WO2013117575A1 - Cooling channel piston blank completely produced in a forging method, and method for producing same - Google Patents

Cooling channel piston blank completely produced in a forging method, and method for producing same Download PDF

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Publication number
WO2013117575A1
WO2013117575A1 PCT/EP2013/052297 EP2013052297W WO2013117575A1 WO 2013117575 A1 WO2013117575 A1 WO 2013117575A1 EP 2013052297 W EP2013052297 W EP 2013052297W WO 2013117575 A1 WO2013117575 A1 WO 2013117575A1
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WO
WIPO (PCT)
Prior art keywords
piston
cooling channel
collar
piston blank
recess
Prior art date
Application number
PCT/EP2013/052297
Other languages
German (de)
French (fr)
Inventor
Manfred Erett
Bernd Sommer
Hans-Joachim Weimar
Eberhard Weiss
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 WO2013117575A1 publication Critical patent/WO2013117575A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/18—Making machine elements pistons or plungers
    • B21K1/185—Making machine elements pistons or plungers with cooling channels

Definitions

  • the invention relates to a method for producing a cooling channel piston, which has a cooling channel approximately in the area behind a ring field, wherein a piston blank is formed in a forging method, wherein also in the forging method, in particular approximately in the region of a land, at least one circumferential collar is formed, wherein the collar is reshaped by means of a forming such that the recess for forming the cooling channel is closed by the at least one collar and brought the free end of the collar to the piston blank to the plant, according to the features of the preamble of claim 1.
  • a method for producing a cooling channel piston is known from EP 1 452 250 A2, which has a cooling channel approximately in the region behind a ring field, wherein a piston blank is at least partially formed in a forging process, wherein also in the forging process, in particular approximately in the region of a land, at least one circumferential collar, that is projecting collar is formed, wherein behind the at least one collar is deformed by means of a transformation such that the recess is closed to form the cooling channel of the at least one deformed collar.
  • the recess is produced by means of a machining process. Although this has proven itself in practice, however, the disadvantage is given that on the one hand material is lost during chip removal, which must be recycled consuming. On the other hand, this is the structure in particular in the weakened so that thereby the finished and finished cooling duct piston is not optimal in terms of its strength.
  • the invention is therefore based on the object to provide a method for producing a cooling channel piston and a cooling channel piston produced thereafter, with which improves the implementation of the method and the component strength of the finished cooling channel piston is increased.
  • the introduction of the recess by a forging method has the advantage that a much higher loadable structure in the region of the piston head is formed, which is advantageous because this region of the piston crown, that is laterally and below the combustion bowl, or below the piston bottom surface (if no combustion bowl is present) is extremely heavily loaded by the prevailing combustion pressures and combustion temperatures.
  • a cooling channel piston is realized whose piston crown or the whole is produced in a forging process.
  • the recess, which forms the cooling channel after closing is introduced by means of a forging method, so that no chip removal process has to be carried out for its production.
  • a piston blank is shown, which is made entirely in a forging process.
  • the piston blank 1 has a piston crown 2 (upper part), wherein a collar 3 projects radially from the piston crown 2.
  • On the piston head 2 are down piston hub 4 with Kolben2020ften and bolt holes and possibly other elements that together form a piston base.
  • a contact region 5 is present, which is located in a transition region 6 between the piston head 2 and the piston lower part.
  • This transition region 6 is formed in the piston blank 1 according to the figure in approximately a circumferential ridge, but may also have other geometries in other piston designs.
  • the contact area 5 serves to receive the outer radial circumferential edge of the collar 3, after it has been formed. In order to be able to better define the end position of the collar 3 after it has been formed, a radially circumferential web or partial regions of a web can be present in this contact region 5, for example.
  • the piston blank shown in the single figure thus has a recess above the contact area 5, which is introduced in a forging process.
  • a substantially cylindrical piston blank and a preferably radially circumferential recess which forms the finished cooling channel after its closure by the collar or other means in the piston blank 1 by a forging process.
  • a recess of the shape is introduced in a subsequent step such that the recess is achieved by this subsequent forging step. After this is done, can in one directly following step or in a later step, this recess are suitably closed to form the cooling channel.
  • the cooling channel is substantially completely closed, with the exception of the required at least one inlet and the at least one drain opening.
  • piston blank 1 which was originally formed substantially cylindrical and has been introduced in the successive forging operations of the collar 3 and the recess above the contact area 5.
  • the piston blank can be further processed in a conventional manner, so that a finished cooling channel piston is formed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Forging (AREA)

