EP2361700A1 - Extrusion press for manufacturing sections from non-ferrous metals - Google Patents

Extrusion press for manufacturing sections from non-ferrous metals Download PDF

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Publication number
EP2361700A1
EP2361700A1 EP11000975A EP11000975A EP2361700A1 EP 2361700 A1 EP2361700 A1 EP 2361700A1 EP 11000975 A EP11000975 A EP 11000975A EP 11000975 A EP11000975 A EP 11000975A EP 2361700 A1 EP2361700 A1 EP 2361700A1
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EP
European Patent Office
Prior art keywords
electric motor
extruder according
pump
phase
hydraulic piston
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Granted
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EP11000975A
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German (de)
French (fr)
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EP2361700B1 (en
Inventor
Dirk Adolphy
Georg Glass
Peter Heinen
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SMS Group GmbH
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SMS Meer GmbH
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Publication of EP2361700A1 publication Critical patent/EP2361700A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/21—Presses specially adapted for extruding metal
    • B21C23/211—Press driving devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C31/00—Control devices, e.g. for regulating the pressing speed or temperature of metal; Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses

Definitions

  • the invention relates to an extruder for producing profiles of non-ferrous metal, wherein the extruder has at least one ram, which is driven by at least one hydraulic piston-cylinder system, wherein the at least one hydraulic piston-cylinder system supplied by at least one pump with hydraulic fluid and wherein the at least one pump is driven by an electric motor which is in communication with a three-phase network.
  • a generic extruder is from the EP 2 000 226 B1 known.
  • a three-phase asynchronous motor is used to drive the pump.
  • star-delta circuit For gently starting such high-performance motors, in particular three-phase motors, it is known that these are formed with a star-delta circuit.
  • the star-delta circuit is used to limit the starting current of an asynchronous motor in delta connection. The motor is brought to speed in the star connection. When switching is then theoretically only the delta current needed, which corresponds to the current speed. Thus, the inrush current is reduced to 1/3 of the current in the case of delta direct turn-on.
  • the mains phases and motor field may be in opposition to stand by each other. This leads to compensation processes, which can disadvantageously lead to a very high switching current peak.
  • the invention is therefore the object of a generic extruder in such a way that on the one hand it is possible to achieve a smooth start of the system, on the other hand in operation but then also to drive an energy-efficient operation and in particular the motors for driving the pump only in the To operate dimensions as required by the pressing process.
  • At least two thyristors or bidirectional thyristor triodes are provided to cut at least two of the three phases of the AC voltage.
  • the electric motor is in particular an asynchronous motor.
  • a pump can supply two or more hydraulic piston-cylinder systems with hydraulic fluid. But it is also possible that several pumps supply via communicating fluid lines at least one hydraulic piston-cylinder system with hydraulic fluid. In the latter case it can be provided that supply the number of pumps via the communicating fluid lines at least two hydraulic piston-cylinder systems with hydraulic fluid.
  • thyristors or triacs are preferably provided, which make the phase angle of the voltage and control.
  • the thyristors or triacs reduce the voltage when switched on by means of a phase control. Subsequently, the phase control can be reduced until the full mains voltage is reached.
  • the electronics can be bridged by means of a relay or a contactor to reduce the power loss. As a result, a start under nominal load is possible.
  • variable pump shut-off rules out that pumps only produce waste heat.
  • the related risk increases without the use of the invention to the extent the greater the number of unneeded pumps during pressing.
  • the embodiment of the invention is characterized by a simple technique that is mature available.
  • the pumps not required in the pressing process can be switched off in a simple manner. This can be done in particular from pressing times of more than 90 seconds, which - as stated - corresponds to a large part of the production. Even short cycles are energy-efficient mobile.
  • the Fig. 1 shows a press ram 1 of an extruder for producing profiles of non-ferrous metal, which is actuated by two hydraulic piston-cylinder systems 2 (see the direction of the double arrow in Fig. 1 ).
  • the hydraulic piston-cylinder systems 2 receive pressurized hydraulic fluid from a pump 3 via a fluid line 8.
  • the pump 3 in turn is driven by an electric motor 4.
  • the electric motor 4 is electrically connected to a three-phase network 5, which has the three phases L 1 , L 2 and L 3 . Between the three-phase network 5 and the Electric motor 4, a motor controller (electronic circuit) is arranged, which is referred to as means 6 for soft start.
  • a motor controller electronic circuit
  • the means 6 for soft start are in Fig. 2 shown in more detail.
  • the means 6 comprise for two phases - namely for the phases L1 and L3 - depending on a bidirectional thyristor triode 7.
  • the operation of the bidirectional thyristor triode 7 is in the FIGS. 3a to 3c played.
  • Fig. 3a the uninfluenced sinusoidal curve of the voltage U of a phase over time t is sketched. This voltage curve corresponds to the full network performance and is supplied to the electric motor 4 when the engine is running and should bring full power.
  • the phase of the voltage waveform U is cut. Accordingly, the power is transmitted from the mains to the electric motor 4 only when the bidirectional thyristor triode 7 is "ignited".
  • the times t, to which this takes place periodically, are indicated by the arrows 9 - symbolizing the ignition - in Fig. 3b and 3c specified. Only the solid areas of the voltage curve thus ensure that the electric motor 4 energy is supplied from the three-phase network 5.
  • the dashed curves indicate the time range over which - in the absence of ignition which has not yet occurred - no energy is supplied to the electric motor 4.
  • FIGS. 3b and 3c show that depending on the ignition timing more or less energy is passed from the three-phase system to the electric motor. In the situation, how they look Fig. 3b results, it is more energy than in the case of the later ignition according to Fig. 3c ,
  • Fig. 4 It can be seen that three electric motors 4 operate in parallel in order to supply two hydraulic piston-cylinder systems 2 connected in parallel with pressurized fluid via a fluid line 8.
  • FIG. 3 shows three pumps 3 associated with the piston-cylinder systems 2, each electric motor 4 of each pump 3 being provided with means 6 for soft starting and the two lower pumps being switched off as required.
  • Fig. 5 is shown - but only very schematically - that between an upper state (“pump X on”) and a lower state (“pump X off”) can also be acted upon by the means 6 for soft start to either start the electric motor or shut down.
  • the pumps can be operated as needed. For example, they only start to block change or depending on the press speed that is to be achieved.
  • the retrofitting of the proposed system according to the invention is simple, since the electric motor or frequency converter does not have to be FU-suitable. Power cables can be used without screen. Furthermore, there is only a small amount of space in the control cabinet.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Motor And Converter Starters (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Extrusion Of Metal (AREA)
  • Control Of Ac Motors In General (AREA)
  • Control Of Presses (AREA)

