EP2295171B1 - Method and hydraulic switching assembly for operating a metal pressure casting assembly - Google Patents

Method and hydraulic switching assembly for operating a metal pressure casting assembly Download PDF

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Publication number
EP2295171B1
EP2295171B1 EP10009266A EP10009266A EP2295171B1 EP 2295171 B1 EP2295171 B1 EP 2295171B1 EP 10009266 A EP10009266 A EP 10009266A EP 10009266 A EP10009266 A EP 10009266A EP 2295171 B1 EP2295171 B1 EP 2295171B1
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Prior art keywords
piston
filling cylinder
space
rod
accumulator
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EP10009266A
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German (de)
French (fr)
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EP2295171A1 (en
Inventor
Richard Oberle
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Parker Hannifin Manufacturing Germany GmbH and Co KG
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Individual
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Priority to SI201030132T priority Critical patent/SI2295171T1/en
Priority to PL10009266T priority patent/PL2295171T3/en
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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
    • B22D17/203—Injection pistons
    • 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
    • B22D17/2053—Means for forcing the molten metal into the die using two or more cooperating injection pistons
    • 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
    • B22D17/32—Controlling equipment

Definitions

  • the invention relates to a method for operating a metal die-casting plant and to a hydraulic circuit arrangement suitable and provided for carrying out the method.
  • the liquid metal is first introduced by means of a feeder in the actual mold cavity upstream Guchichse, then spent from the Guchichse in the mold cavity and held there under pressure until the hot metal has cooled so far that the produced diecast part can be removed from the mold cavity.
  • a filling cylinder is used in a conventional manner first, which is designed as a working cylinder with a piston having a one-sided piston rod, wherein the piston rod of the corresponding proceeding piston brings about the promotion of the liquid metal in Guchse and mold cavity.
  • the liquid metal is pushed together in the stuffing box up to the height of the mold gate and at the same time the filling opening is closed, which takes place by means of a slow advancing movement of the piston of the filling cylinder.
  • Driving speed of the piston or the associated piston rod in the order of 0.01 - 0.5 m / s.
  • To drive the piston of the filling cylinder is filled with fluid and under a set pressure accumulator, which is connected to the piston chamber of the filling cylinder.
  • the liquid metal in it is pressed into the mold cavity in a second phase of the high feed rate of the piston of the stuffing cylinder to ensure complete filling of the mold cavity and avoid the formation of air bubbles therein.
  • the driving speed of the piston in the charging cylinder is increased to a speed of about 3 to 9 m / s over a short period of perhaps 50 to 80 ms.
  • This increase in the driving speed is brought about by the opening of a correspondingly large-sized valve, wherein the desired vehicle speed is controlled via the valve opening point.
  • This valve can be arranged both in the inlet between the battery and the filling cylinder and in the discharge from the filling cylinder. The displaced during the forward travel of the piston in the filling cylinder during the first and second phase of the process from the rod space fluid is discharged in the known method to the tank.
  • a multiplier is provided, which is also designed as a working cylinder with a one-sided piston rod having piston, the piston rod enters the piston chamber of the filling cylinder and thus generates a correspondingly high pressure in the filling cylinder.
  • the rod space of the multiplier can be connected to the tank via a pressure regulating valve in order to be able to set the degree of multiplication of the pressure in the multiplier by adjusting the pressure in the rod space.
  • a method with the generic features is known from US 5,662,159 A known.
  • the hydraulic circuit described therein allows a controlled derivative of the displaced during the advancing movement of the piston in the filling cylinder from the rod space fluids to the tank, thereby regulating the speed of the piston travel.
  • the amount of fluid to be introduced for the advancing movement of the piston into the piston chamber of the filling cylinder is supplied by a pressure source, for example in the form of a pump, with the addition of a pressurized fluid-containing accumulator.
  • the battery is in turn recharged after draining by supplying fluid from the pressure source.
  • the invention has for its object to improve a method of the type mentioned so that in particular the necessary for the implementation of the process energy budget is made more efficient. Further should be given a suitable for carrying out the improved method hydraulic circuitry for the components involved.
  • the invention provides in its basic idea that the displaced in the first phase during the slow advancing movement of the piston in the filling cylinder from the rod space fluid fed back via a switched into a first position control valve with associated line connection while maintaining the pending in the rod space pressure in the battery is, and during the second phase for moving the liquid metal from the Grehüchse in the mold cavity displaced by the rapid advancing movement of the piston from the rod space of the filling cylinder selectively fed via the switched to a second position control valve with associated line connection to a pressure booster in the Pressure intensifier brought to the pressure prevailing in the battery high pressure and then initiated by the pressure booster via a line connection in the high-pressure battery, or via the switched to a third position control valve with ordneter line pre-bond is fed back into the piston chamber of the filling cylinder, and wherein during a cooling phase in a fourth position of the control valve, the rod space of the filling cylinder is depressurized via a line to the tank.
  • the invention has the advantage that the displaced during the slow travel of the piston in the filling cylinder fluid is returned to the battery and thereby for the continuous drive of the filling cylinder or an additional multiplier connected in parallel usable. As a result, in particular the amount of fluid required in the system can be significantly reduced. As far as in the second phase of the process, the piston of the filling cylinder moves up at a fast speed, which at very high speed and lower insertion force from the rod space of the filling cylinder displaced fluid either via the control valve in the Piston space of the filling cylinder fed back and thus be used for the further drive of the filling cylinder.
  • a second possibility is to lead the fluid through a pressure booster to bring in the pressure booster, the pressure on the pressure prevailing in the battery high pressure and then expel the fluid from the pressure booster via a line connection to the connected battery. Again, this is a use of kinetic energy connected.
  • the process according to the invention not only reduces the amount of fluid in the system, but also avoids the occurrence of cavitation or excessive pressure peaks.
  • the hydraulic fluid is returned from the charging cylinder without trapping air and at low speed to the central battery.
  • the pressure in the rod space of the multiplier is adjusted by means of a valve assembly at the level of the pending pressure in the battery, so that because of the pressure balance of rod space and piston space of the multiplier no movement of the piston of the multiplier is given. Accordingly, it can be provided that via the associated valve of the pending pressure in the accumulator is also set in the rod space of the multiplier, so that rod space and piston chamber of the multiplier are pressure balanced. Alternatively it can also be provided that the rod space of the multiplier is shut off by means of the valve.
  • the piston of the filling cylinder during the cooling phase or the multiplication phase is provided during this phase to depressurize the rod space of the filling cylinder via the control valve with associated line connection to the tank, so that the movements of the piston during the cooling phase no resistance is opposite.
  • the associated, in the tank derived amounts of fluid are low.
  • the invention provides that after the end of the cooling phase, the connection between the battery on the one hand and filling cylinder and multiplier on the other hand interrupted and in the filling cylinder piston side under high pressure fluid means a downstream valve assembly is returned to the battery.
  • a corresponding use of the corresponding energy level is connected.
  • a suitable for carrying out the method hydraulic circuitry consists in a conventional manner of a pump, a tank and a connected thereto by means of control valves hydraulic control circuit for supplying a working cylinder with a a one-sided piston rod having piston formed filling cylinder, wherein connected to the control circuit connected to the piston chamber of the filling cylinder with the interposition of a switching valve battery.
  • a control valve is connected by means of which in the advancing movement of the piston in the filling cylinder displaced from the rod space fluid either the battery, in turn to the Battery connected pressure intensifier, the piston chamber of the filling cylinder and the tank is zuleitbar.
  • a connection of the control valve controlling the outflow of the fluid displaced from the rod space of the filling cylinder is connected directly to the battery via a line and into the reservoir Line a check valve is turned on with a directed towards the battery passage direction.
  • a connection of the outflow of the displaced from the rod chamber of the filling fluid fluid control Control valve connected via a line to the piston chamber of the designed as a piston with one-sided piston rod having working cylinder pressure booster and the rod side of the pressure booster is connected via a line to the battery.
  • the area ratios on the piston can be designed with piston rod of the pressure booster hinged on one side such that the pressure generated in its rod space by supplying the fluid displaced from the filling cylinder in its piston chamber corresponds to the pressure generated when the pressure booster is connected to the battery. Accordingly, it can be provided that in the of Rod space of the pressure booster to the battery leading line a check valve is turned on with a direction of the battery direction of passage.
  • an embodiment of the invention provides that a connection of the outflow of the displaced from the rod chamber of the filling fluid fluid control valve over a line is connected to the piston chamber of the filling cylinder.
  • a connection of the control valve controlling the outflow of the fluid displaced from the rod space of the filling cylinder is connected to the tank;
  • the rod space of the filling cylinder should be depressurized during the cooling phase of the metal in the mold cavity.
  • a multiplier designed as a piston with a one-sided piston rod is arranged in a hydraulic parallel connection to the filling cylinder, wherein the Piston rod of the multiplier in the piston chamber of the filling cylinder for pressure amplification retracts, wherein the piston chamber of the multiplier connected to the battery and the rod space of the multiplier with the interposition of a valve by means of a pressure control valve is optionally connectable to the battery or the tank.
  • the filling cylinder, the multiplier and the pressure booster are each returned to their original position;
  • rod space and piston chamber of Filling cylinder, multiplier and pressure booster for the return stroke of each piston arranged therein by means of at least one associated control valve to the pump and / or tank can be connected.
  • FIGURE shows a schematic hydraulic circuit diagram for the components provided for carrying out the method.
  • a die 10 having a mold cavity 11 disposed therein is used to be filled with the hot liquid metal.
  • the mold cavity 11 is a Brownbüchse 12 upstream.
  • a filling cylinder 13 is provided, which is designed as a working cylinder of known design with a piston 14 and one-sided piston rod 15, wherein the piston rod 15 is arranged for retraction into the Artbüchse to the same by means of the piston movement in the Artbüchse 12 filled metal in the mold cavity 11 Vietnameseschieben.
  • the piston 14 divides the filling cylinder 13 into a piston chamber 16 and into a rod space 17.
  • a multiplier 18 associated with, also as a Working cylinder with piston 19 and unilaterally acting piston rod 20 is formed, wherein the piston rod 20 of the multiplier 18 is arranged for retraction into the piston chamber 16 of the filling cylinder 13.
  • the piston 19 of the multiplier 18 divides the cylinder interior into a piston chamber 21 and a rod space 22.
  • a battery 23 is provided, which is filled by a pump 24 via a line 25 each with fluid, wherein in the line 25, a check valve 26 with a to Battery directed forward direction is turned on to allow the filling of the battery 23 by the pump 24, but in the opposite direction to prevent backflow of the fluid from the battery 23 in the direction of the pump 24.
  • a line 27 in which a valve 28 is turned on.
  • the line 27 branches into a leading to the filling cylinder 13 line 27a and a multiplier 18 leading line 27b, both lines 27a and 27b respectively to the piston chamber 16 and 21 of the filling cylinder 13 and multiplier 18 are connected so that the outflow of fluid from the battery 23 for pushing out of the respective pistons 14 and 19 with connected piston rod 15 and 21 provides.
  • a check valve 29 is turned on with a directed to the filling cylinder 13 passage direction, whose function will be explained later.
  • a line 31 leads from the rod space 17 of the filling cylinder 13 to a control valve 30 with a plurality of connections 32, 34, 41 and 44.
  • a first port 32 connects the control valve 30 to a tank 50, so that with a corresponding position of the control valve 30, the rod space 17 of the filling cylinder 13 to the tank 50 can be relieved.
  • a second connection 34 of the control valve 30 is connected by means of a line 60 to a pressure booster 61.
  • This pressure intensifier 61 is designed as a piston 35 with one-sided hinged piston rod 36 trained working cylinder, wherein the piston 35, the interior of the Pressure translator 61 into a piston chamber 37 and a rod space 38 divided.
  • a line 39 leads to the battery 23, in which a check valve 40 is turned on with a directed toward the battery 23 toward the direction of passage.
  • Another connection 41 of the control valve 30 is connected via a line 42 to the battery 23, wherein in this line 42, a check valve 43 is turned on with a battery 23 directed to the passage opening.
  • a fourth connection 44 of the control valve 30 is connected via a line 45 directly to the piston chamber 16 of the filling cylinder 13.
  • a line 46 to a valve 47 and a downstream pressure control valve 48th leads. From the pressure control valve 48, a line 49 leads to the battery 23.
  • the pressure control valve 48 has a connection to the tank 50, so that the fluid displaced from the rod space 22 of the multiplier 18 can be diverted to the tank 50.
  • the piston chamber 16 of the filling cylinder 13 must first be relieved with the therein under a high, multiplied by the multiplier 18 multiplied pressure pending fluid, and this is the piston chamber 16 via a line connection 52 and 70 with a valve 28 a therein with the Battery 23 connectable, so that the pressurized fluid can be recycled into the battery 23.
  • the pump 24 is a Control valve 51 connected downstream, which is to be connected via a connection to the tank 50.
  • the outgoing of the control valve 51 lines lead with the line 52 to the piston chamber 16 of the filling cylinder 13 and the line 53 to the rod space 17 of the filling cylinder 13.
  • appropriate circuit of the control valve 51 can thus by acting on the rod chamber 17 by pump 24 funded fluid the piston 14 are moved back to its initial position, wherein the displaced from the piston chamber 16 fluid via the line 52 and the control valve 51 flows to the tank 50.
  • the pressure intensifier 61 a corresponding control valve 51 is provided with connection to the pump 24 and the tank 50, wherein the control valve 51 are connected by means of respective lines 54 and 55 with the piston chamber 37 and the rod chamber 38 of the pressure booster 61. In this way, a reset of the pressure booster 61 is also given here.
  • the valve 28 is moved to its open position so that fluid 23 can flow from the accumulator 23 via the line 27 or 27a and 27b into the respective piston chamber 16 or 21 of the filling cylinder 13 and multiplier 18. Due to the regulation of the fluid flow in the valve 28, the Speed of the process of the piston 14 in the filling cylinder 13 for filling the Basüchse 12 are regulated. As far as the piston chamber 21 of the multiplier 18 is also acted upon with fluid, at this time via the valve assembly 47, 48 of the rod space 22 of the multiplier 18 pending pressure is maintained at the level of waiting in the battery 23 pressure, so that at a pressure balance of rod space 22 and piston chamber 21 no movement of the piston 19 in the multiplier 18 takes place.
  • control valve 30 is in a position in which the port 41 is in communication with the leading out of the rod chamber 17 of the filling cylinder 13 line 31, so that the displaced during the forward movement of the piston 14 fluid via the control valve 30 and the Terminal 41 and the further line 42 is returned to the battery 23, wherein the check valve 43 allows this backflow.
  • valve 30 can also be brought into a position in which its terminal 44 is connected to the rod space 17 of the filling cylinder 13, so that displaced from the rod space 17 Fluid via the port 44 and the subsequent line 45 to the piston chamber 16 of the filling cylinder 13 are passed and here can support the drive movement for the piston 14.
  • the valve 28 is placed in the line 27 in a low open position during this short period of time, so that the piston chamber 16 of the filling cylinder 13 only with a small Quantity fluid is applied.
  • the control valve 30 is again brought into a position in which its connection 41 establishes a connection between the rod space 17 of the filling cylinder 13 and the line leading to the battery 23, so that the fluid ejected from the rod space 17 of the filling cylinder 13 enters the accumulator 23 is fed back.
  • the filling cylinder 13 is to be acted upon by a correspondingly high pressure and held in a holding position, 28 fluid is introduced into the piston chamber 21 of the multiplier 18 via a further opening of the valve, so that due to the cross-sectional conditions of the piston side and rod side Here, too, a correspondingly higher pressure for acting on the filling cylinder 13 is brought.
  • the pressure in the rod space 22 of the multiplier 18 was set to the pressure prevailing in the battery 23, now takes place in the valve 47, a reduction of the pressure to a lower value, wherein the height of the bias voltage as a result of multiplied by the multiplier 18 in the piston chamber 16 of the filling cylinder 13 determines or sets pressure.
  • the piston 19 of the multiplier 18 moves in the direction of the filling cylinder 13, so that corresponding fluid is displaced from the rod space 22 of the multiplier 18. This fluid is discharged via the valves 47 and 48 to the tank 50.
  • the valve 47 has a dual function during the process.
  • the fluid is fed via the line 52 and the line 25 switched connection line 70 with a valve disposed therein 28a in the leading to the battery line 23 25th , so that the excess energy in the form of fluid can also be used by feeding back into the battery 23.
  • the fluid present in the piston chamber 16 also acts on the piston rod 20 of the multiplier 18 and thereby likewise ensures a retraction of the piston 19, wherein the fluid displaced from the piston chamber 21 over the Lines 27b, 27a and 52 to the control valve 51 and thus to the connected tank 50 is returned.
  • the check valve 29 allows a return of the displaced from the piston chamber 21 of the multiplier 18 fluid to the control valve 51, while blocking fluid flow in the opposite direction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Betreiben einer Metalldruckgussanlage sowie eine zur Durchführung des Verfahrens geeignete und vorgesehene hydraulische Schaltungsanordnung.The invention relates to a method for operating a metal die-casting plant and to a hydraulic circuit arrangement suitable and provided for carrying out the method.

