EP1804985A1 - Method and device for the serial production of pistons for internal combustion engines by using the effect of gas pressure - Google Patents

Method and device for the serial production of pistons for internal combustion engines by using the effect of gas pressure

Info

Publication number
EP1804985A1
EP1804985A1 EP05801991A EP05801991A EP1804985A1 EP 1804985 A1 EP1804985 A1 EP 1804985A1 EP 05801991 A EP05801991 A EP 05801991A EP 05801991 A EP05801991 A EP 05801991A EP 1804985 A1 EP1804985 A1 EP 1804985A1
Authority
EP
European Patent Office
Prior art keywords
casting
melt
feeder
gas pressure
piston
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
EP05801991A
Other languages
German (de)
French (fr)
Other versions
EP1804985B1 (en
Inventor
Siegfried Mielke
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.)
KS Kolbenschmidt GmbH
Original Assignee
KS Kolbenschmidt GmbH
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 KS Kolbenschmidt GmbH filed Critical KS Kolbenschmidt GmbH
Publication of EP1804985A1 publication Critical patent/EP1804985A1/en
Application granted granted Critical
Publication of EP1804985B1 publication Critical patent/EP1804985B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/088—Feeder heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/14—Casting in, on, or around objects which form part of the product the objects being filamentary or particulate in form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
    • B22D23/02—Top casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
    • B22D27/13—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of gas pressure

