EP1628788B1 - Method for producing a peripherally closed hollow profiled element - Google Patents
Method for producing a peripherally closed hollow profiled element Download PDFInfo
- Publication number
- EP1628788B1 EP1628788B1 EP04729065A EP04729065A EP1628788B1 EP 1628788 B1 EP1628788 B1 EP 1628788B1 EP 04729065 A EP04729065 A EP 04729065A EP 04729065 A EP04729065 A EP 04729065A EP 1628788 B1 EP1628788 B1 EP 1628788B1
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- EP
- European Patent Office
- Prior art keywords
- blank
- trimming
- internal high
- hollow profiled
- profiled element
- 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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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000007906 compression Methods 0.000 claims abstract 6
- 238000009966 trimming Methods 0.000 claims description 23
- 238000005094 computer simulation Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims 4
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 description 10
- 238000005520 cutting process Methods 0.000 description 4
- 238000003032 molecular docking Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000002788 crimping Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007373 indentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/053—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure characterised by the material of the blanks
Definitions
- the invention relates to a method for producing a circumferentially closed hollow profile according to the preamble of claim 1.
- a generic method is known from WO 98/43758 A1.
- a hollow profile blank uniform cross-section is inserted into a hydroforming, the engraving has a respect to the blank in the region between the ends reduced cross-section.
- the inserted hollow profile blank is squeezed during the closing operation of the forming tool in this area.
- the resulting indentation of the hollow profile blank manifests itself in a misalignment or deformation of the beginning of the manufacturing process rectilinear and with the end face perpendicular to the longitudinal extension of the blank end of the blank.
- the invention has the object of developing a generic method to the effect that a reliable production of the hollow section is made possible even with strong squish deformations of the hollow profile blank, resulting from the closing of the forming tool.
- the invention is based on the finding that the deformations occurring during squeezing of the blank can be compensated by a targeted cutting of the blank ends.
- the invention avoids a cutting collision of the axial punches and the blank otherwise provided with tilted end faces, wherein the resulting chips and flags would have to be removed in a complex manner during a reworking operation after removal of the finished hollow profile.
- This removal is usually associated with a separation of the sealing portions of the blank ends, so that due to the invention, such a trimming operation can be omitted, which in addition to the labor savings consuming waste material can be saved.
- the Vorabeinplanen a lost additional length of the blank is no longer necessary, which is significantly reduced due to the shorter length of the blank in the subsequent expansion of the blank by means of internal high pressure to be overcome friction between the blank and forming tool.
- the trimming of the ends of the blank takes place in such a way that the end faces of the ends are bevelled to the center axis lying in the crimping direction transversely to the longitudinal axis of the blank.
- This trimming shape results from the additional knowledge that the deformations of the blank resulting from the squeezing as a function of the squeezing direction lead to a misalignment of the pipe end cross-section and thus the end face to said axis, so that the pipe ends are bevelled in the opposite direction in the sense of the invention.
- misalignment of the cross section projects beyond an upper peripheral region of the pipe end in the axial direction of the lower peripheral region.
- the blank ends are trimmed such that their end faces remain arranged parallel to each other.
- the end face of an uncut end is tilted upward, so that the lower peripheral portion axially projects beyond the upper peripheral portion of the end, and the end face of the other uncut end down tilted, wherein in the axial direction of the upper peripheral portion of the end projects beyond the lower peripheral region.
- the blank can therefore before the crushing at both ends under the same Angle in the opposite direction of the tilting be cut.
- the resulting similarity of the trimming thereby represents a reduction in the workload of the cutting process. The same applies, moreover, for a lateral offset of the ends after crushing.
- a particularly preferred embodiment of the invention according to claim 4 is the special determination of the bevel angle of the trim, which is in a range between 6 ° and 10 °, preferably 8 °.
- the tilt of the end faces which is caused by the squeezing deformation, almost always lies in this angular range, so that in the opposite direction an equally large bevel angle of the end face of the end must be provided during trimming.
- the trimming of the ends takes place in two dimensions. Although this is the exact space contour of the blank end not recorded, but such a trimming is particularly procedural economic and fast executable.
- the trimming of the ends takes place in a three-dimensional contour cut. This can be done for example by means of a cutting laser and offers the axially docking Axialstempel the best possible connection surface, so that an optimal seal is achieved by means of the stamp.
