EP0941780B1 - Method and device for producing a hollow body with bulges at a distance from oneanother - Google Patents
Method and device for producing a hollow body with bulges at a distance from oneanother Download PDFInfo
- Publication number
- EP0941780B1 EP0941780B1 EP99104527A EP99104527A EP0941780B1 EP 0941780 B1 EP0941780 B1 EP 0941780B1 EP 99104527 A EP99104527 A EP 99104527A EP 99104527 A EP99104527 A EP 99104527A EP 0941780 B1 EP0941780 B1 EP 0941780B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hollow body
- hollow member
- bulges
- sealing
- bulge
- 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
Links
- 238000000034 method Methods 0.000 title claims description 25
- 238000007789 sealing Methods 0.000 claims description 45
- 238000004519 manufacturing process Methods 0.000 claims description 19
- 238000000465 moulding Methods 0.000 claims description 7
- 238000005452 bending Methods 0.000 description 4
- 239000011324 bead Substances 0.000 description 3
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 230000007704 transition Effects 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
- B21D26/045—Closing or sealing means
-
- 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
-
- 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 manufacturing of a tubular hollow body with spaced apart Bulges using internal high pressure deformation.
- tubular hollow bodies by means of internal high pressure deformation to reshape.
- EP 0 439 764 B1 describes a process for the production of hollow one-piece metallic workpieces. With this A tubular hollow body is used as the starting form under the pressure of a liquid while at the same time axial feed movement expanded and to the shape of a split mold.
- the length of the hollow body to be formed is limited because the free buckling length with the length of the Hollow body increases and the axial feeding without additional Increasing the internal pressure to form wrinkles on would lead hollow body. It also increases with the increase of the internal pressure the locking force required for longer lengths very strong. This in turn leads to an increase the manufacturing cost.
- the known method comes across to its limits, especially if more than two Bulges can be manufactured in one step should.
- DE 196 22 371 A1 discloses one method and one Device for the production of camshafts, in which through the cams from a hollow semi-finished product High pressure can be formed. In doing so, a Sealed inner portion of the hollow body at one end and supported at the other end. Under axial Pushing on this inner section Bulge manufactured under high hydraulic pressure. The number of bulges is due to the contour of the Mold given.
- US-A-4,788,843 also discloses a method and an Device for the hydraulic forming of a tubular Hollow body emerges, with more than two bulges be generated on a hollow body in one operation can.
- the hollow body is placed in a mold inserted, fixed at the ends by mandrels and sealed.
- the hollow body is over the end mandrels then filled with a fluid. After that Press plunger pushed through the mandrels into the hollow body, which builds up the necessary hydraulic internal pressure and the bulges are created. In this way U-shaped hollow bodies can also be machined.
- the invention is therefore based on the prior art according to DE-A-19622372 based on the task of producing tubular Hollow bodies with several bulges arranged at a distance using the internal high pressure deformation at Procedural avoidance of inadmissible wall thinning to improve.
- the main idea is the measure, the bulges on To produce hollow parts in sections. To do this first an inner portion of the hollow body at one end sealed and internally supported at the other end. Then a bulge is created on this inner section by means of hydraulic internal high pressure under axial Pushing the hollow body generated. The production further bulges on the hollow body take place in the same Way after each axial implementation of the hollow body in Molding tool.
- the shape and geometry of the bulges can be tailored to the requirements by selecting appropriate matrices in the Forming tool can be determined.
- Bulges can both radial on one side on the hollow body or circumferentially annular be generated.
- the bulges can also be with each other be circumferentially offset.
- the invention The method is therefore particularly suitable for Manufacture of e.g. hollow camshafts on this Can be manufactured rationally and economically.
- the process comes with a two-part mold, a sealing mandrel that can be attached to a hollow body at the end as well as a sealing and insertable into the hollow body Support tool for use.
- the sealing and Support tool has a sealing head and a support body on, each in their axial position in the hollow body are positionable.
- the sealing head is movable and media-tight on the inner surface of the hollow body Plant can be brought. He is guided by a guide rod that penetrates the support body with radial play in the intended position brought.
- the correct positioning of the support body and the Sealing heads allow flexible adjustment in terms of the length of the tubular hollow body and in terms of the length of the inner section because of its length varies with the axial extension of the bulges.
- the hollow body is advantageous between production bent two bulges. This enables repeated Hydroforming and bending the manufacture of multiple curved and bulged hollow bodies almost any Length.
- the hydraulic internal pressure is supported Applied end of the hollow body forth.
- one or more Bulges can be opened at the front. This can in various ways, preferably shear cutting technology, for example, by punching. By the Openings of the bulges become necklines on the hollow body educated.
- the Sealing head made of two plates that can be moved against each other with an intermediate sealing insert. By the Pressing the two plates together forms the sealing insert a circumferential sealing bead that acts as a sealing ring and seals the hollow body in a media-tight manner.
- Figures 1 to 8 is a tubular Hollow bodies in various stages of manufacture. Figures 1 to 8 are technically simplified and not to understand to scale.
