EP1954424A1 - One-part steel piston as a precision-casting variant with a core for the precision-casting production of a cooling channel - Google Patents

One-part steel piston as a precision-casting variant with a core for the precision-casting production of a cooling channel

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Publication number
EP1954424A1
EP1954424A1 EP06818435A EP06818435A EP1954424A1 EP 1954424 A1 EP1954424 A1 EP 1954424A1 EP 06818435 A EP06818435 A EP 06818435A EP 06818435 A EP06818435 A EP 06818435A EP 1954424 A1 EP1954424 A1 EP 1954424A1
Authority
EP
European Patent Office
Prior art keywords
casting
cooling channel
steel piston
precision
core
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
EP06818435A
Other languages
German (de)
French (fr)
Other versions
EP1954424B1 (en
Inventor
Andreas Rehl
Hans-Joachim Weimar
Emmerich Ottliczky
Volker Gniesmer
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
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Filing date
Publication date
Application filed by KS Kolbenschmidt GmbH filed Critical KS Kolbenschmidt GmbH
Publication of EP1954424A1 publication Critical patent/EP1954424A1/en
Application granted granted Critical
Publication of EP1954424B1 publication Critical patent/EP1954424B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F2200/00—Manufacturing
    • F02F2200/06—Casting

Definitions

  • One-piece steel piston as precision casting variant with core for the machining of a cooling channel
  • the invention relates to a method for producing a one-piece steel piston for an internal combustion engine of a passenger car and a steel piston produced by this method according to the features of the preamble of claim 1.
  • one-piece steel pistons with a closed cooling channel are already known, which are manufactured in the sand casting process.
  • the wall thicknesses in the sand casting method and die casting are significantly higher than in cast iron, so that a lightweight construction desired in the passenger car sector can not be achieved.
  • the invention is therefore based on the object to provide a steel piston in particular for the operation of high-speed and high-pressure diesel engines, which meets the above-mentioned parameters, in particular lowered the exhaust emissions during operation of the piston and at the same time with a performance increase lower consumption of the engine is achieved, whereby the production costs for such a steel piston are to be considered.
  • a manufacturing method in which the casting method is a precision casting method and the casting mold and the lost core are designed such that at least two or more closable openings are formed in the cooling channel after the casting mold and the lost core have been removed.
  • This initially has the advantage that, on the one hand, a higher-strength material, in particular steel, is used and, on the other hand, the cooling channel, in particular its cross-section, is increased.
  • the larger surface of the cooling channel increases the heat dissipation and reduces the heat load of the critical areas on the steel piston, in particular in the region of the piston crown.
  • the mechanical properties of the steel and the greater potential of the investment casting process counteract the design freedom of the increased load.
  • the novelty of the invention relates to the realization of a one-piece steel piston of a highly loaded, future-oriented steel piston for the operation of fast-running high-pressure diesel engines, which is manufactured by investment casting and in which, if necessary, the closing of the cooling channel can be done, but not
  • a core in particular a core of high-temperature-resistant materials, in particular a ceramic core, which can be easily and quickly produced in accordance with the present invention.
  • ing invention can be removed from the cast steel piston.
  • the invention relates to a cast one-piece steel piston, in which the removal of the core for the cooling channel, in particular of the ceramic core, is done in an economical manner, in particular leads to a cost reduction.
  • a plurality of openings with any sufficient cross-section in particular kidney-shaped or similar openings with a sufficient cross section, are provided in the casting, which are closed form-fit or material-locking after the removal of the core.
  • the oil inlet or oil outlet bore can already be integrated by suitable manufacturing process in the occluding component.
  • the casting mold is designed to hold the lost core via sleeves or the like.
  • the entire steel piston can be poured very quickly and easily by precision casting, with just as quickly and easily the lost core can be removed after the solidification of the casting melt.
  • the casting mold consists of a heat-resistant wax material.
  • This wax material has, among other suitable materials for the casting mold the advantage that the subsequent, that is, after casting resulting outer contour of the steel piston is very accurate and corresponds to the later external dimensions, so that the subsequent step of finishing is less expensive than when using other materials for the mold.
  • the two figures 1 and 2 show on the one hand a section through a one-piece steel piston 1, and on the other hand, a three-dimensional view of such a piston, which has been produced by investment casting. It can be seen that in the piston head 2, in particular behind a ring field 3 with a plurality of annular grooves and a combustion bowl 4, a preferably radially encircling cooling channel 5 is present, by means of a core, in particular a sand-, ceramic- and / or fibrous core, has been produced.
  • the piston 1 in a conventional manner piston shafts and bolt holes, the are arranged below the piston head 2.
  • Such an exemplary, but non-limiting embodiment is shown in Figures 1 and 2.
  • At least one closure part 6, in particular a plurality of closure parts 6, is provided, which have a round, oval, kidney or other geometric shape, which or after the casting of the piston 1 in the through the casting mold and the lost Core formed connection to the cooling channel 5 is (are) used.
  • these closure parts 6 are not used in all connections, so that then at least one oil inlet and at least one oil outlet hole or opening is available.
  • the cavity is not used for a circulating cooling medium, but for weight savings.
  • a negative mold which images the later outer contours of the piston blank to be cast, made of a heat-resistant, in particular a wax material.
  • the core material is fixed at a distance to these molds via pins, in particular wax pencils, quills or the like, and the negative mold is filled with molten casting. After solidification of the casting melt, the negative mold is removed, so that serve as inlet or outlet openings for the cooling channel to be removed pins, quills and the like. After these have been removed, as well as the core material, the at least one closure part is introduced into the opening to close the cooling channel.
  • the respective closure part can be non-positively and / or positively attached to the underside of the cooling channel or elsewhere, where the holder for the core material have been found attached.
  • the closure member 6 can be seen again, which is inserted into the opening, which is formed after the casting of the steel piston.
  • the casting when casting standing opening extends in an advantageous manner with respect to the piston stroke down, since from this direction usually the cooling medium (cooling oil) is injected.
  • the invention provides that the resulting during casting openings are present in the cooling channel 5 radially circumferentially at several points below the cooling channel 5, that means that such openings are only partially available. That is, the cooling channel 5 is closed at its bottom after casting, but two or more openings are present. These openings are used as inlet and outlet opening for the cooling medium. If more than two such openings are present, they can also serve as inlet or drain opening for the cooling medium.

