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EP0829318B1 - Method for controlling the stroke frequency of a forging press and forging press for carrying out the method - Google Patents

Method for controlling the stroke frequency of a forging press and forging press for carrying out the method Download PDF

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Publication number
EP0829318B1
EP0829318B1 EP97890185A EP97890185A EP0829318B1 EP 0829318 B1 EP0829318 B1 EP 0829318B1 EP 97890185 A EP97890185 A EP 97890185A EP 97890185 A EP97890185 A EP 97890185A EP 0829318 B1 EP0829318 B1 EP 0829318B1
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EP
European Patent Office
Prior art keywords
drive
forging
ram
hydraulic
stroke
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP97890185A
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German (de)
French (fr)
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EP0829318A3 (en
EP0829318A2 (en
Inventor
Alfred Ing. Seeber
Rupert Ing. Wieser
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GFM Holding AG
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GFM Holding AG
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Publication of EP0829318A2 publication Critical patent/EP0829318A2/en
Publication of EP0829318A3 publication Critical patent/EP0829318A3/en
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Publication of EP0829318B1 publication Critical patent/EP0829318B1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J7/00Hammers; Forging machines with hammers or die jaws acting by impact
    • B21J7/02Special design or construction
    • B21J7/14Forging machines working with several hammers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J7/00Hammers; Forging machines with hammers or die jaws acting by impact
    • B21J7/20Drives for hammers; Transmission means therefor
    • B21J7/22Drives for hammers; Transmission means therefor for power hammers
    • B21J7/28Drives for hammers; Transmission means therefor for power hammers operated by hydraulic or liquid pressure

