EP0576795A1 - Procédé et dispositif pour commande de processus pour une machine à mouler sous pression - Google Patents

Procédé et dispositif pour commande de processus pour une machine à mouler sous pression Download PDF

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Publication number
EP0576795A1
EP0576795A1 EP93106696A EP93106696A EP0576795A1 EP 0576795 A1 EP0576795 A1 EP 0576795A1 EP 93106696 A EP93106696 A EP 93106696A EP 93106696 A EP93106696 A EP 93106696A EP 0576795 A1 EP0576795 A1 EP 0576795A1
Authority
EP
European Patent Office
Prior art keywords
piston
multiplier
casting
pressure
servo
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
EP93106696A
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German (de)
English (en)
Other versions
EP0576795B1 (fr
EP0576795B2 (fr
Inventor
Friedrich Dr.-Ing. Stummer
Rolf Ing. Frey (Grad.)
Albert Ing. Reinhardt (Fh)
Wolfgang Dipl.-Ing. Lutz
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.)
Mueller Weingarten AG
Original Assignee
Maschinenfabrik Mueller Weingarten AG
Mueller Weingarten AG
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Filing date
Publication date
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Application filed by Maschinenfabrik Mueller Weingarten AG, Mueller Weingarten AG filed Critical Maschinenfabrik Mueller Weingarten AG
Publication of EP0576795A1 publication Critical patent/EP0576795A1/fr
Publication of EP0576795B1 publication Critical patent/EP0576795B1/fr
Application granted granted Critical
Publication of EP0576795B2 publication Critical patent/EP0576795B2/fr
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/32—Controlling equipment

