EP0600324B1 - Method to generate low pressure in die casting machine - Google Patents
Method to generate low pressure in die casting machine Download PDFInfo
- Publication number
- EP0600324B1 EP0600324B1 EP93118695A EP93118695A EP0600324B1 EP 0600324 B1 EP0600324 B1 EP 0600324B1 EP 93118695 A EP93118695 A EP 93118695A EP 93118695 A EP93118695 A EP 93118695A EP 0600324 B1 EP0600324 B1 EP 0600324B1
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- EP
- European Patent Office
- Prior art keywords
- vacuum
- casting
- casting chamber
- melt
- chamber
- 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.)
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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
- B22D17/14—Machines with evacuated die cavity
- B22D17/145—Venting means therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/32—Controlling equipment
Definitions
- the invention relates to a method for producing the Vacuum in a die casting machine, especially one Vacuum die casting machine according to the preamble of the claim 1.
- EP 0 051 310 B1 is a die casting machine become known, after the so-called vacuum die casting process is working. With this procedure the Molten metal from a holding furnace through an intake pipe sucked the casting chamber by means of negative pressure, the Negative pressure via a suction channel in the mold parting area the mold is applied.
- Die casting machines also have the problem of adequate Degassing the melt during the casting process becomes a by using the vacuum die casting process Residual gas and from turbulence in the melt and others Contamination still considerable loss of quality are to be accepted.
- multiple vacuum ports to improve evacuation.
- Especially this cited reference itself proposes one further vacuum connection through the casting piston itself to make.
- the vacuum (vacuum) applied to the casting mold can be so long effective until the mold through the Feed movement of the casting piston filled with liquid metal is, on the mold a valve with a hydraulically actuated locking piston, which is a Penetration of the molten metal into the suction channel is prevented.
- From US-A-4 050 503 (same as DE-A-24 39 470) is a Process for controlling a vacuum of a vacuum die casting machine known.
- the inventive method with the characteristic Features of claim 1 aims and achieves one significant improvement in air evacuation in particular in the known vacuum die casting process.
- the procedure can also in the normal die casting process for evacuating the air be applied.
- the invention is based on the main idea that applied vacuum not only in size, d. H. with regard to the negative pressure produced and with regard to the duty cycle is taken into account, but the vacuum can also meet the respective conditions of the Die casting process can be adjusted precisely.
- turbulence Metal flow can be avoided.
- one optimal degassing of the metal achieved.
- By a continuous regulation or control of the absolute pressure of the vacuum during the casting process are therefore considerable Improvements in die cast products achieved.
- According to the invention is particularly precise regulation of the vacuum with regard to an undesirable premature Entry of the molten metal into the mold cavity during the Gun chamber filling avoided, leading to undesirable Flow marks on the casting leads.
- the invention is based on a vacuum die casting machine described. It can also be used for "evacuation” Use normal die casting machines when the plunger has closed the filling opening.
- FIG. 1 shows a die casting machine 1, which is only indicated the fixed platen 2 with the fixed platen Mold half 3 shown with the movable mold half 4 interacts. Between the fixed 3 and the movable Mold half 4 is the mold cavity 5 with Metal melt is to be filled. There is a casting chamber 6 for this provided with a casting piston 7, in which the Metal melt 8 via a suction pipe 9 from a Warming device 10 is sucked.
- the metal melt is not used in the vacuum pressure casting process through a pouring process, but by creating a Vacuum or negative pressure from the warming device 10 sucked in.
- the suction process takes place through the Intake pipe 9 via the casting chamber 6 and the mold cavity 5.
- Vacuum valve 11 with a vacuum connection line 12, which leads to a switching valve 13.
- the vacuum line 12 is from Switch valve 13 continued to a vacuum tank 14 which a vacuum pump 15 for producing the negative pressure connected.
- the vacuum valve 11 of the mold is used to shut off the if necessary up to this location by means of the casting piston 7 injected molten metal. Penetration of the metal in the subsequent vacuum connection line 12 is thus avoided.
- this is applied via the vacuum valve 11 Vacuum over the switching valve 13 in its pressure profile regulated that the pressure in the mold cavity 5, in the Casting chamber 6 and in the suction pipe 9 after a certain adjustable function regulates per time unit.