- a hydroforming 1 which consists of an upper part 2 and a lower part 3.
- these two ends 6 and 7 of the engraving 4 have approximately the same diameter as the inserted hollow profile blank 5.
- a middle region 8 which connects the two ends 6 and 7, the engraving 4 is considerably narrowed in cross-section ,
- the hollow profile blank 5 in turn has at its two ends 9 and 10 in the direction of the longitudinal axis 11 of the hollow section blank 5 inclined end face 12 and 13, respectively. While an upper peripheral region of the end surface 12 projects beyond its lower peripheral region 15 in the axial direction, a lower peripheral region of the end surface 13 projects beyond its upper peripheral region 17 in the axial direction.
- the hollow profile blank 5, in which the end faces 12 and 13 of its ends 9 and 10 are arranged parallel to each other, is located entirely within the engraving 4 of the forming tool 1.
- the Anschrägungswinkel ⁇ of the end face 12 and 13 to the center vertical axis 18 is 8 °.
- the ends 9 and 10 of the blank 5 are first trimmed so that beveled end faces 12 and 13 result, which should be bevelled as possible to the axis lying in the squish direction, to an optimum deformation result, resulting from the squeezing to and thus to ensure a clean sealing of the later for hydroforming docking axial punches.
- the trimming of the blank ends 9 and 10 takes place such that their end faces 12 and 13 remain parallel to one another.
- the deformation of the ends 9 and 10 caused by the subsequent squeezing operation is determined before the trimming operation in a finite element computer simulation, and then the suitable trimming contour and the suitable chamfer angle ⁇ are calculated therefrom.
- the thus-cut hollow profile blank 5 is now inserted into the engraving 4 of the forming tool 1, after which it is closed. Due to the engraving 4 narrowing middle region 8 takes place in the closing operation of the forming tool 1 by the succession of the upper part
- the central pinch 19, which can be seen from Figure 2, which represents the forming tool 1 in its closed state, has an effect on the ends 9 and 10 of the hollow section blank 5 such that the End faces 12 and 13 of the blank 5 are perpendicular to its longitudinal extent.
- the axial punches are moved up to the ends 9 and 10 of the hollow profile blank 5 and seal it off with a conical sealing area.
- a pressurized fluid is now introduced into the hollow section blank 5 and set under high pressure.
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Herstellung eines umfänglich geschlossenen Hohlprofils gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a method for producing a circumferentially closed hollow profile according to the preamble of
Ein gattungsgemäßes Verfahren ist aus der WO 98/43758 A1 bekannt. Hierbei wird ein Hohlprofilrohling gleichförmigen Querschnitts in ein Innenhochdruckumformwerkzeug eingelegt, dessen Gravur einen bzgl. des Rohlings im Bereich zwischen dessen Enden reduzierten Querschnitt aufweist. Dadurch wird der eingelegte Hohlprofilrohling während des Schließvorganges des Umformwerkzeugs in diesem Bereich gequetscht. Der dadurch bedingte Einzug des Hohlprofilrohlings äußert sich jedoch in einer Schiefstellung bzw. einer Verformung des zu Beginn des Herstellungsverfahrens geradlinig verlaufenden und mit der Stirnfläche senkrecht zur Längserstreckung des Rohlings stehenden Endes des Rohlings. Aufgrund der durch das Quetschen veränderten Endenkontur und der Verkippung der Stirnfläche können die mit einem konischen Dichtbereich versehenen, an den Rohlingsenden anschließend andockenden Axialstempel nur unzureichend gegenüber dem später zu erzeugenden Innenhochdruck den Rohling abdichten. Dies hat zur Folge, dass der später stattfindende Aufweitvorgang des Rohlings mittels des fluidischen Innenhochdrucks nicht völlig prozesssicher ist und damit das Hohlprofil nicht wie gewünscht hergestellt werden kann.A generic method is known from WO 98/43758 A1. Here, a hollow profile blank uniform cross-section is inserted into a hydroforming, the engraving has a respect to the blank in the region between the ends reduced cross-section. As a result, the inserted hollow profile blank is squeezed during the closing operation of the forming tool in this area. However, the resulting indentation of the hollow profile blank manifests itself in a misalignment or deformation of the beginning of the manufacturing process rectilinear and with the end face perpendicular to the longitudinal extension of the blank end of the blank. Due to the changed by crushing the end contour and the tilting of the end face provided with a conical sealing area, then the docking ends then docking axial punches insufficiently against the later to be generated internal high pressure seal the blank. This has the consequence that the subsequent expansion process of the blank by means of the fluidic internal high pressure is not completely reliable process and so that the hollow profile can not be made as desired.
