EP1699580A1 - Method and device for the production of a hollow cylinder from a blank - Google Patents

Method and device for the production of a hollow cylinder from a blank

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Publication number
EP1699580A1
EP1699580A1 EP04802020A EP04802020A EP1699580A1 EP 1699580 A1 EP1699580 A1 EP 1699580A1 EP 04802020 A EP04802020 A EP 04802020A EP 04802020 A EP04802020 A EP 04802020A EP 1699580 A1 EP1699580 A1 EP 1699580A1
Authority
EP
European Patent Office
Prior art keywords
workpiece
forging
clamping head
mandrel
piercing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04802020A
Other languages
German (de)
French (fr)
Other versions
EP1699580B1 (en
Inventor
Robert Koppensteiner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GFM Beteiligungs und Management GmbH and Co KG
Original Assignee
GFM Beteiligungs und Management GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by GFM Beteiligungs und Management GmbH and Co KG filed Critical GFM Beteiligungs und Management GmbH and Co KG
Publication of EP1699580A1 publication Critical patent/EP1699580A1/en
Application granted granted Critical
Publication of EP1699580B1 publication Critical patent/EP1699580B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/02—Special design or construction
    • B21J9/04—Piercing presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/10—Piercing billets

Definitions

  • the invention relates to a method for producing a cylindrical hollow body from a blank, the workpiece being opened by successive forging deformations which are angularly offset relative to one another about the axis of the workpiece, and at the same time being pushed onto a mandrel.
  • the piercing mandrel is essentially only used to widen the core of the workpiece that has already been opened (RU 2 010 655 C1)
  • the surface cracks that occur when the core is opened can only be smoothed and partially covered by the mandrel, because the material in the crack area oxidizes so far and cools down that even with hot forging it is no longer possible to weld the cracks in the area of the piercing mandrel.
  • the invention is therefore based on the object of designing a method for producing a cylindrical hollow body from a blank of the type described at the outset in such a way that the workpiece feed can be increased considerably without fear of crack formation in the inner surface area of the hollow body.
  • the invention achieves the stated object in that the workpiece is pressed during the forging deformations with a predeterminable axial force against the piercing pin which can be pushed against the workpiece against this axial force and which is moved back into its starting position between the successive forging deformations synchronously with the axial feed of the workpiece.
  • the piercing mandrel is advanced against the workpiece during the forging deformation of the workpiece in order to be returned to its starting position synchronously with the workpiece between the individual forging deformations during the axial workpiece feed, the workpiece feed depends on the working stroke of the piercing mandrel, so that the workpiece feed can be selected according to the respective punching conditions.
  • the prerequisite is that sufficient axial force is applied to the workpiece to prevent the workpiece from yielding to the piercing mandrel during its working stroke.
  • the axial force to be applied to the workpiece therefore depends, among other things, on the respective material, the temperature and the deformation properties of the workpiece and the frictional relationships between the punching tool and the workpiece.
  • the workpiece is provided with a central recess on its end face facing the piercing mandrel, into which the piercing mandrel engages at the beginning of the forging deformation, deformation conditions can already be created in the region of the end face of the workpiece facing the piercing mandrel, which create a crack-free inner surface of the ensure the hollow body to be manufactured.
  • the hole diameter of the workpiece can be gradually increased in successive steps under forging deformation.
  • a device with at least two forging tools diametrically opposite one another with respect to the workpiece and with one forging the forging tools in the direction of advance of the workpiece can be used.
  • stored clamping head which is connected to an axial feed drive and a rotary drive, and with a perforated mandrel axially displaceable via an actuating drive on the side of the forging tools opposite the upstream clamping head.
  • the clamping head upstream of the forging tools is provided with an end stop for the workpiece and with a press cylinder for the workpiece supported at the end, then only the piercing mandrel needs to be axially displaceably displaceable via its actuator depending on the feed drive of the clamping head to be advanced with a corresponding axial loading of the workpiece, the piercing mandrel during the engagement of the forging tools against the workpiece feed direction between the forging tools, to the workpiece due to the piercing mandrel-related compressive stresses and the tensile stresses effective in the opening direction of the workpiece core due to the forging deformation Way to punch.
  • the workpiece must be rotated by a predetermined angle about its axis with the help of the clamping head in front of the forging tools and axially pushed against the forging tools in accordance with the working stroke of the piercing mandrel, with the piercing mandrel in synchronism with the workpiece feed its initial position is to be moved back in order to continue and finish the perforation in repetitive deformation steps. It goes without saying that these perforations go through the length of the workpiece, but can only extend over a partial length.
  • the workpiece can be axially loaded with the help of the clamping head in front of the forging tools itself if the workpiece is supported at the front in the clamping head and the press cylinder engages the clamping head. More favorable design conditions result, however, if the press cylinder is provided on the clamping head and acts on the end stop for the workpiece forming a receiving opening for the piercing mandrel. This enables the feed drive of the clamping head be separated from the press cylinder, so that the stroke of the pressing cylinder compared with the required adjustment path for the feed drive small held ⁇ th can be.
  • the clamping head downstream of the forging tools must also be provided with a rotary drive. If the workpiece has to be released from the upstream clamping head when punching the end of the workpiece facing the upstream clamping head, the workpiece feed is to be ensured by the downstream clamping head, which must also rotate the workpiece with the axial workpiece feed.
  • the piercing mandrel can have a piercing tool with graduated diameter sections.
  • the piercing mandrel must be positioned in relation to the forging tools in accordance with the respective working area, so that the core opening can be used for piercing for each diameter section of the piercing tool.
  • this step-wise punching of the workpiece need not be limited to a workpiece pass direction. It is therefore entirely possible to equip both clamping heads with a press cylinder for the frontal loading of the workpiece in order to be able to apply a corresponding axial force to the workpiece in both feed directions. In such a case, the punch must axially penetrate the press cylinder of the associated clamping head.
  • This punching in opposite feed directions can be carried out with the help of a single punch. lead when the decisive for punching punch out ⁇ is replaced. But it is also possible to assign a separate punch to each clamping head, which then passes axially through the respective press cylinder.
  • FIG. 1 shows a device according to the invention for producing a cylindrical hollow body in a schematic side view
  • Fig. 2 shows this device in detail in the area of the forging tools and the clamping head upstream of these forging tools in a schematic axial section on a larger scale and
  • Fig. 3 shows a modified embodiment of a device according to the invention in a schematic axial section in sections in the area of the forging tools on a larger scale.