- a computer 16 is provided which has a wide variety of parameters detected. So the vacuum in the area of the vacuum valve 11 detected via an additional measuring line 17 and by means of measured with a vacuum probe. This vacuum probe 18 is via an additional shunt valve 19 to the vacuum connection line 12 connected. So the pressure p in the vacuum connection line 12 detectable and via the line 20 can be fed to the computer 16.
- the vacuum pressure in the system can also be measured via other measuring lines are supplied to the computer 16 in the system. This is for example through a measuring line 21 to the vacuum tank 14 indicated.
- the vacuum ie the negative pressure in the system
- p f (t) .
- the pressure curve set over time can take a progressive, a linear or a degressive curve.
- the switching valve 13 in the vacuum connecting line is actuated via the computer 16, for example via the control line 22, in such a way that the desired pressure profile in the vacuum line 12 is established.
- the computer 16 can control the vacuum valve 11 via a control line 23 and control the shunt valve 19 via a further control line 24.
- the production of the vacuum itself ie the operation of the vacuum pump 15, can also take place via a further control line 25.
- the melt 8 is sucked absolutely out of the warming device 10 via a throttle 30 located at the lower end of the suction pipe 9 into the casting chamber 6 by applying a high negative pressure in the order of magnitude of p 1 ⁇ 150 to 200 mbar.
- the size of the throttle 30, the suction time t 1 and the negative pressure p 1 determine the amount m 1 of the molten metal drawn into the casting chamber.
- An additional sensor z. B. an ultrasonic sensor 28 in the upper wall of the casting chamber or a resistance sensor 28 'in the sprue cross section of the mold half 4 can detect the fill level h 1 in the casting chamber 6 and supply this value to the computer 16 for evaluation via a measuring line 29.
- the suction process in vacuum die casting machines can be as first control section by running over the casting piston 7 via the suction or inlet opening 27 into the casting chamber 6 or by a correspondingly reduced negative pressure (Pressure increase) are ended. It corresponds to that Filling process of molten metal into a "normal" Die casting device.
- the position of the Pouring piston 7 via a position sensor 31 to computer 16 can be supplied via a line 32, in particular also in "normal” casting chambers, the piston position after running over the fill opening 27 to detect and regulate the vacuum. Sensors for detecting the path or the fill level are known per se (see e.g., Maschinen mod 1992, 40, Pages 72 - 77).
- This first filling period t 1 is followed by a further “holding period” t 2 .
- a certain holding time of the vacuum of t 2 ⁇ 0.2 to 3 seconds is set over a period of time t 2 after a continuous drop in the vacuum (pressure rise) to a vacuum of preferably p 2 ⁇ 800 mbar absolute.
- This holding time can be calculated depending on the specific metal weight, the suction pipe height h 2 above or the fill level h 1 in the casting chamber and the shape of the mold.
- the invention further provides that when the melt 8 passes from the suction pipe 9 into the casting chamber 6 at the inlet opening 27 of the casting chamber, a constant melt speed v ⁇ 1 m / sec is set on the basis of the controllable low pressure, flow values preferably being chosen below 1 m / sec.
- the casting piston 7 is provided in its lower region with a deflection surface 26, as is described in the applicant's prior publication according to DE 41 01 592.
- the casting mold is filled in a manner known per se by the displacement of the piston 7 in the casting chamber 6 in a pre-filling and mold-filling phase.
- the control of the negative pressure over this third time period t 3 serves to extract the remaining air or gas components.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
Die Erfindung betrifft ein Verfahren zur Herstellung des Unterdrucks bei einer Druckgießmaschine insbesondere einer Vakuum-Druckgießmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to a method for producing the Vacuum in a die casting machine, especially one Vacuum die casting machine according to the preamble of the claim 1.
