EP0618025B1 - Injection unit - Google Patents
Injection unit Download PDFInfo
- Publication number
- EP0618025B1 EP0618025B1 EP94103175A EP94103175A EP0618025B1 EP 0618025 B1 EP0618025 B1 EP 0618025B1 EP 94103175 A EP94103175 A EP 94103175A EP 94103175 A EP94103175 A EP 94103175A EP 0618025 B1 EP0618025 B1 EP 0618025B1
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- EP
- European Patent Office
- Prior art keywords
- spindle
- injection unit
- rotors
- casting
- unit according
- Prior art date
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/2015—Means for forcing the molten metal into the die
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
- B30B1/18—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by screw means
- B30B1/181—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by screw means the screw being directly driven by an electric motor
Definitions
- the invention relates to a press-in unit for a die casting machine, with a casting plunger for pressing in casting material into the shape that over a spindle that interacts with a nut is driven by an electric motor.
- Modern press-in units of die casting machines are multi-phase press-in systems, especially designed three-phase systems.
- a first, slow preparatory phase the The plunger moves forward until the casting material reaches the gate is brought up while in a second phase short filling time and high pressing speed into the mold cavity of the locking part is pressed.
- crucial third phase there is a compression of the die casting under high To press.
- the casting piston is used to carry out these phases an elaborate, several pressure accumulators as well as control and Hydraulic control devices connected.
- a press-in unit of this type is known from DE 29 22 914 C2.
- three pressure accumulators are provided, the various with check, seat and control valves provided lines with the casting piston cylinder in Connect.
- the pressure medium from the first pressure accumulator moves the plunger from a rest position to one Position in which the casting material is at the gate, after which Reversal of a seat valve pressure medium from the second Accumulator under high pressure and at high speed is guided on the casting piston, so that the casting material is quickly shot into the mold.
- the third pressure accumulator upstream seat valve switched so that the in this third pressure accumulator pending pressure on a multiplier piston and by using a gear ratio can be passed on to the casting piston.
- a press-in unit with a casting piston of the type mentioned Art is known from EP 0 430 616 A1.
- this publication also shows otherwise only for machine tools, especially for Screw presses (Dubbel, paperback for mechanical engineering, 14. Edition, Springer Verlag, 81, p. 983 and 984) known arrangement an electric motor as a drive for a casting piston.
- a spindle rotatable by the motor is provided on which one mother connected to the casting piston runs.
- the invention is therefore based on the object of a press-in unit of the type mentioned in such a way that on separate protective devices for the spindle thread are dispensed with can be without the die casting process necessary conditions are impaired.
- the nut for the spindle is fixed to solve this task connected to the rotors of the electric motor and with a threaded section the spindle engaged, the Rotors complete as a threaded section of the spindle enclosing protective housing are formed.
- the sensitive thread section of the Spindle that is within the range provided for a ball screw Mother runs, completely encapsulated and therefore after protected outside. Those occurring in the rough casting operation Contamination that would otherwise be difficult to keep away from the drive can have no harmful influence in this way exert on the drive.
- the pouring piston movement can over it controlled precisely.
- the structure of the press-in unit is simplified because there is no longer a complex hydraulic system is necessary. The use of an environmentally unfriendly hydraulic fluid is avoided.
- the rotating movements of the electric motor also directly to control the casting process to be used.
- the respective position of the piston rod of the casting piston can be determined from the number of revolutions.
- Another embodiment sees one between the electric motor and the casting piston designed reduction. Let it through different pressures due to different Achieve torque forces, so that the drive even with larger ones Machines can be used.
- the electric motor can be one be a multi-stage electric motor, which means that the required for the press-in unit of die casting machines Power adjustment both in terms of speeds, as well as with regard to the forces to be generated.
- water cooling can be used for the electric motor itself be provided if its performance needs to be increased.
- the press-in unit (10) shown in FIG. 1 comprises an electric motor (20) with a two-stage servo motor two stators (21, arranged within a housing (28) 22) and rotors (23 and 24) associated with these stators is executed.
- the rotors (23, 24) are fixed with a between You arranged mother (25) connected, which with a thread (26) a threaded portion (14) of a ball screw (13) records.
- the spindle (13) extends coaxial to the axis of rotation of the rotors (23, 24).
- the rotors are hollow and form a protective housing for the Threaded section (14) of the spindle (13) that the threaded section (14) completely encapsulated.
- the spindle (13) is from a bore (30) on one of the end faces of the rotor housing led out tight.
- the spindle shaft, through the bore (30) from the area of the rotors (23, 24) extends through one with a Seal (31) provided opening (15) of a housing (11) Casting chamber inside (12) the same.
- a seal can also be provided.
- the end (13a) of the spindle (13) is inside (12) the casting chamber via a coupling (32) fixed to one end of a piston rod (16) connected.