  • the device shown has forging tools 1 in the form of forging hammers which are diametrically opposite to one another with respect to the workpiece 2. Although only two forging tools can be seen, two pairs of hammers, which are offset by 90 ° to one another and are actuated alternately, are generally provided to increase performance.
  • the clamping head 4 is rotatably mounted in a housing 5 which carries a rotary drive 6 for the clamping head 4.
  • the housing 5 with the clamping head 4 is adjustable along a guide 9 by means of a carriage 7 via a feed drive 8, preferably an actuating cylinder.
  • the clamping head 4 also has an end stop 10 for workpiece 2. This stop 10 is urged axially over the piston rod 11 of a pressing cylinder 12, which is flanged to the housing 5 of the Spannkop ⁇ fes. 4
  • a rotary drive 13 which can be controlled synchronously with the rotary drive 6 for the clamping head 4 can be provided for the piston rod 11. Care should be taken to ensure that, despite the rotationally fixed connection, the axial displaceability of the piston rod 11 is not impaired.
  • a further clamping head 14 is arranged downstream of the forging tools 1, which is likewise rotatably mounted in a housing 15 and is driven by a rotary drive 16.
  • the clamping head 14 is supported with the housing 5 via a slide 17 which can be moved along a guide 19 by a feed drive 18.
  • the hollow clamping head 14 is, however, penetrated by a perforated mandrel 20 which can be driven back and forth via an actuator 21 depending on the workpiece feed.
  • the piercing tool 22 of the piercing mandrel 20, which projects into the area of the forging deformations of the workpiece 2 between the forging tools 1, has a tapering end 23 and a cylindrical calibration section 24 adjoining it, so that the punching and calibration are carried out in one operation can.
  • the workpiece 2 is provided with a central depression 25 before the actual punching process, which is drilled before the workpiece 2 is clamped, but also after clamping by the punch 22 itself or a special tool that can be positioned in the center of the machine.
  • the workpiece 2 is moved step by step through the forging device by means of the feed drive 8 in the periods in which it is released by the forging tools 1 and at the same time rotated by a predetermined angular step about its axis with the aid of the rotary drive 6. The after these feed movements over the forging tools
  • the piercing mandrel 20 is advanced between the forging tools 1 against the feed direction 3 of the workpiece 2 during the forging deformation of the workpiece 2, the workpiece 2 being subjected to a corresponding pressing force in the feed direction 3 by the press cylinder 12.
  • the piercing mandrel 20 is returned to its starting position in synchronism with the feed drive 8 via the actuating cylinder 21, in order to be pushed against the workpiece 2 again against the feed direction 3 during the subsequent forging deformation. If the workpiece 2 is perforated over its entire axial extent, the workpiece feed in the axial direction and in the circumferential direction can no longer be carried out by the clamping head 4 upstream of the forging tools 1 as soon as the workpiece end assigned to this clamping head 4 is machined. In this case, the opposite clamping head 14 takes over the feed movements both in the axial and in the circumferential direction. The application of the workpiece 2 via the press cylinder 12 of the chuck 4 remains however.
  • the end stop 10 for the workpiece 2 is provided with a receiving opening 26 for the punch 22, so that the workpiece support is continuously secured via the press cylinder 12.
  • the workpiece 2 can be machined in stages.
  • a Such machining with the aid of a punch 20, the punch 22 having two stepped diameter sections 27, 28 is shown in FIG. 3.
  • the existing perforation is widened with the aid of the larger diameter section 28, again with simultaneous forging deformation, so that the tensile stresses effective through this forging deformation can be used advantageously for the punching process.
  • the piercing mandrel 20 In order to widen the perforation, the piercing mandrel 20 must be displaced by means of the actuator 21 such that the diameter section 28 of the perforating tool 22 comes to rest in the area of the forging deformations of the workpiece 2 by the forging tools 1.
  • the invention is of course not limited to the exemplary embodiments shown. All that is required is a corresponding axial loading of the workpiece during the working stroke of the piercing mandrel 20, the working stroke being carried out during the forging deformation.
  • the forging can be deformed by forging hammers, but also by forging presses.
  • the workpiece 2 can also be hot, semi-hot, but also cold formed in the manner described.
  • the forging tools can also be controlled so that they are switched from a core-loosening to a simultaneous, core-compacting stroke sequence after perforating the workpiece.
  • the piercing mandrel 20 itself can be kept non-rotatable, but can also rotate with the workpiece or can additionally be driven to rotate relative to the workpiece.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

A method is described for producing a cylindrical hollow body from a blank, with the workpiece being opened in the core region by successive swaging which is angularly offset against each other about the axis of the workpiece and being simultaneously pushed onto a piercing mandrel. In order to improve the piercing it is proposed that the workpiece is pressed during the swaging with a predeterminable axial force against the piercing mandrel which can be advanced against the workpiece against this axial force, which piercing mandrel is moved back to its initial position synchronous with the axial feed of the workpiece between the successive swaging steps.

Description

Verfahren und Vorrichtung zum Herstellen eines zylindrischen Hohlkörpers aus einem RohlingMethod and device for producing a cylindrical hollow body from a blank
Technisches GebietTechnical field
Die Erfindung bezieht sich auf ein Verfahren zum Herstellen eines zylindrischen Hohlkörpers aus einem Rohling, wobei das Werkstück durch aufeinanderfolgende, gegeneinander um die Achse des Werkstücks winkelversetzte Schmiedeverformungen im Kernbereich geöffnet und zugleich auf einen Lochdorn aufgeschoben wird.The invention relates to a method for producing a cylindrical hollow body from a blank, the workpiece being opened by successive forging deformations which are angularly offset relative to one another about the axis of the workpiece, and at the same time being pushed onto a mandrel.