Aus der EP 0 051 310 B1 ist eine Druckgießmaschine bekanntgeworden, die nach dem sogenannten Vakuum-Druckgießverfahren arbeitet. Bei diesem Verfahren wird die Metallschmelze aus einem Warmhalteofen über ein Ansaugrohr in die Gießkammer mittels Unterdruck angesaugt, wobei der Unterdruck über einen Absaugkanal in der Formteilungsfläche der Gießform aufgebracht wird. Wie in der zitierten Literaturstelle weiterhin beschrieben, stellt sich bei Druckgießmaschinen auch das Problem einer ausreichenden Entgasung der Schmelze während des Gießvorganges dar. Zwar wird durch Anwendung des Vakuum-Druckgießverfahrens eine Restgas und von Verwirbelungen der Schmelze sowie sonstigen Verunreinigungen noch erhebliche Qualitätseinbußen hinzunehmen sind. Um eine Verbesserung zu erzielen, wurden in den in der oben genannten Literaturstelle weiterhin zitierten Veröffentlichungen vorgeschlagen, mehrere Vakuumanschlüsse zur Verbesserung der Evakuierung vorzusehen. Insbesondere schlägt diese zitierte Literaturstelle selbst vor, einen weiteren Vakuumanschluß durch den Gießkolben selbst vorzunehmen.EP 0 051 310 B1 is a die casting machine become known, after the so-called vacuum die casting process is working. With this procedure the Molten metal from a holding furnace through an intake pipe sucked the casting chamber by means of negative pressure, the Negative pressure via a suction channel in the mold parting area the mold is applied. As quoted in the Literature continues to be described Die casting machines also have the problem of adequate Degassing the melt during the casting process becomes a by using the vacuum die casting process Residual gas and from turbulence in the melt and others Contamination still considerable loss of quality are to be accepted. To achieve an improvement, in those cited in the above-mentioned literature reference Publications suggested multiple vacuum ports to improve evacuation. Especially this cited reference itself proposes one further vacuum connection through the casting piston itself to make.
Der an die Gießform angelegte Unterdruck (Vakuum) kann so lange wirksam sein, bis die Gießform durch die Vorschubbewegung des Gießkolbens mit flüssigem Metall gefüllt ist, wobei sich an der Gießform ein Ventil mit einem hydraulisch betätigbaren Sperrkolben befindet, der ein Eindringen der Metallschmelze in den Absaugkanal verhindert.The vacuum (vacuum) applied to the casting mold can be so long effective until the mold through the Feed movement of the casting piston filled with liquid metal is, on the mold a valve with a hydraulically actuated locking piston, which is a Penetration of the molten metal into the suction channel is prevented.
Aus der Literaturstelle "Gießerei" 69 (1982) Heft 19, Seite
521/527 wird bei einem derartigen Gießverfahren darauf
hingewiesen, daß die Zeitdauer des angelegten Vakuums von
Bedeutung ist. Die Vakuumeinwirkzeit ist neben der Größe des
eingestellten Unterdrucks demnach ein wichtiger Parameter, um
eine richtige und effektive Evakuierung der einzelnen Teile,
nämlich Saugrohr, Gießkammer und Druckgießform zu erzielen.From the literature "Gießerei" 69 (1982)
Aus der US-A-4 050 503 (gleich DE-A-24 39 470) ist ein Verfahren zur Regelung eines Unterdrucks einer Vakuum-Druckgießmaschine bekannt geworden. Dabei dient die steuerbare Änderung des Unterdrucks ausschließlich zur Erzeugung der richtigen Füllgeschwindigkeit des Metalls in der Form, unter Berücksichtigung von unterschiedlichen Querschnitten in der Vorrichtung. From US-A-4 050 503 (same as DE-A-24 39 470) is a Process for controlling a vacuum of a vacuum die casting machine known. The serves controllable change of vacuum only for Generation of the correct filling speed of the metal in the shape, taking into account different Cross sections in the device.
Das erfindungsgemäße Verfahren mit den kennzeichnenden Merkmalen des Anspruchs 1 bezweckt und erreicht eine erhebliche Verbesserung beim Evakuieren der Luft insbesondere beim bekannten Vakuum-Druckgießverfahren. Das Verfahren kann auch beim normalen Druckgußverfahren zur Evakuierung der Luft angewandt werden. The inventive method with the characteristic Features of claim 1 aims and achieves one significant improvement in air evacuation in particular in the known vacuum die casting process. The procedure can also in the normal die casting process for evacuating the air be applied.