Bei durch Benutzung bekannt gewordenen Metalldruckgussverfahren wird das flüssige Metall zunächst mittels einer Zuführeinrichtung in eine dem eigentlichen Formhohlraum vorgeschaltete Füllbüchse eingefüllt, anschließend aus der Füllbüchse in den Formhohlraum verbracht und dort unter Druckausübung gehalten, bis das heiße Metall soweit abgekühlt ist, dass das hergestellte Druckgussteil aus dem Formhohlraum entnommen werden kann. Im Rahmen des Verfahrens kommt in an sich bekannter Weise zunächst ein Füllzylinder zum Einsatz, der als Arbeitszylinder mit einem eine einseitige Kolbenstange aufweisenden Kolben ausgebildet ist, wobei die Kolbenstange des entsprechend verfahrenden Kolbens die Förderung des flüssigen Metalls in Füllbüchse und Formhohlraum herbeiführt.When become known by use metal die casting method, the liquid metal is first introduced by means of a feeder in the actual mold cavity upstream Füllbüchse, then spent from the Füllbüchse in the mold cavity and held there under pressure until the hot metal has cooled so far that the produced diecast part can be removed from the mold cavity. As part of the process, a filling cylinder is used in a conventional manner first, which is designed as a working cylinder with a piston having a one-sided piston rod, wherein the piston rod of the corresponding proceeding piston brings about the promotion of the liquid metal in Füllbüchse and mold cavity.

So wird in einer ersten Phase des Verfahrens das flüssige Metall in der Füllbüchse bis zur Höhe des Formanschnittes zusammengeschoben und gleichzeitig die Einfüllöffnung verschlossen, was mittels einer langsamen Vorschubbewegung des Kolbens des Füllzylinders erfolgt. Hierbei liegt die Fahrgeschwindigkeit des Kolbens beziehungsweise der mit diesem verbundenen Kolbenstange in der Größenordnung von 0,01 - 0,5 m/s. Zum Antrieb des Kolbens des Füllzylinders dient ein mit Fluid gefüllter und unter einem eingestellten Druck stehender Akku, der mit dem Kolbenraum des Füllzylinders verbunden ist. Nach dem Füllen der Füllbüchse wird das darin anstehende flüssige Metall in einer zweiten Phase des Verfahrens mit hoher Vorschubgeschwindigkeit des Kolbens des Füllzylinders in den Formhohlraum gepresst, um die vollständige Füllung des Formhohlraumes zu gewährleisten und das Entstehen von Luftblasen darin zu vermeiden. Hierzu wird die Fahrgeschwindigkeit des Kolbens im Füllzylinder auf eine Geschwindigkeit von etwa 3 bis 9 m/s über einen kurzen Zeitraum von vielleicht 50 bis 80 ms erhöht. Diese Erhöhung der Fahrgeschwindigkeit wird herbeigeführt durch das Öffnen eines entsprechend groß dimensionierten Ventils, wobei über den Ventilöffnungspunkt die gewünschte Fahrgeschwindigkeit kontrolliert wird. Dieses Ventil kann sowohl im Zulauf zwischen dem Akku und dem Füllzylinder als auch im Ablauf aus dem Füllzylinder angeordnet sein. Das bei der Vorwärtsfahrt des Kolbens im Füllzylinder während der ersten und zweiten Phase des Verfahrens aus dessen Stangenraum verdrängte Fluid wird bei dem bekannten Verfahren zum Tank abgeleitet.Thus, in a first phase of the process, the liquid metal is pushed together in the stuffing box up to the height of the mold gate and at the same time the filling opening is closed, which takes place by means of a slow advancing movement of the piston of the filling cylinder. Here lies the Driving speed of the piston or the associated piston rod in the order of 0.01 - 0.5 m / s. To drive the piston of the filling cylinder is filled with fluid and under a set pressure accumulator, which is connected to the piston chamber of the filling cylinder. After filling the stuffing box, the liquid metal in it is pressed into the mold cavity in a second phase of the high feed rate of the piston of the stuffing cylinder to ensure complete filling of the mold cavity and avoid the formation of air bubbles therein. For this purpose, the driving speed of the piston in the charging cylinder is increased to a speed of about 3 to 9 m / s over a short period of perhaps 50 to 80 ms. This increase in the driving speed is brought about by the opening of a correspondingly large-sized valve, wherein the desired vehicle speed is controlled via the valve opening point. This valve can be arranged both in the inlet between the battery and the filling cylinder and in the discharge from the filling cylinder. The displaced during the forward travel of the piston in the filling cylinder during the first and second phase of the process from the rod space fluid is discharged in the known method to the tank.

