its advantages especially in relation to steel softer materials, such. Aluminum.
- the method is also for other metallic materials, such. As steel or magnesium, suitable.
- the press used is preferably a transfer press with automatic transport systems.
- the press can be both a be hydraulically and mechanically driven press. It is also possible to use servo-motor driven presses.
- a so-called transfer bar transports the hollow profiles from processing station to processing station. This is preferably done within the scope of the invention entirely within a hydraulic fluid bath, i. in a sense, below a liquid level.
- Another processing station can be, for example, a preforming station, in which the hollow profile receives a cross-section, which is provided to form a fluid cushion between the hollow profile and the mold cavity.
- the hollow profile at least in those areas that are essentially only nachgeschoben, selectively receive a wavy cross section, so there are as few points of contact between the hollow section and the mold cavity.
- the aim is to create a defined fluid cushion. Therefore, the cross-sectional contour of the preform can differ significantly from the desired by hydroforming contour.
- the preforming of the hollow profile thus does not have the aim of creating a contour which is as close as possible to the final product, but is intended to have specific deviations therefrom.
- the prepared for hydroforming hollow sections are bent or even deformed so that the ends are not completely flat against the Abdichtdornen. This inevitably results in leaks. Either the leaks would have to be eliminated by a separate manufacturing step by upsetting or cutting the preformed components. In the invention, however, such a high pressure increase is realized at a corresponding flow rate that leaks can be neglected and consider the ends of the hollow profile as sealed. Therefore, a hollow profile end must not rest on the sealing mandrel over its entire surface. Due to the high excess of hydraulic fluid, the relatively small amounts of hydraulic fluid that escape through leaks, negligible. The high-speed hydroforming can be done easily.
- a larger volume of liquid should be specifically pumped into the hollow profile, as can be added in addition to the present in the hollow profile hydraulic fluid in the hollow profile. This refers to the final contour at the end of the hydroforming process, ie the finished product.
- a blunt seal is understood to mean a sealing mandrel having an end face perpendicular to the longitudinal direction without projections or depressions which are particularly adapted to the inner contour of the hollow profile.
- This standing perpendicular to the feed direction end face extends over a much larger area than the mere wall thickness of the reshaped hollow sections, and that because the hollow sections not close to the final contour, but selectively corrugated to form the fluid cushion and in particular at a distance from the walls of the mold cavity.
- the sealing mandrel So that it does not come to clamping in the sealing mandrel, the sealing mandrel has a correspondingly large, flat, ie dull, contact surface. It is dispensed with special sealant to reduce the leakage in the transition region between the sealing mandrel and the hollow profile.
- This type of leak-tight seal has the advantage that the ends of the hollow profile need not be specially prepared to perform the high-speed hydroforming process and that the ends of the finished hydroformed hollow sections need not be cut off. This can save material.
- the upper die displaces less than the twentieth part of the fluid quantity in which the lower die is located when closing the mold cavity.
- the ratio between displaced volume and the bath volume must be chosen sufficiently large.
- very high pressures occur in the method according to the invention, with leakage flows flowing back into the fluid bath. So that the hydraulic fluid does not spray out in an uncontrolled manner, the leakage flow can be damped by a corresponding amount of hydraulic fluid.
- the leakage points should be low enough below the fluid level. Additional shielding measures are appropriate.
- the controlled discharge of the hydraulic fluid from the fluid cushion can be effected by providing a defined gap between the upper die and the lower die which adjoins the mold cavity.
- a gap is set in the parting line between the upper die and the lower die, which just allows enough hydraulic fluid to flow out so that the fluid cushion is completely dismantled at the conclusion of the follow-up operation of the sealing mandrel.
- grooves may be provided in the mold cavity, via which the hydraulic fluid is discharged. This is expediently carried out in the direction of the sealing mandrel, since larger leakage flows can occur here anyway.
- the hydraulic fluid may be tempered, so that the existing of a metallic material hollow profiles are transformed to a certain extent warm by means of a high-speed hydroforming process.
- the warm or hot forming of metal increases the formability.
- the hollow profile heats up faster, so that the subsequent hydroforming operation can also be carried out accelerated.
- the heating in the fluid bath has the advantage that the hollow profiles can be conductively heated with a medium contacting the hollow profile directly. This method is more effective than oven heating due to the high thermal conductivity of liquids.
- FIG. 1 shows a designed as a transfer press 1 with a hydroforming station.
- the press 1 comprises a press table 2, on which there is a dip tank 3, which is filled with a hydraulic fluid.
- the first station is a filling station 4.
- This is followed by a preforming station 5.
- This is followed by a hydroforming station 6 and finally a finishing station 7.
- raw material 8 is transported by means of a robot 9 into the filling station 4.
- the raw material 8, which is hollow sections 10, filled with hydraulic fluid or the hollow section 10 runs full of hydraulic fluid.
- the filled with hydraulic fluid hollow section 10 is transported to the next processing station 5 by means of a schematically indicated transfer bar 11. Transport from workstation to workstation takes place below the fluid level until the hollow section 10, which has been shaped with hydroforming, is finally removed by a further robot 12 at the finishing station 7.
- the finished parts 13 are stored by the robot 12.
- the press 1 has a press ram 14, on which corresponding upper dies for the respective processing stations 5, 6 and 7 are arranged.
- a piston-cylinder unit 16 is arranged, which serves to press hydraulic fluid into the interior of the hollow profile 10 during the hydroforming.
- the press 1 is connected in a manner not shown with a pressure control system and a pressure control, in particular, as shown in the DE 10 2005 057 863 B3 is described.
- the upper die 15 is assigned a lower die 17 in a known manner.
- FIG. 2 shows an enlarged view of a cross section through the closed Hydroformstation 6. It can be seen that between the upper die 15 and the lower die 17 within a substantially rectangular in cross-section configured mold cavity 18 a reshaped hollow section 10 is arranged.
