EP2846946A1 - Method for producing a piston with a cooling duct - Google Patents

Method for producing a piston with a cooling duct

Info

Publication number
EP2846946A1
EP2846946A1 EP13722739.3A EP13722739A EP2846946A1 EP 2846946 A1 EP2846946 A1 EP 2846946A1 EP 13722739 A EP13722739 A EP 13722739A EP 2846946 A1 EP2846946 A1 EP 2846946A1
Authority
EP
European Patent Office
Prior art keywords
piston
collar
cooling channel
recess
blank
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.)
Ceased
Application number
EP13722739.3A
Other languages
German (de)
French (fr)
Inventor
Ralf Buschbeck
Emmerich Ottliczky
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 EP2846946A1 publication Critical patent/EP2846946A1/en
Ceased legal-status Critical Current

Links

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/10—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass pistons
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49249—Piston making

Definitions

  • the invention relates to a method for producing a cooling channel piston and a cooling channel piston for internal combustion engines produced by the method.
  • a circumferential collar is also produced by forging at about the height of the first groove.
  • the geometric shape of this collar is chosen so that sufficient material is available to close the recess still to be introduced, which forms a later cooling channel.
  • a recess with its upper and lower vertex radius and the inner wall is machined into the piston blank by machining and the collar is brought into a shape that is suitable for closing the recess after forming the machined collar.
  • the invention is therefore based on the object to improve a corresponding method and a cooling channel piston produced thereafter.
  • the invention provides that the piston blank is still, as is known in the prior art, at least partially, preferably completely produced in a forging process with its functional elements.
  • the recess is not introduced into the piston blank by machining, but rather that the recess is likewise introduced in a forging method or a comparable method (such as, for example, a roll-pressing method, pressing or the like).
  • a forging method or a comparable method such as, for example, a roll-pressing method, pressing or the like.
  • the method is carried out such that with or by the introduction of the recess in the piston blank vorzugwetse simultaneously formed also the deformable radially encircling collar.
  • the radial circumferential and over the outer diameter of the Koibenrohlings projecting collar or collar can be reshaped so that it closes the recess, thereby forming a Kühikanal, which is arranged in the piston head, arises. Since the machining for producing the radial circumferential recess (which forms the subsequent cooling channel) is at least largely eliminated, the material structure obtained in the forging process is advantageously maintained and not weakened by machining as in the prior art.
  • a collar projecting beyond the outer diameter of the later cooling channel piston can be formed in a forging process, roll-pressing method or the like.
  • the forming of the collar can be done in the forging process, Wälzdschreibmaschine, calibration or the like. In the following, for example, the most important process steps for producing adekanalkoibens invention are listed.
  • the recess for later formation of the cooling channel in the forging method, Wälzdrückbacter or the like is introduced into the Kolbenrohiing, without thereby the collar is formed at the same time.
  • the position of the collar can be performed flush with the floor or flush with the upper edge of the shaft.
  • Ring grooves in particular for receiving piston rings, can be arranged on the formed collar and / or on the piston main body.
  • the annular grooves and at least one top land can be formed during forming of the collar to form the cooling channel or when closing the cooling channel. It is also conceivable to provide the production of grooves in the formation of the collar. After the formation of the cooling channel, the annular grooves and the at least one top land can be worked out by means of a turning process or the like from theharikanalkolbenschmiederohling.
  • the generation of the geometry of the cooling channel is at least partially, but preferably completely, before the closing of the cooling channel.
  • Suitable methods for producing the recess and closing the recess for forming the cooling channel are, for example, forging, rolling, rolling, Weizbine or comparable suitable methods.
  • Pistons produced in the forging process have a higher strength than pistons produced in a casting process, the process according to the invention maintains this advantage also in the area of the later cooling duct.
  • Cutting processes as known from the prior art, lead to a change in the material structure and thus to a weakening in the processing area, this is inventively avoided or minimized.
  • FIG. 1 shows a schematic representation of a
  • FIG. 2 shows a schematic representation of a
  • FIG. 3 shows a schematic representation of a cooling channel piston blank after the execution of the cooling channel
  • Figure 4 shows a schematic representation of a cooling channel piston after
  • Figure 1 shows in principle a piston blank 1, which is produced in a forging process.
  • functional elements of the later piston are like Plunger bottom, piston shafts, Kofbennaben, pin bore and the like introduced.
  • the later finished piston should be a cooling channel piston, according to FIG. 2 a recess A is introduced into the piston blank 1.
  • This radially encircling recess A is also introduced in a forging process, a Walzdrückmaschine or the like.
  • the method for introducing the recess A is carried out so that radially projecting beyond the outer diameter of the piston blank circumferential collar K (also known as collar) is formed.
  • the recess A is inserted into the piston blank 1 in a preferred embodiment, that when viewed in Figure 2 above the recess A, the collar K is formed This is possible, must (also with consideration of Figure 2) from above z. B. countered by a plate or the like.
  • the tool with which the radially encircling recess A is introduced into the piston blank works so that it displaces the material of the piston blank in the direction of Ko! Benhubachse and at the same time the radially encircling collar K takes a shape as they is shown in FIG.
  • a counterholder eg a plate
  • the radially encircling collar K is reshaped such that it closes the recess A.
  • These process steps can be taken from the prior art (EP 1 452 250 A2).
  • the initially outwardly projecting collar K has been folded over to close the recess A, it can be permanently connected with its peripheral lower edge with the piston blank, but need not.
  • the production of a cooling channel 5 on a cooling channel piston (2) is thus completed.
  • a land 3 and annular grooves 4 are formed in the Kolbenrohiing, so that a cooling channel piston 2 is formed.
  • there is a finishing of the so-steeped piston blank so that a ready piston with cooling channel for use in a cylinder of the internal combustion engine is formed.