Abstract

The extrusion press has an extrusion die (1), which is driven by a hydraulic piston-cylinder system (2). The hydraulic piston-cylinder system is supplied with hydraulic fluid by a pump (3). The pump is driven by an electric motor (4), which stays in connection with a three-phase system (5). The electric motor is provided with units (6) for smooth start.

Description

Die Erfindung betrifft eine Strangpresse zum Herstellen von Profilen aus Nichteisenmetall, wobei die Strangpresse mindestens einen Pressstempel aufweist, der durch mindestens ein hydraulisches Kolben-Zylinder-System angetrieben wird, wobei das mindestens eine hydraulische Kolben-Zylinder-System von mindestens einer Pumpe mit Hydraulikfluid versorgt wird und wobei die mindestens eine Pumpe von einem Elektromotor angetrieben wird, der mit einem Drehstromnetz in Verbindung steht.The invention relates to an extruder for producing profiles of non-ferrous metal, wherein the extruder has at least one ram, which is driven by at least one hydraulic piston-cylinder system, wherein the at least one hydraulic piston-cylinder system supplied by at least one pump with hydraulic fluid and wherein the at least one pump is driven by an electric motor which is in communication with a three-phase network.

Eine gattungsgemäße Strangpresse ist aus der EP 2 000 226 B1 bekannt. Hier wird zum Antrieb der Pumpe ein Dreiphasen-Asynchronmotor eingesetzt.A generic extruder is from the EP 2 000 226 B1 known. Here, a three-phase asynchronous motor is used to drive the pump.