Abstract

The invention relates to a method for producing a one-part steel piston of an internal combustion engine of a passenger car, the steel piston been produced in a casting process by using a casting mould forming the outer contours of the steel piston and finished after the casting, wherein a lost core is used to create a cooling channel, it being provided according to the invention that the casting process is a precision-casting process and the casting mould and the lost core are designed in such a way that at least two or more openings are formed in the cooling channel once the casting mould and the lost core have been removed.

Description

B E S C H R E I B U N G DESCRIPTION
Einteiliger Stahlkolben als Feinguss-Variante mit Kern für die feingusstechnische Herstellung eines KühlkanalesOne-piece steel piston as precision casting variant with core for the machining of a cooling channel
Die Erfindung betrifft ein Verfahren zur Herstellung eines einteiligen Stahlkolbens für eine Brennkraftmaschine eines Personenkraftwagens sowie einen nach diesem Verfahren hergestellten Stahlkolben gemäß den Merkmalen des Oberbegriffes des Patentanspruches 1.The invention relates to a method for producing a one-piece steel piston for an internal combustion engine of a passenger car and a steel piston produced by this method according to the features of the preamble of claim 1.
Bekannt sind Stahlkolben, die allerdings im Bereich von Nutzkraftfahrzeugen serienmäßig eingesetzt wurden, da hier das Gewicht von Stahlkolben keine so große Rolle spielt wie bei Verbrennungsmotoren mit dem gegenüber kleineren Kolben im Personenkraftwagenbereich. Bei den bekannten Stahlkolben wurde ein Kühlkanal im Kolbenboden (auch Kolbenkopf genannt) offen gestaltet, wobei das Verschließen des Kühlkanales durch ein zusätzliches ein- oder mehrteiliges Element, wie zum Beispiel ein geteilter Ring, mit Hilfe von diversen Verbindungstechniken wie zum Beispiel Laserschweißen durchgeführt wurde. Durch diese zusätzlichen Ferti- gungs- und Montageschritte entstehen in nachteiliger weise Mehrkosten.Steel pistons are known, however, which were used as standard in the field of commercial vehicles, since the weight of steel pistons does not play such a large role here as in internal combustion engines with respect to smaller pistons in the passenger car sector. In the known steel pistons, a cooling channel in the piston head (also called piston head) was designed to be open, wherein the closing of the cooling channel was performed by an additional one or more part element, such as a split ring, using various joining techniques such as laser welding. These additional production and assembly steps result in disadvantageous additional costs.
Dem gegenüber sind schon einteilige Stahlkolben mit geschlossenem Kühlkanal bekannt, die im Sandguss-Verfahren hergestellt werden. Die Wandstärken im Sand- guss-Gießverfahren und beim Kokillenguß sind jedoch deutlich höher als im Fein- guss, so dass sich ein im PKW-Bereich gewünschter Leichtbau nicht realisieren lässt.On the other hand, one-piece steel pistons with a closed cooling channel are already known, which are manufactured in the sand casting process. However, the wall thicknesses in the sand casting method and die casting are significantly higher than in cast iron, so that a lightweight construction desired in the passenger car sector can not be achieved.
Bei modernen Brennkraftmaschinen ist eine fortlaufende Leistungssteigerung gewünscht, bei der aufgrund immer strengerer Auflagen von Gesetzgebern bezüglich der Abgasemissionen diese Emissionen gesenkt, zum anderen auf Wunsch der Kunden nach leistungsstärkeren Aggregaten ein weiter geringerer Verbrauch zu erzielen ist. Zur Erfüllung zumindest dieser beiden Forderungen, die sich in der Praxis widersprechen, führt die Verringerung der Abgasemissionen einerseits und die Leistungssteigerung andererseits zu einer höheren thermischen und mechanischen Belastung des Kolbens für Dieselbrennkraftmaschinen. Diese Belastungen steigen mit den dann herrschenden Zünddrücken und