Abstract

Method for producing a piston (2) with a cooling duct for an internal combustion engine, comprising a cooling duct (5) in the piston head thereof, wherein a piston blank (1) is provided and a collar (K), protruding beyond the outer diameter of the later piston (2) with a cooling duct, is formed on the piston blank (1) by forging, spin-bending or the like and, to form the cooling duct (5), a radially peripheral recess (A) is introduced into the piston blank (1), characterized in that the radially peripheral recess (A) is introduced into the piston blank (1) by forging, spin-bending or the like and, in a further method step, a forming operation is performed on the collar (K), which together with the peripheral recess (A) forms a cooling duct.

Description

B E S C H R E I B U N G  DESCRIPTION
Verfahren zur Herstellung eines Kühlkanalkolbens Method for producing a cooling channel piston
Die Erfindung betrifft ein Verfahren zur Herstellung eines Kühlkanalkolbens sowie einen nach dem Verfahren hergestellten Kühlkanalkolben für Brennkraftmaschinen. The invention relates to a method for producing a cooling channel piston and a cooling channel piston for internal combustion engines produced by the method.
Aus der EP 1 452 250 A2 ist es bekannt, einen Kolbenrohling zumindest teilweise, vorzugsweise insgesamt in einem Schmiedeverfahren herzustellen. Dabei werden die Funktionselemente des Kolbens wie Kolbenboden, Kolbenschäfte, Kolbennaben, Bolzenbohrung und dergleichen in den Kolbenrohling eingebracht. From EP 1 452 250 A2 it is known to produce a piston blank at least partially, preferably in total, in a forging process. In this case, the functional elements of the piston such as the piston head, piston shafts, piston hubs, pin bore and the like are introduced into the piston blank.
Im Stand der Technik wird im Bereich des Feuersteges, der beim fertigen Kolben vorhanden ist, in etwa auf der Höhe der ersten Nut ein umlaufender Bund ebenfalls im Schmiedeverfahren hergestellt. Die geometrische Form dieses Bundes wird dabei so gewählt, dass ausreichend Material zur Verfügung steht, um die noch einzubringende Ausnehmung, die einen späteren Kühlkanal bildet, zu verschließen. Oberhalb oder unterhalb des Bundes wird durch spanabhebende Bearbeitung eine Ausnehmung mit ihrem oberen und unteren Scheitelradius und der Innenwand in den Kolbenrohling eingearbeitet und der Bund in eine Form gebracht, die geeignet ist, die Ausnehmung nach Umformung des bearbeiteten Bundes zu verschließen. In the prior art, in the area of the land, which is present in the finished piston, a circumferential collar is also produced by forging at about the height of the first groove. The geometric shape of this collar is chosen so that sufficient material is available to close the recess still to be introduced, which forms a later cooling channel. Above or below the collar, a recess with its upper and lower vertex radius and the inner wall is machined into the piston blank by machining and the collar is brought into a shape that is suitable for closing the recess after forming the machined collar.
Hierbei ist es von Nachteil, mit Einbringung der Ausnehmung durch spanabhebende Bearbeitung das an sich ausreichend feste Gefüge, welches im Schmiedeverfahren erzielt wird, zu schwächen. Außerdem geht durch die spanabhebende Bearbeitung Material des Kolbenrohlings verloren, was negativ auf die Herstellkosten einwirkt. Der Erfindung liegt daher die Aufgabe zu Grunde, ein entsprechendes Verfahren und einen danach hergestellten Kühlkanalkolben zu verbessern. In this case, it is disadvantageous, with introduction of the recess by machining, to weaken the sufficiently strong structure which is obtained in the forging process. In addition, lost by the machining material of the piston blank, which adversely affects the manufacturing costs. The invention is therefore based on the object to improve a corresponding method and a cooling channel piston produced thereafter.