- Figure 1 shows the tubular hollow body 1 in its Starting position.
- a length section 2 of the tubular Hollow body 1 is received by a mold 3, which consists of an upper die 4 and a lower die 5.
- the dies 4, 5 is a contour 6, 7 for hydraulic forming of the tubular hollow body 1 incorporated.
- the molding tool 3 is in the length range 8 provided with a radial expansion 9.
- the on this widening 9 adjoining contour sections 10, 11 support the length section enclosed by the molding tool 3 2 of the tubular hollow body 1 on the outside.
- the molding tool 3 is at the end of the length section 2 open and has a radial widening 12 on the mouth side with a conical transition 13.
- sealing and support tool 14 In the length section 2 of the hollow body 1 is a sealing and support tool 14 introduced.
- the sealing and support tool 14 comprises a sealing head 15, a support body 16 and a guide rod 17.
- sealing head 15 and support body 16 are each in their axial position in the hollow body 1 positionable. For positioning is the Sealing head 15 with the support body 16 with a radial Game enforcing guide rod 17 connected.
- An inner section 18 located in the length region 8 is with the help of the sealing and support tool 14 on one End 19 sealed by the sealing head 15 and the other End 20 supported by the support body 16.
- the sealing head 15 comprises two displaceable against each other Plates 21, 21 'with an interposed sealing insert 22 (see also Figure 9).
- the sealing insert 22 forms one on the radial Outside 23 of the sealing head 15 circumferential sealing bead 24, which is on the inner surface 25 of the hollow body 1 creates and the sealing head 15 jammed.
- the axial length L of the sealing head 15 is not larger than two thirds the length L1 of the contour section 11 of the molding tool 3rd
- a piston-like sealing mandrel 26 the length section 2 of the tubular hollow body 1 from the end media-tight. Via an axial channel guided through the sealing mandrel 26 27 becomes a hydraulic high internal pressure in the sealing head 15 and sealing mandrel 26 sealed length section 28, which also includes the inner portion 18.
- Figure 2 shows the representation in vertical longitudinal section of Figure 1 during the forming process of the tubular Hollow body 1.
- the sealing mandrel 26 pushes the tubular hollow body 1 axially in the direction of the inner portion 18, the simultaneously applied hydraulic Internal high pressure to form a bulge 29 am Hollow body 1a leads.
- the support body 16 prevents Buckling of the hollow body 1a during the pushing. By pushing in, impermissible material thinning becomes avoided in the region of the bulge 29.
- the next manufacturing step according to Figure 3 shows how the reshaped hollow body 1a axially in the image plane to the right is implemented and the sealing mandrel 26 with the sealing head 15 a new length section 28a and the sealing head 15 with the support body 17 delimits an inner portion 18a.
- Figure 4 shows how in the further production sequence second bulge 30 on the tubular hollow body 1b is attached.
- the forming process is identical to that to figure 2.
- FIG. 5 shows the hollow body 1c, which follows a bending deformation from the hollow body 1b from FIG. 4 emerged.
- the still undeformed end section 31 of the hollow body 1c is, as shown in Figure 6, introduced into the mold.
- Figure 7 shows the forming according to Figure 2, one further bulge 32 is generated.
- the hollow body 1d is in accordance with the manufacturing steps in Figure 3 and Figure 4 axially implemented and it will be a last A bulge 33 is produced.
- Figure 8 shows the tubular longitudinal section Hollow body 1e, as shown in the figures 1 to 7 Manufacturing steps has emerged in Final state after the internal high pressure deformation.
- the curved one and provided with bulges 29, 30, 32, 33 Hollow body 1e can then undergo further treatment that may be required be fed.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Description
Die Erfindung betrifft ein Verfahren zur Herstellung eines rohrförmigen Hohlkörpers mit im Abstand angeordneten Ausbauchungen unter Einsatz der Innenhochdruckverformung.The invention relates to a method for manufacturing of a tubular hollow body with spaced apart Bulges using internal high pressure deformation.
Es ist bekannt, rohrförmige Hohlkörper mittels der Innenhochdruckverformung umzuformen. Beispielsweise beschreibt die EP 0 439 764 B1 ein Verfahren zur Herstellung von hohlen einteiligen metallischen Werkstücken. Bei diesem Verfahren wird ein rohrförmiger Hohlkörper als Ausgangsform unter dem Druck einer Flüssigkeit bei gleichzeitiger axialer Vorschubbewegung aufgeweitet und an die Form eines geteilten Formwerkzeugs gepreßt.It is known to tubular hollow bodies by means of internal high pressure deformation to reshape. For example, describes EP 0 439 764 B1 describes a process for the production of hollow one-piece metallic workpieces. With this A tubular hollow body is used as the starting form under the pressure of a liquid while at the same time axial feed movement expanded and to the shape of a split mold.
