EP3377244A1 - Cast inflow and outflow openings for cast-steel and cast-iron pistons - Google Patents

Cast inflow and outflow openings for cast-steel and cast-iron pistons

Info

Publication number
EP3377244A1
EP3377244A1 EP16801730.9A EP16801730A EP3377244A1 EP 3377244 A1 EP3377244 A1 EP 3377244A1 EP 16801730 A EP16801730 A EP 16801730A EP 3377244 A1 EP3377244 A1 EP 3377244A1
Authority
EP
European Patent Office
Prior art keywords
core
piston
cast
casting
opening
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.)
Pending
Application number
EP16801730.9A
Other languages
German (de)
French (fr)
Inventor
Gregor Müller
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 EP3377244A1 publication Critical patent/EP3377244A1/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
    • B22D15/02—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of cylinders, pistons, bearing shells or like thin-walled objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • 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
    • 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
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
    • B22D29/001—Removing cores
    • B22D29/002—Removing cores by leaching, washing or dissolving

Definitions

  • the invention relates to a method of manufacturing a piston having a lost-core cooling channel, wherein in a casting process using a casting mold into which the core is inserted prior to casting, a piston blank is cast using a casting melt and after solidification the foundry melt is taken from the piston blank of the mold and then the core is rinsed out and then a finishing of the piston blank to produce the piston, according to the features of the preamble of claim 1.
  • a lost core such as a sand core
  • a metallic holding piece wherein in the casting mold, a permanent magnet is present, on which this metallic holding piece is placed and thereby held.
  • the underside of the lost core surrounding the metallic holding piece rests on the holding device, in which the permanent magnet is, so that thereby a cylindrical end of the core is realized.
  • the core extends into a region of the casting mold which forms an inner region of the piston blank and, with the core, forms at least one opening having a rounded profile for the cooling channel after rinsing.
  • a lost nucleus e.g. a salt or sand core
  • any shapes of the opening can be realized.
  • the cross-section of the opening no longer has to be round, but may also have oval or any other shapes which are roundish in cross-section.
  • the lost core completely forms the opening area for access to the cooling channel, namely also starting from the interior of the piston, so that it must be rinsed only after casting and solidification of the casting melt. Machining operations, such as Drilling (in particular for the realization of the opening itself), or reworking by machining processes are completely eliminated, so that according to the invention there is no risk that smaller particles, which are produced during the machining, can penetrate into the cooling circuit of the internal combustion engine.
  • any shapes are provided in a further development of the invention that is formed as an opening at least one inlet opening with a circumferential bead by means of the core, optionally supplemented by the formation of the opening by means of the lost core at least as a drain opening also with a circumferential bead.
  • the invention therefore, not just an opening from the direction of the inner region of the piston is introduced in the direction of the cooling channel, but this also designed advantageous.
  • the circumferential bead at least around the inlet opening this area is not only reinforced but also given a shape by means of which cracks in the structure of the material around the opening are effectively avoided.
  • the cross-section of the opening must not be circular, but may also be viewed in cross-section oval or formed in its circulation with several changes in the course of an arcuate shape.
  • a beam splitter is formed.
  • This beam splitter is, for example, at the apex of the cooling channel, so that it protrudes downwards into the free region of the cooling channel when the piston stroke axis is considered.
  • an oil jet which is injected via the at least one inlet opening in the direction of the cooling channel, can be directed in a specific direction or in two different directions.
  • FIG. 1 shows a piston blank 1, which has an outer contour designated 2 after its production.
  • the piston blank 1 is produced by means of a corresponding casting process using a casting mold, wherein the casting mold has the inner contour of the outer contour 2 of the piston blank 1.
  • the casting mold can be designed in one or more parts.
  • a lost core 3 is provided, which is suitably arranged on or on the casting mold, eg the inner insert of the casting mold. It is also conceivable to provide more than one lost core 3.
  • the casting mold is filled with cast melt and waited until it has solidified. Subsequently, the mold is removed, wherein initially the lost core 3 remains in the produced piston blank 1. This is rinsed out in the usual form, thereby creating an interior in the piston blank 1 is formed, which corresponds to the outer shape of the core 3 and forms a cooling channel 4.
  • the contour shown in Figure 1 or the course of the cooling channel 4 is exemplary and not limited thereto. 5 with a dashed line is a finished contour after the piston blank 1 has been further processed. In particular, this finishing is done by machining the outer region of the piston blank 1. This finishing is done either after or possibly before rinsing the core 3.
  • the finished piston finally has per se known elements, such as a ring field, a pin bore 6, a piston skirt 7 and other conventional elements (such as optionally a combustion bowl) on ,
  • FIG. 2 shows a view into an inner region of a finished piston 8, which is based on the piston blank 1 according to FIG.
  • a finished piston 8 which is based on the piston blank 1 according to FIG.
  • connecting walls extend in the direction of the supporting piston shanks 7.
  • These are arranged on the underside of the upper part of the finished piston 8, wherein at least one inlet opening 9 is located on this underside.
  • a circumferential bead 10 is arranged around the inlet opening 9 around.
  • the cross section of the inlet opening 9 is circular, but may deviate from this geometric shape. The same then applies to the circumferential bead 10th
  • the injection of cooling oil takes place via the (at least one) inlet opening 9, so that the cooling oil can circulate in the cooling channel 4.
  • at least one drain opening 12 is present, which also with a circumferential bead thirteenth is provided, but does not have to be.
  • the openings 9, 12 are produced according to the invention mitteis the lost core 3, wherein by means of the lost core, which extends into a region of the mold, which forms an inner region of the piston blank 1, and the rounded Course of the opening 9, 12, for example, realized with the reinforcement of the respective area serving circumferential bead 0, 13, is produced.