Der Erfindung liegt die Aufgabe zugrunde, ein gattungsgemäßes Verfahren dahingehend weiterzubilden, dass auch bei starken Quetschverformungen des Hohlprofilrohlings, die sich beim Schließen des Umformwerkzeuges ergeben, eine prozesssichere Herstellung des Hohlprofils ermöglicht wird.The invention has the object of developing a generic method to the effect that a reliable production of the hollow section is made possible even with strong squish deformations of the hollow profile blank, resulting from the closing of the forming tool.
Die Aufgabe ist erfindungsgemäß durch die Merkmale des Patentanspruches 1 gelöst.The object is achieved by the features of
Die Erfindung basiert auf der Erkenntnis, dass durch einen gezielten Zuschnitt der Rohlingsenden die beim Quetschen des Rohlings auftretenden Verformungen kompensiert werden können. Durch das erfindungsgemäße Beschneiden der Rohlingsenden wird erreicht, dass nach dem Quetschen und bei völlig geschlossenem Umformwerkzeug die Stirnflächen der Enden eben sind und weitestgehend senkrecht zur Längserstreckung des Rohlings ausgerichtet sind. Infolge der erreichten Stellung der Rohlingsenden können die Axialstempel an diesen Enden andocken, als ob der Rohling unbeschnitten und vorher keiner Quetschung unterzogen worden wäre. Somit können die Axialstempel den Rohling beiderends ausreichend gegenüber dem noch zu erzeugenden Innenhochdruck abdichten, wodurch eine prozesssichere Herstellung des Hohlprofils ermöglicht wird. Zusätzlich wird durch die Erfindung eine spanabhebende Kollision der Axialstempel und des ansonsten mit gekippten Stirnflächen versehenen Rohlings vermieden, wobei die dabei entstehenden Späne und Fähnchen in aufwendiger Weise während eines Nacharbeitsgangs nach Entnahme des fertiggeformten Hohlprofils entfernt werden müssten. Dieses Entfernen ist zumeist verbunden mit einem Abtrennen der Abdichtabschnitte der Rohlingsenden, so dass aufgrund der Erfindung eine derartige Beschnittoperation entfallen kann, wobei neben der Arbeitsersparnis aufwendig zu entsorgender Materialabfall eingespart werden kann. Auch ist das Vorabeinplanen einer verlorenen Zusatzlänge des Rohlings nicht mehr vonnöten, wodurch aufgrund der kürzeren Länge des Rohlings die bei der anschließenden Aufweitung des Rohlings mittels Innenhochdruck zu überwindende Reibung zwischen Rohling und Umformwerkzeug erheblich verringert wird.The invention is based on the finding that the deformations occurring during squeezing of the blank can be compensated by a targeted cutting of the blank ends. By trimming the blank ends according to the invention it is achieved that after crushing and completely closed forming tool, the end faces of the ends are flat and are aligned substantially perpendicular to the longitudinal extent of the blank. Due to the achieved position of the blank ends, the axial punches can dock at these ends as if the blank had been uncut and had not previously been subjected to pinching. Thus, the axial punches the blank at both ends sufficiently sealed against the still to be generated internal high pressure, creating a process-reliable production of the hollow section is made possible. In addition, the invention avoids a cutting collision of the axial punches and the blank otherwise provided with tilted end faces, wherein the resulting chips and flags would have to be removed in a complex manner during a reworking operation after removal of the finished hollow profile. This removal is usually associated with a separation of the sealing portions of the blank ends, so that due to the invention, such a trimming operation can be omitted, which in addition to the labor savings consuming waste material can be saved. Also, the Vorabeinplanen a lost additional length of the blank is no longer necessary, which is significantly reduced due to the shorter length of the blank in the subsequent expansion of the blank by means of internal high pressure to be overcome friction between the blank and forming tool.