Zum sanften Anfahren derartiger leistungsstarker Motoren, wie insbesondere Drehstrommotoren, ist es bekannt, dass diese mit einer Stern-Dreieck-Schaltung ausgebildet sind. Die Stern-Dreieck-Schaltung wird eingesetzt, um den Anlaufstrom eines Asynchronmotors in Dreieckschaltung zu begrenzen. Dabei wird der Motor in der Sternschaltung auf Drehzahl gebracht. Beim Umschalten wird dann theoretisch nur noch der Dreieckstrom benötigt, der der aktuellen Drehzahl entspricht. Somit wird der Einschaltstrom auf 1/3 gegenüber dem Strom bei Dreieck-Direkteinschaltung reduziert. Jedoch können beim Umschalten von Stern- auf Dreieck-Schaltung die Netzphasen und das Motorfeld in Opposition zueinander stehen. Dies führt zu Ausgleichsvorgängen, was nachteilig zu einer sehr hohen Umschaltstromspitze führen kann.For gently starting such high-performance motors, in particular three-phase motors, it is known that these are formed with a star-delta circuit. The star-delta circuit is used to limit the starting current of an asynchronous motor in delta connection. The motor is brought to speed in the star connection. When switching is then theoretically only the delta current needed, which corresponds to the current speed. Thus, the inrush current is reduced to 1/3 of the current in the case of delta direct turn-on. However, when switching from star to delta, the mains phases and motor field may be in opposition to stand by each other. This leads to compensation processes, which can disadvantageously lead to a very high switching current peak.

Insbesondere ist es beim Einsatz der Stern-Dreieck-Umschaltung und beim Einsatz eines FU-Schalters nicht bzw. nur bedingt möglich, eine zyklische Pumpenschaltung energieeffizient zu fahren.In particular, when using the star-delta switchover and when using a FU switch, it is not possible, or only possible to a limited extent, to drive a cyclic pump circuit in an energy-efficient manner.

Wie bei in die Motorsteuerung integrierten Fehlerspannungsschutzschaltern (FU-Schaltern) ist ein häufiges Abschalten mit Problemen behaftet oder sogar unmöglich. Abhilfe wird geschaffen, indem die Motoren nicht abgeschaltet werden und die nicht benötigten Pumpen permanent durchlaufen.As with fault-voltage circuit breakers (FU switches) integrated into the motor control, frequent shutdowns are problematic or even impossible. Remedy is created by the engines are not turned off and go through the unneeded pumps permanently.

Dies hat energetische Nachteile zur Folge, da die Pumpen stärker betrieben werden, als es für die Durchführung der Pressprozesse nötig wäre.This has energy disadvantages result, since the pumps are operated more than would be necessary for the execution of the pressing processes.

Der Erfindung liegt daher die Aufgabe zugrunde, eine gattungsgemäße Strangpresse so auszubilden, dass es einerseits möglich wird, einen problemlosen Anlauf des Systems zu erreichen, andererseits im Betrieb dann aber auch eine energieeffiziente Betriebsweise zu fahren und insbesondere die Motoren zum Antrieb der Pumpe nur in dem Maße zu betreiben, wie es der Pressprozess erfordert.The invention is therefore the object of a generic extruder in such a way that on the one hand it is possible to achieve a smooth start of the system, on the other hand in operation but then also to drive an energy-efficient operation and in particular the motors for driving the pump only in the To operate dimensions as required by the pressing process.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass der Elektromotor mit Mitteln zum Sanftstart versehen ist.This object is achieved in that the electric motor is provided with means for soft start.

Nach einer bevorzugten Ausführung sind mindestens zwei Thyristoren oder Zweirichtungs-Thyristortrioden vorhanden, um mindestens zwei der drei Phasen der Wechselspannung anzuschneiden. Vorgesehen werden können aber auch drei Thyristoren oder Zweirichtungs-Thyristortrioden, um alle drei Phasen der Wechselspannung anzuschneiden.According to a preferred embodiment, at least two thyristors or bidirectional thyristor triodes are provided to cut at least two of the three phases of the AC voltage. However, it is also possible to provide three thyristors or bidirectional thyristor triodes in order to cut all three phases of the alternating voltage.

Der Elektromotor ist insbesondere ein Asynchronmotor.The electric motor is in particular an asynchronous motor.