Die Erfindung sieht vor, dass der Kolbenrohling nach wie vor, wie es im Stand der Technik bekannt ist, mit seinen Funktionselementen zumindest teilweise, vorzugweise vollständig in einem Schmiedeverfahren hergestellt wird. Durch das Schmiedeverfahren wird ein Materialgefüge erzielt, welches den Anforderungen eines modernen Kühikanalkolbens für den Betrieb in der Brennkraftmaschine erfüllt The invention provides that the piston blank is still, as is known in the prior art, at least partially, preferably completely produced in a forging process with its functional elements. By forging a material structure is achieved, which meets the requirements of a modern Kühikanalkolbens for operation in the internal combustion engine
Erfindungsgemäß ist nun vorgesehen, dass die Ausnehmung nicht durch spanabhebende Bearbeitung in den Kolbenrohling eingebracht wird, sondern dass die Ausnehmung ebenfalls in einem Schmiedeverfahren oder einem vergleichbaren Verfahren (wie z. B. ein Walzdrückverfahren, Pressen oder dergleichen) eingebracht wird. Dadurch entsteht eine zumindest deutlich reduzierte Abfallmaterialmenge, was zu entsprechenden Aufwandsreduktionen führt, da höchstens diese stark reduzierte Abfallmaterialmenge recycelt werden muss. Außerdem ist von Vorteil, dass das Verfahren derart ausgeführt wird, dass mit oder durch die Einbringung der Ausnehmung in den Kolbenrohling vorzugwetse gleichzeitig auch der umformbare radial umlaufende Bund entsteht. Nach Herstellung eines solchen Kolbenrohlings kann der derart entstandene radialumlaufende und über den äußeren Durchmesser des Koibenrohlings überstehende Bund bzw. Kragen so umgeformt werden, dass er die Ausnehmung verschließt, wobei dadurch ein Kühikanal, der im Kolbenboden angeordnet ist, entsteht. Da die spanabhebende Bearbeitung zur Herstellung der radialumlaufenden Ausnehmung (die den späteren Kühlkanal bildet) zumindest weitgehend entfällt, wird in vorteilhafter Weise auch das im Schmiedeverfahren erzielte Materialgefüge beibehalten und eben nicht, wie im Stand der Technik, durch spanabhebende Bearbeitung geschwächt. According to the invention, it is now provided that the recess is not introduced into the piston blank by machining, but rather that the recess is likewise introduced in a forging method or a comparable method (such as, for example, a roll-pressing method, pressing or the like). This results in an at least significantly reduced amount of waste material, which leads to corresponding cost reductions, since at most this greatly reduced amount of waste material must be recycled. In addition, it is advantageous that the method is carried out such that with or by the introduction of the recess in the piston blank vorzugwetse simultaneously formed also the deformable radially encircling collar. After producing such a piston blank, the radial circumferential and over the outer diameter of the Koibenrohlings projecting collar or collar can be reshaped so that it closes the recess, thereby forming a Kühikanal, which is arranged in the piston head, arises. Since the machining for producing the radial circumferential recess (which forms the subsequent cooling channel) is at least largely eliminated, the material structure obtained in the forging process is advantageously maintained and not weakened by machining as in the prior art.
An dem Kolbenrohling kann ein über den äußeren Durchmesser des späteren Kühlkanalkolbens hinausragender Kragen in einem Schmiedeverfahren, Wälzdrückverfahren oder dergleichen gebildet werden. On the piston blank, a collar projecting beyond the outer diameter of the later cooling channel piston can be formed in a forging process, roll-pressing method or the like.