Stand der TechnikState of the art
Zum Herstellen eines zylindrischen Hohlkörpers aus einem vollen Rohling durch ein Schmieden ist es bekannt (EP 0 610 509 B1), den Rohling aufeinanderfolgenden, radialen Schmiedeverformungen auszusetzen und zwischen den einzelnen Schmiedeverformungen um seine Achse zu drehen. Es hat sich nämlich gezeigt, daß bei einem bestimmten, den Kernbereich des Rohlings erfassenden Verformungsgrad durch Schmiedekräfte, die von einander diametral gegenüberliegenden Seiten auf den Rohling einwirken, im Kernbereich des Rohlings Zugspannungen auftreten, die ein Öffnen des Kerns bewirken, so daß durch ein schrittweises Drehen des Werkstücks zwischen den einzelnen Schmiedeverformungen aus einem vollen Rohling ein zylindrischer Hohlkörper geschmiedet werden kann. Nachteilig ist allerdings, daß durch die unvermeidbaren Inhomogenitäten der Kernwerkstoff unregelmäßig geöffnet wird und im Bereich der Innenwandung des entstehenden Hohlkörpers Risse verbleiben, die die Festigkeitseigenschaften des Werkstücks erheblich beeinträchtigen. Zur Vermeidung solcher Risse im Bereich der inneren Oberfläche des Hohlkörpers wurde bereits vorgeschlagen (SU 715 195 A), den Kern durch einen Lochdorn zu öffnen, der in den Bereich der Schmiedeverformung des Rohlings ragt, also in einen Bereich in dem die durch die Schmiedeverformung bedingten Zugspannungen wirksam werden. Diese auf den Kern einwirkenden Zugspannungen erleichtern das Eindringen des Lochdorns in den Kern des Werkstücks, wobei Risse vermieden werden, wenn durch die axiale Lage des Dorns ein Öffnen des Kerns vor dem Dorn unterbunden wird. Da der Lochdorn im wesentlichen nur während der Schmiedeverformungen des Werkstücks in den Rohling eindringt, wird der axiale Werkstückvorschub zwischen den einzelnen Schmiedeverformungen durch die elastische Verformbarkeit des Lochdorns in axialer Richtung bestimmt, was den Werkstückvorschub erheblich einschränkt. Wird jedoch der Lochdorn im wesentlichen nur zum Aufweiten des bereits geöffneten Kerns des Werkstücks eingesetzt (RU 2 010 655 C1) so können die beim Öffnen des Kerns entstehenden Oberflächenrisse durch den Dorn nur geglättet und zum Teil überdeckt werden, weil der Werkstoff im Rißbereich soweit oxidiert und abkühlt, daß selbst bei einem Warmschmieden ein Verschweißen der Risse im Bereich des Lochdorns nicht mehr möglich ist.For the production of a cylindrical hollow body from a full blank by forging it is known (EP 0 610 509 B1) to expose the blank to successive radial forging deformations and to rotate it about its axis between the individual forging deformations. It has been shown that with a certain degree of deformation, which detects the core area of the blank by forging forces which act on the blank from diametrically opposite sides, tensile stresses occur in the core area of the blank, which cause the core to open, so that a gradual Turning the workpiece between the individual forging deformations allows a cylindrical hollow body to be forged from a full blank. It is disadvantageous, however, that the inevitable inhomogeneities open the core material irregularly and cracks remain in the area of the inner wall of the resulting hollow body, which considerably impair the strength properties of the workpiece. To avoid such cracks in the area of the inner surface of the hollow body It has already been proposed (SU 715 195 A) to open the core through a piercing mandrel that projects into the area of the forging deformation of the blank, that is, into an area in which the tensile stresses caused by the forging deformation become effective. These tensile stresses acting on the core facilitate the penetration of the piercing mandrel into the core of the workpiece, cracks being avoided if the opening of the core in front of the mandrel is prevented by the axial position of the mandrel. Since the piercing mandrel essentially only penetrates into the blank during the forging deformations of the workpiece, the axial workpiece feed between the individual forging deformations is determined by the elastic deformability of the piercing mandrel in the axial direction, which considerably restricts the workpiece feed. However, if the piercing mandrel is essentially only used to widen the core of the workpiece that has already been opened (RU 2 010 655 C1), the surface cracks that occur when the core is opened can only be smoothed and partially covered by the mandrel, because the material in the crack area oxidizes so far and cools down that even with hot forging it is no longer possible to weld the cracks in the area of the piercing mandrel.
Darstellung der ErfindungPresentation of the invention
Der Erfindung liegt somit die Aufgabe zugrunde, ein Verfahren zum Herstellen eines zylindrischen Hohlkörpers aus einem Rohling der eingangs geschilderten Art so auszugestalten, daß der Werkstückvorschub erheblich gesteigert werden kann, ohne eine Rißbildung im inneren Oberflächenbereich des Hohlkörpers befürchten zu müssen.The invention is therefore based on the object of designing a method for producing a cylindrical hollow body from a blank of the type described at the outset in such a way that the workpiece feed can be increased considerably without fear of crack formation in the inner surface area of the hollow body.
Die Erfindung löst die gestellte Aufgabe dadurch, daß das Werkstück während der Schmiedeverformungen mit einer vorgebbaren Axialkraft gegen den entgegen dieser Axialkraft gegen das Werkstück vorschiebbaren Lochdorn gedrückt wird, der zwischen den aufeinanderfolgenden Schmiedeverformungen synchron mit dem axialen Vorschub des Werkstücks in seine Ausgangsstellung zurückbewegt wird. Da zufolge dieser Maßnahmen der Lochdorn während der Schmiedeverformung des Werkstücks gegen das Werkstück vorgeschoben wird, um zwischen den einzelnen Schmiedeverformungen während des axialen Werkstückvorschubes synchron mit dem Werkstück in seine Ausgangslage zurückgestellt zu werden, hängt der Werkstückvorschub vom Arbeitshub des Lochdorns ab, so daß der Werkstückvorschub entsprechend den jeweiligen Lochungsbedingungen gewählt werden kann. Voraussetzung ist, daß das Werkstück mit einer ausreichenden Axialkraft beaufschlagt wird, um ein Nachgeben des Werkstücks gegenüber dem Lochdorn während dessen Arbeitshubes auszuschließen. Die auf das Werkstück aufzubringende Axialkraft hängt daher unter anderem vom jeweiligen Werkstoff, von der Temperatur und von den Verformungseigenschaften des Werkstücks sowie den Reibungsverhältnissen zwischen dem Lochwerkzeug und dem Werkstück ab.The invention achieves the stated object in that the workpiece is pressed during the forging deformations with a predeterminable axial force against the piercing pin which can be pushed against the workpiece against this axial force and which is moved back into its starting position between the successive forging deformations synchronously with the axial feed of the workpiece. As a result of these measures, the piercing mandrel is advanced against the workpiece during the forging deformation of the workpiece in order to be returned to its starting position synchronously with the workpiece between the individual forging deformations during the axial workpiece feed, the workpiece feed depends on the working stroke of the piercing mandrel, so that the workpiece feed can be selected according to the respective punching conditions. The prerequisite is that sufficient axial force is applied to the workpiece to prevent the workpiece from yielding to the piercing mandrel during its working stroke. The axial force to be applied to the workpiece therefore depends, among other things, on the respective material, the temperature and the deformation properties of the workpiece and the frictional relationships between the punching tool and the workpiece.