Drehzahlen an.In modern internal combustion engines, a continuous increase in performance is desired, in which, due to ever stricter requirements of legislators with regard to exhaust emissions, these emissions reduced, on the other hand, at the request of customers for more powerful units, a further lower consumption achieve. To meet at least these two requirements, which contradict each other in practice, the reduction of exhaust emissions on the one hand and the increase in performance on the other hand leads to a higher thermal and mechanical load on the piston for diesel internal combustion engines. These loads increase with the then prevailing ignition pressures and speeds.
Der Erfindung liegt daher die Aufgabe zugrunde, einen Stahlkolben insbesondere für den Betrieb von schnell laufenden und hoch belasteten Dieselmotoren bereitzustellen, der die eingangs geschilderten Parameter erfüllt, bei dem insbesondere die Abgasemissionen im Betrieb des Kolbens gesenkt und gleichzeitig bei einer Leistungssteigerung ein geringerer Verbrauch der Brennkraftmaschine erzielt wird, wobei auch die Herstellungskosten für einen solchen Stahlkolben zu beachten sind.The invention is therefore based on the object to provide a steel piston in particular for the operation of high-speed and high-pressure diesel engines, which meets the above-mentioned parameters, in particular lowered the exhaust emissions during operation of the piston and at the same time with a performance increase lower consumption of the engine is achieved, whereby the production costs for such a steel piston are to be considered.
Diese Aufgabe ist durch die Merkmale des Patentanspruches 1 gelöstThis object is solved by the features of claim 1
Erfindungsgemäß ist ein Herstellungsverfahren vorgesehen, bei dem das Gießverfahren ein Feingussverfahren ist und die Gießform und der verlorene Kern so gestaltet sind, dass zumindest zwei oder mehr verschließbare Öffnungen in dem Kühlkanal entstehen, nachdem die Gießform und der verlorene Kern entfernt worden sind. Hierdurch bleibt zunächst der Vorteil bestehen, dass zum einen ein höher festerer Werkstoff, insbesondere Stahl, zum Einsatz kommt und zum anderen der Kühlkanal, insbesondere dessen Querschnitt, vergrößert wird. Die größere Oberfläche des Kühlkanales erhöht die Wärmeabfuhr und reduziert die Wärmebelastung der kritischen Bereiche am Stahlkolben, insbesondere im Bereich des Kolbenbodens. Die mechanischen Eigenschaften des Stahls und das größere Potenzial des Feinguss-Verfahrens, wirken bezüglich der Gestaltungsfreiheit der erhöhten Belastung entgegen. Damit bezieht sich die Neuheit der Erfindung auf die Realisierung eines einteiligen Stahlkolbens eines hoch belasteten, zukunftsorientierten Stahlkolbens für den Betrieb von schnell laufenden hoch belasteten Dieselmotoren, der im Feinguss-Verfahren hergestellt wird und bei dem ggfs. das Verschließen des Kühlkanals erfolgen kann, aber nicht muß.. Insbesondere geht es um einen Kern, vor allen Dingen einen Kern aus hochtemperaturfesten Werkstoffen, insbesondere einen Keramikkern, der auf einfache und schnelle Art und Weise gemäß der vorlie- genden Erfindung aus dem gegossenen Stahlkolben entfernt werden kann. Damit betrifft die Erfindung einen gegossenen einteiligen Stahlkolben, bei dem das Entfernen des Kernes für den Kühlkanal, insbesondere des Keramikkerns, auf eine wirtschaftliche Art und Weise geschieht, insbesondere die zu einer Kostenreduzierung führt. Hierzu werden mehrere Öffnungen mit beliebigem ausreichendem Querschnitt, insbesondere nierenförmige oder ähnliche Öffnungen mit einem ausreichenden Querschnitt, in dem Gussteil vorgesehen, die nach dem Entfernen des Kerns form- oder stoffschlüssig verschlossen werden. Dabei kann in dem verschließenden Bauteil bereits die öleintritts- bzw. ölaustrittsbohrung durch geeignetes Fertigungsverfahren integriert sein.According to the invention, a manufacturing method is provided in which the casting method is a precision casting method and the casting mold and the lost core are designed such that at least two or