Das Umformen des Kragens kann im Schmiedeverfahren, Wälzdrückverfahren, Kalibrierverfahren oder dergleichen erfolgen. Im Folgenden sind beispielsweise die wichtigsten Verfahrensschritte zur Herstellung eines erfindungsgemäßen Kühlkanalkoibens aufgeführt. The forming of the collar can be done in the forging process, Wälzdrückverfahren, calibration or the like. In the following, for example, the most important process steps for producing a Kühlkanalkoibens invention are listed.
- Herstellung eines einteiligen Kühlkanalkoibenschmiederohlings ohne Hinterschnitt - Production of a one-piece Kühlkanalkoibenschmiederohlings without undercut
- Erzeugung eine über den Durchmesser des späteren Kühlkanalkolbens hinausragenden Kragens, vorzugsweise Erzeugung der Ausnehmung zur Bildung des späteren Kühlkanals im selben Verfahrensschritt - Generating a projecting beyond the diameter of the later cooling channel piston collar, preferably generating the recess to form the later cooling channel in the same process step
- Alternativ, Erzeugung der Ausnehmung in einem separaten Verfahrensschritt - Alternatively, generation of the recess in a separate process step
- Verschließen der Ausnehmung durch Umformen des Kragens zur Bildung eines Kühlkanals - Closing of the recess by forming the collar to form a cooling channel
- Einbringen der Ringnuten sowie Anformen des Feuerstegs - Introduction of the annular grooves and molding of the top land
In einer weiteren Ausgestaltung des erfindungsgemäßen Verfahrens wird die Ausnehmung zur späteren Ausbildung des Kühlkanales im Schmiedeverfahren, Wälzdrückverfahren oder dergleichen in den Kolbenrohiing eingebracht, ohne dass hierdurch zeitgleich der Kragen ausgebildet wird. In a further embodiment of the method according to the invention, the recess for later formation of the cooling channel in the forging method, Wälzdrückverfahren or the like is introduced into the Kolbenrohiing, without thereby the collar is formed at the same time.
Bei der Durchführung des erfindungsgemäßen Verfahrens kann die Position des Kragens bodenbündig oder bündig mit der Schaftoberkante ausgeführt werden. In carrying out the method according to the invention, the position of the collar can be performed flush with the floor or flush with the upper edge of the shaft.
Ringnuten, insbesondere zur Aufnahme von Kolbenringen, können am umgeformten Kragen und/oder am Kolbengrundkörper angeordnet sein. Ring grooves, in particular for receiving piston rings, can be arranged on the formed collar and / or on the piston main body.
Die Ringnuten sowie mindestens ein Feuersteg können beim Umformen des Kragens zur Bildung des Kühlkanales bzw. beim Verschließen des Kühlkanales ausgebildet werden. Auch ist es denkbar, bei der Ausbildung des Kragens bereits die Herstellung von Nuten vorzusehen. Nach der Ausbildung des Kühlkanales können die Ringnuten sowie der mindestens eine Feuersteg mit Hilfe eines Drehverfahrens oder dergleichen aus dem Kühlkanalkolbenschmiederohling herausgearbeitet werden. The annular grooves and at least one top land can be formed during forming of the collar to form the cooling channel or when closing the cooling channel. It is also conceivable to provide the production of grooves in the formation of the collar. After the formation of the cooling channel, the annular grooves and the at least one top land can be worked out by means of a turning process or the like from the Kühlkanalkolbenschmiederohling.
