US20040033141A1 - Method and drive system for the control/regulation of linear pressure/cast movement - Google Patents

Method and drive system for the control/regulation of linear pressure/cast movement Download PDF

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Publication number
US20040033141A1
US20040033141A1 US10/332,625 US33262503A US2004033141A1 US 20040033141 A1 US20040033141 A1 US 20040033141A1 US 33262503 A US33262503 A US 33262503A US 2004033141 A1 US2004033141 A1 US 2004033141A1
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Prior art keywords
pump
piston
throttle
casting
drive system
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Abandoned
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US10/332,625
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English (en)
Inventor
Bruno Stillhard
Ronald Siegrist
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ProControl AG
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ProControl AG
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Publication of US20040033141A1 publication Critical patent/US20040033141A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/82—Hydraulic or pneumatic circuits
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/163—Control arrangements for fluid-driven presses for accumulator-driven presses
    • 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
    • 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
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/044—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out"
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1476—Special return means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/82—Hydraulic or pneumatic circuits
    • B29C2045/824—Accumulators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/76013—Force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/76083—Position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/7611—Velocity
    • B29C2945/76113—Velocity linear movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76177—Location of measurement
    • B29C2945/7618—Injection unit
    • B29C2945/762—Injection unit injection piston
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76344—Phase or stage of measurement
    • B29C2945/76381—Injection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76498—Pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76595—Velocity
    • B29C2945/76598—Velocity linear movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76655—Location of control
    • B29C2945/76658—Injection unit
    • B29C2945/76678—Injection unit injection piston
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76655—Location of control
    • B29C2945/76775—Fluids
    • B29C2945/76785—Fluids hydraulic fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76822—Phase or stage of control
    • B29C2945/76859—Injection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76822—Phase or stage of control
    • B29C2945/76862—Holding, dwelling
    • 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
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • 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
    • 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • 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
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3144—Directional control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
    • 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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/40—Flow control
    • F15B2211/455—Control of flow in the feed line, i.e. meter-in control
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to the return line
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a directional control valve
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7052—Single-acting output members
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/76—Control of force or torque of the output member