- the hollow profile 10 touches the mold cavity 18 as little as possible, ie only selectively. This is due to the fact that the hollow profile 10 has been reshaped in such a way that a space filled with fluid remains between the mold cavity 18 and the hollow profile 10.
- the mold cavity 18 has grooves 20, which in this embodiment are located centrally in the upper die 15 and in the lower die 17 and, as it were, extend in the longitudinal direction of the die cavity 18.
- grooves 20 are not intended to serve as a contour for the hollow profile in the hydroforming process, but rather to discharge the hydraulic fluid from the fluid cushion 19 when the internal pressure p in the interior of the hollow section 10 increases during hydroforming and the hollow profile 10 expands.
- the gap 21 is so narrow that no material of the hollow profile 10 penetrates into the gap 21 during the hydroforming.
- the cross section of the grooves and columns is adapted in a special way, in such a way that the hydraulic fluid can flow out of the fluid pads 19 only with reduced flow velocity.
- the aim is to maintain the fluid cushion 19 controlled with a continuously decreasing amount of fluid over a period of time, namely at least until the tracking of a sealing mandrel is completed.
- FIG. 2 illustrated cross-section refers to that portion of the hollow section 10, which is only slightly widened by hydroforming, in that it only comes to rest in the mold cavity 18 without being stretched in the sense of a reduction in wall thickness.
- the actual expansion by internal high pressure takes place in other areas, wherein the cross-sectional contour shown only shows that area which is to be pushed into the said, more dilated areas.
- the illustrated cross-section is therefore in particular in a sealing mandrel adjacent areas. There, the corresponding grooves 20 and 21 columns should be provided for the fluid cushion 19.
- FIGS. 3a-c show the course of the hydroforming process. Shown is a longitudinal section through the mold cavity 18 of FIG. 2 , In FIG. 3a it can be seen that the sealing mandrel 22 is retracted into the mold cavity 8. Hydraulic fluid is pumped into the interior of the hollow profile 10 via a channel 23 and a pressure p is built up. In FIG. 3b the sealing mandrel 22 has been moved in the direction of arrow P1 to track the hollow section 10. In a region of the mold cavity 18, not shown, a bulge is provided in which the hollow section 10 through Hydroforming is to be pressed. To avoid Materialwand-3nreduzi für there, material is nachgeschoben end. In these retarded regions of the hollow profile 10, the fluid cushion 19 is maintained.
- the hollow profile 10 in this case has not penetrated into the grooves 20. In the illustrated position, only the Nachschiebevorgang or the tracking of the sealing mandrel 22 is completed. Meanwhile, the widening of regions of the hollow profile 10 which are not shown in detail can still be continued because the internal pressure p is still applied even when the fluid cushion 19 has been broken down.
- FIG. 4 shows a hollow section 10, the end of which is not flat against the sealing mandrel 22.
- the circled area L shows that the end face of the hollow profile 10 in the vicinity of the upper die 15 extends at a distance from the sealing mandrel 22. There leaks occur. Due to the fact that a very large amount of fluid is conveyed via the channel 23 in the sealing mandrel 22, the pressure p can nevertheless be applied to hydroforming.
- the area L is shown exaggeratedly large. In practice, in the region L, not so much hydraulic fluid would escape that the desired forming pressure P could not be achieved. The method according to the invention can therefore also be carried out if there are leakage flows in the region of the sealing mandrel 22.
- the sealing mandrel 22 may have a perpendicular to the feed direction end face without additional sealing means, which in the would be introduced hollow profile 10 to be formed.
- additional sealing means which in the would be introduced hollow profile 10 to be formed.
- the curve K1 represents the pressure curve of a press 1 over time with an electronically or hydraulically controlled pressure system for the hydroforming according to the known prior art.
- the pressure build-up starts at zero and rises above the working point A of the hydroforming process up to the top dead center B1 Curve K1. Subsequently, the pressure drops over the pressure drop point C1 to the point D1 again.
- the curve K2 shows the way, ie the stroke, of a mechanical press.
- the press stroke in which the upper die is formed with an additional piston-cylinder unit 16 for generating pressure
- the press stroke after it has reached its bottom dead center B1, continues in the direction of not shown in the diagram top dead center on the Pressure Drop Points C1 and D1.
- the curve K1 and the pressure drop point C1 the press is still locked.
- the press opens, the pressure is reduced and the press 1 opens the hydroforming tool in point D1.
- the top dead center, not shown, OT is traversed without time delay.
- the curve K2 shows the pressure curve of a press, as shown in the DE 10 2005 057 863 B3 is described.
- the local press a pressure control system and a pressure control of at least one piston-cylinder-spring unit are provided, wherein the press is provided with a further device for additional manufacturing operations. In the time window of the print plateau B1-B2 additional manufacturing operations are performed.
- the curve K3 is a movement curve of the sealing mandrel 22.
- the section RS is normally the critical path of the entire movement curve, because in this area the hydraulic fluid quickly flows out of the fluid cushion, since the hollow section 10 applies in this phase to the mold cavity.
- the sealing mandrel 22 holds its position until it is finally returned again (TD 2 ).
- the curve K4 illustrates the thickness of a fluid cushion. It can be seen that the thickness between the point G and the point H decreases relatively rapidly and in particular goes to zero, before the sealing mandrel has completely passed through the region R-S of the movement curve. This means that the liquid drains off quickly. There is increased friction between the workpiece and the tool and the disadvantages discussed. According to the invention, it is provided that the thickness of the fluid cushion is reduced much more slowly, as shown by the curve K5. It can be seen that the sealing mandrel has already passed through the region R-S, while the fluid cushion has not even been reduced to 50% of its thickness. Only at the point J, which is temporally after the end of the NachInstitutvorgangs the sealing mandrel, the thickness of the fluid cushion goes to zero.