- the pouring plunger which serves the pouring material as described above from inside the casting chamber in press the shape.
- a striker for such a shape is familiar to the person skilled in the art and e.g. known from WO 91/06 415 A1.
- the spindle (13) is used to drive the casting piston also the piston rod (16) by rotating the fixed with the Rotors (23, 24) of the electric motor (20) connected nut (25) in a longitudinal movement in the sense of the double arrow shown transferred.
- Electric motor (20) are operated in two speed levels. Its performance can be switched on or off by the second Stator can be changed. About the electric motor (20) can therefore on the casting piston both at different speeds, as well as with different forces.
- the spindle (13) is designed as a ball screw. This is clear from the details of Figure 2. By this configuration is the power transmission from the electric motor decisively improved on the casting piston.
- the embodiment shown in the drawing shows one two-stage servo motor.
- other electric drives can also be used be used.
- two are conceivable or more electric motors with different gear ratios connect to the ball screw (13).
- the threaded section (14) on the principle of a ball screw with a thread is equipped with high accuracy, the threads of which one have adapted cross-section for the circulation of balls, the in a corresponding thread (33) on the inside the mother (25) continues.
- the balls (34) are in the threads of the spindle (13) in the corresponding Threads (33) of the nut (25) in a known manner in circulation guided. You leave the threads at point (35) and become an entry point (36) via a deflection channel (37) led from where they are at the rotation of the mother (25), the is triggered by the rotary movement of the rotors (23, 24), get back into their threads.
- the mother (25) is, as Figure 2 shows, composed of two parts, the adjoin each other with a flange (38) and under Intermediate insertion of a preload adjuster (39)
- Bolts (40) are held by flanges (41) Rotors (23 and 24) and through the flanges (38) of the two Nut parts are passed.
- the nut (25) is non-rotatable with the Rotors (23 and 24) connected. If the stators (21 and 22) acted upon individually or collectively, or is also in a known control of the rotors (23 and 24) made, then the nut (25) with in corresponding Rotary movements offset. Through this rotation the spindle (13) becomes an axial movement in the desired manner causes that moves the plunger.
- the press-in unit according to the invention can be used both in warm chambers can also be used in cold chamber casting machines.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Press Drives And Press Lines (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Control Of Presses (AREA)
- Transmission Devices (AREA)
- Luminescent Compositions (AREA)
- Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
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Abstract
Description
Die Erfindung betrifft ein Einpreßaggregat für eine Druckgießmaschine, mit einem Gießkolben zum Einpressen von Gießmaterial in die Form, der über eine Spindel, die mit einer Mutter zusammenwirkt, von einem Elektromotor angetrieben wird.The invention relates to a press-in unit for a die casting machine, with a casting plunger for pressing in casting material into the shape that over a spindle that interacts with a nut is driven by an electric motor.
Moderne Einpreßaggregate von Druckgießmaschinen sind als Mehrphasen-Einpreßsysteme, insbesondere Dreiphasensysteme konzipiert. Dabei wird in einer ersten, langsamen Vorlaufphase der Gießkolben vorwärts bewegt, bis das Gießmaterial an den Anschnitt gebracht ist, während es in einer zweiten Phase mit kurzer Füllzeit und hoher Einpreßgeschwindigkeit in den Formhohlraum des Schließteils eingepreßt wird. In einer für die Qualität der vergossenen Produkte entscheidenden dritten Phase erfolgt eine Verdichtung des Druckgußstückes unter hohen Drücken. Der Gießkolben ist zur Durchführung dieser Phasen mit einer aufwendigen, mehrere Druckspeicher sowie Steuer- und Regeleinrichtungen umfassenden Hydraulik verbunden.Modern press-in units of die casting machines are multi-phase press-in systems, especially designed three-phase systems. In a first, slow preparatory phase, the The plunger moves forward until the casting material reaches the gate is brought up while in a second phase short filling time and high pressing speed into the mold cavity of the locking part is pressed. In one for the Quality of the potted products crucial third phase there is a compression of the die casting under high To press. The casting piston is used to carry out these phases an elaborate, several pressure accumulators as well as control and Hydraulic control devices connected.
