EP0618025A1 - Injection unit - Google Patents
Injection unit Download PDFInfo
- Publication number
- EP0618025A1 EP0618025A1 EP94103175A EP94103175A EP0618025A1 EP 0618025 A1 EP0618025 A1 EP 0618025A1 EP 94103175 A EP94103175 A EP 94103175A EP 94103175 A EP94103175 A EP 94103175A EP 0618025 A1 EP0618025 A1 EP 0618025A1
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- EP
- European Patent Office
- Prior art keywords
- press
- spindle
- casting
- unit according
- electric motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 238000002347 injection Methods 0.000 title abstract description 6
- 239000007924 injection Substances 0.000 title abstract description 6
- 238000005266 casting Methods 0.000 claims abstract description 54
- 238000004512 die casting Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 9
- 230000001681 protective effect Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 230000009467 reduction Effects 0.000 claims description 2
- 230000004323 axial length Effects 0.000 claims 1
- 230000033001 locomotion Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Classifications
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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 piston for pressing casting material into the shape of the die casting machine.
- Modern press-in units of die casting machines are designed as multi-phase press-in systems, especially three-phase systems.
- a first, slow advance phase the casting piston is moved forward until the casting material is brought to the gate, while in a second phase it is pressed into the mold cavity of the closing part with a short filling time and high injection speed.
- a third phase which is decisive for the quality of the cast products, the die casting is compressed under high pressures.
- the casting piston is connected to a complex hydraulic system which comprises several pressure accumulators and control and regulating devices.
- a press-in unit of this type is known from DE 29 22 914 C2.
- This Binpreßaggregat three pressure accumulators are provided, which are connected to the casting piston cylinder via various lines provided with check, seat and control valves.
- the pressure medium from the first pressure accumulator moves the casting piston from a rest position into one Position in which the casting material is at the gate, whereupon after reversing a seat valve, pressure medium from the second pressure accumulator is guided under high pressure and at high speed onto the casting piston, so that the casting material is quickly shot into the mold.
- a further seat valve upstream of the third pressure accumulator is switched over, so that the pressure present in this third pressure accumulator can be passed on to a multiplier piston and from there using a transmission ratio to the casting piston.
- the casting plunger in its end position thereby puts the casting material already shot into the mold under a very high pressure, as a result of which the quality casting is achieved.
- the various pressure phases are controlled depending on the distance covered by the casting piston. The position of the piston rod of the casting piston must therefore be monitored by separate devices.
- the invention is therefore based on the object of designing a press-in unit of the type mentioned at the outset in such a way that the use of a hydraulic fluid can be dispensed with, but without the prerequisites necessary for the die casting process being impaired.
- At least one electric motor is provided as the drive for the casting piston.
- an electric motor to drive the casting piston, the casting piston movement can be precisely controlled.
- the construction of the press-in unit is simplified since no complex hydraulics are required.
- the use of an environmentally unfriendly hydraulic fluid is avoided.
- the rotary movements of the electric motor can also be used directly to control the casting process.
- 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 driving the press-in unit of a die casting machine if the electric motor drives the casting piston via a spindle or a toothed rack, it being particularly advantageous to provide a ball screw as a spindle. In this embodiment, high propulsion speeds can be achieved at very high pressures, as are required for die casting machines, which was explained at the beginning.
- Another embodiment provides a reduction designed between the electric motor and the casting piston. As a result, different pressures due to different torque forces can also be achieved, so that the drive can also be used with larger machines.
- the electric motor can be a multi-stage electric motor, as a result of which the performance adjustment mentioned at the outset, which is required for the press-in unit of die casting machines, is possible both with regard to the speeds and also with regard to the forces to be generated.
- water cooling can be provided for the electric motor itself if its output needs to be increased.
- the press-in unit (10) shown in FIG. 1 comprises an electric motor (20) which is designed as a two-stage servo motor with two stators (21, 22) arranged within a housing (28) and rotors (23 and 24) associated with these stators.
- the rotors (23, 24) are firmly connected to a nut (25) which is arranged between them and which a thread (26) receives a threaded portion (14) of a ball screw (13).
- the spindle (13) extends coaxially 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), which completely encapsulates the threaded section (14).