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Abstract
Description
Die Erfindung betrifft ein Verfahren zur hydraulischen Innenhochdruckumformung von Hohlprofilen aus einem metallischen Werkstoff.The invention relates to a method for hydraulic hydroforming of hollow sections of a metallic material.
Es ist Stand der Technik, metallische Bauteile mittels konventionellen Hydroformverfahren herzustellen. Typischerweise liegen die Umformzeiten in einer Größenordnung von ca. 1,5 bis 3 Sekunden. Im Vergleich mit den so genannten Highspeed-Hydroformverfahren (HSH) sind diese Fertigungszeiten sehr lang. Die Hydroformzeiten bei HSH-Verfahren liegen normalerweise weit unter 0,5 Sekunden. Durch das Highspeed-Hydroforming ergeben sich auch sehr große Unterschiede in den Taktzeiten. Während beim konventionellen Hydroformverfahren Taktzeiten in einer Größenordnung von z.B. 25 Sekunden liegen, ergeben sich beim HSH-Verfahren Taktzeiten zwischen 6 und 8 Sekunden.It is state of the art to produce metallic components by means of conventional hydroforming methods. Typically, the forming times are on the order of about 1.5 to 3 seconds. In comparison with the so-called high-speed hydroforming process (HSH), these production times are very long. The hydroforming times in HSH processes are usually well below 0.5 seconds. The high-speed hydroforming also results in very large differences in the cycle times. While in the conventional hydroforming process cycle times of the order of e.g. 25 seconds, the HSH method results in cycle times between 6 and 8 seconds.
Nachteilig bei der Innenhochdruckumformung von weicheren Werkstoffen, wie z.B. Aluminiumwerkstoffen, ist, dass diese zum Schmieren neigen, so dass es zu Aluminiumanhäufungen an den Werkzeugen kommt. Dies erhöht die Instandhaltungskosten der Hydroformwerkzeuge. Trotz theoretisch erhöhter Umformgeschwindigkeit können diese Vorteile durch erhöhte Werkzeugkosten zumindest teilweise zunichte gemacht werden.A disadvantage of the hydroforming of softer materials, such as aluminum materials, is that they tend to smear, so it comes to aluminum accumulations at the tools. This increases the maintenance costs of hydroforming tools. Despite theoretically increased forming speed, these advantages can be at least partially nullified by increased tooling costs.
Der Erfindung liegt daher die Aufgabe zu Grunde, ein Verfahren zur hydraulischen Innenhochdruckumformung von Hohlprofilen aus einem metallischen Werkstoff aufzuzeigen, mit welchem es möglich ist, verfahrensbedingte Werkstoffanhäufungen an der Werkzeugoberfläche zu vermeiden.The invention is therefore based on the object to provide a method for hydraulic hydroforming of hollow sections of a metallic material, with which it is possible to avoid process-related material accumulations on the tool surface.
Diese Aufgabe ist bei einem Verfahren mit den Merkmalen des Patentanspruchs 1 gelöst.This object is achieved in a method having the features of
Vorteilhafte Weiterbildungen des Erfindungsgedankens sind Gegenstand der Unteransprüche.Advantageous developments of the inventive concept are the subject of the dependent claims.
Bei dem erfindungsgemäßen Verfahren wird ein umzuformendes Hohlprofil in ein mit einem Hydraulikfluid gefülltes Tauchbecken eingetaucht. Die Befüllung des Hohlprofils erfolgt also nicht erst in der Hydroformstation, sondern bereits vorher. Auf diese Weise kann der Hohlraum des Hohlprofils schon vor der Umformung vollständig geflutet werden. Der Transport in die eigentliche Hydroformstation erfolgt somit in dem Hydraulikfluid. Als Hydroformstation dient eine Presse mit einem Obergesenk und einem Untergesenk mit einem entsprechenden Formhohlraum, in das das mit Hydraulikfluid gefüllte Hohlprofil eingelegt wird. Nach dem Herunterfahren des Obergesenks bzw. dem Schließen des Formhohlraums werden die Enden des Hohlprofils über Abdichtdorne geschlossen. Gleichzeitig erfolgt die Innendruckbeaufschlagung mit dem Ziel der Innenhochdruckumformung.In the method according to the invention, a hollow profile to be reshaped is immersed in a dip tank filled with a hydraulic fluid. The filling of the hollow profile is thus not only in the hydroforming station, but before. In this way, the cavity of the hollow profile can be completely flooded before forming. The transport into the actual hydroforming station thus takes place in the hydraulic fluid. The hydroforming station used is a press with an upper die and a lower die with a corresponding mold cavity into which the hollow profile filled with hydraulic fluid is inserted. After shutting down the upper die or closing the mold cavity, the ends of the hollow profile are closed by sealing mandrels. At the same time the internal pressure is applied with the goal of hydroforming.
Bei dem erfindungsgemäßen Verfahren kommt hinzu, dass zwischen dem Formhohlraum und dem Hohlprofil ein vorhandenes Fluidpolster bei abnehmender Fluidmenge kontrolliert über einen Zeitraum aufrechterhalten wird, um für eine gute Schmierung während des Nachschiebens des Hohlprofils über die Abdichtdorne zu sorgen. Es soll daher Hydraulikfluid dazu genutzt werden, ein Fluidpolster zu bilden, das keinesfalls zu schnell abgebaut werden darf. Entgegen der ursprünglichen Zielrichtung des Highspeed-Hydroforming, das Bauteil möglichst schnell umzuformen und das Bauteil schnell in seine Endkontur zu bringen, ist bei dem erfindungsgemäßen Verfahren vorgesehen, diese Endkontur zumindest in denjenigen Bereichen, die über den Abdichtdorn nachgeschoben werden sollen, nicht zu Beginn des Nachschiebens durch besonders hohe Innendrücke zu erreichen, sondern erst zu einem möglichst späten Zeitpunkt, nämlich erst dann, wenn das Nachführen eines Abdichtdorns abgeschlossen ist. In diesem Moment wird das Fluidpolster nicht weiter benötigt. Das Fluidpolster soll so lange aufrechterhalten werden, wie die Umformung insbesondere in den durch den Abdichtdorn nachgeschobenen Bereichen stattfindet. Dabei sollte die Dicke des Fluidpolsters kontinuierlich abnehmen.In the method according to the invention is added that between the mold cavity and the hollow profile, an existing fluid cushion is maintained controlled with decreasing amount of fluid over a period of time to good lubrication during the Nachschiebens of the hollow section to provide over the sealing mandrels. It should therefore be used hydraulic fluid to form a fluid cushion, which must not be degraded too quickly. Contrary to the original aim of the high-speed hydroforming to reshape the component as quickly as possible and bring the component quickly to its final contour is provided in the inventive method, this end contour, at least in those areas that are to be nachgeschoben on the sealing mandrel, not at the beginning of Nachschiebens to achieve by particularly high internal pressures, but only at a late date, namely, only when the tracking of a sealing mandrel is completed. At this moment, the fluid cushion is no longer needed. The fluid cushion should be maintained as long as the deformation takes place in particular in the areas pushed in by the sealing mandrel. The thickness of the fluid cushion should decrease continuously.