Ein Einpreßaggregat dieser Art ist aus der DE 29 22 914 C2 bekannt. Bei diesem Einpreßaggregat sind drei Druckspeicher vorgesehen, die über verschiedene mit Rückschlag-, Sitz- und Steuerventilen versehene Leitungen mit dem Gießkolbenzylinder in Verbindung stehen. Das Druckmittel aus dem ersten Druckspeicher bewegt dabei den Gießkolben aus einer Ruhestellung in eine Stellung, in der das Gießmaterial am Anschnitt ist, worauf nach Umsteuerung eines Sitzventils Druckmittel aus dem zweiten Druckspeicher unter hohem Druck und mit großer Geschwindigkeit auf den Gießkolben geführt wird, so daß das Gießmaterial schnell in die Form eingeschossen wird. Zur Durchführung der dritten Phase wird nun ein weiteres, dem dritten Druckspeicher vorgeschaltetes Sitzventil umgeschaltet, so daß der in diesem dritten Druckspeicher anstehende Druck auf einen Multiplikatorkolben und von diesem unter Ausnützung eines Übersetzungsverhältnisses auf den Gießkolben weitergeleitet werden kann. Der in seiner Endstellung stehende Gießkolben setzt dadurch das bereits in die Form eingeschossene Gießmaterial unter einen sehr hohen Druck, wodurch der Qualitätsguß erreicht wird. Dabei wird die Steuerung der verschiedenen Druckphasen abhängig von dem vom Gießkolben zurückgelegten Weg vorgenommen. Die Lage der Kolbenstange des Gießkolbens muß daher durch gesonderte Einrichtungen überwacht werden. Bei diesen Bauarten ist es auch als ein gewisser Nachteil anzusehen, daß wegen der hohen Temperaturen im Bereich der Druckgießmaschinen anstelle von Öl als Hydraulikflüssigkeit sogenannte Wasserglykole verwendet werden, die nicht so schnell entflammbar wie Öl, aber umweltunfreundlich sind und, wenn Dichtungen beschädigt werden, auch zu einer Beeinträchtigung der Gesundheit der Bedienungsperson führen können.A press-in unit of this type is known from DE 29 22 914 C2. In this press-in unit, three pressure accumulators are provided, the various with check, seat and control valves provided lines with the casting piston cylinder in Connect. The pressure medium from the first pressure accumulator moves the plunger from a rest position to one Position in which the casting material is at the gate, after which Reversal of a seat valve pressure medium from the second Accumulator under high pressure and at high speed is guided on the casting piston, so that the casting material is quickly shot into the mold. To carry out the The third phase is now another, the third pressure accumulator upstream seat valve switched so that the in this third pressure accumulator pending pressure on a multiplier piston and by using a gear ratio can be passed on to the casting piston. Of the This means that the pouring piston in its end position sets this Casting material already shot into the mold under one very high pressure, whereby the quality casting is achieved. Here the control of the different printing phases is dependent on the path covered by the casting piston. The location of the Piston rod of the casting piston must therefore by separate facilities be monitored. It is also the case with these types to be considered as a certain disadvantage that because of the high temperatures in the field of die casting machines instead of oil as Hydraulic fluid called water glycols are used which is not as flammable as oil, but environmentally unfriendly and, if seals are damaged, also become one Impact the health of the operator can.
Ein Einpreßaggragat mit einem Gießkolben der eingangs genannten Art ist aus der EP 0 430 616 A1 bekannt. Wenngleich dort nicht ausdrücklich von einem Einpreßaggregat für eine Druckgießmaschine gesprochen wird, zeigt diese Druckschrift jedoch auch die ansonsten nur bei Werkzeugmaschinen, insbesondere bei Spindelpressen (Dubbel, Taschenbuch für den Maschinenbau, 14. Auflage, Springer Verlag, 81, S. 983 und 984) bekannte Anordnung eines Elektromotors als Antieb für einen Gießkolben. Dort ist eine vom Motor drehbare Spindel vorgesehen, auf der eine mit dem Gießkolben verbundene Mutter läuft. Bei solchen Bauarten müssen für den rauhen Betrieb bei Druckgießmaschinen gesonderte Schmutzmaßnahmen für das empfindliche Spindelgewinde vorgesehen werden, das sonst verschmutzen und die Funktion infrage stellen kann. Der zusätzliche Aufwand solcher Schutzmaßnahmen kann erheblich sein.A press-in unit with a casting piston of the type mentioned Art is known from EP 0 430 616 A1. Although not there expressly from a press-in unit for a die casting machine is spoken, but this publication also shows otherwise only for machine tools, especially for Screw presses (Dubbel, paperback for mechanical engineering, 14. Edition, Springer Verlag, 81, p. 983 and 984) known arrangement an electric motor as a drive for a casting piston. There a spindle rotatable by the motor is provided on which one mother connected to the casting piston runs. With such designs must be separate for rough operation with die casting machines Dirt measures for the sensitive spindle thread be provided, which otherwise contaminate and the function in question can put. The additional effort of such protective measures can be significant.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Einpreßaggregat der eingangs genannten Art so zu gestalten, daß auf gesonderte Schutzeinrichtungen für das Spindelgewinde verzichtet werden kann, ohne daß aber die für den Druckgießvorgang notwendigen Voraussetzungen beeinträchtigt werden.The invention is therefore based on the object of a press-in unit of the type mentioned in such a way that on separate protective devices for the spindle thread are dispensed with can be without the die casting process necessary conditions are impaired.