Definitions

  • the invention relates to a method and a device for carrying out the method for process control of a die casting machine according to the preamble of claim 1.
  • a device for adjusting the ram speeds and pressures in die casting machines which operates according to the so-called three-phase system in cold chamber die casting machines.
  • This operating mode is used to set the different plunger speeds and pressures required for die casting, with only the plunger of the press cylinder acting on the plunger being acted upon via pressure medium lines in the first and second working phases, and a multiplier piston designed as a stepped piston being acted upon during the third working phase.
  • the plunger is in the first and second working phase via a bore with a check valve in the multiplier piston with pressure medium acted upon. Due to the increasing pressure in the cylinder space of the press cylinder, the bore in the multiplier piston closes, so that during the third phase (holding pressure phase) the multiplier piston, with its piston surface ratio, acts on the press piston and thus on the casting piston.
  • a three-phase system is understood to mean the course of the casting process, particularly in the case of a horizontal cold chamber die casting machine, with a pre-filling phase of the casting chamber (first phase), a mold filling phase of the casting mold (second phase) and a holding pressure phase of the casting mold (third phase).
  • the known device according to DE-PS 20 21 182 is also referred to as a two-circuit casting unit, since in the first circuit during the first and second working phases of the plunger and in the second circuit during the third working phase of the multiplier piston with pressure medium from different piston accumulators.
  • the multiplier piston is designed with a piston rod provided on both sides of the piston, so that there is a front annular surface on the multiplier piston itself and a further circular surface on the rear piston rod for pressurizing the multiplier piston. This has the advantage that a separate regulation of the annular pressure space on the multiplier piston and the additional rear cylinder space behind the piston rod is made possible.
  • passage valves are provided, which are attached to the piston rod of the plunger or to the piston rod of the casting piston connected to it by displacement sensors. Via the valve control, pressure is first applied to the rear cylinder space behind the rear piston rod of the multiplier piston, which medium passes through the central bore to the cylinder space of the press cylinder and thus to the press piston (first and second Work phase).
  • a passage valve for pressurizing the annular cylinder chamber of the multiplier piston and the rear cylinder chamber with pressure medium is opened by a displacement sensor or by pressure-dependent switching, the center bore in the multiplier piston automatically closing when the pressure rises.
  • the pressure medium is pushed out in front of the plunger during the first and second phase of work through an outlet bore into an oil container without special control and pressure control and admitted again when the plunger is reset.
  • the pressure medium in front of the multiplier piston in the cylinder chamber of the multiplier is also conveyed into an oil tank via a throttle valve when it moves forward in the third working phase (holding pressure phase) and is pumped in again when the multiplier piston is reset.
  • the regulation and control of plunger and multiplier piston is therefore done in the known device only via the time the pressure medium is connected to the individual pressure chambers in the press cylinder and in the multiplier cylinder or to the rear cylinder chamber, additional throttle valves allowing a certain amount regulation by a pressure drop. There is no other influence in the control system due to the lack of control options.
  • Multiplier arrangements have also become known from the literature reference Ernst Brunnhuber: “Praxis der Druckgußfertigung”, 3rd edition, 1980, which are explained in more detail on pages 70 to 78.
  • pages 73, 75 show multiplier arrangements on a casting drive, by means of which it is also possible to work in a three-phase system.
  • the Activation of the pressure accumulator for the holding pressure phase also via an impulse from the casting piston by opening a shot valve.
  • additional regulation of the multiplier pressure by means of a counterpressure by means of a further pressure accumulator is proposed, by means of which the forward movement of the multiplier piston is braked and pressure peaks are thus avoided.
  • a through-hole in the multiplier piston is dispensed with and the pressurizing of the plunger is carried out directly in the cylinder space behind it.
  • a first pressure accumulator acts directly on the cylinder space of the plunger, also called the drive piston.
  • a second pressure accumulator acts on the multiplier piston through the corresponding pulse.
  • the actual values and possibly also the target values are corrected in order to improve the casting result in subsequent casting processes.