Der Erfindung liegt der Kerngedanke zugrunde, daß das angelegte Vakuum nicht nur hinsichtlich seiner Größe, d. h. hinsichtlich des hergestellten Unterdrucks sowie hinsichtlich der Einschaltdauer berücksichtigt wird, sondern das Vakuum kann darüber hinaus den jeweiligen Bedingungen des Druckgießverfahrens genauestens angepaßt werden. Dies geschieht erfindungsgemäß durch eine Regelung des Vakuums über die Zeitdauer der Unterdruckbeaufschlagung, d. h. das angelegte Vakuum wird in seiner Größe sowie seiner Zeitdauer einer genauesten Regelung unterworfen. Hierdurch kann auch der Einlauf der Schmelze über das Saugrohr in die Gießkammer und in die Gießform zu jedem Zeitpunkt reguliert werden, so daß - gegebenenfalls in Verbindung mit weiteren Hilfsmaßnahmen - eine optimale Befüllung sowohl der Gießkammer als auch ein optimaler Gießprozeß beim Gießvorgang selbst erzielt werden kann. Weiterhin können Turbulenzen der Metallströmung vermieden werden. Grundsätzlich wird eine optimale Entgasung des Metalls erzielt. Durch eine kontinuierliche Regelung oder Steuerung des absoluten Druckes des Vakuums während des Gießprozesses werden damit erhebliche Verbesserungen an den Druckgießerzeugnissen erzielt. Gemäß der Erfindung wird insbesondere auch eine genaue Regulierung des Vakuums im Hinblick auf einen unerwünschten vorzeitigen Eintritt der Metallschmelze in den Formhohlraum während der Gießkammerbefüllung vermieden, was zu unerwünschten Fließspuren auf dem Gußteil führt.The invention is based on the main idea that applied vacuum not only in size, d. H. with regard to the negative pressure produced and with regard to the duty cycle is taken into account, but the vacuum can also meet the respective conditions of the Die casting process can be adjusted precisely. This happens according to the invention by regulating the vacuum over the duration of the vacuum application, d. H. the vacuum is applied in its size as well as its duration subject to the most precise regulation. This can also the melt flows into the casting chamber via the suction pipe and be regulated in the mold at any time that - possibly in conjunction with others Aid measures - an optimal filling of both the Casting chamber as well as an optimal casting process during the casting process can be achieved by yourself. Furthermore, turbulence Metal flow can be avoided. Basically, one optimal degassing of the metal achieved. By a continuous regulation or control of the absolute pressure of the vacuum during the casting process are therefore considerable Improvements in die cast products achieved. According to the invention is particularly precise regulation of the vacuum with regard to an undesirable premature Entry of the molten metal into the mold cavity during the Gun chamber filling avoided, leading to undesirable Flow marks on the casting leads.
In den Unteransprüchen sind vorteilhafte und zweckmäßige Weiterbildungen des erfindungsgemäßen Verfahrens angegeben. Besonders vorteilhaft hierbei ist die kontinuierliche oder diskontinuierliche Regelung des Vakuums gegebenenfalls mit Einhaltung von Haltezeiten bei bestimmten Unterdrücken.In the subclaims are advantageous and expedient Developments of the inventive method specified. The continuous or discontinuous control of the vacuum if necessary Adherence to holding times at certain negative pressures.
Die Erfindung wird näher am Beispiel einer Vakuum-Druckgießmaschine beschrieben, die in der Zeichnung dargestellt und unter Angabe weiterer Vorteile in der nachfolgenden Beschreibung näher erläutert ist. Es zeigt
- Fig. 1
- eine Seitenansicht einer Gießkammer mit Gießkolben sowie Ansaugrohrzuführung zu einer Warmhalteeinrichtung.
- Fig. 1
- a side view of a casting chamber with casting piston and intake pipe feed to a warming device.
Die Erfindung wird anhand einer Vakuum-Druckgießmaschine beschrieben. Sie läßt sich auch für die "Evakuierung" normaler Druckgießmaschinen verwenden, wenn der Gießkolben die Einfüllöffnung verschlossen hat.The invention is based on a vacuum die casting machine described. It can also be used for "evacuation" Use normal die casting machines when the plunger has closed the filling opening.
Bezüglich dem allgemeinen Aufbau sowie den wesentlichen Funktionsmerkmalen einer Vakuum-Druckgießmaschine wird auf die eingangs erwähnte Literaturstelle und insbesondere auf die EP 0 051 310 verwiesen.Regarding the general structure and the essential Features of a vacuum die casting machine is based on the reference mentioned at the beginning and in particular on refer to EP 0 051 310.