Abstract

Method for producing a piston (8), which has a cooling channel (4) created by means of a lost core (3), wherein, in a casting process using a casting mould into which the core (3) is placed before casting and using a casting melt, a piston blank (1) is cast and, after the casting melt has solidified, the piston blank (1) is removed from the casting mould and the core (3) is subsequently flushed out, and this is followed by the finishing of the cast blank (1) to produce the piston (8), wherein the core (3) extends into a region of the casting mould that forms an inner region of the piston blank (1) and the core (3) is used to form at least one opening having a rounded profile for the cooling channel (4) after the flushing out.

Description

Gegossene Zu- und Ablauföffnungen bei Stahlguss- und Eisengusskolben  Cast inlet and outlet openings for cast steel and cast iron pistons
B E S C H R E I B U N G DESCRIPTION
Die Erfindung betrifft ein Verfahren zur Hersteilung eines Kolbens, der einen mittels eines verlorenen Kernes erzeugten Kühlkanal aufweist, wobei in einem Gießverfahren unter Anwendung einer Gießform, in die der Kern vor dem Gießen eingesetzt wird, unter Verwendung einer Gießschmelze ein Kolbenrohling gegossen und nach dem Erstarren der Gießschmelze der Kolbenrohling der Gießform entnommen und anschließend der Kern ausgespült wird und danach eine Fertigbearbeitung des Kolbenrohlings zur Erzeugung des Kolbens erfolgt, gemäß den Merkmalen des Oberbegriffes des Patentanspruches 1. The invention relates to a method of manufacturing a piston having a lost-core cooling channel, wherein in a casting process using a casting mold into which the core is inserted prior to casting, a piston blank is cast using a casting melt and after solidification the foundry melt is taken from the piston blank of the mold and then the core is rinsed out and then a finishing of the piston blank to produce the piston, according to the features of the preamble of claim 1.
Ein solches Verfahren zur Herstellung eines Kolbens, der auch Kühlkanalkolben genannt wird, ist aus der US 4,559,685 bekannt. Ein verlorener Kern, z.B. ein Sandkern, wird an seinen Enden mit einem metallischen Haltestück versehen, wobei in der Gieß- form ein Permanentmagnet vorhanden ist, auf den dieses metallische Haltestück aufgesetzt und dadurch gehalten wird. Die das metallische Haltestück umgebende Unterseite des verlorenen Kernes liegt auf der Halteeinrichtung, in der der Permanentmagnet ist, auf, sodass dadurch ein zylinderförmiges Ende des Kernes realisiert ist. Infolge dessen ergibt sich nach dem Ausspülen des Kernes aus dem fertiggegossenen Kol- benrohling ein relativ scharfkantiger Übergang in dem den Kühlkanal umgebenden Materialbereich des Kolben rohlings, sodass dadurch Spannungen im Gefüge des Materials des Kolbens entstehen, aus denen sich Risse bilden können, wenn der fertige Kolben im Betrieb des Zylinders der Brennkraftmaschine läuft. Der Erfindung liegt daher die Aufgabe zugrunde, die eingangs geschilderten Nachteile zu vermeiden. Diese Aufgabe ist durch die Merkmale des Patentanspruches 1 gelöst. Such a method for producing a piston, which is also called cooling channel piston, is known from US 4,559,685. A lost core, such as a sand core, is provided at its ends with a metallic holding piece, wherein in the casting mold, a permanent magnet is present, on which this metallic holding piece is placed and thereby held. The underside of the lost core surrounding the metallic holding piece rests on the holding device, in which the permanent magnet is, so that thereby a cylindrical end of the core is realized. As a result, after flushing the core out of the finished cast piston blank, a relatively sharp-edged transition occurs in the material region of the piston blank surrounding the cooling duct, thereby creating stresses in the structure of the material of the piston from which cracks may form when the finished one Piston during operation of the cylinder of the internal combustion engine is running. The invention is therefore based on the object to avoid the disadvantages described above. This object is solved by the features of claim 1.