Die Erzeugung der Geometrie des Kühlkanals erfolgt zumindest teilweise, vorzugsweise jedoch ganz, vor dem Verschließen des Kühlkanals. Geeignete Verfahren zur Erzeugung der Ausnehmung und zum Verschließen der Ausnehmung zur Bildung des Kühlkanals sind beispielsweise Schmieden, Walzen, Rollieren, Wäizdrücken oder vergleichbare geeignete Verfahren. The generation of the geometry of the cooling channel is at least partially, but preferably completely, before the closing of the cooling channel. Suitable methods for producing the recess and closing the recess for forming the cooling channel are, for example, forging, rolling, rolling, Weizdrücken or comparable suitable methods.
Im Schmiedeverfahren hergestellte Kolben weisen eine höhere Festigkeit auf, als in einem Gussverfahren hergestellte Kolben, das erfindungsgemäße Verfahren erhält diesen Vorteil auch im Bereich des späteren Kühlkanals aufrecht. Spanabhebende Verfahren, wie aus dem Stand der Technik bekannt, führen zu einer Veränderung im Werkstoffgefüge und damit zu einer Schwächung im Bearbeitungsbereich, dies wird erfindungsgemäß vermieden bzw. minimiert. Pistons produced in the forging process have a higher strength than pistons produced in a casting process, the process according to the invention maintains this advantage also in the area of the later cooling duct. Cutting processes, as known from the prior art, lead to a change in the material structure and thus to a weakening in the processing area, this is inventively avoided or minimized.
Figur 1 zeigt eine schematische Darstellung eines FIG. 1 shows a schematic representation of a
Kühlkanalkolbenschmiederohlings,  Cooling channel piston forging blank,
Figur 2 zeigt eine schematische Darstellung eines FIG. 2 shows a schematic representation of a
Kühlkanalkoibenschmiederohlings nach dem Einbringen der Ausnehmung und gleichzeitiger Ausbildung des Kragens,  Kühlkanalkoibenschmiederohlings after the introduction of the recess and simultaneous formation of the collar,
Figur 3 zeigt eine schematische Darstellung eines Kühlkanalkolbenrohlings nach der Ausfertigung des Kühlkanais und FIG. 3 shows a schematic representation of a cooling channel piston blank after the execution of the cooling channel and
Figur 4 zeigt eine schematische Darstellung eines Kühlkanalkolbens nach dem Figure 4 shows a schematic representation of a cooling channel piston after
Einbringen der Ringnuten.  Introduction of the annular grooves.
Das erfindungsgemäße Verfahren ist prinzipiell in den Figuren 1 bis 4 dargestellt. Figur 1 zeigt prinzipiell einen Kolbenrohling 1 , der in einem Schmiedeverfahren hergestellt wird. Dabei werden Funktionselemente des späteren Kolbens wie Kolbenboden, Kolbenschäfte, Kofbennaben, Bolzenbohrung und dergleichen eingebracht. Da es sich bei dem späteren fertigen Kolben um einen Kühlkanaikolben handeln soll, wird entsprechend Figur 2 eine Ausnehmung A in den Kolbenrohling 1 eingebracht. Diese radial umlaufende Ausnehmung A wird ebenfalls in einem Schmiedeverfahren, einem Walzdrückverfahren oder dergleichen eingebracht. Dabei wird das Verfahren zum Einbringen der Ausnehmung A so durchgeführt, dass dabei radial über den äußeren Durchmesser des Kolbenrohlings abstehender umlaufender Kragen K (auch als Bund zu bezeichnen) entsteht. The inventive method is shown in principle in Figures 1 to 4. Figure 1 shows in principle a piston blank 1, which is produced in a forging process. In this case, functional elements of the later piston are like Plunger bottom, piston shafts, Kofbennaben, pin bore and the like introduced. Since the later finished piston should be a cooling channel piston, according to FIG. 2 a recess A is introduced into the piston blank 1. This radially encircling recess A is also introduced in a forging process, a Walzdrückverfahren or the like. In this case, the method for introducing the recess A is carried out so that radially projecting beyond the outer diameter of the piston blank circumferential collar K (also known as collar) is formed.