Ausgehend von einem Einpreßaggregat der eingangs genannten Art wird zur Lösung dieser Aufgabe die Mutter für die Spindel fest mit den Rotoren des Elektromotors verbunden und mit einem Gewindeabschnitt der Spindel in Eingriff gebracht, wobei die Rotoren als ein den Gewindeabschnitt der Spindel vollständig umschließendes Schutzgehäuse ausgebildet sind.Starting from a press-in unit of the type mentioned the nut for the spindle is fixed to solve this task connected to the rotors of the electric motor and with a threaded section the spindle engaged, the Rotors complete as a threaded section of the spindle enclosing protective housing are formed.
Durch die Maßnahmen kann der empfindliche Gewindeabschnitt der Spindel, der innerhalb der bei einer Kugelumlaufspindel vorgesehenen Mutter läuft, vollständig abgekapselt und damit nach außen geschützt werden. Die im rauhen Gießbetrieb auftretenden Verunreinigungen, die sich sonst auch schwer vom Antrieb fernhalten lassen, können auf diese Weise keinen schädlichen Einfluß auf den Antrieb ausüben. Die Gießkolbenbewegung kann darüber hinaus präzise gesteuert werden. Der Aufbau des Einpreßaggregates wird vereinfacht, da keine aufwendige Hydraulik mehr nötig ist. Die Verwendung einer umweltunfreundlichen Hydraulikflüssigkeit wird vermieden. Schließlich können die Drehbewegungen des Elektromotores unmittelbar auch zur Steuerung des Gießvorganges benutzt werden. Die jeweilige Lage der Kolbenstange des Gießkolbens läßt sich aus der Umdrehungsanzahl bestimmen. Dabei hat es sich als besonders vorteilhaft und geeignet für den Antrieb des Einpreßaggregates einer Druckgießmaschine erwiesen, wenn als Spindel eine Kugelumlaufspindel vorgesehen ist. Bei dieser Ausgestaltung können große Vortriebsgeschwindigkeiten bei sehr großen Drücken verwirklicht werden, wie sie für Druckgießmaschinen erforderlich sind, was eingangs erläutert wurde. The sensitive thread section of the Spindle that is within the range provided for a ball screw Mother runs, completely encapsulated and therefore after protected outside. Those occurring in the rough casting operation Contamination that would otherwise be difficult to keep away from the drive can have no harmful influence in this way exert on the drive. The pouring piston movement can over it controlled precisely. The structure of the press-in unit is simplified because there is no longer a complex hydraulic system is necessary. The use of an environmentally unfriendly hydraulic fluid is avoided. Finally, the rotating movements of the electric motor also directly to control the casting process to be used. The respective position of the piston rod of the casting piston can be determined from the number of revolutions. It has proven to be particularly advantageous and suitable for proven the drive of the injection unit of a die casting machine, if a ball screw is provided as the spindle is. With this configuration, high propulsion speeds can be achieved can be realized at very high pressures as they are are required for die casting machines, which is explained at the beginning has been.
Eine weitere Ausgestaltung sieht eine zwischen dem Elektromotor und dem Gießkolben gestaltete Untersetzung vor. Dadurch lassen sich auch unterschiedliche Drücke aufgrund unterschiedlicher Drehmomentskräfte erzielen, so daß der Antrieb auch bei größeren Maschinen verwendbar ist.Another embodiment sees one between the electric motor and the casting piston designed reduction. Let it through different pressures due to different Achieve torque forces, so that the drive even with larger ones Machines can be used.
Bei einer anderen Ausführungsform kann der Elektromotor ein mehrstufiger Elektromotor sein, wodurch die eingangs erwähnte, beim Einpreßaggregat von Druckgießmaschinen erforderliche Leistungsanpassung sowohl hinsichtlich der Geschwindigkeiten, als auch hinsichtlich der zu erzeugenden Kräfte möglich ist.In another embodiment, the electric motor can be one be a multi-stage electric motor, which means that the required for the press-in unit of die casting machines Power adjustment both in terms of speeds, as well as with regard to the forces to be generated.
Schließlich kann für den Elektromotor selbst eine Wasserkühlung vorgesehen werden, wenn dessen Leistung erhöht werden muß.Finally, water cooling can be used for the electric motor itself be provided if its performance needs to be increased.
Die Erfindung ist anhand eines Ausführungsbeispieles in der Zeichnung dargestellt und wird im folgenden näher erläutert. Es zeigen:
- Fig. 1
- einen Ausschnitt des Querschnittes durch eine erfindungsgemäßes Einpreßaggregat mit einer von einem Elektromotor getriebenen Kugelumlaufspindel, und
- Fig. 2
- die vergrößerte Darstellung des Bereiches der Mutter der Kugelumlaufspindel der Figur 1.