Eine Pumpe kann zwei oder mehr hydraulische Kolben-Zylinder-Systeme mit Hydraulikfluid versorgen. Möglich ist es aber auch, dass mehrere Pumpen über kommunizierende Fluidleitungen mindestens ein hydraulisches Kolben-Zylinder-System mit Hydraulikfluid versorgen. In letzterem Falle kann vorgesehen werden, dass die Anzahl von Pumpen über die kommunizierenden Fluidleitungen mindestens zwei hydraulische Kolben-Zylinder-Systeme mit Hydraulikfluid versorgen.A pump can supply two or more hydraulic piston-cylinder systems with hydraulic fluid. But it is also possible that several pumps supply via communicating fluid lines at least one hydraulic piston-cylinder system with hydraulic fluid. In the latter case it can be provided that supply the number of pumps via the communicating fluid lines at least two hydraulic piston-cylinder systems with hydraulic fluid.

Generell werden mit dem erfindungsgemäß zum Einsatz kommenden Sanftanlauf Maßnahmen zur Leistungsbegrenzung beim Einschalten eines elektrischen Gerätes beschrieben, vorliegend eines elektrischen Motors. Hierbei wird zum einen der Einschaltstrom des Gerätes verringert, d. h. es erfolgt eine Einschaltstrombegrenzung. Es wird damit auch das Ansprechen eines Leitungsschutzschalters oder ein starker Spannungseinbruch der Netzspannung vermieden. Zum anderen werden die vom Elektromotor angetriebenen Komponenten vor zu großen Drehmomenten und Beschleunigungen geschützt.Generally, with the soft start used according to the invention, measures for limiting the power when switching on an electrical device are described, in this case an electric motor. In this case, on the one hand, the inrush current of the device is reduced, d. H. there is an inrush current limit. It is thus avoided the response of a circuit breaker or a strong voltage dip of the mains voltage. On the other hand, the components driven by the electric motor are protected against excessive torque and acceleration.

Zur Einschaltstrombegrenzung wird bevorzugt der Einsatz von Thyristoren oder Triacs vorgesehen, die den Phasenanschnitt der Spannung vornehmen und steuern. Die Thyristoren bzw. Triacs verringern beim Einschalten mittels eines Phasenanschnitts die Spannung. Anschließend kann der Phasenanschnitt reduziert werden, bis die volle Netzspannung erreicht ist. Beim Erreichen der vollen Spannung kann die Elektronik mittels eines Relais bzw. eines Schützes überbrückt werden, um die Verlustleistung zu verringern. Hierdurch wird auch ein Anlaufen unter Nennlast möglich.For Einschaltstrombegrenzung the use of thyristors or triacs is preferably provided, which make the phase angle of the voltage and control. The thyristors or triacs reduce the voltage when switched on by means of a phase control. Subsequently, the phase control can be reduced until the full mains voltage is reached. When reaching the full voltage, the electronics can be bridged by means of a relay or a contactor to reduce the power loss. As a result, a start under nominal load is possible.

Der problematische Anlauf des Systems und ein womöglich zu hoher Energieverbrauch lassen sich erfindungsgemäß also dadurch vermeiden, dass die Motorsteuerung mit einem Sanftstarter ausgerüstet wird. So lässt sich in einfacher Weise erreichen, dass nicht benötigte Antriebe zu den Pumpen in kurzen Zyklen abgeschaltet und wieder eingeschaltet werden können. Hierbei ist zu beachten, dass bei einem Großteil der normalen Produktion die Presszeiten über 90 Sekunden liegen. Mit der vorgeschlagenen Lösung ist es ohne hohe Lastspitzen und energieeffizient möglich, beliebige Lastspiele zu fahren, wobei die Pumpen auch versetzt eingeschaltet werden können.The problematic startup of the system and possibly high energy consumption can therefore be avoided according to the invention by equipping the motor control with a soft starter. This makes it easy to achieve that unneeded drives to the pumps can be switched off in short cycles and switched on again. It should be noted that for most of the normal production, the press times are over 90 seconds. With the proposed solution, it is possible without high peak loads and energy efficient to drive any load cycles, the pumps can also be switched off.

Somit ergibt sich ein hohes Energie-Einsparpotential für die Zeiten, in denen die Antriebe abgeschaltet worden sind, das mit der Erfindung genutzt werden kann.This results in a high energy-saving potential for the times in which the drives have been switched off, which can be used with the invention.

Die variable Pumpenabschaltung schließt aus, dass Pumpen nur Abwärme produzieren. Die diesbezügliche Gefahr steigt ohne Einsatz der Erfindung in dem Maße, je größer die Anzahl nicht benötigter Pumpen beim Pressen ist.The variable pump shut-off rules out that pumps only produce waste heat. The related risk increases without the use of the invention to the extent the greater the number of unneeded pumps during pressing.

