EP3421155A1 - Hydraulic circuit device for a cold chamber casting machine - Google Patents

Hydraulic circuit device for a cold chamber casting machine Download PDF

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Publication number
EP3421155A1
EP3421155A1 EP17178312.9A EP17178312A EP3421155A1 EP 3421155 A1 EP3421155 A1 EP 3421155A1 EP 17178312 A EP17178312 A EP 17178312A EP 3421155 A1 EP3421155 A1 EP 3421155A1
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EP
European Patent Office
Prior art keywords
control valve
working cylinder
piston chamber
pressure booster
line connection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP17178312.9A
Other languages
German (de)
French (fr)
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EP3421155B1 (en
Inventor
Alessandro Pennacchio
Amedeo Carbone
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Parker Hannifin Manufacturing Germany GmbH and Co KG
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Parker Hannifin Manufacturing Germany GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Parker Hannifin Manufacturing Germany GmbH and Co KG filed Critical Parker Hannifin Manufacturing Germany GmbH and Co KG
Priority to EP17178312.9A priority Critical patent/EP3421155B1/en
Priority to CN201810686945.1A priority patent/CN109139573B/en
Publication of EP3421155A1 publication Critical patent/EP3421155A1/en
Application granted granted Critical
Publication of EP3421155B1 publication Critical patent/EP3421155B1/en
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Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • 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
    • B22D17/08—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled
    • 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
    • B22D17/2023—Nozzles or shot sleeves
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators

Definitions

  • the present invention relates to a hydraulic circuit arrangement for a cold chamber die casting machine for the production of metal components, with a battery for providing a hydraulic fluid, with a working cylinder piston chamber having a working cylinder having a first controllable control valve line connection, via which the battery is connected to the working cylinder piston chamber, with a pressure booster piston space and a Druckschreibsetzerstangenraum having pressure intensifier for increasing the pressure in the working cylinder piston chamber, and with a line connection, via which the battery with the pressure booster piston chamber is connected or connected.
  • the invention also relates to a method for operating a cold chamber die casting machine, wherein in a first phase filling of a mold cavity upstream Grebuchse with liquid metal by means of a slow advancing movement of a working cylinder piston rod of a working cylinder, wherein in a second phase, the liquid metal by means of a rapid feed motion the working cylinder piston rod is injected into the mold cavity, and wherein in a third phase the pressure on the working cylinder piston rod is increased by means of a pressure booster during the cooling of the injected metal, the supply of a working cylinder piston chamber of the working cylinder through a first control valve with a hydraulic fluid by means of a battery takes place and also the supply of a pressure booster piston chamber of the pressure booster with the hydraulic fluid by means of the battery.
  • Such a cold chamber die casting machine is used in particular for the production of structural parts of motor vehicles, with ever larger structural parts to be produced with ever more filigree shapes in a cold chamber die casting machine. It is therefore desirable that high pressures may already be present on the working cylinder piston chamber, especially in the second phase.
  • EP 2 295 171 B1 A circuit arrangement and a method with the features mentioned are out EP 2 295 171 B1 known.
  • a check valve in the line connection is always arranged, which connects the working cylinder piston chamber with the pressure booster piston chamber.
  • This check valve ensures after the shooting of the liquid metal in the second phase that a recovery of the hydraulic fluid in the third phase from the working cylinder piston chamber is prevented out, so that an increase in pressure in the working cylinder piston chamber by means of the pressure booster is possible.
  • this check valve reduces the flow area during the supply of the working cylinder piston chamber in the first and second phase and thus the achievable in the working cylinder piston chamber pressure.
  • the check valve must also be regularly maintained and replaced if necessary.
  • EP 2 365 888 B1 suggests, therefore, that the pressure booster itself has a valve seat, which forms with the pressure booster piston a check valve or check valve, which prevents the feeding back from the working cylinder piston chamber in the third phase.
  • the valve seat movable in the Pressure booster is mounted so that the manufacturing cost of the pressure booster and its maintenance costs are increased.
  • the object of the present invention is therefore to overcome the drawbacks described with reference to the prior art, and more particularly to provide a hydraulic circuit arrangement for a cold chamber die casting machine and a method for operating a cold chamber die casting machine, in which a higher force on the working cylinder piston rod in the first and second phase achievable, while reducing the manufacturing and maintenance costs.
  • the object is in particular achieved by a hydraulic circuit arrangement with the features mentioned, in which the first control valve has a blocking position and a passage position and in which there are no internals for closing the line connection in the line connection between the battery and the working cylinder piston chamber behind the first control valve in which a return of the fluid from the working cylinder piston chamber can be prevented by blocking the first control valve, and in which the battery is connected to the pressure booster piston chamber by means of a line connection parallel to the first control valve or is connectable, via which the pressure booster piston space can be acted upon during the pressure increase.
  • the object is also achieved by a method having the features mentioned in the introduction, in which the fluid in the first and second phases is fed from the accumulator to the working cylinder piston chamber through the first control valve and thereafter by no further fittings for closing the corresponding line connection, wherein in the third phase, a recovery from the working cylinder piston chamber is prevented by blocking the first control valve and in which the pressure booster piston chamber is acted upon in the third phase by a parallel to the first control valve line connection from the battery.
  • the invention is therefore beyond the prejudice that the working cylinder piston chamber and the pressure booster piston chamber must be connected via an at least partially common line connection to the battery and that timely prevention of recovery from the working cylinder piston chamber in the transition from the second to the third phase only by means of a passive check valve is possible.
  • the return of the hydraulic fluid from the working cylinder piston space during the third phase according to the invention is prevented by the first control valve, which also controls the advancing movement of the working cylinder piston rod in the first and second phases.
  • the admission of the pressure booster piston chamber with the hydraulic fluid during the third phase takes place by means of a line parallel to the first control valve.
  • the externally controllable first control valve has in addition to its blocking position acting in both directions preferably a variable passage position, so that the feed rate of the working cylinder piston rod in the first and second phase by means of the degree of opening of the passage position is adjustable.
  • the first control valve is arranged to be switchable from a passage position to the full blocking position within less than 50 ms (milliseconds), preferably less than 20 ms or even less than 10 ms.
  • the hydraulic circuit arrangement is set up in particular for a pressure of at least 150 bar.
  • a pressure of at least 150 bar in the battery can be generated, which can be brought via the controllable control valves for acting on the cylinder, wherein the line connections of the circuit arrangement are designed for corresponding pressures.
  • the parallel to the first control valve line connection between the battery and the pressure booster piston chamber is designed without valves.
  • a control valve or other valve is arranged in this parallel to the first control valve line connection.
  • the third phase for increasing the pressure in the working cylinder piston chamber is initiated by opening a line connection connected to the pressure booster rod chamber by means of a corresponding valve so that fluid present here can flow out.
  • this valve is designed as a second controllable control valve, which has a blocking position and a passage position. In the blocking position acting in both directions, therefore, the pressure booster rod space is separated from the rest of the circuit arrangement.
  • the second control valve is in particular designed such that in the passage position of the flow cross section is variable by the second control valve.
  • the second control valve is set up so that the changeover from the blocking position into the passage position can take place within less than 50 ms, preferably less than 20 ms or even less than 10 ms.
  • the second controllable control valve is to be actuated by the pressure booster to increase the pressure in the working cylinder piston chamber. In this case, therefore, no internals in the line connection between the battery and pressure booster piston chamber are present and the third phase is initiated solely by opening the second control valve, while the first control valve is closed.
  • first control valve and the second control valve are arranged so that during a pressure increase in the working cylinder piston chamber by the pressure booster the first control valve completely blocks its line connection and the second control valve makes its line connection at least partially permeable.
  • the first and the second control valve are configured, for example via a higher-level control so that both control valves are switched synchronously. So while the second control valve in the transition from the second phase to the third Phase is opened, the first control valve is simultaneously brought into its blocking position.
  • the second control valve is switched at least partially permeable, wherein in particular the first control valve and the second control valve are synchronously and preferably switched simultaneously.
  • a third control valve is arranged, which is open at least during the third phase and which is closed after the end of the third phase when returning, and in a leading from the pressure booster piston chamber to a tank line connection a fourth control valve is arranged, which is closed in the first three phases and open to return the pressure booster piston.
  • the return of the pressure booster piston is then in particular the fact that the battery or a pump is connected to the pressure booster rod space.
  • the figure shows a schematic hydraulic circuit arrangement for a cold chamber die casting machine.
  • the cold chamber die casting machine includes a die 50 having a mold cavity 51 therein to be filled with the hot liquid metal.
  • the mold cavity 51 is preceded by a stuffing box 52.
  • a working cylinder 20 For introducing the liquid metal in the Golfbüchse 52 and the mold cavity 51 is a working cylinder 20 provided.
  • the working cylinder 20 comprises a working cylinder piston 24 with a one-sided working piston rod 23, wherein the working cylinder piston rod 23 is arranged for retraction into the Artbüchse 52 to push out the filled into the Artbüchse 52 metal in the mold cavity 51.
  • the working cylinder piston 24 divides the working cylinder 20 into a working cylinder piston chamber 21 and into a working cylinder rod space 22.
  • pressure is the working cylinder 20 associated with a pressure booster 30 having a pressure booster piston 34 with a one-sided pressure booster piston rod 33rd includes, wherein the pressure booster piston rod 33 is arranged for retraction into the working cylinder piston chamber 21.
  • the pressure booster piston 34 divides the pressure intensifier interior into a pressure booster piston chamber 31 and a pressure booster rod chamber 32.
  • a battery 10 is provided for pressurizing working cylinder piston chamber 21 and pressure booster piston chamber 31, a battery 10 is provided.
  • the battery 10 can be filled by a first pump 71, wherein in the line between the first pump 71 and the battery 10, a first check valve 61 is turned on to allow the filling of the battery 10 by the first pump 71, but in the opposite direction to prevent a backflow of the fluid to the battery 10 in the direction of the first pump 71.
  • a battery working cylinder piston chamber line connection 11 For feeding or acting on the working cylinder piston chamber 21 performs a battery working cylinder piston chamber line connection 11 from the battery 10 to the working cylinder piston chamber 21.
  • a first controllable control valve 41 is arranged in the battery working cylinder piston chamber line connection 11.
  • the first controllable control valve 41 has a blocking position and a variable passage position.
  • In the battery working cylinder piston space line connection 11 is behind the first control valve 41 no further device for obstructing the line.
  • a rechargeable battery pressure booster piston chamber line connection 12 is provided, which connects the battery 10 directly to the pressure booster piston chamber 21.
  • the battery 10 is thus connected directly to the pressure booster piston chamber 31 via the battery pressure booster piston chamber connection 12, wherein a third control valve 43 is arranged in the battery pressure booster piston chamber duct connection 12.
  • a pressure booster rod space line connection 13 is connected, which leads to a second controllable control valve 42 and a pressure control valve 48 connected downstream of this. From the pressure control valve 48 leads a line to the battery 10.
  • the pressure control valve 48 also has a connection to a tank 80, so that the displaced from the pressure booster chamber 32 fluid can be discharged to the tank 80.
  • a pressure booster piston space load line connection 14 in which a fourth controllable control valve 44 is arranged and which leads to a tank 80.
  • a fifth controllable control valve 45 in the form of a multiway valve with a plurality of connections a, b, c is connected to this.
  • a first port a connects the fifth control valve 45 to a tank 80, so that when more responsive Position of the fifth control valve 45 of the pressure cylinder rod space 22 to the tank 80 can be relieved.
  • a second connection b of the fifth control valve 45 is connected by means of a line with a multiplier 90 as a pressure booster.
  • the multiplier 90 has a multiplier piston 94 with one-sided impacted multiplier piston rod 93, wherein the multiplier piston 94 divides the interior of the multiplier 90 into a multiplier piston chamber 91 and a multiplier rod chamber 92.
  • the Multiplikatorstangenraum 92 leads a line to the battery 10, in which a second check valve 62 is turned on with a directed toward the battery 10 towards the direction of passage.
  • a further connection c of the fifth control valve 45 is connected via a line to the battery 10, wherein in this line a third check valve 63 is turned on with a directed towards the battery 10 passage direction.
  • the working cylinder piston chamber 21 After the end of the working cycle, the working cylinder piston chamber 21 must first be relieved of the fluid present therein at a high pressure multiplied by the pressure booster 30, and for this purpose the working cylinder piston chamber 21 can be connected to a tank 80 via a sixth controllable control valve 46.
  • the first pump 71, the sixth control valve 46 is connected downstream.
  • the outgoing from the sixth control valve 46 lines lead to the working cylinder piston chamber 21 and the working cylinder rod chamber 22.
  • appropriate circuit of the sixth control valve 46 can thus by applying the cylinder rod space 22 by the first Pump 71 funded fluid of the working cylinder piston 24 are returned to its original position, wherein the displaced from the working cylinder piston chamber 21 fluid via the sixth control valve 46 flows to the tank 80.
  • the multiplier 90 is a corresponding seventh control valve 47 is provided with connection to a second pump 72 and a tank 80, wherein the seventh control valve 47 are connected by means of corresponding lines with the Multiplikatorkolbenraum 91 and the Multiplikatorstangenraum 92. In this way, a reset of the multiplier 90 is also given here.
  • the battery 10 Before starting a working cycle, the battery 10 is filled and charged by the first pump 71, wherein a return flow through the first check valve 61 is prevented. In this phase, the sixth control valve 46 is in its blocking position. Before the start of the duty cycle are also the first control valve 41 and the second control valve 42 in its blocking position.
  • the first control valve 41 is partially opened so that fluid 10 can flow into the working cylinder piston chamber 21 from the battery. Due to the regulation of the fluid flow by means of the first control valve 41, the speed of the method of the working cylinder piston 24 for filling the filling sleeve 52 can be regulated.
  • the filling bushing 52 is filled and if the metal contained therein is now to be injected into the mold cavity 51 of the pressure casting mold 50 in the second phase, another ancestor of the working cylinder piston 24 takes place at high speed.
  • the fifth control valve 45 is placed in a position in which the fluid displaced from the working cylinder rod space 22 is supplied to the multiplier 90. Due to the area ratios on the multiplier piston 94 with multiplier piston rod 93, an increase in the pressure for the fluid expelled from the multiplier 90 takes place in the multiplier rod chamber 92, which is conducted via the second check valve 62 to the battery 10, wherein the pressure generated by the pressure increase in the battery 10th given pressure corresponds.
  • the first control valve 41 is brought into a low open position, so that the working cylinder piston chamber 21 is acted upon only with a small amount of fluid.
  • the fifth control valve 45 is again brought into a position (position c) in which the working cylinder rod space 22 is connected to the battery 10, so that the fluid expelled from the working cylinder rod space 22 is fed back into the battery 10.
  • the build-up in this short phase high system pressure in the working cylinder rod space 22 ensures that the piston movement is reduced delay in a few milliseconds to the desired value, the excess energy is fed back into the battery 10 tip-free in the form of fluid pressure.
  • the first control valve 41 is completely closed and spent in its blocking position, whereby a return of hydraulic fluid from the working cylinder piston chamber 21 is prevented.
  • the second control valve 42 is fully opened to initiate the third phase, with the third control valve 43 open, so that the pressure booster piston 34 moves in the direction of the working cylinder 20 and increases the pressure in the working cylinder piston chamber 21.
  • the fluid exiting the pressure booster rod chamber 32 is via the second Control valve 42 and the pressure control valve 48 to the tank 80 derived.
  • the third control valve 43 is closed, so that the pressure booster chamber 32 is connected to the battery 10 via the pressure control valve 48 and the second control valve 42, which is open during the return travel.
  • the fourth control valve 44 is opened, so that the displaced from the pressure booster piston chamber 31 fluid can be displaced into the tank 80.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