Wird das Werkstück vor der Schmiedeverformung auf seiner dem Lochdorn zugekehrten Stirnseite mit einer zentrischen Vertiefung versehen, in die der Lochdorn am Beginn der Schmiedeverformung eingreift, so können bereits im Bereich der dem Lochdorn zugekehrten Stirnseite des Werkstücks Verformungsbedingungen geschaffen werden, die eine rißfreie innere Oberfläche des zu fertigenden Hohlkörpers sicherstellen.If, prior to the forging deformation, the workpiece is provided with a central recess on its end face facing the piercing mandrel, into which the piercing mandrel engages at the beginning of the forging deformation, deformation conditions can already be created in the region of the end face of the workpiece facing the piercing mandrel, which create a crack-free inner surface of the ensure the hollow body to be manufactured.
Reicht die mit Hilfe eines Lochdorns im Zusammenwirken mit einem Querschmieden bedingte Werkstückverformung nicht aus, um einen vorgegebenen Lochdurchmesser zu erreichen, so kann der Lochdurchmesser des Werkstücks in aufeinanderfolgenden Schritten jeweils unter einer Schmiedeverformung stufenweise vergrößert werden.If the workpiece deformation caused by a punch in cooperation with a cross-forging is not sufficient to achieve a predetermined hole diameter, the hole diameter of the workpiece can be gradually increased in successive steps under forging deformation.
Zur Durchführung eines Verfahrens zum Herstellen eines zylindrischen Hohlkörpers kann von einer Vorrichtung mit wenigstens zwei einander bezüglich des Werkstücks diametral gegenüberliegenden Schmiedewerkzeugen, mit einem den Schmiedewerkzeugen in Vorschubrichtung des Werkstücks vorge- lagerten Spannkopf, der mit einem axialen Vorschubantrieb und einem Drehantrieb verbunden ist, und mit einem über einen Stelltrieb axial verlagerbaren Lochdorn auf der dem vorgelagerten Spannkopf gegenüberliegenden Seite der Schmiedewerkzeuge ausgegangen werden. Wird bei einer solchen Vorrichtung der den Schmiedewerkzeugen vorgelagerte Spannkopf mit einem stirnseitigen Anschlag für das Werkstück sowie mit einem Preßzylinder für das stirnseitig abgestützte Werkstück versehen, so braucht nur mehr der Lochdorn über seinen Stelltrieb in Abhängigkeit vom Vorschubantrieb des Spannkopfes axial hin- und hergehend verschiebbar ausgeführt zu werden, um bei einer entsprechenden axialen Beaufschlagung des Werkstücks den Lochdorn während des Eingriffs der Schmiedewerkzeuge entgegen der Werkstückvorschubrichtung zwischen den Schmiedewerkzeugen vorzuschieben, um das Werkstück aufgrund der durch den Lochdorn bedingten Druckspannungen und der zugleich im Öffnungssinn des Werkstückkerns wirksamen Zugspannungen zufolge der Schmiedverformung in vorteilhafter Weise zu lochen. Werden die Schmiedewerkzeug außer Eingriff mit dem Werkstück gebracht, so ist das Werkstück mit Hilfe des den Schmiedewerkzeugen vorgelagerten Spannkopfes um einen vorgegebenen Winkel um seine Achse zu drehen und entsprechend dem Arbeitshub des Lochdorns axial gegen die Schmiedewerkzeuge vorzuschieben, wobei mit dem Werkstückvorschub synchron der Lochdorn in seine Ausgangsstellung zurückzubewegen ist, um die Lochung in sich wiederholenden Verformungsschritten fortzusetzen und zu beenden. Es versteht sich wohl von selbst, daß diese Lochung über die Werkstücklänge durchgehen, sich aber auch nur über eine Teillänge erstrecken kann.To carry out a method for producing a cylindrical hollow body, a device with at least two forging tools diametrically opposite one another with respect to the workpiece and with one forging the forging tools in the direction of advance of the workpiece can be used. stored clamping head, which is connected to an axial feed drive and a rotary drive, and with a perforated mandrel axially displaceable via an actuating drive on the side of the forging tools opposite the upstream clamping head. If, in such a device, the clamping head upstream of the forging tools is provided with an end stop for the workpiece and with a press cylinder for the workpiece supported at the end, then only the piercing mandrel needs to be axially displaceably displaceable via its actuator depending on the feed drive of the clamping head to be advanced with a corresponding axial loading of the workpiece, the piercing mandrel during the engagement of the forging tools against the workpiece feed direction between the forging tools, to the workpiece due to the piercing mandrel-related compressive stresses and the tensile stresses effective in the opening direction of the workpiece core due to the forging deformation Way to punch. If the forging tool is disengaged from the workpiece, the workpiece must be rotated by a predetermined angle about its axis with the help of the clamping head in front of the forging tools and axially pushed against the forging tools in accordance with the working stroke of the piercing mandrel, with the piercing mandrel in synchronism with the workpiece feed its initial position is to be moved back in order to continue and finish the perforation in repetitive deformation steps. It goes without saying that these perforations go through the length of the workpiece, but can only extend over a partial length.
Die axiale Beaufschlagung des Werkstücks kann mit Hilfe des den Schmiedewerkzeugen vorgelagerten Spannkopfes selbst erfolgen, wenn für eine stirnseitige Abstützung des Werkstücks im Spannkopf gesorgt wird und der Preßzylinder am Spannkopf angreift. Günstigere Konstruktionsverhältnisse ergeben sich allerdings, wenn der Preßzylinder am Spannkopf vorgesehen ist und den eine Aufnahmeöffnung für den Lochdorn bildenden, stirnseitigen Anschlag für das Werkstück beaufschlagt. Damit kann der Vorschubantrieb des Spannkopfes vom Preßzylinder getrennt werden, so daß der Hub des Preßzylinders im Vergleich mit dem für den Vorschubantrieb erforderlichen Stellweg klein gehal¬ ten werden kann. Zum Vermeiden einer Behinderung der zwischen den Eingrif¬ fen der Schmiedewerkzeuge erforderlichen Werkstückdrehung durch die axiale Beaufschlagung des Werkstücks mit Hilfe des Preßzylinders kann der Preßzylinder mit einem Drehantrieb für den stirnseitigen Anschlag verbunden werden, um das Werkstück mit dem stirnseitigen Anschlag synchron zu verdrehen.The workpiece can be axially loaded with the help of the clamping head in front of the forging tools itself if the workpiece is supported at the front in the clamping head and the press cylinder engages the clamping head. More favorable design conditions result, however, if the press cylinder is provided on the clamping head and acts on the end stop for the workpiece forming a receiving opening for the piercing mandrel. This enables the feed drive of the clamping head be separated from the press cylinder, so that the stroke of the pressing cylinder compared with the required adjustment path for the feed drive small held ¬ th can be. To avoid obstruction of the forging tools workpiece rotation required fen between the Eingrif ¬ by the axial loading of the workpiece by means of the pressing cylinder of the press cylinder can be connected to a rotary drive for the end-side stop, synchronously to the workpiece with the face-side stop to rotate.
