EP1063029B1 - Method for hydroforming a hollow workpiece - Google Patents
Method for hydroforming a hollow workpiece Download PDFInfo
- Publication number
- EP1063029B1 EP1063029B1 EP00109465A EP00109465A EP1063029B1 EP 1063029 B1 EP1063029 B1 EP 1063029B1 EP 00109465 A EP00109465 A EP 00109465A EP 00109465 A EP00109465 A EP 00109465A EP 1063029 B1 EP1063029 B1 EP 1063029B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- workpiece
- tool
- hydraulic fluid
- closing
- temperature
- 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.)
- Expired - Lifetime
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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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49805—Shaping by direct application of fluent pressure
Definitions
- the invention relates to a method for internal pressure molding of a hollow Workpiece made of aluminum or an aluminum alloy, according to the Features in the preamble of claim 1.
- the method of internal pressure forming of hollow, especially tubular, Workpieces within a closed tool is both at known as steel as well as non-ferrous metals. That in the Pressure fluid introduced into workpieces consists of water or a Water emulsion. The workpiece is formed at room temperature.
- EP 0 785 036 A1 it is known to hot sand into a workpiece to bring in and reshape it.
- both the workpiece and the tool are heated.
- Forming maintains the temperature of the tool and the workpiece receive.
- WO 98/54370 teaches the person skilled in the art to reshape steel, in particular boron steel. To do this, the steel is first heated to a temperature above the AC3 point, in particular to a temperature between 775 ° C and 1000 ° C, warmed up. The pressure should also be between 30 and 80 MPa, what Pressure ratios between about 300 and 800 bar mean. Closing domes as Components of lock cylinders are not disclosed.
- the object of the invention is based on the prior art based on a method for the internal pressure forming of an open end having hollow workpiece made of aluminum or an aluminum alloy to create that is safer with shorter cycle times and with reduced Forming effort a more precise forming of the workpieces with less Guaranteed temperatures and pressures.
- Nitrogen seen as a pressure fluid. Nitrogen does not cause chemical changes of the material of the workpiece and does not adhere to the inner surface of the workpiece.
- the pressure fluid allows Nitrogen, namely in the form of a pure nitrogen, which is used in the standing temperature is inert, a particularly advantageous Application. Nitrogen is essential compared to a heat transfer oil cost-effective. Also there are no more problems with nitrogen in his Circulation on the valves, pistons and seals of the entire forming device available. After all, nitrogen can get into that much faster The workpiece is filled in and removed from it.
- the temperature range of proves itself from an economic point of view 250 ° C to 350 ° C at a pressure between 180 bar and 250 bar depending on the Wall thicknesses and the configuration of the workpieces to be formed at Forming aluminum or aluminum alloys as special advantageous.
- the specific internal pressure can in the respective workpiece to be formed via a in the feed line for the Pressure fluid incorporated control valve depending on the particular Warm-up temperature of the workpiece and the heating temperature of the tool to be controlled.
- the nitrogen can be heated outside the tool.
- the tool heating is usually sufficient to switch the nitrogen to the bring the necessary operating temperature if the nitrogen has appropriate Channels in the tool into the workpiece.
- the temperature required for easier forming of the workpiece can be achieved by heating the tool.
- the workpiece can be heated in various ways become. However, it is expedient according to claim 3 that the workpiece in an oven is brought to the necessary temperature externally.
- the forming process can be carried out in a pure expansion Workpiece exist in the closed tool or according to claim 4 with be coupled to an additional displacement of at least one dome.
- This method is used especially in complex configurations, e.g. then, when a lateral formation in the course of the workpiece a so-called cathedral is to be created and material is added must become. There is usually another in the area of the cathedral axially displaceable counterforce in the form of a hydraulically influenceable Counter plunger provided in the tool.
- the pressure fluid can according to claim 5 before being introduced into the workpiece be tempered externally.
- FIG. 1 is a schematically illustrated tool for internal pressure forming a hollow workpiece 2 in the form of an aluminum tube made of AlMg3 designated.
- the S-shaped preformed workpiece 2 should be in the tool 1 final S-shaped contour with a lateral dome 3 in the middle transition section 4 received.
- the tool 1 is in both the lower die 6 shown and not in the upper die shown with a heater 7, which at Embodiment is illustrated as an electric heating coil.