  • the casting conditions are therefore monitored during the die casting process and corrected if necessary in subsequent casting processes.
  • All known casting process monitoring methods have the disadvantage that the casting parameters determined during the casting process cannot act directly on the casting process that is taking place, since a feedback of the determined casting parameters is not provided.
  • the invention is based on the object of proposing an improved method for monitoring the casting process and in particular for regulating the process of a die casting machine and a corresponding device for carrying out the method.
  • the method according to the invention or the corresponding device for carrying out the method has the advantage over the known prior art that a so-called real-time controlled two-circuit casting unit is created, with which a direct influence on the casting parameters is made possible during the casting process.
  • the plunger or drive piston is quasi “clamped” in the associated press cylinder and the multiplier piston in the associated multiplier cylinder space between a front and a rear adjustable pressure cushion, so that during the three-phase movement the respective pistons move forward or backward in both their speed as well as their acceleration behavior can be regulated separately and in a coordinated manner.
  • the cylinder space in front of the plunger and in front of the multiplier piston is accordingly used as a controllable pressure chamber, the regulation known in this regard being improved in the case of multiplier pistons in such a way that the control values can be fed back directly.
  • pressure peaks at the end of the mold filling phase can be reduced or prevented both by braking the plunger and by possibly reversing the multiplier piston depending on these movements.
  • the third working phase with the build-up of holding pressure can also be carried out in an optimally short time by coordinating the movement of the two pistons, the control times taking less than 5 ms.
  • Any change in the speed of the casting plunger can therefore be achieved by controlling the plunger in the first and second working phases alone and the multiplier plunger in the third working phase by coordinating the hydraulic quantity flowing to these two cylinder spaces, with higher accelerations are possible than is possible with a hydraulic medium supply from only one hydraulic medium reservoir.
  • the casting drive 1 shown in FIG. 1 is used to actuate a casting set 2, consisting of a casting chamber 3 with the molten metal 4 contained therein and a casting piston 5 for inserting the molten metal 4 into a mold cavity, not shown in any more detail.
  • the casting piston 5 is connected to the casting drive 1 via a casting piston rod 6.
  • the casting drive 1 consists of a front press cylinder 7, with a press piston 8 guided therein, which serves as a drive piston 8 for the associated piston rod 9.
  • the piston rod 9 is connected to the casting piston rod 6.
  • the press cylinder 7 has a front cylinder chamber 10 and a rear cylinder chamber 11, which are separated by the press piston 8.
  • the front cylinder space 10 is connected to a pressure medium connection 14 via a radial and subsequently axial bore 12 in the cylinder head 13.
  • the press cylinder 7 is followed by a multiplier device 15, consisting of a closed multiplier cylinder housing 16 with a multiplier piston 17 axially displaceable therein, which separates the multiplier cylinder chamber into a front closed cylinder chamber 18 and a rear closed cylinder chamber 19.
  • the multiplier piston 17 points forward in a manner known per se, i. H. towards the casting set 2, pointing first piston rod 20, which extends through the cylinder wall of the multiplier cylinder housing into the rear cylinder space 11 of the press cylinder 7.
  • the multiplier piston 17 also has a rear piston rod 21, which also extends laterally via the multiplier cylinder housing into a rear cylinder chamber 22 of an additional connection housing 23.
  • the multiplier piston 17 with the front piston rod 20 and the rear piston rod 21 is penetrated by a central longitudinal bore 24, in which a check valve 25 is arranged.
  • the check valve 25 is pressed away from the valve seat by means of a rod 26 protruding through the longitudinal bore 24 and thus opened.
  • the rear cylinder space 19 of the multiplier cylinder can be acted upon by the pressure medium connection 28, the rear cylinder space 22 of the additional connection housing 23 via the pressure medium connection 29.
  • Each position of the casting piston rod 6 or the piston rod 9 is detected by means of a displacement / speed / acceleration measuring device 30.
  • the measuring device can be carried out, for example, as described in DE 32 09 834 A1.
  • a series of quickly controllable servo-proportional valves also called continuous valves, is used to produce a real-time controlled two-circuit casting unit.