- Fig. 1
- a section of the cross section through a press-in unit according to the invention with a ball screw driven by an electric motor, and
- Fig. 2
- the enlarged view of the area of the nut of the ball screw of Figure 1.
Das in der Figur 1 dargestellte Einpreßaggregat (10) umfaßt einen Elektromotor (20), der als zweistufiger Servomotor mit zwei innerhalb eines Gehäuses (28) angeordneten Statoren (21, 22) und mit diesen Statoren zugeordneten Rotoren (23 und 24) ausgeführt ist. Die Rotoren (23, 24) sind fest mit einer zwischen Ihnen angeordneten Mutter (25) verbunden, welche mit einem Gewinde (26) einen Gewindeabschnitt (14) einer Kugelumlaufspindel (13) aufnimmt. Die Spindel (13) erstreckt sich koaxial zur Rotationsachse der Rotoren (23, 24). Die Rotoren sind hohl ausgebildet und bilden ein Schutzgehäuse für den Gewindeabschnitt (14) der Spindel (13), das den Gewindeabschnitt (14) vollkommen abkapselt. Lediglich der glatte Schaft der Spindel (13) ist aus einer Bohrung (30) an einer der Stirnseiten des Rotorgehäuses dicht herausgeführt. Der Spindelschaft, der durch die Bohrung (30) aus dem Bereich der Rotoren (23, 24) herausgeführt ist, erstreckt sich durch eine mit einer Dichtung (31) versehene Öffnung (15) eines Gehäuses (11) der Gießkammer bis in das Innere (12) derselben. An der Bohrung (30) kann ebenfalls noch eine Abdichtung vorgesehen sein. Das Ende (13a) der Spindel (13) ist im Inneren (12) der Gießkammer über eine Kupplung (32) fest mit einem Ende einer Kolbenstange (16) verbunden.The press-in unit (10) shown in FIG. 1 comprises an electric motor (20) with a two-stage servo motor two stators (21, arranged within a housing (28) 22) and rotors (23 and 24) associated with these stators is executed. The rotors (23, 24) are fixed with a between You arranged mother (25) connected, which with a thread (26) a threaded portion (14) of a ball screw (13) records. The spindle (13) extends coaxial to the axis of rotation of the rotors (23, 24). The rotors are hollow and form a protective housing for the Threaded section (14) of the spindle (13) that the threaded section (14) completely encapsulated. Only the smooth shaft the spindle (13) is from a bore (30) on one of the end faces of the rotor housing led out tight. The spindle shaft, through the bore (30) from the area of the rotors (23, 24) extends through one with a Seal (31) provided opening (15) of a housing (11) Casting chamber inside (12) the same. At the hole (30) a seal can also be provided. The The end (13a) of the spindle (13) is inside (12) the casting chamber via a coupling (32) fixed to one end of a piston rod (16) connected.
An dem nicht dargestellten anderen Ende der Kolbenstange (16) befindet sich der Gießkolben, der dazu dient, das Gießmaterial wie vorstehend beschrieben aus dem Inneren der Gießkammer in die Form einzupressen. Ein Schließteil für eine solche Form ist dem Fachmann geläufig und z.B. aus der WO 91/06 415 A1 bekannt.At the other end of the piston rod (16), not shown is the pouring plunger, which serves the pouring material as described above from inside the casting chamber in press the shape. A striker for such a shape is familiar to the person skilled in the art and e.g. known from WO 91/06 415 A1.
Zum Antrieb des Gießkolbens wird die Spindel (13) und somit auch die Kolbenstange (16) durch eine Rotation der fest mit den Rotoren (23, 24) des Elektromotors (20) verbundenen Mutter (25) in eine Längsbewegung im Sinn des eingezeichneten Doppelpfeils versetzt. Mit einer Regel- und Steuereinrichtung (27) kann der Elektromotor (20) in zwei Geschwindigkeitsstufen betrieben werden. Seine Leistung kann durch Zu- oder Abschaltung des zweiten Stators verändert werden. Über den Elektromotor (20) kann daher auf den Gießkolben sowohl mit unterschiedlicher Geschwindigkeit, als auch mit unterschiedlicher Kraft eingewirkt werden. Auf diese Weise wird es möglich, auch bei Verwendung eines Elektromotores die für den Einpreßvorgang wichtigen Phasen der Bewegung und der Druckausübung auf den Gießkolben zu erreichen, ohne daß - wegen der Abkapselung des Gewindeabschnittes (14) der Spindel (13) - nachteilige Einflüsse etwa durch die hohe Gießtemperatur oder durch Verschmutzungen auf den Antrieb wirken können.The spindle (13) is used to drive the casting piston also the piston rod (16) by rotating the fixed with the Rotors (23, 24) of the electric motor (20) connected nut (25) in a longitudinal movement in the sense of the double arrow shown transferred. With a regulating and control device (27) Electric motor (20) are operated in two speed levels. Its performance can be switched on or off by the second Stator can be changed. About the electric motor (20) can therefore on the casting piston both at different speeds, as well as with different forces. This way it becomes possible even when using a Electric motor the phases of the press-fit process To achieve movement and pressure on the plunger without - because of the encapsulation of the threaded section (14) the spindle (13) - adverse influences such as the high Casting temperature or due to contamination on the drive can.