Definitions

  • the invention relates to a method and a device for series production of a piston for internal combustion engines according to the features of the preamble of patent claim 1.
  • casting tools which represent a negative mold for the piston blank to be produced and which are filled via a feed system with casting melt.
  • These are usually multi-part tools, consisting of two outer mold halves, a one- or multi-part core, which determines the small connecting rod eye facing inner contour of the piston and a casting bottom with a central feeder, the lings facing the combustion chamber surface of Kolbenroh ⁇ defined in the raw state. While the core and the outer mold halves remain close to one another even after the casting tool has been opened, the pouring tray is moved far away, sometimes up to two meters away from the casting tool, in order to improve access during the removal of the piston blank.
  • the inner surface of the feeder is usually lined with thermally highly insulating material.
  • the feeder which is likewise filled with molten casting, is to be kept liquid until complete solidification of the casting in order to provide sufficient melt for the make-up to compensate for the volume contraction during solidification.
  • the volume decreases by several percent. Since metal-free spaces (blowholes) must be avoided in the product in any case, the feeder is so angeord ⁇ net that z. B. due to gravity melt can flow out of it in the direction of the piston blank.
  • the invention is therefore based on the object of specifying a method for series production of a piston for internal combustion engines, with which the quality of the piston can be increased significantly er ⁇ .
  • the opening of the feeder in particular of the end of the feeder sleeve which is open at the top, is acted on by a gas pressure acting on the casting melt.
  • Casting floor with collar feeder is used. Exploited here is the large sealing surface between the mouth of the feeder and the piston, represented by the collar and the fact that the mouthpiece of the feeder sleeve conforms under internal pressure to the inner wall of the feeder collar and thereby safely separates the pressure chamber from the atmosphere.
  • a gas pressure is passed, which is supplied for example by a pressure line for a gas, such as nitrogen.
  • the casting melt filled into the chill casting tool is subjected to the gas pressure via the feeder sleeve before it solidifies and / or after the partial solidification of the casting melt.
  • the pressure line during the filling of the Kolbeng mantechnikmaschines with the molten casting is open to the environment.
  • the time at which the gas pressure is applied may vary and vary according to specifiable criteria.
  • the gas pressure is generated already after filling but before solidification of the casting melt. At this very early selected pressure load of the casting melt affects the Gas pressure almost on all areas of the filled G hasslescrimelze in the Kolbeng mantechnik ⁇ convincing, so that the hub structure of the piston blank can also have an effect.
  • the areas of the piston blank which are further away from the feeder sleeve can be influenced in a targeted manner in their structure, whereby, however, care must be taken to ensure that the piston mold closes very well and tightly and the gate must solidify very early, so that the gas pressure can actually rise the pourable melt present in the piston casting tool can have an effect and it is prevented that molten casting can pass outwardly from the piston casting tool as a result of the pressurization.
  • the solidification under gas pressure is known to lead to a very dense, ie almost completely void-free structure, since the volume deficit during solidification is made more secure by the acting gas pressure. While in normal chill casting only the hydrostatic pressure generated by the feeder acts, the gas pressure is added here.
  • a preferred embodiment of the invention can be seen in the fact that after filling the piston casting tool, the formation of an edge shell a solidified casting melt is waited for.
  • This edge shell made of solidified foundry melt has the advantage that thereby the gas pressure acting on the not yet solidified foundry melt is separated from the environment and thus prevents casting melt from escaping from the piston casting tool.
  • the cast melt will be added during the filling into the piston casting tool and / or after the partial solidification.
  • the addition of fiber material has the advantage that all or only certain Regions of the piston blank are reinforced by the addition of the fiber material, which is particularly advantageous that the fiber material is supplied only from a time after a peripheral shell has formed from solidified casting melt. If, for example, the bowl rim and / or the ring field of the later piston is to be reinforced with the fibers, the solidification of the filled casting melt in the hub area should also be awaited.
  • Reference numeral 1 designates a casting tool that, depending on the geometric design of the piston to be produced, consists of a plurality of molds (partial molds). These parts; of the casting tool 1 are shown here only schematically, so that it is, for example, a core 2 for the interior and a core 3 for the bolt hole.
  • the üb ⁇ rige, outer mold (or casting halves) are present, but not further described here be ⁇ .
  • casting melt is introduced into the casting mold 1 via a feed device, so that the free areas around the cores and casting molds are filled with molten casting.
  • a wall or collar 4 is formed around the feeder which holds the feeder contents in position when the casting tool is opened to realize short cycle times according to the method at a time at which the contents of the "collar feeder” 5
  • a peripheral edge 4 is formed on which a collar feeder 5 can be placed.
  • the casting melt 6 can rise to a desired level, so that above the filled casting melt 6 after the completion of the feed of casting melt within the collar feeder 5, a free space is created via which the casting melt is subjected to a gas pressure ,
  • the gas for this purpose is supplied via a pressure line 7, which is open during the filling process of the casting melt relative to the environment, so that a pressure equalization can take place.
  • a gas pressure is generated by suitable means, the then can act on the melt surface in the collar feeder 5 via the pressure line 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

The invention relates to a method for serially producing a piston, in which a casting melt is filled into a multipiece casting mold and at least one feeder via a delivery zone. According to the invention, the opening of the end of the feeder shell that is open at the top is impinged upon by a gas pressure which acts upon the casting melt after casting the piston blank. The tightness of the feeder is ensured by using a collar-type feeder.