Die erfindungsgemäße Ausgestaltung zeichnet sich durch eine einfache Technik aus, die ausgereift zur Verfügung steht.The embodiment of the invention is characterized by a simple technique that is mature available.

Die beim Pressvorgang nicht benötigten Pumpen können in einfacher Weise abgeschaltet werden. Dies kann insbesondere ab Presszeiten von mehr als 90 Sekunden erfolgen, was - wie gesagt - einem Großteil der Produktion entspricht. Auch kurze Zyklen sind energieeffizient fahrbar.The pumps not required in the pressing process can be switched off in a simple manner. This can be done in particular from pressing times of more than 90 seconds, which - as stated - corresponds to a large part of the production. Even short cycles are energy-efficient mobile.

In der Zeichnung sind Ausführungsbeispiele der Erfindung schematisch dargestellt. Es zeigen:

Fig.1
schematisch den Antrieb einer Strangpresse zum Herstellen von Profilen aus Nichteisenmetall gemäß einer ersten Ausführungsform der Erfindung;
Fig. 2
den Elektromotor des Antriebs gemäß Fig. 1;
Fig. 3a
den Verlauf der Spannung einer Phase eines Drehstromnetzes über der Zeit;
Fig. 3b
den phasenangeschnittenen Verlauf der Phase gemäß Fig. 3a;
Fig. 3c
den noch stärker phasenangeschnittenen Verlauf der Phase gemäß Fig. 3a;
Fig. 4
schematisch den Antrieb einer Strangpresse zum Herstellen von Profilen aus Nichteisenmetall gemäß einer zweiten Ausführungsform der Erfindung; und
Fig. 5
schematisch ein Schaubild einer Pumpenabschaltung mit einem Sanftstarter.
In the drawings, embodiments of the invention are shown schematically. Show it:
Fig.1
schematically the drive of an extruder for producing profiles of non-ferrous metal according to a first embodiment of the invention;
Fig. 2
the electric motor of the drive according to Fig. 1 ;
Fig. 3a
the course of the voltage of a phase of a three-phase network over time;
Fig. 3b
the phase-cut course of the phase according to Fig. 3a ;
Fig. 3c
the more phase-phase course of the phase according to Fig. 3a ;
Fig. 4
schematically the drive of an extruder for producing profiles of non-ferrous metal according to a second embodiment of the invention; and
Fig. 5
schematically a diagram of a pump shutdown with a soft starter.

Die Fig. 1 zeigt einen Pressstempel 1 einer Strangpresse zum Herstellen von Profilen aus Nichteisenmetall, der von zwei hydraulischen Kolben-Zylinder-Systemen 2 betätigt wird (s. Richtung des Doppelpfeils in Fig. 1). Die hydraulischen Kolben-Zylinder-Systeme 2 erhalten über eine Fluidleitung 8 unter Druck gesetztes Hydraulikfluid von einer Pumpe 3. Die Pumpe 3 wiederum wird von einem Elektromotor 4 angetrieben.The Fig. 1 shows a press ram 1 of an extruder for producing profiles of non-ferrous metal, which is actuated by two hydraulic piston-cylinder systems 2 (see the direction of the double arrow in Fig. 1 ). The hydraulic piston-cylinder systems 2 receive pressurized hydraulic fluid from a pump 3 via a fluid line 8. The pump 3 in turn is driven by an electric motor 4.

Der Elektromotor 4 ist mit einem Drehstromnetz 5 elektrisch verbunden, das die drei Phasen L1, L2 und L3 aufweist. Zwischen dem Drehstromnetz 5 und dem Elektromotor 4 ist eine Motorsteuerung (elektronische Schaltung) angeordnet, die als Mittel 6 zum Sanftstart bezeichnet ist.The electric motor 4 is electrically connected to a three-phase network 5, which has the three phases L 1 , L 2 and L 3 . Between the three-phase network 5 and the Electric motor 4, a motor controller (electronic circuit) is arranged, which is referred to as means 6 for soft start.