Die Spindel (13) ist als eine Kugelumlaufspindel ausgebildet. Das wird im einzelnen noch anhand von Figur 2 deutlich. Durch diese Ausgestaltung wird die Kraftübertragung vom Elektromotor auf den Gießkolben entscheidend verbessert.The spindle (13) is designed as a ball screw. This is clear from the details of Figure 2. By this configuration is the power transmission from the electric motor decisively improved on the casting piston.
Die in der Zeichnung dargestellte Ausführungsform zeigt einen zweistufen Servomotor. Es können jedoch auch andere Elektroantriebe verwendet werden. Des weiteren ist es denkbar, zwei oder mehr Elektromotoren mit unterschiedlichen Untersetzungen an die Kugelumlaufspindel (13) anzuschließen.The embodiment shown in the drawing shows one two-stage servo motor. However, other electric drives can also be used be used. Furthermore, two are conceivable or more electric motors with different gear ratios connect to the ball screw (13).
Aus der Figur 2 ist erkennbar, daß der Gewindeabschnitt (14) nach dem Prinzip einer Kugelumlaufspindel mit einem Gewinde hoher Genauigkeit ausgestattet ist, dessen Gewindegänge einen für den Umlauf von Kugeln angepaßten Querschnitt aufweisen, der sich in einem korrespondierenden Gewinde (33) auf der Innenseite der Mutter (25) fortsetzt. Die Kugeln (34) werden dabei in den Gewindegängen der Spindel (13) in den entsprechenden Gewindegängen (33) der Mutter (25) in bekannter Weise im Umlauf geführt. Sie verlassen die Gewindegänge an der Stelle (35) und werden zu einer Einlaufstelle (36) über einen Umlenkkanal (37) geführt, von wo aus sie bei der Rotation der Mutter (25), die durch die Drehbewegung der Rotoren (23, 24) ausgelöst wird, wieder in ihre Gewindegänge gelangen. Durch diese Kugeln (34) entsteht ein formschlüssiger Eingriff zwischer der Mutter (25) einerseits und der Spindel (13) andererseits. Die Mutter (25) ist, wie Figur 2 zeigt, aus zwei Teilen zusammengesetzt, die jeweils mit einem Flansch (38) aneinandergrenzen und unter Zwischenfügung einer Vorbelastungseinstellscheibe (39) durch Schraubbolzen (40) gehalten sind, die durch Flansche (41) der Rotoren (23 und 24) und durch die Flansche (38) der beiden Mutternteile hindurchgeführt sind.It can be seen from FIG. 2 that the threaded section (14) on the principle of a ball screw with a thread is equipped with high accuracy, the threads of which one have adapted cross-section for the circulation of balls, the in a corresponding thread (33) on the inside the mother (25) continues. The balls (34) are in the threads of the spindle (13) in the corresponding Threads (33) of the nut (25) in a known manner in circulation guided. You leave the threads at point (35) and become an entry point (36) via a deflection channel (37) led from where they are at the rotation of the mother (25), the is triggered by the rotary movement of the rotors (23, 24), get back into their threads. Through these balls (34) there is a positive engagement between the mother (25) on the one hand and the spindle (13) on the other. The mother (25) is, as Figure 2 shows, composed of two parts, the adjoin each other with a flange (38) and under Intermediate insertion of a preload adjuster (39) Bolts (40) are held by flanges (41) Rotors (23 and 24) and through the flanges (38) of the two Nut parts are passed.
Auf die geschilderte Weise ist die Mutter (25) drehfest mit den Rotoren (23 und 24) verbunden. Werden daher die Statoren (21 und 22) einzeln oder gemeinsam beaufschlagt oder wird in ebenfalls bekannter Weise eine entsprechende Steuerung der Rotoren (23 und 24) vorgenommen, dann wird die Mutter (25) mit in entsprechende Drehbewegungen versetzt. Durch diese Drehbewegung wird die Spindel (13) in der gewünschten Weise zu einer Axialbewegung veranlaßt, die den Gießkolben bewegt.In the manner described, the nut (25) is non-rotatable with the Rotors (23 and 24) connected. If the stators (21 and 22) acted upon individually or collectively, or is also in a known control of the rotors (23 and 24) made, then the nut (25) with in corresponding Rotary movements offset. Through this rotation the spindle (13) becomes an axial movement in the desired manner causes that moves the plunger.