- the tool 1 is hydraulic on both ends of the workpiece 2 Actuating locking cylinders 8, 9 with axially displaceable locking pins 10, 11 assigned. Of these locking pins 10, 11, the locking dome 11 is included provided a longitudinal channel 12 to which a feed line 13 for supplying a pressure fluid 14 consisting of pure nitrogen is connected. The Supply line 13 is guided via a control valve 15 with a pressure display 16.
- Both locking pins 10, 11 serve to seal the ends 17 of the workpiece 2 and the introduction of axial pushing forces, if these for Training of the cathedral 3 are required.
- the tool 1 is still a counter plunger 18 assigned as part of a hydraulically actuated cylinder 19.
- the workpiece 2 preheated in this way is then placed in the mold cavity 5 and then the locking pins 10, 11 in the ends 17 of the Workpiece 2 retracted sealing.
- the tool 1 can simultaneously with the
- the pressure fluid 14 is then pressure-controlled via the feed line 13 inserted into the workpiece 2 and thereby his plasticized material in the Mold nest 5 pressed.
- the internal pressure required here can be properly controlled via the control valve 15 Dependence on the respective warm-up temperature of the workpiece 2 and Heating temperature of tool 1 can be controlled.
- the pressure fluid 14 can be heated before being fed to the closing mandrel 11. However, since the closing mandrel 11 is also heated via the tool 1, then it suffices from tool 1 to the locking dome 11 and from the locking mandrel 11 heat transferred to the pressure fluid 14 in the longitudinal channel 12 to deal with the Adjust the temperature level of workpiece 2 and tool 1.
Description
Die Erfindung betrifft ein Verfahren zum Innendruckformen eines hohlen Werkstücks aus Aluminium oder einer Aluminiumlegierung, gemäß den Merkmalen im Oberbegriff des Anspruchs 1.The invention relates to a method for internal pressure molding of a hollow Workpiece made of aluminum or an aluminum alloy, according to the Features in the preamble of claim 1.
Die Methode des Innendruckumformens von hohlen, insbesondere rohrförmigen, Werkstücken innerhalb eines geschlossenen Werkzeugs ist sowohl bei dem Werkstoff Stahl als auch bei Nichteisenmetallen bekannt. Das in die Werkstücke eingebrachte Druckfluid besteht hierbei aus Wasser oder einer Wasseremulsion. Die Umformung des Werkstücks erfolgt bei Raumtemperatur. The method of internal pressure forming of hollow, especially tubular, Workpieces within a closed tool is both at known as steel as well as non-ferrous metals. That in the Pressure fluid introduced into workpieces consists of water or a Water emulsion. The workpiece is formed at room temperature.
Im bekannten Fall ist es nachteilig, dass eine Formänderung der metallischen Werkstoffe bei komplexen Umformschritten nur mit einem hohen technischen Aufwand möglich ist. Insbesondere bei Werkstoffen mit einer geringen plastischen Dehnung, wie z.B. Aluminium, ist dann ein mehrfaches Zwischenglühen unabdingbar. Jede Zwischenglühung beeinflusst indessen ein metallisches Gefüge. Darüberhinaus besteht bei metallischen Werkstoffen wie Aluminium, die keine Gefügeumwandlung vollziehen, bei Zwischenglühungen die Gefahr der Versprödung. Ihre Funktion im späteren praktischen Einsatz kann daher erheblich beeinträchtigt sein.In the known case, it is disadvantageous that a change in shape of the metallic Materials with complex forming steps only with a high technical Effort is possible. Especially with materials with a low plastic stretching, e.g. Aluminum, is then a multiple intermediate annealing essential. Every intermediate annealing affects metallic structure. In addition, metallic materials such as Aluminum that does not undergo structural change during intermediate annealing the danger of embrittlement. Your function in later practical use can therefore be significantly affected.
Im Umfang der EP 0 785 036 A1 ist es bekannt, heißen Sand in ein Werkstück einzubringen und dieses umzuformen. Hierbei werden vor dem Umformen sowohl das Werkstück als auch das Werkzeug erwärmt. Während der Umformung wird die Temperatur des Werkzeugs und des Werkstücks aufrecht erhalten.In the scope of EP 0 785 036 A1 it is known to hot sand into a workpiece to bring in and reshape it. Here, before forming both the workpiece and the tool are heated. During the Forming maintains the temperature of the tool and the workpiece receive.