Description

Verfahren und Vorrichtung zur Serienherstellung von Kolben für Brennkraftmaschi¬ nen unter GasdruckeinwirkungMethod and device for series production of pistons for internal combustion engines under the effect of gas pressure
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Serienherstellung eines Kol¬ bens für Brennkraftmaschinen gemäß den Merkmalen des Oberbegriffes des Patentanspru¬ ches 1.The invention relates to a method and a device for series production of a piston for internal combustion engines according to the features of the preamble of patent claim 1.
Bei der Serienproduktion von Kolben sind Maschinen mit Gießwerkzeugen bekannt, die eine Negativform für den herzustellenden Kolbenrohling darstellen und die über ein Zulaufsystem mit Gießschmelze befüllt werden. Es handelt sich in der Regel um mehrteilige Werkzeuge, bestehend aus zwei Außenkokillenhälften, einem ein- oder mehrteiligen Kern, welcher die zum kleinen Pleuelauge weisende Innenkontur des Kolbens festlegt und einem Gießboden mit einem zentralen Speiser, der die zum Brennraum weisende Oberfläche des Kolbenroh¬ lings im Rohzustand definiert. Während der Kern und die Außenkokillenhälften auch nach dem Öffnen des Gießwerkzeugs nah beieinander verbleiben, wird der Gießboden zur Ver¬ besserung der Zugangs bei der Entnahme des Kolbenrohlings weit weg, teilweise bis zu zwei Meter vom Gießwerkzeug fortbewegt. Die innere Oberfläche des Speisers ist in der Regel mit thermisch stark isolierendem Material ausgekleidet. Dadurch soll der ebenfalls mit Gießschmelze gefüllte Speiser bis zur vollständigen Erstarrung des Gussteils flüssig gehal¬ ten werden, um ausreichend Schmelze für die Nachspeisung zum Ausgleich der Volumen¬ kontraktion bei der Erstarrung bereitzustellen. Beim Übergang des Metalls vom flüssigen in den festen Zustand nimmt das Volumen um mehrere Prozent ab. Da metallfreie Räume (Lunker) im Produkt in jedem Fall vermieden werden müssen, wird der Speiser so angeord¬ net, dass z. B. aufgrund der Schwerkraft Schmelze aus ihm in Richtung des Kolbenrohlings nachfließen kann.In the series production of pistons machines are known with casting tools, which represent a negative mold for the piston blank to be produced and which are filled via a feed system with casting melt. These are usually multi-part tools, consisting of two outer mold halves, a one- or multi-part core, which determines the small connecting rod eye facing inner contour of the piston and a casting bottom with a central feeder, the lings facing the combustion chamber surface of Kolbenroh¬ defined in the raw state. While the core and the outer mold halves remain close to one another even after the casting tool has been opened, the pouring tray is moved far away, sometimes up to two meters away from the casting tool, in order to improve access during the removal of the piston blank. The inner surface of the feeder is usually lined with thermally highly insulating material. As a result, the feeder, which is likewise filled with molten casting, is to be kept liquid until complete solidification of the casting in order to provide sufficient melt for the make-up to compensate for the volume contraction during solidification. During the transition of the metal from the liquid to the solid state, the volume decreases by several percent. Since metal-free spaces (blowholes) must be avoided in the product in any case, the feeder is so angeord¬ net that z. B. due to gravity melt can flow out of it in the direction of the piston blank.