Abstract

The invention relates to a method for producing a cooling channel piston which has a cooling channel approximately in the region behind a ring field. A piston blank (1) is formed in a forging method, and at least one peripheral collar (3) is likewise formed in the forging method, in particular approximately in the region of a top land. The collar is formed by means of a forming process such that the recess for forming the cooling channel is closed by the at least one collar (3), and the free end region of the collar is brought into contact with the piston blank. The invention is characterized in that the recess is introduced by a forging method.

Description

B E S C H R E I B U N G  DESCRIPTION
VOLLSTÄNDIG IM SCHMIEDEVERFAHREN HERGESTELLTER KOLBENROHLING EINES KÜHLKANALKOLBENS UND VERFAHREN ZU SEINER HERSTELLUNG COMBINED PISTON ROLLING OF A COOLANT PISTON AND METHOD FOR THE PRODUCTION THEREOF BY FULL PROCESS
Die Erfindung betrifft ein Verfahren zur Herstellung eines Kühlkanalkolbens, der einen Kühlkanal etwa im Bereich hinter einem Ringfeld aufweist, wobei ein Kolbenrohling in einem Schmiedeverfahren geformt wird, wobei ebenfalls im Schmiedeverfahren, insbesondere etwa im Bereich eines Feuersteges, zumindest ein umlaufender Bund geformt wird, wobei der Bund mittels einer Umformung derart umgeformt wird, dass die Ausnehmung zur Bildung des Kühlkanales von dem zumindest einen Bund verschlossen wird und der freie Endbereich des Bundes an dem Kolbenrohling zur Anlage gebracht, gemäß den Merkmalen des Oberbegriffes des Patentanspruches 1 . The invention relates to a method for producing a cooling channel piston, which has a cooling channel approximately in the area behind a ring field, wherein a piston blank is formed in a forging method, wherein also in the forging method, in particular approximately in the region of a land, at least one circumferential collar is formed, wherein the collar is reshaped by means of a forming such that the recess for forming the cooling channel is closed by the at least one collar and brought the free end of the collar to the piston blank to the plant, according to the features of the preamble of claim 1.
Aus der EP 1 452 250 A2 ist ein Verfahren zur Herstellung eines Kühlkanalkolbens bekannt, der einen Kühlkanal etwa im Bereich hinter einem Ringfeld aufweist, wobei ein Kolbenrohling zumindest teilweise in einem Schmiedeverfahren geformt wird, wobei ebenfalls im Schmiedeverfahren, insbesondere etwa im Bereich eines Feuersteges, zumindest ein umlaufender Bund, dass heißt abstehender Kragen, geformt wird, wobei hinter dem zumindest eine Bund mittels einer Umformung derart umgeformt wird, dass die Ausnehmung zur Bildung des Kühlkanales von dem zumindest einen umgeformten Bund verschlossen wird. A method for producing a cooling channel piston is known from EP 1 452 250 A2, which has a cooling channel approximately in the region behind a ring field, wherein a piston blank is at least partially formed in a forging process, wherein also in the forging process, in particular approximately in the region of a land, at least one circumferential collar, that is projecting collar is formed, wherein behind the at least one collar is deformed by means of a transformation such that the recess is closed to form the cooling channel of the at least one deformed collar.
Die Ausnehmung wird dabei mittels eines spanabhebenden Verfahrens hergestellt. Dies hat sich in der Praxis zwar bewährt, jedoch ist der Nachteil gegeben, dass zum einen Material bei der Spanabhebung verloren geht, welches aufwendig recycelt werden muss. Zum anderen wird dadurch das Gefüge insbesondere in dem umzuformenden Bereich geschwächt, so dass dadurch der fertig hergestellte und endbearbeitete Kühlkanalkolben hinsichtlich seiner Festigkeit nicht optimal ist. The recess is produced by means of a machining process. Although this has proven itself in practice, however, the disadvantage is given that on the one hand material is lost during chip removal, which must be recycled consuming. On the other hand, this is the structure in particular in the weakened so that thereby the finished and finished cooling duct piston is not optimal in terms of its strength.
Der Erfindung liegt daher die Aufgabe zu Grunde, ein Verfahren zur Herstellung eines Kühlkanalkolbens sowie einen danach hergestellten Kühlkanalkolben anzugeben, mit dem die Durchführung des Verfahrens verbessert und die Bauteilfestigkeit des fertigen Kühlkanalkolbens erhöht wird. The invention is therefore based on the object to provide a method for producing a cooling channel piston and a cooling channel piston produced thereafter, with which improves the implementation of the method and the component strength of the finished cooling channel piston is increased.