Während der anschließenden Abkühlphase des im Formhohlraum anstehenden heißen Metalls wird der Füllzylinder unter einem entsprechend hohen Druck gehalten, damit die Schrumpfung des sich abkühlenden Metalls durch Nachdrücken des Kolbens des Füllzylinders ausgeglichen wird. Zu dieser Druckmultiplikation ist ein Multiplikator vorgesehen, der ebenfalls als Arbeitszylinder mit einem eine einseitige Kolbenstange aufweisenden Kolben ausgebildet ist, dessen Kolbenstange in den Kolbenraum des Füllzylinders einfährt und somit einen entsprechend hohen Druck im Füllzylinder erzeugt. Der Stangenraum des Multiplikators ist über ein Druckregelventil mit dem Tank verbindbar, um durch Einstellung des Drucks im Stangenraum den Grad der Multiplikation des Drucks im Multiplikator einstellen zu können.During the subsequent cooling phase of the hot metal present in the mold cavity, the filling cylinder is kept under a correspondingly high pressure, so that the shrinkage of the cooling metal is compensated by forcing the piston of the filling cylinder. For this pressure multiplication, a multiplier is provided, which is also designed as a working cylinder with a one-sided piston rod having piston, the piston rod enters the piston chamber of the filling cylinder and thus generates a correspondingly high pressure in the filling cylinder. The rod space of the multiplier can be connected to the tank via a pressure regulating valve in order to be able to set the degree of multiplication of the pressure in the multiplier by adjusting the pressure in the rod space.

Mit dem bekannten Verfahren ist eine Reihe von Nachteilen verbunden. Da zu Beginn der langsamen Vorschubbewegung des Kolbens im Füllzylinder einerseits der im Akku anstehende eingestellte Druck auf den Kolben wirkt und andererseits die Verbindung vom Stangenraum des Füllzylinders zum Tank geöffnet wird, wird der im Stangenraum des Füllzylinders anstehende Druck schlagartig zum Tank entleert. Dies führt dazu, dass die Kolbenbewegung mit einem entsprechenden Anfahrsprung beginnt, und dieser überträgt sich auf das zu fördernde flüssige Metall und führt dort zu einer leichten Wellenbildung und/oder Lufteinschlüssen. Da weiterhin bei Metalldruckgussanlagen häufig großvolumige Füllzylinder zum Einsatz kommen, sind erhebliche Fluidmengen im System erforderlich, um die Vorschubbewegung des Kolbens im Füllzylinder zu bewirken; entsprechend große Fluidmengen werden dabei ungenutzt zum Tank abgeführt beziehungsweise müssen dem Kolbenraum des Füllzylinders zugeführt werden.A number of disadvantages are associated with the known method. Since at the beginning of the slow feed movement of the piston in the filling cylinder on the one hand, the set in the battery set pressure acts on the piston and on the other hand the connection from the rod space of the filling cylinder is opened to the tank, the pressure in the rod space of the filling cylinder abruptly to the tank is emptied. As a result, the piston movement begins with a corresponding start-up jump, and this transfers to the liquid metal to be conveyed, where it leads to a slight wave formation and / or air inclusions. Since large-volume filling cylinders are frequently used in metal die casting plants, considerable amounts of fluid in the system are required to effect the advancing movement of the piston in the filling cylinder; correspondingly large amounts of fluid are discharged unused to the tank or must be supplied to the piston chamber of the filling cylinder.

Ein weiterer Nachteil besteht darin, dass am Ende der zweiten Phase mit hoher Vorschubgeschwindigkeit des Kolbens im Füllzylinder der Kolben aus seiner schnellen Fahrt schlagartig abgebremst wird, wenn der Formhohlraum gefüllt ist. Da der Stangenraum des Füllzylinders auch während dieser Phase mit dem Tank verbunden ist, kommt es dadurch zu einer Kavitation im Stangenraum und der daran anschließenden, zum Tank führenden Leitung mit der Folge des Auftretens von sehr hohen Druckspitzen, die die Lebensdauer der eingesetzten Steuerventile stark beeinträchtigen können.Another disadvantage is that at the end of the second phase with a high feed rate of the piston in the filling cylinder, the piston is braked abruptly from its fast ride when the mold cavity is filled. Since the rod space of the filling cylinder is also connected to the tank during this phase, this leads to cavitation in the rod space and the adjoining, leading to the tank line with the result of the occurrence of very high pressure peaks, which greatly affect the life of the control valves used can.

Insgesamt ist demnach das bekannte Verfahren energetisch ungünstig und führt auch zu einer Überbeanspruchung der eingesetzten mechanischen Komponenten.Overall, therefore, the known method is energetically unfavorable and also leads to an overuse of the mechanical components used.

Ein Verfahren mit den gattungsgemäßen Merkmalen ist aus der US 5,662,159 A bekannt. Die darin beschriebene hydraulische Schaltung ermöglicht eine kontrollierte Ableitung des bei der Vorschubbewegung des Kolbens im Füllzylinder aus dessen Stangenraum verdrängten Fluids zum Tank, um dadurch die Geschwindigkeit der Kolbenfahrt zu regeln. Die für die Vorschubbewegung des Kolbens in den Kolbenraum des Füllzylinders einzuleitende Fluidmenge wird von einer Druckquelle, beispielsweise in Form einer Pumpe, geliefert, wobei zusätzlich auch ein unter Druck stehendes Fluid beinhaltender Akku aufgeschaltet werden kann. Der Akku wird seinerseits nach Entleerung durch Einspeisung von Fluid von der Druckquelle wieder aufgeladen.A method with the generic features is known from US 5,662,159 A known. The hydraulic circuit described therein allows a controlled derivative of the displaced during the advancing movement of the piston in the filling cylinder from the rod space fluids to the tank, thereby regulating the speed of the piston travel. The amount of fluid to be introduced for the advancing movement of the piston into the piston chamber of the filling cylinder is supplied by a pressure source, for example in the form of a pump, with the addition of a pressurized fluid-containing accumulator. The battery is in turn recharged after draining by supplying fluid from the pressure source.

Weiterhin ist es aus der US 2007/267,166 A1 bekannt, das bei der Vorschubbewegung eines Kolbens in einem Füllzylinder aus dessen Stangenraum verdrängte Fluid in den Kolbenraum des Füllzylinders zurückzuspeisen und somit die erforderliche Versorgung des Kolbenraumes mit Fluid zu reduzieren.Furthermore, it is from the US 2007 / 267,166 A1 known to feed back the displaced fluid in the piston chamber of the filling cylinder during the advancing movement of a piston in a filling cylinder from the rod space and thus to reduce the required supply of the piston chamber with fluid.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art so zu verbessern, dass insbesondere der für die Durchführung des Verfahrens notwendige Energiehaushalt effizienter gestaltet ist. Weiter soll eine zur Durchführung des verbesserten Verfahrens geeignete hydraulische Schaltungsanordnung für die beteiligten Komponenten angegeben werden.The invention has for its object to improve a method of the type mentioned so that in particular the necessary for the implementation of the process energy budget is made more efficient. Further should be given a suitable for carrying out the improved method hydraulic circuitry for the components involved.

Die Lösung dieser Aufgabe ergibt sich einschließlich vorteilhafter Ausgestaltungen und Weiterbildungen der Erfindung aus dem Inhalt der Patentansprüche, welche dieser Beschreibung nachgestellt sind.The solution to this problem arises, including advantageous refinements and developments of the invention from the content of the claims, which are adjusted to this description.

Die Erfindung sieht in ihrem Grundgedanken vor, dass das in der ersten Phase bei der langsamen Vorschubbewegung des Kolbens in dem Füllzylinder aus dessen Stangenraum verdrängte Fluid über ein in eine erste Stellung geschaltetes Steuerventil mit zugeordneter Leitungsverbindung unter Beibehaltung des im Stangenraum anstehenden Drucks in den Akku zurückgespeist wird, und während der zweiten Phase zum Verbringen des flüssigen Metalls aus der Füllbüchse in den Formhohlraum das durch die schnelle Vorschubbewegung des Kolbens aus dem Stangenraum des Füllzylinders verdrängte Fluid wahlweise über das in eine zweite Stellung geschaltete Steuerventil mit zugeordneter Leitungsverbindung einem Druckübersetzer zugeleitet, in dem Druckübersetzer auf den im Akku herrschenden Hochdruck gebracht und anschließend vom Druckübersetzer über eine Leitungsverbindung in den unter Hochdruck stehenden Akku eingeleitet wird, oder über das in eine dritte Stellung geschaltete Steuerventil mit zugeordneter Leitungsvorbindung in den Kolbenraum des Füllzylinders rückgespeist wird, und wobei während einer Abkühlphase in einer vierten Stellung des Steuerventils der Stangenraum des Füllzylinders über eine Leitung zum Tank drucklos gestellt ist.The invention provides in its basic idea that the displaced in the first phase during the slow advancing movement of the piston in the filling cylinder from the rod space fluid fed back via a switched into a first position control valve with associated line connection while maintaining the pending in the rod space pressure in the battery is, and during the second phase for moving the liquid metal from the Füllhüchse in the mold cavity displaced by the rapid advancing movement of the piston from the rod space of the filling cylinder selectively fed via the switched to a second position control valve with associated line connection to a pressure booster in the Pressure intensifier brought to the pressure prevailing in the battery high pressure and then initiated by the pressure booster via a line connection in the high-pressure battery, or via the switched to a third position control valve with ordneter line pre-bond is fed back into the piston chamber of the filling cylinder, and wherein during a cooling phase in a fourth position of the control valve, the rod space of the filling cylinder is depressurized via a line to the tank.

Mit der Erfindung ist der Vorteil verbunden, dass das während der langsamen Fahrt des Kolbens im Füllzylinder verdrängte Fluid zum Akku zurückgeführt wird und dadurch für den fortdauernden Antrieb des Füllzylinders beziehungsweise eines dazu parallel geschalteten zusätzlichen Multiplikators nutzbar ist. Hierdurch kann insbesondere die im System benötigte Menge an Fluid deutlich reduziert werden. Soweit in der zweiten Phase des Verfahrens der Kolben des Füllzylinders mit schneller Fahrt vorfährt, kann das bei sehr hoher Geschwindigkeit und geringerer Einpresskraft aus dem Stangenraum des Füllzylinders verdrängte Fluid entweder über das Steuerventil in den Kolbenraum des Füllzylinders zurückgespeist und damit für den weiteren Antrieb des Füllzylinders genutzt werden. Eine zweite Möglichkeit besteht darin, das Fluid über einen Druckverstärker zu führen, in dem Druckverstärker den Druck auf den im Akku herrschenden Hochdruck zu bringen und anschließend das Fluid aus dem Druckverstärker über eine Leitungsverbindung zu dem angeschlossenen Akku auszuschieben. Auch hiermit ist eine Nutzung der Bewegungsenergie verbunden. Generell wird also mit der erfindungsgemäßen Verfahrensweise nicht nur die im System befindliche Menge an Fluid reduziert, sondern es wird auch das Auftreten von Kavitation beziehungsweise überhöhten Druckspitzen vermieden. Das Hydraulikfluid wird aus dem Füllzylinder ohne Lufteinschlüsse und mit niedriger Geschwindigkeit zum zentralen Akku zurückgeführt.The invention has the advantage that the displaced during the slow travel of the piston in the filling cylinder fluid is returned to the battery and thereby for the continuous drive of the filling cylinder or an additional multiplier connected in parallel usable. As a result, in particular the amount of fluid required in the system can be significantly reduced. As far as in the second phase of the process, the piston of the filling cylinder moves up at a fast speed, which at very high speed and lower insertion force from the rod space of the filling cylinder displaced fluid either via the control valve in the Piston space of the filling cylinder fed back and thus be used for the further drive of the filling cylinder. A second possibility is to lead the fluid through a pressure booster to bring in the pressure booster, the pressure on the pressure prevailing in the battery high pressure and then expel the fluid from the pressure booster via a line connection to the connected battery. Again, this is a use of kinetic energy connected. In general, therefore, the process according to the invention not only reduces the amount of fluid in the system, but also avoids the occurrence of cavitation or excessive pressure peaks. The hydraulic fluid is returned from the charging cylinder without trapping air and at low speed to the central battery.