Optimal wäre es, wenn der Werkstoff während des Nachschiebens keinen direkten Kontakt zum Werkzeug hat. Bei optimierter Auslegung des Verfahrens ergibt sich gegenüber einem Highspeed-Hydroforming ohne ein solches Fluidpolster keine zeitliche Verzögerung, da der Umformvorgang bzw. das Nachschieben des Abdichtdorns nicht langsamer erfolgt als ohne Fluidpolster.It would be optimal if the material has no direct contact with the tool during the feeding. With optimized design of the method results over a high-speed hydroforming without such a fluid cushion no time delay, since the forming process or the Nachschieben the sealing mandrel is not slower than without fluid cushion.
Mit der Erfindung können die Reibungskräfte zwischen dem Werkstück und dem Formhohlraum wesentlich reduziert werden. Im Ergebnis wirkt sich das positiv auf die über den Abdichtdorn zu übertragende Kraft aus. Materialanhäufungen werden vermieden. Die Standzeit der Werkzeuge wird gesteigert und die Wirtschaftlichkeit verbessert.With the invention, the frictional forces between the workpiece and the mold cavity can be substantially reduced. As a result, this has a positive effect on the force to be transmitted via the sealing mandrel. Material accumulations are avoided. The service life of the tools is increased and the profitability improved.
Das erfindungsgemäße Verfahren zeigt seine Vorteile insbesondere bei im Verhältnis zu Stahl weicheren Werkstoffen, wie z.B. Aluminium. Das Verfahren ist jedoch ebenso für andere metallische Werkstoffe, wie z. B. Stahl oder auch Magnesium, geeignet.The process according to the invention shows its advantages especially in relation to steel softer materials, such. Aluminum. However, the method is also for other metallic materials, such. As steel or magnesium, suitable.
Bei der verwendeten Presse handelt es sich bevorzugt um eine Transferpresse mit automatischen Transportsystemen. Die Presse kann sowohl eine hydraulisch als auch mechanisch angetriebene Presse sein. Es ist auch möglich, servo-motorisch angetriebene Pressen einzusetzen.The press used is preferably a transfer press with automatic transport systems. The press can be both a be hydraulically and mechanically driven press. It is also possible to use servo-motor driven presses.
Ein so genannter Transferbalken transportiert die Hohlprofile von Bearbeitungsstation zu Bearbeitungsstation. Dies erfolgt im Rahmen der Erfindung vorzugsweise vollständig innerhalb eines Hydraulikfluidbads, d.h. gewissermaßen unterhalb eines Flüssigkeitspegels.A so-called transfer bar transports the hollow profiles from processing station to processing station. This is preferably done within the scope of the invention entirely within a hydraulic fluid bath, i. in a sense, below a liquid level.
Eine weitere Bearbeitungsstation kann beispielsweise eine Vorformstation sein, in welcher das Hohlprofil einen Querschnitt erhält, welcher zur Ausbildung eines Fluidpolsters zwischen dem Hohlprofil und dem Formhohlraum vorgesehen ist. Beispielsweise kann das Hohlprofil zumindest in denjenigen Bereichen, die im Wesentlichen nur nachgeschoben werden, gezielt einen welligen Querschnitt erhalten, damit es möglichst wenige Berührungspunkte zwischen dem Hohlprofil und dem Formhohlraum gibt. Ziel ist es, ein definiertes Fluidpolster zu schaffen. Daher kann die Querschnittskontur des Vorformlings deutlich von der durch Innenhochdruckumformung angestrebten Kontur abweichen. Die Vorformung des Hohlprofils hat also nicht das Ziel, eine Kontur zu schaffen, die dem fertigen Erzeugnis möglichst endkonturnah ist, sondern soll hiervon gezielt Abweichungen aufweisen.Another processing station can be, for example, a preforming station, in which the hollow profile receives a cross-section, which is provided to form a fluid cushion between the hollow profile and the mold cavity. For example, the hollow profile, at least in those areas that are essentially only nachgeschoben, selectively receive a wavy cross section, so there are as few points of contact between the hollow section and the mold cavity. The aim is to create a defined fluid cushion. Therefore, the cross-sectional contour of the preform can differ significantly from the desired by hydroforming contour. The preforming of the hollow profile thus does not have the aim of creating a contour which is as close as possible to the final product, but is intended to have specific deviations therefrom.