Gemäß Figur 2 wird in einer bevorzugten Ausführungsform die Ausnehmung A so in den Kolbenrohling 1 eingebracht, dass bei Betrachtung der Figur 2 oberhalb der Ausnehmung A der Kragen K entsteht Damit dies möglich ist, muss (ebenfalls bei Betrachtung der Figur 2) von oben z. B. durch eine Platte oder dergleichen gegengehalten werden. Das bedeutet, dass das Werkzeug, mit welchen die radial umlaufende Ausnehmung A in den Kolbenrohling eingebracht wird, so arbeitet, dass es das Material des Kolbenrohlings in Richtung der Ko!benhubachse verdrängt und dabei gleichzeitig der radial umlaufende Kragen K eine Form einnimmt, wie sie in Figur 2 gezeigt ist. Damit dabei die gewünschte Formgebung des Kragens K realisiert wird und das Material des Kolbenrohlings nicht nach oben weggedrückt wird, ist es erforderlich, an dieser Stelle einen Gegenhalter (z. B. eine Platte) einzusetzen, wobei dies in Figur 2 durch die drei nach unten gerichteten Pfeile angedeutet ist. According to Figure 2, the recess A is inserted into the piston blank 1 in a preferred embodiment, that when viewed in Figure 2 above the recess A, the collar K is formed This is possible, must (also with consideration of Figure 2) from above z. B. countered by a plate or the like. This means that the tool with which the radially encircling recess A is introduced into the piston blank, works so that it displaces the material of the piston blank in the direction of Ko! Benhubachse and at the same time the radially encircling collar K takes a shape as they is shown in FIG. In order to realize the desired shaping of the collar K and to prevent the material of the piston blank from being pushed upwards, it is necessary to insert a counterholder (eg a plate) at this location, this being shown in FIG directed arrows is indicated.
Nach dem der Kolbenrohling eine Form bekommen hat, wie sie prinzipiell in Figur 2 dargestellt ist, wird der radial umlaufende Kragen K so umgeformt, dass er die Ausnehmung A verschließt. Diese Verfahrensschritte können dem Stand der Technik (der EP 1 452 250 A2) entnommen werden. Nachdem der zunächst nach außen abstehende Kragen K umgeklappt worden ist, um die Ausnehmung A zu verschließen, kann er mit seiner umlaufenden unteren Kante mit dem Kolbenrohling unlösbar verbunden werden, muss es aber nicht. Die Herstellung eines Kühlkanals 5 an einem Kühlkanalkolben (2) ist somit abgeschlossen. Danach werden beispielsweise ein Feuersteg 3 sowie Ringnuten 4 in dem Kolbenrohiing ausgebildet, sodass ein Kühlkanalkolben 2 entsteht. Schließlich erfolgt noch eine Endbearbeitung des derart hergesteilten Kolbenrohlings, so dass ein betriebsfertiger Kolben mit Kühlkanal für den Einsatz in einem Zylinder der Brennkraftmaschine entsteht. After the piston blank has been given a shape, as shown in principle in FIG. 2, the radially encircling collar K is reshaped such that it closes the recess A. These process steps can be taken from the prior art (EP 1 452 250 A2). After the initially outwardly projecting collar K has been folded over to close the recess A, it can be permanently connected with its peripheral lower edge with the piston blank, but need not. The production of a cooling channel 5 on a cooling channel piston (2) is thus completed. Thereafter, for example, a land 3 and annular grooves 4 are formed in the Kolbenrohiing, so that a cooling channel piston 2 is formed. Finally, there is a finishing of the so-steeped piston blank, so that a ready piston with cooling channel for use in a cylinder of the internal combustion engine is formed.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
1 Kolbenrohling1 piston blank
2 Kolben2 pistons
3 Feuersteg3 lancet
4 Ringnut4 ring groove
5 Kühlkanal 5 cooling channel
A AusnehmungA recess
K Kragen K collar