Bei den bisherigen Herstellungsverfahren für die Serienproduktionen ist bekannt, dass nach dem Einfüllen der Gießschmelze in die Gießform eine ausreichend lange Zeit abgewartet wird, während der nicht nur die in die Gießform eingefüllte Gießschmelze vollständig erstarrt, sondern auch noch derjenige Teil der Gießschmelze, der sich im Speiser befindet. Erst wenn die Gießschmelze im Speiser erstarrt ist oder zumindest eine belastbare Randschale ausge¬ bildet hat, welche den noch flüssigen Speiserinhalt in Position halten kann, darf die im Re¬ gelfall mehrteilige Gießform geöffnet und der Kolbenrohling entnommen werden. Für diesen Zeitraum, dass heißt, vom Einfüllen der Gießschmelze in die Gießform bis zum Öffnen der Gießform (sogenannte Erstarrungszeit) sind je nach Größe des herzustellenden Kolbenroh¬ lings feste Zeiten vorgegeben. Erst nach Ablauf dieser Zeit und weiterer Zeiten, die nötig sind, um die Gießform für den nächsten Gießvorgang vorzubereiten, kann der folgende Gießvorgang beginnen.In the previous production processes for series production, it is known that after pouring the casting melt into the casting mold a sufficiently long time is waited for, during which not only the casting melt filled into the casting mold completely solidifies, but also that part of the casting melt, which is located in the feeder. Only when the casting melt has solidified in the feeder or has at least formed a loadable edge shell which can hold the still liquid feeder contents in position may the mold, which is multipartite, be opened and the piston blank removed. For this period, that is, from filling the casting melt into the casting mold until the mold is opened (so-called solidification time), fixed times are predetermined depending on the size of the piston blank to be produced. Only after expiration of this time and other times necessary to prepare the casting mold for the next casting operation can the subsequent casting operation begin.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zur Serienherstellung eines Kolbens für Brennkraftmaschinen anzugeben, mit dem die Qualität des Kolbens deutlich er¬ höht werden kann.The invention is therefore based on the object of specifying a method for series production of a piston for internal combustion engines, with which the quality of the piston can be increased significantly er¬.
Diese Aufgabe ist durch die Merkmale des Patentanspruches 1 gelöst.This object is solved by the features of claim 1.
Erfindungsgemäss ist vorgesehen, dass nach dem Gießen des Kolbenrohlings die Öffnung des Speisers, insbesondere des nach oben hin offenen Endes der Speiserhülse, mit einem auf die Gießschmelze wirkenden Gasdruck beaufschlagt wird. Dies hat den Vorteil, dass der schon bekannte und sich bei der Serienherstellung von Kolben bewährte Kokillenguss mit den Vorteilen des Squeeze Casting Verfahrens verbunden wird, bei welchem das Gefüge der Gießschmelze unter Druck erstarrt. Einen besonders stabilen Prozess erhält man, wenn ausgehend von einem an sich bekannten Kokillengusswerkzeug (Kolbengießwerkzeug) einAccording to the invention, it is provided that after the casting of the piston blank, the opening of the feeder, in particular of the end of the feeder sleeve which is open at the top, is acted on by a gas pressure acting on the casting melt. This has the advantage that the previously known and proven in the mass production of piston chill casting is associated with the advantages of the squeeze casting process, in which the structure of the casting melt solidifies under pressure. A particularly stable process is obtained if, starting from a per se known Kokillengusswerkzeug (piston casting tool) a
Gießboden mit Kragenspeiser verwendet wird. Ausgenutzt wird hierbei die große Dichtfläche zwischen dem Mundstück des Speisers und dem Kolben, dargestellt durch den Kragen und die Tatsache, dass sich das Mundstück der Speiserhülse unter Innendruck an die Innenwand des Speiserkragens anschmiegt und dadurch den Druckraum sicher von der Atmosphäre trennt. In die Öffnung des nach oben hin offenen Endes der Speiserhülse wird ein Gasdruck geleitet, der beispielsweise durch eine Druckleitung für ein Gas, wie beispielsweise Stick- stoff, zugeführt ist. Die in das Kokillengusswerkzeug eingefüllte Gießschmelze wird nach dem Füllen vor dem Erstarren und/oder auch nach dem teilweise Erstarren der Gießschmel¬ ze mit dem Gasdruck über die Speiserhülse beaufschlagt. Dabei ist vorgesehen, dass die Druckleitung während des Füllvorganges des Kolbengießwerkzeuges mit der Gießschmelze zur Umgebung hin offen ist. Der Zeitpunkt, zu dem die Gasdruckbeaufschlagung erfolgt, kann variabel und anhand vorgebbarer Kriterien variieren. So ist einerseits vorgesehen, dass der Gasdruck schon nach dem