- the spindle shaft which is led out of the area of the rotors (23, 24) through the bore (30), extends through an opening (15), provided with a seal (31), in a housing (11) of the casting chamber into the interior ( 12) the same.
- a seal can also be provided on the bore (30).
- the end (13a) of the spindle (13) is connected in the interior (12) of the casting chamber via a coupling (32) to one end of a piston rod (16).
- the casting piston which serves to press the casting material into the mold from the inside of the casting chamber as described above.
- a locking part 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) and thus also the piston rod (16) are set into a longitudinal movement in the sense of the double arrow shown by rotating the nut (25) which is fixedly connected to the rotors (23, 24) of the electric motor (20) .
- the electric motor (20) can be operated at two speed levels using a regulating and control device (27). Its performance can be changed by switching the second stator on or off.
- the electric piston (20) can therefore act on the casting piston both at different speeds and with different forces.
- the spindle (13) is designed as a ball screw. This is clear from the details of Figure 2.
- the power transmission from the electric motor to the casting piston is decisively improved by this configuration.
- the embodiment shown in the drawing shows a two-stage servo motor.
- other electric drives can also be used.
- the threaded portion (14) is equipped according to the principle of a ball screw with a thread of high accuracy, the threads of which have a cross-section adapted for the circulation of balls, which is in a corresponding thread (33) on the inside the mother (25) continues.
- the balls (34) are circulated in the threads of the spindle (13) in the corresponding threads (33) of the nut (25) in a known manner. They leave the threads at point (35) and are led to an entry point (36) via a deflection channel (37), from where they turn during the rotation of the nut (25) caused by the rotary movement of the rotors (23, 24) is triggered, get back into their threads.
- the nut (25), as shown in Figure 2, is composed of two parts, each of which adjoins with a flange (38) and is held in place by a bolt (40), which is held in place by flanges (41), with the interposition of a preload adjuster (39) Rotors (23 and 24) and through the flanges (38) of the two nut parts.
- the nut (25) is rotatably connected to the rotors (23 and 24). If the stators (21 and 22) are therefore acted upon individually or jointly or if the rotors (23 and 24) are appropriately controlled in a likewise known manner, the nut (25) is set into corresponding rotary movements. This rotary movement causes the spindle (13) to move axially in the desired manner, which moves the casting piston.
- the advantage of using an electric motor to drive the casting piston also lies in the advantages already mentioned in the fact that it is not necessary to build up a driving pressure for the casting piston first, as is the case with hydraulic drives, but that the casting piston always has a precisely defined one Power can be set in motion depending on the voltage applied.
- the parameters important for controlling the press-in unit (10) can be easily determined. Since the nut (25) is always connected to the spindle (13), the number of revolutions of the nut (25) or of the rotors (23, 24) clearly indicates the position of the casting piston in the press-in unit. By using a speed sensor, the speed and thus the position of the casting piston can be determined at any time. This can be used for control in a known manner be without special precautions for detecting the position of the casting piston are necessary.
- the press-in unit according to the invention can be used both in hot chamber and 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)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Luminescent Compositions (AREA)
- Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
Abstract
Description
Die Erfindung betrifft ein Einpreßaggregat für eine Druckgießmaschine, mit einem Gießkolben zum Einpressen von Gießmaterial in die Form der Druckgießmaschine.The invention relates to a press-in unit for a die casting machine, with a casting piston for pressing casting material into the shape of the die casting machine.
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 designed as multi-phase press-in systems, especially three-phase systems. In a first, slow advance phase, the casting piston is moved forward until the casting material is brought to the gate, while in a second phase it is pressed into the mold cavity of the closing part with a short filling time and high injection speed. In a third phase, which is decisive for the quality of the cast products, the die casting is compressed under high pressures. To carry out these phases, the casting piston is connected to a complex hydraulic system which comprises several pressure accumulators and control and regulating devices.