Claims

P A T E N T A N S P R Ü C H E Verfahren zur Herstellung eines Kühlkanalkolbens PATENT APPLICATIONS Method of manufacturing a cooling channel piston
1. Verfahren zur Herstellung eines Kühlkanalkolbens (2) für eine 1. A method for producing a cooling channel piston (2) for a
Brennkraftmaschine, der in seinem Kolbenboden einen Kühlkanal (5) aufweist, wobei ein Kolbenrohling (1 ) bereitgestellt wird und an dem Kolbenrohling (1) ein über den äußeren Durchmesser des späteren Kühlkanalkolbens (2) Internal combustion engine having in its piston crown a cooling channel (5), wherein a piston blank (1) is provided and on the piston blank (1) over the outer diameter of the later cooling channel piston (2)
hinausragender Kragen (K) in einem Schmiedeverfahren, Wälzdrückverfahren oder dergleichen gebildet und zur Bildung des Kühlkanales (5) eine radial umlaufende Ausnehmung (A) in den Kolbenrohling (1) eingebracht wird, dadurch gekennzeichnet, dass die radial umlaufende Ausnehmung (A) im protruding collar (K) formed in a forging process, Wälzdrückverfahren or the like and for forming the cooling channel (5) a radially encircling recess (A) in the piston blank (1) is introduced, characterized in that the radially encircling recess (A) in
Schmiedeverfahren, Wäizdrückverfahren oder dergleichen in den Kolbenrohling (1) eingebracht wird und in einem weiteren Verfahrensschritt durch Umformen des Kragens (K) im Zusammenspiel mit der umlaufenden Ausnehmung (A) ein Kühlkanal gebildet wird. Forging method, Wäizdrückverfahren or the like in the piston blank (1) is introduced and in a further process step by forming the collar (K) in cooperation with the circumferential recess (A), a cooling channel is formed.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das Verfahren zum Einbringen der Ausnehmung (A) so durchgeführt wird, dass dabei auch der radial über den äußeren Durchmesser des Kolbenrohlings (1) abstehende umlaufende Kragen (K) entsteht. 2. The method according to claim 1, characterized in that the method for introducing the recess (A) is performed so that thereby also the radially over the outer diameter of the piston blank (1) projecting circumferential collar (K) is formed.
3. Verfahren nach Anspruch 1 oder 2 dadurch gekennzeichnet, dass das Umformen des Kragens (K) im Schmiedeverfahren, Wälzdrückverfahren, Kalibrierverfahren oder dergleichen erfolgt. 3. The method according to claim 1 or 2, characterized in that the forming of the collar (K) in the forging process, Wälzdrückverfahren, calibration or the like takes place.
4. Verfahren nach einem der vorhergehenden Ansprüche dadurch 4. The method according to any one of the preceding claims
gekennzeichnet, dass der Kragen (K) zur Ausbildung des Kühlkanais (5) an einem Anlagebereich zur Anlage gebracht wird. characterized in that the collar (K) for forming the cooling duct (5) is brought into contact with a contact area.
5. Verfahren nach einem der vorhergehenden Ansprüche dadurch 5. The method according to any one of the preceding claims
gekennzeichnet, dass der Kragen (K) zur Ausbildung des Kühlkanals an einem zumindest teilweise radial umlaufenden Steg zur Festlegung der Kragenposition nach dem Umformen zur Anlage gebracht wird. characterized in that the collar (K) is brought to form the cooling channel at an at least partially radially circumferential web for determining the collar position after forming to the plant.