Definitions

  • This invention relates to a method and a drive system for controlling/regulating the linear pressing/casting movement by means of a driving piston in injection molding machines and die-casting machines or presses, whereby a hydraulic medium is used at least on the drive side and/or the piston rod side.
  • the compression axle or die-casting axle is essentially the heart of the die-casting machine or press. This is also true of cold or hot chamber magnesium die-casting machines. High injection forces and practical working casting rates of more than 3 m/sec to 5 m/sec are required. In the area of injection molding machines for use with plastics, machines that operate only with an electric drive have already become well established to a great extent, in addition to traditional machines driven by oil hydraulic systems. In cold and hot chamber magnesium die-casting machines, all the axles except the casting axle can be driven by electric motor. The casting rate here is even higher.
  • U.S. Pat. No. 4,022,269 discloses schematically a drive system for a die-casting machine, where the back side of the piston is acted upon by a compressed gas from two pressurized containers.
  • the compressed gas acts through appropriate throttles and controlled/regulated valves.
  • the compressed gas acts on the back side of the driving piston.
  • a hydraulic fluid is used on the front side.
  • pressure is generated by a pump, and on the other hand, it is released through a valve.
  • a non-return valve is situated between the pump and the forward piston space and/or the space on the side of the piston rod.
  • the reverse movement of the driving piston is accomplished directly by way of the hydraulic pump.
  • compressed gas is used on the back side of the piston.
  • the oil to be displaced on the piston rod side is discharged only through the valve because it is blocked by the non-return valve without a reverse flow through the pump.
  • An entire die-casting machine consists of a mold closing unit 2 and a casting unit 3 (FIG. 1).
  • the drive system 4 for a movable mold 5 which is attached to a mounting plate 7 by columns 6 in a non-positive manner, is situated on the side of the mold closing unit 2 .
  • the casting piston rod 8 is moved by a casting drive 10 , and in the example illustrated here, an accumulator 9 is equipped with an extra pre-accumulator 11 .
  • the machine sits on a machine base 12 .
  • FIGS. 2 and 2 a show the casting unit 3 of a cold chamber machine with casting drive 10 , shown schematically on an enlarged scale with the casting equipment (left), having the following essential components.
  • Accumulator 9 is connected by a shot valve 13 to the back side 14 of the driving piston 15 to generate the required pressure for the three phases (FIG. 7): the forward pressure, the mold filling and the mold filling pressure.
  • the casting driving cylinder 16 the casting piston rod 8 is fixedly connected to the driving piston 15 on the piston rod end. On its other end, the casting piston rod 8 has a casting piston 17 and it projects into a casting chamber 18 into which molten metal 20 is fed through a filling port.
  • the molten metal 20 is pressed by the forward movement according to arrow 21 through a cutout 22 into the mold cavity 23 of the two die-casting molds 24 and 25 .
  • the individual control functions are initiated by way of control means (not shown), especially for the shot valve 13 , a hydraulic pump 30 and a control valve 31 .
  • Oil at the desired pressure is supplied through the control valve 31 by way of a line 32 for the return movement of the casting piston 17 .
  • oil displaced by the movement of the driving piston 15 is drained into a tank 33 on the piston rod side, like the reflux of a pressure-limiting valve 34 .
  • FIG. 2 illustrates schematically how the casting drive is controlled/regulated with a continuous valve with the possibility of real-time digital control.
  • FIG. 3 shows a known example of a path-time diagram at a constant forward speed and at a constantly accelerated forward speed.
  • the forward flow and of mold filling phases are clearly discernible.
  • the constant forward speed can be seen as a straight line and the constantly accelerated forward speed is shown as a parabola.
  • FIGS. 4 and 5 show a more complicated casting drive with two piston-type accumulators 40 , 41 and a multiplier 42 .
  • the pressure medium is always a hydraulic fluid 43 .
  • FIG. 6 shows schematically an example of a hot-chamber casting drive.
  • three phases may be differentiated in the casting cycle.
  • the hydraulic medium is conveyed by the pump through a forward valve 44 and a return valve 45 to the back side 14 of the driving piston 15 .
  • the piston-type accumulator I and/or 41 is switched on by a speed control valve 46 and a shot valve 47 .
  • the mold filling pressure, the piston-type accumulator II and/or 40 is activated by a control valve 48 and a multiplier valve and multiplier 42 .
  • the hydraulic pressure can be increased from 55 bar to 140 bar and/or to 210 bar by the three-stage operation according to this example.
  • FIG. 12 shows a typical example of a press.
  • the speed of the plunger is limited like the speed of the casting piston.
  • This invention is based on the object of finding a simple design for the drive for the pressing and/or casting axle, which will allow optimum control of the casting piston movement and an increase in the pressing/casting piston speed in comparison with the state of the art.
  • the method according to this invention is characterized in that the pressing/casting movement is controllable/regulatable with respect to the oil flow and/or oil pressure on the side of the piston rod by way of a pump and, at least in some phases, additionally by way of a throttle valve ( 34 , 46 ) which operates in parallel with the pump.
  • the device according to this invention is characterized in that both a pump and also at least one parallel-connected throttle are arranged on the side of the piston rod such that at least for the area of rapid forward movement, both the flow through the pump and the flow through the throttle can be controlled/regulated at the same time by motor means.
  • This novel invention has four very important advantages: with the simultaneous use of the pump and throttle for the return flow, it is possible to increase the speed of the pressing/casting movement with a relatively small increased complexity in terms of the design.
  • the pump may thus be designed to be as small as possible and the throttle may be designed to be as large as necessary. This yields a relatively advantageous structural complexity.
  • the throttle discharge, as a path subject to a very high loss, is used extremely briefly, and throttle losses are therefore minimized.
  • European Patent 0 782 671 The pump may be used for energy recovery by way of the drive motor in the return flow because the motor and the pump can function as a generator.
  • the pump may be used as a motor, and the energy obtainable via the server motor may be used for other axles and/or a portion may be stored in DC capacitors.
  • the entire system may be used entirely or partially in the sense of an oscillator due to the fact that the largest possible energy component is only shifted back and forth in the system and is not destroyed.
  • This novel invention makes it possible to utilize the acknowledged advantages of an electric drive essentially on larger machines with a closing force of more than 200 metric tons through a novel combination of servo motor and hydraulic system. All previous considerations regarding better control of the pressing or casting axle are concentrated largely on the back side of the piston and not on the rod side of the piston, with the goal of having even higher pressures act on the piston even more rapidly.
  • This novel invention does not preclude the corresponding additional expenditures in terms of construction and control technology but it does make it possible to prevent them in many cases, and it solves the problem on the other side of the pressing or casting side and/or the piston rod side.