Diese Aufgabe ist durch die Merkmale des unabhängigen Patentanspruches 1 gelöst. This object is solved by the features of independent claim 1.
Das Einbringen der Ausnehmung durch ein Schmiedeverfahren hat den Vorteil, dass ein wesentlich höheres belastbares Gefüge im Bereich des Kolbenbodens entsteht, wobei dies von Vorteil ist, weil dieser Bereich des Kolbenbodens, dass heißt seitlich und unterhalb der Brennraummulde, bzw. unterhalb der Kolbenbodenfläche (wenn keine Brennraummulde vorhanden ist) durch die herrschenden Verbrennungsdrücke und Verbrennungstemperaturen äußerst stark belastet wird. Das bedeutet, dass mit dem erfindungsgemäßen Verfahren letztendlich ein Kühlkanalkolben realisiert wird, dessen Kolbenboden oder der insgesamt in einem Schmiedeverfahren hergestellt wird. Auch die Ausnehmung, die nach dem Verschließen den Kühlkanal bildet, wird mittels eines Schmiedeverfahrens eingebracht, so dass zu deren Herstellung kein spanabhebendes Verfahren durchgeführt werden muss. Es kann lediglich daran gedacht werden, dass die Ausnehmung überwiegend durch ein Schmiedeverfahren eingebracht wird, jedoch eine geringfügige Maß- oder Formkorrektur mittels eines spanabhebenden Verfahrens erfolgt. Dieser letzte spanabhebende geringfügige Schritt hat jedoch keinerlei Auswirkung auf das im Schmiedeverfahren erzielte hochbelastbare Gefüge des Kolbenrohlings und des fertigen Kolbens. The introduction of the recess by a forging method has the advantage that a much higher loadable structure in the region of the piston head is formed, which is advantageous because this region of the piston crown, that is laterally and below the combustion bowl, or below the piston bottom surface (if no combustion bowl is present) is extremely heavily loaded by the prevailing combustion pressures and combustion temperatures. This means that with the method according to the invention ultimately a cooling channel piston is realized whose piston crown or the whole is produced in a forging process. Also, the recess, which forms the cooling channel after closing, is introduced by means of a forging method, so that no chip removal process has to be carried out for its production. It can only be thought that the recess is mainly introduced by a forging method, but a slight dimensional or shape correction by means of a machining process takes place. However, this last machining minor step has no effect on the high-strength structure of the piston blank and the finished piston obtained in the forging process.
Nachdem die Ausnehmung im Schmiedeverfahren eingebracht worden ist, kann sie in üblicher Form, wie dies z. B. in der DE 10 2004 031 513 A1 oder der EP 1 452 250 A2 beschrieben ist, verschlossen werden. Im Folgenden wird eine beispielhafte Ausführung eines Kolbens, der nach dem erfindungsgemäßen Verfahren hergestellt worden ist, anhand der einzigen Figur beschrieben und erläutert. After the recess has been introduced in the forging process, it can in the usual form, as z. B. in DE 10 2004 031 513 A1 or EP 1 452 250 A2, are closed. In the following, an exemplary embodiment of a piston, which has been produced by the method according to the invention, described and explained with reference to the single figure.
In der einzigen Figur ist mit der Bezugsziffer 1 ein Kolbenrohling dargestellt, der komplett in einem Schmiedeverfahren hergestellt wird. Der Kolbenrohling 1 weist einen Kolbenboden 2 (Oberteil) auf, wobei von dem Kolbenboden 2 radial umlaufend ein Kragen 3 absteht. An dem Kolbenboden 2 befinden sich nach unten Kolbennaben 4 mit Kolbenschäften und Bolzenbohrungen und gegebenenfalls weiteren Elementen, die zusammen ein Kolbenunterteil bilden. In the single figure, the reference numeral 1, a piston blank is shown, which is made entirely in a forging process. The piston blank 1 has a piston crown 2 (upper part), wherein a collar 3 projects radially from the piston crown 2. On the piston head 2 are down piston hub 4 with Kolbenschäften and bolt holes and possibly other elements that together form a piston base.