Definitions

  • the invention relates to a method for controlling the stroke frequency of a forging machine with a mechanical lifting drive for the lifting movement of a forging punch and a hydraulic drive connection between the linear actuator and Forging stamp and on a forging machine to carry out this process according to the preamble of claim 2 (see e.g. GB-A-1 572 780).
  • Such forging machines are available in different versions, with a lifting drive a crank or eccentric drive is used, the stroke movement of which is hydraulic Drive connection is transferred to the forging stamp, for which purpose, for example Lift drive actuates a piston pump, the pump chamber of which is hydraulically connected to the Forge stamp associated with the working cylinder.
  • These forging machines enable simple overload protection and high forming performance a stroke position adjustment by changing the hydraulic filling quantity in the hydraulic Drive connection.
  • the stroke numbers of the forging stamps have so far only been to control the mechanical drive, which is because of a reduction in speed occurring losses of kinetic energy only a very limited Control area allows.
  • the invention is therefore based on the object of a method of the aforementioned Specify the type with which the stroke frequency of the forging hammers is rational can be influenced.
  • a low-effort, compact Forging machine can be created to perform this process.
  • the invention solves this problem in that the speed of the linear actuator to high stroke frequency of the forging punch and to reduce the stroke frequency the hydraulic pressure of the drive connection at constant speed of the Linear actuator for periodically successive drive strokes to the extent of the drive-related Increasing is dismantled, while at the same time preferably the forge stamp is blocked in the top dead center area.
  • the control step remains the mechanical drive side of the stroke rate reduction of the forging die untouched, the drive speeds, which are responsible for the high stroke frequencies necessary can be maintained and there are no difficulties regarding the kinetic energy losses.
  • Forging machines with a hydraulic drive connection between the stroke drive and forging stamps are available in different constructions, with the execution the method only the drive connection via a depending on the Stroke actuated switching valve to be connected to a pressure accumulator needs. This means that when the switching valve is open, the hydraulic pressure during a Drive strokes do not increase to the extent required for a forging stroke, is forwarded to the pressure accumulator and only effective there, so that despite Drive stroke no forging stroke occurred.
  • a suitable blocking device the forging stamps are fixed in their top dead center position, what for mechanical interlocks are possible, but expediently hydraulic pads can be used as a movement lock, with greater functional reliability bring.
  • a low-effort design results if the drive connection is a drive-side one Pump piston and a piston-side working piston, which Engage pistons in a common hydraulic cylinder, preferably the Forging stamp by means of a hydraulic compression spring made of at least one on one Accumulator connected piston drive can be pressurized against the direction of action and the connecting line between the piston drive and the accumulator is a shut-off valve having.
  • This direct immersion of the pump piston and working piston in a common hydraulic cylinder additional hydraulic lines are unnecessary, what best hydraulic transmission conditions guaranteed.
  • the subject of the invention is, for example, based on a schematic Sectional illustration of a forging machine according to the invention illustrated in more detail.
  • a forging machine 1 has a forging punch 2, for which a mechanical Lift drive 3 and a hydraulic drive connection 4 between the lift drive 3 and forging stamp 2 are provided.
  • the hydraulic drive connection 4 exists thereby from a hydraulic cylinder 5, in the one hand facing away from the tool End part of the forging punch 2 as a working piston 6 and on the other hand as a plunger trained, operated via the linear actuator 3 pump piston 7.
  • the Lift drive 3 is an eccentric drive, the eccentric 8 of which is a rotatable sliding block 9 Conversion of the rotary movement into a lifting movement as a drive movement for the Pump piston 7 receives.
  • the forging punch 2 guided in a longitudinal guide 10 is pressurized via a compression spring 11 opposite to the effective direction, so that there is a corresponding return stroke after a working stroke and also against the hydraulic medium within the hydraulic cylinder 5 of the pump piston 7 the sliding block 9 is pressed and there is no positive connection to the drive connection Coupling by means of a backdrop or the like.
  • the compression spring 11 consists of two Piston drives 12, which are connected via a connecting line 13 to an accumulator 14 are, the connecting line 13 has a shut-off valve 15 which the Interruption of the line connection between piston drives 12 and accumulator 14 and thus a stroke layer blockage of the forging stamp 2 is permitted.
  • Switch valve 23 switched so that the connecting line 22 either to the hydraulic fluid supply device 18 or connected to the hydraulic fluid discharge device 19 and hydraulic fluid is pumped into or pumped out of the cylinder space 16 until the forging punch 2 reaches the desired stroke position is retracted.
  • the switching valve 23 is in its Locked position (position shown) so that the working strokes of the linear actuator 3 over the drive connection 4 with the same frequency on the working piston and thus the Forging stamp 2 is transmitted and the forging stamp 2 with the working frequency same stroke frequency works.
  • the switching valve 23 switches as required Moment the connecting line 22 with the pressure accumulator 20 briefly, whereby at a working stroke of the lifting drive 3 from the hydraulic fluid through the pump piston 7 the cylinder space 16 is conveyed via the connecting line 22 into the pressure accumulator 20 and the forging stamp 2 remains unused. In this case, too Shut-off valve 15 for the compression spring 11 closed and the forging stamp in the upper one Dead center area fixed. After one or more empty strokes then for the subsequent drive stroke, the switching valve 23 is switched back to the blocking position, so that the next stroke is transferred to the forging stamp 2 again is, also by operating the shut-off valve 15 and activation of the compression spring 11 is released again. It can be used independently of the mechanical linear actuator 3 vary the stroke frequency of the forging punch 2 within wide limits and at The use of several forging stamps can also influence the stroke sequence of the individual stamps.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Control Of Presses (AREA)

Description

Die Erfindung bezieht sich auf ein Verfahren zur Hubfrequenzsteuerung einer Schmiedemaschine mit einem mechanischen Hubantrieb für die Hubbewegung eines Schmiedestempels und einer hydraulischen Antriebsverbindung zwischen Hubantrieb und Schmiedestempel sowie auf eine Schmiedemaschine zur Durchführung dieses Verfahrens gemäß dem Oberbegriff des Anspruchs 2 (siehe z.B. GB-A-1 572 780).The invention relates to a method for controlling the stroke frequency of a forging machine with a mechanical lifting drive for the lifting movement of a forging punch and a hydraulic drive connection between the linear actuator and Forging stamp and on a forging machine to carry out this process according to the preamble of claim 2 (see e.g. GB-A-1 572 780).