Das Innendruckumformen mittels Sand verlangt jedoch ein spezielles Handling. Geringe Radien sind, wenn überhaupt, nur mit einem erheblichen Aufwand erzielbar. Auch ist ein einseitiges Ausformen, z.B. einen Dom, nur schwer durchführbar. Ferner gibt es erhebliche Probleme beim Abdichten sowie in Bezug auf die Standzeit des Werkzeugs. Eine hochwertige Qualität der inneren Oberfläche kann im Prinzip mit Sand nicht erzielt werden. Auch dieser Sachverhalt bedingt einen außerordentlich hohen kostenträchtigen Aufwand, der die Wirtschaftlichkeit des bekannten Verfahrens in Frage stellt.However, internal pressure forming using sand requires special handling. Small radii are, if at all, only with a considerable effort achievable. Unilateral molding, e.g. a cathedral, difficult feasible. There are also significant problems with sealing as well as in Regarding the tool life. A high quality interior In principle, surface cannot be achieved with sand. This fact too requires an extraordinarily high cost-intensive effort, which the Economics of the known method in question.
Durch die DE 196 42 824 A1 ist ein Verfahren zum Innendruckumformen eines offene Enden aufweisenden hohlen Werkstücks aus Aluminium oder einer Aluminiumlegierung in einem Formnest eines mehrteiligen Werkzeugs bekannt, bei welchem das Werkstück in das offene Werkzeug gelegt, danach in die Enden des Werkstücks Bestandteile von Schließzylindern bildende Schließdome dichtend eingeführt werden und dann das Werkzeug geschlossen wird. Im Anschluss daran wird über mindestens einen Schließdom ein Wärmeträgeröl mit einem Dampfdruck von 1 bar bei einer Temperatur von etwa 250°C in das Werkstück geleitet und dadurch das Werkstück dem Formnest im Werkzeug angepasst.DE 196 42 824 A1 describes a method for internal pressure forming Hollow workpiece made of aluminum or an open end Aluminum alloy known in a mold cavity of a multi-part tool, where the workpiece is placed in the open tool, then in the Ends of the workpiece Lock domes forming components of locking cylinders inserted sealingly and then the tool is closed. Subsequently, at least one dome is a heat transfer oil with a vapor pressure of 1 bar at a temperature of about 250 ° C Workpiece guided and thereby the workpiece the mold nest in the tool customized.
Zu diesem Verfahren ist anzumerken, dass die Taktzeiten zum Umformen eines Werkstücks vergleichsweise lang sind. Ursache hierfür bildet der Sachverhalt, dass das Druckfluid Wärmeträgeröl vorab erhitzt und dann zum Aufheizen des Werkstücks auf Umformtemperatur benutzt wird. Erst danach wird das Werkstück endseitig verschlossen und umgeformt. Auch ist durch die Verwendung von Wärmeträgeröl der Kostenfaktor vergleichsweise hoch. Des Weiteren sind mit der Verwendung von Wärmeträgeröl Dichtungsprobleme an den verschiedensten Ventilen, Kolben und Dichtungen der Umformvorrichtung im Hinblick auf die dort vorhandenen Kunststoffteile nicht zu vermeiden. Schließlich ist das Einfüllen von Wärmeträgeröl in das umzuformende Werkstück und seine Entfernung kompliziert und zeitaufwendig.Regarding this method, it should be noted that the cycle times for forming a Workpiece are comparatively long. The reason for this is the fact that the pressure fluid preheats heat transfer oil and then for heating the Workpiece at the forming temperature is used. Only then will it Workpiece closed and reshaped at the end. Is also through that Use of thermal oil the cost factor is comparatively high. Of There are also sealing problems with the use of thermal oil the various valves, pistons and seals of the forming device unavoidable in view of the plastic parts there. Finally, the filling of heat transfer oil into the one to be reformed Workpiece and its removal complicated and time consuming.