In Fig. 1 ist von einer nur angedeuteten Druckgießmaschine 1
die feste Aufspannplatte 2 mit der hieran befestigten festen
Formhälfte 3 dargestellt, die mit der beweglichen Formhälfte
4 zusammenwirkt. Zwischen der festen 3 und der beweglichen
Formhälfte 4 befindet sich der Formhohlraum 5, der mit
Metallschmelze zu füllen ist. Hierfür ist eine Gießkammer 6
mit einem Gießkolben 7 vorgesehen, in welche die
Metallschmelze 8 über ein Saugrohr 9 aus einer
Warmhalteeinrichtung 10 angesaugt wird.1 shows a die casting machine 1, which is only indicated
the fixed platen 2 with the fixed
Beim Vakuum-Druckgießverfahren wird die Metallschmelze nicht
durch ein Eingießverfahren, sondern durch Anlegung eines
Vakuums oder Unterdrucks aus der Warmhalteeinrichtung 10
angesaugt. Dabei geschieht der Ansaugvorgang durch das
Ansaugrohr 9 über die Gießkammer 6 und den Formhohlraum 5. The metal melt is not used in the vacuum pressure casting process
through a pouring process, but by creating a
Vacuum or negative pressure from the
Hierfür befindet sich an den Formhälften 3, 4 ein
Vakuumventil 11 mit einer Vakuumanschlußleitung 12, welches
zu einem Schaltventil 13 führt. Die Vakuumleitung 12 wird vom
Schaltventil 13 fortgeführt zu einem Vakuumtank 14, an
welchem eine Vakuumpumpe 15 zur Herstellung des Unterdrucks
angeschlossen ist.For this there is on the
Das Vakuumventil 11 der Gießform dient zur Absperrung der
gegebenenfalls bis zu diesem Ort mittels des Gießkolbens 7
eingepreßten Metallschmelze. Ein Eindringen des Metalls in
die nachfolgende Vakuumanschlußleitung 12 wird damit
vermieden.The
Erfindungsgemäß wird das über das Vakuumventil 11 angelegte
Vakuum über das Schaltventil 13 so in seinem Druckverlauf
geregelt, daß sich der Druck im Formhohlraum 5, in der
Gießkammer 6 und im Saugrohr 9 nach einer bestimmten
einstellbaren Funktion pro Zeiteinheit regelt. Hierfür ist
ein Rechner 16 vorgesehen, der die verschiedensten Parameter
erfaßt. So wird der Unterdruck im Bereich des Vakuumventils
11 über eine zusätzliche Meßleitung 17 erfaßt und mittels
einer Vakuum-Meßsonde gemessen. Diese Vakuum-Meßsonde 18 ist
über ein zusätzliches Nebenschlußventil 19 an die Vakuum-Anschlußleitung
12 angeschlossen. Damit ist der Druck p in
der Vakuum-Anschlußleitung 12 erfaßbar und über die Leitung
20 dem Rechner 16 zuführbar.According to the invention, this is applied via the
Der Vakuumdruck im System kann auch über andere Meßleitungen
im System dem Rechner 16 zugeführt werden. Dies ist
beispielsweise durch eine Meßleitung 21 zum Vakuumtank 14
angedeutet.The vacuum pressure in the system can also be measured via other measuring lines
are supplied to the
Die Regelung des Vakuums, d. h. des Unterdrucks im System
erfolgt nach einem vorgegebenen Regelprogramm
Durch die erfindungsgemäße Möglichkeit der laufenden Meßung und Regelung des Vakuums können ganz bestimmte "Vakuumkurven" gefahren werden.Due to the possibility of ongoing measurement according to the invention and control of the vacuum can be very specific "vacuum curves" be driven.
Zunächst wird die Schmelze 8 aus der Warmhalteeinrichtung 10
über eine, am unteren Ende des Saugrohres 9 sich befindende
Drossel 30 in die Gießkammer 6 durch Anlegen eines hohen
Unterdrucks in der Größenordnung von p1 ∼ 150 bis 200 mbar
absolut angesaugt. Dabei bestimmt die Größe der Drossel 30,
die Ansaugzeit t1 sowie der Unterdruck p1 die in die
Gießkammer angsaugte Menge m1 der Metallschmelze. Ein
zusätzlicher Meßfühler z. B. ein Ultraschallmeßfühler 28 in
der oberen Wandung der Gießkammer oder ein
Widerstandsmeßfühler 28' im Angußquerschnitt der Formhälfte 4
kann die Füllstandshöhe h1 in der Gießkammer 6 erfassen und
diesen Wert über eine Meßleitung 29 dem Rechner 16 zur
Auswertung zuführen.First, the melt 8 is sucked absolutely out of the
Der Ansaugvorgang bei Vakuumdruckgießmaschinen kann als
erster Regelungsabschnitt durch Überfahren des Gießkolbens 7
über die Ansaug- oder Eintrittsöffnung 27 in die Gießkammer 6
oder durch einen entsprechend verminderten Unterdruck
(Druckanstieg) beendet werden. Er entspricht dem
Einfüllvorgang von Metallschmelze in eine "normale"
Druckgießvorrichtung. Hierfür kann die Stellung des
Gießkolbens 7 über einen Wegerfassungsgeber 31 dem Rechner 16
über eine Leitung 32 zugeführt werden, um insbesondere auch
bei "normalen" Gießkammern die Kolbenstellung nach Überfahren
der Einfüllöffnung 27 zu erfassen und das Vakuum zu regeln.