Soweit es bei einem gefüllten Formhohlraum zu einem Abbremsen der Fahrt des Kolbens des Füllzylinders kommt, ist nach einem Ausführungsbeispiel der Erfindung vorgesehen, dass zum Abbremsen des Kolbens des Füllzylinders bei Beendigung von dessen schneller während der zweiten Phase herrschenden Vorschubbewegung der Zufluss von Fluid zum Kolbenraum des Füllzylinders aus dem Akku während des Zeitraumes des Abbremsens des Kolbens gedrosselt und während dieser Drosselung das aus dem Stangenraum des Füllzylinders verdrängte Fluid über das Steuerventil mit zugeordneter Leitungsverbindung zum Akku rückgeführt wird, wodurch ebenfalls ein energetischer Vorteil entsteht und jegliche Kavitation vermieden wird.As far as it comes to a filled mold cavity to slow down the travel of the piston of the filling cylinder is provided according to an embodiment of the invention that for braking the piston of the filling cylinder at the end of its faster prevailing during the second phase feed movement of the inflow of fluid to the piston chamber of the Filling cylinder throttled from the battery during the period of deceleration of the piston and during this throttling the displaced from the rod chamber of the filling cylinder fluid is returned via the control valve with associated line connection to the battery, which also creates an energetic advantage and any cavitation is avoided.

In an sich bekannter Weise ist nach einem Ausführungsbeispiel der Erfindung vorgesehen, dass nach Beendigung des Abbremsvorganges während einer Abkühlphase des flüssigen Metalls im Formhohlraum eine Multiplikation des auf den Kolben des Füllzylinders einwirkenden Drucks durch Beaufschlagung von dessen Kolbenraum durch die einseitige Kolbenstange eines als einen Kolben mit der angeschlossenen Kolbenstange aufweisender Arbeitszylinder ausgebildeten Multiplikators erfolgt, wobei der Kolbenraum des Multiplikators aufgrund einer hydraulischen Parallelschaltung mit dem Füllzylinder jeweils mit dem vom Akku zugeführten Fluid beaufschlagt ist. Hierbei kann vorgesehen sein, dass während der ersten und der zweiten Phase des Vorschubes des Kolbens im Füllzylinder der Druck im Stangenraum des Multiplikators mittels einer Ventilanordnung auf dem Niveau des im Akku anstehenden Drucks eingestellt wird, so dass wegen der Druckausgeglichenheit von Stangenraum und Kolbenraum des Multiplikators keine Bewegung des Kolbens des Multiplikators gegeben ist. Entsprechend kann vorgesehen sein, daß über das zugeordnete Ventil der im Akku anstehende Druck auch im Stangenraum des Multiplikators eingestellt wird, so daß Stangenraum und Kolbenraum des Multiplikators druckausgeglichen sind. Alternativ kann auch vorgesehen sein, daß der Stangenraum des Multiplikators mittels des Ventils abgesperrt ist.In a conventional manner is provided according to an embodiment of the invention, that after completion of the deceleration process during a cooling phase of the liquid metal in the mold cavity, a multiplication of the pressure acting on the piston of the filling cylinder pressure by acting on the piston chamber by the one-sided piston rod as a piston the connected piston rod exhibiting working cylinder trained multiplier, wherein the piston chamber of the multiplier due to a hydraulic parallel connection with the Filling cylinder is acted upon in each case with the supplied fluid from the battery. It can be provided that during the first and the second phase of the advancement of the piston in the filling cylinder, the pressure in the rod space of the multiplier is adjusted by means of a valve assembly at the level of the pending pressure in the battery, so that because of the pressure balance of rod space and piston space of the multiplier no movement of the piston of the multiplier is given. Accordingly, it can be provided that via the associated valve of the pending pressure in the accumulator is also set in the rod space of the multiplier, so that rod space and piston chamber of the multiplier are pressure balanced. Alternatively it can also be provided that the rod space of the multiplier is shut off by means of the valve.

Soweit es während der Abkühlphase beziehungsweise der Multiplikationsphase nur noch zu geringfügigen Nachpressbewegungen des Kolbens des Füllzylinders kommt, ist während dieser Phase vorgesehen, den Stangenraum des Füllzylinders über das Steuerventil mit zugeordneter Leitungsverbindung zum Tank drucklos zu stellen, so dass den Bewegungen des Kolbens während der Abkühlphase kein Widerstand entgegengesetzt ist. Die damit verbundenen, in den Tank abgeleiteten Mengen an Fluid sind jedoch gering.As far as there is only slight Nachpressbewegungen the piston of the filling cylinder during the cooling phase or the multiplication phase is provided during this phase to depressurize the rod space of the filling cylinder via the control valve with associated line connection to the tank, so that the movements of the piston during the cooling phase no resistance is opposite. However, the associated, in the tank derived amounts of fluid are low.

Soweit am Ende der Abkühlphase auch der im Kolbenraum des Füllzylinders multiplizierte Druck abgebaut werden muss, ist erfindungsgemäß vorgesehen, dass nach dem Ende der Abkühlphase die Verbindung zwischen dem Akku einerseits und Füllzylinder sowie Multiplikator andererseits unterbrochen und das im Füllzylinder kolbenseitig unter hohem Druck stehende Fluid mittels einer nachgeschalteten Ventilanordnung zum Akku rückgeführt wird. Auch hiermit ist eine entsprechende Nutzung des entsprechenden Energieniveaus verbunden.As far as the multiplied in the piston chamber of the filling cylinder pressure must be reduced at the end of the cooling phase, the invention provides that after the end of the cooling phase, the connection between the battery on the one hand and filling cylinder and multiplier on the other hand interrupted and in the filling cylinder piston side under high pressure fluid means a downstream valve assembly is returned to the battery. Hereby, a corresponding use of the corresponding energy level is connected.

Eine zur Durchführung des Verfahrens geeignete hydraulische Schaltungsanordnung besteht in an sich bekannter Weise aus einer Pumpe, einem Tank und einem daran mittels Steuerventilen angeschlossenen hydraulischen Steuerkreis zur Versorgung eines als Arbeitszylinder mit einem eine einseitige Kolbenstange aufweisenden Kolben ausgebildeten Füllzylinders, wobei an den Steuerkreis ein unter Zwischenschaltung eines Schaltventils mit dem Kolbenraum des Füllzylinders verbundener Akku angeschlossen ist. Zur Anpassung an das erfindungsgemäße Verfahren ist eine derartige bekannte hydraulische Schaltungsanordnung dadurch gekennzeichnet, dass an den Stangenraum des Füllzylinders ein Steuerventil angeschlossen ist, mittels dessen das bei der Vorschubbewegung des Kolbens in dem Füllzylinder aus dessen Stangenraum verdrängte Fluid wahlweise dem Akku, einem seinerseits an den Akku angeschlossenen Druckübersetzer, dem Kolbenraum des Füllzylinders und dem Tank zuleitbar ist.A suitable for carrying out the method hydraulic circuitry consists in a conventional manner of a pump, a tank and a connected thereto by means of control valves hydraulic control circuit for supplying a working cylinder with a a one-sided piston rod having piston formed filling cylinder, wherein connected to the control circuit connected to the piston chamber of the filling cylinder with the interposition of a switching valve battery. To adapt to the method according to the invention, such a known hydraulic circuit arrangement is characterized in that the rod chamber of the filling cylinder, a control valve is connected by means of which in the advancing movement of the piston in the filling cylinder displaced from the rod space fluid either the battery, in turn to the Battery connected pressure intensifier, the piston chamber of the filling cylinder and the tank is zuleitbar.

Zur Nutzung der Energie des bei der Vorschubbewegung des Kolbens im Füllzylinder aus dem Stangenraum verdrängten Fluids ist nach einem Ausführungsbeispiel vorgesehen, dass ein Anschluss des den Abfluss des aus dem Stangenraum des Füllzylinders verdrängten Fluids steuernden Steuerventils über eine Leitung unmittelbar mit dem Akku verbunden und in die Leitung ein Rückschlagventil mit einer zum Akku gerichteten Durchlassrichtung eingeschaltet ist.In order to utilize the energy of the fluid displaced from the rod space during the advancing movement of the piston in the filling cylinder, according to one exemplary embodiment, a connection of the control valve controlling the outflow of the fluid displaced from the rod space of the filling cylinder is connected directly to the battery via a line and into the reservoir Line a check valve is turned on with a directed towards the battery passage direction.

Soweit das bei der Vorschubbewegung des Kolbens im Füllzylinder aus dem Stangenraum verdrängte Fluid auf den in dieser Phase im Akku herrschenden Druck gebracht werden soll, ist nach einem Ausführungsbeispiel der Erfindung vorgesehen, dass ein Anschluss des den Abfluss des aus dem Stangenraum des Füllzylinders verdrängten Fluids steuernden Steuerventils über eine Leitung mit dem Kolbenraum des als einen Kolben mit einseitiger Kolbenstange aufweisender Arbeitszylinder ausgebildeten Druckübersetzers verbunden und die Stangenseite des Druckübersetzers über eine Leitung mit dem Akku verbunden ist. Hierbei können die Flächenverhältnisse am Kolben mit einseitig angeschlagener Kolbenstange des Druckübersetzers derart ausgelegt sein, dass der in seinem Stangenraum durch Zuleitung des aus dem Füllzylinder verdrängten Fluids in seinem Kolbenraum erzeugte Druck dem bei Aufschaltung der Druckerhöhungseinrichtung auf den Akku erzeugten Druck entspricht. Entsprechend kann vorgesehen sein, dass in die vom Stangenraum des Druckübersetzers zum Akku führende Leitung ein Rückschlagventil mit einer zum Akku gerichteten Durchlassrichtung eingeschaltet ist.Insofar as the displaced during the advancing movement of the piston in the filling cylinder from the rod space fluid is to be brought to the pressure prevailing in the battery in this phase, according to one embodiment of the invention provides that a connection of the outflow of the displaced from the rod chamber of the filling fluid fluid control Control valve connected via a line to the piston chamber of the designed as a piston with one-sided piston rod having working cylinder pressure booster and the rod side of the pressure booster is connected via a line to the battery. In this case, the area ratios on the piston can be designed with piston rod of the pressure booster hinged on one side such that the pressure generated in its rod space by supplying the fluid displaced from the filling cylinder in its piston chamber corresponds to the pressure generated when the pressure booster is connected to the battery. Accordingly, it can be provided that in the of Rod space of the pressure booster to the battery leading line a check valve is turned on with a direction of the battery direction of passage.