Die Erfindung betrifft eine hydraulische Schaltungsanordnung für eine Kaltkammerdruckgussmaschine zur Herstellung von Metallbauteilen, mit einem Akku (10) zur Bereitstellung eines Hydraulikfluides, mit einem einen Arbeitszylinderkolbenraum (21) aufweisenden Arbeitszylinder (20), mit einer ein erstes ansteuerbares Steuerventil (41) aufweisenden Leitungsverbindung, über die der Akku (10) mit dem Arbeitszylinderkolbenraum (21) verbindbar ist, mit einem einen Druckübersetzerkolbenraum (31) und einen Druckübersetzerstangenraum (32) aufweisenden Druckübersetzer (30) zur Druckerhöhung in dem Arbeitszylinderkolbenraum (21), und mit einer Leitungsverbindung, über die der Akku (10) mit dem Druckübersetzerkolbenraum (31) verbindbar oder verbunden ist, welches dadurch gekennzeichnet, dass das erste Steuerventil (41) eine Sperrstellung und eine Durchlassstellung aufweist, dass in der Leitungsverbindung (11) zwischen dem Akku (10) und dem Arbeitszylinderkolbenraum (21) hinter dem ersten Steuerventil (41) keine Einbauten zum Verschließen der Leitungsverbindung (11) vorhanden sind, so dass eine Rückspeisung des Fluides aus dem Arbeitszylinderkolbenraum (21) heraus durch Sperren des ersten Steuerventils (41) unterbindbar ist, und dass der Akku (10) mittels einer zu dem ersten Steuerventil (41) parallelen Leitungsverbindung (12) mit dem Druckübersetzerkolbenraum (31) verbunden oder verbindbar ist, über die der Druckübersetzerkolbenraum (31) während der Druckerhöhung beaufschlagbar ist.

Figure imgaf001
The invention relates to a hydraulic circuit arrangement for a cold chamber die casting machine for producing metal components, having a battery (10) for providing a hydraulic fluid, having a working cylinder (20) having a working cylinder piston space (21), with a line connection having a first controllable control valve (41), via which the accumulator (10) with the Arbeitszylinderkolbenraum (21) is connectable, with a Druckübersetzerkolbenraum (31) and a Druckübersetzerstangenraum (32) having pressure intensifier (30) for pressure increase in the working cylinder piston chamber (21), and with a line connection, via the the rechargeable battery (10) can be connected or connected to the pressure booster piston chamber (31), which has the first control valve (41) a blocking position and a passage position that in the line connection (11) between the battery (10) and the working cylinder piston chamber (21) behind the first STE Erventil (41) no internals for closing the line connection (11) are present, so that a return of the fluid from the working cylinder piston chamber (21) out by blocking the first control valve (41) can be prevented, and that the battery (10) by means of a the first control valve (41) parallel line connection (12) with the pressure booster piston chamber (31) is connected or connectable via which the pressure booster piston chamber (31) can be acted upon during the pressure increase.
Figure imgaf001