  • a more rapid discharge of hydraulic oil on the piston rod side which is also more demanding from the standpoint of control technology, is ensured, particularly in the phase of the greatest piston speed required. In the phase that is usually critical, this results in two oil flows, which are controlled at the highest level of the control/regulating technology. This makes it possible to select relatively small units for the individual components because they support one another mutually.
  • the surprising advantage e.g., with respect to a largely dissipation-free design or a design without control valves, is that a small energy loss due to a valve subject to dissipation must be accepted during less than ⁇ fraction (1/10) ⁇ th of a second per casting cycle under some circumstances.
  • the drive motor may be used as a motor for the pump or as a generator (for the remaining period of time), as proposed in International Patent WO97/05387 and in European Patent 0 782 671, for example.
  • An especially advantageous embodiment is characterized in that the piston is driven for the forward movement either directly or indirectly by a gas, in particular nitrogen (N 2 ) from a pressurized nitrogen tank through appropriate valves.
  • the pump is designed as a fixed-volume pump, and the control/regulation of both the pump and the throttle valve is accomplished by way of a servo motor for each case.
  • Both the pump and the throttle return flow are connected as a closed system to a closed and more or less pressureless oil container in the form of a pressure reservoir, corresponding to accumulator 9 .
  • a vacuum degassed oil is preferably used here.
  • This novel invention offers the special advantage that it is possible to work with an extremely small amount of hydraulic fluid, e.g., on the order of 10 to 20 liters, whereas 100 to 200 liters are easily present in the system with the known designs. Another advantage is the extreme reduction in the risk of fire, thanks to the extremely small amount of hydraulic fluid.
  • a similarly advantageous embodiment of the device is characterized in that an essentially known piston-type accumulator is connected upstream from the driving piston on the back side (for the forward movement).
  • a gas supply is accomplished here by way of a rapidly switching valve and a direct connection to a pressurized nitrogen container to the piston-type accumulator.
  • the pump be designed as a fixed-volume pump with a servo motor drive.
  • the throttle also has a positioning motor drive, in particular a controlled/regulated servo motor, where the overdrive may be accomplished by way of a transmission, a spindle or a crank drive.
  • the positioning drive has a spindle overdrive with a spindle nut, where the spindle nut is incorporated into the servo valve, and the servo motor, the spindle and the throttle form a compact structural unit.
  • the throttle is designed as a piston valve, where the throttle cross-section is adjustable directly by the servo motor and the spindle overdrive by means of a linear displacement.
  • the drive system also has pressure gauges for measuring the injection force and a distance measuring system for the position of the pressing/casting piston as well as a control/regulating unit designed as a multi-variable control that detects in particular the position and/or speed and/or force of the driving piston.
  • FIG. 7 this novel invention in a purely schematic diagram
  • FIG. 8 a somewhat more concrete embodiment of FIG. 7;
  • FIG. 9 the novel throttle valve, adjustable by motor
  • FIG. 10 a pictorial/schematic diagram of a multi-variable control system
  • FIG. 11 the profiles for various parameters of a casting operation
  • FIG. 12 a press in which this novel invention is used for the movement of the press ram.
  • FIGS. 7 and 8 It can be seen in FIGS. 7 and 8 that the structural embodiment of the casting equipment is unchanged in comparison with the known designs.
  • the elements for control of the oil flow on the piston rod side are designed according to a completely novel concept.
  • a liquid medium i.e., a hydraulic oil
  • the oil flow passes through line 108 and is conveyed directly through a pump 30 and line 113 .
  • the oil flow may go in one direction or the other as needed.
  • servo motor 105 is driven by a servo motor 105 and has the properties described in European Patent 782 671 and WO97/05387, for example.
  • servo motors are characterized in particular by an electronic power unit 116 by which all the important parameters can be controlled virtually simultaneously via an on-site electronic unit 117 and a higher-level controller 118 .
  • Pressure sensors (V/P), position sensors 119 and/or force sensors 120 may be connected to the on-site electronic unit by appropriate signal lines, in particular with the option of multi-variable control as described, for example, in WO94/22655 for a purely electric drive.
  • a second line 112 branches off from line 108 .
  • Line 112 is connected to a throttle 103 . Accordingly, the oil flow passes through line 112 only in the outflow direction to tank 110 , as indicated by a single arrow 121 .
  • Throttle 103 is also motor-driven by a servo motor 104 , so that the above-mentioned control and regulating technology is used accordingly.
  • the output of the throttle 103 leads back into tank 110 via a drain line 122 .
  • the oil flow into chamber 109 is produced by pump 30 , but the outflow may be accomplished either only by the pump, or for the high-speed phases of the casting piston, it may be accomplished by both means, i.e., by pump 30 as well as throttle 103 .
  • a gas, especially nitrogen gas (N 2 ) is proposed, this gas being stored in an accumulator 100 .
  • the back side of the piston may also be acted upon by oil, in which case a piston-type accumulator is situated between the back side of the piston and the gas pressure reservoir.
  • FIG. 9 shows an example of the structural embodiment of the throttle 103 with a servo motor 103 directly flange-connected to it.
  • the main part of throttle 103 is a longitudinally displaceable control piston 130 which opens or closes, blocking the flow between line 112 and the outflow line 122 , depending on the position of the connecting chamber. The flow is blocked in the position shown here. If the control piston 130 moves to the left, a more or less large throttle gap is established between the pressure side and/or the inflow chamber 122 and the connecting chamber 131 . The exact adjustment of the throttle gap is made by a ball spindle 133 , which is mounted in a nut 134 in the control piston 130 .
  • the spindle is connected directly by a coupling 138 or an intermediate gear to the shaft of servo motor 104 .
  • FIG. 10 shows a preferred control and regulating technology in the sense of a multi-axial drive with three servo motors M 1 , M 2 , M 3 that are controllable and regulatable independently and, if necessary, chronologically.
  • S 1 , S 2 and S 3 denote control signal lines and R 1 , R 2 , R 3 denote position acknowledgment lines for each axle.
  • FIG. 11 shows various injection profiles for position, speed and force.
  • the enormous increase in speed in the range from 450 to 500 ms is noteworthy.
  • the throttle operates only for 20 to 30 ms.
  • the pump may be relatively small. It is thus possible to save on the order of 2 ⁇ 3 to 3 ⁇ 4 of the energy consumption in comparison with the state of the art. This yields a practical injection rate at a relatively slow forward flow of 0.5 to 1.0 m/sec with the pump alone and with rapid injection or with a rapid shot of 5 to 10 m/sec with both the pump and throttle valve.
  • FIG. 12 illustrates the application of this novel invention with a press.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Control Of Presses (AREA)
US10/332,625 2000-04-20 2001-04-19 Method and drive system for the control/regulation of linear pressure/cast movement Abandoned US20040033141A1 (en)