Soweit vorgesehen ist, das aus dem Stangenraum des Füllzylinders beim Vorschub des Kolbens verdrängte Fluid durch Rückspeisung für den Antrieb des Füllzylinders zu nutzen, sieht ein Ausführungsbeispiel der Erfindung vor, dass ein Anschluss des den Abfluss des aus dem Stangenraum des Füllzylinders verdrängten Fluids steuernden Steuerventils über eine Leitung mit dem Kolbenraum des Füllzylinders verbunden ist.As far as it is intended to use the displaced from the rod space of the filling cylinder during the advance of the piston fluid by feeding back to drive the filling cylinder, an embodiment of the invention provides that a connection of the outflow of the displaced from the rod chamber of the filling fluid fluid control valve over a line is connected to the piston chamber of the filling cylinder.

Nach einem Ausführungsbeispiel der Erfindung ist vorgesehen, dass ein Anschluss des den Abfluss des aus dem Stangenraum des Füllzylinders verdrängten Fluids steuernden Steuerventils mit dem Tank verbunden ist; hierdurch soll der Stangenraum des Füllzylinders während der Abkühlphase des Metalls im Formhohlraum drucklos gestellt sein.According to one embodiment of the invention it is provided that a connection of the control valve controlling the outflow of the fluid displaced from the rod space of the filling cylinder is connected to the tank; As a result, the rod space of the filling cylinder should be depressurized during the cooling phase of the metal in the mold cavity.

Soweit die hydraulische Schaltungsanordnung in einer an sich bekannten Weise auch einen während der Abkühlphase wirksamen Multiplikator aufweist, ist nach einem Ausführungsbeispiel der Erfindung vorgesehen, dass ein als einen Kolben mit einseitiger Kolbenstange aufweisender Arbeitszylinder ausgebildeter Multiplikator in einer hydraulischen Parallelschaltung zum Füllzylinder angeordnet ist, wobei die Kolbenstange des Multiplikators in den Kolbenraum des Füllzylinders zur Druckverstärkung einfährt, wobei der Kolbenraum des Multiplikators an den Akku angeschlossen und der Stangenraum des Multiplikators unter Zwischenschaltung eines Ventils mittels eines Druckregelventils wahlweise mit dem Akku oder dem Tank verbindbar ist.Insofar as the hydraulic circuit arrangement also has a multiplier active during the cooling phase, according to one exemplary embodiment of the invention, a multiplier designed as a piston with a one-sided piston rod is arranged in a hydraulic parallel connection to the filling cylinder, wherein the Piston rod of the multiplier in the piston chamber of the filling cylinder for pressure amplification retracts, wherein the piston chamber of the multiplier connected to the battery and the rod space of the multiplier with the interposition of a valve by means of a pressure control valve is optionally connectable to the battery or the tank.

Nach Abschluss eines Arbeitszyklus sind der Füllzylinder, der Multiplikator und der Druckübersetzer jeweils in ihre Ausgangsstellung zurückzuführen; hierzu kann vorgesehen sein, dass Stangenraum und Kolbenraum von Füllzylinder, Multiplikator und Druckübersetzer zum Rückhub des jeweils darin angeordneten Kolbens mittels wenigstens eines zugeordneten Steuerventils an Pumpe und/oder Tank anschließbar sind.After completion of a cycle, the filling cylinder, the multiplier and the pressure booster are each returned to their original position; For this purpose, it can be provided that rod space and piston chamber of Filling cylinder, multiplier and pressure booster for the return stroke of each piston arranged therein by means of at least one associated control valve to the pump and / or tank can be connected.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung wiedergegeben, welches nachstehend beschrieben ist. Die einzige Figur zeigt ein schematisiertes hydraulisches Schaltungsschema für die zur Durchführung des Verfahrens vorgesehenen Komponenten.In the drawing, an embodiment of the invention is reproduced, which is described below. The sole FIGURE shows a schematic hydraulic circuit diagram for the components provided for carrying out the method.

Bei Metalldruckgussanlagen kommt eine Druckgussform 10 mit einem darin angeordneten Formhohlraum 11 zum Einsatz, der mit dem heißen flüssigen Metall zu füllen ist. Dem Formhohlraum 11 ist eine Füllbüchse 12 vorgeschaltet. Zum Einbringen des flüssigen Metalls in Füllbüchse 12 bzw. Formhohlraum 11 ist ein Füllzylinder 13 vorgesehen, der als ein Arbeitszylinder bekannter Bauart mit einem Kolben 14 und einseitiger Kolbenstange 15 ausgebildet ist, wobei die Kolbenstange 15 zum Einfahren in die Füllbüchse eingerichtet ist, um das ebenfalls mittels der Kolbenbewegung in die Füllbüchse 12 eingefüllte Metall in den Formhohlraum 11 auszuschieben. Der Kolben 14 unterteilt den Füllzylinder 13 in einen Kolbenraum 16 und in einen Stangenraum 17. Im Hinblick auf eine während der Durchführung des Druckverfahrens erforderliche Multiplikation des im Kolbenraum 16 des Füllzylinders 13 anstehenden Drucks ist dem Füllzylinder 13 ein Multiplikator 18 zugeordnet, der ebenfalls als ein Arbeitszylinder mit Kolben 19 und einseitig wirkender Kolbenstange 20 ausgebildet ist, wobei die Kolbenstange 20 des Multiplikators 18 zum Einfahren in den Kolbenraum 16 des Füllzylinders 13 eingerichtet ist. Der Kolben 19 des Multiplikators 18 unterteilt den Zylinderinnenraum in einen Kolbenraum 21 und einen Stangenraum 22.In metal die casting equipment, a die 10 having a mold cavity 11 disposed therein is used to be filled with the hot liquid metal. The mold cavity 11 is a Füllbüchse 12 upstream. For introducing the liquid metal in Füllbüchse 12 or mold cavity 11, a filling cylinder 13 is provided, which is designed as a working cylinder of known design with a piston 14 and one-sided piston rod 15, wherein the piston rod 15 is arranged for retraction into the Füllbüchse to the same by means of the piston movement in the Füllbüchse 12 filled metal in the mold cavity 11 auszuschieben. The piston 14 divides the filling cylinder 13 into a piston chamber 16 and into a rod space 17. With regard to a required during the implementation of the printing process multiplication of the pressure in the piston chamber 16 of the filling cylinder 13 is the filling cylinder 13, a multiplier 18 associated with, also as a Working cylinder with piston 19 and unilaterally acting piston rod 20 is formed, wherein the piston rod 20 of the multiplier 18 is arranged for retraction into the piston chamber 16 of the filling cylinder 13. The piston 19 of the multiplier 18 divides the cylinder interior into a piston chamber 21 and a rod space 22.

Zur Versorgung von Füllzylinder 13 und Multiplikator 18 ist ein Akku 23 vorgesehen, der von einer Pumpe 24 über eine Leitung 25 jeweils mit Fluid füllbar ist, wobei in die Leitung 25 ein Rückschlagventil 26 mit einer zum Akku gerichteten Durchlassrichtung eingeschaltet ist, um das Füllen des Akkus 23 durch die Pumpe 24 zu ermöglichen, in der Gegenrichtung aber einen Rückfluss des Fluids vom Akku 23 in Richtung der Pumpe 24 zu verhindern.To supply filling cylinder 13 and multiplier 18, a battery 23 is provided, which is filled by a pump 24 via a line 25 each with fluid, wherein in the line 25, a check valve 26 with a to Battery directed forward direction is turned on to allow the filling of the battery 23 by the pump 24, but in the opposite direction to prevent backflow of the fluid from the battery 23 in the direction of the pump 24.

Soweit der Akku 23 zur Versorgung von Füllzylinder 13 und Multiplikator 18 eingerichtet ist, geht vom Akku 23 eine Leitung 27 aus, in die ein Ventil 28 eingeschaltet ist. Zwischen dem Ventil 28 und Füllzylinder 13 beziehungsweise Multiplikator 18 verzweigt sich die Leitung 27 in eine zum Füllzylinder 13 führende Leitung 27a und eine zum Multiplikator 18 führende Leitung 27b, wobei beide Leitungen 27a und 27b jeweils an den Kolbenraum 16 beziehungsweise 21 von Füllzylinder 13 und Multiplikator 18 angeschlossen sind, sodass der Abfluss von Fluid aus dem Akku 23 für ein Ausschieben der jeweiligen Kolben 14 beziehungsweise 19 mit angeschlossener Kolbenstange 15 beziehungsweise 21 sorgt. In die Leitung 27a ist noch ein Rückschlagventil 29 mit einer zum Füllzylinder 13 gerichteten Durchlassrichtung eingeschaltet, dessen Funktion später erläutert wird.As far as the battery 23 is arranged to supply filling cylinder 13 and multiplier 18, goes from the battery 23, a line 27, in which a valve 28 is turned on. Between the valve 28 and filling cylinder 13 and multiplier 18, the line 27 branches into a leading to the filling cylinder 13 line 27a and a multiplier 18 leading line 27b, both lines 27a and 27b respectively to the piston chamber 16 and 21 of the filling cylinder 13 and multiplier 18 are connected so that the outflow of fluid from the battery 23 for pushing out of the respective pistons 14 and 19 with connected piston rod 15 and 21 provides. In the line 27a is still a check valve 29 is turned on with a directed to the filling cylinder 13 passage direction, whose function will be explained later.

Soweit beim Vorschub des Kolbens 14 in den Füllzylinder 13 das dabei aus dessen Stangenraum verdrängte Fluid abzuleiten ist, führt eine Leitung 31 vom Stangenraum 17 des Füllzylinders 13 zu einem Steuerventil 30 mit einer Mehrzahl von Anschlüssen 32, 34, 41 und 44.Insofar as during the advancement of the piston 14 into the filling cylinder 13 the fluid displaced thereby from the rod space is to be diverted, a line 31 leads from the rod space 17 of the filling cylinder 13 to a control valve 30 with a plurality of connections 32, 34, 41 and 44.

Ein erster Anschluss 32 verbindet das Steuerventil 30 mit einem Tank 50, sodass bei entsprechender Stellung des Steuerventils 30 der Stangenraum 17 des Füllzylinders 13 zum Tank 50 entlastet werden kann.A first port 32 connects the control valve 30 to a tank 50, so that with a corresponding position of the control valve 30, the rod space 17 of the filling cylinder 13 to the tank 50 can be relieved.