Description

Die vorliegende Erfindung betrifft eine hydraulische Schaltungsanordnung für eine Kaltkammerdruckgussmaschine zur Herstellung von Metallbauteilen, mit einem Akku zur Bereitstellung eines Hydraulikfluides, mit einem einen Arbeitszylinderkolbenraum aufweisenden Arbeitszylinder, mit einer ein erstes ansteuerbares Steuerventil aufweisenden Leitungsverbindung, über die der Akku mit dem Arbeitszylinderkolbenraum verbindbar ist, mit einem einen Druckübersetzerkolbenraum und einen Druckübersetzerstangenraum aufweisenden Druckübersetzer zur Druckerhöhung in dem Arbeitszylinderkolbenraum, und mit einer Leitungsverbindung, über die der Akku mit dem Druckübersetzerkolbenraum verbindbar oder verbunden ist. Die Erfindung betrifft zudem ein Verfahren zum Betreiben einer Kaltkammerdruckgussmaschine, bei welchem in einer ersten Phase das Befüllen einer einem Formhohlraum vorgeschalteten Füllbüchse mit flüssigem Metall mittels einer langsamen Vorschubbewegung einer Arbeitszylinderkolbenstange eines Arbeitszylinders erfolgt, bei welchem in einer zweiten Phase das flüssige Metall mittels einer schnellen Vorschubbewegung der Arbeitszylinderkolbenstange in den Formhohlraum eingeschossen wird, und bei welchem in einer dritten Phase der Druck auf die Arbeitszylinderkolbenstange mittels eines Druckübersetzers während des Auskühlens des eingeschossenen Metalls erhöht ist, wobei die Versorgung eines Arbeitszylinderkolbenraums des Arbeitszylinders durch ein erstes Steuerventil hindurch mit einem Hydraulikfluid mittels eines Akkus erfolgt und auch die Versorgung eines Druckübersetzerkolbenraums des Druckübersetzers mit dem Hydraulikfluid mittels des Akkus erfolgt.The present invention relates to a hydraulic circuit arrangement for a cold chamber die casting machine for the production of metal components, with a battery for providing a hydraulic fluid, with a working cylinder piston chamber having a working cylinder having a first controllable control valve line connection, via which the battery is connected to the working cylinder piston chamber, with a pressure booster piston space and a Druckübersetzerstangenraum having pressure intensifier for increasing the pressure in the working cylinder piston chamber, and with a line connection, via which the battery with the pressure booster piston chamber is connected or connected. The invention also relates to a method for operating a cold chamber die casting machine, wherein in a first phase filling of a mold cavity upstream Füllbuchse with liquid metal by means of a slow advancing movement of a working cylinder piston rod of a working cylinder, wherein in a second phase, the liquid metal by means of a rapid feed motion the working cylinder piston rod is injected into the mold cavity, and wherein in a third phase the pressure on the working cylinder piston rod is increased by means of a pressure booster during the cooling of the injected metal, the supply of a working cylinder piston chamber of the working cylinder through a first control valve with a hydraulic fluid by means of a battery takes place and also the supply of a pressure booster piston chamber of the pressure booster with the hydraulic fluid by means of the battery.

Eine solche Kaltkammerdruckgussmaschine wird insbesondere zur Herstellung von Strukturteilen von Kraftfahrzeugen eingesetzt, wobei immer größere Strukturteile mit immer filigraneren Formen in einer Kaltkammerdruckgussmaschine hergestellt werden sollen. Es ist daher wünschenswert, dass bereits insbesondere in der zweiten Phase hohe Drücke an dem Arbeitszylinderkolbenraum anliegen können.Such a cold chamber die casting machine is used in particular for the production of structural parts of motor vehicles, with ever larger structural parts to be produced with ever more filigree shapes in a cold chamber die casting machine. It is therefore desirable that high pressures may already be present on the working cylinder piston chamber, especially in the second phase.

Eine Schaltungsanordnung und ein Verfahren mit den eingangs genannten Merkmalen sind aus EP 2 295 171 B1 bekannt. Bei den vorbekannten Schaltungsanordnungen für eine Kaltkammerdruckgussmaschine ist immer ein Rückschlagventil in der Leitungsverbindung angeordnet, die den Arbeitszylinderkolbenraum mit dem Druckübersetzerkolbenraum verbindet. Dieses Rückschlagventil sorgt nach dem Einschießen des flüssigen Metalls in der zweiten Phase dafür, dass eine Rückspeisung des Hydraulikfluides in der dritten Phase aus dem Arbeitszylinderkolbenraum heraus verhindert wird, so dass eine Druckerhöhung im Arbeitszylinderkolbenraum mittels des Druckübersetzers möglich ist. Dieses Rückschlagventil verringert allerdings den Durchflussquerschnitt während der Speisung des Arbeitszylinderkolbenraumes in der ersten und zweiten Phase und somit den in dem Arbeitszylinderkolbenraum erreichbaren Druck. Das Rückschlagventil muss zudem regelmäßig gewartet und gegebenenfalls ausgetauscht werden.A circuit arrangement and a method with the features mentioned are out EP 2 295 171 B1 known. In the previously known circuit arrangements for a cold chamber die casting machine, a check valve in the line connection is always arranged, which connects the working cylinder piston chamber with the pressure booster piston chamber. This check valve ensures after the shooting of the liquid metal in the second phase that a recovery of the hydraulic fluid in the third phase from the working cylinder piston chamber is prevented out, so that an increase in pressure in the working cylinder piston chamber by means of the pressure booster is possible. However, this check valve reduces the flow area during the supply of the working cylinder piston chamber in the first and second phase and thus the achievable in the working cylinder piston chamber pressure. The check valve must also be regularly maintained and replaced if necessary.

EP 2 365 888 B1 schlägt daher vor, dass der Druckübersetzer selbst einen Ventilsitz aufweist, welcher mit dem Druckübersetzerkolben ein Sperr- oder Rückschlagventil ausbildet, welches die Rückspeisung aus dem Arbeitszylinderkolbenraum in der dritten Phase unterbindet. Für die Ausbildung dieser Funktion ist es aber erforderlich, dass der Ventilsitz beweglich in dem Druckübersetzer gelagert ist, so dass die Herstellungskosten des Druckübersetzers und dessen Wartungsaufwand erhöht sind. EP 2 365 888 B1 suggests, therefore, that the pressure booster itself has a valve seat, which forms with the pressure booster piston a check valve or check valve, which prevents the feeding back from the working cylinder piston chamber in the third phase. For the training of this function, it is necessary that the valve seat movable in the Pressure booster is mounted so that the manufacturing cost of the pressure booster and its maintenance costs are increased.

Aufgabe der vorliegenden Erfindung ist es daher, die mit Bezug zum Stand der Technik geschilderten Nachteile zu überwinden und insbesondere eine hydraulische Schaltungsanordnung für eine Kaltkammerdruckgussmaschine sowie ein Verfahren zum Betreiben einer Kaltkammerdruckgussmaschine anzugeben, bei denen in der ersten und zweiten Phase eine höhere Kraft an der Arbeitszylinderkolbenstange erzielbar ist, bei gleichzeitiger Verringerung des Herstellungs- und Wartungsaufwands.The object of the present invention is therefore to overcome the drawbacks described with reference to the prior art, and more particularly to provide a hydraulic circuit arrangement for a cold chamber die casting machine and a method for operating a cold chamber die casting machine, in which a higher force on the working cylinder piston rod in the first and second phase achievable, while reducing the manufacturing and maintenance costs.

Die Aufgabe wird gelöst durch eine hydraulische Schaltungsanordnung und ein Verfahren mit den Merkmalen des jeweiligen unabhängigen Anspruchs. Vorteilhafte Weiterbildungen der Schaltungsanordnung und des Verfahrens sind in den abhängigen Ansprüchen und in der Beschreibung angegeben, wobei einzelne Merkmale der vorteilhaften Weiterbildungen in technisch sinnvoller Weise beliebig miteinander kombinierbar sind, wobei die mit Bezug zum Verfahren beschriebenen Merkmale und Vorteile auf die Schaltungsanordnung übertragbar und anwendbar, wie auch umgekehrt.The object is achieved by a hydraulic circuit arrangement and a method having the features of the respective independent claim. Advantageous developments of the circuit arrangement and the method are specified in the dependent claims and in the description, wherein individual features of the advantageous developments in a technically meaningful way can be combined with each other, where described with respect to the features and advantages transferable to the circuit arrangement and applicable, as well as vice versa.

Die Aufgabe wird insbesondere gelöst durch eine hydraulische Schaltungsanordnung mit den eingangs genannten Merkmalen, bei der das erste Steuerventil eine Sperrstellung und eine Durchlassstellung aufweist und bei der in der Leitungsverbindung zwischen dem Akku und dem Arbeitszylinderkolbenraum hinter dem ersten Steuerventil keine Einbauten zum Verschließen der Leitungsverbindung vorhanden sind, wobei eine Rückspeisung des Fluids aus dem Arbeitszylinderkolbenraum heraus durch Sperren des ersten Steuerventils unterbindbar ist, und bei dem der Akku mittels einer zu dem ersten Steuerventil parallelen Leitungsverbindung mit dem Druckübersetzerkolbenraum verbunden oder verbindbar ist, über die der Druckübersetzerkolbenraum während der Druckerhöhung beaufschlagbar ist.The object is in particular achieved by a hydraulic circuit arrangement with the features mentioned, in which the first control valve has a blocking position and a passage position and in which there are no internals for closing the line connection in the line connection between the battery and the working cylinder piston chamber behind the first control valve in which a return of the fluid from the working cylinder piston chamber can be prevented by blocking the first control valve, and in which the battery is connected to the pressure booster piston chamber by means of a line connection parallel to the first control valve or is connectable, via which the pressure booster piston space can be acted upon during the pressure increase.