  • continuous valve assemblies 33, 34 By using at least two continuous valve assemblies 33, 34 and by coordinating the corresponding piston surfaces A1 of the plunger 8 and the annular surface A2 of the multiplier piston 17 and the circular surfaces A 2.1 of the front piston rod 20 and A 2.2 of the rear piston rod 21, the sequence of movements coordinated the casting drive.
  • the basic structure or the arrangement of the casting drive is shown again.
  • the pressure in the pressure chambers 10, 11 or 18, 19 or 22 can be detected by means of p / U transducer and evaluated as a control signal.
  • the servo-proportional valve 33 accordingly regulates the pressure conditions in the front cylinder chamber 10 (pressure p2 on the transducer 44) of the press cylinder 7 and causes a kind of clamping of the plunger 8 between the pressure chamber 10 (pressure p2) and the pressure chamber 11 (pressure p1).
  • the latter can be detected by means of the p / U converter 45 and can therefore be regulated. The movement of the plunger 8 can thus be controlled.
  • the servo proportional valve 34 regulates the rear pressure chamber 19 of the multiplier piston 17, the front pressure chamber 18 of the multiplier piston preferably also being regulated via a further servo proportional valve 35.
  • These continuous valves can also be assigned p / U transducers, not shown in more detail, in order to detect and thus regulate the pressure conditions in the pressure chambers 18, 19.
  • a fast-switching servo-proportional valve 36 at the pressure medium connection 29 is also used to control the rear cylinder chamber 22, so that the application of pressure chamber 22 via a first pressure accumulator 37 and the application of pressure chamber 19 via a second pressure accumulator 38 via one fast switching proportional valve control can take place. Additional p / U transducers can also be used here.
  • both the plunger 8 and the multiplier piston 17 are “clamped” on both sides, so that a sensitive movement can take place in all axial directions, ie forwards and backwards.
  • the pressure in the individual pressure rooms continues to serve as the measured variable.
  • the associated measurement data from the measurement devices 30, 31 or the p / U transducers 44, 45 etc. lead via measurement lines 39, 40 to a computer 41 (see FIGS.
  • the continuous valve assemblies or servo proportional valves 33 to 36 are then controlled by the computer 41 so that the movement sequence of the casting drive can be checked and regulated in every phase during the casting process.
  • the corresponding pressure P F in the mold cavity or the corresponding temperature sensors T F in the melt can be detected by corresponding additional pressure sensors in the mold cavity and fed to the computer 41 via the control lines 42, 43.
  • Pressure peaks at the end of the mold filling phase can then be reduced or avoided altogether by braking the plunger 8 as well as by possibly reversing the multiplier piston 17 depending on these movements.
  • the build-up of the holding pressure can also take place in an optimally short time by coordinating the movements of these two pistons, the regulation of the proportional valves 33 to 36 taking place in a time of less than 5 ms.
  • the speed changes of the plunger 8 and thus the casting piston 5 to influence the casting speed can be influenced by tuning the amount of hydraulic medium flowing to the press cylinder 7 to act on the plunger 8 and to the multiplier cylinder to act on the multiplier piston 17, with higher accelerations of the two pistons being possible than this with the hydraulic medium supply from only one hydraulic medium reservoir. Appropriate clamping of the two pistons controls and influences any movement of the casting drive.
  • the piston surfaces A 2.1 and A 2.2 are to be designed so that, for. B. during the forward movement of the multiplier piston, the amount of the medium flowing in at A 2.2 , ie the rear piston rod of the multiplier piston, for movement to the amount of the medium displaced at A 2.1 in the range of the ratio 0.8 to 1.2: 1.
  • the diagrams shown in FIG. 4 relate to target value specifications for controlling the casting process.
  • v f (s) as target value specification of the speed of the casting piston via the casting piston path.
  • the values s1 to s4 represent certain waypoints of the casting piston, and a certain speed can be assigned to each waypoint. For example, at point s4 the casting piston speed is braked to a residual speed shortly before the mold filling end.
  • the invention is not restricted to the exemplary embodiment shown and described. Rather, it includes everyone Professional developments and improvements of the device according to the invention and of the method according to the invention within the scope of the inventive concept.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
EP93106696A 1992-06-05 1993-04-24 Procédé et dispositif pour commande de processus pour une machine à mouler sous pression Expired - Lifetime EP0576795B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4218556 1992-06-05
DE4218556A DE4218556A1 (de) 1992-06-05 1992-06-05 Verfahren und Vorrichtung zur Durchführung des Verfahrens zur Prozeßsteuerung einer Druckgießmaschine