6. Verfahren nach Anspruch 5 dadurch gekennzeichnet, dass der Kragen (K) nach dem Umformen am radial umlaufenden Steg unlösbar festgelegt wird. 6. The method according to claim 5, characterized in that the collar (K) is fixed inextricably after forming on the radially circumferential ridge.
7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch 7. The method according to any one of the preceding claims, characterized
gekennzeichnet, dass die Ausnehmung (A) im Schmiedeverfahren, characterized in that the recess (A) in the forging process,
Wälzdrückverfahren oder dergleichen in den Kolbenrohling (1) eingebracht wird, ohne dass hierdurch zeitgleich der Kragen (K) ausgebildet wird. Wälzdrückverfahren or the like in the piston blank (1) is introduced without thereby simultaneously the collar (K) is formed.
8. Verfahren nach einem der vorhergehenden Ansprüche, dadurch 8. The method according to any one of the preceding claims, characterized
gekennzeichnet, dass die Position des Kragens (K) bodenbündig oder bündig mit der Schaftoberkante ausgeführt wird. in that the position of the collar (K) is carried flush with the floor or flush with the upper edge of the shaft.
9. Kühlkanalkolben, hergestellt nach dem Verfahren nach einem der 9. cooling channel piston, prepared by the method according to one of
vorhergehenden Patentansprüche. previous claims.
10. Kühlkanalkolben nach Anspruch 9, dadurch gekennzeichnet, dass die Funktionselemente des späteren Kühlkanalkolbens Kolbenboden, Kolbenschäfte, Kolbennaben, Bolzenbohrungen und dergleichen umfassen. 10. cooling channel piston according to claim 9, characterized in that the functional elements of the later cooling channel piston piston crown, piston shafts, piston hubs, pin bores and the like.
EP13722739.3A 2012-05-11 2013-05-08 Method for producing a piston with a cooling duct Ceased EP2846946A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012207961 2012-05-11
PCT/EP2013/059657 WO2013167694A1 (en) 2012-05-11 2013-05-08 Method for producing a piston with a cooling duct

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EP2846946A1 true EP2846946A1 (en) 2015-03-18

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US (1) US20150107106A1 (en)
EP (1) EP2846946A1 (en)
JP (1) JP2015518784A (en)
CN (1) CN104284744B (en)
DE (1) DE102013208557A1 (en)
WO (1) WO2013167694A1 (en)

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WO2016179062A1 (en) 2015-05-01 2016-11-10 Ohio State Innovation Foundation Hot forming of cooling galleries in steel pistons
US10253722B2 (en) 2015-05-01 2019-04-09 Ks Kolbenschmidt Us, Inc. Methods for forging a piston blank
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CN115070252B (en) * 2022-06-22 2023-11-03 四川航天长征装备制造有限公司 Lock bottom welding joint

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JP2001087836A (en) * 1999-09-17 2001-04-03 Kobe Steel Ltd Special shaped ring
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JP2015518784A (en) 2015-07-06
CN104284744B (en) 2017-03-22
CN104284744A (en) 2015-01-14
DE102013208557A1 (en) 2013-11-14
US20150107106A1 (en) 2015-04-23
WO2013167694A1 (en) 2013-11-14

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