Solche Schmiedemaschinen gibt es in verschiedenen Ausführungen, wobei als Hubantrieb ein Kurbel- oder Exzentertrieb dient, dessen Hubbewegung über eine hydraulische Antriebsverbindung auf den Schmiedestempel übertragen wird, wozu beispielsweise der Hubantrieb eine Kolbenpumpe betätigt, deren Pumpraum hydraulisch mit einem dem Schmiedestempel zugeordneten Arbeitszylinder in Verbindung steht. Diese Schmiedemaschinen ermöglichen bei hohen Umformleistungen einfache Überlastsicherungen und eine Hublagenverstellung durch Änderung der Hydraulikfüllmenge in der hydraulischen Antriebsverbindung. Allerdings sind bisher die Hubzahlen der Schmiedestempel lediglich über den mechanischen Antrieb zu steuem, was wegen der bei einer Drehzahlreduzierung auftretenden Verluste an kinetischer Energie nur einen recht beschränkten Steuerungsbereich zuläßt.Such forging machines are available in different versions, with a lifting drive a crank or eccentric drive is used, the stroke movement of which is hydraulic Drive connection is transferred to the forging stamp, for which purpose, for example Lift drive actuates a piston pump, the pump chamber of which is hydraulically connected to the Forge stamp associated with the working cylinder. These forging machines enable simple overload protection and high forming performance a stroke position adjustment by changing the hydraulic filling quantity in the hydraulic Drive connection. However, the stroke numbers of the forging stamps have so far only been to control the mechanical drive, which is because of a reduction in speed occurring losses of kinetic energy only a very limited Control area allows.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren der eingangs geschilderten Art anzugeben, mit dem auf rationelle Weise die Hubfrequenz der Schmiedehämmer beeinflußt werden kann. Darüber hinaus soll eine aufwandsarme, kompakte Schmiedemaschine zur Durchführung dieses Verfahrens geschaffen werden. The invention is therefore based on the object of a method of the aforementioned Specify the type with which the stroke frequency of the forging hammers is rational can be influenced. In addition, a low-effort, compact Forging machine can be created to perform this process.

Die Erfindung löst diese Aufgabe dadurch, daß die Drehzahl des Hubantriebes auf eine hohe Hubfrequenz des Schmiedestempels abgestimmt und zur Verringerung der Hubfrequenz der Hydraulikdruck der Antriebsverbindung bei gleichbleibender Drehzahl des Hubantriebes für periodisch aufeinanderfolgende Antriebshübe im Maße des antriebsbedingten Ansteigens abgebaut wird, während gleichzeitig vorzugsweise der Schmiedestempel im oberen Totpunktbereich blockiert wird. Durch diesen so einfachen wie eleganten Steuerungsschritt bleibt die mechanische Antriebsseite von der Hubzahlsenkung des Schmiedestempels unberührt, die Antriebsdrehzahlen, die für die hohen Hubfrequenzen notwendig sind, können beibehalten werden und es gibt keine Schwierigkeiten hinsichtlich der kinetischen Energieverluste. Auf der Seite der hydraulischen Antriebsverbindung braucht zur Senkung der Hubfrequenz nur im jeweils erforderlichen Rhythmus der Antriebshübe der sich aufbauende Arbeitsdruck abgebaut und unwirksam gemacht zu werden, und die Hubfrequenz des Schmiedestempels läßt sich entsprechend verringern. Ein durch den Druckabbau entstehender Leerhub bei jedem zweiten Antriebshub führt zu einer Halbierung der Hubfrequenz, Leerhübe bei jedem zweiten und dritten Antriebshub senkt die Frequenz auf ein Drittel bzw. ein Viertel usw.. Aus Sicherheitsgründen und zum Gewährleisten hoher Hubexaktheit kann gleichzeitig mit dem Druckabbau der Schmiedestempel im Bereich des oberen Totpunktes blockiert werden, so daß keine Fehlhübe oder Hublagenfehlstellungen auftreten. Zusätzlich zur Frequenzsteuerung kann mit diesem Verfahren bei einer Schmiedemaschine mit mehreren Schmiedestempeln auch die Hubfolge der einzelnen Schmiedestempel beeinflußt werden, so daß beispielsweise bei vier radial schmiedenden Stempeln einmal alle vier Stempel gleichzeitig wirken oder durch gegengleiche Leerhübe auch paarweise abwechselnd. Durch die Hubfrequenzsteuerung bleiben selbstverständlich alle Vorteile einer hydraulischen Antriebsverbindung unbeeinträchtigt und die meisten Sicherheitsund Regeleinrichtungen der Antriebsverbindung lassen sich auch steuerungstechnisch nützen.The invention solves this problem in that the speed of the linear actuator to high stroke frequency of the forging punch and to reduce the stroke frequency the hydraulic pressure of the drive connection at constant speed of the Linear actuator for periodically successive drive strokes to the extent of the drive-related Increasing is dismantled, while at the same time preferably the forge stamp is blocked in the top dead center area. With this simple and elegant The control step remains the mechanical drive side of the stroke rate reduction of the forging die untouched, the drive speeds, which are responsible for the high stroke frequencies necessary can be maintained and there are no difficulties regarding the kinetic energy losses. On the side of the hydraulic drive connection only needs to reduce the stroke frequency in the required rhythm the drive strokes the working pressure that builds up is reduced and rendered ineffective to be, and the stroke frequency of the forging die can be adjusted accordingly reduce. An idle stroke resulting from the pressure reduction on every second drive stroke leads to a halving of the stroke frequency, idle strokes at every second and third drive stroke reduces the frequency to a third or a quarter etc. For safety reasons and to ensure high stroke accuracy can simultaneously with the Pressure reduction of the forging stamps in the area of top dead center are blocked, so that there are no incorrect strokes or misalignments. In addition to frequency control can be used with this method in a forging machine with several Forging stamps can also influence the stroke sequence of the individual forging stamps, so that, for example, with four radially forging punches once every four The stamps work simultaneously or alternately in pairs due to opposite empty strokes. Of course, all advantages remain with the stroke frequency control a hydraulic drive connection unaffected and most safety and Control devices of the drive connection can also be used for control purposes good.