Ein Einpreßaggregat dieser Art ist aus der DE 29 22 914 C2 bekannt. Bei diesem Binpreßaggregat 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. This Binpreßaggregat three pressure accumulators are provided, which are connected to the casting piston cylinder via various lines provided with check, seat and control valves. The pressure medium from the first pressure accumulator moves the casting piston from a rest position into one Position in which the casting material is at the gate, whereupon after reversing a seat valve, pressure medium from the second pressure accumulator is guided under high pressure and at high speed onto the casting piston, so that the casting material is quickly shot into the mold. To carry out the third phase, a further seat valve upstream of the third pressure accumulator is switched over, so that the pressure present in this third pressure accumulator can be passed on to a multiplier piston and from there using a transmission ratio to the casting piston. The casting plunger in its end position thereby puts the casting material already shot into the mold under a very high pressure, as a result of which the quality casting is achieved. The various pressure phases are controlled depending on the distance covered by the casting piston. The position of the piston rod of the casting piston must therefore be monitored by separate devices. With these types of construction, it is also to be regarded as a certain disadvantage that, due to the high temperatures in the area of the die casting machines, so-called water glycols are used instead of oil as hydraulic fluid, which are not as flammable as oil, but are environmentally unfriendly and, if seals are damaged, also can affect the health of the operator.
Bei Werkzeugmaschinen, aber auch bei Spindelpressen (siehe Dubbel, Taschenbuch für den Maschinenbau, 14. Auflage, Springer Verlag '81, S. 983 und 984) ist es auch bekannt, als Antriebe Elektromotoren zu verwenden. Dort liegen aber andere Verhältnisse als bei den Einpreßaggregaten für Druckgießmaschinen vor. Dort kann beispielsweise die Zustellbewegung des Preßkopfes mit verhältnismäßig großer Verstellgeschwindigkeit vorgenommen werden. Die Spindel braucht dabei aber keine großen Kräfte aufzubringen. Werden solche großen Kräfte beim Umformvorgang erforderlich, dann laufen die Spindeln relativ langsam. Durch Einschaltung von Getrieben kann daher mit handelsüblichen Elektromotoren gearbeitet werden. Dies ist wegen der erforderlichen Einschießgeschwindigkeiten für das Gießmaterial und wegen der dann auszuübenden hohen Drücke bei Druckgießmaschinen nicht möglich.In machine tools, but also in screw presses (see Dubbel, paperback for mechanical engineering, 14th edition, Springer Verlag '81, p. 983 and 984), it is also known to use electric motors as drives. There, however, the situation is different from that of the press-in units for die casting machines. There, for example, the feed movement of the press head can be carried out with a relatively high adjustment speed. However, the spindle does not need to exert large forces. If such large forces are required during the forming process, the spindles run relatively slowly. By switching on gearboxes, you can therefore use commercially available electric motors be worked. This is not possible because of the required injection speeds for the casting material and because of the high pressures then to be exerted on die casting machines.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Einpreßaggregat der eingangs genannten Art so zu gestalten, daß auf die Verwendung einer Hydraulikflüssigkeit verzichtet werden kann, ohne daß aber die für den Druckgießvorgang notwendigen Voraussetzungen beeinträchtigt werden.The invention is therefore based on the object of designing a press-in unit of the type mentioned at the outset in such a way that the use of a hydraulic fluid can be dispensed with, but without the prerequisites necessary for the die casting process being impaired.
Zur Lösung dieser Aufgabe wird als Antrieb für den Gießkolben wenigstens ein Elektromotor vorgesehen. Durch die Verwendung eines Elektromotors als Antrieb des Gießkolbens, kann die Gießkolbenbewegung 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 der Elektromotor den Gießkolben über eine Spindel oder eine Zahnstange antreibt, wobei es besonders vorteilhaft ist, als Spindel eine Kugelumlaufspindel vorzusehen. Bei dieser Ausgestaltung können große Vortriebsgeschwindigkeiten bei sehr großen Drücken verwirklicht werden, wie sie für Druckgießmaschinen erforderlich sind, was eingangs erläutert wurde.To solve this problem, at least one electric motor is provided as the drive for the casting piston. By using an electric motor to drive the casting piston, the casting piston movement can be precisely controlled. The construction of the press-in unit is simplified since no complex hydraulics are required. The use of an environmentally unfriendly hydraulic fluid is avoided. Finally, the rotary movements of the electric motor can also be used directly to control the casting process. 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 driving the press-in unit of a die casting machine if the electric motor drives the casting piston via a spindle or a toothed rack, it being particularly advantageous to provide a ball screw as a spindle. In this embodiment, high propulsion speeds can be achieved at very high pressures, as are required for die casting machines, which was explained at the beginning.