more closable openings are formed in the cooling channel after the casting mold and the lost core have been removed. This initially has the advantage that, on the one hand, a higher-strength material, in particular steel, is used and, on the other hand, the cooling channel, in particular its cross-section, is increased. The larger surface of the cooling channel increases the heat dissipation and reduces the heat load of the critical areas on the steel piston, in particular in the region of the piston crown. The mechanical properties of the steel and the greater potential of the investment casting process counteract the design freedom of the increased load. Thus, the novelty of the invention relates to the realization of a one-piece steel piston of a highly loaded, future-oriented steel piston for the operation of fast-running high-pressure diesel engines, which is manufactured by investment casting and in which, if necessary, the closing of the cooling channel can be done, but not In particular, it is a question of a core, in particular a core of high-temperature-resistant materials, in particular a ceramic core, which can be easily and quickly produced in accordance with the present invention. ing invention can be removed from the cast steel piston. Thus, the invention relates to a cast one-piece steel piston, in which the removal of the core for the cooling channel, in particular of the ceramic core, is done in an economical manner, in particular leads to a cost reduction. For this purpose, a plurality of openings with any sufficient cross-section, in particular kidney-shaped or similar openings with a sufficient cross section, are provided in the casting, which are closed form-fit or material-locking after the removal of the core. In this case, the oil inlet or oil outlet bore can already be integrated by suitable manufacturing process in the occluding component.
In Weiterbildung der Erfindung ist vorgesehen, dass die Gießform dazu ausgebildet ist, den verlorenen Kern über Pinolen oder dergleichen zu halten. Damit kann der gesamte Stahlkolben sehr schnell und einfach im Feinguss-Verfahren gegossen werden, wobei ebenso schnell und einfach der verlorene Kern nach dem Erstarren der Gießschmelze entfernt werden kann.In a further development of the invention, it is provided that the casting mold is designed to hold the lost core via sleeves or the like. Thus, the entire steel piston can be poured very quickly and easily by precision casting, with just as quickly and easily the lost core can be removed after the solidification of the casting melt.
In Weiterbildung der Erfindung besteht die Gießform aus einem hitzebeständigen Wachsmaterial. Dieses Wachsmaterial hat neben anderen, in Frage kommenden Materialien für die Gießform den Vorteil, dass die spätere, das heißt nach dem Gießen entstehende Außenkontur des Stahlkolbens schon sehr genau ist und den späteren Außenmaßen entspricht, so dass der anschließende Schritt der Fertigbearbeitung weniger aufwendig ist als beim Einsatz von anderen Materialien für die Gießform.In a further development of the invention, the casting mold consists of a heat-resistant wax material. This wax material has, among other suitable materials for the casting mold the advantage that the subsequent, that is, after casting resulting outer contour of the steel piston is very accurate and corresponds to the later external dimensions, so that the subsequent step of finishing is less expensive than when using other materials for the mold.