Die Aufgabe wird auch durch ein Verfahren mit den eingangs genannten Merkmalen gelöst, bei dem das Fluid in der ersten und zweiten Phase von dem Akku zu dem Arbeitszylinderkolbenraum durch das erste Steuerventil hindurch und danach durch keine weiteren Einbauten zum Schließen der entsprechenden Leitungsverbindung gespeist wird, wobei in der dritten Phase eine Rückspeisung aus dem Arbeitszylinderkolbenraum durch Sperren des ersten Steuerventils unterbunden wird und bei dem der Druckübersetzerkolbenraum in der dritten Phase durch eine zu dem ersten Steuerventil parallele Leitungsverbindung von dem Akku beaufschlagt wird.The object is also achieved by a method having the features mentioned in the introduction, in which the fluid in the first and second phases is fed from the accumulator to the working cylinder piston chamber through the first control valve and thereafter by no further fittings for closing the corresponding line connection, wherein in the third phase, a recovery from the working cylinder piston chamber is prevented by blocking the first control valve and in which the pressure booster piston chamber is acted upon in the third phase by a parallel to the first control valve line connection from the battery.

Die Erfindung setzt sich somit über das Vorurteil hinweg, dass der Arbeitszylinderkolbenraum und der Druckübersetzerkolbenraum über eine zumindest abschnittsweise gemeinsame Leitungsverbindung mit dem Akku verbunden sein müssen und dass eine rechtzeitige Verhinderung der Rückspeisung aus dem Arbeitszylinderkolbenraum beim Übergang von der zweiten in die dritte Phase nur mittels eines passiven Rückschlageventils möglich ist.The invention is therefore beyond the prejudice that the working cylinder piston chamber and the pressure booster piston chamber must be connected via an at least partially common line connection to the battery and that timely prevention of recovery from the working cylinder piston chamber in the transition from the second to the third phase only by means of a passive check valve is possible.

Demgegenüber wird die Rückspeisung des Hydraulikfluids aus dem Arbeitszylinderkolbenraum während der dritten Phase erfindungsgemäß durch das erste Steuerventil verhindert, welches auch die Vorschubbewegung der Arbeitszylinderkolbenstange in der ersten und zweiten Phase steuert. Die Beaufschlagung des Druckübersetzerkolbenraums mit dem Hydraulikfluid während der dritten Phase erfolgt dagegen mittels einer zu dem ersten Steuerventil parallelen Leitung. Durch das Weglassen eines Rückschlagventils oder einer die Funktion des Rückschlagventils übernehmenden Vorrichtung in der Leitungsverbindung zwischen dem ersten Steuerventil und dem Arbeitszylinderkolbenraum kann schon während der ersten und/oder der zweiten Phase ein höherer Druck in dem Druckzylinderkolbenraum zur Anlage gebracht werden, so dass höhere Kräfte auf den Arbeitszylinderkolben wirken können, wodurch größere und/oder filigranere Bauteile herstellbar und/oder eine schnellere Einschusszeit in der zweiten Phase erreichbar sind. Da diese Vorteile ohne weitere mechanische Bauteile erreicht werden, sind die Herstellungskosten und der Wartungsaufwand einer solchen Kaltkammerdruckgussmaschine verringert. Somit wird auch die Standzeit der Kaltkammerdruckgussmaschine verringert.In contrast, the return of the hydraulic fluid from the working cylinder piston space during the third phase according to the invention is prevented by the first control valve, which also controls the advancing movement of the working cylinder piston rod in the first and second phases. By contrast, the admission of the pressure booster piston chamber with the hydraulic fluid during the third phase takes place by means of a line parallel to the first control valve. By omitting a check valve or a device which takes over the function of the check valve in the line connection between the first control valve and the working cylinder piston chamber can already during the first and / or the second phase, a higher Pressure in the pressure cylinder piston chamber are brought to bear, so that higher forces can act on the working cylinder piston, whereby larger and / or filigree components produced and / or a faster shot time can be achieved in the second phase. Since these advantages are achieved without further mechanical components, the manufacturing costs and maintenance of such a cold chamber die casting machine are reduced. Thus, the life of the cold chamber die casting machine is reduced.

Das extern ansteuerbare erste Steuerventil weist neben seiner in beide Richtungen wirkenden Sperrstellung bevorzugt eine veränderbare Durchlassstellung auf, so dass die Vorschubgeschwindigkeit der Arbeitszylinderkolbenstange in der ersten und zweiten Phase mittels des Grades der Öffnung der Durchlassstellung einstellbar ist. Das erste Steuerventil ist insbesondere so eingerichtet, dass es aus einer Durchlassstellung in die vollständige Sperrstellung innerhalb von weniger als 50 ms (Millisekunden), bevorzugt von weniger als 20 ms oder sogar von weniger als 10 ms schaltbar ist.The externally controllable first control valve has in addition to its blocking position acting in both directions preferably a variable passage position, so that the feed rate of the working cylinder piston rod in the first and second phase by means of the degree of opening of the passage position is adjustable. In particular, the first control valve is arranged to be switchable from a passage position to the full blocking position within less than 50 ms (milliseconds), preferably less than 20 ms or even less than 10 ms.

Die hydraulische Schaltungsanordnung ist insbesondere für einen Druck von mindestens 150 bar eingerichtet. Insbesondere ist ein Druck von mindestens 150 bar in dem Akku erzeugbar, welcher über die ansteuerbaren Steuerventile zur Beaufschlagung der Zylinder gebracht werden kann, wobei auch die Leitungsverbindungen der Schaltungsanordnung für entsprechende Drücke ausgelegt sind.The hydraulic circuit arrangement is set up in particular for a pressure of at least 150 bar. In particular, a pressure of at least 150 bar in the battery can be generated, which can be brought via the controllable control valves for acting on the cylinder, wherein the line connections of the circuit arrangement are designed for corresponding pressures.

Bevorzugt ist die zu dem ersten Steuerventil parallele Leitungsverbindung zwischen dem Akku und dem Druckübersetzerkolbenraum ohne Ventile ausgeführt. Es kann aber vorgesehen sein, dass in dieser zu dem ersten Steuerventil parallelen Leitungsverbindung ein Steuerventil oder anderes Ventil angeordnet ist.Preferably, the parallel to the first control valve line connection between the battery and the pressure booster piston chamber is designed without valves. However, it can be provided that in this parallel to the first control valve line connection, a control valve or other valve is arranged.

In der Regel wird die dritte Phase zur Druckerhöhung im Arbeitszylinderkolbenraum dadurch eingeleitet, dass eine an dem Druckübersetzerstangenraum angeschlossene Leitungsverbindung mittels eines entsprechenden Ventils geöffnet wird, so dass hier anstehendes Fluid abströmen kann. Bevorzugt ist dieses Ventil als ein zweites ansteuerbares Steuerventil ausgebildet, welches eine Sperrstellung und eine Durchlassstellung aufweist. In der in beide Richtungen wirkenden Sperrstellung ist also der Druckübersetzerstangenraum von der übrigen Schaltungsanordnung getrennt. Das zweite Steuerventil ist insbesondere so ausgebildet, dass in der Durchlassstellung der Strömungsquerschnitt durch das zweite Steuerventil veränderbar ist. Insbesondere ist das zweite Steuerventil so eingerichtet, dass die Umschaltung von der Sperrstellung in die Durchlassstellung innerhalb von weniger als 50 ms, bevorzugt weniger als 20 ms oder sogar von weniger als 10 ms erfolgen kann.As a rule, the third phase for increasing the pressure in the working cylinder piston chamber is initiated by opening a line connection connected to the pressure booster rod chamber by means of a corresponding valve so that fluid present here can flow out. Preferably, this valve is designed as a second controllable control valve, which has a blocking position and a passage position. In the blocking position acting in both directions, therefore, the pressure booster rod space is separated from the rest of the circuit arrangement. The second control valve is in particular designed such that in the passage position of the flow cross section is variable by the second control valve. In particular, the second control valve is set up so that the changeover from the blocking position into the passage position can take place within less than 50 ms, preferably less than 20 ms or even less than 10 ms.

In diesem Zusammenhang ist insbesondere bevorzugt, dass zur Druckerhöhung in dem Arbeitszylinderkolbenraum durch den Druckübersetzer ausschließlich das zweite ansteuerbare Steuerventil zu betätigen ist. In diesem Fall sind also keine Einbauten in der Leitungsverbindung zwischen Akku und Druckübersetzerkolbenraum vorhanden und die dritte Phase wird alleine durch Öffnen des zweiten Steuerventils eingeleitet, während gleichzeitig das erste Steuerventil geschlossen wird.In this context, it is particularly preferred that only the second controllable control valve is to be actuated by the pressure booster to increase the pressure in the working cylinder piston chamber. In this case, therefore, no internals in the line connection between the battery and pressure booster piston chamber are present and the third phase is initiated solely by opening the second control valve, while the first control valve is closed.

Es ist insbesondere bevorzugt, dass das erste Steuerventil und das zweite Steuerventil so eingerichtet sind, dass während einer Druckerhöhung im Arbeitszylinderkolbenraum durch den Druckübersetzer das erste Steuerventil seine Leitungsverbindung vollständig sperrt und das zweite Steuerventil seine Leitungsverbindung zumindest teilweise durchlässig macht. Das erste und das zweite Steuerventil sind beispielsweise über eine übergeordnete Steuerung so eingerichtet, dass beide Steuerventile synchron geschaltet werden. Während also das zweite Steuerventil beim Übergang von der zweiten Phase in die dritte Phase geöffnet wird, wird das erste Steuerventil gleichzeitig in seine Sperrstellung gebracht.It is particularly preferred that the first control valve and the second control valve are arranged so that during a pressure increase in the working cylinder piston chamber by the pressure booster the first control valve completely blocks its line connection and the second control valve makes its line connection at least partially permeable. The first and the second control valve are configured, for example via a higher-level control so that both control valves are switched synchronously. So while the second control valve in the transition from the second phase to the third Phase is opened, the first control valve is simultaneously brought into its blocking position.