Die Mittel 6 zum Sanftstart sind in Fig. 2 detaillierter dargestellt. Die Mittel 6 umfassen für zwei Phasen - nämlich für die Phasen L1 und L3 - je eine Zweirichtungs-Thyristortriode 7. Die Wirkungsweise der Zweirichtungs-Thyristortriode 7 ist in den Figuren 3a bis 3c wiedergegeben.The means 6 for soft start are in Fig. 2 shown in more detail. The means 6 comprise for two phases - namely for the phases L1 and L3 - depending on a bidirectional thyristor triode 7. The operation of the bidirectional thyristor triode 7 is in the FIGS. 3a to 3c played.

In Fig. 3a ist zunächst der unbeeinflusste sinusförmige Verlauf der Spannung U einer Phase über der Zeit t skizziert. Dieser Spannungsverlauf entspricht der vollen Netzleistung und wird dem Elektromotor 4 zugeführt, wenn der Motor läuft und die volle Leistung bringen soll.In Fig. 3a First, the uninfluenced sinusoidal curve of the voltage U of a phase over time t is sketched. This voltage curve corresponds to the full network performance and is supplied to the electric motor 4 when the engine is running and should bring full power.

Während des Anlaufs des Elektromotors 4 sowie auch, wenn der Motor in seiner Leistungsaufnahme heruntergefahren werden soll, wird die Phase des Spannungsverlaufs U angeschnitten. Demgemäß wird die Leistung vom Netz auf den Elektromotor 4 erst dann übertragen, wenn die Zweirichtungs-Thyristortriode 7 "gezündet" wird. Die Zeitpunkte t, zu denen dies jeweils periodisch erfolgt, sind mit den Pfeilen 9 - symbolisierend die Zündung - in Fig. 3b und 3c angegeben. Nur die ausgezogenen Bereiche der Spannungskurve sorgen folglich dafür, dass dem Elektromotor 4 Energie vom Drehstromnetz 5 zugeführt wird. Die gestrichelten Verläufe indes geben den Zeitbereich an, über den - mangels noch nicht erfolgter Zündung - dem Elektromotor 4 keine Energie zugeführt wird.During the start of the electric motor 4 as well as when the motor is to be shut down in its power consumption, the phase of the voltage waveform U is cut. Accordingly, the power is transmitted from the mains to the electric motor 4 only when the bidirectional thyristor triode 7 is "ignited". The times t, to which this takes place periodically, are indicated by the arrows 9 - symbolizing the ignition - in Fig. 3b and 3c specified. Only the solid areas of the voltage curve thus ensure that the electric motor 4 energy is supplied from the three-phase network 5. The dashed curves, however, indicate the time range over which - in the absence of ignition which has not yet occurred - no energy is supplied to the electric motor 4.

Der Vergleich der Figuren 3b und 3c zeigt, dass abhängig von den Zündzeitpunkten mehr oder weniger Energie vom Drehstromnetz zum Elektromotor geleitet wird. Bei der Situation, wie sie sich aus Fig. 3b ergibt, ist es mehr Energie als im Falle der späteren Zündung gemäß Fig. 3c.The comparison of FIGS. 3b and 3c shows that depending on the ignition timing more or less energy is passed from the three-phase system to the electric motor. In the situation, how they look Fig. 3b results, it is more energy than in the case of the later ignition according to Fig. 3c ,

In Fig. 4 ist zu sehen, dass drei Elektromotoren 4 parallel arbeiten, um über eine Fluidleitung 8 zwei parallel geschaltete hydraulische Kolben-Zylinder-Systeme 2 mit Druckfluid zu versorgen.In Fig. 4 It can be seen that three electric motors 4 operate in parallel in order to supply two hydraulic piston-cylinder systems 2 connected in parallel with pressurized fluid via a fluid line 8.

Dabei ist es aufgrund der vorgeschlagenen Lösung problemlos möglich, die zugeführte Leistung über einen weiten Bereich zu steuern. Es wird nämlich durch entsprechende Nicht-Zündung der Zweirichtungs-Thyristortrioden der Mittel 6 des mittleren und des unteren Elektromotors (in Fig. 4 angegeben mit der Angabe "0%") hier noch gar keine Energie den Elektromotoren zugeführt, während die oberen Mittel 6 bereits mit der Zündung der Zweirichtungs-Thyristortriode arbeiten und folglich dem oberen Elektromotor 4 Energie zugeführt wird (in Fig. 4 angegeben mit der Angabe "10-100%").Due to the proposed solution, it is easily possible to control the supplied power over a wide range. Namely, it is by appropriate non-ignition of the bidirectional Thyristortrioden the means 6 of the middle and the lower electric motor (in Fig. 4 indicated with the indication "0%") here even no energy supplied to the electric motors, while the upper means 6 already work with the ignition of the bidirectional thyristor and thus the upper electric motor 4 energy is supplied (in Fig. 4 indicated with the indication "10-100%").