Erfindungsgemäß ist vorgesehen, dass sich der Kern bis in einen Bereich der Gießform erstreckt, die einen Innenbereich des Kolbenrohlings ausbildet und mit dem Kern zumindest eine einen gerundeten Verlauf aufweisende Öffnung für den Kühlkanal nach dem Ausspülen gebildet wird. Mittels des Erstreckens des Kernes in einen Bereich der Gießform, die einen Innenbereich des Kolbenrohlings ausbildet, kann ein nahtloser Übergang um die Öffnung zu dem Kühlkanal realisiert werden. Diese Öffnung erstreckt sich dann nicht nur von der Öffnung selbst ausgehend in Richtung des Kühlkanales, sondern sie erstreckt sich auch in umgekehrter Richtung ausgehend von der Öffnung in Richtung des Innenbereiches. Nicht nur diese Erstreckung des Verlaufes der Öffnung, sondern auch der gerundete Verlauf der Öffnung für den Kühlkanal hat den Vorteil, dass keine scharfkantigen Übergänge entstehen, sodass dadurch Rissbildungen wirksam vermieden werden. Ein weiterer Vorteil ist darin zu sehen, dass mittels eines verlorenen Kernes, z.B. ein Salz- oder Sandkern, beliebige Formen der Öffnung realisiert werden können. Der Querschnitt der Öffnung muss nicht mehr rund sein, sondern kann auch oval oder andere beliebige im Querschnitt rundlich verlaufende Formen aufweisen. Außerdem ist es ein ganz wesentlicher Vorteil, dass der verlorene Kern vollständig den Öffnungsbereich für den Zugang zu dem Kühlkanal bildet, nämlich auch ausgehend von dem Innenbereich des Kolbens, sodass dieser lediglich nach dem Gießen und dem Erstarren der Gießschmelze ausgespült werden muss. Spanabhebende Bearbeitungen, wie z.B. Bohren (insbesondere zur Realisierung der Öffnung an sich), oder Nachbearbeitungen durch spanabhebende Verfahren entfallen vollständig, sodass nach der Erfindung nicht die Gefahr besteht, dass kleinere Partikel, die bei der spanabhebenden Bearbeitung entstehen, in den Kühlkreislauf der Brennkraftmaschine eindringen können. According to the invention, it is provided that the core extends into a region of the casting mold which forms an inner region of the piston blank and, with the core, forms at least one opening having a rounded profile for the cooling channel after rinsing. By extending the core into a region of the casting mold which forms an inner region of the piston blank, a seamless transition can be realized around the opening to the cooling channel. This opening then extends not only from the opening itself, starting in the direction of the cooling channel, but it also extends in the opposite direction, starting from the opening in the direction of the inner region. Not only this extent of the course of the opening, but also the rounded course of the opening for the cooling channel has the advantage that no sharp-edged transitions arise, so that cracking effectively be avoided. Another advantage is that by means of a lost nucleus, e.g. a salt or sand core, any shapes of the opening can be realized. The cross-section of the opening no longer has to be round, but may also have oval or any other shapes which are roundish in cross-section. In addition, it is a very significant advantage that the lost core completely forms the opening area for access to the cooling channel, namely also starting from the interior of the piston, so that it must be rinsed only after casting and solidification of the casting melt. Machining operations, such as Drilling (in particular for the realization of the opening itself), or reworking by machining processes are completely eliminated, so that according to the invention there is no risk that smaller particles, which are produced during the machining, can penetrate into the cooling circuit of the internal combustion engine.
Als Beispie! für beliebige Formgebungen sind in Weiterbildung der Erfindung vorgesehen, dass als Öffnung zumindest eine Zulauföffnung mit einem umlaufenden Wulst mittels des Kernes gebildet wird, optional ergänzt um die Bildung der Öffnung mittels des verlorenen Kernes zumindest als eine Ablauföffnung ebenfalls mit einem umlaufenden Wulst. Nach der Erfindung wird also nicht einfach nur eine Öffnung aus Richtung des Innenbereiches des Kolbens in Richtung des Kühlkanales eingebracht, sondern diese auch vorteilhaft gestaltet. Mittels des umlaufenden Wulstes zumindest um die Zulauföffnung herum wird dieser Bereich nicht nur verstärkt, sondern ihm auch eine Formgebung gegeben, mittels derer Risse im Gefüge des Materials um die Öffnung herum wirksam vermieden werden. Auch hier muss der Querschnitt der Öffnung nicht kreisförmig sein, sondern kann auch im Querschnitt betrachtet oval oder in ihrem Umlauf mit mehreren Änderungen des Verlaufes einer Bogenform ausgebildet sein. As an example! For any shapes are provided in a further development of the invention that is formed as an opening at least one inlet opening with a circumferential bead by means of the core, optionally supplemented by the formation of the opening by means of the lost core at least as a drain opening also with a circumferential bead. According to the invention, therefore, not just an opening from the direction of the inner region of the piston is introduced in the direction of the cooling channel, but this also designed advantageous. By means of the circumferential bead at least around the inlet opening, this area is not only reinforced but also given a shape by means of which cracks in the structure of the material around the opening are effectively avoided. Again, the cross-section of the opening must not be circular, but may also be viewed in cross-section oval or formed in its circulation with several changes in the course of an arcuate shape.