Füllen, aber noch vor dem Erstarren der Gießschmelze er¬ zeugt wird. Bei dieser sehr früh gewählten Druckbelastung der Gießschmelze wirkt sich der Gasdruck nahezu auf alle Bereiche der eingefüllten Gießscrimelze in dem Kolbengießwerk¬ zeug aus, so dass auch das Nabengefüge des Kolbenrohlings eine Wirkung erfahren kann. Damit können auch die weiter von der Speiserhülse entfernten Bereiche des Kolbenrohlings in ihrem Gefüge gezielt beeinflußt werden, wobei jedoch darauf zu achten ist, dass das KoI- bengießwerkzeug sehr gut und dicht schließt und der Anguß sehr früh erstarren muss, damit der Gasdruck auch tatsächtlich auf die sich in dem Kolbengießwerkzeug befindliche Gie߬ schmelze auswirken kann und verhindert wird, dass Gießschmelze durch die Druckbeauf¬ schlagung nach außen des Kolbengießwerkzeuges gelangen kann. Das Erstarren unter Gasdruck führt bekanntermaßen zu einem sehr dichten d.h. fast völlig lunkerfreiem Gefüge, da das Volumendefizit bei der Erstarrung durch den wirkenden Gasdruck sicherer ausgegli¬ chen wird. Während beim normalen Kokillenguss nur der hydrostatische Druck, der vom Speiser erzeugt wird, wirkt, addiert sich hier der Gasdruck hinzu. Bei reinem Schwerkraft- guss ergibt sich der Druck, der die Schmelze an die Erstarrungsfront treibt, aus dem hydro¬ statischen Druck einer Schmelzensäule von 200 bis 50 mm. Im Laufe der Erstarrung verrin- gert sich die wirksame Höhe, da die Erstarrungsfront sich auf die Oberfläche des Speisers zu bewegt. Bei zusätzlicher Beaufschlagung mit Gasdruck entspricht jedes bar Druck einer zusätzlichen Höhe an Metallsäule von rund 3 m. Da schon geringe Änderungen der Spei¬ serhöhe zu einer besseren Qualität führen, kommt es schon bei geringer zusätzlicher Druckbeaufschlagung zu einer massiven Steigerung der Homogenität des Gussteiles.Casting floor with collar feeder is used. Exploited here is the large sealing surface between the mouth of the feeder and the piston, represented by the collar and the fact that the mouthpiece of the feeder sleeve conforms under internal pressure to the inner wall of the feeder collar and thereby safely separates the pressure chamber from the atmosphere. In the opening of the upwardly open end of the feeder sleeve, a gas pressure is passed, which is supplied for example by a pressure line for a gas, such as nitrogen. The casting melt filled into the chill casting tool is subjected to the gas pressure via the feeder sleeve before it solidifies and / or after the partial solidification of the casting melt. It is provided that the pressure line during the filling of the Kolbengießwerkzeuges with the molten casting is open to the environment. The time at which the gas pressure is applied may vary and vary according to specifiable criteria. On the one hand, it is provided that the gas pressure is generated already after filling but before solidification of the casting melt. At this very early selected pressure load of the casting melt affects the Gas pressure almost on all areas of the filled Gießscrimelze in the Kolbengießwerk¬ convincing, so that the hub structure of the piston blank can also have an effect. In this way, the areas of the piston blank which are further away from the feeder sleeve can be influenced in a targeted manner in their structure, whereby, however, care must be taken to ensure that the piston mold closes very well and tightly and the gate must solidify very early, so that the gas pressure can actually rise the pourable melt present in the piston casting tool can have an effect and it is prevented that molten casting can pass outwardly from the piston casting tool as a result of the pressurization. The solidification under gas pressure is known to lead to a very dense, ie almost completely void-free structure, since the volume deficit during solidification is made more secure by the acting gas pressure. While in normal chill casting only the hydrostatic pressure generated by the feeder acts, the gas pressure is added here. In pure gravity casting, the pressure which drives the melt to the solidification front results from the hydrostatic pressure of a melt column of 200 to 50 mm. In the course of solidification, the effective height decreases as the solidification front moves towards the surface of the feeder. With additional application of gas pressure, each bar pressure corresponds to an additional height of metal column of about 3 m. Since even small changes in the Spei¬ serhöhe lead to a better quality, it comes even at low additional pressurization to a massive increase in the homogeneity of the casting.