Schmiedemaschinen mit einer hydraulischen Antriebsverbindung zwischen Hubantrieb und Schmiedestempel gibt es in verschiedenen Konstruktionen, wobei zur Durchführung des Verfahrens lediglich die Antriebsverbindung über ein in Abhängigkeit von der Hubbewegung betätigbares Schaltventil an einen Druckspeicher angeschlossen zu werden braucht. Damit kann bei geöffnetem Schaltventil der Hydraulikdruck während eines Antriebshubes nicht in einem für einen Schmiedehub erforderlichen Maß ansteigen, sondem wird in den Druckspeicher weitergeleitet und erst dort wirksam, so daß trotz Antriebshub kein Schmiedehub erfolgt. Zusätzlich kann über eine geeignete Blockiervorrichtung der Schmiedestempel in seiner oberen Totpunktlage fixiert werden, wozu mechanische Verriegelungen möglich sind, doch zweckmäßigerweise Hydraulikpolster als Bewegungssperre eingesetzt werden, die eine größere Funktionssicherheit mit sich bringen. Beim Rückhub des Hubantriebes wird die aus der Antriebsverbindung in den Druckspeicher verdrängte Hydraulikmittelmenge wieder vom Druckspeicher in die Antriebsverbindung zurückgefördert, so daß ein Sperren des Schaltventils beim nächsten Antriebshub zu einer ordnungsgemäßen Antriebsverbindung zwischen Hubantrieb und Preßstempel führt und bei gelöster Hubblockade des Schmiedestempels auch dessen nächster Schmiedehub erfolgt.Forging machines with a hydraulic drive connection between the stroke drive and forging stamps are available in different constructions, with the execution the method only the drive connection via a depending on the Stroke actuated switching valve to be connected to a pressure accumulator needs. This means that when the switching valve is open, the hydraulic pressure during a Drive strokes do not increase to the extent required for a forging stroke, is forwarded to the pressure accumulator and only effective there, so that despite Drive stroke no forging stroke occurred. In addition, a suitable blocking device the forging stamps are fixed in their top dead center position, what for mechanical interlocks are possible, but expediently hydraulic pads can be used as a movement lock, with greater functional reliability bring. On the return stroke of the linear actuator, it is moved from the drive connection to the Pressure accumulator displaced quantity of hydraulic fluid again from the pressure accumulator into the drive connection conveyed back, so that the switching valve is blocked the next time Drive stroke to a proper drive connection between the stroke drive and Press ram leads and if the forging ram is released from the lifting blockage, this too next forging stroke takes place.