Die beiden Figuren 1 und 2 zeigen einerseits einen Schnitt durch einen einteiligen Stahlkolben 1 , und andererseits eine dreidimensionale Ansicht eines solchen Kolbens, der im Feinguss-Gießverfahren hergestellt worden ist. Hierbei ist erkennbar, dass im Kolbenboden 2, insbesondere hinter einem Ringfeld 3 mit mehreren Ringnuten und einer Brennraummulde 4 verlaufend, ein vorzugsweise radial umlaufender Kühlkanal 5 vorhanden ist, der mittels eines Kernes, insbesondere eines sand-, keramik- und/oder faserhaltigen Kernes, hergestellt worden ist. Außerdem weist der Kolben 1 in an sich bekannter Weise Kolbenschäfte und Bolzenbohrungen auf, die unterhalb des Kolbenbodens 2 angeordnet sind. Eine derartige beispielhafte, aber nicht einschränkende Ausgestaltung ist in den Figuren 1 und 2 gezeigt.The two figures 1 and 2 show on the one hand a section through a one-piece steel piston 1, and on the other hand, a three-dimensional view of such a piston, which has been produced by investment casting. It can be seen that in the piston head 2, in particular behind a ring field 3 with a plurality of annular grooves and a combustion bowl 4, a preferably radially encircling cooling channel 5 is present, by means of a core, in particular a sand-, ceramic- and / or fibrous core, has been produced. In addition, the piston 1 in a conventional manner piston shafts and bolt holes, the are arranged below the piston head 2. Such an exemplary, but non-limiting embodiment is shown in Figures 1 and 2.
Nach dem Gießen des Kolbens 1 wird zumindest ein Verschlussteil 6, insbesondere mehrere Verschlussteile 6, vorgesehen, die eine runde, ovale, nieren- oder andere geometrische Form aufweisen, das oder die nach dem Gießen des Kolbens 1 in die durch die Gießform und den verlorenen Kern gebildete Verbindung zu dem Kühlkanal 5 eingesetzt wird (werden). Diese Verschlußteile 6 werden aber nicht in alle Verbindungen eingesetzt, so dass dann zumindest eine öleintritts- und zumindest eine ölaustrittsbohrung bzw. -Öffnung zur Verfügung steht. Daneben ist es selbstverständlich auch denkbar, dass der Hohlraum nicht für ein zirkulierendes Kühlmedium, sondern zur Gewichtsersparnis genutzt wird.After casting the piston 1, at least one closure part 6, in particular a plurality of closure parts 6, is provided, which have a round, oval, kidney or other geometric shape, which or after the casting of the piston 1 in the through the casting mold and the lost Core formed connection to the cooling channel 5 is (are) used. However, these closure parts 6 are not used in all connections, so that then at least one oil inlet and at least one oil outlet hole or opening is available. In addition, it is of course also conceivable that the cavity is not used for a circulating cooling medium, but for weight savings.
Bei dem konkreten Ausführungsbeispiel, mit dem die in den Figuren 1 und 2 gezeigten Kolben hergestellt werden, handelt es sich also um das Feinguss-Verfahren. Bei diesem Verfahren wird eine Negativ-Form, die die späteren äußeren Konturen des zu gießenden Kolbenrohlings abbildet, aus einem hitzebeständigen, insbesondere einem Wachsmaterial hergestellt. Dabei wird in erfindungsgemäßer Weise an dieser Form über Stifte, insbesondere Wachsstifte, Pinolen oder dergleichen das Kernmaterial auf Distanz befestigt und die Negativ-Form mit Gießschmelze gefüllt. Nachdem Erstarren der Gießschmelze wird die Negativ-Form entfernt, so dass als Zulauf- bzw. Ablauföffnungen für den Kühlkanal die zu entfernenden Stifte, Pinolen und dergleichen dienen. Nachdem auch diese entfernt worden sind, genauso wie das Kernmaterial, wird das zumindest eine Verschlussteil in die Öffnung eingebracht, um den Kühlkanal zu verschließen. Das jeweilige Verschlussteil kann kraft- und/oder formschlüssig an der Unterseite des Kühlkanales oder an anderer Stelle, an der sich die Halterung für das Kernmaterial befunden haben, angebracht werden. Ergänzend oder alternativ zu dem Verschlussteil ist es denkbar, an die zumindest eine Stelle, an der nach dem Gießen die Öffnung entstanden ist, kein Verschlussteil anzubringen, um damit die Zulauf- oder Ablaufbohrung zu realisieren.In the specific embodiment with which the pistons shown in Figures 1 and 2 are made, so it is the investment casting process. In this method, a negative mold, which images the later outer contours of the piston blank to be cast, made of a heat-resistant, in particular a wax material. In this case, according to the invention, the core material is fixed at a distance to these molds via pins, in particular wax pencils, quills or the like, and the negative mold is filled with molten casting. After