In einer bevorzugten Ausführungsform der Erfindung gemäß Anspruch 2 erfolgt der Beschnitt der Enden des Rohlings so, dass die Stirnflächen der Enden zur in Quetschrichtung liegenden quer zur Längsachse des Rohlings verlaufenden Mittenachse angeschrägt werden. Diese Beschnittform resultiert aus der zusätzlichen Erkenntnis, dass die durch das Quetschen in Abhängigkeit von der Quetschrichtung entstehenden Deformationen des Rohlings zu einer Schiefstellung des Rohrendenquerschnitts und damit der Stirnfläche zur besagten Achse führen, so dass die Rohrenden im Sinne der Erfindung in Gegenrichtung angeschrägt werden. Bei der erwähnten Schiefstellung des Querschnittes überragt in axialer Richtung ein oberer Umfangsbereich des Rohrendes dessen unteren Umfangsbereich.In a preferred embodiment of the invention according to
In einer weiteren bevorzugten Weiterbildung der Erfindung nach Anspruch 3 werden die Rohlingsenden derart beschnitten, dass deren Stirnflächen parallel zueinander angeordnet verbleiben. Im Falle, dass nach erfolgter Quetschung die Endbereiche des Hohlprofilrohlings höhenversetzt zueinander zu liegen kommen, ist die Stirnfläche des einen unbeschnittenen Endes nach oben gekippt, so dass der untere Umfangsbereich axial den oberen Umfangsbereich des Endes überragt, und die Stirnfläche des anderen unbeschnittenen Endes nach unten gekippt, wobei in axialer Richtung der obere Umfangsbereich des Endes den unteren Umfangsbereich überragt. Der Rohling kann daher vor dem Quetschvorgang an beiden Enden unter gleichem Winkel in Gegenrichtung der Kippung beschnitten werden. Die daraus herrührende Gleichartigkeit des Beschnittes stellt dabei eine Arbeitserleichterung des Schneidverfahrens dar. Gleiches gilt im übrigen für einen Seitenversatz der Enden nach erfolgter Quetschung.In a further preferred embodiment of the invention according to
Eine besonders bevorzugte Ausführungsform der Erfindung stellt gemäß Anspruch 4 die spezielle Bestimmung des Anschrägungswinkels des Beschnittes dar, der in einem Bereich zwischen 6° und 10°, vorzugsweise 8°, liegt. Hierzu hat sich in Untersuchungen praktischer und theoretischer Art herausgestellt, dass die Verkippung der Stirnflächen, die durch die quetschende Deformation hervorgerufen wird, nahezu immer in diesem Winkelbereich liegt, so dass in Gegenrichtung ein ebenso großer Anschrägungswinkel der Stirnfläche des Endes beim Beschnitt vorgesehen werden muss.A particularly preferred embodiment of the invention according to
Nach einer weiteren bevorzugten Ausführungsform der Erfindung gemäß Anspruch 5 wird vor dem Beschneiden der Enden, die durch den späteren Quetschvorgang real auftretende Endendeformation in einer Computersimulation, insbesondere einer Finite-Elemente-Simulation ermittelt und dann daraus zur Kompensation der Deformation präzise eine optimale Beschneidungskontur und einen optimalen Anschrägungswinkel des zu erfolgenden Beschnitts errechnet. Hierdurch kann mit relativ geringem Aufwand ohne Inanspruchnahme von vielzähligen, mühseligen, empirischen Untersuchungen der für jedes Bauteil und für jede Art der Quetschung geeignete Anschrägungswinkel und Beschneidungskontur individuell ermittelt werden.According to a further preferred embodiment of the invention according to
Nach einer weiteren bevorzugten Ausführungsform der Erfindung erfolgt gemäß Anspruch 6 der Beschnitt der Enden zweidimensional. Dabei wird zwar die exakte Raumkontur des Rohlingsendes nicht erfasst, jedoch ist ein derartiger Beschnitt besonders verfahrensökonomisch und schnell ausführbar.According to another preferred embodiment of the invention according to
In einer besonders bevorzugten Ausführungsform der Erfindung gemäß Anspruch 7 erfolgt der Beschnitt der Enden in einem dreidimensionalen Konturenschnitt. Dies kann beispielsweise mittels eines Schneidlasers erfolgen und bietet den axial andockenden Axialstempel die denkbar beste Anbindungsfläche, so dass eine optimale Abdichtung mittels der Stempel erreicht wird.In a particularly preferred embodiment of the invention according to
Im Folgenden ist die Erfindung anhand eines in den Zeichnungen dargestellten Ausführungsbeispieles näher erläutert. Dabei zeigt:
- Fig. 1
- in einem seitlichen Halbschnitt einen beidseitig erfindungsgemäß beschnittenen Hohlprofilrohling in einem geöffneten Umformwerkzeug,
- Fig. 2
- in einem seitlichen Halbschnitt den Hohlprofilrohling aus
Figur 1 nach erfolgtem Quetschvorgang bei geschlossenem Innenhochdruckumformwerkzeug.