Publications (3)

Publication Number Publication Date
EP0576795A1 true EP0576795A1 (fr) 1994-01-05
EP0576795B1 EP0576795B1 (fr) 1997-05-28
EP0576795B2 EP0576795B2 (fr) 2002-01-16

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ID=6460458

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Application Number Title Priority Date Filing Date
EP93106696A Expired - Lifetime EP0576795B2 (fr) 1992-06-05 1993-04-24 Procédé et dispositif pour commande de processus pour une machine à mouler sous pression

Country Status (5)

Country Link
US (1) US5365999A (fr)
EP (1) EP0576795B2 (fr)
JP (1) JPH0631427A (fr)
DE (2) DE4218556A1 (fr)
ES (1) ES2102547T5 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2295171A1 (fr) * 2009-09-15 2011-03-16 Richard Oberle Procédé et agencement de commutation hydraulique pour le fonctionnement d'une installation de moulage sous pression métallique
EP3421155A1 (fr) * 2017-06-28 2019-01-02 Parker Hannifin Manufacturing Germany GmbH & Co. KG Système de commutation hydraulique pour une machine de moulage sous pression à chambre froide

Families Citing this family (16)

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Publication number Priority date Publication date Assignee Title
DE4419848C1 (de) * 1994-06-07 1995-12-21 Frech Oskar Gmbh & Co Warmkammer-Druckgießmaschine
US5630463A (en) * 1994-12-08 1997-05-20 Nelson Metal Products Corporation Variable volume die casting shot sleeve
DE19529279C1 (de) * 1995-08-09 1996-11-21 Bayerische Motoren Werke Ag Druckgießmaschine
US5988260A (en) * 1996-03-05 1999-11-23 Toshiba Kikai Kabushiki Kaisha Method for controlling injection in a die casting machine and apparatus for the same
US6082438A (en) * 1997-10-08 2000-07-04 Outboard Marine Corporation Method and system for the control of a vacuum valve of a vacuum die casting machine
BE1010155A6 (fr) * 1997-11-05 1998-01-06 Buehler Ag Procede pour l'actionnement d'un piston d'entrainement et dispositif en vue de l'execution du procede.
JP3530730B2 (ja) * 1997-11-27 2004-05-24 東芝機械株式会社 ダイカストマシンの射出制御方法及び装置
JP3332871B2 (ja) 1998-11-02 2002-10-07 東芝機械株式会社 ダイカストマシンの射出制御方法および装置
CZ20023744A3 (cs) * 2000-04-20 2003-06-18 Procontrol Ag Způsob, jakož i hnací systém pro řízení / regulaci lineárního lisovacího / licího pohybu
JP3878540B2 (ja) * 2002-11-22 2007-02-07 東洋機械金属株式会社 ダイカストマシン
WO2008086181A1 (fr) * 2007-01-05 2008-07-17 Buhlerprince, Inc. Machine à couler sous pression avec pression d'injection statique réduite
KR100801749B1 (ko) * 2007-10-16 2008-02-11 주식회사 한반도건축감리건축사사무소 공동주택의 수목 보호대
DE102008055536A1 (de) * 2008-12-17 2010-07-01 Bühler Druckguss AG Verfahren zum Betreiben eines Antriebskolbens einer Druckgiessmaschine und Vorrichtung zur Durchführung des Verfahrens
DE102020100588B4 (de) * 2020-01-13 2021-10-07 AHP Merkle GmbH Messvorrichtung für eine Nachverdichtungsanordnung sowie Verfahren zur Prozesskontrolle einer Nachverdichtung in einem Gießprozess
DE102020204634A1 (de) 2020-04-09 2021-10-14 Oskar Frech Gmbh + Co. Kg Gießkolbensystem und Gießverfahren für eine Druckgießmaschine
DE102020004742A1 (de) 2020-08-05 2022-02-10 Daimler Ag Antriebseinrichtung für eine Druckgussanlage zur Herstellung von Druckgussbauteilen

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EP0065841A2 (fr) * 1981-05-15 1982-12-01 Toyota Jidosha Kabushiki Kaisha Procédé et dispositif pour inspecter la qualité des pièces moulées par injection
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DE3209834A1 (de) * 1981-03-18 1982-09-30 Toshiba Kikai K.K., Tokyo Vorrichtung zur feststellung der verschiebung eines druckkolbens einer druckgiessmaschine
EP0065841A2 (fr) * 1981-05-15 1982-12-01 Toyota Jidosha Kabushiki Kaisha Procédé et dispositif pour inspecter la qualité des pièces moulées par injection
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2295171A1 (fr) * 2009-09-15 2011-03-16 Richard Oberle Procédé et agencement de commutation hydraulique pour le fonctionnement d'une installation de moulage sous pression métallique
EP3421155A1 (fr) * 2017-06-28 2019-01-02 Parker Hannifin Manufacturing Germany GmbH & Co. KG Système de commutation hydraulique pour une machine de moulage sous pression à chambre froide

Also Published As

Publication number Publication date
ES2102547T3 (es) 1997-08-01
EP0576795B1 (fr) 1997-05-28
EP0576795B2 (fr) 2002-01-16
JPH0631427A (ja) 1994-02-08
ES2102547T5 (es) 2002-08-16
DE59306564D1 (de) 1997-07-03
DE4218556A1 (de) 1993-12-09
US5365999A (en) 1994-11-22

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