Die WO 98/54370 lehrt den Fachmann Stahl, insbesondere Borstahl, umzuformen. Dazu wird der Stahl vorab auf eine Temperatur oberhalb des AC3-Punktes, insbesondere auf eine Temperatur zwischen 775°C und 1000°C, aufgewärmt. Auch soll der Druck zwischen 30 und 80 MPa liegen, was Druckverhältnisse zwischen etwa 300 und 800 bar bedeuten. Schließdome als Bestandteile von Schließzylindern werden nicht offenbart.WO 98/54370 teaches the person skilled in the art to reshape steel, in particular boron steel. To do this, the steel is first heated to a temperature above the AC3 point, in particular to a temperature between 775 ° C and 1000 ° C, warmed up. The pressure should also be between 30 and 80 MPa, what Pressure ratios between about 300 and 800 bar mean. Closing domes as Components of lock cylinders are not disclosed.
Der Erfindung liegt - ausgehend vom Stand der Technik - die Aufgabe zugrunde, ein Verfahren zum Innendruckumformen eines offene Enden aufweisenden hohlen Werkstücks aus Aluminium oder einer Aluminiumlegierung zu schaffen, das bei kürzeren Taktzeiten sicherer ist und bei vermindertem Umformaufwand ein exakteres Umformen der Werkstücke bei geringeren Temperaturen und Drücken gewährleistet.The object of the invention is based on the prior art based on a method for the internal pressure forming of an open end having hollow workpiece made of aluminum or an aluminum alloy to create that is safer with shorter cycle times and with reduced Forming effort a more precise forming of the workpieces with less Guaranteed temperatures and pressures.
Diese Aufgabe wird mit den im Anspruch 1 angegebenen Merkmalen gelöst. This object is achieved with the in claim 1 specified features solved.
Wichtig an dem neuen Verfahren ist zunächst die Tatsache, dass das Werkzeug vor dem Einlegen des Werkstücks aufgeheizt wird. Hierdurch kann die Umformung schneller vonstatten gehen, weil weniger Umformdruck aufgebracht werden muss. Die Taktzeiten werden verkürzt.What is important about the new process is the fact that the Tool is heated before inserting the workpiece. This can the forming process is faster because there is less forming pressure must be applied. The cycle times are shortened.
Dadurch, dass auch mindestens ein Schließdorn beim Aufheizen des Werkzeugs gleichzeitig mit erwärmt wird, sind die Stirnseiten des Werkstücks keinen kalten Bereichen des Werkzeugs mehr ausgesetzt. Dies trägt ebenfalls zu einer schnelleren und einfacheren Umformung des Werkstücks bei.The fact that at least one closing mandrel when heating the The end faces of the workpiece are the tool that is heated at the same time no longer exposed to cold areas of the tool. This also bears for faster and easier forming of the workpiece.
Hierbei ist ferner zu beachten, dass es sich bei dem in Rede stehenden Umformwerkzeug durchweg um ein Bauteil mit einer großen Werkstoffmasse handelt.It should also be noted that this is the one in question Forming tool consistently around a component with a large material mass is.
Ein weiterer wesentlicher Vorteil der Erfindung wird in der Verwendung von Stickstoff als Druckfluid gesehen. Stickstoff führt keine chemischen Veränderungen des Werkstoffs des Werkstücks herbei und haftet auch nicht an der inneren Oberfläche des Werkstücks. Außerdem erlaubt das Druckfluid Stickstoff, und zwar in Form eines reinen Stickstoffs, der sich bei der in Rede stehenden Temperatur reaktionsträge verhält, eine besonders vorteilhafte Anwendung. Stickstoff ist im Vergleich zu einem Wärmeträgeröl wesentlich kostengünstiger. Auch sind mit Stickstoff keine Probleme mehr in seinem Kreislauf an den Ventilen, Kolben und Dichtungen der gesamten Umformvorrichtung vorhanden. Schließlich kann Stickstoff wesentlich schneller in das Werkstück eingefüllt und aus diesem auch wieder abgezogen werden.Another major advantage of the invention is the use of Nitrogen seen as a pressure fluid. Nitrogen does not cause chemical changes of the material of the workpiece and does not adhere to the inner surface of the workpiece. In addition, the pressure fluid allows Nitrogen, namely in the form of a pure nitrogen, which is used in the standing temperature is inert, a particularly advantageous Application. Nitrogen is essential compared to a heat transfer oil cost-effective. Also there are no more problems with nitrogen in his Circulation on the valves, pistons and seals of the entire forming device available. After all, nitrogen can get into that much faster The workpiece is filled in and removed from it.