- Fig. 1
- in a lateral half section, a hollow profile blank cut in accordance with the invention on both sides in an opened forming tool,
- Fig. 2
- in a lateral half section of the hollow profile blank of Figure 1 after the crimping process with closed hydroforming.
In Figur 1 ist ein Innenhochdruckumformwerkzeug 1 dargestellt, welches aus einem Oberteil 2 und einem Unterteil 3 besteht. Die Werkzeuggravur 4, die von beiden Werkzeugteilen 2 und 3 gebildet wird und einen Formraum für einen in das Werkzeug 1 eingelegten und umzuformenden Hohlprofilrohling 5 begrenzt, ist derart gestaltet, dass ein Ende 6 der Gravur 4 zum anderen Ende 7 höhenversetzt angeordnet ist. Diese beiden Enden 6 und 7 der Gravur 4 weisen im geschlossenen Umformwerkzeug 1 gemäß Figur 2 in etwa den gleichen Durchmesser auf wie der eingelegte Hohlprofilrohling 5. In einem Mittenbereich 8, der die beiden Enden 6 und 7 miteinander verbindet, ist die Gravur 4 erheblich querschnittsverengt.In Figure 1, a
Der Hohlprofilrohling 5 weist seinerseits an seinen beiden Enden 9 und 10 eine in Richtung der Längsachse 11 des Hohlprofilrohlings 5 geneigte Stirnfläche 12 bzw. 13 auf. Während ein oberer Umfangsbereich der Stirnfläche 12 deren unteren Umfangsbereich 15 in axialer Richtung überragt, überragt ein unterer Umfangsbereich der Stirnfläche 13 deren oberen Umfangsbereich 17 in axialer Richtung. Der Hohlprofilrohling 5, bei dem die Stirnflächen 12 und 13 seiner Enden 9 und 10 parallel zueinander angeordnet sind, befindet sich vollständig innerhalb der Gravur 4 des Umformwerkzeuges 1. Der Anschrägungswinkel α der Stirnfläche 12 bzw. 13 zur Mittenhochachse 18 beträgt 8°.The hollow profile blank 5 in turn has at its two
Zur Herstellung des Hohlprofils werden zuerst die Enden 9 und 10 des Rohlings 5 so beschnitten, dass sich angeschrägte Stirnflächen 12 und 13 ergeben, wobei diese möglichst zur in Quetschrichtung liegenden Achse angeschrägt sein sollen, um ein optimales Deformationsergebnis, das aus dem Quetschvorgang hervorgeht, zu erhalten und um damit ein sauberes Abdichten der später zur Innenhochdruckumformung andockenden Axialstempel zu sichern. In diesem Ausführungsbeispiel erfolgt der Beschnitt der Rohlingsenden 9 und 10 derart, dass deren Stirnflächen 12 und 13 parallel zueinander verbleiben. Um den gewünschten Beschnitt zu ermöglichen, wird vor dem Beschneidungsvorgang die durch den späteren Quetschvorgang hervorgerufene Deformation der Enden 9 und 10 in einer Finite-Elemente-Computersimulation ermittelt und dann daraus die geeignete Beschneidungskontur und der geeignete Anschrägungswinkel α errechnet. Der so beschnittene Hohlprofilrohling 5 wird nun in die Gravur 4 des Umformwerkzeuges 1 eingelegt, wonach dieses geschlossen wird. Aufgrund des die Gravur 4 verengenden Mittenbereichs 8 erfolgt im Schließvorgang des Umformwerkzeuges 1 durch das Aufeinanderzufahren des Oberteils 2 und des Unterteils 3 eine Quetschung des Hohlprofilrohlings 5. Die mittige Quetschung 19, die aus Figur 2 zu erkennen ist, welche das Umformwerkzeug 1 in seinem geschlossenen Zustand darstellt, wirkt sich auf die Enden 9 und 10 des Hohlprofilrohlings 5 derart aus, dass die Stirnflächen 12 und 13 des Rohlings 5 senkrecht zu seiner Längserstreckung stehen. Alsdann werden die Axialstempel an die Enden 9 und 10 des Hohlprofilrohlings 5 herangefahren und dichten diesen mit einem konischen Dichtbereich ab. Über die Axialstempel wird nun in den Hohlprofilrohling 5 ein Druckfluid eingeleitet und unter Hochdruck gesetzt. Aufgrund des bestehenden Innenhochdruckes wird der Hohlprofilrohling 5 aufgeweitet, wobei er sich vollständig an der Gravur 4 des Umformwerkzeuges 1 anlegt. Das Druckfluid wird nun entspannt und aus dem nun fertiggeformten Hohlprofil herausgeleitet, wonach die Axialstempel von dem Umformwerkzeug 1 zurückgefahren werden. Schließlich wird dieses geöffnet und das Hohlprofil aus der Gravur 4 entnommen.To produce the hollow profile, the