In der dritten Phase wird also das zweite Steuerventil zumindest teilweise durchlässig geschaltet, wobei insbesondere das erste Steuerventil und das zweite Steuerventil synchron und bevorzugt gleichzeitig geschaltet werden.In the third phase, therefore, the second control valve is switched at least partially permeable, wherein in particular the first control valve and the second control valve are synchronously and preferably switched simultaneously.

Nach Ende der dritten Phase kann der Arbeitszylinderkolben in seine Ausgangsstellung zurückgefahren werden, und zwar wie dies in der eingangs genannten EP 2 295 171 A1 beschrieben ist. Zum Rückfahren des Druckübersetzerkolbens nach Ende der dritten Phase kann vorgesehen sein, dass in der Leitungsverbindung vom Akku zum Druckübersetzerkolbenraum ein drittes Steuerventil angeordnet ist, welches zumindest während der dritten Phase geöffnet ist und welches nach dem Ende der dritten Phase beim Zurückfahren geschlossen ist, und dass in einer von dem Druckübersetzerkolbenraum zu einem Tank führenden Leitungsverbindung ein viertes Steuerventil angeordnet ist, welches in den ersten drei Phasen geschlossen und zum Rückfahren des Druckübersetzerkolbens geöffnet ist. Das Rückfahren des Druckübersetzerkolbens erfolgt dann insbesondere dadurch, dass der Akku oder eine Pumpe mit dem Druckübersetzerstangenraum verbunden wird.After the end of the third phase of the working cylinder piston can be moved back to its original position, as in the aforementioned EP 2 295 171 A1 is described. To return the pressure booster piston after the end of the third phase can be provided that in the line connection from the battery to Druckübersetzerkolbenraum a third control valve is arranged, which is open at least during the third phase and which is closed after the end of the third phase when returning, and in a leading from the pressure booster piston chamber to a tank line connection a fourth control valve is arranged, which is closed in the first three phases and open to return the pressure booster piston. The return of the pressure booster piston is then in particular the fact that the battery or a pump is connected to the pressure booster rod space.

Die Erfindung sowie das technische Umfeld werden im Folgenden anhand der Figur beispielhaft erläutert.The invention and the technical environment are explained below by way of example with reference to FIG.

Die Figur zeigt eine schematische hydraulische Schaltungsanordnung für eine Kaltkammerdruckgussmaschine. Die Kaltkammerdruckgussmaschine umfasst eine Druckgussform 50 mit einem darin angeordneten Formhohlraum 51, der mit dem heißen flüssigen Metall zu füllen ist. Dem Formhohlraum 51 ist eine Füllbüchse 52 vorgeschaltet. Zum Einbringen des flüssigen Metalls in die Füllbüchse 52 beziehungsweise den Formhohlraum 51 ist ein Arbeitszylinder 20 vorgesehen. Der Arbeitszylinder 20 umfasst einen Arbeitszylinderkolben 24 mit einseitiger Arbeitszylinderkolbenstange 23, wobei die Arbeitszylinderkolbenstange 23 zum Einfahren in die Füllbüchse 52 eingerichtet ist, um das in die Füllbüchse 52 eingefüllte Metall in den Formhohlraum 51 auszuschieben. Der Arbeitszylinderkolben 24 unterteilt den Arbeitszylinder 20 in einen Arbeitszylinderkolbenraum 21 und in einen Arbeitszylinderstangenraum 22. Im Hinblick auf eine während des Druckgießens erforderlichen Erhöhung des im Arbeitszylinderkolbenraums 21 anstehenden Druckes ist dem Arbeitszylinder 20 ein Druckübersetzer 30 zugeordnet, der einen Druckübersetzerkolben 34 mit einer einseitigen Druckübersetzerkolbenstange 33 umfasst, wobei die Druckübersetzerkolbenstange 33 zum Einfahren in den Arbeitszylinderkolbenraum 21 eingerichtet ist. Der Druckübersetzerkolben 34 unterteilt den Druckübersetzerinnenraum in einen Druckübersetzerkolbenraum 31 und einen Druckübersetzerstangenraum 32.The figure shows a schematic hydraulic circuit arrangement for a cold chamber die casting machine. The cold chamber die casting machine includes a die 50 having a mold cavity 51 therein to be filled with the hot liquid metal. The mold cavity 51 is preceded by a stuffing box 52. For introducing the liquid metal in the Füllbüchse 52 and the mold cavity 51 is a working cylinder 20 provided. The working cylinder 20 comprises a working cylinder piston 24 with a one-sided working piston rod 23, wherein the working cylinder piston rod 23 is arranged for retraction into the Füllbüchse 52 to push out the filled into the Füllbüchse 52 metal in the mold cavity 51. The working cylinder piston 24 divides the working cylinder 20 into a working cylinder piston chamber 21 and into a working cylinder rod space 22. In view of a required during die casting increase in the working cylinder piston chamber 21 pressure is the working cylinder 20 associated with a pressure booster 30 having a pressure booster piston 34 with a one-sided pressure booster piston rod 33rd includes, wherein the pressure booster piston rod 33 is arranged for retraction into the working cylinder piston chamber 21. The pressure booster piston 34 divides the pressure intensifier interior into a pressure booster piston chamber 31 and a pressure booster rod chamber 32.

Zur Druckbeaufschlagung von Arbeitszylinderkolbenraum 21 und Druckübersetzerkolbenraum 31 ist ein Akku 10 vorgesehen. Der Akku 10 kann von einer ersten Pumpe 71 füllbar sein, wobei in der Leitung zwischen der ersten Pumpe 71 und dem Akku 10 ein erstes Rückschlagventil 61 eingeschaltet ist, um das Füllen des Akkus 10 durch die erste Pumpe 71 zu ermöglichen, in der Gegenrichtung aber einen Rückfluss des Fluids zum Akku 10 in Richtung der ersten Pumpe 71 zu verhindern.For pressurizing working cylinder piston chamber 21 and pressure booster piston chamber 31, a battery 10 is provided. The battery 10 can be filled by a first pump 71, wherein in the line between the first pump 71 and the battery 10, a first check valve 61 is turned on to allow the filling of the battery 10 by the first pump 71, but in the opposite direction to prevent a backflow of the fluid to the battery 10 in the direction of the first pump 71.

Zur Speisung beziehungsweise Beaufschlagung des Arbeitszylinderkolbenraums 21 führt eine Akku-Arbeitszylinderkolbenraum-Leitungsverbindung 11 von dem Akku 10 zu dem Arbeitszylinderkolbenraum 21. In der Akku-Arbeitszylinderkolbenraum-Leitungsverbindung 11 ist ein erstes ansteuerbares Steuerventil 41 angeordnet. Das erste ansteuerbare Steuerventil 41 weist eine Sperrstellung und eine veränderbare Durchlassstellung auf. In der Akku-Arbeitszylinderkolbenraum-Leitungsverbindung 11 befindet sich hinter dem ersten Steuerventil 41 keine weitere Vorrichtung zur Versperrung der Leitung.For feeding or acting on the working cylinder piston chamber 21 performs a battery working cylinder piston chamber line connection 11 from the battery 10 to the working cylinder piston chamber 21. In the battery working cylinder piston chamber line connection 11, a first controllable control valve 41 is arranged. The first controllable control valve 41 has a blocking position and a variable passage position. In the battery working cylinder piston space line connection 11 is behind the first control valve 41 no further device for obstructing the line.

Zur Speisung beziehungsweise Beaufschlagung des Druckübersetzerkolbenraumes 31 mit dem Hydraulikfluid ist eine Akku-Druckübersetzerkolbenraum-Leitungsverbindung 12 vorgesehen, die den Akku 10 unmittelbar mit dem Druckübersetzerkolbenraum 21 verbindet. Der Akku 10 ist somit unmittelbar über die Akku-Druckübersetzerkolbenraum-Leitungsverbindung 12 mit dem Druckübersetzerkolbenraum 31 verbunden, wobei in der Akku-Druckübersetzerkolbenraum-Leitungsverbindung 12 ein drittes Steuerventil 43 angeordnet ist.For supplying or pressurizing the pressure booster piston chamber 31 with the hydraulic fluid, a rechargeable battery pressure booster piston chamber line connection 12 is provided, which connects the battery 10 directly to the pressure booster piston chamber 21. The battery 10 is thus connected directly to the pressure booster piston chamber 31 via the battery pressure booster piston chamber connection 12, wherein a third control valve 43 is arranged in the battery pressure booster piston chamber duct connection 12.

An den Druckübersetzerstangenraum 32 ist eine Druckübersetzerstangenraum-Leitungsverbindung 13 angeschlossen, die zu einem zweiten ansteuerbaren Steuerventil 42 und einem diesem nachgeschalteten Druckregelventil 48 führt. Von dem Druckregelventil 48 führt eine Leitung zum Akku 10. Das Druckregelventil 48 weist zudem einen Anschluss zu einem Tank 80 auf, so dass das aus dem Druckübersetzerstangenraum 32 verdrängte Fluid zum Tank 80 abgeleitet werden kann.To the pressure booster rod space 32, a pressure booster rod space line connection 13 is connected, which leads to a second controllable control valve 42 and a pressure control valve 48 connected downstream of this. From the pressure control valve 48 leads a line to the battery 10. The pressure control valve 48 also has a connection to a tank 80, so that the displaced from the pressure booster chamber 32 fluid can be discharged to the tank 80.