Die Länge der umzuformenden Hohlkörper ist dabei begrenzt, da die freie Ausknicklänge mit der Länge des Hohlkörpers zunimmt und das axiale Nachschieben ohne zusätzliche Erhöhung des Innendrucks zu Faltenbildung am Hohlkörper führen würde. Außerdem steigt mit der Erhöhung des Innendrucks die bei größeren Längen notwendige Zuhaltekraft sehr stark an. Dies führt wiederum zu einem Anstieg der Fertigungskosten. Das bekannte Verfahren stößt damit an seine Grenzen, insbesondere wenn mehr als zwei Ausbauchungen in einem Arbeitsschritt gefertigt werden sollen.The length of the hollow body to be formed is limited because the free buckling length with the length of the Hollow body increases and the axial feeding without additional Increasing the internal pressure to form wrinkles on Would lead hollow body. It also increases with the increase of the internal pressure the locking force required for longer lengths very strong. This in turn leads to an increase the manufacturing cost. The known method comes across to its limits, especially if more than two Bulges can be manufactured in one step should.
Die DE 196 22 371 A1 offenbart ein Verfahren und eine Vorrichtung zur Herstellung von Nockenwellen, bei welchem die Nocken aus einem hohlkörperförmigen Halbzeug durch Innenhochdruck ausgeformt werden. Dabei wird ein Innenabschnitt des Hohlkörpers an einem Ende abgedichtet und am anderen Ende abgestützt. Unter axialem Nachschieben wird an diesem Innenabschnitt eine Ausbauchung unter hydraulischem Innenhochdruck gefertigt. Die Anzahl der Ausbauchungen ist durch die Kontur des Formwerkzeugs vorgegeben.DE 196 22 371 A1 discloses one method and one Device for the production of camshafts, in which through the cams from a hollow semi-finished product High pressure can be formed. In doing so, a Sealed inner portion of the hollow body at one end and supported at the other end. Under axial Pushing on this inner section Bulge manufactured under high hydraulic pressure. The number of bulges is due to the contour of the Mold given.
Aus der US-A-4,788,843 geht ferner ein Verfahren und eine Vorrichtung zur hydraulischen Umformung eines rohrförmigen Hohlkörpers hervor, wobei mehr als zwei Ausbauchungen an einem Hohlkörper in einem Arbeitsgang erzeugt werden können. Hierzu wird der Hohlkörper in ein Formwerkzeug eingelegt, endseitig durch Dorne lagefixiert und abgedichtet. Über die endseitigen Dorne wird der Hohlkörper anschließend mit einem Fluid befüllt. Danach werden Presskolben durch die Dorne in den Hohlkörper geschoben, wodurch der notwendige hydraulische Innendruck aufgebaut und die Ausbauchungen erzeugt werden. Auf diese Weise können auch U-förmige Hohlkörper bearbeitet werden.US-A-4,788,843 also discloses a method and an Device for the hydraulic forming of a tubular Hollow body emerges, with more than two bulges be generated on a hollow body in one operation can. For this purpose, the hollow body is placed in a mold inserted, fixed at the ends by mandrels and sealed. The hollow body is over the end mandrels then filled with a fluid. After that Press plunger pushed through the mandrels into the hollow body, which builds up the necessary hydraulic internal pressure and the bulges are created. In this way U-shaped hollow bodies can also be machined.
Unabhängig davon, ob der Hohlkörper gerade oder gebogen ist, weist dieses Verfahren jedoch den Nachteil auf, dass es in den Bereichen der radialen Aufweitungen zwangsläufig zu einer Abnahme der Wandstärke kommt. Damit kann dieses Verfahren nur zur Herstellung solcher Erzeugnisse angewendet werden, bei denen die Anforderungen an die Maßhaltigkeit und Festigkeit im Umformbereich eine untergeordnete Rolle spielen. Schließlich ist auch bei dieser Vorgehensweise die Länge des verarbeitbaren Hohlkörpers begrenzt.Regardless of whether the hollow body is straight or curved However, this method has the disadvantage that it inevitably in the areas of radial expansion there is a decrease in wall thickness. So that can this process only for the manufacture of such products be applied where the requirements for the Dimensional stability and strength in the forming area a subordinate Role-play. After all, this too Procedure the length of the processable hollow body limited.
Der Erfindung liegt daher ausgehend vom Stand der Technik nach DE-A-19622372 die Aufgabe zugrunde, die Herstellung von rohrförmigen Hohlkörpern mit mehreren im Abstand angeordneten Ausbauchungen unter Einsatz der Innenhochdruckverformung bei Vermeidung unzulässiger Wandverdünnungen verfahrensmäßig zu verbessern.The invention is therefore based on the prior art according to DE-A-19622372 based on the task of producing tubular Hollow bodies with several bulges arranged at a distance using the internal high pressure deformation at Procedural avoidance of inadmissible wall thinning to improve.