Eine aufwandsarme Konstruktion ergibt sich, wenn die Antriebsverbindung einen antriebsseitigen Pumpkolben und einen stempelseitigen Arbeitskolben umfaßt, welche Kolben in einen gemeinsamen Hydraulikzylinder eingreifen, wobei vorzugsweise der Schmiedestempel über eine hydraulische Druckfeder aus wenigstens einem an einem Akkumulator angeschlossenen Kolbentrieb entgegengesetzt zur Wirkrichtung druckbelastbar ist und die Anschlußleitung zwischen Kolbentrieb und Akkumulator ein Absperrventil aufweist. Durch dieses direkte Eintauchen von Pumpkolben und Arbeitskolben in einen gemeinsamen Hydraulikzylinder sind zusätzliche Hydraulikleitungen unnötig, was beste hydraulische Übertragungsbedingungen gewährleistet. Durch die Druckfederbelastung des Schmiedestempels braucht der Pumpkolben selbst nur für den Arbeitshub des Schmiedestempels zu sorgen, der Rückhub erfolgt über die Druckfeder, wobei diese Druckfeder gleichzeitig auch die Hubblockade des Arbeitskolbens bei einer Schlagfrequenzsenkung bewirken kann, indem einfach die Verbindung der Kolbentriebe zum Akkumulator unterbrochen wird.A low-effort design results if the drive connection is a drive-side one Pump piston and a piston-side working piston, which Engage pistons in a common hydraulic cylinder, preferably the Forging stamp by means of a hydraulic compression spring made of at least one on one Accumulator connected piston drive can be pressurized against the direction of action and the connecting line between the piston drive and the accumulator is a shut-off valve having. This direct immersion of the pump piston and working piston in a common hydraulic cylinder, additional hydraulic lines are unnecessary, what best hydraulic transmission conditions guaranteed. Due to the pressure spring load of the forging punch, the pump piston itself only needs for the working stroke to ensure the forging punch, the return stroke takes place via the compression spring, whereby this compression spring also blocks the stroke of the working piston at one Stroke frequency can be reduced simply by connecting the piston drives to the accumulator is interrupted.

Eine weitere konstruktive Verbesserung ergibt sich dadurch, daß als Hubantrieb ein Exzentertrieb vorgesehen ist, wobei ein auf dem Exzenter drehbar gelagerter Gleitstein Form- und/oder kraftschlüssig mit dem Pumpkolben in Verbindung steht und der werkzeugabgewandte Endteil des Schmiedestempels den Arbeitskolben bildet. Es kommt zu einer äußerst platzsparenden und kompakten Bauweise, die optimale Bedingungen auch für die hydraulische Antriebsverbindung mit sich bringt und eine von einer verhältnismäßig hohen maximalen Hubzahl ausgehende Hubfrequenzsteuerung in weiten Bereichen erlaubt.Another design improvement results from the fact that as a linear actuator Eccentric drive is provided, with a sliding block rotatably mounted on the eccentric Is positively and / or non-positively connected to the pump piston and the tool-facing End part of the forging stamp forms the working piston. It comes to an extremely space-saving and compact design, the optimal conditions also for the hydraulic drive connection and one of a proportionate high maximum number of strokes outgoing stroke frequency control in wide ranges allowed.

Besonders günstig ist es, wenn das Schaltventil und der Druckspeicher am Hydraulikzylinder bzw. an einem den Hydraulikzylinder aufnehmenden Gehäuse angebaut sind, da ein solcher Direktanbau Verbindungsleitungen unnötig macht und Kompressibilitätseinflüsse weitgehend ausgeschaltet sind.It is particularly favorable if the switching valve and the pressure accumulator on the hydraulic cylinder or are mounted on a housing receiving the hydraulic cylinder, since such a direct installation makes connecting lines unnecessary and influences on compressibility are largely turned off.

In der Zeichnung ist der Erfindungsgegenstand beispielsweise an Hand einer schematischen Schnittdarstellung einer erfindungsgemäßen Schmiedemaschine näher veranschaulicht.In the drawing, the subject of the invention is, for example, based on a schematic Sectional illustration of a forging machine according to the invention illustrated in more detail.