Ebenfalls ist in Weiterbildung der Erfindung vorgesehen, dass mittels des Kernes zumindest im Bereich der Zulauföffnung ein Strahlteiler gebildet wird. Dieser Strahlteiler liegt beispielsweise im Scheitelpunkt des Kühlkanales, sodass er bei Betrachtung der Kolbenhubachse nach unten in den freien Bereich des Kühlkanales hineinragt. Dadurch kann ein Ölstrahl, der über die zumindest eine Zulauföffnung in Richtung des Kühlkanales eingespritzt wird, in eine bestimmte Richtung oder auch in zwei unterschiedliche Richtungen gelenkt werden. It is also provided in development of the invention that by means of the core, at least in the region of the inlet opening, a beam splitter is formed. This beam splitter is, for example, at the apex of the cooling channel, so that it protrudes downwards into the free region of the cooling channel when the piston stroke axis is considered. As a result, an oil jet, which is injected via the at least one inlet opening in the direction of the cooling channel, can be directed in a specific direction or in two different directions.
Die Erfindung wird anhand eines Kolbens, der nach dem erfindungsgemäßen Verfahren hergestellt wird, im Folgenden näher beschrieben und anhand der Figuren erläutert. in Figur 1 ist ein Kolbenrohling 1 dargestellt, der eine mit 2 bezeichnete Außenkontur nach seiner Herstellung aufweist. Der Kolbenrohling 1 wird mittels eines entsprechenden Gießverfahrens unter Anwendung einer Gießform hergestellt, wobei die Gießform die Innenkontur der Außenkontur 2 des Kolben rohlings 1 aufweist. Die Gießform kann ein- oder mehrteilig gestaltet sein. Als ein Teil der Gießform ist ein verlorener Kern 3 vorgesehen, der in geeigneter Weise auf oder an der Gießform, z.B. dem inneren Einsatz der Gießform, angeordnet wird. Es ist auch denkbar, mehr als einen verlorenen Kern 3 vorzusehen. Nachdem der zumindest eine Kern 3 an der Gießform angeordnet und befestigt worden ist, wird die Gießform mit Gießschmelze aufgefüllt und abgewartet, bis diese erstarrt ist. Anschließend wird die Gießform entfernt, wobei zunächst der verlorene Kern 3 in dem hergestellten Kolbenrohling 1 verbleibt. Dieser wird in üblicher Form ausgespült, sodass dadurch ein Innenbereich in dem Kolbenrohling 1 entsteht, der der Außenform des Kernes 3 entspricht und der einen Kühlkanal 4 bildet. Die in der Figur 1 dargestellte Kontur bzw. der Verlauf des Kühlkanales 4 ist beispielhaft und hierauf nicht beschränkt. Mit 5 ist gestrichelt eine Fertigkontur bezeichnet, nachdem der Kolbenrohling 1 weiterbearbeitet worden ist. Insbesondere ist diese Fertigbearbeitung durch spanabhebende Bearbeitung des äußeren Bereiches des Kolbenrohlings 1 erfolgt. Diese Fertigbearbeitung erfolgt entweder nach oder ggf. auch vor dem Ausspülen des Kernes 3. Der fertigbearbeitete Kolben weist schließlich an sich bekannte Elemente auf, wie ein Ringfeld, eine Bolzenbohrung 6, einen Kolbenschaft 7 und weitere übliche Elemente (wie z.B. optional eine Brennraummulde) auf. The invention will be described in more detail below with reference to a piston, which is produced by the method according to the invention, and explained with reference to the figures. 1 shows a piston blank 1, which has an outer contour designated 2 after its production. The piston blank 1 is produced by means of a corresponding casting process using a casting mold, wherein the casting mold has the inner contour of the outer contour 2 of the piston blank 1. The casting mold can be designed in one or more parts. As a part of the casting mold, a lost core 3 is provided, which is suitably arranged on or on the casting mold, eg the inner insert of the casting mold. It is also conceivable to provide more than one lost core 3. After the at least one core 3 has been arranged and fastened to the casting mold, the casting mold is filled with cast melt and waited until it has solidified. Subsequently, the mold is removed, wherein initially the lost core 3 remains in the produced piston blank 1. This is rinsed out in the usual form, thereby creating an interior in the piston blank 1 is formed, which corresponds to the outer shape of the core 3 and forms a cooling channel 4. The contour shown in Figure 1 or the course of the cooling channel 4 is exemplary and not limited thereto. 5 with a dashed line is a finished contour after the piston blank 1 has been further processed. In particular, this finishing is done by machining the outer region of the piston blank 1. This finishing is done either after or possibly before rinsing the core 3. The finished piston finally has per se known elements, such as a ring field, a pin bore 6, a piston skirt 7 and other conventional elements (such as optionally a combustion bowl) on ,