In der Regel werden die zur Innenhochdruckumformung vorbereiteten Hohlprofile gebogen oder auch nur verformt, so dass die Enden nicht vollständig eben an den Abdichtdornen anliegen. Dadurch ergeben sich zwangsläufig Leckagen. Entweder müssten die Leckagen durch einen separaten Fertigungsschritt beseitigt werden, indem die vorgeformten Bauteile gestaucht oder zugeschnitten werden. Bei der Erfindung wird jedoch ein so hoher Druckanstieg bei entsprechendem Förderstrom realisiert, dass Leckagen vernachlässigt werden können und die Enden des Hohlprofils als abgedichtet betrachten gelten. Daher muss ein Hohlprofil endseitig nicht vollflächig an dem Abdichtdorn anliegen. Durch den hohen Überschuss an Hydraulikfluid sind die relativ kleinen Mengen Hydraulikfluid, die durch Undichtigkeiten entweichen, vernachlässigbar. Das Highspeed-Hydroforming kann problemlos durchgeführt werden.In general, the prepared for hydroforming hollow sections are bent or even deformed so that the ends are not completely flat against the Abdichtdornen. This inevitably results in leaks. Either the leaks would have to be eliminated by a separate manufacturing step by upsetting or cutting the preformed components. In the invention, however, such a high pressure increase is realized at a corresponding flow rate that leaks can be neglected and consider the ends of the hollow profile as sealed. Therefore, a hollow profile end must not rest on the sealing mandrel over its entire surface. Due to the high excess of hydraulic fluid, the relatively small amounts of hydraulic fluid that escape through leaks, negligible. The high-speed hydroforming can be done easily.
Während der Innenhochdruckumformung soll daher gezielt ein größeres Flüssigkeitsvolumen in das Hohlprofil gepumpt werden, als zusätzlich zu dem in dem Hohlprofil vorhandenen Hydraulikfluid in dem Hohlprofil aufgenommen werden kann. Dies bezieht sich auf die Endkontur am Ende des Innenhochdruckumformvorgangs, also auf das fertige Erzeugnis.During hydroforming, therefore, a larger volume of liquid should be specifically pumped into the hollow profile, as can be added in addition to the present in the hollow profile hydraulic fluid in the hollow profile. This refers to the final contour at the end of the hydroforming process, ie the finished product.
Dadurch, dass das Hohlprofil anfänglich möglichst vollständig von einem Fluidpolster umgeben sein soll, ist es zweckmäßig, das Ende des Abdichtdorns stumpf zu gestalten. Unter einer stumpfen Abdichtung im Sinne der Erfindung wird ein Abdichtdorn mit einer senkrecht zur Längsrichtung stehenden Stirnfläche ohne besonders an die Innenkontur des Hohlprofils angepasste Vorsprünge oder Vertiefungen verstanden. Diese senkrecht zur Vorschubrichtung stehende Stirnfläche erstreckt sich hierbei über einen wesentlich größeren Bereich als die bloße Wanddicke der umzuformenden Hohlprofile, und zwar weil die Hohlprofile nicht endkonturnah, sondern zur Ausbildung des Fluidpolsters gezielt gewellt und insbesondere im Abstand zu den Wänden des Formhohlraums verlaufen. Manche Umfangsbereiche des Hohlprofils werden daher während der Innenhochdruckumformung wesentlich weiter radial nach außen verlagert als andere. Damit es nicht zu Klemmungen im Bereich des Abdichtdorns kommt, besitzt der Abdichtdorn eine entsprechend große, ebene, d.h. stumpfe, Anlagefläche. Es wird auf besondere Dichtmittel zur Reduzierung der Leckagen im Übergangsbereich zwischen dem Abdichtdorn und dem Hohlprofil verzichtet. Diese Art der leckagentoleranten Abdichtung hat den Vorteil, dass die Enden des Hohlprofils nicht besonders vorbereitet werden müssen, um das Highspeed-Hydroformverfahren durchführen zu können und dass die Enden der fertig hydrogeformten Hohlprofile nicht abgeschnitten werden müssen. Dadurch kann Material eingespart werden.Because the hollow profile should initially be as completely as possible surrounded by a fluid cushion, it is expedient to make the end of the sealing mandrel blunt. In the context of the invention, a blunt seal is understood to mean a sealing mandrel having an end face perpendicular to the longitudinal direction without projections or depressions which are particularly adapted to the inner contour of the hollow profile. This standing perpendicular to the feed direction end face extends over a much larger area than the mere wall thickness of the reshaped hollow sections, and that because the hollow sections not close to the final contour, but selectively corrugated to form the fluid cushion and in particular at a distance from the walls of the mold cavity. Some peripheral regions of the hollow profile are therefore displaced much more radially outward than the other during hydroforming. So that it does not come to clamping in the sealing mandrel, the sealing mandrel has a correspondingly large, flat, ie dull, contact surface. It is dispensed with special sealant to reduce the leakage in the transition region between the sealing mandrel and the hollow profile. This type of leak-tight seal has the advantage that the ends of the hollow profile need not be specially prepared to perform the high-speed hydroforming process and that the ends of the finished hydroformed hollow sections need not be cut off. This can save material.
Es wird als vorteilhaft angesehen, wenn das Obergesenk beim Schließen des Formhohlraums weniger als den zwanzigsten Teil der Fluidmenge verdrängt, in welcher sich das Untergesenk befindet. Das Verhältnis zwischen verdrängtem Volumen und dem Badvolumen muss hinreichend groß gewählt werden. Einerseits treten bei dem erfindungsgemäßen Verfahren sehr hohe Drücke auf, wobei Leckageströme zurück in das Fluidbad fließen. Damit das Hydraulikfluid nicht unkontrolliert herausspritzt, kann der Leckagestrom durch eine entsprechende Menge Hydraulikfluid gedämpft werden. Dazu sollten die Leckagestellen tief genug unter dem Fluidpegel liegen. Zusätzliche Abschirmmaßnahmen sind zweckmäßig.It is considered advantageous if the upper die displaces less than the twentieth part of the fluid quantity in which the lower die is located when closing the mold cavity. The ratio between displaced volume and the bath volume must be chosen sufficiently large. On the one hand, very high pressures occur in the method according to the invention, with leakage flows flowing back into the fluid bath. So that the hydraulic fluid does not spray out in an uncontrolled manner, the leakage flow can be damped by a corresponding amount of hydraulic fluid. For this purpose, the leakage points should be low enough below the fluid level. Additional shielding measures are appropriate.