Die Lösung dieser Aufgabe besteht nach der Erfindung in
den Merkmalen des Anspruchs 1.According to the invention, this object is achieved in
the features of
Kerngedanke bildet die Maßnahme, die Ausbauchungen am Hohlkörper abschnittsweise herzustellen. Hierzu wird zunächst ein Innenabschnitt des Hohlkörpers an einem Ende abgedichtet und am anderen Ende innenseitig abgestützt. Anschließend wird an diesem Innenabschnitt eine Ausbauchung mittels hydraulischem Innenhochdruck unter axialem Nachschieben des Hohlkörpers erzeugt. Die Herstellung weiterer Ausbauchungen am Hohlkörper erfolgt in gleicher Weise nach jeweiligem axialen Umsetzen des Hohlkörpers im Formwerkzeug.The main idea is the measure, the bulges on To produce hollow parts in sections. To do this first an inner portion of the hollow body at one end sealed and internally supported at the other end. Then a bulge is created on this inner section by means of hydraulic internal high pressure under axial Pushing the hollow body generated. The production further bulges on the hollow body take place in the same Way after each axial implementation of the hollow body in Molding tool.
Auf diese Weise lassen sich in Längsrichtung eines praktisch beliebig langen Hohlkörpers mehrere Ausbauchungen herstellen. Durch das abschnittsweise Vorgehen bei der Herstellung der Ausbauchungen wird ein Ausknicken des Hohlkörpers unmöglich. Das bei jedem Ausbauchvorgang vorgenommene axiale Nachschieben vermeidet eine unzulässige Verdünnung der Wandstärke des Hohlkörpers. Durch die innenseitige Abstützung wird eine Faltenbildung des unter axialem Druck stehenden Abschnitts des Hohlkörpers unterdrückt. Der zur Umformung notwendige hydraulische Druck kann reduziert werden. Dies führt zu einer Verminderung der erforderlichen Zuhaltekräfte im Formwerkzeug, was sich vorteilhaft auf die Herstellungskosten auswirkt. Auch der Werkzeugverschleiß wird gesenkt.In this way, one can be practical in the longitudinal direction any length of hollow body several bulges produce. The section by section approach at Manufacturing the bulges is a buckling of the Hollow body impossible. The one carried out with every bulging process axial pushing avoids an impermissible Thinning of the wall thickness of the hollow body. Through the inside Support is a wrinkling of the under suppressed axial section of the hollow body. The hydraulic pressure required for forming can be reduced. This leads to a decrease the required locking forces in the mold, what has a beneficial effect on manufacturing costs. Tool wear is also reduced.
Die Form und Geometrie der Ausbauchungen kann anforderungsgerecht durch die Auswahl entsprechender Matrizen im Formwerkzeug bestimmt werden. Ausbauchungen können sowohl einseitig radial am Hohlkörper oder umlaufend ringförmig erzeugt werden. Die Ausbauchungen können auch untereinander umfangsseitig versetzt angeordnet sein. Das erfindungsgemäße Verfahren eignet sich somit besonders gut zur Herstellung von z.B. hohlen Nockenwellen, die auf diese Weise rationell und ökonomisch gefertigt werden können.The shape and geometry of the bulges can be tailored to the requirements by selecting appropriate matrices in the Forming tool can be determined. Bulges can both radial on one side on the hollow body or circumferentially annular be generated. The bulges can also be with each other be circumferentially offset. The invention The method is therefore particularly suitable for Manufacture of e.g. hollow camshafts on this Can be manufactured rationally and economically.
Bei dem Verfahren kommt ein zweiteiliges Formwerkzeug, einen stirnseitig an einen Hohlkörper ansetzbaren Abdichtdorn sowie ein in den Hohlkörper einführbares Dichtund Stützwerkzeug zum Einsatz. Das Dicht- und Stützwerkzeug weist einen Dichtkopf und einen Stützkörper auf, die jeweils in ihrer axialen Position im Hohlkörper positionierbar sind. Der Dichtkopf ist verlagerbar und mediendicht an der inneren Oberfläche des Hohlkörpers zur Anlage bringbar. Er wird durch eine Führungsstange, die den Stützkörper mit radialem Spiel durchsetzt, in die vorgesehene Position gebracht.The process comes with a two-part mold, a sealing mandrel that can be attached to a hollow body at the end as well as a sealing and insertable into the hollow body Support tool for use. The sealing and Support tool has a sealing head and a support body on, each in their axial position in the hollow body are positionable. The sealing head is movable and media-tight on the inner surface of the hollow body Plant can be brought. He is guided by a guide rod that penetrates the support body with radial play in the intended position brought.
Die lagegerechte Positionierung des Stützkörpers und des Dichtkopfs ermöglichen eine flexible Anpassung hinsichtlich der Länge des rohrförmigen Hohlkörpers sowie hinsichtlich der Länge des Innenabschnitts, da dessen Länge mit der axialen Erstreckung der Ausbauchungen variiert. The correct positioning of the support body and the Sealing heads allow flexible adjustment in terms of the length of the tubular hollow body and in terms of the length of the inner section because of its length varies with the axial extension of the bulges.