Eine Schmiedemaschine 1 weist einen Schmiedestempel 2 auf, für den ein mechanischer Hubantrieb 3 und eine hydraulische Antriebsverbindung 4 zwischen Hubantrieb 3 und Schmiedestempel 2 vorgesehen sind. Die hydraulische Antriebsverbindung 4 besteht dabei aus einem Hydraulikzylinder 5, in den einerseits der werkzeugabgewandte Endteil des Schmiedestempels 2 als Arbeitskolben 6 und anderseits ein als Tauchkolben ausgebildeter, über den Hubantrieb 3 betätigter Pumpkolben 7 eingreifen. Der Hubantrieb 3 ist ein Exzentertrieb, dessen Exzenter 8 einen drehbaren Gleitstein 9 zur Umwandlung der Drehbewegung in eine Hubbewegung als Antriebsbewegung für den Pumpkolben 7 aufnimmt. Der in einer Längsführung 10 geführte Schmiedestempel 2 wird über eine Druckfeder 11 entgegengesetzt zur Wirkrichtung druckbelastet, so daß es zu einem entsprechenden Rückhub nach einem Arbeitshub kommt und außerdem über das Hydraulikmittel innerhalb des Hydraulikzylinders 5 der Pumpkolben 7 gegen den Gleitstein 9 gedrückt wird und es zur Antriebsverbindung keiner formschlüssigen Koppelung mittels einer Kulisse od. dgl. bedarf. Die Druckfeder 11 besteht aus zwei Kolbentrieben 12, die über eine Anschlußleitung 13 an einen Akkumulator 14 angeschlossen sind, wobei die Anschlußleitung 13 ein Absperrventil 15 aufweist, das die Unterbrechung der Leitungsverbindung zwischen Kolbentrieben 12 und Akkumulator 14 und damit eine Hublagenblockade des Schmiedestempels 2 erlaubt.A forging machine 1 has a forging punch 2, for which a mechanical Lift drive 3 and a hydraulic drive connection 4 between the lift drive 3 and forging stamp 2 are provided. The hydraulic drive connection 4 exists thereby from a hydraulic cylinder 5, in the one hand facing away from the tool End part of the forging punch 2 as a working piston 6 and on the other hand as a plunger trained, operated via the linear actuator 3 pump piston 7. The Lift drive 3 is an eccentric drive, the eccentric 8 of which is a rotatable sliding block 9 Conversion of the rotary movement into a lifting movement as a drive movement for the Pump piston 7 receives. The forging punch 2 guided in a longitudinal guide 10 is pressurized via a compression spring 11 opposite to the effective direction, so that there is a corresponding return stroke after a working stroke and also against the hydraulic medium within the hydraulic cylinder 5 of the pump piston 7 the sliding block 9 is pressed and there is no positive connection to the drive connection Coupling by means of a backdrop or the like. Requires. The compression spring 11 consists of two Piston drives 12, which are connected via a connecting line 13 to an accumulator 14 are, the connecting line 13 has a shut-off valve 15 which the Interruption of the line connection between piston drives 12 and accumulator 14 and thus a stroke layer blockage of the forging stamp 2 is permitted.

Zur Steuerung der Hubfrequenz unabhängig von der Exzenterdrehzahl des Hubantriebes 3 und auch zur Hublagenverstellung des Schmiedestempel 2 ist der Zylinderraum 16 des Hydraulikzylinders 5 an eine nur angedeutete Hydraulikmittelversorgungsanlage 17 angeschlossen, die neben nicht weiter dargestellten Sicherheits-, Leckölverlust- und Temperaturausgleichseinrichtungen u. dgl. eine Hydraulikmittelzu- und -abfuhreinrichtung 18, 19 sowie eine Druckspeichereinrichtung 20 umfaßt, wobei die Hydraulikmittelversorgungsanlage 17 direkt an einem gemeinsamen Gehäuse 21 für Preßstempel, Hubantrieb und Antriebsverbindung angeflanscht ist und als Verbindungsleitung eine Gehäusebohrung 22 genügt Diese Gehäusebohrung 22 kann über ein mehrwegiges Schaltventil 23 wahlweise mit der einen oder anderen Einrichtung verbunden werden.To control the stroke frequency regardless of the eccentric speed of the stroke drive 3 and also for adjusting the stroke position of the forging punch 2 is the cylinder space 16 of the hydraulic cylinder 5 to an only indicated hydraulic medium supply system 17 connected, in addition to not shown security, leakage and Temperature compensation devices u. The like. A hydraulic fluid supply and discharge device 18, 19 and a pressure storage device 20, wherein the hydraulic fluid supply system 17 directly on a common housing 21 for press rams, Hubantrieb and drive connection is flanged and as a connecting line Housing bore 22 is sufficient This housing bore 22 can be a multi-way Switch valve 23 can be optionally connected to one or the other device.

