EP0512630B1 - Regelung einer Druckgussvorrichtung - Google Patents

Regelung einer Druckgussvorrichtung Download PDF

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Publication number
EP0512630B1
EP0512630B1 EP92201229A EP92201229A EP0512630B1 EP 0512630 B1 EP0512630 B1 EP 0512630B1 EP 92201229 A EP92201229 A EP 92201229A EP 92201229 A EP92201229 A EP 92201229A EP 0512630 B1 EP0512630 B1 EP 0512630B1
Authority
EP
European Patent Office
Prior art keywords
pressure
molten metal
piston
pump
mould
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.)
Expired - Lifetime
Application number
EP92201229A
Other languages
English (en)
French (fr)
Other versions
EP0512630A1 (de
Inventor
Michel Vansnick
Luc De Keyzer
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.)
Solvay SA
Original Assignee
Solvay SA
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 Solvay SA filed Critical Solvay SA
Publication of EP0512630A1 publication Critical patent/EP0512630A1/de
Application granted granted Critical
Publication of EP0512630B1 publication Critical patent/EP0512630B1/de
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Expired - Lifetime legal-status Critical Current

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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
    • B22D17/32—Controlling equipment

Definitions

  • the present invention relates to a method for molding a fusible core from molten metal in which the molten metal is pressed under pressure into a suitable mold.
  • a technique widely used for the molding of fusible cores consists in pushing back the molten metal, in a pipe connected to the mold, under the effect of a gas pressure.
  • Another possible technique consists in using a positive displacement pump which allows an unequivocal relation between the level reached by the front of molten metal in the mold and the quantity of molten metal delivered by the pump.
  • this technique does not, a priori, allow regular filling of the molds, in particular, in the case of molds having variable sections and / or requiring one or more tilting operations during filling.
  • the present invention therefore relates to a process for molding fusible cores using a positive displacement pump which allows, in a simple manner, regular production of fusible cores practically free from defects.
  • the present invention therefore relates to a method for molding a fusible core from a molten metal in which the molten metal is discharged into a mold by means of a positive displacement pump which is characterized in that 'The pressure of the pumped metal is measured and in that the flow rate of the pump is adapted so that the increasing pressure imposed on the pumped molten metal does not undergo sudden variation throughout the duration of the mold filling cycle.
  • the positive displacement pump can be of any type adapted to the nature of the material, molten metal, to be treated. However, it is preferred to use a positive displacement pump of the piston type because this type of pump allows a unique relationship between the position of the piston and the quantity of molten metal discharged into the mold. In this case, during filling of the mold, the displacement speed imposed on the piston of the positive displacement pump is controlled so as to avoid any sudden variation in the pressure exerted on the molten metal discharged into the mold during its filling.
  • a first molding is carried out by imposing a constant speed of movement on the piston and the positions of the piston are noted for which a variation is recorded sudden pressure of the molten metal discharged (passage of the front of molten metal discharged into variable sections of the mold).
  • Examination of the diagram of the variation of the pressures recorded as a function of the successive positions of the piston makes it possible, moreover, to determine the variation in speed to be imposed on the displacement of the piston, in these raised positions, to maintain a filling under an increasing pressure of regularly and without abrupt variation.
  • the Applicant prefers to use a hydraulic type control to control the movements of the piston, but it is obvious that other types of control such as, for example, control by an electric motor, can be used in the context of the process according to the invention.
  • the aim of the adjustment to be made is therefore to adapt, by a prior test, the speed of displacement of the piston in a given range so that the pressure profile of the metal discharged into the mold does not undergo sudden variation over time, this procedure being iterative until the mold is completely filled.
  • the degassing vents provided in the mold do not have a constant behavior over time, the latter possibly, in fact, having a tendency to clog gradually or suddenly with the direct consequence of the development of '' a strong back pressure in the mold. Since this back pressure can have a negative influence on the pressure measured on the molten metal, it is important that the procedure for developing the molding cycles be carried out with molds whose vents are kept clear. As soon as this development procedure is completed and, consequently, during the subsequent industrial production cycle, a possible blockage of one or more vents becomes without effect on the filling of the mold since the latter is volumetric. In fact, the plugging of a vent is revealed only by a drift of the pressures measured during the successive fillings.
  • tilting the mold during filling may prove essential, when making certain types of fusible cores, to avoid a spill of molten metal which can cause waves and thus lead to the production of faulty fuse cores.
  • the method according to the invention can be easily adapted to the filling of molds requiring such a tilting.
  • the displacement dimensions of the piston of the pump are determined which correspond to filling levels of the mold for which it is necessary to impose one or more successive tiltings. in the mold.
  • a first filling of the mold is carried out at a constant speed of displacement of the piston by tilting the mold to the appropriate dimensions and the diagram of variation of the pressure of the metal expelled is noted.
  • the pump it also appears advantageous to equip the pump with a pressure regulator whose function is to limit the maximum pressure exerted by the pump on the molten metal discharged.
  • the pressure regulator limit the maximum pressure exerted on the molten metal to a value slightly greater than the monometric height corresponding to the total filling of the mold.
  • a growing profile is predetermined for the pressure of the molten metal to be discharged into the mold, the pressure of the molten metal discharged is continuously noted. during manufacture and, from this measurement, the volumetric pump flow rate is continuously adjusted so as to comply with the predetermined increasing pressure profile.
  • the method according to this variant can advantageously be carried out by using an automatic comparator-regulator system which at any time during the manufacturing cycle compares the measured pressure of the molten metal discharged with the instantaneous value of the predetermined pressure and which, in the event of disparity between these pressure values, acts on the pump flow so as to compensate for this disparity.
  • the device as illustrated in FIG. 1 comprises a mold 1 suitable for molding a fusible core, the cavity of which is connected by a pipe 2 to a positive displacement pump 3 with piston 4 designed to allow the delivery of a molten metal into the cavity of the mold 1.
  • the pipe 2 is provided with a measuring device 5 making it possible to record the pressure of the discharged molten metal.
  • the piston 4 is controlled by a hydraulic cylinder 6 and is equipped with a device 7 making it possible to continuously record the successive positions occupied by the piston 4.
  • the hydraulic cylinder 6 is supplied via a distributor proportional 8 connected to a pressurized hydraulic fluid supply circuit comprising a storage tank 9, a pump 10 and a pressure regulator 11 which limits the pressure of the hydraulic fluid delivered to a value of 20 bars.
  • the device is completed by a rapid regulation loop 12 which controls, via the control 13, the proportional distributor 8, this loop being connected to the device 7 raising the instantaneous position of the piston 4.
  • the device as described is used as follows for the production of a series of fusible cores.
  • a first fusible core is produced by imposing a constant speed of movement on the piston 4 and therefore under a constant flow rate of molten metal repelled and, during this production cycle, it is continuously detected using the device 5, the pressure of the molten metal discharged and, using device 7, the corresponding successive positions of the piston 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Claims (4)