Der Einsatz eines Elektromotors wird besonders durch die Maßnahmen der Ansprüche 6 bis 8 möglich, durch die der empfindliche Gewindeabschnitt der Spindel, der innerhalb der bei einer Kugelumlaufspindel vorgesehenen Mutter läuft, vollständig abgekapselt und damit nach außen geschützt wird. 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.The use of an electric motor is made possible in particular by the measures of claims 6 to 8, by means of which the sensitive threaded section of the spindle, which runs within the nut provided in a ball screw, is completely encapsulated and thus protected from the outside. The rough one In this way, contaminants that occur in the casting operation and are otherwise difficult to keep away from the drive cannot exert any harmful influence on the drive.
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 provides a reduction designed between the electric motor and the casting piston. As a result, different pressures due to different torque forces can also be achieved, so that the drive can also be used with larger machines.
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 a multi-stage electric motor, as a result of which the performance adjustment mentioned at the outset, which is required for the press-in unit of die casting machines, is possible both with regard to the speeds and also 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 provided for the electric motor itself if its output 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) which is designed as a two-stage servo motor with two stators (21, 22) arranged within a housing (28) and rotors (23 and 24) associated with these stators. The rotors (23, 24) are firmly connected to a nut (25) which is arranged between them and which a thread (26) receives a threaded portion (14) of a ball screw (13). The spindle (13) extends coaxially 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), which completely encapsulates the threaded section (14). Only the smooth shaft of the spindle (13) is tightly led out of a bore (30) on one of the end faces of the rotor housing. The spindle shaft, which is led out of the area of the rotors (23, 24) through the bore (30), extends through an opening (15), provided with a seal (31), in a housing (11) of the casting chamber into the interior ( 12) the same. A seal can also be provided on the bore (30). The end (13a) of the spindle (13) is connected in the interior (12) of the casting chamber via a coupling (32) to one end of a piston rod (16).
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 casting piston, which serves to press the casting material into the mold from the inside of the casting chamber as described above. A locking part 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.To drive the casting piston, the spindle (13) and thus also the piston rod (16) are set into a longitudinal movement in the sense of the double arrow shown by rotating the nut (25) which is fixedly connected to the rotors (23, 24) of the electric motor (20) . The electric motor (20) can be operated at two speed levels using a regulating and control device (27). Its performance can be changed by switching the second stator on or off. The electric piston (20) can therefore act on the casting piston both at different speeds and with different forces. In this way it is possible to achieve the phases of movement and pressure exerted on the casting piston that are important for the press-in process even when using an electric motor, without - because of the encapsulation of the threaded section (14) of the spindle (13) - adverse influences such as the high casting temperature or contamination can act on the drive.
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. The power transmission from the electric motor to the casting piston is decisively improved by this configuration.
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 a two-stage servo motor. However, other electric drives can also be used. Furthermore, it is conceivable to connect two or more electric motors with different gear ratios 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.From Figure 2 it can be seen that the threaded portion (14) is equipped according to the principle of a ball screw with a thread of high accuracy, the threads of which have a cross-section adapted for the circulation of balls, which is in a corresponding thread (33) on the inside the mother (25) continues. The balls (34) are circulated in the threads of the spindle (13) in the corresponding threads (33) of the nut (25) in a known manner. They leave the threads at point (35) and are led to an entry point (36) via a deflection channel (37), from where they turn during the rotation of the nut (25) caused by the rotary movement of the rotors (23, 24) is triggered, get back into their threads. These balls (34) create a positive engagement between the nut (25) on the one hand and the spindle (13) on the other. The nut (25), as shown in Figure 2, is composed of two parts, each of which adjoins with a flange (38) and is held in place by a bolt (40), which is held in place by flanges (41), with the interposition of a preload adjuster (39) Rotors (23 and 24) and through the flanges (38) of the two nut parts.