Ein zweiter Anschluss 34 des Steuerventils 30 ist mittels einer Leitung 60 mit einem Druckübersetzer 61 verbunden. Dieser Druckübersetzer 61 ist als mit einem Kolben 35 mit einseitig angeschlagener Kolbenstange 36 ausgebildeter Arbeitszylinder ausgebildet, wobei der Kolben 35 das Innere des Druckübersetzers 61 in einen Kolbenraum 37 und einen Stangenraum 38 unterteilt. Von dem Stangenraum 38 führt eine Leitung 39 zum Akku 23, in die ein Rückschlagventil 40 mit einer zum Akku 23 hin gerichteten Durchlassrichtung eingeschaltet ist.A second connection 34 of the control valve 30 is connected by means of a line 60 to a pressure booster 61. This pressure intensifier 61 is designed as a piston 35 with one-sided hinged piston rod 36 trained working cylinder, wherein the piston 35, the interior of the Pressure translator 61 into a piston chamber 37 and a rod space 38 divided. Of the rod space 38, a line 39 leads to the battery 23, in which a check valve 40 is turned on with a directed toward the battery 23 toward the direction of passage.

Ein weiterer Anschluss 41 des Steuerventils 30 ist über eine Leitung 42 mit dem Akku 23 verbunden, wobei auch in diese Leitung 42 ein Rückschlagventil 43 mit einer zum Akku 23 gerichteten Durchlassöffnung eingeschaltet ist.Another connection 41 of the control valve 30 is connected via a line 42 to the battery 23, wherein in this line 42, a check valve 43 is turned on with a battery 23 directed to the passage opening.

Ein vierter Anschluss 44 des Steuerventils 30 ist über eine Leitung 45 unmittelbar mit dem Kolbenraum 16 des Füllzylinders 13 verbunden.A fourth connection 44 of the control valve 30 is connected via a line 45 directly to the piston chamber 16 of the filling cylinder 13.

Soweit auch in dem als Arbeitszylinder ausgebildeten Multiplikator 18 bei der Ausschubbewegung von dessen Kolbenstange 20 das in dessen Stangenraum 22 anstehende Fluid ausgeschoben wird, ist an den Kolbenraum 21 des Multiplikators 18 eine Leitung 46 angeschlossen, die zu einem Ventil 47 und einem diesem nachgeschalteten Druckregelventil 48 führt. Von dem Druckregelventil 48 führt eine Leitung 49 zum Akku 23. Das Druckregelventil 48 weist einen Anschluss zum Tank 50 auf, so dass das aus dem Stangenraum 22 des Multiplikators 18 verdrängte Fluid zum Tank 50 abgeleitet werden kann.As far as in the trained as a working cylinder multiplier 18 in the ejection movement of the piston rod 20 which is pushed out in the rod space 22 fluid is connected to the piston chamber 21 of the multiplier 18, a line 46 to a valve 47 and a downstream pressure control valve 48th leads. From the pressure control valve 48, a line 49 leads to the battery 23. The pressure control valve 48 has a connection to the tank 50, so that the fluid displaced from the rod space 22 of the multiplier 18 can be diverted to the tank 50.

Nach Beendigung des Arbeitszyklus muss zunächst der Kolbenraum 16 des Füllzylinders 13 mit dem darin unter einem hohen, von dem Multiplikator 18 multiplizierten Druck anstehenden Fluid entlastet werden, und hierzu ist der Kolbenraum 16 über eine Leitungsverbindung 52 und 70 mit einem darin eingeschalteten Ventil 28a mit dem Akku 23 verbindbar, so daß das unter Druck stehende Fluid in den Akku 23 rückgeführt werden kann.After completion of the duty cycle, the piston chamber 16 of the filling cylinder 13 must first be relieved with the therein under a high, multiplied by the multiplier 18 multiplied pressure pending fluid, and this is the piston chamber 16 via a line connection 52 and 70 with a valve 28 a therein with the Battery 23 connectable, so that the pressurized fluid can be recycled into the battery 23.

Soweit nach Beendigung eines Arbeitszyklus die jeweiligen Arbeitszylinder in Form des Füllzylinders 13, des Multiplikators 18 und des Druckübersetzers 61 in ihre Ausgangsstellung zurückzuführen sind, ist der Pumpe 24 ein Steuerventil 51 nachgeschaltet, welches über einen Anschluss mit dem Tank 50 zu verbinden ist. Die von dem Steuerventil 51 abgehenden Leitungen führen mit der Leitung 52 zum Kolbenraum 16 des Füllzylinders 13 und mit der Leitung 53 zum Stangenraum 17 des Füllzylinders 13. Bei entsprechender Schaltung des Steuerventils 51 kann somit bei Beaufschlagung des Stangenraums 17 durch von der Pumpe 24 gefördertes Fluid der Kolben 14 in seine Ausgangsstellung zurück gefahren werden, wobei das aus dem Kolbenraum 16 verdrängte Fluid über die Leitung 52 und das Steuerventil 51 zum Tank 50 abfließt.As far as after completion of a working cycle, the respective working cylinder in the form of the filling cylinder 13, the multiplier 18 and the pressure booster 61 are due to their initial position, the pump 24 is a Control valve 51 connected downstream, which is to be connected via a connection to the tank 50. The outgoing of the control valve 51 lines lead with the line 52 to the piston chamber 16 of the filling cylinder 13 and the line 53 to the rod space 17 of the filling cylinder 13. With appropriate circuit of the control valve 51 can thus by acting on the rod chamber 17 by pump 24 funded fluid the piston 14 are moved back to its initial position, wherein the displaced from the piston chamber 16 fluid via the line 52 and the control valve 51 flows to the tank 50.

In gleicher Weise ist dem Druckübersetzer 61 ein entsprechendes Steuerventil 51 mit Anschluss an die Pumpe 24 und den Tank 50 vorgesehen, wobei das Steuerventil 51 mittels entsprechender Leitungen 54 und 55 mit dem Kolbenraum 37 beziehungsweise dem Stangenraum 38 des Druckübersetzers 61 verbunden sind. Auf diese Weise ist auch hier ein Zurücksetzen des Druckübersetzers 61 gegeben.Similarly, the pressure intensifier 61, a corresponding control valve 51 is provided with connection to the pump 24 and the tank 50, wherein the control valve 51 are connected by means of respective lines 54 and 55 with the piston chamber 37 and the rod chamber 38 of the pressure booster 61. In this way, a reset of the pressure booster 61 is also given here.

Nachstehend wird nun die Durchführung des Verfahrens anhand der vorstehend erläuterten Schaltungsanordnung beschrieben:

  • Vor Beginn eines Arbeitszyklus wird der Akku 23 von der Pumpe 24 über die Leitung 25 gefüllt und aufgeladen, wobei ein Rückströmen durch das Rückschlagventil 26 verhindert ist. In dieser Stellung befindet sich das Steuerventil 51 in seiner Sperrstellung ebenso wie das Ventil 28, welches die Verbindung zwischen dem Akku 23 und Füllzylinder 13 sowie Multiplikator 18 absperrt.
The implementation of the method will now be described with reference to the circuit arrangement explained above:
  • Before the start of a working cycle, the battery 23 is filled and charged by the pump 24 via the line 25, wherein a return flow through the check valve 26 is prevented. In this position, the control valve 51 is in its blocking position as well as the valve 28, which shuts off the connection between the battery 23 and the filling cylinder 13 and multiplier 18.

Zu Beginn des Verfahrens wird das Ventil 28 in seine Öffnungsstellung verbracht, so dass aus dem Akku 23 Fluid über die Leitung 27 beziehungsweise 27a und 27b in den jeweiligen Kolbenraum 16 beziehungsweise 21 von Füllzylinder 13 und Multiplikator 18 strömen kann. Aufgrund der Regelung des Fluidstromes in dem Ventil 28 kann die Geschwindigkeit des Verfahrens des Kolbens 14 in dem Füllzylinder 13 zum Füllen der Füllbüchse 12 geregelt werden. Soweit der Kolbenraum 21 des Multiplikators 18 ebenfalls mit Fluid beaufschlagt ist, wird zu diesem Zeitpunkt über die Ventilanordnung 47, 48 der im Stangenraum 22 des Multiplikators 18 anstehende Druck auf dem Niveau des im Akku 23 anstehenden Drucks gehalten, so daß bei einer Druckausgeglichenheit von Stangenraum 22 und Kolbenraum 21 keine Bewegung des Kolbens 19 im Multiplikator 18 stattfindet. In dieser Phase befindet sich das Steuerventil 30 in einer Stellung, in welcher der Anschluss 41 in Verbindung mit der aus dem Stangenraum 17 des Füllzylinders 13 wegführenden Leitung 31 steht, so dass das bei der Vorwärtsfahrt des Kolbens 14 verdrängte Fluid über das Steuerventil 30 und dessen Anschluss 41 und die weitere Leitung 42 zum Akku 23 zurückgeführt wird, wobei das Rückschlagventil 43 diese Rückströmung zulässt.At the beginning of the process, the valve 28 is moved to its open position so that fluid 23 can flow from the accumulator 23 via the line 27 or 27a and 27b into the respective piston chamber 16 or 21 of the filling cylinder 13 and multiplier 18. Due to the regulation of the fluid flow in the valve 28, the Speed of the process of the piston 14 in the filling cylinder 13 for filling the Füllsüchse 12 are regulated. As far as the piston chamber 21 of the multiplier 18 is also acted upon with fluid, at this time via the valve assembly 47, 48 of the rod space 22 of the multiplier 18 pending pressure is maintained at the level of waiting in the battery 23 pressure, so that at a pressure balance of rod space 22 and piston chamber 21 no movement of the piston 19 in the multiplier 18 takes place. In this phase, the control valve 30 is in a position in which the port 41 is in communication with the leading out of the rod chamber 17 of the filling cylinder 13 line 31, so that the displaced during the forward movement of the piston 14 fluid via the control valve 30 and the Terminal 41 and the further line 42 is returned to the battery 23, wherein the check valve 43 allows this backflow.