Vorteilhaft wird der Hohlkörper zwischen der Herstellung zweier Ausbauchungen gebogen. Das ermöglicht bei wiederholtem Hydroumformen und Biegen die Herstellung von mehrfach gebogenen und ausgebauchten Hohlkörpern nahezu beliebiger Länge.The hollow body is advantageous between production bent two bulges. This enables repeated Hydroforming and bending the manufacture of multiple curved and bulged hollow bodies almost any Length.
Nach Anspruch 2 wird der hydraulische Innendruck vom abgestützten
Ende des Hohlkörpers her aufgebracht. Diese
Maßnahme führt nicht nur zu einer Verfahrensrationalisierung,
sondern verbessert auch die Gestaltungsfreiheit bei
der Herstellung der Hohlkörper hinsichtlich der Länge der
Hohlkörper oder möglicher Biegeoperationen am Hohlkörper.According to
Gemäß den Maßnahmen des Anspruchs 3 können eine oder mehrere
Ausbauchungen stirnseitig geöffnet werden. Dies kann
auf unterschiedlichste Weise, vorzugsweise Scherschneidtechnik,
beispielsweise durch Stanzen erfolgen. Durch das
Öffnen der Ausbauchungen werden Aushalsungen am Hohlkörper
gebildet.According to the measures of
Im Rahmen der Ausführungsform nach Anspruch 4 besteht der
Dichtkopf aus zwei gegeneinander verlagerbaren Platten
mit einer zwischengegliederten Dichteinlage. Durch das
Zusammenpressen der beiden Platten formt die Dichteinlage
einen umlaufenden Dichtwulst, der als Dichtring fungiert
und den Hohlkörper mediendicht verschließt.Within the scope of the embodiment according to
Die Erfindung ist nachfolgend anhand von schematischen Zeichnungen näher erläutert. Es zeigen:
Figur 1- im vertikalen Längsschnitt eine Vorrichtung mit einem Abschnitt eines rohrförmigen Hohlkörpers vor dem Umformvorgang;
Figur 2- die Darstellung der
Figur 1 während des Umformvorgangs; Figur 3- im vertikalen Längsschnitt Vorrichtung und Hohlkörper vor der Herstellung einer zweiten Ausbauchung;
Figur 4- die Darstellung der
Figur 3 während des Umformvorgangs; Figur 5- im vertikalen Längsschnitt den Hohlkörper nach einem Biegevorgang;
Figur 6- im vertikalen Längsschnitt den Hohlkörper und die Vorrichtung vor einem weiteren Umformvorgang;
Figur 7- die Darstellung der
Figur 6 während des Umformvorgangs; Figur 8- im vertikalen Längsschnitt den ausgebauchten und gebogenen Hohlkörper im Endzustand und
Figur 9- im Teillängsschnitt einen Dichtkopf.
- Figure 1
- in vertical longitudinal section a device with a section of a tubular hollow body before the forming process;
- Figure 2
- the representation of Figure 1 during the forming process;
- Figure 3
- in vertical longitudinal section device and hollow body before the production of a second bulge;
- Figure 4
- the representation of Figure 3 during the forming process;
- Figure 5
- in the vertical longitudinal section the hollow body after a bending process;
- Figure 6
- in vertical longitudinal section the hollow body and the device before a further forming process;
- Figure 7
- the representation of Figure 6 during the forming process;
- Figure 8
- in the vertical longitudinal section the bulged and curved hollow body in the final state and
- Figure 9
- a sealing head in the partial longitudinal section.
Mit 1, 1a-1e ist in den Figuren 1 bis 8 ein rohrförmiger Hohlkörper in verschiedenen Fertigungsstufen bezeichnet. Die Figuren 1 bis 8 sind technisch vereinfacht und nicht maßstäblich zu verstehen.With 1, 1a-1e in Figures 1 to 8 is a tubular Hollow bodies in various stages of manufacture. Figures 1 to 8 are technically simplified and not to understand to scale.
Figur 1 zeigt den rohrförmigen Hohlkörper 1 in seiner
Ausgangsposition. Ein Längenabschnitt 2 des rohrförmigen
Hohlkörpers 1 ist von einem Formwerkzeug 3 aufgenommen,
das aus einem Obergesenk 4 und einem Untergesenk 5 besteht.
In die Gesenke 4, 5 ist eine Kontur 6, 7 zur
hydraulischen Umformung des rohrförmigen Hohlkörpers 1
eingearbeitet. Dazu ist das Formwerkzeug 3 im Längenbereich
8 mit einer radialen Aufweitung 9 versehen. Die an
diese Aufweitung 9 angrenzenden Konturabschnitte 10, 11
stützen den vom Formwerkzeug 3 umschlossenen Längenabschnitt
2 des rohrförmigen Hohlkörpers 1 außenseitig ab.