In Figur 2 ist eine Ansicht in einen Innenbereich eines fertigen Kolbens 8, der auf dem Kolbenrohling 1 gemäß Figur 1 basiert, dargestellt. Bei diesem beispielhaften Design ist erkennbar, dass ausgehend von den Bolzenbohrungen 6 sich Verbindungswände in Richtung der tragenden Kolbenschäfte 7 erstrecken. Diese sind an der Unterseite des Oberteiles des fertigen Kolbens 8 angeordnet, wobei sich auf dieser Unterseite auch zumindest eine Zulauföffnung 9 befindet. In diesem Ausführungsbeispiel ist um die Zulauföffnung 9 herum ein umlaufender Wulst 10 angeordnet. Hierbei ist der Querschnitt der Zulauföffnung 9 kreisförmig, kann aber von dieser geometrischen Form abweichen. Gleiches gilt dann auch für den umlaufenden Wulst 10. 2 shows a view into an inner region of a finished piston 8, which is based on the piston blank 1 according to FIG. In this exemplary design, it can be seen that, starting from the bolt bores 6, connecting walls extend in the direction of the supporting piston shanks 7. These are arranged on the underside of the upper part of the finished piston 8, wherein at least one inlet opening 9 is located on this underside. In this embodiment, a circumferential bead 10 is arranged around the inlet opening 9 around. Here, the cross section of the inlet opening 9 is circular, but may deviate from this geometric shape. The same then applies to the circumferential bead 10th
Mit Blick durch die Zulauföffnung 9 in Richtung der Unterseite des Oberteiles des Kol- bens 8 ist noch ein optionaler Strahlteiler 11 in dem Kühlkanal 4 (genauer an dessen Scheitel, nach unten in Richtung der Zulauföffnung 9 ragend) dargestellt. Looking through the inlet opening 9 in the direction of the underside of the upper part of the piston 8 is still an optional beam splitter 11 in the cooling channel 4 (more precisely at its apex, projecting downwards in the direction of the inlet opening 9).
Bei dem Kolben 8 gemäß Figur 2 erfolgt das Einspritzen von Kühlöl über die (zumindest eine) Zulauföffnung 9, sodass das Kühlöl in dem Kühlkanal 4 zirkulieren kann. Damit es aus dem Kühlkanal 4 wieder austreten kann, ist gemäß Figur 2 zumindest eine Ablauföffnung 12 vorhanden, die ebenfalls mit einem umlaufenden Wulst 13 versehen ist, aber nicht sein muss. Die Öffnungen 9, 12 (und ggf. weitere Öffnungen) werden nach der Erfindung mitteis des verlorenen Kernes 3 hergestellt, wobei mittels des verlorenen Kernes, der sich bis in einen Bereich der Gießform erstreckt, die einen Innenbereich des Kolbenrohlings 1 ausbildet, auch der gerundete Verlauf der Öffnung 9, 12, beispielsweise realisiert mit dem der Verstärkung des jeweiligen Bereiches dienenden umlaufendem Wulst 0, 13, hergestellt wird. In the case of the piston 8 according to FIG. 2, the injection of cooling oil takes place via the (at least one) inlet opening 9, so that the cooling oil can circulate in the cooling channel 4. So that it can emerge from the cooling channel 4 again, according to Figure 2, at least one drain opening 12 is present, which also with a circumferential bead thirteenth is provided, but does not have to be. The openings 9, 12 (and possibly further openings) are produced according to the invention mitteis the lost core 3, wherein by means of the lost core, which extends into a region of the mold, which forms an inner region of the piston blank 1, and the rounded Course of the opening 9, 12, for example, realized with the reinforcement of the respective area serving circumferential bead 0, 13, is produced.
BEZUGSZEICHENLISTE LIST OF REFERENCE NUMBERS
1. Kolbenrohling 1st piston blank
2. Außenkontur  2. outer contour
3. verlorener Kern  3. lost core
4. Kühlkanal  4. Cooling channel
5. Fertigkontur  5. Finished contour
6. Bolzenbohrung  6. Bolt hole
7. Kolbenschaft  7. Piston shaft
8. fertiger Kolben  8. finished piston
9. Zulauföffnung  9. inlet opening
10. umlaufender Wulst  10. circumferential bead
11. Strahlteiler  11. Beam splitter
12. Ablauföffnung  12th drain opening
13. umlaufender Wulst  13. circumferential bead