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 rotatably connected to the rotors (23 and 24). If the stators (21 and 22) are therefore acted upon individually or jointly or if the rotors (23 and 24) are appropriately controlled in a likewise known manner, the nut (25) is set into corresponding rotary movements. This rotary movement causes the spindle (13) to move axially in the desired manner, which moves the casting piston.
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 is obvious that, depending on the design of the electric drive with the arrangement shown, when selecting high speeds, very high feed speeds for the casting piston can also be achieved. By interconnecting several stators and / or rotors, correspondingly high torques can also be achieved, which can also achieve the high pressures required for 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 to drive the casting piston also lies in the advantages already mentioned in the fact that it is not necessary to build up a driving pressure for the casting piston first, as is the case with hydraulic drives, but that the casting piston always has a precisely defined one Power can be set in motion depending on the voltage applied. In addition, the parameters important for controlling the press-in unit (10) can be easily determined. Since the nut (25) is always connected to the spindle (13), the number of revolutions of the nut (25) or of the rotors (23, 24) clearly indicates the position of the casting piston in the press-in unit. By using a speed sensor, the speed and thus the position of the casting piston can be determined at any time. This can be used for control in a known manner be without special precautions for detecting the position 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 hot chamber and in cold chamber casting machines.
Claims (12)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4310310A DE4310310A1 (en) | 1993-03-30 | 1993-03-30 | Press-in unit |
| DE4310310 | 1993-03-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0618025A1 true EP0618025A1 (en) | 1994-10-05 |
| EP0618025B1 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) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1057560A1 (en) * | 1999-06-01 | 2000-12-06 | Oskar Frech Gmbh & Co. | Injection unit for a pressure diecasting machine |
| CN117267285A (en) * | 2023-11-21 | 2023-12-22 | 山西汤荣机械制造股份有限公司 | Brake drum convenient to heat dissipation and casting device thereof |
Families Citing this family (8)
| 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 |
| EP1044743B1 (en) * | 1999-04-13 | 2003-08-06 | Oskar Frech Gmbh & Co. | Hot chamber die casting machine |
| DE50009878D1 (en) * | 2000-10-27 | 2005-04-28 | Frech Oskar Gmbh & Co Kg | Hot chamber die casting machine and method of operation therefor |
| DE50201470D1 (en) * | 2001-04-19 | 2004-12-09 | Demag Ergotech Gmbh | INJECTION MOLDING MACHINE WITH ELECTROMOTIC SPINDLE DRIVE AND SPRING MEMORY SUPPORT TO SUPPORT 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 |
Citations (4)
| 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 |
| WO1991006415A1 (en) * | 1989-11-06 | 1991-05-16 | Cincinnati Milacron Inc. | Mold clamping system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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
Patent Citations (4)
| 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 |
| WO1991006415A1 (en) * | 1989-11-06 | 1991-05-16 | Cincinnati Milacron Inc. | Mold clamping system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1057560A1 (en) * | 1999-06-01 | 2000-12-06 | Oskar Frech Gmbh & Co. | Injection unit for a pressure diecasting machine |
| WO2000072998A1 (en) * | 1999-06-01 | 2000-12-07 | Oskar Frech Gmbh + Co. | Injection unit for a pressure die casting machine |
| US6581670B1 (en) | 1999-06-01 | 2003-06-24 | Oskar Frech Gmbh & Co. | Injection unit for a pressure die casting machine |
| CZ300224B6 (en) * | 1999-06-01 | 2009-03-25 | Oskar Frech Gmbh + Co. | Injection unit for a pressure die-casting machine |
| CN117267285A (en) * | 2023-11-21 | 2023-12-22 | 山西汤荣机械制造股份有限公司 | Brake drum convenient to heat dissipation and casting device thereof |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2117163T3 (en) | 1998-08-01 |
| DE4310310A1 (en) | 1994-10-06 |
| ATE166010T1 (en) | 1998-05-15 |
| JPH0747461A (en) | 1995-02-21 |
| US5482101A (en) | 1996-01-09 |
| EP0618025B1 (en) | 1998-05-13 |
| JP3348958B2 (en) | 2002-11-20 |
| DE59405931D1 (en) | 1998-06-18 |
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