Sensoren zur Erfassung des Weges oder der Füllstandshöhe sind
an sich bekannt (s. z. B. Lit. Maschinenmarkt 1992, 40,
Seite 72 - 77).The suction process in vacuum die casting machines can be as
first control section by running over the casting piston 7
via the suction or inlet opening 27 into the
Diesem ersten Einfüllzeitabschnitt t1 schließt sich ein weiterer "Haltezeitabschnitt" t2 an.This first filling period t 1 is followed by a further “holding period” t 2 .
Durch ein Halten bestimmter Unterdrücke kann das Ausgasen der
Schmelze in der Gießkammer 6 und das Formevakuieren
begünstigt werden. Hierfür wird über einen Zeitabschnitt t2
nach einem kontinuierlichen Abfall des Unterdrucks
(Druckanstieg) auf ein Vakuum von vorzugsweise p2 ∼ 800 mbar
absolut eine bestimmte Haltezeit des Vakuums von t2 ∼ 0,2
bis 3 sec eingestellt. Diese Haltezeit kann sich je nach
spezifischem Metallgewicht, nach der Saugrohrhöhe h2 über
oder der Füllstandshöhe h1 in der Gießkammer und der
Formkontur bemessen. Durch diesen zwischenzeitlichen
Haltevorgang des Unterdruckes kann das Austreten der Gase aus
der Schmelze, der Gießkammer und den Formhohlräumen gefördert
und geregelt werden.By keeping certain negative pressures, the outgassing of the melt in the
Die Erfindung sieht weiterhin vor, daß
beim Übertritt der Schmelze 8 aus dem
Saugrohr 9 in die Gießkammer 6 an der Eintrittsöffnung 27 der
Gießkammer eine stetige Schmelzegeschwindigkeit
Das Befüllen der Gießform geschieht in an sich bekannter
Weise durch die Verschiebung des Kolbens 7 in der Gießkammer
6 in einer Vorfüll- und Formfüllphase. Während der
Formfüllphase dient die Regelung des Unterdrucks über diesen
dritten Zeitabschnitt t3 zur Absaugung der restlichen Luft- oder
Gasanteile.The casting mold is filled in a manner known per se by the displacement of the piston 7 in the
Claims (13)
- Method of controlling a vacuum in a diecasting and, in particular, in a vacuum diecasting machine for the production of gas-, pore- and oxide-depleted castings from metals and/or alloys thereof, wherein the casting mould (3, 4) and the casting chamber (6) are evacuated by means of a vacuum connecting valve (12, 13) on a casting mould (3, 4) and a casting chamber (6) which can be filled with molten metal (8), characterised in that the casting mould (3, 4) and the casting chamber (6) are evacuated via at least one control valve (13) in such a way that the vacuum p in the mould cavity (5) and in the casting chamber (6) is controlled according to a controllable curve
- Method according to claim 1, characterised in that the vacuum is controlled according to a progressive, linear or degressive pressure/time function
- Method according to claim 1 or 2, characterised in that the vacuum p is controlled as a function of the quantity m introduced into the casting chamber (6) and/or as a function of the casting plunger travel s.
- Method according to claim 1, 2 or 3, characterised in that the vacuum is controlled on a vacuum diecasting machine with a suction pipe (9) for aspirating molten metal (8) from a heat retention device (10).
- Method according to claim 4, characterised in that the vacuum p is controlled as a function of the time t and/or the quantity m and/or the casting plunger travel s in such a way that a continuous steady ascent of the melt (8) from the heat retention device (10) takes place in the suction pipe (9) and/or the casting chamber (6).