Die Fig. 4 zeigt also drei den Kolben-Zylinder-Systemen 2 zugeordnete Pumpen 3, wobei jeder Elektromotor 4 einer jeden Pumpe 3 mit Mitteln 6 zum Sanftstart versehen sind und bedarfsoptimiert die beiden unteren Pumpen abgeschaltet werden.The Fig. 4 Thus, FIG. 3 shows three pumps 3 associated with the piston-cylinder systems 2, each electric motor 4 of each pump 3 being provided with means 6 for soft starting and the two lower pumps being switched off as required.

In Fig. 5 ist - allerdings nur sehr schematisch - dargestellt, dass zwischen einem oberen Zustand ("Pumpe X eingeschaltet") und einem unteren Zustand ("Pumpe X ausgeschaltet") auch ein Einwirken durch die Mittel 6 zum Sanftstart erfolgen kann, um den Elektromotor entweder hochzufahren oder herunterzufahren.In Fig. 5 is shown - but only very schematically - that between an upper state ("pump X on") and a lower state ("pump X off") can also be acted upon by the means 6 for soft start to either start the electric motor or shut down.

In vorteilhafter Weise können somit die Pumpen bedarfsgerecht betrieben werden. Sie starten beispielsweise nur zum Blockwechsel bzw. in Abhängigkeit der Pressgeschwindigkeit, die erreicht werden soll.Advantageously, thus the pumps can be operated as needed. For example, they only start to block change or depending on the press speed that is to be achieved.

Die Nachrüstung des erfindungsgemäß vorgeschlagenen Systems ist einfach, da der Elektromotor bzw. Frequenzumrichter nicht FU-tauglich sein muss. Leistungskabel können ohne Schirm verwendet werden. Ferner besteht nur ein geringer Bedarf an Raum im Schaltschrank.The retrofitting of the proposed system according to the invention is simple, since the electric motor or frequency converter does not have to be FU-suitable. Power cables can be used without screen. Furthermore, there is only a small amount of space in the control cabinet.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11
Pressstempelpress die
22
Kolben-Zylinder-SystemPiston-cylinder system
33
Pumpepump
44
Elektromotorelectric motor
55
DrehstromnetzThree-phase system
66
Mittel zum SanftstartMeans for the soft start
77
Zweirichtungs-Thyristortriode (Triac)Bidirectional Thyristor Triode (Triac)
88th
Fluidleitungfluid line
99
Zündungignition
L1 L 1
Phasephase
L2 L 2
Phasephase
L3 L 3
Phasephase
UU
Spannungtension
tt
ZeitTime

Claims (10)