Eine bevorzugte Ausführung der Erfindung ist darin zu sehen, dass nach dem Füllen des Kolbengießwerkzeuges die Ausbildung einer Randschale a us erstarrter Gießschmelze ab¬ gewartet wird. Diese Randschale aus erstarrter Gießschmelze hat den Vorteil, dass dadurch der auf die noch nicht erstarrte Gießschmelze wirkende Gasdruck von der Umgebung ge- trennt wird und damit verhindert wird, dass Gießschmelze aus dem Kolbengießwerkzeug austreten kann.A preferred embodiment of the invention can be seen in the fact that after filling the piston casting tool, the formation of an edge shell a solidified casting melt is waited for. This edge shell made of solidified foundry melt has the advantage that thereby the gas pressure acting on the not yet solidified foundry melt is separated from the environment and thus prevents casting melt from escaping from the piston casting tool.
Bei den beschriebenen Verfahrensschritten mit der Beaufschlagung der Gießschmelze mit Gasdruck ist es möglich, die Druckbeaufschlagung über die> gesamte Zeitdauer konstant zu halten oder alternativ zu regeln, wobei es besonders vorteilhaft ist, im Zeitraum zwischen Beginn und Ende der Druckbeaufschlagung den Gasdruck zu steigern, so dass mit zuneh¬ mender Erstarrung der Druck erhöht wird, um ein gleichmässiges Gefüge der erstarrenden Gießschmelze zu erhalten.In the described method steps with the admission of the casting melt with gas pressure, it is possible to keep the pressurization constant over the entire period of time or alternatively to regulate, wherein it is particularly advantageous to increase the gas pressure in the period between the beginning and end of the pressurization, so that the pressure is increased with increasing solidification in order to obtain a uniform structure of the solidifying casting melt.
Weiterhin ist vorgesehen, dass der Gießschmelze während des Einfüllens in das Kolben¬ gießwerkzeug und/oder nach dem teilweise Erstarren hitzet>eständiges Fasermaterial beige¬ geben wird. Die Beifügung von Fasermaterial hat den Vorteil, dass alle oder nur bestimmte Bereiche des Kolbenrohlings durch die Beigabe des Fasermaterials verstärkt werden, wozu besonders vorteilhaft ist, dass das Fasermaterial erst ab einem Zeitpunkt zugeführt wird, nachdem sich eine Randschale aus erstarrter Gießschmelze gebildet hat. Soll zum Beispiel gezielt der Muldenrand und / oder das Ringfeld des späteren Kolbens mit den Fasern ver- stärkt werden, sollte auch die Erstarrung der eingefüllten Gießschmelze im Nabenbereich abgewartet werden.Furthermore, it is provided that the cast melt will be added during the filling into the piston casting tool and / or after the partial solidification. The addition of fiber material has the advantage that all or only certain Regions of the piston blank are reinforced by the addition of the fiber material, which is particularly advantageous that the fiber material is supplied only from a time after a peripheral shell has formed from solidified casting melt. If, for example, the bowl rim and / or the ring field of the later piston is to be reinforced with the fibers, the solidification of the filled casting melt in the hub area should also be awaited.
Abschließend sei noch darauf hingewiesen, dass zur Verbesserung der Dichtigkeit der Spei¬ serhülse diese mittels des Gasdruckes und / oder gegebenenfalls weiterer Mittel gegen den Kolbenboden und in den Speiserkragen zu pressen. Als weitere Mittel kommen hier zum Beispiel hydraulisch wirkende Aktuatoren in Betracht.Finally, it should be pointed out that in order to improve the tightness of the Spei¬ serhülse these press by means of the gas pressure and / or optionally other means against the piston head and in the feeder collar. As a further means come here, for example, hydraulically acting actuators into consideration.