Das kontrollierte Ableiten des Hydraulikfluids aus dem Fluidpolster kann dadurch erfolgen, dass zwischen dem Obergesenk und dem Untergesenk ein definierter Spalt vorgesehen ist, welcher an den Formhohlraum grenzt. Mit anderen Worten wird in der Trennungsfuge zwischen Obergesenk und Untergesenk ein Spalt eingestellt, der gerade so viel Hydraulikfluid abströmen lässt, dass bei Abschluss des Nachführvorgangs des Abdichtdorns das Fluidpolster vollständig abgebaut ist. Alternativ oder zusätzlich können Riefen im Formhohlraum vorgesehen sein, über welche das Hydraulikfluid abgeleitet wird. Dies erfolgt zweckmäßigerweise in Richtung des Abdichtdorns, da hier ohnehin größere Leckageströme auftreten können.The controlled discharge of the hydraulic fluid from the fluid cushion can be effected by providing a defined gap between the upper die and the lower die which adjoins the mold cavity. In other words, a gap is set in the parting line between the upper die and the lower die, which just allows enough hydraulic fluid to flow out so that the fluid cushion is completely dismantled at the conclusion of the follow-up operation of the sealing mandrel. Alternatively or additionally, grooves may be provided in the mold cavity, via which the hydraulic fluid is discharged. This is expediently carried out in the direction of the sealing mandrel, since larger leakage flows can occur here anyway.
Die Hydraulikflüssigkeit kann temperiert sein, so dass die aus einem metallischen Werkstoff bestehenden Hohlprofile gewissermaßen warm mittels eines Highspeed-Hydroformverfahrens umgeformt werden. Das Halbwarm- oder Warmumformen von Metall erhöht die Umformbarkeit. Mit steigender Temperatur des Fluidbads erwärmt sich das Hohlprofil schneller, so dass die sich anschließende Innenhochdruck-Umformoperation ebenfalls beschleunigt durchgeführt werden kann. Das Erwärmen im Fluidbad hat den Vorteil, dass die Hohlprofile mit einem das Hohlprofil unmittelbar kontaktierenden Medium konduktiv erwärmt werden können. Diese Methode ist auf Grund der hohen Wärmeleitfähigkeit von Flüssigkeiten effektiver als die Ofenerwärmung.The hydraulic fluid may be tempered, so that the existing of a metallic material hollow profiles are transformed to a certain extent warm by means of a high-speed hydroforming process. The warm or hot forming of metal increases the formability. With increasing temperature of the fluid bath, the hollow profile heats up faster, so that the subsequent hydroforming operation can also be carried out accelerated. The heating in the fluid bath has the advantage that the hollow profiles can be conductively heated with a medium contacting the hollow profile directly. This method is more effective than oven heating due to the high thermal conductivity of liquids.
Die Erfindung ist nachfolgend anhand in den Zeichnungen dargestellter Ausführungsbeispiele näher erläutert. Es zeigt:
Figur 1- eine schematische Darstellung einer Vorrichtung zur Durchführung des Verfahrens;
Figur 2- einen Querschnitt durch den Formhohlraum einer Hydroformstation;
- Figuren 3a bis 3c
- einen Teilbereich eines Längsschnitts durch einen Formhohlraum einer Hydroformstation zu drei unterschiedlichen Bearbeitungszeitpunkten;
- Figur 4
- entsprechend der Darstellung der
Figur 3c eine Variante mit Leckagebereichen am Abdichtdorn und Figur 5- ein Diagramm, bei welchem über der Zeit die Bewegungskurve des Abdichtdorns, der anliegende Druck zur Innenhochdruckumformung und die Dicke des Fluidpolsters aufgetragen ist.
- FIG. 1
- a schematic representation of an apparatus for performing the method;
- FIG. 2
- a cross section through the mold cavity of a hydroforming station;
- FIGS. 3a to 3c
- a partial region of a longitudinal section through a mold cavity of a hydroforming station at three different processing times;
- FIG. 4
- according to the representation of
Figure 3c a variant with leakage areas on the sealing mandrel and - FIG. 5
- a diagram in which over time the movement curve of the sealing mandrel, the applied pressure for hydroforming and the thickness of the fluid cushion is plotted.