Applications Claiming Priority (3)

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CH7932000 2000-04-20
CH793/00 2000-04-20
PCT/CH2001/000249 WO2001081027A1 (de) 2000-04-20 2001-04-19 Verfahren sowie antriebssystem für die steuerung/regelung der linearen press-/giessbewegung

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EP (1) EP1274526B1 (cs)
CN (1) CN1286600C (cs)
AT (1) ATE260726T1 (cs)
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CZ (1) CZ20023744A3 (cs)
DE (1) DE50101613D1 (cs)
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US20040094048A1 (en) * 2002-11-15 2004-05-20 Kubota Iron Works Co. Ltd. Double action oil hydraulic press
WO2006016162A1 (en) * 2004-08-13 2006-02-16 Tentec Limited A bolt tensioner
US20060104265A1 (en) * 2004-11-12 2006-05-18 Block Timothy R Configuring shared devices over a fabric
US20060117227A1 (en) * 2004-11-12 2006-06-01 Yu-Cheng Hsu Method, system, and program for handling a fabric device failure
EP1836366A4 (en) * 2005-05-09 2011-03-09 Mp System Co Ltd DEVICE FOR TRANSPORTING A MOTOR VEHICLE IN A PARKING SYSTEM
CN102654147A (zh) * 2012-04-26 2012-09-05 太仓市弧螺机电有限公司 一种管路压力自动调节装置
JP2014210282A (ja) * 2013-04-19 2014-11-13 東芝機械株式会社 射出装置、成形装置及び成形品の製造方法
JP2015513050A (ja) * 2012-02-13 2015-04-30 ハスキー インジェクション モールディング システムズ リミテッドＨｕｓｋｙ Ｉｎｊｅｃｔｉｏｎ Ｍｏｌｄｉｎｇ Ｓｙｓｔｅｍｓ Ｌｉｍｉｔｅｄ より高流量を必要とする、アキュムレータアセンブリおよびポンプアセンブリからアクチュエータへの油圧流体の流れ
JP2016128174A (ja) * 2015-01-09 2016-07-14 東芝機械株式会社 射出装置、成形装置及び成形方法
JP6215495B1 (ja) * 2017-02-13 2017-10-18 太平洋工業株式会社 ダイカストマシンの制御装置、制御プログラム、及び、ダイカスト製品の製造方法
CN110056548A (zh) * 2019-03-18 2019-07-26 宝鸡石油机械有限责任公司 一种压裂管汇快速连接装置液压控制系统
US10894287B2 (en) * 2017-10-30 2021-01-19 Italpresse Industrie S.P.A Die-casting machine with a system for auto-tuning of injection valves