Unter wirtschaftlichen Gesichtspunkten erweist sich der Temperaturbereich von 250 °C bis 350°C bei einem Druck zwischen 180 bar und 250 bar je nach den Wanddicken und der Konfiguration der umzuformenden Werkstücke bei der Umformung von Aluminium oder Aluminiumlegierungen als besonders vorteilhaft. Insbesondere unter diesem Aspekt kann der spezifische Innendruck in dem jeweiligen umzuformenden Werkstück über ein in die Zuleitung für das Druckfluid eingegliedertes Regelventil in Abhängigkeit von der jeweiligen Aufwärmtemperatur des Werkstücks und der Heiztemperatur des Werkzeugs gesteuert werden.The temperature range of proves itself from an economic point of view 250 ° C to 350 ° C at a pressure between 180 bar and 250 bar depending on the Wall thicknesses and the configuration of the workpieces to be formed at Forming aluminum or aluminum alloys as special advantageous. In this aspect in particular, the specific internal pressure can in the respective workpiece to be formed via a in the feed line for the Pressure fluid incorporated control valve depending on the particular Warm-up temperature of the workpiece and the heating temperature of the tool to be controlled.
Die Erwärmung des Stickstoffs kann außerhalb des Werkzeugs erfolgen. In der Regel genügt jedoch die Werkzeugbeheizung, um den Stickstoff auf die notwendige Betriebstemperatur zu bringen, wenn der Stickstoff über entsprechende Kanäle im Werkzeug in das Werkstück geleitet wird.The nitrogen can be heated outside the tool. In the However, the tool heating is usually sufficient to switch the nitrogen to the bring the necessary operating temperature if the nitrogen has appropriate Channels in the tool into the workpiece.
Auch die zum leichteren Umformen des Werkstücks erforderliche Temperatur
kann über die Beheizung des Werkzeugs erzielt werden. Eine vorteilhafte
Verfahrensweise, insbesondere in der Serienfertigung, besteht gemäß
Anspruch 2 aber darin, dass das Werkstück vor dem Einbringen in das
Werkzeug auf die zweckmäßige Temperatur gebracht wird.Also the temperature required for easier forming of the workpiece
can be achieved by heating the tool. An advantageous one
The procedure, in particular in series production, exists according to
Die Erwärmung des Werkstücks kann in verschiedener Weise durchgeführt
werden. Zweckmäßig ist es jedoch gemäß Anspruch 3, dass das Werkstück in
einem Ofen extern auf die notwendige Temperatur gebracht wird.The workpiece can be heated in various ways
become. However, it is expedient according to
Der Umformprozess kann nach der Erfindung in einem reinen Aufweiten eines Werkstücks im geschlossenen Werkzeug bestehen oder gemäß Anspruch 4 mit einem zusätzlichen Verlagern zumindest eines Schließdoms gekoppelt sein. Diese Methode wird insbesondere bei komplexen Konfigurationen angewandt, z.B. dann, wenn im Verlauf des Werkstücks eine seitliche Ausformung in Form eines sogenannten Doms erzeugt werden soll und Material nachgeschoben werden muss. Hier wird außerdem im Bereich des Doms meistens eine weitere axial verlagerbare Gegenkraft in Form eines hydraulisch beeinflussbaren Gegenhaltestößels im Werkzeug vorgesehen.According to the invention, the forming process can be carried out in a pure expansion Workpiece exist in the closed tool or according to claim 4 with be coupled to an additional displacement of at least one dome. This method is used especially in complex configurations, e.g. then, when a lateral formation in the course of the workpiece a so-called cathedral is to be created and material is added must become. There is usually another in the area of the cathedral axially displaceable counterforce in the form of a hydraulically influenceable Counter plunger provided in the tool.
Das Druckfluid kann gemäß Anspruch 5 vor dem Einleiten in das Werkstück extern temperiert werden.The pressure fluid can according to claim 5 before being introduced into the workpiece be tempered externally.
Die Erfindung ist nachfolgend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. The invention is described below with reference to one in the drawing Embodiment explained in more detail.