Im Übrigen sei an dieser Stelle betont, dass während der Innenhochdruckumformung mittels der Axialstempel Rohlingsmaterial axial nachgeschoben werden kann. Die Erfindung bringt hierfür den bedeutenden Vorteil, dass durch die Geradestellung der Stirnflächen 12,13 eine homogene Krafteinleitung der Axialstempel in den auszubauchenden Umformbereich des Innenhochdruckumformprozesses ermöglicht wird, was infolge der darauf beruhenden Vermeidung von unerwünschten Faltenbildungen und Materialverdickungen außerordentlich zur Prozesssicherheit des Umformprozesses beiträgt.Incidentally, it should be emphasized at this point that blank material can be axially displaced during hydroforming by means of the axial punch. The invention provides this the significant advantage that the straight position of the end faces 12,13 a homogeneous application of force Axialstempel is made possible in the bulging deformation of the Innenhochdruckumformprozesses, which greatly contributes to the process reliability of the forming process due to the based thereon avoidance of unwanted wrinkles and thickening material.
Claims (7)
- A method for producing a peripherally closed hollow profiled element by means of internal high-pressure forming, a hollow elongated blank being inserted into an internal high-pressure forming tool, the blank located completely inside the forming tool after the insertion being compressed in a region lying between its ends during the closing operation of the forming tool, after which the compressed blank is expanded into the final shape of the hollow profiled element by means of fluidic internal high pressure, characterized in that the ends (9, 10) of the blank (5) are trimmed before the compression operation, with a respective beveled front face (12, 13) being formed, and in that the trimming contour of the ends (9, 10) and the beveling angle (α) are selected in such a way that the ends (9, 10) are deformed by means of the compression operation in such a way that their front faces (12, 13) have an essentially plane form and assume a position which is as perpendicular as possible to the longitudinal extent of the blank (5).
- The method as claimed in claim 1, characterized in that the trimming is effected in such a way that the front faces (12, 13) of the ends (9, 10) are beveled relative to the center axis (18) lying in the compression direction and running transversely to the longitudinal axis (11) of the blank (5).
- The method as claimed in either of claims 1 and 2, characterized in that the blank ends (9, 10) are trimmed in such a way that their front faces (12, 13) remain arranged parallel to one another.
- The method as claimed in one of claims 1 to 3, characterized in that the beveling angle (α) lies within a range of between 6° and 10°, preferably 8°.
- The method as claimed in one of claims 1 to 4, characterized in that the end deformation occurring due to the subsequent compression operation is determined by a computer simulation before the trimming of the ends (9, 10) and then a trimming contour and a beveling angle (α) of the trimming to be effected is calculated therefrom for compensating for the deformation.
- The method as claimed in one of claims 1 to 5, characterized in that the trimming of the ends (9, 10) is effected two-dimensionally.