- Method according to one of the preceding claims 1 to 5, characterised in that the vacuum is kept at a high vacuum p1 ∼ 150 to 200 mbar in the first time slot t1 in order to fill the casting chamber and in that the melt is subsequently degassed in the casting chamber in a holding phase with a holding vacuum p2 ∼ 800 mbar over a second time slot t2.
- Method according to claim 6, characterised in that the holding vacuum p2 is kept at a specific predetermined value p2 for a time slot t2, such that degassing of the melt is substantially terminated.
- Method according to claim 6, characterised in that the holding vacuum p2 in the casting mould (5), the casting chamber (6) and/or in the suction pipe (9) is kept constant after a continuous drop to a vacuum of p2 of 200 to 800 mbar over a time slot t2 ∼ 0.2 - 3 sec such that gas issues from the melt.
- Method according to one or more of the preceding claims, characterised in that the vacuum p can be adjusted by means of vacuum control in such a way that a constant turbulence-free melt velocity v of
- Method according to one or more of the preceding claims, characterised in that, for detecting the vacuum, the vacuum connecting line (12) is allocated a vacuum measuring probe (18) which is connected to the vacuum connecting line (12) via a shunt valve (19).
- Method according to one or more of the preceding claims, characterised in that a computer (16) is provided in the vacuum connecting line (12) for controlling at least one on-off valve (13).
- Method according to one or more of the preceding claims, characterised in that the casting chamber (6) comprises a measuring device (28, 28') for the filling level of molten metal, for detecting the quantity, of which the measured value can be evaluated for vacuum control.
- Method according to one or more of the preceding claims, characterised in that the casting plunger is allocated a casting plunger travel detector (31) of which the measured value s can be supplied to the computer (16) via a measuring line (32) and in that control according to
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4239558 | 1992-11-25 | ||
| DE4239558A DE4239558A1 (en) | 1992-11-25 | 1992-11-25 | Process for producing negative pressure in a die casting machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0600324A1 EP0600324A1 (en) | 1994-06-08 |
| EP0600324B1 true EP0600324B1 (en) | 1999-06-16 |
Family
ID=6473581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93118695A Expired - Lifetime EP0600324B1 (en) | 1992-11-25 | 1993-11-20 | Method to generate low pressure in die casting machine |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0600324B1 (en) |
| DE (2) | DE4239558A1 (en) |
| ES (1) | ES2134820T3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8030082B2 (en) | 2006-01-13 | 2011-10-04 | Honeywell International Inc. | Liquid-particle analysis of metal materials |
Families Citing this family (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19628870A1 (en) * | 1996-07-17 | 1998-01-22 | Alusuisse Bayrisches Druckgus | Device and method for producing die-cast parts |
| DE59703386D1 (en) * | 1996-09-05 | 2001-05-23 | Electronics Gmbh | Die casting device and die casting method |
| DE19930624A1 (en) * | 1999-07-02 | 2001-01-11 | Geesthacht Gkss Forschung | Metal powder injection molding device used for molding metal or alloy powder, which may contain wax and/or polymer has its molding tool connected to vacuum pump |
| DE19941430A1 (en) * | 1999-08-30 | 2001-03-01 | Mueller Weingarten Maschf | Process for regulating the metal dosing quantity |
| DE10017393B4 (en) * | 2000-04-07 | 2008-04-30 | Volkswagen Ag | Process for the production of die castings and permanent molds |
| DE10022560A1 (en) * | 2000-05-10 | 2001-11-15 | Fuchs Lubritech Gmbh | Pressure casting machine comprises a two-part casting mold forming a casting chamber via a ventilating channel, and a pressure monitoring device connected to the ventilating channel and arranged between a valve and a filter |
| DE10045594B4 (en) * | 2000-09-15 | 2006-01-19 | Hansgrohe Ag | Method and device for casting hollow bodies |