Mit 1 ist ein schematisch veranschaulichtes Werkzeug zum Innendruckumformen
eines hohlen Werkstücks 2 in Form eines Aluminiumrohrs aus AlMg3
bezeichnet. Das S-förmig vorgeformte Werkstück 2 soll im Werkzeug 1 seine
endgültige S-förmige Kontur mit einem seitlichen Dom 3 im mittleren Übergangsabschnitt
4 erhalten. Dazu ist im Werkzeug 1 ein entsprechend
gestaltetes Formnest 5 vorgesehen.With 1 is a schematically illustrated tool for internal pressure forming
a
Das Werkzeug 1 ist sowohl im dargestellten Untergesenk 6 als auch im nicht
näher dargestellten Obergesenk mit einer Heizung 7 versehen, die beim
Ausführungsbeispiel als elektrische Heizspirale veranschaulicht ist.The tool 1 is in both the
Dem Werkzeug 1 sind zu beiden Stirnseiten des Werkstücks 2 hydraulisch
beaufschlagbare Schließzylinder 8, 9 mit axial verlagerbaren Schließdornen 10,
11 zugeordnet. Von diesen Schließdornen 10, 11 ist der Schließdom 11 mit
einem Längskanal 12 versehen, an den eine Zuleitung 13 zur Zuführung eines
aus reinem Stickstoff bestehenden Druckfluids 14 angeschlossen ist. Die
Zuleitung 13 ist über ein Regelventil 15 mit Druckanzeige 16 geführt.The tool 1 is hydraulic on both ends of the
Beide Schließdorne 10, 11 dienen der Abdichtung der Enden 17 des Werkstücks
2 sowie der Einleitung axialer Nachschiebekräfte, falls diese zur
Ausbildung des Doms 3 erforderlich sind.Both
Zwecks Fertigung des Doms 3 ist dem Werkzeug 1 noch ein Gegenhaltestößel
18 als Bestandteil eines hydraulisch beaufschlagbaren Zylinders 19 zugeordnet.For the manufacture of the
Bei der Innendruckumformung des Werkstücks 2 wird parallel zu der Aufheizung
des Formnests 5 im Werkzeug 1 das Werkstück 2 in einem nicht näher
dargestellten Ofen extern auf eine Temperatur zwischen 250 °C und 350 °C
gebracht. Dieselbe Temperatur hat auch das Werkzeug 1.When the internal pressure is formed on the
Das derart vorab erwärmte Werkstück 2 wird dann in das Formnest 5 gelegt
und anschließend werden die Schließdorne 10, 11 in die Enden 17 des
Werkstücks 2 dichtend eingefahren. Das Werkzeug 1 kann gleichzeitig mit dem The
Einfahren der Schließdorne 10, 11 in die Enden 17 geschlossen werden oder es
kann vorher verschlossen werden.Retracting the locking
Im Anschluss daran wird über die Zuleitung 13 das Druckfluid 14 druckgeregelt
in das Werkstück 2 eingeführt und dadurch sein plastifizierter Werkstoff in das
Formnest 5 gepresst.The
Der hierbei notwendige Innendruck kann über das Regelventil 15 einwandfrei in
Abhängigkeit von der jeweiligen Aufwärmtemperatur des Werkstücks 2 und der
Heiztemperatur des Werkzeugs 1 gesteuert werden.The internal pressure required here can be properly controlled via the
Das Druckfluid 14 kann vor dem Zuführen zum Schließdorn 11 erwärmt werden.