Sind zwei den Schmiedewerkzeugen vor- und nachgeordnete Spannköpfe vorgesehen, was im allgemeinen stets dann erforderlich wird, wenn für die Herstellung eines rohrförmigen Werkstücks die Lochung über die gesamte Werkstücklänge vorgenommen wird, so ist auch der den Schmiedewerkzeugen nachgeordnete Spannkopf mit einem Drehantrieb zu versehen. Muß nämlich beim Lochen des dem vorgelagerten Spannkopf zugekehrten Werkstückendes das Werkstück vom vorgelagerten Spannkopf freigegeben werden, so ist der Werkstückvorschub durch den nachgeordneten Spannkopf sicherzustellen, der mit dem axialen Werkstückvorschub auch die Drehung des Werkstücks vornehmen muß.If two clamping heads upstream and downstream of the forging tools are provided, which is generally always necessary if the perforation is made over the entire length of the workpiece for the production of a tubular workpiece, the clamping head downstream of the forging tools must also be provided with a rotary drive. If the workpiece has to be released from the upstream clamping head when punching the end of the workpiece facing the upstream clamping head, the workpiece feed is to be ensured by the downstream clamping head, which must also rotate the workpiece with the axial workpiece feed.
Zur stufenweisen Vergrößerung des Lochdurchmessers kann der Lochdorn ein Lochwerkzeug mit abgestuften Durchmesserabschnitten aufweisen. Der Lochdorn ist dabei entsprechend dem jeweiligen Arbeitsbereich gegenüber den Schmiedewerkzeugen zu positionieren, so daß für jeden Durchmesserabschnitt des Lochwerkzeuges die Kernöffnung durch ein Querschmieden für das Lochen ausgenützt werden kann. Dieses stufenweise Lochen des Werkstücks braucht jedoch nicht auf eine Werkstückdurchlaufrichtung beschränkt zu werden. So ist es durchaus möglich, beide Spannköpfe mit einem Preßzylinder zur stirnseitigen Beaufschlagung des Werkstücks auszurüsten, um das Werkstück in beiden Vorschubrichtungen mit einer entsprechenden Axialkraft beaufschlagen zu können. Der Lochdorn muß in einem solchen Fall den Preßzylinder des zugehörigen Spannkopfes axial durchsetzen. Dieses Lochen in entgegengesetzten Vorschubrichtungen kann mit Hilfe eines einzigen Lochdorns durchge- führt werden, wenn das für die Lochung maßgebende Lochwerkzeug ausge¬ wechselt wird. Es ist aber auch möglich, jedem Spannkopf einen gesonderten Lochdorn zuzuordnen, der dann den jeweiligen Preßzylinder axial durchsetzt.To gradually increase the hole diameter, the piercing mandrel can have a piercing tool with graduated diameter sections. The piercing mandrel must be positioned in relation to the forging tools in accordance with the respective working area, so that the core opening can be used for piercing for each diameter section of the piercing tool. However, this step-wise punching of the workpiece need not be limited to a workpiece pass direction. It is therefore entirely possible to equip both clamping heads with a press cylinder for the frontal loading of the workpiece in order to be able to apply a corresponding axial force to the workpiece in both feed directions. In such a case, the punch must axially penetrate the press cylinder of the associated clamping head. This punching in opposite feed directions can be carried out with the help of a single punch. lead when the decisive for punching punch out ¬ is replaced. But it is also possible to assign a separate punch to each clamping head, which then passes axially through the respective press cylinder.
Kurze Beschreibung der ZeichnungBrief description of the drawing
Anhand der Zeichnung wird das erfindungsgemäße Verfahren näher erläutert.The method according to the invention is explained in more detail with reference to the drawing.
Es zeigenShow it
Fig. 1 eine erfindungsgemäße Vorrichtung zum Herstellen eines zylindrischen Hohlkörpers in einer schematischen Seitenansicht,1 shows a device according to the invention for producing a cylindrical hollow body in a schematic side view,
Fig. 2 diese Vorrichtung ausschnittsweise im Bereich der Schmiedewerkzeuge und des diesen Schmiedewerkzeugen vorgelagerten Spannkopfes in einem schematischen Axialschnitt in einem größeren Maßstab undFig. 2 shows this device in detail in the area of the forging tools and the clamping head upstream of these forging tools in a schematic axial section on a larger scale and
Fig. 3 eine abgewandelte Ausführungsform einer erfindungsgemäßen Vorrichtung in einem schematischen Axialschnitt ausschnittsweise im Bereich der Schmiedewerkzeuge in einem größeren Maßstab.Fig. 3 shows a modified embodiment of a device according to the invention in a schematic axial section in sections in the area of the forging tools on a larger scale.