  1. Verfahren für das Gießen eines Schmelzkerns aus einem geschmolzenen Metall, bei dem das geschmolzene Metall mittels einer Verdrängerpumpe unter Druck in eine Form gefördert wird, dadurch gekennzeichnet, daß man den Druck des geförderten Metalls mißt, und daß man den Durchsatz der Pumpe so anpaßt, daß der anwachsende Druck, dem das geförderte geschmolzene Metall unterliegt, sich während der Dauer des Füllzyklus der Form nicht plötzlich ändert.
  2. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß die Verdrängerpumpe eine Kolbenpumpe ist, die durch eine schnelle Regelschleife kontrolliert und durch einen hydraulischen Verteiler angetrieben wird, und dadurch, daß während des Füllens der Form die Geschwindigkeit der Bewegung des Kolbens der Verdrängerpumpe kontrolliert wird, so daß jede plötzliche Veränderung des auf das in die Form geförderte geschmolzene Metall ausgeübten Drucks während ihrer Füllung vermieden wird.
  3. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß man die Pumpe mit einem Druckregler ausstattet, der die Begrenzung des auf das geschmolzene Metall maximal ausgeübten Drucks auf einen Wert ermöglicht, der leicht höher ist als die monometrische Höhe, die der Gesamtfüllung der Form entspricht.
  4. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß man ein steigendes Profil für den Druck des in die Form zu fördernden geschmolzenen Metalls festlegt, man kontinuierlich den Druck des geförderten geschmolzenen Metalls während der Herstellung aufnimmt, und man ausgehend von dieser Messung kontinuierlich den Durchsatz der Verdrängerpumpe reguliert, um das vorher festgelegte steigende Druckprofil einzuhalten.
EP92201229A 1991-05-10 1992-05-02 Regelung einer Druckgussvorrichtung Expired - Lifetime EP0512630B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9105857A FR2676190B1 (fr) 1991-05-10 1991-05-10 Procede pour le moulage d'un noyau fusible.
FR9105857 1991-05-10

Publications (2)

Publication Number Publication Date
EP0512630A1 EP0512630A1 (de) 1992-11-11
EP0512630B1 true EP0512630B1 (de) 1996-08-28

Family

ID=9412790

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92201229A Expired - Lifetime EP0512630B1 (de) 1991-05-10 1992-05-02 Regelung einer Druckgussvorrichtung

Country Status (4)

Country Link
US (1) US5240064A (de)
EP (1) EP0512630B1 (de)
DE (1) DE69213086T2 (de)
FR (1) FR2676190B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3640704B2 (ja) * 1994-08-18 2005-04-20 トヨタ自動車株式会社 加圧鋳造方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893792A (en) * 1973-04-06 1975-07-08 Bbf Group Inc Controller for injection molding machine
JPS5418218B2 (de) * 1974-02-12 1979-07-05
DE3142811A1 (de) * 1981-10-28 1983-05-05 Idra Pressen GmbH, 7000 Stuttgart Verfahren und vorrichtung zur regelung der giesskolbenbewegung waehrend des einpressvorganges an einer druckgiessmaschine
JPS591059A (ja) * 1982-06-25 1984-01-06 Toshiba Mach Co Ltd ダイカストマシンの射出速度制御方法
JPS59150652A (ja) * 1983-02-17 1984-08-28 Ube Ind Ltd ダイカスト機におけるメタル圧測定方法
JPS59174332A (ja) * 1983-03-23 1984-10-02 Toshiba Mach Co Ltd 射出工程の圧力監視装置
JPS59189060A (ja) * 1983-04-12 1984-10-26 Ube Ind Ltd 射出成形装置におけるシリンダ速度制御方法
CH668385A5 (de) * 1985-10-24 1988-12-30 Buehler Ag Geb Einspritzeinheit fuer eine giessmaschine.
IT1215434B (it) * 1987-04-21 1990-02-14 Sgs Microelettronica Spa Saturazione. stadio amplificatore con uscita di collettore, con controllo della
JPS6415260A (en) * 1987-07-06 1989-01-19 Toshiba Corp Method and apparatus for pressurized-casting

Also Published As

Publication number Publication date
DE69213086D1 (de) 1996-10-02
FR2676190A1 (fr) 1992-11-13
US5240064A (en) 1993-08-31
EP0512630A1 (de) 1992-11-11
DE69213086T2 (de) 1997-03-27
FR2676190B1 (fr) 1996-01-05

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