Da jedoch auch der Schließdorn 11 über das Werkzeug 1 mit erwärmt wird,
genügt die dann vom Werkzeug 1 auf den Schließdom 11 und vom Schließdorn
11 auf das Druckfluid 14 im Längskanal 12 übertragene Wärme, um sich dem
Temperaturniveau von Werkstück 2 und Werkzeug 1 anzupassen. The
- 1 -1 -
- WerkzeugTool
- 2 -2 -
- Werkstückworkpiece
- 3 -3 -
- Dom an 2Cathedral on 2nd
- 4 -4 -
- Übergangsabschnitt v. 2Transition section v. 2
- 5 -5 -
- Formnest in 1Form nest in 1
- 6 -6 -
- Untergesenk v. 1Lower die v. 1
- 7 -7 -
- Heizungheater
- 8 -8th -
- Schließzylinderlock cylinder
- 9 -9 -
- Schließzylinderlock cylinder
- 10 -10 -
- Schließdorn v. 8Closing pin v. 8th
- 11 -11 -
- Schließdorn v. 9Closing pin v. 9
- 12 -12 -
- Längskanal in 11Longitudinal channel in 11
- 13 -13 -
- Zuleitung zu 12Supply line to 12
- 14 -14 -
- Druckfluidpressure fluid
- 15 -15 -
- Regelventilcontrol valve
- 16 -16 -
- Druckanzeigepressure indicator
- 17 -17 -
- Enden v. 2Ends of 2
- 18 -18 -
- GegenhaltestößelCounter holding plunger
- 19 -19 -
- hydr. Zylinderhydr. cylinder
Claims (5)
- Process for hydroforming a hollow aluminium or aluminium alloy workpiece (2) which has open ends (17) in a mould cavity (5) of a multipart tool (1), wherein the workpiece (2) is placed in the open, previously heated tool (1), after which closing mandrels (10, 11) forming constituents of closing cylinders (8, 9) are sealingly introduced into the ends (17) of the workpiece (2) and the tool (1) is then closed, whereupon by way of at least one closing mandrel (10, 11) a hydraulic fluid (14) is passed into the workpiece (2) and the material of the workpiece (2) is pressed into the mould cavity (5) under the influence of the hydraulic fluid (14), characterised in that nitrogen is passed as a hydraulic fluid (14) into the warm plasticised workpiece (2) by way of the closing mandrel (10, 11) which is also heated by the heating of the tool (1), and the workpiece (2) is pressed into the mould cavity (5) in a temperature range between 250°C and 350°C at a pressure between 180 bar and 250 bar, the specific internal pressure being controlled by a regulating valve (15) incorporated in the supply line (13) for the hydraulic fluid (14) subject to each warm-up temperature of the workpiece (2) and the heating temperature of the tool (1).
- Process according to claim 1, characterised in that the workpiece (2) is heated prior to insertion in the tool (1).
- Process according to claim 1 or 2, characterised in that the workpiece (2) is externally heated in an oven.
- Process according to one of claims 1 to 3, characterised in that when the nitrogen (14) is introduced at least one closing mandrel (11) is moved into the workpiece (2).
- Process according to one of claims 1 to 4, characterised in that the hydraulic fluid (14) is external tempered prior to introduction into the workpiece (2).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19928873A DE19928873B4 (en) | 1999-06-24 | 1999-06-24 | Method and device for the internal pressure molding of a hollow metallic workpiece made of aluminum or an aluminum alloy |
| DE19928873 | 1999-06-24 | ||
| US09/651,349 US6349583B1 (en) | 1999-06-24 | 2000-08-29 | Method and device for forming a hollow metallic workpiece by inner pressure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1063029A1 EP1063029A1 (en) | 2000-12-27 |
| EP1063029B1 true EP1063029B1 (en) | 2004-11-10 |
Family
ID=26053906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00109465A Expired - Lifetime EP1063029B1 (en) | 1999-06-24 | 2000-05-04 | Method for hydroforming a hollow workpiece |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US6349583B1 (en) |
| EP (1) | EP1063029B1 (en) |
| DE (1) | DE19928873B4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109689241A (en) * | 2016-07-11 | 2019-04-26 | 萨帕公司 | The molding roof rail of thermometal gas and its manufacturing method |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6322645B1 (en) * | 1999-09-24 | 2001-11-27 | William C. Dykstra | Method of forming a tubular blank into a structural component and die therefor |