Ist die Füllbüchse 12 gefüllt und soll das darin enthaltene Metall nun in den Formhohlraum 11 der Druckgussform 10 verbracht werden, so erfolgt ein weiteres Vorfahren des Kolbens 14 im Füllzylinder 13 mit hoher Geschwindigkeit, beispielsweise mit 3 bis 9 Meter pro Sekunde. Während dieser schnellen Vorwärtsfahrt des Kolbens 14 wird das Steuerventil 30 in eine Stellung gebracht, in welcher dessen Anschluss 34 in Verbindung mit der Leitung 31 gebracht ist. Das somit aus dem Stangenraum 17 des Füllzylinders 13 verdrängte Fluid wird über die Leitung 60 einem Druckübersetzer 61 zugeführt, welcher ebenfalls als Arbeitszylinder mit einem eine einseitige Kolbenstange 36 aufweisenden Kolben 35 ausgebildet ist. Die Zuleitung 60 ist an den Kolbenraum 37 des Druckübersetzers 61 angeschlossen. Aufgrund der Flächenverhältnisse am Kolben 35 mit Kolbenstange 36 findet im Stangenraum 38 eine Erhöhung des Drucks für das aus dem Druckübersetzer 61 ausgeschobene Fluid statt, welches über das in dieser Richtung durchlässige Rückschlagventil 40 und die Leitung 39 zum Akku 23 geleitet wird, wobei der durch die Druckerhöhung erzeugte Druck dem im Akku 23 gegebenen Druck entspricht.If the stuffing box 12 is filled and if the metal contained therein is now to be brought into the mold cavity 11 of the pressure casting mold 10, then another ancestor of the piston 14 in the filling cylinder 13 takes place at high speed, for example at 3 to 9 meters per second. During this rapid forward travel of the piston 14, the control valve 30 is brought into a position in which its connection 34 is brought into connection with the line 31. The thus displaced from the rod space 17 of the filling cylinder 13 fluid is supplied via line 60 to a pressure booster 61, which is also designed as a working cylinder with a one-sided piston rod 36 having piston 35. The supply line 60 is connected to the piston chamber 37 of the pressure booster 61. Due to the surface conditions on the piston 35 with the piston rod 36 takes place in the rod chamber 38, an increase in the pressure for the ejected from the pressure booster fluid 61, which is passed over the permeable in this direction check valve 40 and the line 39 to the battery 23, wherein the through the Pressure increase generated pressure corresponds to the pressure given in the battery 23.

Wird der Füllzylinder 13 in dieser Phase mit sehr hoher Geschwindigkeit und verminderter Einpresskraft gefahren, kann das Ventil 30 auch in eine Stellung gebracht werden, in der dessen Anschluss 44 mit dem Stangenraum 17 des Füllzylinders 13 verbunden ist, so dass das aus dem Stangenraum 17 verdrängte Fluid über den Anschluss 44 und die daran anschließende Leitung 45 zum Kolbenraum 16 des Füllzylinders 13 geleitet werden und hier die Antriebsbewegung für den Kolben 14 unterstützen kann.If the filling cylinder 13 is driven in this phase at very high speed and reduced press-in force, the valve 30 can also be brought into a position in which its terminal 44 is connected to the rod space 17 of the filling cylinder 13, so that displaced from the rod space 17 Fluid via the port 44 and the subsequent line 45 to the piston chamber 16 of the filling cylinder 13 are passed and here can support the drive movement for the piston 14.

Soweit am Ende des Füllvorganges für den Formhohlraum 11 ein Abbremsen des Kolbens 14 des Füllzylinders 13 erfolgt, wird während dieses kurzen Zeitraumes das Ventil 28 in der Leitung 27 in eine niedrige Öffnungsstellung gebracht, so daß der Kolbenraum 16 des Füllzylinders 13 nur noch mit einer geringen Menge Fluid beaufschlagt ist. Gleichzeitig wird das Steuerventil 30 erneut in eine Stellung verbracht, in der sein Anschluss 41 eine Verbindung zwischen dem Stangenraum 17 des Füllzylinders 13 und der zum Akku 23 führenden Leitung 42 herstellt, so dass das aus dem Stangenraum 17 des Füllzylinders 13 ausgeschobene Fluid in den Akku 23 rückgespeist wird. Der sich in dieser kurzen Phase aufbauende hohe Systemdruck im Stangenraum 17 des Füllzylinders 13 sorgt dafür, dass die Kolbenbewegung verzögerungsfrei in wenigen Millisekunden auf den gewünschten Wert reduziert wird, wobei die überschüssige Energie in Form von Fluid druckspitzenfrei in den Akku 23 rückgespeist wird.As far as at the end of the filling process for the mold cavity 11 is a deceleration of the piston 14 of the filling cylinder 13, the valve 28 is placed in the line 27 in a low open position during this short period of time, so that the piston chamber 16 of the filling cylinder 13 only with a small Quantity fluid is applied. At the same time, the control valve 30 is again brought into a position in which its connection 41 establishes a connection between the rod space 17 of the filling cylinder 13 and the line leading to the battery 23, so that the fluid ejected from the rod space 17 of the filling cylinder 13 enters the accumulator 23 is fed back. The build-up in this short phase high system pressure in the rod space 17 of the filling cylinder 13 ensures that the piston movement is reduced delay in a few milliseconds to the desired value, the excess energy in the form of fluid pressure is fed back into the accumulator 23.

Soweit am Ende der Bremsphase der Füllzylinder 13 mit einem entsprechend hohen Druck zu beaufschlagen und in einer Haltestellung zu halten ist, wird über eine weitere Öffnung des Ventils 28 Fluid in den Kolbenraum 21 des Multiplikators 18 eingeleitet, so dass aufgrund der Querschnittsverhältnisse von Kolbenseite und Stangenseite auch hier ein entsprechend höherer Druck zur Einwirkung auf den Füllzylinder 13 gebracht wird. Soweit bis zu diesem Verfahrensschritt der im Stangenraum 22 des Multiplikators 18 anstehende Druck auf dem im Akku 23 herrschenden Druck eingestellt war, erfolgt nun im Ventil 47 eine Reduzierung des Drucks auf einen niedrigeren Wert, wobei die Höhe der Vorspannung im Ergebnis den vom Multiplikator 18 im Kolbenraum 16 des Füllzylinders 13 multiplizierten Druck bestimmt bzw. festlegt. Während der Multiplikation verfährt der Kolben 19 des Multiplikators 18 in Richtung auf den Füllzylinder 13 zu, so daß entsprechend Fluid aus dem Stangenraum 22 des Multiplikators 18 verdrängt wird. Dieses Fluid wird über die Ventile 47 und 48 zum Tank 50 abgeleitet. Insofern kommt dem Ventil 47 während der Verfahrensführung eine Doppelfunktion zu.As far as at the end of the braking phase, the filling cylinder 13 is to be acted upon by a correspondingly high pressure and held in a holding position, 28 fluid is introduced into the piston chamber 21 of the multiplier 18 via a further opening of the valve, so that due to the cross-sectional conditions of the piston side and rod side Here, too, a correspondingly higher pressure for acting on the filling cylinder 13 is brought. As far as up to this process step, the pressure in the rod space 22 of the multiplier 18 was set to the pressure prevailing in the battery 23, now takes place in the valve 47, a reduction of the pressure to a lower value, wherein the height of the bias voltage as a result of multiplied by the multiplier 18 in the piston chamber 16 of the filling cylinder 13 determines or sets pressure. During multiplication, the piston 19 of the multiplier 18 moves in the direction of the filling cylinder 13, so that corresponding fluid is displaced from the rod space 22 of the multiplier 18. This fluid is discharged via the valves 47 and 48 to the tank 50. In this respect, the valve 47 has a dual function during the process.

Soweit am Ende des Arbeitszyklus eine Entspannung des im Kolbenraum 16 des Füllzylinders 13 anstehenden hohen Drucks erfolgen muss, wird das Fluid über die Leitung 52 und die zur Leitung 25 eingeschaltete Verbindungsleitung 70 mit einem darin angeordneten Ventil 28a in die zum Akku 23 führende Leitung 25 eingespeist, so daß die überschüssige Energie in Form von Fluid ebenfalls durch Rückspeisung in den Akku 23 nutzbar ist.As far as at the end of the working cycle, a relaxation of the pressure in the piston chamber 16 of the filling cylinder 13 high pressure must occur, the fluid is fed via the line 52 and the line 25 switched connection line 70 with a valve disposed therein 28a in the leading to the battery line 23 25th , so that the excess energy in the form of fluid can also be used by feeding back into the battery 23.

Soweit am Ende eines Arbeitszyklus jeweils eine Rückstellung der beteiligten Zylinder zu erfolgen hat, erfolgt dies über eine entsprechende Schaltung der Steuerventile 51. So wird das über die Leitungen 52 und 53 mit Kolbenraum 16 und Stangenraum 17 des Füllzylinders 13 verbundene Steuerventil 51 in eine Stellung verbracht, in welcher durch Einspeisung von Fluid in den Stangenraum 17 der Kolben 14 rückverfahren wird, wobei das aus dem Kolbenraum 16 verdrängte Fluid über die Leitung 52 und das Ventil 51 zum Tank abgeleitet wird. Entsprechendes gilt für die Rückstellung des Druckübersetzers 61 mittels des diesem zugeordneten Steuerventils 51 und der zugeordneten Leitungen 54 beziehungsweise 55.As far as at the end of each working cycle, a provision of the participating cylinder has to be made, this is done via a corresponding circuit of the control valves 51. Thus, the connected via lines 52 and 53 with piston chamber 16 and rod space 17 of the filling cylinder 13 control valve 51 is moved to a position in that by feeding fluid into the rod space 17, the piston 14 is reversed, wherein the displaced from the piston chamber 16 fluid is discharged via the line 52 and the valve 51 to the tank. The same applies to the provision of the pressure intensifier 61 by means of the associated control valve 51 and the associated lines 54 and 55, respectively.

Während dieser Rückfahrbewegung des Kolbens 14 im Füllzylinder 13 beaufschlagt das im Kolbenraum 16 anstehende Fluid auch die Kolbenstange 20 des Multiplikators 18 und sorgt dadurch ebenfalls für ein Zurückfahren des Kolbens 19, wobei das aus dem Kolbenraum 21 verdrängte Fluid über die Leitungen 27b, 27a sowie 52 zum Steuerventil 51 und damit zum daran angeschlossenen Tank 50 rückgeführt wird. Hierbei lässt das Rückschlagventil 29 eine Rückführung des aus dem Kolbenraum 21 des Multiplikators 18 verdrängten Fluids zum Steuerventil 51 zu, während es einen Fluidfluss in der Gegenrichtung sperrt.During this return movement of the piston 14 in the filling cylinder 13, the fluid present in the piston chamber 16 also acts on the piston rod 20 of the multiplier 18 and thereby likewise ensures a retraction of the piston 19, wherein the fluid displaced from the piston chamber 21 over the Lines 27b, 27a and 52 to the control valve 51 and thus to the connected tank 50 is returned. In this case, the check valve 29 allows a return of the displaced from the piston chamber 21 of the multiplier 18 fluid to the control valve 51, while blocking fluid flow in the opposite direction.

Die in den vorstehenden Beschreibung, den Patentansprüchen, der Zusammenfassung und der Zeichnung offenbarten Merkmale des Gegenstandes dieser Unterlagen können einzeln als auch in beliebigen Kombinationen untereinander für die Verwirklichung der Erfindung in ihren verschiedenen Ausführungsformen wesentlich sein.The features disclosed in the foregoing description, the claims, the abstract and the drawing of the subject matter of these documents may be essential individually as well as in any combination with each other for the realization of the invention in its various embodiments.