Zum Ableiten von Hydraulikfluid aus dem Druckübersetzerkolbenraum 31 ist eine Druckübersetzerkolbenraumentlastungs-Leitungsverbindung 14 vorgesehen, in welcher ein viertes ansteuerbares Steuerventil 44 angeordnet ist und welche zu einem Tank 80 führt.For deriving hydraulic fluid from the pressure booster piston chamber 31, there is provided a pressure booster piston space load line connection 14, in which a fourth controllable control valve 44 is arranged and which leads to a tank 80.

Zum Ableiten von Hydraulikfluid aus dem Arbeitszylinderstangenraum 22 ist an diesem ein fünftes ansteuerbares Steuerventil 45 in Form eines Mehrwegeventils mit mehreren Anschlüssen a, b, c angeschlossen. Ein erster Anschluss a verbindet das fünfte Steuerventil 45 mit einem Tank 80, so dass bei einsprechender Stellung des fünften Steuerventils 45 der Druckzylinderstangenraum 22 zum Tank 80 entlastet werden kann.For deriving hydraulic fluid from the working cylinder rod space 22, a fifth controllable control valve 45 in the form of a multiway valve with a plurality of connections a, b, c is connected to this. A first port a connects the fifth control valve 45 to a tank 80, so that when more responsive Position of the fifth control valve 45 of the pressure cylinder rod space 22 to the tank 80 can be relieved.

Ein zweiter Anschluss b des fünften Steuerventils 45 ist mittels einer Leitung mit einem Multiplikator 90 als Druckübersetzer verbunden. Der Multiplikator 90 weist einen Multiplikatorkolben 94 mit einseitig angeschlagener Multiplikatorkolbenstange 93 auf, wobei der Multiplikatorkolben 94 das Innere des Multiplikators 90 in einen Multiplikatorkolbenraum 91 und einen Multiplikatorstangenraum 92 unterteilt. Von dem Multiplikatorstangenraum 92 führt eine Leitung zum Akku 10, in die ein zweites Rückschlagventil 62 mit einer zum Akku 10 hin gerichteten Durchlassrichtung eingeschaltet ist.A second connection b of the fifth control valve 45 is connected by means of a line with a multiplier 90 as a pressure booster. The multiplier 90 has a multiplier piston 94 with one-sided impacted multiplier piston rod 93, wherein the multiplier piston 94 divides the interior of the multiplier 90 into a multiplier piston chamber 91 and a multiplier rod chamber 92. Of the Multiplikatorstangenraum 92 leads a line to the battery 10, in which a second check valve 62 is turned on with a directed toward the battery 10 towards the direction of passage.

Ein weiterer Anschluss c des fünften Steuerventils 45 ist über eine Leitung mit dem Akku 10 verbunden, wobei in diese Leitung ein drittes Rückschlagventil 63 mit einer zum Akku 10 gerichteten Durchlassrichtung eingeschaltet ist.A further connection c of the fifth control valve 45 is connected via a line to the battery 10, wherein in this line a third check valve 63 is turned on with a directed towards the battery 10 passage direction.

Nach Beendigung des Arbeitszyklus muss zunächst der Arbeitszylinderkolbenraum 21 mit dem darin unter einem hohen Druck von dem Druckübersetzer 30 multiplizierten Druck anstehenden Fluid entlastet werden, und hierzu kann der Arbeitszylinderkolbenraum 21 über ein sechstes ansteuerbares Steuerventil 46 mit einem Tank 80 verbunden werden.After the end of the working cycle, the working cylinder piston chamber 21 must first be relieved of the fluid present therein at a high pressure multiplied by the pressure booster 30, and for this purpose the working cylinder piston chamber 21 can be connected to a tank 80 via a sixth controllable control valve 46.

Soweit nach Beendigung eines Arbeitszyklus der Arbeitszylinder 20, der Druckübersetzer 30 und der Multiplikator 90 in ihre Ausgangsstellung zurückzuführen sind, ist der ersten Pumpe 71 das sechste Steuerventil 46 nachgeschaltet. Die von dem sechsten Steuerventil 46 abgehenden Leitungen führen zum Arbeitszylinderkolbenraum 21 und zum Arbeitszylinderstangenraum 22. Bei entsprechender Schaltung des sechsten Steuerventils 46 kann somit bei Beaufschlagung des Arbeitszylinderstangenraumes 22 durch von der ersten Pumpe 71 gefördertes Fluid der Arbeitszylinderkolben 24 in seine Ausgangsstellung zurückgefahren werden, wobei das aus dem Arbeitszylinderkolbenraum 21 verdrängte Fluid über das sechste Steuerventil 46 zum Tank 80 abfließt. In gleicher Weise ist dem Multiplikator 90 ein entsprechendes siebtes Steuerventil 47 mit Anschluss an eine zweite Pumpe 72 und einen Tank 80 vorgesehen, wobei das siebte Steuerventil 47 mittels entsprechender Leitungen mit dem Multiplikatorkolbenraum 91 beziehungsweise dem Multiplikatorstangenraum 92 verbunden sind. Auf diese Weise ist auch hier ein Zurücksetzen des Multiplikators 90 gegeben.As far as after completion of a working cycle of the working cylinder 20, the pressure booster 30 and the multiplier 90 are due to their initial position, the first pump 71, the sixth control valve 46 is connected downstream. The outgoing from the sixth control valve 46 lines lead to the working cylinder piston chamber 21 and the working cylinder rod chamber 22. With appropriate circuit of the sixth control valve 46 can thus by applying the cylinder rod space 22 by the first Pump 71 funded fluid of the working cylinder piston 24 are returned to its original position, wherein the displaced from the working cylinder piston chamber 21 fluid via the sixth control valve 46 flows to the tank 80. Similarly, the multiplier 90 is a corresponding seventh control valve 47 is provided with connection to a second pump 72 and a tank 80, wherein the seventh control valve 47 are connected by means of corresponding lines with the Multiplikatorkolbenraum 91 and the Multiplikatorstangenraum 92. In this way, a reset of the multiplier 90 is also given here.

Nachstehend wird nun die Durchführung des Verfahrens anhand der vorstehend erläuterten Schaltungsanordnung beschrieben.Now, the implementation of the method will be described with reference to the above-described circuit arrangement.

Vor Beginn eines Arbeitszyklus wird der Akku 10 von der ersten Pumpe 71 gefüllt und aufgeladen, wobei ein Rückströmen durch das erste Rückschlagventil 61 verhindert ist. In dieser Phase befindet sich das sechste Steuerventil 46 in seiner Sperrstellung. Vor Beginn des Arbeitszyklus befinden sich zudem das erste Steuerventil 41 und das zweite Steuerventil 42 in ihrer Sperrstellung.Before starting a working cycle, the battery 10 is filled and charged by the first pump 71, wherein a return flow through the first check valve 61 is prevented. In this phase, the sixth control valve 46 is in its blocking position. Before the start of the duty cycle are also the first control valve 41 and the second control valve 42 in its blocking position.

Zur Einleitung der ersten Phase wird das erste Steuerventil 41 teilweise geöffnet, so dass aus dem Akku 10 Fluid in den Arbeitszylinderkolbenraum 21 strömen kann. Aufgrund der Regelung des Fluidstroms mittels des ersten Steuerventils 41 kann die Geschwindigkeit des Verfahrens des Arbeitszylinderkolbens 24 zum Füllen der Füllbüchse 52 geregelt werden.To initiate the first phase, the first control valve 41 is partially opened so that fluid 10 can flow into the working cylinder piston chamber 21 from the battery. Due to the regulation of the fluid flow by means of the first control valve 41, the speed of the method of the working cylinder piston 24 for filling the filling sleeve 52 can be regulated.

Ist die Füllbüchse 52 gefüllt und soll das darin enthaltene Metall nun in der zweiten Phase in den Formhohlraum 51 der Druckgussform 50 eingeschossen werden, so erfolgt ein weiteres Vorfahren des Arbeitszylinderkolbens 24 mit hoher Geschwindigkeit. Während dieser schnellen Vorwärtsfahrt des Arbeitszylinderkolbens 24 wird das fünfte Steuerventil 45 in eine Stellung gebracht, in welcher das aus dem Arbeitszylinderstangenraum 22 verdrängte Fluid dem Multiplikator 90 zugeführt wird. Aufgrund der Flächenverhältnisse am Multiplikatorkolben 94 mit Multiplikatorkolbenstange 93 findet im Multiplikatorstangenraum 92 eine Erhöhung des Druckes für das aus dem Multiplikator 90 ausgeschobene Fluid statt, welches über das zweite Rückschlagventil 62 zum Akku 10 geleitet wird, wobei der durch die Druckerhöhung erzeugte Druck dem im Akku 10 gegebenen Druck entspricht.If the filling bushing 52 is filled and if the metal contained therein is now to be injected into the mold cavity 51 of the pressure casting mold 50 in the second phase, another ancestor of the working cylinder piston 24 takes place at high speed. During this fast forward drive of the working cylinder piston 24, the fifth control valve 45 is placed in a position in which the fluid displaced from the working cylinder rod space 22 is supplied to the multiplier 90. Due to the area ratios on the multiplier piston 94 with multiplier piston rod 93, an increase in the pressure for the fluid expelled from the multiplier 90 takes place in the multiplier rod chamber 92, which is conducted via the second check valve 62 to the battery 10, wherein the pressure generated by the pressure increase in the battery 10th given pressure corresponds.