Claims

P A T E N T A N S P R Ü C H E PATENT APPLICATIONS
1. Verfahren zur Herstellung eines Kolbens (8), der einen mittels eines verlorenen Kernes (3) erzeugten Kühlkanal (4) aufweist, wobei in einem Gießverfahren unter Anwendung einer Gießform, in die der Kern (3) vor dem Gießen eingesetzt wird, unter Verwendung einer Gießschmelze ein Kolbenrohling (1) gegossen und nach dem Erstarren der Gießschmelze der Kolbenrohling (1) der Gießform entnommen und anschließend der Kern (3) ausgespült wird und danach eine Fertigbearbeitung des Kolbenrohlings (1) zur Erzeugung des Kolbens (8) erfolgt, dadurch gekennzeichnet, dass sich der Kern (3) bis in einen Bereich der Gießform erstreckt, die einen innenbe- reich des Kolbenrohlings (1) ausbildet und mit dem Kern (3) zumindest eine einen gerundeten Verlauf aufweisende Öffnung für den Kühlkanal (4) nach dem Ausspülen gebildet wird. A method of manufacturing a piston (8) having a cooling channel (4) produced by means of a lost core (3), wherein in a casting process using a casting mold into which the core (3) is inserted prior to casting Using a casting melt poured a piston blank (1) and removed after the solidification of the casting melt the piston blank (1) of the mold and then the core (3) is rinsed and then a finishing of the piston blank (1) to produce the piston (8), characterized in that the core (3) extends into a region of the casting mold, which forms an inner region of the piston blank (1) and with the core (3) at least one rounded profile having opening for the cooling channel (4) the rinsing is formed.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass als Öffnung zu- mindest eine Zulauföffnung (9) mit einem umlaufenden Wulst (10) mittels des Kernes2. The method according to claim 1, characterized in that as opening at least one inlet opening (9) with a circumferential bead (10) by means of the core
(3) gebildet wird. (3) is formed.
3. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass als Öffnung zumindest eine Ablauföffnung (12) mit einem umlaufenden Wulst (13) mittels des Kernes (3) gebildet wird. 3. The method according to claim 1, characterized in that as an opening at least one drain opening (12) with a peripheral bead (13) by means of the core (3) is formed.
4. Verfahren nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass mittels des Kernes (3) zumindest im Bereich der Zulauföffnung (9) ein Strahlteiler (11) gebildet wird. 4. The method according to claim 2 or 3, characterized in that by means of the core (3) at least in the region of the inlet opening (9), a beam splitter (11) is formed.
EP16801730.9A 2015-11-19 2016-11-17 Cast inflow and outflow openings for cast-steel and cast-iron pistons Pending EP3377244A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015222878 2015-11-19
PCT/EP2016/077950 WO2017085164A1 (en) 2015-11-19 2016-11-17 Cast inflow and outflow openings for cast-steel and cast-iron pistons