Strangpresse zum Herstellen von Profilen aus Nichteisenmetall, wobei die Strangpresse mindestens einen Pressstempel (1) aufweist, der durch mindestens ein hydraulisches Kolben-Zylinder-System (2) angetrieben wird, wobei das mindestens eine hydraulische Kolben-Zylinder-System (2) von mindestens einer Pumpe (3) mit Hydraulikfluid versorgt wird und wobei die mindestens eine Pumpe (3) von einem Elektromotor (4) angetrieben wird, der mit einem Drehstromnetz (5) in Verbindung steht,
dadurch gekennzeichnet,
dass der Elektromotor (4) mit Mitteln (6) zum Sanftstart versehen ist.Extruder for producing profiles from non-ferrous metal, the extruder having at least one press ram (1) which is driven by at least one hydraulic piston-cylinder system (2), the at least one hydraulic piston-cylinder system (2) of at least a pump (3) is supplied with hydraulic fluid and wherein the at least one pump (3) is driven by an electric motor (4) which is connected to a three-phase network (5),
characterized,
in that the electric motor (4) is provided with means (6) for soft starting. Strangpresse nach Anspruch 1,
dadurch gekennzeichnet,
dass die Mittel zum Sanftstart (6) zur Ausführung eines Phasenanschnitts der dem Elektromotor (4) zugeführten Wechselspannung (U) ausgebildet sind.Extruder according to claim 1,
characterized,
in that the means for soft start (6) are designed to carry out a phase control of the alternating voltage (U) supplied to the electric motor (4). Strangpresse nach Anspruch 2,
dadurch gekennzeichnet,
dass die Mittel zum Sanftstart (6) mindestens einen Thyristor umfassen.Extruder according to claim 2,
characterized,
in that the means for soft start (6) comprise at least one thyristor. Strangpresse nach Anspruch 2,
dadurch gekennzeichnet,
dass die Mittel zum Sanftstart (6) mindestens eine Zweirichtungs-Thyristortriode (Triac) (7) umfassen.Extruder according to claim 2,
characterized,
in that the means for soft start (6) comprise at least one bidirectional thyristor triode (7). Strangpresse nach Anspruch 3 oder 4,
dadurch gekennzeichnet,
dass mindestens zwei Thyristoren oder Zweirichtungs-Thyristortrioden (7) vorhanden sind, um mindestens zwei der drei Phasen (L1, L2, L3) der Wechselspannung (U) anzuschneiden.Extruder according to claim 3 or 4,
characterized,
that at least two thyristors or triacs (7) are provided in order to cut at least two of the three phases (L 1, L 2, L 3) of the alternating voltage (U). Strangpresse nach Anspruch 5,
dadurch gekennzeichnet,
dass drei Thyristoren oder Zweirichtungs-Thyristortrioden (7) vorhanden sind, um alle drei Phasen (L1 L2, L3) der Wechselspannung anzuschneiden.Extruder according to claim 5,
characterized,
that three thyristors or triacs (7) are provided in order to cut through all three phases (L 1 L 2, L 3) of the AC voltage. Strangpresse nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet,
dass der Elektromotor (4) ein Asynchronmotor ist.Extruder according to one of claims 1 to 6,
characterized,
that the electric motor (4) is an asynchronous motor. Strangpresse nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet,
dass eine Pumpe (3) zwei oder mehr hydraulische Kolben-Zylinder-Systeme (2) mit Hydraulikfluid versorgt.Extruder according to one of claims 1 to 7,
characterized,
that a pump (3) two or more hydraulic piston-cylinder systems (2) supplied with hydraulic fluid. Strangpresse nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet,
dass mehrere Pumpen (3) über kommunizierende Fluidleitungen (8) mindestens ein hydraulisches Kolben-Zylinder-System (2) mit Hydraulikfluid versorgen.Extruder according to one of claims 1 to 7,
characterized,
in that a plurality of pumps (3) supply at least one hydraulic piston-cylinder system (2) with hydraulic fluid via communicating fluid lines (8). Strangpresse nach Anspruch 9,
dadurch gekennzeichnet,
dass die Anzahl von Pumpen (3) über die kommunizierenden Fluidleitungen (8) mindestens zwei hydraulische Kolben-Zylinder-Systeme (2) mit Hydraulikfluid versorgen.Extruder according to claim 9,
characterized,
in that the number of pumps (3) supplies hydraulic fluid to at least two hydraulic piston-cylinder systems (2) via the communicating fluid lines (8).
EP11000975A 2010-02-25 2011-02-08 Extrusion press for manufacturing sections from non-ferrous metals Active EP2361700B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010009365 2010-02-25
DE102011009689A DE102011009689B4 (en) 2010-02-25 2011-01-28 Extruder for producing non-ferrous metal profiles

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EP2361700A1 true EP2361700A1 (en) 2011-08-31
EP2361700B1 EP2361700B1 (en) 2012-10-17

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EP (1) EP2361700B1 (en)
JP (1) JP5436476B2 (en)
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ES (1) ES2393680T3 (en)

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US20110203345A1 (en) 2011-08-25
JP2011177014A (en) 2011-09-08
DE102011009689B4 (en) 2012-09-13
US9211577B2 (en) 2015-12-15
ES2393680T3 (en) 2012-12-27
CN102166829B (en) 2016-02-24
EP2361700B1 (en) 2012-10-17
DE102011009689A1 (en) 2011-08-25
CN102166829A (en) 2011-08-31
JP5436476B2 (en) 2014-03-05

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