Endseitig des Längenabschnitts 2 ist das Formwerkzeug 3
offen und weist mündungsseitig eine radiale Aufweitung 12
mit einem konusförmigen Übergang 13 auf.Figure 1 shows the tubular
In den Längenabschnitt 2 des Hohlkörpers 1 ist ein Dicht-
und Stützwerkzeug 14 eingebracht. Das Dicht- und Stützwerkzeug
14 umfaßt einen Dichtkopf 15, einen Stützkörper
16 sowie eine Führungsstange 17. Dichtkopf 15 und Stützkörper
16 sind jeweils in ihrer axialen Position im Hohlkörper
1 positionierbar. Zur Positionierung ist der
Dichtkopf 15 mit der den Stützkörper 16 mit radialem
Spiel durchsetzenden Führungsstange 17 verbunden.In the
Ein im Längenbereich 8 befindlicher Innenabschnitt 18
wird mit Hilfe des Dicht- und Stützwerkzeugs 14 an einem
Ende 19 durch den Dichtkopf 15 abgedichtet und am anderen
Ende 20 vom Stützkörper 16 abgestützt.An
Der Dichtkopf 15 umfaßt zwei gegeneinander verlagerbare
Platten 21, 21' mit einer zwischengegliederten Dichteinlage
22 (siehe hierzu auch Figur 9). Durch eine Verlagerung
der Platten 21, 21' in axialer Richtung gegeneinander
formt die Dichteinlage 22 einen an der radialen
Außenseite 23 des Dichtkopfs 15 umlaufenden Dichtwulst
24, der sich an der inneren Oberfläche 25 des Hohlkörpers
1 anlegt und den Dichtkopf 15 verklemmt. Die axiale Länge
L des Dichtkopfs 15 ist dabei nicht größer als zwei Drittel
der Länge L1 des Konturabschnitts 11 des Formwerkzeugs
3. The sealing
Zur Herstellung einer Ausbauchung am Hohlkörper 1 dichtet
ein kolbenartiger Abdichtdorn 26 den Längenabschnitt 2
des rohrförmigen Hohlkörpers 1 endseitig mediendicht ab.
Über einen durch den Abdichtdorn 26 geführten Axialkanal
27 wird ein hydraulischer Innenhochdruck im vom Dichtkopf
15 und Abdichtdorn 26 abgedichteten Längenabschnitt 28,
der auch den Innenabschnitt 18 umfaßt, aufgebaut.Seals to produce a bulge on the hollow body 1
a piston-
Figur 2 zeigt im vertikalen Längsschnitt die Darstellung
der Figur 1 während des Umformvorgangs des rohrförmigen
Hohlkörpers 1. Hierbei schiebt der Abdichtdorn 26 den
rohrförmigen Hohlkörper 1 axial in Richtung des Innenabschnitts
18, wobei der gleichzeitig aufgebrachte hydraulische
Innenhochdruck zur Bildung einer Ausbauchung 29 am
Hohlkörper 1a führt. Der Stützkörper 16 verhindert ein
Ausknicken des Hohlkörpers 1a während des Nachschiebens.
Durch das Nachschieben werden unzulässige Materialverdünnungen
im Bereich der Ausbauchung 29 vermieden.Figure 2 shows the representation in vertical longitudinal section
of Figure 1 during the forming process of the tubular
Der nächste Fertigungsschritt nach Figur 3 zeigt, wie der
umgeformte Hohlkörper 1a axial in Bildebene nach rechts
umgesetzt ist und der Abdichtdorn 26 mit dem Dichtkopf 15
einen neuen Längenabschnitt 28a und der Dichtkopf 15 mit
dem Stützkörper 17 einen Innenabschnitt 18a begrenzt.The next manufacturing step according to Figure 3 shows how the
reshaped hollow body 1a axially in the image plane to the right
is implemented and the sealing
Figur 4 zeigt, wie in der weiteren Fertigungsfolge eine
zweite Ausbauchung 30 an dem rohrförmigen Hohlkörper 1b
angebracht wird. Der Umformvorgang ist identisch mit dem
zu Figur 2 geschilderten.Figure 4 shows how in the further production sequence
In Figur 5 ist der Hohlkörper 1c dargestellt, der nach einer Biegeumformung aus dem Hohlkörper 1b aus Figur 4 hervorgegangen ist.FIG. 5 shows the hollow body 1c, which follows a bending deformation from the hollow body 1b from FIG. 4 emerged.