In einem Übergangsbereich zwischen dem Kolbenboden 2 und dem Kolbenunterteil, vorzugsweise an der oberen umlaufenden Kante der Kolbennaben 4, ist ein Anlagebereich 5 vorhanden, der sich in einem Übergangsbereich 6 zwischen dem Kolbenboden 2 und dem Kolbenunterteil befindet. Dieser Übergangsbereich 6 ist bei dem Kolbenrohling 1 gemäß der Figur in etwa als umlaufender Steg ausgebildet, kann aber bei anderen Kolbenbauformen auch andere Geometrien aufweisen. Der Anlagebereich 5 dient zur Aufnahme der äußeren radial umlaufenden Kante des Kragens 3, nachdem er umgeformt worden ist. Um die Endlage des Kragens 3 nach seiner Umformung besser definieren zu können, kann in diesem Anlagebereich 5 beispielsweise ein radial umlaufender Steg oder Teilbereiche eines Steges vorhanden sein. Der in der einzigen Figur dargestellte Kolbenrohling weist somit eine Ausnehmung oberhalb des Anlagebereiches 5 auf, die in einem Schmiedeverfahren eingebracht wird. Alternativ dazu ist es auch denkbar, einen im wesentlichen zylinderförmigen Kolbenrohling herzustellen und eine vorzugsweise radial umlaufende Ausnehmung, die nach ihrem Verschluss durch den Kragen oder andere Mittel den fertigen Kühlkanal bildet, in den Kolbenrohling 1 durch ein Schmiedeverfahren einzubringen. Dass heißt, dass zunächst ein im Wesentlichen zylinderförmiger Kolbenrohling hergestellt wird, der noch keine Ausnehmung, die den späteren Kühlkanal bildet, aufweist. Nach der Herstellung des zylinderförmigen Kolbenrohlings wird in einem sich anschließenden Schritt eine Ausnehmung der Gestalt eingebracht, dass durch diesen anschließenden Schmiedeschritt die Ausnehmung erzielt wird. Nachdem dies erfolgt wird, kann in einem direkt folgenden Schritt oder in einem späteren Schritt diese Ausnehmung in geeigneter Weise verschlossen werden, um den Kühlkanal zu bilden. Das bedeutet, dass der Kühlkanal im Wesentlichen vollständig verschlossen wird, mit Ausnahme der erforderlichen zumindest einen Zulauf- und der zumindest einen Ablauföffnung. In a transition region between the piston head 2 and the piston lower part, preferably at the upper circumferential edge of the piston hub 4, a contact region 5 is present, which is located in a transition region 6 between the piston head 2 and the piston lower part. This transition region 6 is formed in the piston blank 1 according to the figure in approximately a circumferential ridge, but may also have other geometries in other piston designs. The contact area 5 serves to receive the outer radial circumferential edge of the collar 3, after it has been formed. In order to be able to better define the end position of the collar 3 after it has been formed, a radially circumferential web or partial regions of a web can be present in this contact region 5, for example. The piston blank shown in the single figure thus has a recess above the contact area 5, which is introduced in a forging process. Alternatively, it is also conceivable to produce a substantially cylindrical piston blank and a preferably radially circumferential recess, which forms the finished cooling channel after its closure by the collar or other means in the piston blank 1 by a forging process. This means that initially a substantially cylindrical piston blank is produced which does not yet have a recess which forms the later cooling channel. After the production of the cylindrical piston blank, a recess of the shape is introduced in a subsequent step such that the recess is achieved by this subsequent forging step. After this is done, can in one directly following step or in a later step, this recess are suitably closed to form the cooling channel. This means that the cooling channel is substantially completely closed, with the exception of the required at least one inlet and the at least one drain opening.
In der einzigen Figur ist somit der Kolbenrohling 1 dargestellt, der ursprünglich im Wesentlichen zylinderförmig gebildet war und bei dem nachaufeinanderfolgenden Schmiedevorgängen der Kragen 3 und die Ausnehmung oberhalb des Anlagebereiches 5 eingebracht worden ist. In the single figure, therefore, the piston blank 1 is shown, which was originally formed substantially cylindrical and has been introduced in the successive forging operations of the collar 3 and the recess above the contact area 5.
Nachdem diese Schritte durchgeführt worden sind, kann der Kolbenrohling in an sich bekannter weise weiterbearbeitet werden, so dass ein fertiger Kühlkanalkolben entsteht. Dies bezüglich wird auf [0014] bis [0017] der DE 10 2004 031 513 A1 und deren Figuren 2 - 4 verwiesen. After these steps have been carried out, the piston blank can be further processed in a conventional manner, so that a finished cooling channel piston is formed. With regard to this, reference is made to [0014] to [0017] of DE 10 2004 031 513 A1 and FIGS. 2-4 thereof.