Soll beispielsweise die Hublage des Schmiedestempels 2 verändert werden, wird das Schaltventil 23 so geschaltet, daß die Verbindungsleitung 22 entweder an die Hydraulikmittelzufuhreinrichtung 18 oder an die Hydraulikmittelabfuhreinrichtung 19 angeschlossen ist und Hydraulikmittel in den Zylinderraum 16 eingepumpt oder aus ihm abgepumpt werden kann, bis der Schmiedestempel 2 bis zur gewünschten Hublage ausoder eingefahren ist. Beim üblichen Schmiedevorgang ist das Schaltventil 23 in seiner Sperrstellung (dargestellte Stellung), so daß die Arbeitshübe des Hubantriebes 3 über die Antriebsverbindung 4 mit gleicher Frequenz auf den Arbeitskolben und damit den Schmiedestempel 2 übertragen wird und der Schmiedestempel 2 mit zur Arbeitsfrequenz gleicher Hubfrequenz arbeitet.If, for example, the stroke position of the forging punch 2 is to be changed, this will be Switch valve 23 switched so that the connecting line 22 either to the hydraulic fluid supply device 18 or connected to the hydraulic fluid discharge device 19 and hydraulic fluid is pumped into or pumped out of the cylinder space 16 until the forging punch 2 reaches the desired stroke position is retracted. In the usual forging process, the switching valve 23 is in its Locked position (position shown) so that the working strokes of the linear actuator 3 over the drive connection 4 with the same frequency on the working piston and thus the Forging stamp 2 is transmitted and the forging stamp 2 with the working frequency same stroke frequency works.

Soll die Hubfrequenz reduziert werden, schaltet das Schaltventil 23 im erforderlichen Augenblick die Verbindungsleitung 22 mit dem Druckspeicher 20 kurz, wodurch bei einem Arbeitshub des Hubantriebes 3 das Hydraulikmittel durch den Pumpkolben 7 aus dem Zylinderraum 16 über die Verbindungsleitung 22 in den Druckspeicher 20 befördert wird und der Schmiedestempel 2 unbeaufschlagt bleibt. In diesem Fall wird auch das Absperrventil 15 für die Druckfeder 11 geschlossen und der Schmiedestempel im oberen Totpunktbereich lagefixiert. Nach einem oder auch mehreren Leerhüben wird dann für den nachfolgenden Antriebshub das Schaltventil 23 wieder in die Sperrstellung geschaltet, so daß der nächste Arbeitshub erneut auf den Schmiedestempel 2 übertragen wird, der ebenfalls durch Betätigung des Absperrventils 15 und Aktivierung der Druckfeder 11 wieder freigegeben ist. Damit läßt sich unabhängig vom mechanischen Hubantrieb 3 die Hubfrequenz des Schmiedestempel 2 in weiten Grenzen variieren und beim Einsatz mehrerer Schmiedestempel auch die Hubfolge der einzelnen Stempel beeinflussen.If the stroke frequency is to be reduced, the switching valve 23 switches as required Moment the connecting line 22 with the pressure accumulator 20 briefly, whereby at a working stroke of the lifting drive 3 from the hydraulic fluid through the pump piston 7 the cylinder space 16 is conveyed via the connecting line 22 into the pressure accumulator 20 and the forging stamp 2 remains unused. In this case, too Shut-off valve 15 for the compression spring 11 closed and the forging stamp in the upper one Dead center area fixed. After one or more empty strokes then for the subsequent drive stroke, the switching valve 23 is switched back to the blocking position, so that the next stroke is transferred to the forging stamp 2 again is, also by operating the shut-off valve 15 and activation of the compression spring 11 is released again. It can be used independently of the mechanical linear actuator 3 vary the stroke frequency of the forging punch 2 within wide limits and at The use of several forging stamps can also influence the stroke sequence of the individual stamps.

Claims (5)