Weg zur Ausführung der ErfindungWay of carrying out the invention
Die dargestellte Vorrichtung weist Schmiedewerkzeuge 1 in Form von Schmiedehämmern auf, die bezüglich des Werkstücks 2 einander diametral gegenüberliegen. Obwohl lediglich zwei Schmiedewerkzeuge ersichtlich sind, werden im allgemeinen zur Leistungssteigerung zwei zueinander um 90° winkelversetzte Hammerpaare vorgesehen, die abwechselnd betätigt werden. Das Werkstück 2, das in Form eines Rohlings mit vollem Querschnitt angeliefert wird, aber auch bereits rohrförmig ausgebildet sein kann, wird mit Hilfe eines den Schmiedewerkzeugen 1 in Vorschubrichtung 3 des Werkstücks 2 vorgelagerten Spannkopfes 4 geführt. Zu diesem Zweck ist der Spannkopf 4 in einem Gehäuse 5 drehbar gelagert, das einen Drehantrieb 6 für den Spannkopf 4 trägt. Das Gehäuse 5 mit dem Spannkopf 4 ist mittels eines Schlittens 7 über einen Vorschubantrieb 8, vorzugsweise einen Stellzylinder, entlang einer Führung 9 verstellbar. Der Spannkopf 4 weist außerdem einen stirnseitigen Anschlag 10 für das Werkstück 2 auf. Dieser Anschlag 10 wird über die Kolbenstange 11 eines Preßzylinders 12 axial beaufschlagt, der am Gehäuse 5 des Spannkop¬ fes 4 angeflanscht ist. Um das Mitdrehen des im Spannkopf 4 axial verschiebbar gelagerten Anschlages 10 mit dem Spannkopf 4 sicherzustellen, kann ein synchron mit dem Drehantrieb 6 für den Spannkopf 4 ansteuerbarer Drehantrieb 13 für die Kolbenstange 11 vorgesehen werden. Dabei ist darauf zu achten, daß trotz der drehfesten Verbindung die axiale Verschiebbarkeit der Kolbenstange 11 nicht beeinträchtigt wird.The device shown has forging tools 1 in the form of forging hammers which are diametrically opposite to one another with respect to the workpiece 2. Although only two forging tools can be seen, two pairs of hammers, which are offset by 90 ° to one another and are actuated alternately, are generally provided to increase performance. The workpiece 2, which is supplied in the form of a blank with a full cross section, but can also already be tubular, is guided with the aid of a clamping head 4 arranged upstream of the forging tools 1 in the feed direction 3 of the workpiece 2. For this purpose, the clamping head 4 is rotatably mounted in a housing 5 which carries a rotary drive 6 for the clamping head 4. The housing 5 with the clamping head 4 is adjustable along a guide 9 by means of a carriage 7 via a feed drive 8, preferably an actuating cylinder. The clamping head 4 also has an end stop 10 for workpiece 2. This stop 10 is urged axially over the piston rod 11 of a pressing cylinder 12, which is flanged to the housing 5 of the Spannkop ¬ fes. 4 In order to ensure that the stop 10, which is axially displaceably mounted in the clamping head 4, rotates with the clamping head 4, a rotary drive 13 which can be controlled synchronously with the rotary drive 6 for the clamping head 4 can be provided for the piston rod 11. Care should be taken to ensure that, despite the rotationally fixed connection, the axial displaceability of the piston rod 11 is not impaired.
Wie insbesondere aus der Fig. 1 ersichtlich ist, ist den Schmiedewerkzeugen 1 ein weiterer Spannkopf 14 nachgeordneten, der ebenfalls in einem Gehäuse 15 drehbar gelagert ist und über einen Drehantrieb 16 angetrieben wird. In analoger Weise wird der Spannkopf 14 mit dem Gehäuse 5 über einen Schlitten 17 gelagert, der von einem Vorschubantrieb 18 entlang einer Führung 19 verfahren werden kann. Der hohl ausgebildete Spannkopf 14 wird jedoch von einem Lochdorn 20 durchsetzt, der über einen Stelltrieb 21 in Abhängigkeit vom Werkstückvorschub hin- und hergehend angetrieben werden kann. Das Lochwerkzeug 22 des Lochdorns 20, das in den Bereich der Schmiedeverformungen des Werkstücks 2 zwischen die Schmiedewerkzeuge 1 ragt, weist ein sich verjüngendes Ende 23 und einen daran anschließenden, zylindrischen Kalibrierabschnitt 24 auf, so daß das Lochen und das Kalibrieren in einem Arbeitsgang vorgenommen werden kann.As can be seen in particular from FIG. 1, a further clamping head 14 is arranged downstream of the forging tools 1, which is likewise rotatably mounted in a housing 15 and is driven by a rotary drive 16. In an analogous manner, the clamping head 14 is supported with the housing 5 via a slide 17 which can be moved along a guide 19 by a feed drive 18. The hollow clamping head 14 is, however, penetrated by a perforated mandrel 20 which can be driven back and forth via an actuator 21 depending on the workpiece feed. The piercing tool 22 of the piercing mandrel 20, which projects into the area of the forging deformations of the workpiece 2 between the forging tools 1, has a tapering end 23 and a cylindrical calibration section 24 adjoining it, so that the punching and calibration are carried out in one operation can.
Um den Einstich des Lochwerkzeuges 22 in die einlaufseitige Stirnseite des Werkstücks 2 zu erleichtern und Rißbildungen am Beginn der Lochung zu vermeiden, wird das Werkstück 2 vor dem eigentlichen Lochvorgang mit einer zentrischen Vertiefung 25 versehen, die vor dem Einspannen des Werkstücks 2 gebohrt, aber auch nach dem Einspannen durch das Lochwerkzeug 22 selbst oder ein in die Maschinenmitte positionierbares spezielles Werkzeug hergestellt werden kann. Zum Lochen wird das Werkstück 2 in den Zeitspannen, in denen es von den Schmiedewerkzeugen 1 freigegeben wird, mit Hilfe des Vorschubantriebes 8 schrittweise durch die Schmiedeeinrichtung bewegt und gleichzeitig mit Hilfe des Drehantriebs 6 um einen vorgegebenen Winkelschritt um seine Achse gedreht. Die nach diesen Vorschubbewegungen über die SchmiedewerkzeugeIn order to facilitate the puncture of the punching tool 22 into the inlet-side end face of the workpiece 2 and to avoid cracking at the start of the punching, the workpiece 2 is provided with a central depression 25 before the actual punching process, which is drilled before the workpiece 2 is clamped, but also after clamping by the punch 22 itself or a special tool that can be positioned in the center of the machine. For punching, the workpiece 2 is moved step by step through the forging device by means of the feed drive 8 in the periods in which it is released by the forging tools 1 and at the same time rotated by a predetermined angular step about its axis with the aid of the rotary drive 6. The after these feed movements over the forging tools