Es leuchtet ein, daß je nach Auslegung des Elektroantriebes mit der gezeigten Anordnung bei Wahl hoher Drehzahlen, auch sehr große Vorschubgeschwindigkeiten für den Gießkolben erreicht werden können. Durch die Zusammenschaltung mehrerer Statoren und/oder Rotoren, lassen sich auch entsprechend hohe Drehmomente verwirklichen, die auch die erforderlichen hohen Drücke für den Einpreßvorgang verwirklichen können.It makes sense that depending on the design of the electric drive with the arrangement shown when choosing high speeds, also very much high feed speeds for the casting piston reached can be. By interconnecting several stators and / or rotors, correspondingly high torques can also be achieved realize that also the required high pressures for can realize the press-in process.
Der Vorteil in der Verwendung eines Elektromotores zum Antrieb des Gießkolbens liegt außerdem in den bereits eingangs erwähnten Vorteilen darin, daß nicht erst ein Antriebsdruck für den Gießkolben aufgebaut werden muß, wie das bei hydraulischen Antrieben der Fall ist, sondern daS der Gießkolben stets mit genau definierter Leistung in Abhängigkeit von der Spannungsbeaufschlagung in Bewegung versetzt werden kann. Darüber hinaus sind die zur Steuerung des Einpreßaggregates (10) wichtigen Parameter einfach bestimmbar. Da die Mutter (25) stets mit der Spindel (13) in Verbindung steht, kann aus der Anzahl der Umdrehungen der Mutter (25) bzw. der Rotoren (23, 24) eindeutig auf die Position des Gießkolbens im Einpreßaggregat geschlossen werden. Durch Verwendung eines Drehzahlaufnehmers kann die Drehzahl und somit die Gießkolbenposition jederzeit bestimmt werden. Dies kann in bekannter Weise zur Steuerung ausgenützt werden, ohne daß besondere Vorkehrungen zur Erfassung der Lage des Gießkolbens notwendig sind.The advantage of using an electric motor for driving the plunger is also in those already mentioned Advantages in that not only a drive pressure for the Casting pistons must be built up, as is the case with hydraulic drives is the case, but that the casting piston is always accurate defined performance depending on the voltage applied can be set in motion. Furthermore are the important for controlling the press-in unit (10) Easy to determine parameters. Since the mother (25) always with the Spindle (13) communicates from the number of revolutions the nut (25) or the rotors (23, 24) clearly closed on the position of the casting piston in the press-in unit will. By using a speed sensor, the The speed and thus the position of the casting piston are determined at all times will. This can be used for control in a known manner without taking special precautions to record the situation of the casting piston are necessary.
Das erfindungsgemäße Einpreßaggregat kann sowohl in Warmkammerals auch in Kaltkammergießmaschinen Verwendung finden.The press-in unit according to the invention can be used both in warm chambers can also be used in cold chamber casting machines.
Claims (9)
- Injection unit for a die-casting machine, with a plunger for pressing the casting material into the mould, which plunger is driven by an electromotor via a spindle which cooperates with a nut, characterised in that the nut (25) for the spindle (13) is connected securely to the rotors (23, 24) of the electromotor (20) and is in engagement with a threaded section (14) of the spindle (13); and in that the rotors are formed as a protective casing which surrounds the threaded section (14) of the spindle (13) completely.
- Injection unit according to Claim 1, characterised in that the spindle (13) is a circulating ball spindle.
- Injection unit according to Claim 1, characterised in that the piston rod of the plunger is formed as a spindle (13).
- Injection unit according to Claim 1, characterised in that the spindle (13) extends through an aperture (15) of a casing (11) of the casting chamber and is connected axially to a piston rod (16), which is connected to the plunger.
- Injection unit according to Claim 1, characterised in that the spindle (13) is disposed coaxial to the axis of the rotors (23, 24) and is conducted to the exterior in a sealed manner through an aperture (30) in the face of one of the rotors (24).
- Injection unit according to Claim 1, characterised in that the axial length of the inner hollow chamber of the rotors (23, 24) is coordinated with the maximum stroke of the spindle (13) in such a manner that the threaded section (14) of the spindle (13) always remains inside the protective casing which is formed by the rotors (23, 24).
- Injection unit according to any one of Claims 1 to 6, characterised in that a gear reducer is provided, this being connected between the electromotor (20) and the plunger.
- Injection unit according to any one of Claims 1 to 7, characterised in that the electromotor (20) is formed as a multiple stage drive.