Claims

P A T E N T A N S P R Ü C H E Vollständig im Schmiedeverfahren hergestellter Kolbenrohling eines Kühlkanalkolbens PATENT CLAIMS Piston blank of a cooling channel piston completely manufactured using the forging process
1 . 1 .
Verfahren zur Herstellung eines Kühlkanalkolbens, der einen Kühlkanal etwa im Bereich hinter einem Ringfeld aufweist, wobei ein Kolbenrohling in einem Schmiedeverfahren geformt wird, wobei ebenfalls im Schmiedeverfahren, insbesondere etwa im Bereich eines Feuersteges, zumindest ein umlaufender Bund geformt wird, wobei der Bund mittels einer Umformung derart umgeformt wird, dass die Ausnehmung zur Bildung des Kühlkanales von dem zumindest einen Bund verschlossen wird und der freie Endbereich des Bundes an dem Kolbenrohling zur Anlage gebracht wird, dadurch gekennzeichnet, dass die Ausnehmung durch ein Schmiedeverfahren eingebracht wird. Method for producing a cooling channel piston which has a cooling channel approximately in the area behind an annular field, wherein a piston blank is formed in a forging process, at least one circumferential collar also being formed in the forging process, in particular approximately in the area of a top land, the collar being formed by means of a Forming is formed in such a way that the recess to form the cooling channel is closed by the at least one collar and the free end region of the collar is brought into contact with the piston blank, characterized in that the recess is introduced by a forging process.
2. 2.
Kühlkanalkolben, hergestellt nach dem Verfahren gemäß einem der vorhergehenden Patentansprüche. Cooling channel piston, produced by the method according to one of the preceding claims.
PCT/EP2013/052297 2012-02-06 2013-02-06 Cooling channel piston blank completely produced in a forging method, and method for producing same WO2013117575A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012201729 2012-02-06
DE102012201729.1 2012-02-06

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WO2013117575A1 true WO2013117575A1 (en) 2013-08-15

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1452250A2 (en) 2003-03-01 2004-09-01 KS Kolbenschmidt GmbH Method of manufacturing a cooling duct piston with deformable flange
EP1614885A2 (en) * 2004-07-07 2006-01-11 Yuejun Huang One-piece steel piston
DE102005029417A1 (en) * 2004-06-28 2006-01-19 Riken Forge Co., Ltd. Method for producing a piston for an internal combustion engine
DE102004031513A1 (en) 2004-06-30 2006-01-26 Ks Kolbenschmidt Gmbh Method for producing a cooling channel piston for an internal combustion engine
DE102005021428A1 (en) * 2005-05-10 2006-11-16 Mahle International Gmbh Process to manufacture a forged piston by formation of a collar and folding over cooling channel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1452250A2 (en) 2003-03-01 2004-09-01 KS Kolbenschmidt GmbH Method of manufacturing a cooling duct piston with deformable flange
DE102005029417A1 (en) * 2004-06-28 2006-01-19 Riken Forge Co., Ltd. Method for producing a piston for an internal combustion engine
DE102004031513A1 (en) 2004-06-30 2006-01-26 Ks Kolbenschmidt Gmbh Method for producing a cooling channel piston for an internal combustion engine
EP1614885A2 (en) * 2004-07-07 2006-01-11 Yuejun Huang One-piece steel piston
DE102005021428A1 (en) * 2005-05-10 2006-11-16 Mahle International Gmbh Process to manufacture a forged piston by formation of a collar and folding over cooling channel

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Publication number Publication date
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