Der noch unverformte Endabschnitt 31 des Hohlkörpers 1c
wird, wie Figur 6 zeigt, in das Formwerkzeug eingebracht. The still
Figur 7 zeigt die Umformung gemäß Figur 2, wobei eine
weitere Ausbauchung 32 erzeugt wird.Figure 7 shows the forming according to Figure 2, one
Der Hohlkörper 1d wird gemäß der Fertigungsschritte in
Figur 3 und Figur 4 axial umgesetzt und es wird ein letztes
Mal eine Ausbauchung 33 hergestellt.The hollow body 1d is in accordance with the manufacturing steps in
Figure 3 and Figure 4 axially implemented and it will be a
Figur 8 zeigt im vertikalen Längsschnitt den rohrförmigen
Hohlkörper 1e, wie er aus den in den Figuren 1 bis 7 dargestellten
Fertigungsschritten hervorgegangen ist, im
Endzustand nach der Innenhochdruckverformung. Der gebogene
und mit Ausbauchungen 29, 30, 32, 33 versehene
Hohlkörper 1e kann dann einer ggf. erforderlichen Weiterbehandlung
zugeführt werden. Figure 8 shows the tubular longitudinal section
Hollow body 1e, as shown in the figures 1 to 7
Manufacturing steps has emerged in
Final state after the internal high pressure deformation. The curved one
and provided with
- 1 -1 -
-
rohrförmiger Hohlkörper
- 1a -
- rohrförmiger Hohlkörper
- 1b -
- rohrförmiger Hohlkörper
- 1c -
- rohrförmiger Hohlkörper
- 1d -
- rohrförmiger Hohlkörper
- 1e -
- rohrförmiger Hohlkörper
- 1a -
- tubular hollow body
- 1b -
- tubular hollow body
- 1c -
- tubular hollow body
- 1d -
- tubular hollow body
- 1e -
- tubular hollow body
- 2 -2 -
- Längenabschnitt v. 1Longitudinal section v. 1
- 3 -3 -
- FormwerkzeugMolding tool
- 4 -4 -
- ObergesenkUpper die
- 5 -5 -
- UntergesenkLower die
- 6 -6 -
- Kontur v. 4Contour of 4th
- 7 -7 -
- Kontur v. 5Contour of 5
- 8 -8th -
- Längenbereich v. 3Length range from 3rd
- 9 -9 -
- AufweitungWidening
- 10 -10 -
- KonturabschnittContour section
- 11 -11 -
- KonturabschnittContour section
- 12 -12 -
- AufweitungWidening
- 13 -13 -
- Übergangcrossing
- 14 -14 -
- - Dicht- und Stützwerkzeug- Sealing and support tool
- 15 -15 -
- DichtkopfSealing head
- 16 -16 -
- StützkörperSupport body
- 17 -17 -
- FührungsstangeGuide rod
- 18 -18 -
- Innenabschnitt v. 1Inner section v. 1
- 18a-18a-
- Innenabschnitt v. 1aInner section v. 1a
- 19 -19 -
- abgedichtetes Ende v. 18sealed end v. 18th
- 20 -20 -
- abgestütztes Ende v. 18supported end of 18th
- 21 -21 -
- Platte v. 15Plate v. 15
- 21'-21'-
- Platte v. 15Plate v. 15
- 22 -22 -
- DichteinlageSealing insert
- 23 -23 -
- Aussenseite v. 15Outside v. 15
- 24 -24 -
- DichtwulstSealing bead
- 25 -25 -
- Oberfläche v. 1 Surface v. 1
- 26 -26 -
- AbdichtdornSealing mandrel
- 27 -27 -
- Axialkanal in 26Axial channel in 26
- 28 -28 -
- Längenabschnitt v .1Longitudinal section v. 1
- 28a-28a-
- Längenabschnitt v. 1aLongitudinal section v. 1a
- 29 -29 -
- AusbauchungBulge
- 30 -30 -
- AusbauchungBulge
- 31 -31 -
- Endabschnitt v. 1cEnd section v. 1c
- 32 -32 -
- AusbauchungBulge
- 33 -33 -
- AusbauchungBulge
- L -L -
- Länge v. 15Length of 15
- L1 -L1 -
- Länge v. 11Length of 11
Claims (4)
- A method of producing a tubular hollow member (1, 1a-1e) with spaced-apart bulges (29, 30, 32, 33) in the longitudinal direction of the hollow member (1, 1a-1e) by internal high-pressure deformation and external support at least at places in a two-part mould (3) which has a contour provided with a wide part (9) for forming a bulge (29, 30, 32, 33) in the hollow member, wherein an internal portion (18) of the hollow member (1, 1a-1e) is first sealed at one end (19) and internally supported at the other end (20) and a bulge (29) is made in the internal portion (18) by internal hydraulic high pressure followed by axial pushing of the hollow member (1, 1a-1e), characterised in that in order to produce a first bulge (29) in the hollow member (1, 1a-1e), a sealing and supporting tool (14) having a sealing head (15) and a supporting member (16) is inserted, wherein the sealing head (15) and the supporting member are each positioned in their axial position in the hollow member (1, 1a-1e) and the sealing head (15) is movable by a guide rod (17) extending with radial clearance through the supporting member (16) and is brought into media-tight abutment against the inner surface (25) of the hollow member (1, 1a-1e), whereupon after axial adjustment of the hollow member (1, 1a-1e) in the moulding tool (3), a further bulge (30, 32, 33) is made in the same way and the hollow member (1, 1a-1e) is bent between the production of two bulges (30, 32).
- A method according to claim 1, characterised in that the hydraulic internal high pressure is applied from the supported end (20) of the hollow member (1, 1a-1e).