1 durchgeführten Schmiedeverformungen bedingen im Kern des Werkstücks 2 Zugspannungen, die im Öffnungssinn auf den Kern wirken und die vom Lochwerkzeug 22 herrührenden Druckspannungen unterstützen, so daß die Lochung des Werkstücks 2 über den Lochdorn 20 mit einem vergleichsweise geringen Kraftaufwand vorgenommen werden kann. Um einen größeren Durchsatz sicherzustellen, wird der Lochdorn 20 während der Schmiedeverformung des Werkstücks 2 zwischen die Schmiedewerkzeuge 1 entgegen der Vorschubrichtung 3 des Werkstücks 2 vorgeschoben, wobei das Werkstück 2 mit einer entsprechenden Preßkraft in Vorschubrichtung 3 durch den Preßzylinder 12 beaufschlagt wird. Während der Vorschubbewegung des Werkstücks1 performed forging deformations in the core of the workpiece 2 tensile stresses, which act on the core in the direction of opening and support the compressive stresses originating from the piercing tool 22, so that the perforation of the workpiece 2 via the piercing mandrel 20 can be carried out with comparatively little effort. To ensure a higher throughput, the piercing mandrel 20 is advanced between the forging tools 1 against the feed direction 3 of the workpiece 2 during the forging deformation of the workpiece 2, the workpiece 2 being subjected to a corresponding pressing force in the feed direction 3 by the press cylinder 12. During the feed movement of the workpiece
2 zwischen den Schmiedeverformungen wird der Lochdorn 20 über den Stell- zylinder 21 synchron mit dem Vorschubantrieb 8 in seine Ausgangslage zurückgestellt, um bei der darauffolgenden Schmiedeverformung wieder entgegen der Vorschubrichtung 3 gegen das Werkstück 2 vorgeschoben zu werden. Wird das Werkstück 2 über seine gesamte axiale Erstreckung gelocht, so kann der Werkstückvorschub in axialer Richtung und in Umfangsrichtung nicht mehr durch den den Schmiedewerkzeugen 1 vorgelagerten Spannkopf 4 durchgeführt werden, sobald das diesem Spannkopf 4 zugeordnete Werkstückende bearbeitet wird. In diesem Fall übernimmt der gegenüberliegende Spannkopf 14 die Vorschubbewegungen sowohl in axialer als auch in Umfangsrichtung. Die Beaufschlagung des Werkstücks 2 über den Preßzylinder 12 des Spannkopfes 4 bleibt jedoch aufrecht. Der stirnseitige Anschlag 10 für das Werkstück 2 ist mit einer Aufnahmeöffnung 26 für das Lochwerkzeug 22 versehen, so daß die Werkstückabstützung über den Preßzylinder 12 durchgehend gesichert ist.2 between the forging deformations, the piercing mandrel 20 is returned to its starting position in synchronism with the feed drive 8 via the actuating cylinder 21, in order to be pushed against the workpiece 2 again against the feed direction 3 during the subsequent forging deformation. If the workpiece 2 is perforated over its entire axial extent, the workpiece feed in the axial direction and in the circumferential direction can no longer be carried out by the clamping head 4 upstream of the forging tools 1 as soon as the workpiece end assigned to this clamping head 4 is machined. In this case, the opposite clamping head 14 takes over the feed movements both in the axial and in the circumferential direction. The application of the workpiece 2 via the press cylinder 12 of the chuck 4 remains however. The end stop 10 for the workpiece 2 is provided with a receiving opening 26 for the punch 22, so that the workpiece support is continuously secured via the press cylinder 12.
Reicht die mit einem Durchmesser des Lochwerkzeuges 22 erreichbare Lochweite nicht aus, so kann das Werkstück 2 stufenweise bearbeitet werden. Eine solche Bearbeitung mit Hilfe eines Lochdorns 20, dessen Lochwerkzeug 22 zwei abgestufte Durchmesserabschnitte 27, 28 aufweist, ist in der Fig. 3 dargestellt. Nachdem das Werkstück 2 entsprechend dem kleineren Durchmesserabschnitt 27 gelocht wurde, wird die vorhandene Lochung mit Hilfe des größeren Durchmesserabschnittes 28 aufgeweitet, und zwar wiederum unter einer gleichzeitigen Schmiedeverformung, so daß die durch diese Schmiedeverformung wirksamen Zugspannungen vorteilhaft für den Lochvorgang genützt werden können. Um die Aufweitung der Lochung vorzunehmen, ist der Lochdorn 20 mittels des Stelltriebes 21 so zu verlagern, daß der Durchmesserabschnitt 28 des Lochwerkzeuges 22 im Bereich der Schmiedeverformungen des Werkstücks 2 durch die Schmiedewerkzeuge 1 zu liegen kommt.If the hole width achievable with a diameter of the punch tool 22 is not sufficient, the workpiece 2 can be machined in stages. A Such machining with the aid of a punch 20, the punch 22 having two stepped diameter sections 27, 28 is shown in FIG. 3. After the workpiece 2 has been punched in accordance with the smaller diameter section 27, the existing perforation is widened with the aid of the larger diameter section 28, again with simultaneous forging deformation, so that the tensile stresses effective through this forging deformation can be used advantageously for the punching process. In order to widen the perforation, the piercing mandrel 20 must be displaced by means of the actuator 21 such that the diameter section 28 of the perforating tool 22 comes to rest in the area of the forging deformations of the workpiece 2 by the forging tools 1.
Die Erfindung ist selbstverständlich nicht auf die dargestellten Ausführungsbeispiele beschränkt. Es kommt ja lediglich auf eine entsprechende axiale Beaufschlagung des Werkstücks während des Arbeitshubes des Lochdorns 20 an, wobei der Arbeitshub während der Schmiedeverformung durchgeführt wird. Die Schmiedeverformung kann durch Schmiedehämmer, aber auch durch Schmiedepressen erfolgen. Das Werkstück 2 kann außerdem in der geschilderten Weise sowohl warm-, halbwarm-, aber auch kaltverformt werden. In besonderen Fällen können außerdem die Schmiedewerkzeuge so angesteuert werden, daß sie nach einer Lochung des Werkstückes von einer kernlockernden auf eine gleichzeitige, kernverdichtende Schlagfolge umgeschaltet werden. Der Lochdorn 20 selbst kann undrehbar gehalten werden, sich aber auch mit dem Werkstück drehen oder zusätzlich gegenüber dem Werkstück drehend angetrieben werden. The invention is of course not limited to the exemplary embodiments shown. All that is required is a corresponding axial loading of the workpiece during the working stroke of the piercing mandrel 20, the working stroke being carried out during the forging deformation. The forging can be deformed by forging hammers, but also by forging presses. The workpiece 2 can also be hot, semi-hot, but also cold formed in the manner described. In special cases, the forging tools can also be controlled so that they are switched from a core-loosening to a simultaneous, core-compacting stroke sequence after perforating the workpiece. The piercing mandrel 20 itself can be kept non-rotatable, but can also rotate with the workpiece or can additionally be driven to rotate relative to the workpiece.