In der Vorformstation 5 der Hydroformstation 6 und der Endbearbeitungsstation 7 erfolgt die eigentliche Bearbeitung des Hohlprofils 10. Hierzu besitzt die Presse 1 einen Pressenstößel 14, an welchem entsprechende Obergesenke für die jeweiligen Bearbeitungsstationen 5, 6 und 7 angeordnet sind. An dem Obergesenk 15 der Hydroformstation 6 ist eine Kolben-Zylinder-Einheit 16 angeordnet, die dazu dient, während der Innenhochdruckumformung Hydraulikfluid in den Innenraum des Hohlprofils 10 zu pressen. Die Presse 1 ist in nicht näher dargestellter Weise mit einem Drucksteuerungssystem und einer Druckregelung verbunden, insbesondere, wie sie in der
Der in
Die
Wesentlich bei dem erfindungsgemäßen Verfahren ist die Geschwindigkeit, mit der das Fluidpolster abgebaut wird. Dies soll anhand des Diagramms der
Die Kurve K2 zeigt den Weg, d.h. den Hub, einer mechanischen Presse. Bei der hier verwendeten Presse, bei welcher das Obergesenk mit einer zusätzlichen Kolben-Zylinder-Einheit 16 zur Druckerzeugung ausgebildet ist, fährt der Pressenhub, nachdem er seinen unteren Totpunkt B1 erreicht hat, weiter in Richtung des in dem Diagramm nicht darstellbaren oberen Totpunktes über die Druckabfallspunkte C1 und D1. Zwischen dem unteren Totpunkt B1 des Pressenhubs, der Kurve K1 und dem Druckabfallspunkt C1 wird die Presse noch zugehalten. Ab dem Druckabfallspunkt C1 fährt die Presse auf, der Druck wird abgebaut und die Presse 1 öffnet das Hydroformwerkzeug in Punkt D1. Der nicht dargestellte obere Totpunkt OT wird ohne Zeitverzögerung durchfahren. Die Kurve K2 zeigt den Druckverlauf einer Presse, wie sie in der
Die Kurve K3 ist eine Bewegungskurve des Abdichtdorns 22. In der ersten Bewegungsphase im Bereich 0 bis R wird durch das umzuformende Hohlprofil relativ wenig Widerstand geleistet. In dieser Zeitspanne gibt es ein ausreichendes Fluidpolster zwischen dem Hohlprofil und dem Formhohlraum. Das Teilstück R-S ist normalerweise die kritische Strecke der gesamten Bewegungskurve, weil in diesem Bereich das Hydraulikfluid schnell aus dem Fluidpolster abfließt, da sich das Hohlprofil 10 in dieser Phase an den Formhohlraum anlegt. In der Phase S-T hält der Abdichtdorn 22 seine Position, bis er schließlich wieder zurückgefahren wird (T-D2).The curve K3 is a movement curve of the sealing
Die Kurve K4 verdeutlicht die Dicke eines Fluidpolsters. Es ist zu erkennen, dass die Dicke zwischen dem Punkt G und dem Punkt H relativ rasch abnimmt und insbesondere gegen Null geht, bevor der Abdichtdorn den Bereich R-S der Bewegungskurve vollständig durchfahren hat. Das bedeutet, dass die Flüssigkeit schnell abfließt. Es kommt zu erhöhter Reibung zwischen dem Werkstück und dem Werkzeug und zu den diskutierten Nachteilen. Erfindungsgemäß ist vorgesehen, dass sich die Dicke des Fluidpolsters wesentlich langsamer reduziert, wie durch die Kurve K5 dargestellt ist. Es ist zu erkennen, dass der Abdichtdorn den Bereich R-S bereits durchfahren hat, während das Fluidpolster noch nicht einmal auf 50 % seiner Dicke reduziert worden ist. Erst im Punkt J, der zeitlich nach dem Ende des Nachführvorgangs des Abdichtdorns liegt, geht die Dicke des Fluidpolsters gegen Null. Zu diesem Zeitpunkt findet allerdings keine Reibung mehr zwischen dem Werkstück und dem Werkzeug statt, so dass das Fluidpolster nicht weiter benötigt wird. Entscheidend ist somit, dass der Punkt J der Kurve K5 auf der Zeitachse auf der rechten Seite des Punktes S liegt, welcher den Endpunkt des Nachführvorgangs des Abdichtdorns kennzeichnet.The curve K4 illustrates the thickness of a fluid cushion. It can be seen that the thickness between the point G and the point H decreases relatively rapidly and in particular goes to zero, before the sealing mandrel has completely passed through the region R-S of the movement curve. This means that the liquid drains off quickly. There is increased friction between the workpiece and the tool and the disadvantages discussed. According to the invention, it is provided that the thickness of the fluid cushion is reduced much more slowly, as shown by the curve K5. It can be seen that the sealing mandrel has already passed through the region R-S, while the fluid cushion has not even been reduced to 50% of its thickness. Only at the point J, which is temporally after the end of the Nachführvorgangs the sealing mandrel, the thickness of the fluid cushion goes to zero. At this time, however, no friction between the workpiece and the tool takes place, so that the fluid cushion is no longer needed. It is therefore crucial that the point J of the curve K5 lies on the time axis on the right side of the point S, which marks the end point of the Nachführvorgangs the sealing mandrel.
Die dargestellten Kurvenverläufe sind rein schematisch. In der Praxis können sich Kurven anstatt der eingezeichneten Geraden ergeben. Wesentlich ist die Aussage, dass die Geschwindigkeit, mit welcher das Hydraulikfluid aus dem Fluidpolster abströmt, reduziert werden soll. Daher ist die Kurve K5 flacher als die Kurve K4.The illustrated curves are purely schematic. In practice, curves may result instead of the drawn straight line. Essential is the statement that the speed with which the hydraulic fluid flows out of the fluid cushion should be reduced. Therefore, the curve K5 is flatter than the curve K4.