In der Figur wird wie folgt ein Ausführungsbeispiel der Erfindung dargestellt und beschrei¬ ben, wobei das erfindungsgemässe Verfahren nicht auf dieses Ausführungsbeispiel be- schränkt ist.In the figure, an embodiment of the invention is shown and described as follows, wherein the inventive method is not limited to this embodiment.
Mit der Bezugsziffer 1 ist ein Gießwerkzeug bezeichnet, dass je nach geometrischer Gestal¬ tung des herzustellenden Kolbens aus mehreren Formen (Teilformen) besteht. Diese Teile; des Gießwerkzeuges 1 sind hier nur schematisch dargestellt, so dass es sich beispielsweise um einen Kern 2 für den Innenbereich und einen Kern 3 für das Bolzenloch handelt. Die üb¬ rige, äußere Gießform (oder auch Gießhälften) sind vorhanden, hier aber nicht weiter be¬ schrieben. In an sich bekannter Weise wird über eine Zuführeinrichtung Gießschmelze in das Gießwerkzeug 1 eingefüllt, so dass sich die freien Bereiche um die Kerne und Gießfor¬ men herum mit Gießschmelze auffüllen. Durch eine spezielle Ausgestaltung von Gießboden und Speiserhülse bildet sich um den Speiser ein Wall oder Kragen 4 der den Speiserinhalt in Position hält, wenn das Gießwerkzeug zur Realisierung kurzer Zykluszeiten verfahrensge¬ mäß zu einem Zeitpunkt geöffnet wird, bei dem der Inhalt des „Kragenspeisers" 5 noch flüs¬ sig ist. Dabei bildet sich ein umlaufender Rand 4, auf den ein Kragenspeiser 5 aufsetzbar ist.Reference numeral 1 designates a casting tool that, depending on the geometric design of the piston to be produced, consists of a plurality of molds (partial molds). These parts; of the casting tool 1 are shown here only schematically, so that it is, for example, a core 2 for the interior and a core 3 for the bolt hole. The üb¬ rige, outer mold (or casting halves) are present, but not further described here be¬. In a manner known per se, casting melt is introduced into the casting mold 1 via a feed device, so that the free areas around the cores and casting molds are filled with molten casting. By means of a special embodiment of the pouring bottom and the feeder sleeve, a wall or collar 4 is formed around the feeder which holds the feeder contents in position when the casting tool is opened to realize short cycle times according to the method at a time at which the contents of the "collar feeder" 5 In this case, a peripheral edge 4 is formed on which a collar feeder 5 can be placed.
Innerhalb des Kragenspeisers 5 kann die Gießschmelze 6 bis auf ein gewünschtes Maß an¬ steigen, so dass oberhalb der eingefüllten Gießschmelze 6 nach dem Beenden der Zufüh¬ rung von Gießschmelze innerhalb des Kragenspeisers 5 ein Freiraum entsteht, über den die Gießschmelze mit einem Gasdruck beaufschlagt wird. Das Gas hierfür wird über eine Druck- leitung 7 zugeführt, die während des Einfüllvorganges der Gießschmelze gegenüber der Umgebung hin offen ist, so dass ein Druckausgleich stattfinden kann. Nach Beendigung des Einfüllvorganges der Gießschmelze wird mit geeigneten Mitteln ein Gasdruck erzeugt, der dann über die Druckleitung 7 auf die Schmelzenoberfläche im Kragenspeisers 5 wirken kann. Within the collar feeder 5, the casting melt 6 can rise to a desired level, so that above the filled casting melt 6 after the completion of the feed of casting melt within the collar feeder 5, a free space is created via which the casting melt is subjected to a gas pressure , The gas for this purpose is supplied via a pressure line 7, which is open during the filling process of the casting melt relative to the environment, so that a pressure equalization can take place. After completion of the filling process of the casting melt, a gas pressure is generated by suitable means, the then can act on the melt surface in the collar feeder 5 via the pressure line 7.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1. Gießwerkzeug1. casting tool
2. Kern 3. Kern2nd core 3rd core
4. Kragen des Speisers4. collar of the feeder
5. Kragenspeiser5. Collar feeder
6. Gießschmelze6. casting melt
7. Druckleitung 7. pressure line