Soweit am Ende des Einschießvorgangs der zweiten Phase ein Abbremsen des Arbeitszylinderkolbens 24 erfolgt, wird während dieses kurzen Zeitraumes das erste Steuerventil 41 in eine niedrige Öffnungsstellung gebracht, so dass der Arbeitszylinderkolbenraum 21 nur noch mit einer geringen Menge Fluid beaufschlagt ist. Gleichzeitig wird das fünfte Steuerventil 45 erneut in eine Stellung verbracht (Stellung c), in der der Arbeitszylinderstangenraum 22 mit dem Akku 10 verbunden ist, so dass das aus dem Arbeitszylinderstangenraum 22 ausgeschobene Fluid in den Akku 10 rückgespeist wird. Der sich in dieser kurzen Phase aufbauende hohe Systemdruck im Arbeitszylinderstangenraum 22 sorgt dafür, dass die Kolbenbewegung verzögerungsfrei in wenigen Millisekunden auf den gewünschten Wert reduziert wird, wobei die überschüssige Energie in Form von Fluiddruck spitzenfrei in den Akku 10 rückgespeist wird.As far as at the end of Einschießvorgangs the second phase, a deceleration of the working cylinder piston 24, during this short period, the first control valve 41 is brought into a low open position, so that the working cylinder piston chamber 21 is acted upon only with a small amount of fluid. At the same time, the fifth control valve 45 is again brought into a position (position c) in which the working cylinder rod space 22 is connected to the battery 10, so that the fluid expelled from the working cylinder rod space 22 is fed back into the battery 10. The build-up in this short phase high system pressure in the working cylinder rod space 22 ensures that the piston movement is reduced delay in a few milliseconds to the desired value, the excess energy is fed back into the battery 10 tip-free in the form of fluid pressure.

Am Ende der Bremsphase des Arbeitszylinders wird das erste Steuerventil 41 vollständig geschlossen und in seine Sperrstellung verbracht, wodurch eine Rückspeisung von Hydraulikfluid aus dem Arbeitszylinderkolbenraum 21 verhindert ist. Gleichzeitig wird zur Einleitung der dritten Phase, bei geöffnetem dritten Steuerventil 43, das zweite Steuerventil 42 vollständig geöffnet, so dass der Druckübersetzerkolben 34 in Richtung des Arbeitszylinders 20 verfährt und den Druck im Arbeitszylinderkolbenraum 21 vergrößert. Das aus dem Druckübersetzerstangenraum 32 austretende Fluid wird über das zweite Steuerventil 42 und das Druckregelventil 48 zum Tank 80 abgeleitet. Soweit am Ende der dritten Phase eine Entspannung des im Arbeitszylinderkolbenraum 21 anstehenden hohen Drucks erfolgen muss, wird das Fluid über das sechste Steuerventil 46 und das erste Rückschlagventil 61 zum Akku 10 gespeist, so dass die überschüssige Energie in Form von Fluid ebenfalls durch Rückspeisung in den Akku 10 nutzbar ist.At the end of the braking phase of the working cylinder, the first control valve 41 is completely closed and spent in its blocking position, whereby a return of hydraulic fluid from the working cylinder piston chamber 21 is prevented. At the same time the second control valve 42 is fully opened to initiate the third phase, with the third control valve 43 open, so that the pressure booster piston 34 moves in the direction of the working cylinder 20 and increases the pressure in the working cylinder piston chamber 21. The fluid exiting the pressure booster rod chamber 32 is via the second Control valve 42 and the pressure control valve 48 to the tank 80 derived. As far as at the end of the third phase, a relaxation of the pending in the working cylinder piston chamber 21 high pressure must be, the fluid via the sixth control valve 46 and the first check valve 61 is fed to the battery 10, so that the excess energy in the form of fluid also by feeding back into the Battery 10 is usable.

Soweit am Ende eines Arbeitszyklus jeweils eine Rückstellung der beteiligten Zylinder zu erfolgen hat, erfolgt dies über eine entsprechende Schaltung der Steuerventile 41 bis 47. So wird das sechste Steuerventil 46 in eine Stellung verbracht, in welcher durch Einspeisung von Fluid in den Arbeitszylinderstangenraum 22 der Arbeitszylinderkolben 24 rückverfahren wird, wobei das aus dem Arbeitszylinderkolbenraum 21 verdrängte Fluid zu dem Tank 80 abgeleitet wird. Entsprechendes gilt für die Rückstellung des Multiplikators 90 mittels des diesem zugeordneten sechsten Steuerventils 46.As far as at the end of each working cycle a provision of the participating cylinders has to be made, this is done via a corresponding circuit of the control valves 41 to 47. Thus, the sixth control valve 46 is moved to a position in which by feeding fluid into the working cylinder rod space 22 of the working cylinder piston 24, the fluid displaced from the working cylinder piston space 21 is discharged to the tank 80. The same applies to the provision of the multiplier 90 by means of the associated sixth control valve 46th

Zur Rückstellung des Druckübersetzerkolbens 34 wird das dritte Steuerventil 43 geschlossen, so dass der Druckübersetzerstangenraum 32 über das Druckregelventil 48 und das zweite Steuerventil 42, welches während des Rückfahrens geöffnet ist, mit dem Akku 10 verbunden ist. Gleichzeitig wird das vierte Steuerventil 44 geöffnet, so dass das aus dem Druckübersetzerkolbenraum 31 verdrängte Fluid in den Tank 80 verdrängt werden kann.To reset the pressure booster piston 34, the third control valve 43 is closed, so that the pressure booster chamber 32 is connected to the battery 10 via the pressure control valve 48 and the second control valve 42, which is open during the return travel. At the same time, the fourth control valve 44 is opened, so that the displaced from the pressure booster piston chamber 31 fluid can be displaced into the tank 80.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Akkubattery pack
1111
Akku-Arbeitszylinderkolbenraum-LeitungsverbindungBattery power cylinder piston chamber-line connection
1212
Akku-Druckübersetzerkolbenraum-LeitungsverbindungBattery-pressure intensifier piston chamber-line connection
1313
Druckübersetzerstangenraum-LeitungsverbindungIntensifier bar room-line connection
1414
Druckübersetzerkolbenraumentlastungs-LeitungsverbindungIntensifier piston chamber relief line connection
2020
Arbeitszylinderworking cylinder
2121
ArbeitszylinderkolbenraumCylinder piston chamber
2222
ArbeitszylinderstangenraumCylinder rod chamber
2323
ArbeitszylinderkolbenstangeWorking cylinder piston rod
2424
ArbeitszylinderkolbenCylinder piston
3030
DruckübersetzerPressure intensifier
3131
DruckübersetzerkolbenraumIntensifier piston chamber
3232
DruckübersetzerstangenraumIntensifier rod space
3333
DruckübersetzerkolbenstangeIntensifier piston rod
3434
DruckübersetzerkolbenPressure booster piston
4141
erstes ansteuerbares Steuerventilfirst controllable control valve
4242
zweites ansteuerbares Steuerventilsecond controllable control valve
4343
drittes ansteuerbares Steuerventilthird controllable control valve
4444
viertes ansteuerbares Steuerventilfourth controllable control valve
4545
fünftes ansteuerbares Steuerventilfifth controllable control valve
4646
sechstes ansteuerbares Steuerventilsixth controllable control valve
4747
siebtes ansteuerbares Steuerventilseventh controllable control valve
4848
DruckregelventilPressure control valve
5050
Druckgießformdie
5151
Formhohlraummold cavity
5252
Füllbüchseshot sleeve
6161
erstes Rückschlagventilfirst check valve
6262
zweites Rückschlagventilsecond check valve
6363
drittes Rückschlagventilthird check valve
7171
erste Pumpefirst pump
7272
zweite Pumpesecond pump
8080
Tanktank
9090
Multiplikatormultiplier
9191
MultiplikatorkolbenraumMultiplier piston chamber
9292
MultiplikatorstangenraumMultiplier rod space
9393
MultiplikatorkolbenstangeMultiplier piston rod
9494
Multiplikatorkolbenmultiplier piston

Claims (9)