  1. A method of controlling the reciprocation frequency of a forging machine (1) with a mechanical reciprocating drive (3) for the reciprocating movement of a forging ram (2) and a hydraulic drive connection (4) between the reciprocating drive (3) and the forging ram (2), wherein the speed of the reciprocating drive is set to a high reciprocation frequency of the forging ram and for the purpose of reducing the reciprocation frequency, for periodically consecutive drive strokes, at a constant speed of the reciprocating drive, the hydraulic pressure of the drive connection is reduced in proportion to the increase required by the drive, while at the same time the forging ram is preferably blocked in the top dead centre zone.
  2. A forging machine for performing the method according to claim 1, with at least one longitudinally guided forging ram and an associated mechanical reciprocating drive and a hydraulic drive connection between the reciprocating drive and the ram, characterised in that the drive connection (4) is connected to a pressure tank (20) via an actuating valve (23) which is adapted to be operated in dependence on the reciprocation movement.
  3. A forging machine according to claim 2, characterised in that the drive connection (4) comprises a pump piston (7) on the drive side and a working piston (6) on the ram side, which pistons engage in a hydraulic cylinder (5), the forging ram (2) preferably being adapted to be loaded with pressure in opposition to the direction of action via a hydraulic compression spring (11) from at least one piston drive (12) connected to an accumulator (14), and the connecting line (13) between the piston drive (12) and the accumulator (14) comprises a shut-off valve (15).
  4. A forging machine according to claim 3, characterised in that the reciprocating drive is an eccentric drive (3), a sliding block (10) mounted for rotation on the eccentric (9) being positively and/or non-positively connected to the pump piston (7) and the end part of the forging ram (2) remote from the tool forms the working piston (6).
  5. A forging machine according to claim 3, characterised in that the actuating valve (23) and the pressure tank (20) are built on to the hydraulic cylinder or on to a housing (21) receiving the hydraulic cylinder (5).
EP97890185A 1996-09-17 1997-09-16 Method for controlling the stroke frequency of a forging press and forging press for carrying out the method Expired - Lifetime EP0829318B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0164096A AT404440B (en) 1996-09-17 1996-09-17 METHOD FOR CONTROLLING THE STROKE FREQUENCY OF A FORGING MACHINE AND FORGING MACHINE FOR CARRYING OUT THE METHOD
AT1640/96 1996-09-17
AT164096 1996-09-17

Publications (3)

Publication Number Publication Date
EP0829318A2 EP0829318A2 (en) 1998-03-18
EP0829318A3 EP0829318A3 (en) 2000-06-07
EP0829318B1 true EP0829318B1 (en) 2002-08-28

Family

ID=3517791

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97890185A Expired - Lifetime EP0829318B1 (en) 1996-09-17 1997-09-16 Method for controlling the stroke frequency of a forging press and forging press for carrying out the method

Country Status (5)

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US (1) US5857378A (en)
EP (1) EP0829318B1 (en)
JP (1) JPH10146639A (en)
AT (1) AT404440B (en)
DE (1) DE59708049D1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT407617B (en) * 1999-10-07 2001-05-25 Gfm Beteiligungs & Man Gmbh FORGING MACHINE
AT519527B1 (en) * 2016-12-22 2018-10-15 Gfm Gmbh forge
CN106623719B (en) * 2017-02-24 2019-04-26 王安基 Forging mechanism and forging machine
CN109751289B (en) * 2019-01-21 2020-07-03 太原理工大学 Hydraulic system of hydraulic hybrid radial forging machine

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1812169A1 (en) * 1968-12-02 1970-06-18 Sack Gmbh Maschf Forging machine
US3783672A (en) * 1972-02-23 1974-01-08 A Morgolenko High-speed machines for shaping metals which employ the energy of high-pressure gas
SU479554A1 (en) * 1973-01-17 1975-08-05 Рязанский Завод Тяжелого Кузнечнопрессового Оборудования Radial forging machine
JPS53105775A (en) * 1977-02-26 1978-09-14 Kawasaki Yuko Kk Forging press
US4148209A (en) * 1978-04-07 1979-04-10 Kawasaki Yukoh Kabushiki Kaisha Forging press
US4321818A (en) * 1979-10-03 1982-03-30 Kawaski Yukon Kabushiki Kaisha Closed forging press
DD279639A1 (en) * 1989-01-27 1990-06-13 Warnke Umformtech Veb K DRIVE FOR MECHANICAL PRESSES
DE4232728C2 (en) * 1992-09-30 1998-01-29 Pahnke Eng Gmbh & Co Kg Forming machine with press cylinder with two assigned piston pumps
DE4444498A1 (en) * 1993-12-16 1995-06-22 Hasenclever Maschf Sms Forging machine
JP3251135B2 (en) * 1994-09-30 2002-01-28 株式会社放電精密加工研究所 Progressive processing equipment

Also Published As

Publication number Publication date
EP0829318A3 (en) 2000-06-07
JPH10146639A (en) 1998-06-02
DE59708049D1 (en) 2002-10-02
AT404440B (en) 1998-11-25
US5857378A (en) 1999-01-12
EP0829318A2 (en) 1998-03-18
ATA164096A (en) 1998-04-15

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