Claims

P a t e n t a n s p r ü c h e : Patent claims:
1. Verfahren zum Herstellen eines zylindrischen Hohlkörpers aus einem Rohling, wobei das Werkstück durch aufeinanderfolgende, gegeneinander um die Achse des Werkstücks winkelversetzte Schmiedeverformungen im Kernbereich geöffnet und zugleich auf einen Lochdorn aufgeschoben wird, dadurch gekennzeichnet, daß das Werkstück während der Schmiedeverformungen mit einer vorgebbaren Axialkraft gegen den entgegen dieser Axialkraft gegen das Werkstück vorschiebbaren Lochdorn gedrückt wird, der zwischen den aufeinanderfolgenden Schmiedeverformungen synchron mit dem axialen Vorschub des Werkstücks in seine Ausgangsstellung zurückbewegt wird.1. A method for producing a cylindrical hollow body from a blank, the workpiece being opened by successive forging deformations offset in relation to one another about the axis of the workpiece in the core region and at the same time being pushed onto a piercing mandrel, characterized in that the workpiece during the forging deformations with a predeterminable axial force is pressed against the punch which can be pushed against the workpiece against this axial force and which is moved back into its starting position between the successive forging deformations in synchronism with the axial feed of the workpiece.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Werkstück vor der Schmiedeverformung auf seiner dem Lochdorn zugekehrten Stirnseite mit einer zentrischen Vertiefung versehen wird.2. The method according to claim 1, characterized in that the workpiece is provided with a central recess on its face facing the piercing mandrel before the forging deformation.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Lochdurchmesser des Werkstücks in aufeinanderfolgenden Schritten jeweils unter einer Schmiedeverformung stufenweise vergrößert wird.3. The method according to claim 1 or 2, characterized in that the hole diameter of the workpiece is gradually increased in successive steps under a forging deformation.
4. Vorrichtung zur Durchführung des Verfahrens zum Herstellen eines zylindrischen Hohlkörpers nach einem der Ansprüche 1 bis 3 mit wenigstens zwei einander bezüglich des Werkstücks diametral gegenüberliegenden Schmiedewerkzeugen, mit einem den Schmiedewerkzeugen in Vorschubrichtung des Werkstücks vorgelagerten Spannkopf, der mit einem axialen Vorschubantrieb und einem Drehantrieb verbunden ist, und mit einem über einen Stelltrieb axial verlagerbaren Lochdorn, auf der dem vorgelagerten Spannkopf gegenüberliegenden Seite der Schmiedewerkzeuge, dadurch gekennzeichnet, daß der den Schmiedewerkzeugen (1) vorgelagerte Spannkopf (4) einen stirnseitigen Anschlag (10) für das Werkstück (2) sowie einen Preßzylinder (12) für das stirnseitig abgestützte Werkstück (2) aufweist und daß der Lochdorn (20) über seinen Stelltrieb (21) in Abhängigkeit vom Vorschubantrieb (8) des Spannkopfes (4) axial hin- und hergehend verschiebbar ist.4. Apparatus for carrying out the method for producing a cylindrical hollow body according to one of claims 1 to 3 with at least two forging tools diametrically opposite one another with respect to the workpiece, with a clamping head upstream of the forging tools in the feed direction of the workpiece, which is connected to an axial feed drive and a rotary drive is, and with a mandrel axially displaceable via an actuator, on the side of the forging tools opposite the upstream clamping head, characterized in that the clamping head (4) upstream of the forging tools (1) has an end stop (10) for the workpiece (2) and has a press cylinder (12) for the workpiece (2) supported on the end face and that the piercing mandrel (20) can be moved axially back and forth via its actuator (21) depending on the feed drive (8) of the clamping head (4).
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der Preßzylinder (12) dem Spannkopf (4) zugeordnet ist und den eine Aufnahmeöffnung (26) für den Lochdorn (20) bildenden, stirnseitigen Anschlag (10) für das Werkstück (2) beaufschlagt.5. The device according to claim 4, characterized in that the press cylinder (12) is assigned to the clamping head (4) and acts on the end stop (10) for the workpiece (2) which forms a receiving opening (26) for the piercing mandrel (20) ,
6. Vorrichtung nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß der Preßzylinder (12) mit einem Drehantrieb (13) für den stirnseitigen Anschlag (10) verbunden ist.6. Apparatus according to claim 4 or 5, characterized in that the press cylinder (12) is connected to a rotary drive (13) for the end stop (10).
7. Vorrichtung nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß der Lochdorn (20) ein Lochwerkzeug (22) mit abgestuften Durchmesserabschnitten (27, 28) aufweist.7. Device according to one of claims 4 to 6, characterized in that the piercing mandrel (20) has a piercing tool (22) with stepped diameter sections (27, 28).
8. Vorrichtung nach einem der Ansprüche 4 bis 7 mit einem den Schmiedewerkzeugen nachgeordneten, mit einem Vorschubantrieb für das Werkstück verbundenen, vom Lochdorn durchsetzten Spannkopf, dadurch gekennzeichnet, daß beide Spannköpfe (4, 14) mit einem Preßzylinder (12) zur stirnseitigen Beaufschlagung des Werkstücks (2) ausgerüstet sind und der Lochdorn (20) den Preßzylinder (12) des zugehörigen Spannkopfes (4, 14) durchsetzt.8. Device according to one of claims 4 to 7 with a downstream of the forging tools, connected to a feed drive for the workpiece, penetrated by the piercing mandrel, characterized in that both clamping heads (4, 14) with a press cylinder (12) for the frontal loading of the Workpiece (2) are equipped and the punch (20) passes through the press cylinder (12) of the associated clamping head (4, 14).
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß beiden Spannköpfen (4, 14) ein den zugehörigen Preßzylinder (12) durchsetzender Lochdorn (20) zugeordnet ist. 9. The device according to claim 8, characterized in that the two clamping heads (4, 14) is assigned an associated press cylinder (12) penetrating mandrel (20).
EP04802020A 2003-12-30 2004-12-28 Method and device for the production of a hollow cylinder from a blank Active EP1699580B1 (en)

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PCT/AT2004/000458 WO2005063421A1 (en) 2003-12-30 2004-12-28 Method and device for the production of a hollow cylinder from a blank

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AT501152A4 (en) 2006-07-15
AT501152B1 (en) 2006-07-15
ATE464960T1 (en) 2010-05-15
RU2347641C2 (en) 2009-02-27
EP1699580B1 (en) 2010-04-21
DE502004011081D1 (en) 2010-06-02
RU2006127418A (en) 2008-02-10
WO2005063421A1 (en) 2005-07-14
ES2343839T3 (en) 2010-08-11
US7434434B2 (en) 2008-10-14
AT501152B8 (en) 2007-02-15

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