Claims (14)

  1. A method for operating a metal die casting plant, wherein in a first phase the filling of a shot sleeve (12) connected upstream of the mould cavity (11) of the die casting plant by means of a filling cylinder (13) designed as working cylinder having a piston (14) comprising a one-sided piston rod (15) takes place with slow feed movement of its piston (14), wherein the piston rod (15) of the filling cylinder (13) pushes the liquid metal into the shot sleeve (11) and in a second phase, the liquid metal through a further movement of the piston rod (15) of the filling cylinder (13) into the shot sleeve (11) is brought out of the shot sleeve (11) into the mould cavity (11) by means of a rapid feed movement of the piston (14), wherein the rapid feed movement for supplying the filling cylinder (13) with a fluid suitable for hydraulic purposes is generated by means of the fluid stored in an accumulator (23) connected into an hydraulic control circuit, characterized in that the fluid displaced in the first phase during the slow feed movement of the piston (14) in the filling cylinder (13) out of its rod space (17) is fed back into the accumulator (23) via a control valve (30) switched in a first position (41) with assigned line connection subject to maintaining the pressure prevailing in the rod space (17), and during the second phase for bringing the liquid metal out of the shot sleeve (12) into the mould cavity (11), the fluid displaced out of the rod space (17) of the filling cylinder (13) through the rapid feed movement of the piston (14) is optionally conducted to a pressure intensifier (61) via the control valve (13) switched into a second position (34) with assigned line connection, brought to the high pressure prevailing in the accumulator (23) in the pressure intensifier (61) and following this conducted into the accumulator (23) being under high pressure by the pressure intensifier (61) via a line connection, or is fed back into the piston space (16) of the filling cylinder (13) via the control valve (30) with associated line connection switched into a third position (44), and wherein during a cooling-down phase in a fourth position (32) of the control valve (30), the rod space (17) of the filling cylinder (13) is set pressureless via a line (33) to that tank (50).
  2. The method according to Claim 1, characterized in that during the period of the braking-down of the piston (14) of the filling cylinder (13) upon ending of its rapid feed movement prevailing during the second phase, the inflow of fluid to the piston space (16) of the filling cylinder (13) out of the accumulator (23) is throttled and during his throttling the fluid displaced out of the rod space (17) of the filling cylinder (13) is returned to the accumulator (23) via the control valve (30) with assigned line connection.
  3. The method according to Claim 1 or 2, characterized in that after the ending of the braking process during a cooling-down phase of the liquid metal in the mould cavity (11) a multiplication of the pressure acting on the piston (14) of the filling cylinder (13) by loading its piston space (16) takes place through the one-sided piston rod (20) of a multiplier (18) designed as a working cylinder comprising a piston (19) with connected piston rod (20), wherein the piston space (21) of the multiplier (18), because of a hydraulic parallel connection to the filling cylinder (13) is loaded in each case with the fluid fed in from the accumulator (23).
  4. The method according to Claim 3, characterized in that during the first and second phase of the feed of the piston (14) in the filling cylinder (13), the pressure present in the rod space (22) of the multiplier (18) is adjusted by means of a valve arrangement (47, 48) to the level of the pressure present in the accumulator (23), so that because of the pressure equilibrium of rod space (22) and piston space (21) of the multiplier (18), there is no movement of the piston (19) of the multiplier (18).
  5. The method according to Claim 3 or 4, characterized in that during the cooling-down phase and the multiplication of the pressure acting on the piston (14) of the filling cylinder (13), the rod space (17) of the filling cylinder (13) is set pressureless via the control valve (30) with assigned line connection to the tank (50).
  6. The method according to any one of the Claims 3 to 5, characterized in that after the end of the cooling-down phase the connection between the accumulator (23) on the one hand and filling cylinder (13) as well as multiplier (18) on the other hand is interrupted and the fluid that is present under high pressure in the piston space (16) of the filling cylinder (13) is returned to the accumulator (23) by means of a valve arrangement (28a) connected downstream.
  7. An hydraulic switching arrangement for carrying out a method according to any one of the Claims 1 to 6, with a pump (24), a tank (50) and a hydraulic control circuit connected thereto by means of control valves (51) for supplying a filling cylinder (13) designed as working cylinder comprising a piston (14) with a one-sided piston rod (15), wherein an accumulator (23) connected to the piston space (16) of the filing cylinder (13) subject to the intermediate connection of a valve (28) is connected to the control circuit, characterized in that a control valve (30) is connected to the rod space (17) of the filling cylinder (13), by means of which the fluid displaced during the feed movement of the piston (14) in the filling cylinder (13) out of its rod space (17) can be optionally conducted to the accumulator (23), a pressure intensifier (61) in turn connected to the accumulator (23), to the piston space (16) of the filling cylinder (13) and to the tank (50).
  8. The hydraulic switching arrangement according to Claim 7, characterized in that a connection (41) of the control valve (30) controlling the outflow of the fluid displaced out of the rod space (17) of the filling cylinder (13) is directly connected to the accumulator (23) via a line (42) and a non-return valve (43) with a passage direction directed to the accumulator (23) is connected into the line (42).
  9. The hydraulic switching arrangement according to Claim 7 or 8, characterized in that a connection (34) of the control valve (30) controlling the outflow of the fluid displaced from the rod space (17) of the filling cylinder (13) is connected via a line (60) to the piston space (37) of the pressure intensifier (61) designed as a working cylinder comprising a piston (35) with one-sided piston rod (36) and the rod side (38) of the pressure intensifier (61) is connected to the accumulator (23) via a line (39).
  10. The hydraulic switching arrangement according to Claim 9, characterized in that a non-return valve (40) with a passage direction directed to the accumulator (23) is connected into the line (39) leading from the rod space (38) of the pressure intensifier (61) to the accumulator (23).
  11. The hydraulic switching arrangement according to any one of the Claims 7 to 10, characterized in that a connection (44) of the control valve (30) controlling the outflow of the fluid displaced from the rod space (17) of the filling cylinder (13) is connected to the piston space (16) of the filling cylinder (30) via a line 45.
  12. The hydraulic switching arrangement according to any one of the Claims 7 to 11, characterized in that a connection (32) of the control valve (30) controlling the outflow of the fluid displaced from the rod space (17) of the filling cylinder (13) is connected to the tank (50).
  13. The hydraulic switching arrangement according to any one of the Claims 7 to 12, characterized in that a multiplier (18) designed as working cylinder comprising a piston (19) with one-sided piston rod (20) is arranged in a hydraulic parallel circuit to the filling cylinder (13), wherein the piston rod (20) of the multiplier (18) moves into the piston space (17) of the filling cylinder (13) for pressure amplification, wherein the piston space (21) of the multiplier (18) is connected to the accumulator (23) and the rod space(22) of the multiplier (18) can be optionally connected subject to the intermediate connection of a valve (47) by means of a pressure control valve (48).
  14. The hydraulic switching arrangement according to any one of the Claims 7 to 13, characterized in that rod space and piston space of filling cylinder (13), multiplier (18) and pressure intensifier (61) for the return stroke of the respective piston arranged therein can be connected to pump (24) and/or tank by means of at least one assigned control valves (51).
EP10009266A 2009-09-15 2010-09-07 Method and hydraulic switching assembly for operating a metal pressure casting assembly Active EP2295171B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI201030132T SI2295171T1 (en) 2009-09-15 2010-09-07 Method and hydraulic switching assembly for operating a metal pressure casting assembly
PL10009266T PL2295171T3 (en) 2009-09-15 2010-09-07 Method and hydraulic switching assembly for operating a metal pressure casting assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009041302 2009-09-15

Publications (2)

Publication Number Publication Date
EP2295171A1 EP2295171A1 (en) 2011-03-16
EP2295171B1 true EP2295171B1 (en) 2012-10-24

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Family Applications (1)

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EP10009266A Active EP2295171B1 (en) 2009-09-15 2010-09-07 Method and hydraulic switching assembly for operating a metal pressure casting assembly

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EP (1) EP2295171B1 (en)
ES (1) ES2398532T3 (en)
HR (1) HRP20130060T1 (en)
PL (1) PL2295171T3 (en)
SI (1) SI2295171T1 (en)

Cited By (3)

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Publication number Priority date Publication date Assignee Title
DE102017220836A1 (en) 2016-11-24 2018-05-24 Robert Bosch Gmbh Hydraulic control for a casting unit of an injection molding machine and method for controlling a casting unit of an injection molding machine
DE102018108620A1 (en) 2018-04-11 2018-12-27 Parker Hannifin EMEA S.à.r.l Hydraulic circuit arrangement for a cold or hot chamber die casting machine for the production of metal components
EP3421155A1 (en) 2017-06-28 2019-01-02 Parker Hannifin Manufacturing Germany GmbH & Co. KG Hydraulic circuit device for a cold chamber casting machine

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JP5760769B2 (en) * 2011-07-06 2015-08-12 株式会社豊田自動織機 Injection device
DE102011108253A1 (en) * 2011-07-22 2013-01-24 Rheinisch-Westfälische Technische Hochschule Aachen Method for recovering energy from hydraulic system using hydraulic load, involves switching working chambers in optional manner, particularly by switchable proportional valve to carry out loading and unloading operations in pressure source
JP5673482B2 (en) 2011-10-19 2015-02-18 株式会社豊田自動織機 Injection device
DE102015005920A1 (en) 2015-05-07 2016-11-10 Liebherr-Mining Equipment Colmar Sas Device for energy-optimized hydraulic control of at least one double-acting working cylinder
IT201600125927A1 (en) * 2016-12-13 2018-06-13 Idra S R L INJECTION GROUP FOR DIE-CASTING PLANTS
DE102017129098A1 (en) * 2017-12-07 2019-06-13 Parker Hannifin EMEA S.à.r.l Hydraulic circuit arrangement for a cold or hot chamber pressure casting machine
CN108188371B (en) * 2018-01-18 2024-04-19 宁波海天金属成型设备有限公司 Differential oil circuit system for real-time control of injection in die casting machine
CN111922315B (en) * 2020-08-28 2022-02-01 湛江德利车辆部件有限公司 Method for checking reason of die flying
CN113333715B (en) * 2021-05-28 2022-11-04 重庆长安汽车股份有限公司 Low-pressure casting mold-filling pressure curve design method based on back pressure
AT525638B1 (en) * 2022-02-15 2023-06-15 Engel Austria Gmbh Hydraulic drive unit for a forming machine

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017220836A1 (en) 2016-11-24 2018-05-24 Robert Bosch Gmbh Hydraulic control for a casting unit of an injection molding machine and method for controlling a casting unit of an injection molding machine
WO2018095972A1 (en) 2016-11-24 2018-05-31 Robert Bosch Gmbh Hydraulic control for a molding unit of an injection molding machine, and method for controlling a molding unit of an injection molding machine
EP3421155A1 (en) 2017-06-28 2019-01-02 Parker Hannifin Manufacturing Germany GmbH & Co. KG Hydraulic circuit device for a cold chamber casting machine
DE102018108620A1 (en) 2018-04-11 2018-12-27 Parker Hannifin EMEA S.à.r.l Hydraulic circuit arrangement for a cold or hot chamber die casting machine for the production of metal components

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EP2295171A1 (en) 2011-03-16
HRP20130060T1 (en) 2013-05-31
ES2398532T3 (en) 2013-03-20
SI2295171T1 (en) 2013-04-30
PL2295171T3 (en) 2013-04-30

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