Hydraulische Schaltungsanordnung für eine Kaltkammerdruckgussmaschine zur Herstellung von Metallbauteilen, - mit einem Akku (10) zur Bereitstellung eines Hydraulikfluides, - mit einem einen Arbeitszylinderkolbenraum (21) aufweisenden Arbeitszylinder (20), - mit einer ein erstes ansteuerbares Steuerventil (41) aufweisenden Leitungsverbindung, über die der Akku (10) mit dem Arbeitszylinderkolbenraum (21) verbindbar ist, - mit einem einen Druckübersetzerkolbenraum (31) und einen Druckübersetzerstangenraum (32) aufweisenden Druckübersetzer (30) zur Druckerhöhung in dem Arbeitszylinderkolbenraum (21), und - mit einer Leitungsverbindung, über die der Akku (10) mit dem Druckübersetzerkolbenraum (31) verbindbar oder verbunden ist, dadurch gekennzeichnet, dass - das erste Steuerventil (41) eine Sperrstellung und eine Durchlassstellung aufweist, dass - in der Leitungsverbindung (11) zwischen dem Akku (10) und dem Arbeitszylinderkolbenraum (21) hinter dem ersten Steuerventil (41) keine Einbauten zum Verschließen der Leitungsverbindung (11) vorhanden sind, wobei eine Rückspeisung des Fluides aus dem Arbeitszylinderkolbenraum (21) heraus durch Sperren des ersten Steuerventils (41) unterbindbar ist, und dass - der Akku (10) mittels einer zu dem ersten Steuerventil (41) parallelen Leitungsverbindung (12) mit dem Druckübersetzerkolbenraum (31) verbunden oder verbindbar ist, über die der Druckübersetzerkolbenraum (31) während der Druckerhöhung beaufschlagbar ist. Hydraulic circuit arrangement for a cold chamber die casting machine for the production of metal components, - With a battery (10) for providing a hydraulic fluid, with a working cylinder piston space (21) having a working cylinder (20), - With a first controllable control valve (41) having line connection, via which the battery (10) with the working cylinder piston chamber (21) is connectable, - With a one Druckübersetzerkolbenraum (31) and a Druckübersetzerstangenraum (32) having pressure intensifier (30) for increasing the pressure in the working cylinder piston chamber (21), and - With a line connection, via which the battery (10) with the pressure booster piston chamber (31) is connectable or connected, characterized in that - The first control valve (41) has a blocking position and a passage position that - In the line connection (11) between the battery (10) and the working cylinder piston chamber (21) behind the first control valve (41) no internals for closing the line connection (11) are present, with a return feed of the fluid from the working cylinder piston chamber (21) out is inhibitable by locking the first control valve (41), and that - The battery (10) by means of a to the first control valve (41) parallel line connection (12) with the pressure booster piston chamber (31) is connected or connectable, via which the pressure booster piston chamber (31) can be acted upon during the pressure increase. Hydraulische Schaltungsanordnung nach Anspruch 1, wobei in einer an den Druckübersetzerstangenraum (32) angeschlossenen Leitungsverbindung (13) ein zweites ansteuerbares Steuerventil (42) angeordnet ist, welches eine Sperrstellung und ein Durchlassstellung aufweist.Hydraulic circuit arrangement according to claim 1, wherein in a to the pressure booster rod space (32) connected line connection (13), a second controllable control valve (42) is arranged, which has a blocking position and a passage position. Hydraulische Schaltungsanordnung nach Anspruch 1 oder 2, wobei zur Druckerhöhung in dem Arbeitszylinderkolbenraum (21) durch den Druckübersetzer (30) ein in einer an den Druckübersetzerstangenraum (32) angeschlossenen Leitungsverbindung (13) angeordnetes zweites ansteuerbares Steuerventil (42) zu betätigen ist.Hydraulic circuit arrangement according to claim 1 or 2, wherein for pressure increase in the working cylinder piston chamber (21) by the pressure booster (30) in a to the pressure booster chamber (32) connected line connection (13) arranged second controllable control valve (42) is to be actuated. Hydraulische Schaltungsanordnung nach einem der vorhergehenden Ansprüche, wobei das erste Steuerventil (41) und ein in einer an den Druckübersetzerstangenraum (32) angeschlossenen Leitungsverbindung (13) angeordnetes zweites ansteuerbares Steuerventil (42) so eingerichtet sind, dass während einer Druckerhöhung im Arbeitszylinderkolbenraum (21) durch den Druckübersetzer (30) das erste Steuerventil (41) seine Leitungsverbindung (11) vollständig sperrt und das zweite Steuerventil (42) seine Leitungsverbindung (13) zumindest teilweise durchlässig schaltet.Hydraulic circuit arrangement according to one of the preceding claims, wherein the first control valve (41) and a second controllable control valve (42) arranged in a line connection (13) connected to the pressure booster chamber (32) are arranged such that during a pressure increase in the working cylinder piston chamber (21). by the pressure booster (30) the first control valve (41) completely blocks its line connection (11) and the second control valve (42) switches its line connection (13) at least partially permeable. Hydraulische Schaltungsanordnung nach einem der vorhergehenden Ansprüche, wobei in der Leitungsverbindung (12) vom Akku (10) zum Druckübersetzerkolbenraum (31) ein drittes Steuerventil (43) angeordnet ist und in einer von dem Druckübersetzerkolbenraum (31) zu einem Tank (80) führenden Leitungsverbindung (14) ein viertes Steuerventil (44) angeordnet ist.Hydraulic circuit arrangement according to one of the preceding claims, wherein in the line connection (12) from the battery (10) to the pressure booster piston chamber (31), a third control valve (43) is arranged and in one of the pressure booster piston chamber (31) leading to a tank (80) line connection (14) a fourth control valve (44) is arranged. Verfahren zum Betreiben einer Kaltkammerdruckgussmaschine, - bei welchem in einer ersten Phase das Befüllen einer einem Formhohlraum (51) vorgeschalteten Füllbüchse (52) mit flüssigem Metall mittels einer langsamen Vorschubbewegung einer Arbeitszylinderkolbenstange (23) eines Arbeitszylinders (20) erfolgt, - bei welchem in einer zweiten Phase das flüssige Metall mittels einer schnellen Vorschubbewegung der Arbeitszylinderkolbenstange (23) in den Formhohlraum (51) eingeschossen wird, und - bei welchem in einer dritten Phase der Druck auf die Arbeitszylinderkolbenstange (23) mittels eines Druckübersetzers (30) während des Auskühlens des eingeschossenen Metalls erhöht ist, wobei die Versorgung eines Arbeitszylinderkolbenraums (21) des Arbeitszylinders (20) durch ein erstes Steuerventil (41) hindurch mit einem Hydraulikfluid mittels eines Akkus (10) erfolgt und auch die Versorgung eines Druckübersetzerkolbenraums (31) des Druckübersetzers (30) mit dem Hydraulikfluid mittels des Akkus (10) erfolgt, dadurch gekennzeichnet, dass - das Fluid in der ersten und zweiten Phase von dem Akku (10) zu dem Arbeitszylinderkolbenraum (21) durch das erste Steuerventil (41) hindurch und danach durch keine weiteren Einbauten zum Schließen der entsprechenden Leitungsverbindung (11) gespeist wird, wobei - in der dritten Phase eine Rückspeisung aus dem Arbeitszylinderkolbenraum (21) durch Sperren des ersten Steuerventils (41) unterbunden wird, und dass - der Druckübersetzerkolbenraum (31) in der dritten Phase durch eine zu dem ersten Steuerventil (41) parallele Leitungsverbindung (12) von dem Akku (10) beaufschlagt wird. Method for operating a cold chamber die casting machine, in which in a first phase the filling of a filling cavity (51) upstream of a stuffing box (52) with liquid metal takes place by means of a slow advancing movement of a working cylinder piston rod (23) of a working cylinder (20), - In which in a second phase, the liquid metal is injected by means of a rapid feed movement of the working cylinder piston rod (23) in the mold cavity (51), and - In which in a third phase, the pressure on the working cylinder piston rod (23) by means of a pressure booster (30) during the cooling of the injected metal is increased, wherein the supply of a working cylinder piston chamber (21) of the working cylinder (20) through a first control valve (41) with a hydraulic fluid by means of a battery (10) and also supplying a Druckübersetzerkolbenraums (31) of the pressure booster (30) with the hydraulic fluid by means of the battery (10), characterized in that - The fluid in the first and second phases of the accumulator (10) to the working cylinder piston chamber (21) through the first control valve (41) and thereafter fed by no further internals for closing the corresponding line connection (11) - In the third phase, a recovery from the working cylinder piston chamber (21) by blocking the first control valve (41) is prevented, and that - The pressure booster piston chamber (31) in the third phase by a to the first control valve (41) parallel line connection (12) is acted upon by the battery (10). Verfahren nach Anspruch 6, wobei in der dritten Phase ein mit einem Druckübersetzerstangenkolbenraum (32) des Druckübersetzers (30) gekoppeltes zweites Steuerventil (42) zumindest teilweise durchlässig geschaltet wird.A method according to claim 6, wherein in the third phase, a second control valve (42) coupled to a pressure booster piston space (32) of the pressure booster (30) is at least partially permeable. Verfahren nach Anspruch 7, wobei das erste Steuerventil (41) und das zweite Steuerventil (42) synchron geschaltet werden.The method of claim 7, wherein the first control valve (41) and the second control valve (42) are synchronized. Verfahren nach einem der Ansprüche 6 bis 8, wobei beim Rückführen des Druckübersetzerkolbens (34) ein in der vom Akku (10) zum Druckübersetzerkolbenraum (31) führenden Leitung (12) angeordnetes drittes Steuerventil (43) geschlossen ist und ein in einer von dem Druckübersetzerkolbenraum (31) zu einem Tank (80) führenden Leitungsverbindung (14) angeordnetes viertes Steuerventil (44) geöffnet ist.Method according to one of Claims 6 to 8, a third control valve (43) arranged in the line (12) leading from the rechargeable battery (10) to the pressure booster piston space (31) being closed during the return of the pressure booster piston (34) and in one of the pressure booster piston chamber (31) to a tank (80) leading line connection (14) arranged fourth control valve (44) is opened.
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EP0576795A1 (en) * 1992-06-05 1994-01-05 Maschinenfabrik Müller-Weingarten AG Method and apparatus to controle the process of a die casting machine
EP2365888B1 (en) 2008-12-17 2013-03-06 Bühler Druckguss Ag Pressure booster and diecasting arrangement
JP2010264468A (en) * 2009-05-13 2010-11-25 Toshiba Mach Co Ltd Molding machine and controller of the same
EP2295171A1 (en) 2009-09-15 2011-03-16 Richard Oberle Method and hydraulic switching assembly for operating a metal pressure casting assembly
EP2295171B1 (en) 2009-09-15 2012-10-24 Richard Oberle Method and hydraulic switching assembly for operating a metal pressure casting assembly
DE102015202273A1 (en) * 2015-02-09 2016-08-11 Oskar Frech Gmbh + Co. Kg Pressure translator device and die casting machine
US20160279701A1 (en) * 2015-03-27 2016-09-29 Toshiba Kikai Kabushiki Kaisha Injection device and molding apparatus

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EP3421155B1 (en) 2019-06-19
CN109139573B (en) 2021-06-08
CN109139573A (en) 2019-01-04

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