| US7024897B2 (en) * | 1999-09-24 | 2006-04-11 | Hot Metal Gas Forming Intellectual Property, Inc. | Method of forming a tubular blank into a structural component and die therefor |
| US6701764B2 (en) * | 2001-09-27 | 2004-03-09 | Siemens Westinghouse Power Corporation | Method of expanding an intermediate portion of a tube using an outward radial force |
| JP2003126923A (en) | 2001-10-24 | 2003-05-08 | Honda Motor Co Ltd | Method of forming tubular member |
| DE10162440A1 (en) * | 2001-12-19 | 2003-07-03 | Bayerische Motoren Werke Ag | forming press |
| KR20040031175A (en) * | 2002-10-04 | 2004-04-13 | 주식회사 성우하이텍 | A method for warm hydro-forming of aluminium alloy and device thereof |
| US7266982B1 (en) | 2005-06-10 | 2007-09-11 | Guza David E | Hydroforming device and method |
| US20070128443A1 (en) * | 2005-10-13 | 2007-06-07 | Hoggan Steven C | Method for altering the shape of a tube |
| US8448487B2 (en) | 2008-10-16 | 2013-05-28 | The Coca-Cola Company | Vessel forming station |
| MX348820B (en) | 2011-12-30 | 2017-06-30 | Coca Cola Co | System and method for forming a metal beverage container using blow molding. |
| CN102641937B (en) * | 2012-02-29 | 2014-08-27 | 佛山市顺德区燉煌五金塑料实业有限公司 | Y-shaped tee joint forming equipment with support die |
| WO2014201473A2 (en) * | 2013-06-14 | 2014-12-18 | The Coca-Cola Company | Multi blow molded metallic container related applications |
| JP6586157B2 (en) | 2014-03-25 | 2019-10-02 | モンテベロ テクノロジー サービシズ リミテッド | Method for blow molding metal containers |
| MX2017008619A (en) | 2014-12-30 | 2018-03-28 | Montebello Tech Services Ltd | Impact extrusion method, tooling and product. |
| CZ2016574A3 (en) | 2016-09-19 | 2018-03-28 | Západočeská Univerzita V Plzni | A method of production of hollow bodies and a device for implementing this method |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5640652B2 (en) * | 1973-10-02 | 1981-09-22 | ||
| DE2941972A1 (en) * | 1979-10-17 | 1981-04-30 | Thyssen Industrie Ag, 4300 Essen | Producing shaped hollow metal rear axle - by pressurising heated tube in split form by hot gas, gas may be applied explosively and form heated |
| US4437326A (en) * | 1982-06-07 | 1984-03-20 | Carlson Arne H | Bulge forming method and apparatus |
| DE3543523A1 (en) * | 1985-12-10 | 1987-06-11 | Messerschmitt Boelkow Blohm | METHOD FOR PRODUCING CONTAINERS BY SUPERPLASTIC FORMING |
| US5214948A (en) * | 1991-12-18 | 1993-06-01 | The Boeing Company | Forming metal parts using superplastic metal alloys and axial compression |
| US5649439A (en) * | 1994-04-15 | 1997-07-22 | The Boeing Co. | Tool for sealing superplastic tube |
| DE19530056B4 (en) * | 1995-08-16 | 2004-09-09 | Schuler Hydroforming Gmbh & Co. Kg | Method and device for producing T-shaped or at least one dome-like hollow body |
| DE29601019U1 (en) * | 1996-01-22 | 1997-05-22 | Bartels Hermann A | Device for deforming hollow profile workpieces |
| DE19642824A1 (en) * | 1996-10-17 | 1998-04-23 | Hermann Bartels | Method and device for deforming metal hollow profile workpieces |
| US5992197A (en) * | 1997-03-28 | 1999-11-30 | The Budd Company | Forming technique using discrete heating zones |
| SE508902C2 (en) * | 1997-05-30 | 1998-11-16 | Accra Teknik Ab | Process for making hardened metallic hollow bodies of thin-walled steel sheet by blow molding |
| GB9727063D0 (en) * | 1997-12-23 | 1998-02-18 | Gkn Sankey Ltd | A hydroforming process |
| US5960658A (en) * | 1998-02-13 | 1999-10-05 | Jac Products, Inc. | Method of blow molding |
| FR2787357B1 (en) * | 1998-12-18 | 2001-03-16 | Tubes Et Formes | METHOD AND APPARATUS FOR HYDROFORMING AN INCLINED PIPE FROM A METAL TUBE |
-
1999
- 1999-06-24 DE DE19928873A patent/DE19928873B4/en not_active Expired - Fee Related
-
2000
- 2000-05-04 EP EP00109465A patent/EP1063029B1/en not_active Expired - Lifetime
- 2000-08-29 US US09/651,349 patent/US6349583B1/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109689241A (en) * | 2016-07-11 | 2019-04-26 | 萨帕公司 | The molding roof rail of thermometal gas and its manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| US6349583B1 (en) | 2002-02-26 |
| DE19928873B4 (en) | 2004-08-12 |
| DE19928873A1 (en) | 2001-01-04 |
| EP1063029A1 (en) | 2000-12-27 |
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