solidification of the casting melt, the negative mold is removed, so that serve as inlet or outlet openings for the cooling channel to be removed pins, quills and the like. After these have been removed, as well as the core material, the at least one closure part is introduced into the opening to close the cooling channel. The respective closure part can be non-positively and / or positively attached to the underside of the cooling channel or elsewhere, where the holder for the core material have been found attached. In addition or as an alternative to the closure part, it is conceivable to attach no closure part to the at least one point at which the opening has arisen after casting, in order to realize the inlet or outlet bore.
In Figur 2 ist noch einmal das Verschlussteil 6 erkennbar, das in die Öffnung, die nach dem Gießen des Stahlkolbens entsteht eingesetzt wird. Die beim Gießen ent- stehende Öffnung erstreckt sich in vorteilhafter Weise in Bezug auf die Kolbenhubachse nach unten, da aus dieser Richtung im Regelfall das Kühlmedium (Kühlöl) eingespritzt wird. Die Erfindung sieht vor, dass die beim Gießen entstehenden Öffnungen in dem Kühlkanal 5 radial umlaufend an mehreren Stellen unterhalb des Kühlkanales 5 vorhanden sind, dass bedeutet das solche Öffnungen nur abschnittsweise vorhanden sind. Das heißt, dass der Kühlkanal 5 an seiner Unterseite nach dem Gießen verschlossen ist, jedoch zwei oder mehr Öffnungen vorhanden sind. Diese Öffnungen werden als Zulauf- und Ablauföffnung für das Kühlmedium genutzt. Sind mehr als zwei solcher Öffnungen vorhanden, können diese ebenfalls als Zulauf- oder Ablauföffnung für das Kühlmedium dienen. Daneben ist es denkbar, sämtliche Öffnungen mit dem Verschlussteil 6 zu verschließen, bis auf zumindest eine Zulauf- und zumindest eine Ablauföffnung für das Kühlmedium. Außerdem ist es denkbar, dass sämtliche nach dem Gießen vorhanden Öffnungen in dem Kühlkanal 5 von einem Verschlussteil 6 verschlossen ist, so dass danach der Kühlkanal 5 komplett verschlossen ist. Um den Zulauf und den Ablauf für das Kühlmedium zu realisieren kann dann entweder an anderer Stelle (neben der durch das Verschlussteil 6 verschlossenen Öffnung zu mindest eine Zulauf- und Ablauföffnung für das Kühlmedium) eingebracht, insbesondere gebohrt werden. Weiterhin ist es denkbar, dass das Verschlussteil 6 seinerseits eine Öffnung aufweist, die dann als Zulauf oder Ablauf für das Kühlmedium dient. In Figure 2, the closure member 6 can be seen again, which is inserted into the opening, which is formed after the casting of the steel piston. The casting when casting standing opening extends in an advantageous manner with respect to the piston stroke down, since from this direction usually the cooling medium (cooling oil) is injected. The invention provides that the resulting during casting openings are present in the cooling channel 5 radially circumferentially at several points below the cooling channel 5, that means that such openings are only partially available. That is, the cooling channel 5 is closed at its bottom after casting, but two or more openings are present. These openings are used as inlet and outlet opening for the cooling medium. If more than two such openings are present, they can also serve as inlet or drain opening for the cooling medium. In addition, it is conceivable to close all openings with the closure part 6, except for at least one inlet and at least one outlet opening for the cooling medium. Moreover, it is conceivable that all openings present in the cooling channel 5 after casting are closed by a closure part 6, so that thereafter the cooling channel 5 is completely closed. In order to realize the inlet and the outlet for the cooling medium can then either at another point (in addition to the closed by the closure member 6 opening at least one inlet and outlet opening for the cooling medium) are introduced, in particular to be drilled. Furthermore, it is conceivable that the closure part 6 in turn has an opening which then serves as an inlet or outlet for the cooling medium.