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Cited By (18)

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Publication number Priority date Publication date Assignee Title
US20040094048A1 (en) * 2002-11-15 2004-05-20 Kubota Iron Works Co. Ltd. Double action oil hydraulic press
US6941783B2 (en) 2002-11-15 2005-09-13 Kubota Iron Works Co., Ltd. Double action oil hydraulic press
WO2006016162A1 (en) * 2004-08-13 2006-02-16 Tentec Limited A bolt tensioner
US7774656B2 (en) 2004-11-12 2010-08-10 International Business Machines Corporation System and article of manufacture for handling a fabric failure
US7487403B2 (en) 2004-11-12 2009-02-03 International Business Machines Corporation Method for handling a device failure
US20090119547A1 (en) * 2004-11-12 2009-05-07 International Business Machines Corporation System and article of manufacture for handling a fabric failure
US7676558B2 (en) 2004-11-12 2010-03-09 International Business Machines Corporation Configuring shared devices over a fabric
US20060104265A1 (en) * 2004-11-12 2006-05-18 Block Timothy R Configuring shared devices over a fabric
US20060117227A1 (en) * 2004-11-12 2006-06-01 Yu-Cheng Hsu Method, system, and program for handling a fabric device failure
EP1836366A4 (en) * 2005-05-09 2011-03-09 Mp System Co Ltd DEVICE FOR TRANSPORTING A MOTOR VEHICLE IN A PARKING SYSTEM
JP2015513050A (ja) * 2012-02-13 2015-04-30 ハスキー インジェクション モールディング システムズ リミテッドＨｕｓｋｙ Ｉｎｊｅｃｔｉｏｎ Ｍｏｌｄｉｎｇ Ｓｙｓｔｅｍｓ Ｌｉｍｉｔｅｄ より高流量を必要とする、アキュムレータアセンブリおよびポンプアセンブリからアクチュエータへの油圧流体の流れ
CN102654147A (zh) * 2012-04-26 2012-09-05 太仓市弧螺机电有限公司 一种管路压力自动调节装置
JP2014210282A (ja) * 2013-04-19 2014-11-13 東芝機械株式会社 射出装置、成形装置及び成形品の製造方法
JP2016128174A (ja) * 2015-01-09 2016-07-14 東芝機械株式会社 射出装置、成形装置及び成形方法
US10022902B2 (en) 2015-01-09 2018-07-17 Toshiba Kikai Kabushiki Kaisha Injection apparatus molding apparatus, and molding method
JP6215495B1 (ja) * 2017-02-13 2017-10-18 太平洋工業株式会社 ダイカストマシンの制御装置、制御プログラム、及び、ダイカスト製品の製造方法
US10894287B2 (en) * 2017-10-30 2021-01-19 Italpresse Industrie S.P.A Die-casting machine with a system for auto-tuning of injection valves
CN110056548A (zh) * 2019-03-18 2019-07-26 宝鸡石油机械有限责任公司 一种压裂管汇快速连接装置液压控制系统

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CN1286600C (zh) 2006-11-29
AU4629001A (en) 2001-11-07
EP1274526A1 (de) 2003-01-15
WO2001081027A1 (de) 2001-11-01
CN1436108A (zh) 2003-08-13
EP1274526B1 (de) 2004-03-03
ATE260726T1 (de) 2004-03-15
CZ20023744A3 (cs) 2003-06-18
DE50101613D1 (de) 2004-04-08

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