- A method according to claim 1 or 2,
characterised in that the bulges (29, 30, 32, 33) are opened at the end face. - A method according to any of claims 1 to 3,
characterised in that two plates (21, 21') in the sealing head (15) are moved towards one another with a sealing insert (22) in between.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19810422A DE19810422C1 (en) | 1998-03-11 | 1998-03-11 | Method of forming tubes with spaced bulges |
| DE19810422 | 1998-03-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0941780A1 EP0941780A1 (en) | 1999-09-15 |
| EP0941780B1 true EP0941780B1 (en) | 2001-11-14 |
Family
ID=7860445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99104527A Expired - Lifetime EP0941780B1 (en) | 1998-03-11 | 1999-03-06 | Method and device for producing a hollow body with bulges at a distance from oneanother |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6044678A (en) |
| EP (1) | EP0941780B1 (en) |
| DE (1) | DE19810422C1 (en) |
| ES (1) | ES2163312T3 (en) |
| PT (1) | PT941780E (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19802484C2 (en) * | 1998-01-23 | 2000-06-08 | Daimler Chrysler Ag | Method and device for producing assembled camshafts |
| DE10004159C2 (en) * | 2000-02-01 | 2001-12-06 | Bosch Gmbh Robert | Nozzle assembly for gas burners |
| US6176114B1 (en) * | 2000-05-23 | 2001-01-23 | General Motors Corporation | Method and apparatus for sequential axial feed hydroforming |
| FR2828120B1 (en) * | 2001-08-06 | 2003-10-10 | Brigitte Dossmann | METHOD AND DEVICE FOR BENDING A CYLINDRICAL TUBE OR THE LIKE |
| US6695711B2 (en) * | 2002-01-28 | 2004-02-24 | Royal Precision, Inc. | Hydroformed metallic golf club shafts and method therefore |
| DE10212400C5 (en) * | 2002-03-13 | 2010-05-20 | Benteler Automobiltechnik Gmbh | Process for producing a molded component |
| US6984179B2 (en) | 2002-10-28 | 2006-01-10 | Royal Precision, Inc. | Golf club shafts having variable taper lengths |
| US20040138000A1 (en) * | 2003-01-15 | 2004-07-15 | Braly W. Kim | Lightweight, durable golf club shafts |
| CN100489165C (en) * | 2004-06-15 | 2009-05-20 | 沈传良 | Machining mould and method for stainless reeling silk bobbin |
| US20060260374A1 (en) * | 2005-05-23 | 2006-11-23 | Flex-Weld, Inc. | Hydroforming machine |
| DE102016112157B4 (en) * | 2016-07-04 | 2019-05-23 | Linamar Gmbh | Method and device for producing a camshaft and camshaft |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1136143A (en) * | 1954-11-22 | 1957-05-09 | Manufacturing process of flexible metal pipes | |
| US3130771A (en) * | 1957-09-20 | 1964-04-28 | Federal Mogul Bower Bearings | Metal bellows forming apparatus |
| DE3004838C2 (en) * | 1980-02-09 | 1984-09-13 | Benteler-Werke Ag Werk Neuhaus, 4790 Paderborn | Device for the production of a tubular body with transverse waves |
| US4840053A (en) * | 1987-07-29 | 1989-06-20 | Mitsui & Co., Ltd. | Method for manufacturing a pipe with projections |
| US4788843A (en) * | 1987-08-14 | 1988-12-06 | R. Seaman Company | Method and apparatus for hydraulically forming a tubular body |
| JPH02290626A (en) * | 1989-04-27 | 1990-11-30 | Nhk Spring Co Ltd | Method and device for manufacturing metallic bellows |
| US5481892A (en) * | 1989-08-24 | 1996-01-09 | Roper; Ralph E. | Apparatus and method for forming a tubular member |
| IT1240233B (en) * | 1990-02-02 | 1993-11-27 | Europa Metalli Lmi | PROCEDURE FOR THE PRODUCTION OF MONOLITHIC ELEMENTS CABLES IN METALLIC MATERIAL |
| US5235836A (en) * | 1990-03-06 | 1993-08-17 | Ti Corporate Services Limited | Seal head for tube expansion apparatus |
| DE19622372B4 (en) * | 1996-06-04 | 2006-06-01 | Htm Härtetechnik & Metallbearbeitung Gmbh | Method and device for producing camshafts |
-
1998
- 1998-03-11 DE DE19810422A patent/DE19810422C1/en not_active Expired - Fee Related
-
1999
- 1999-03-06 PT PT99104527T patent/PT941780E/en unknown
- 1999-03-06 EP EP99104527A patent/EP0941780B1/en not_active Expired - Lifetime
- 1999-03-06 ES ES99104527T patent/ES2163312T3/en not_active Expired - Lifetime
- 1999-03-10 US US09/266,141 patent/US6044678A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| PT941780E (en) | 2002-05-31 |
| US6044678A (en) | 2000-04-04 |
| ES2163312T3 (en) | 2002-01-16 |
| DE19810422C1 (en) | 1999-08-12 |
| EP0941780A1 (en) | 1999-09-15 |
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