- 1 -1 -
- PressePress
- 2 -2 -
- Pressentischpress table
- 3 -3 -
- Tauchbeckenplunge pool
- 4 -4 -
- Befüllstationfilling station
- 5 -5 -
- Vorformstationpreform station
- 6 -6 -
- HydroformstationHydroforming station
- 7 -7 -
- Endbearbeitungsstationfinishing station
- 8 -8th -
- Rohmaterialraw material
- 9 -9 -
- Roboterrobot
- 10 -10 -
- Hohlprofilhollow profile
- 11 -11 -
- Transferbalkentransfer bars
- 12 -12 -
- Roboterrobot
- 13 -13 -
- Fertigteilprecast
- 14 -14 -
- Pressenstößelpress ram
- 15 -15 -
- Obergesenkupper die
- 16 -16 -
- Kolben-Zylinder-EinheitPiston-cylinder unit
- 17 -17 -
- Untergesenklower die
- 18 -18 -
- Formhohlraummold cavity
- 19 -19 -
- Fluidpolsterfluid cushion
- 20 -20 -
- Riefegroove
- 21 -21 -
- Spaltgap
- 22 -22 -
- Abdichtdornsealing mandrel
- 23-23-
- Kanalchannel
- K1-K1
- KurveCurve
- K2 -K2 -
- KurveCurve
- K3 -K3 -
- KurveCurve
- K4 -K4 -
- KurveCurve
- K5 -K5 -
- KurveCurve
- L -L -
- Leckagebereichleakage area
- P -P -
- Innendruckinternal pressure
- P1 -P1 -
- Pfeilarrow
- W -W -
- Wegpath
Claims (9)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009030089A DE102009030089B3 (en) | 2009-06-22 | 2009-06-22 | Process for hydroforming |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2272601A1 true EP2272601A1 (en) | 2011-01-12 |
EP2272601B1 EP2272601B1 (en) | 2011-08-31 |
Family
ID=42932659
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10004775A Not-in-force EP2272601B1 (en) | 2009-06-22 | 2010-05-06 | Hydroforming method |
Country Status (4)
Country | Link |
---|---|
US (1) | US20100319428A1 (en) |
EP (1) | EP2272601B1 (en) |
AT (1) | ATE522295T1 (en) |
DE (1) | DE102009030089B3 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103846332A (en) * | 2014-03-02 | 2014-06-11 | 首钢总公司 | Intelligent inner high-pressure forming method suitable for different length tubes |
WO2016198396A1 (en) | 2015-06-08 | 2016-12-15 | Constellium Singen Gmbh | Precision forming of metallic hollow extrusions |
DE102022125956A1 (en) | 2022-10-07 | 2024-04-18 | Fischer Hydroforming Gmbh | Method for forming a metallic hollow body blank by means of internal high-pressure forming |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN111203469B (en) * | 2019-03-04 | 2022-06-28 | 航宇智造(北京)工程技术有限公司 | Metal pipe hot gas bulging and rapid cooling strengthening die assembly |
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GB2126510A (en) * | 1982-08-27 | 1984-03-28 | Vitkovice Zdarske Strojirny A | Tool for manufacture of shaped workpieces |
DE4017072A1 (en) * | 1990-05-26 | 1991-11-28 | Benteler Werke Ag | METHOD FOR HYDRAULIC FORMING A TUBULAR HOLLOW BODY AND DEVICE FOR CARRYING OUT THE METHOD |
FR2679159A1 (en) * | 1991-07-18 | 1993-01-22 | Thiberge Louis | Hydroforming method and device for implementing it |
DE102005057863B3 (en) | 2005-12-02 | 2006-08-17 | Benteler Automobiltechnik Gmbh | Hydraulic press for manufacture of automotive components has pressure regulation system consisting of a piston-cylinder and spring unit |
DE202007004627U1 (en) * | 2006-03-27 | 2007-08-30 | Forschungsgesellschaft Umformtechnik Mbh | Internal high pressure molding system has retaining unit which exerts force on molding tool to hold it in place during molding |
EP2036628A1 (en) * | 2007-09-12 | 2009-03-18 | Bernd Schulze | Device and method for creating a workpiece with convexity using a pressure medium |
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US6128936A (en) * | 1998-09-09 | 2000-10-10 | Kabushiki Kaisha Opton | Bulging device and bulging method |
DE19845186A1 (en) * | 1998-10-01 | 2000-04-13 | Binder Technologie Ag Gams | Fluid form |
US6532785B1 (en) * | 2001-11-20 | 2003-03-18 | General Motors Corporation | Method and apparatus for prefilling and hydroforming parts |
US7266982B1 (en) * | 2005-06-10 | 2007-09-11 | Guza David E | Hydroforming device and method |
-
2009
- 2009-06-22 DE DE102009030089A patent/DE102009030089B3/en active Active
-
2010
- 2010-05-06 AT AT10004775T patent/ATE522295T1/en active
- 2010-05-06 EP EP10004775A patent/EP2272601B1/en not_active Not-in-force
- 2010-06-21 US US12/819,338 patent/US20100319428A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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GB2126510A (en) * | 1982-08-27 | 1984-03-28 | Vitkovice Zdarske Strojirny A | Tool for manufacture of shaped workpieces |
DE4017072A1 (en) * | 1990-05-26 | 1991-11-28 | Benteler Werke Ag | METHOD FOR HYDRAULIC FORMING A TUBULAR HOLLOW BODY AND DEVICE FOR CARRYING OUT THE METHOD |
FR2679159A1 (en) * | 1991-07-18 | 1993-01-22 | Thiberge Louis | Hydroforming method and device for implementing it |
DE102005057863B3 (en) | 2005-12-02 | 2006-08-17 | Benteler Automobiltechnik Gmbh | Hydraulic press for manufacture of automotive components has pressure regulation system consisting of a piston-cylinder and spring unit |
DE202007004627U1 (en) * | 2006-03-27 | 2007-08-30 | Forschungsgesellschaft Umformtechnik Mbh | Internal high pressure molding system has retaining unit which exerts force on molding tool to hold it in place during molding |
EP2036628A1 (en) * | 2007-09-12 | 2009-03-18 | Bernd Schulze | Device and method for creating a workpiece with convexity using a pressure medium |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103846332A (en) * | 2014-03-02 | 2014-06-11 | 首钢总公司 | Intelligent inner high-pressure forming method suitable for different length tubes |
CN103846332B (en) * | 2014-03-02 | 2015-11-18 | 首钢总公司 | A kind of intellectuality adapts to the inside high-pressure forming method of different length pipe |
WO2016198396A1 (en) | 2015-06-08 | 2016-12-15 | Constellium Singen Gmbh | Precision forming of metallic hollow extrusions |
US10981206B2 (en) | 2015-06-08 | 2021-04-20 | Constellium-Singen Gmbh | Precision forming of metallic hollow extrusions |
DE102022125956A1 (en) | 2022-10-07 | 2024-04-18 | Fischer Hydroforming Gmbh | Method for forming a metallic hollow body blank by means of internal high-pressure forming |
Also Published As
Publication number | Publication date |
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EP2272601B1 (en) | 2011-08-31 |
US20100319428A1 (en) | 2010-12-23 |
ATE522295T1 (en) | 2011-09-15 |
DE102009030089B3 (en) | 2010-11-11 |
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