Claims

P A T E N T A N S P R Ü C H E 1.P A T E N T A N S P R E C H E 1.
Vorrichtung zur Serienherstellung eines Kolbens, wobei eine Gießschmelze über einen Zu¬ führbereich in eine mehrteilige Gießform und zumindest einen Speiser einfüllbar ist, da¬ durch gekennzeichnet, dass der Speiser ein nach oben hin offenes Ende aufweist, wobei die Gießschmelze über diese Öffnung mit einem Gasdruck beaufschlagbar ist.Apparatus for mass-producing a piston, wherein a casting melt can be introduced into a multi-part casting mold and at least one feeder via an inlet region, characterized in that the feeder has an open end, the casting melt having a gas pressure via this opening can be acted upon.
2.Second
Verfahren zur Serienherstellung eines Kolbens, wobei eine Gießschmelze über einen Zu¬ führbereich in eine mehrteilige Gießform und zumindest einen Speiser befüllt wird, gekenn¬ zeichnet durch die Verwendung eines Speisers gemäß Patentanspruch 1.A method for series production of a piston, wherein a casting melt is filled via a feed region into a multi-part casting mold and at least one feeder, characterized by the use of a feeder according to claim 1.
3.Third
Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass der Gasdruck nach dem Füllen des Kolbengießwerkzeuges vor dem Erstarren der Gießschmelze erzeugt wird.A method according to claim 2, characterized in that the gas pressure is generated after the filling of the Kolbengießwerkzeuges before the solidification of the casting melt.
4.4th
Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass der Gasdruck nach dem Füllen des Kolbengießwerkzeuges und nach dem teilweisen Erstarren der Gießschmelze erzeugt wird.A method according to claim 2, characterized in that the gas pressure is generated after filling the Kolbengießwerkzeuges and after the partial solidification of the casting melt.
5.5th
Verfahren nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass nach dem Füllen des Kolbengießwerkzeuges die Ausbildung einer Randschale aus erstarrter Gie߬ schmelze abgewartet wird.Method according to one of claims 2 to 4, characterized in that after filling the Kolbengießwerkzeuges the formation of an edge shell of solidified Gie߬ melt is awaited.
6.6th
Verfahren nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, dass der Gie߬ schmelze während des Einfüllens in das Kolbengießwerkzeug und/oder nach dem teilweise Erstarren hitzebeständiges Fasermaterial beigegeben wird. Method according to one of claims 2 to 5, characterized in that the Gie߬ melt is added during the filling in the Kolbengießwerkzeug and / or after the partial solidification heat-resistant fiber material.
EP05801991A 2004-10-27 2005-10-25 Method and device for the serial production of pistons for internal combustion engines by using the effect of gas pressure Not-in-force EP1804985B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004052231A DE102004052231A1 (en) 2004-10-27 2004-10-27 Method for series production of pistons for internal combustion engines under gas pressure
PCT/EP2005/011438 WO2006045589A1 (en) 2004-10-27 2005-10-25 Method and device for the serial production of pistons for internal combustion engines by using the effect of gas pressure

Publications (2)

Publication Number Publication Date
EP1804985A1 true EP1804985A1 (en) 2007-07-11
EP1804985B1 EP1804985B1 (en) 2009-06-24

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EP (1) EP1804985B1 (en)
AT (1) ATE434498T1 (en)
DE (2) DE102004052231A1 (en)
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DE202022104611U1 (en) 2022-08-15 2022-08-22 Demin Srm Gmbh Feeder for iron and steel casting

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DE502005007586D1 (en) 2009-08-06
WO2006045589A1 (en) 2006-05-04
ATE434498T1 (en) 2009-07-15
EP1804985B1 (en) 2009-06-24
DE102004052231A1 (en) 2006-05-11

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