- The method as claimed in one of claims 1 to 5, characterized in that the trimming of the ends (9, 10) is effected by a three-dimensional contour cut.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10323738A DE10323738B3 (en) | 2003-05-24 | 2003-05-24 | Manufacturing closed hollow profile involves cutting semi-finished product ends to form angled ends before squeezing; contour, angle are selected so ends form essentially flat shape after squeezing |
| PCT/EP2004/004301 WO2004103602A1 (en) | 2003-05-24 | 2004-04-23 | Method for producing a peripherally closed hollow profiled element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1628788A1 EP1628788A1 (en) | 2006-03-01 |
| EP1628788B1 true EP1628788B1 (en) | 2007-05-30 |
Family
ID=33305223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04729065A Expired - Lifetime EP1628788B1 (en) | 2003-05-24 | 2004-04-23 | Method for producing a peripherally closed hollow profiled element |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20060248933A1 (en) |
| EP (1) | EP1628788B1 (en) |
| JP (1) | JP2006528075A (en) |
| CA (1) | CA2526774A1 (en) |
| DE (3) | DE10323738B3 (en) |
| WO (1) | WO2004103602A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201114521A (en) * | 2009-10-29 | 2011-05-01 | Metal Ind Res & Dev Ct | Method of forming and manufacturing U-shaped metal tube support frame |
| CN114653806B (en) * | 2022-03-01 | 2023-12-22 | 哈尔滨工业大学（威海） | Preforming method for high-strength steel reducing tubular part |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE645954A (en) * | 1963-03-28 | |||
| USRE33990E (en) * | 1987-05-06 | 1992-07-14 | Ti Corporate Services Limited | Method of forming box-like frame members |
| DE4320237C1 (en) * | 1993-06-18 | 1994-08-18 | Schaefer Maschbau Wilhelm | Method and device for producing a hollow item according to the internal high-pressure process |
| US5644829A (en) * | 1993-08-16 | 1997-07-08 | T I Corporate Services Limited | Method for expansion forming of tubing |
| JP3509217B2 (en) * | 1994-09-20 | 2004-03-22 | 株式会社日立製作所 | Forming method and forming apparatus for deformed cross-section pipe |
| US5557961A (en) * | 1995-11-13 | 1996-09-24 | General Motors Corporation | Hydroformed structural member with varied wall thickness |
| AU2170297A (en) * | 1997-03-27 | 1998-10-22 | Ti Corporate Services Limited | Method and apparatus for forming of tubing |
| GB2340779B (en) * | 1997-05-12 | 2001-03-14 | Dana Corp | Method of hydroforming a vehicle frame component |
| NZ502233A (en) * | 1997-07-18 | 2001-05-25 | Cosma Int Inc | Hydroforming of a tubular blank having an oval cross section and hydroforming apparatus |
| DE19813012C2 (en) * | 1998-03-25 | 2002-08-01 | Daimler Chrysler Ag | Process for producing a hollow body from a tubular blank by hydroforming |
| US6065502A (en) * | 1998-10-07 | 2000-05-23 | Cosma International Inc. | Method and apparatus for wrinkle-free hydroforming of angled tubular parts |
| JP3854812B2 (en) * | 2001-03-27 | 2006-12-06 | 新日本製鐵株式会社 | Strength members for automobiles |
| CN1222378C (en) * | 2001-05-22 | 2005-10-12 | 三菱自动车工业株式会社 | Hydroforming method and product made by method |
-
2003
- 2003-05-24 DE DE10323738A patent/DE10323738B3/en not_active Expired - Fee Related
-
2004
- 2004-04-23 DE DE112004000725T patent/DE112004000725D2/en not_active Expired - Fee Related
- 2004-04-23 US US10/559,165 patent/US20060248933A1/en not_active Abandoned
- 2004-04-23 EP EP04729065A patent/EP1628788B1/en not_active Expired - Lifetime
- 2004-04-23 DE DE502004003973T patent/DE502004003973D1/en not_active Expired - Lifetime
- 2004-04-23 WO PCT/EP2004/004301 patent/WO2004103602A1/en active IP Right Grant
- 2004-04-23 JP JP2006529701A patent/JP2006528075A/en not_active Withdrawn
- 2004-04-23 CA CA002526774A patent/CA2526774A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| EP1628788A1 (en) | 2006-03-01 |
| JP2006528075A (en) | 2006-12-14 |
| DE112004000725D2 (en) | 2006-10-19 |
| US20060248933A1 (en) | 2006-11-09 |
| CA2526774A1 (en) | 2004-12-02 |
| DE502004003973D1 (en) | 2007-07-12 |
| DE10323738B3 (en) | 2004-11-18 |
| WO2004103602A1 (en) | 2004-12-02 |
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