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EP3377244A1 true EP3377244A1 (en) 2018-09-26

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EP16801730.9A Pending EP3377244A1 (en) 2015-11-19 2016-11-17 Cast inflow and outflow openings for cast-steel and cast-iron pistons

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US (1) US20180326477A1 (en)
EP (1) EP3377244A1 (en)
CN (1) CN108367340B (en)
BR (1) BR112018009733A8 (en)
DE (1) DE102016122080A1 (en)
MX (1) MX2018005970A (en)
WO (1) WO2017085164A1 (en)

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Publication number Priority date Publication date Assignee Title
WO2018114969A1 (en) 2016-12-19 2018-06-28 Ks Kolbenschmidt Gmbh Cooling channel having dam and funnel
CN110869600A (en) 2017-04-19 2020-03-06 Ks科尔本施密特有限公司 Piston with one form of construction
WO2020208058A1 (en) * 2019-04-09 2020-10-15 Ks Kolbenschmidt Gmbh Gallery-cooled piston with a funnel-shaped inlet into the cooling gallery

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JPS6015041A (en) 1983-07-05 1985-01-25 Aisin Seiki Co Ltd Production of piston with cooling cavity
JP2764071B2 (en) * 1988-10-31 1998-06-11 イズミ工業株式会社 Method of manufacturing piston for internal combustion engine
JP4276602B2 (en) * 2004-09-21 2009-06-10 株式会社豊田自動織機 Piston for internal combustion engine
DE102006056013A1 (en) * 2006-11-28 2008-05-29 Ks Kolbenschmidt Gmbh Piston for internal-combustion engine, has radially rotating cooling ducts spaced apart from each other and integrated to piston head and ring zone, and forming vertically aligned cross sectional profile
DE102007044105A1 (en) * 2007-04-27 2008-10-30 Mahle International Gmbh Casting core for forming a cooling channel in a piston produced by casting
DE102008020231A1 (en) * 2008-04-22 2009-10-29 Mahle International Gmbh Casting core for forming a cooling channel
DE102008002571A1 (en) * 2008-06-20 2009-12-31 Federal-Mogul Nürnberg GmbH Piston for an internal combustion engine
DE102011007285A1 (en) * 2011-04-13 2012-10-18 Mahle International Gmbh Piston for internal combustion engine, comprises piston upper portion and piston lower portion, annular cooling duct for cooling piston, during operation of internal combustion engine, and inlet opening arranged at piston lower portion
DE102011086411A1 (en) * 2011-11-15 2013-05-16 Mahle International Gmbh Mold for a piston
DE102012215543A1 (en) * 2012-08-31 2014-03-06 Mahle International Gmbh Casting mold of a piston
MX2013009848A (en) * 2012-09-11 2014-03-25 Gm Global Tech Operations Inc Sand casting an aluminum diesel piston with an as-cast, reentrant combustion bowl for light or medium duty diesel engines.
DE102012217939A1 (en) * 2012-10-01 2014-04-03 Mahle International Gmbh Process for the production of cores for the casting production of workpieces
DE102015206375A1 (en) * 2014-04-09 2015-10-15 Ks Kolbenschmidt Gmbh Extended cooling channel inlet for cooling channel pistons and method for its operation

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WO2017085164A1 (en) 2017-05-26
CN108367340A (en) 2018-08-03
BR112018009733A8 (en) 2019-02-26
CN108367340B (en) 2020-04-14
US20180326477A1 (en) 2018-11-15
MX2018005970A (en) 2018-09-05
DE102016122080A1 (en) 2017-05-24
BR112018009733A2 (en) 2018-11-06

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