| DE10054870B4 (en) * | 2000-11-06 | 2008-04-24 | Bühler Druckguss AG | die casting machine |
| DE10140657C1 (en) * | 2001-08-24 | 2002-11-07 | Mueller Weingarten Maschf | Device for measuring the pressures in a mold filled with a melt used in vacuum die casting machines comprises measuring channels arranged in direct contact with the hollow space of the mold |
| DE10144945B4 (en) * | 2001-09-12 | 2005-05-04 | Alcan Bdw Gmbh & Co. Kg | A method of controlling a vacuum valve of a vacuum die casting apparatus and vacuum die casting apparatus |
| DE10357365B4 (en) * | 2002-12-11 | 2007-05-03 | Metal Technologies Sachs Giesserei Gmbh | Die casting apparatus and method for die casting with a defined in-mold pressure |
| EP1524048B1 (en) * | 2003-10-15 | 2007-02-28 | Fondarex S.A. | Diecasting or injection moulding machine |
| DE102004057324A1 (en) * | 2004-11-27 | 2006-06-01 | Pfeiffer Vacuum Gmbh | Vacuum die casting process |
| DE102006010560A1 (en) * | 2006-03-06 | 2007-09-13 | Pfeiffer Vacuum Gmbh | Vacuum pressure casting plant and method of operation |
| DE102007012577A1 (en) | 2007-03-13 | 2008-09-18 | Bühler Druckguss AG | Process for venting molds |
| ITMI20101606A1 (en) * | 2010-09-06 | 2012-03-07 | Maicopresse Spa | IMPROVED DEVICE FOR FILLING MOLTED METAL IN PRESSING CHAMBERS IN DIE-CASTING MACHINES |
| JP5731922B2 (en) * | 2011-07-21 | 2015-06-10 | 本田技研工業株式会社 | Molten metal supply method and apparatus |
| DE102014113570B3 (en) | 2014-09-19 | 2015-12-24 | Ksm Castings Group Gmbh | Device for measuring pressures in a melt-fillable mold cavity of a casting mold, in particular a vacuum die casting mold |
| DE102016221678B4 (en) | 2016-11-04 | 2020-07-16 | Magna BDW technologies GmbH | Device for the production of die-cast parts |
| DE102016221674B4 (en) | 2016-11-04 | 2020-06-18 | Magna BDW technologies GmbH | Control for a device for the production of die-cast parts |
| EP3535078A2 (en) | 2016-11-04 | 2019-09-11 | MAGNA BDW technolgies GmbH | Device, control system and filter module for producing die-cast parts, and method therefor |
| CN107335789B (en) * | 2017-08-30 | 2023-06-16 | 鞍山海望真空设备制造有限公司 | Double independent system die casting high vacuum device |
| CN110076313B (en) * | 2019-05-05 | 2021-01-15 | 广东鸿图武汉压铸有限公司 | Die casting die based on integration of vacuum exhaust and natural exhaust |
| DE102023100621A1 (en) | 2023-01-12 | 2024-07-18 | Thomas Ninkel | Device for melt dosing on a die casting machine |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3009218A (en) * | 1958-10-22 | 1961-11-21 | David M Morgenstern | Apparatus for vacuum feeding a die casting machine |
| US4050503A (en) * | 1973-08-16 | 1977-09-27 | Institute Po Metaloznanie I Technologia Na Metalite | Apparatus for controlling the rate of filling of casting molds |
| DE3041340A1 (en) * | 1980-11-03 | 1982-05-13 | Maschinenfabrik Weingarten Ag, 7987 Weingarten | DIE CASTING METHOD FOR THE PRODUCTION OF LOW-GAS, LOW-PORENOUS AND LOW-OXYDOW CASTING PIECES, AND DIE CASTING MACHINE FOR IMPLEMENTING THE METHOD |
| KR950012481B1 (en) * | 1988-01-30 | 1995-10-18 | 도시바 기까이 가부시기가이샤 | Casting control system of die cast machine |
| JPH04123860A (en) * | 1990-09-14 | 1992-04-23 | Ryobi Ltd | Method and device for controlling degassing device in injection molding machine |
| DE4123463A1 (en) * | 1991-07-16 | 1993-01-21 | Audi Ag | METHOD FOR THE PRODUCTION OF CASTING PIECES BY MEANS OF A DIE CASTING MACHINE |
-
1992
- 1992-11-25 DE DE4239558A patent/DE4239558A1/en not_active Withdrawn
-
1993
- 1993-11-20 DE DE59309656T patent/DE59309656D1/en not_active Expired - Fee Related
- 1993-11-20 ES ES93118695T patent/ES2134820T3/en not_active Expired - Lifetime
- 1993-11-20 EP EP93118695A patent/EP0600324B1/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8030082B2 (en) | 2006-01-13 | 2011-10-04 | Honeywell International Inc. | Liquid-particle analysis of metal materials |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0600324A1 (en) | 1994-06-08 |
| DE59309656D1 (en) | 1999-07-22 |
| ES2134820T3 (en) | 1999-10-16 |
| DE4239558A1 (en) | 1994-05-26 |
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