- Injection unit according to any one of Claims 1 to 8, characterised in that a water cooler is provided for the electromotor (20).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4310310 | 1993-03-30 | ||
| DE4310310A DE4310310A1 (en) | 1993-03-30 | 1993-03-30 | Press-in unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0618025A1 EP0618025A1 (en) | 1994-10-05 |
| EP0618025B1 true EP0618025B1 (en) | 1998-05-13 |
Family
ID=6484228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94103175A Expired - Lifetime EP0618025B1 (en) | 1993-03-30 | 1994-03-03 | Injection unit |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5482101A (en) |
| EP (1) | EP0618025B1 (en) |
| JP (1) | JP3348958B2 (en) |
| AT (1) | ATE166010T1 (en) |
| DE (2) | DE4310310A1 (en) |
| ES (1) | ES2117163T3 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7387253B1 (en) * | 1996-09-03 | 2008-06-17 | Hand Held Products, Inc. | Optical reader system comprising local host processor and optical reader |
| DE59906506D1 (en) * | 1999-04-13 | 2003-09-11 | Frech Oskar Gmbh & Co | Hot chamber die casting machine |
| EP1057560A1 (en) * | 1999-06-01 | 2000-12-06 | Oskar Frech Gmbh & Co. | Injection unit for a pressure diecasting machine |
| EP1201334B1 (en) * | 2000-10-27 | 2005-03-23 | Oskar Frech GmbH + Co. KG | Hot chamber die casting machine and method of operation therefor |
| WO2002085599A1 (en) * | 2001-04-19 | 2002-10-31 | Demag Ergotech Gmbh | Injection moulding machine comprising an electromotive spindle drive and a spring working memory for supporting the electric motor |
| US7172085B2 (en) * | 2001-12-04 | 2007-02-06 | Beaudette Susan A | Squeezable, fillable feeding device |
| JP2006142369A (en) * | 2004-11-24 | 2006-06-08 | Ykk Corp | Motor-driven injection unit, die-casting machine equipped with the same and motor-driven injection method |
| JP2009297771A (en) * | 2008-06-17 | 2009-12-24 | Sumitomo Heavy Industries Techno-Fort Co Ltd | Knock-out apparatus in forging press |
| CN104675784A (en) * | 2013-11-30 | 2015-06-03 | 富泰华工业（深圳）有限公司 | Rotary pressing cylinder |
| CN117267285B (en) * | 2023-11-21 | 2024-02-02 | 山西汤荣机械制造股份有限公司 | Brake drum convenient to heat dissipation and casting device thereof |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1804261A1 (en) * | 1968-06-18 | 1970-05-14 | Druckguss Heidenau Veb | Pressure system for pressure casting machine |
| AT292222B (en) * | 1969-04-28 | 1971-08-25 | Peter Florjancic | Spindle locking device, especially for injection molding machines |
| DE2922914A1 (en) * | 1979-06-06 | 1980-12-11 | Oskar Frech Werkzeugbau Gmbh & | METHOD AND ARRANGEMENT FOR CONTROLLING THE INPRESSION PROCESS IN COLD CHAMBER DIE CASTING MACHINES |
| JPS61220817A (en) * | 1985-03-28 | 1986-10-01 | Fanuc Ltd | Measuring and kneading system for injection molding machine |
| JPS61235119A (en) * | 1985-04-12 | 1986-10-20 | Nissei Plastics Ind Co | Method and device for controlling injection of injection molding machine |
| US4990084A (en) * | 1989-11-06 | 1991-02-05 | Cincinnati Milacron Inc. | Mold clamping system |
| GB8927088D0 (en) * | 1989-11-30 | 1990-01-31 | Frys Metals Ltd | Casting apparatus |
-
1993
- 1993-03-30 DE DE4310310A patent/DE4310310A1/en not_active Withdrawn
-
1994
- 1994-03-03 ES ES94103175T patent/ES2117163T3/en not_active Expired - Lifetime
- 1994-03-03 EP EP94103175A patent/EP0618025B1/en not_active Expired - Lifetime
- 1994-03-03 AT AT94103175T patent/ATE166010T1/en active
- 1994-03-03 DE DE59405931T patent/DE59405931D1/en not_active Expired - Lifetime
- 1994-03-28 US US08/218,593 patent/US5482101A/en not_active Expired - Lifetime
- 1994-03-29 JP JP05885794A patent/JP3348958B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE4310310A1 (en) | 1994-10-06 |
| ES2117163T3 (en) | 1998-08-01 |
| JP3348958B2 (en) | 2002-11-20 |
| ATE166010T1 (en) | 1998-05-15 |
| US5482101A (en) | 1996-01-09 |
| JPH0747461A (en) | 1995-02-21 |
| EP0618025A1 (en) | 1994-10-05 |
| DE59405931D1 (en) | 1998-06-18 |
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