Claims

Patentansprüche claims
1. Verfahren zur Herstellung eines einteiligen Stahlkolbens einer Brennkraftmaschine eines Personenkraftwagens, wobei der Stahlkolben in einem Gießverfahren unter Verwendung einer die äußeren Konturen des Stahlkolbens bildende Gießform und nach dem Gießen fertig bearbeitet wir, wobei zur Realisierung eines Kühlkanales ein verlorener Kern eingesetzt wird, dadurch gekennzeichnet, dass das Gießverfahren ein Feingussverfahren ist und die Gießform und der verlorene Kern so gestaltet sind, dass zumindest zwei o- der mehr verschließbare Öffnungen in dem Kühlkanal entstehen, nachdem die Gießform und der verlorene Kern entfernt worden sind.1. A method for producing a one-piece steel piston of an internal combustion engine of a passenger car, wherein the steel piston in a casting process using a the outer contours of the steel piston forming mold and after casting we finished, wherein for the realization of a cooling channel, a lost core is used, characterized in that the casting method is a precision casting method and the casting mold and the lost core are designed so that at least two or more closable openings are formed in the cooling channel after the casting mold and the lost core have been removed.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Gießform dazu ausgebildet ist, den verlorenen Kern über Pinolen oder dergleichen zu halten.2. The method according to claim 1, characterized in that the casting mold is adapted to hold the lost core over quills or the like.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Gießform aus einem hitzebeständigen Wachsmaterial besteht.3. The method according to claim 1 or 2, characterized in that the casting mold consists of a heat-resistant wax material.
4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die zumindest eine Öffnung des Kühlkanales mit einem Verschlussteil verschlossen wird.4. The method according to any one of the preceding claims, characterized in that the at least one opening of the cooling channel is closed with a closure part.
5. Stahlkolben (1) mit einem Kühlkanal (5), gekennzeichnet durch seine Herstellung nach dem Verfahren nach einem der vorhergehenden Ansprüche.5. steel piston (1) with a cooling channel (5), characterized by its production by the method according to one of the preceding claims.
6. Stahlkolben (1) nach Anspruch 5, dadurch gekennzeichnet, dass das Verschlussteil (6) für die zumindest eine Öffnung des Kühlkanales (5) oval- oder nierenförmig ausgebildet ist. 6. Steel piston (1) according to claim 5, characterized in that the closure part (6) for the at least one opening of the cooling channel (5) is oval or kidney-shaped.
7. Stahlkolben (1) nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass das Verschlussteil (6) Kraft- und/oder Formschlüssig in die zumindest eine Öffnung des Kühlkanales (5) eingesetzt ist.7. Steel piston (1) according to claim 5 or 6, characterized in that the closure part (6) force and / or positive fit in the at least one opening of the cooling channel (5) is inserted.
8. Stahlkolben (1) nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, dass das Verschlussteil (6) eine Öffnung für einen Zulauf- oder Ablauf eines Kühlmediums in den Kühlkanal (5) hinein oder aus dem Kühlkanal (5) heraus aufweist. 8. Steel piston (1) according to one of claims 5 to 7, characterized in that the closure part (6) has an opening for an inlet or outlet of a cooling medium into the cooling channel (5) or out of the cooling channel (5) out.
EP06818435A 2005-11-10 2006-11-09 One-part steel piston as a precision-casting variant with a core for the precision-casting production of a cooling channel Active EP1954424B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005053999 2005-11-10
PCT/EP2006/010737 WO2007054299A1 (en) 2005-11-10 2006-11-09 One-part steel piston as a precision-casting variant with a core for the precision-casting production of a cooling channel

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EP1954424A1 true EP1954424A1 (en) 2008-08-13
EP1954424B1 EP1954424B1 (en) 2011-08-10

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Publication number Priority date Publication date Assignee Title
DE102011116332A1 (en) * 2011-07-05 2013-01-10 Mahle International Gmbh Piston for an internal combustion engine
CN103394642A (en) * 2013-07-19 2013-11-20 宁波吉威熔模铸造有限公司 Casting method of automobile engine piston

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BR8700642A (en) * 1987-02-09 1988-08-30 Metal Leve Sa ARTICULATED PLATE
JP3915155B2 (en) * 1996-12-17 2007-05-16 アイシン精機株式会社 Manufacturing method of piston for internal combustion engine

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ATE519551T1 (en) 2011-08-15
EP1954424B1 (en) 2011-08-10

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