EP2763805B1 - Forging device for the production of a piston blank, and method for the production of the piston blank by means of said forging device - Google Patents

Forging device for the production of a piston blank, and method for the production of the piston blank by means of said forging device Download PDF

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Publication number
EP2763805B1
EP2763805B1 EP12791078.4A EP12791078A EP2763805B1 EP 2763805 B1 EP2763805 B1 EP 2763805B1 EP 12791078 A EP12791078 A EP 12791078A EP 2763805 B1 EP2763805 B1 EP 2763805B1
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EP
European Patent Office
Prior art keywords
forging
piston
piston blank
cavity
billet
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EP12791078.4A
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German (de)
French (fr)
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EP2763805A1 (en
Inventor
Roland GRUNERT
Jürgen Friedrich
Timo Seng
Wolfgang Janisch
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Mahle International GmbH
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Mahle International GmbH
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/02—Dies or mountings therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/02—Dies or mountings therefor
    • B21J13/025—Dies with parts moving along auxiliary lateral directions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B21J5/025—Closed die forging
    • 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 forging apparatus for producing a piston blank, which has a piston crown and shaft elements attached to the piston crown, which are connected to one another via box walls, with a forging shape having a substantially cylindrical and the radial outer surface of the piston blank corresponding through recess, with a the one Side of the recess bounding forging, and with a center punch, which consists of a mandrel with a tapered approach attached thereto with a corresponding shape of the inner surface of the piston blank, and which is insertable via the other side of the recess with the approach in the forging ,
  • a forging apparatus for producing a piston blank and a method for forging the piston blank using the forging apparatus of the aforementioned type are known from Japanese Application JP 2000 005840 A known.
  • the disadvantage here is that the forging consists of two halves, which are pulled apart after completion of the forging process in the radial direction to eject the piston blank can.
  • Object of the present invention is to make a forging device such that in the top of the upsetting radially outward of the box walls, a circumferential cooling bag is formed. It is another object of the invention to provide a method for forging the piston blank using the forging, in which in the top of the upsetting radially outside the box walls, a circumferential cooling bag is formed.
  • the forging for forming the radially outer surfaces of the box walls and for forming a radially outside of the box walls arranged in the piston head circulating cooling bag has two side jaws, which in the forging device obliquely to the longitudinal axis of the forging in obliquely lying arrows are movably mounted, wherein the oblique arrows with the longitudinal axis of the forging include an acute angle.
  • Fig. 1 shows a forging apparatus 1 for press forging, which has a Gesenkmantel 2, which is slidably connected in the direction of the longitudinal axis 3 with a die plate 4.
  • a Gesenkmantel 2 In the middle of the Gesenkmantel 2 has a round opening 6, in which a Gesenkbuchse 7 is arranged, whose function is to lead a forging base 8 and a center punch 14.
  • the outer diameter of the piston blank 28 (via the inner diameter of the die sleeve 7) (FIG. Fig. 6 ).
  • the Gesenkmantel 2, the die plate 4 and the female socket 7 in this case give the lower die. 5
  • the forging base 8 located in the interior of the die sleeve 7 rests on a die plate 4.
  • a Stauchling 9 from which the piston blank 28 ( Fig. 6 ) will be produced.
  • the Stauchling 9 consists of AlSi12CuMgNi or AlSi12Cu3Ni2Mg and has a temperature of 480 ° C.
  • the other parts of the forging apparatus 1, namely side jaws 10 and 11 and hold-down 12 and 13, in addition to the center punch 14 at an in Fig. 1 Attached not shown hydraulic device. While the hold-down 12, 13 and the center punch 14 are movably mounted in the direction of parallel to the longitudinal axis 3 of the forging device 1 arrow 15, the side jaws 10 and 11 are movably mounted in the direction of the oblique arrows 16 and 17, wherein the oblique arrows 16 and 17 with the longitudinal axis 3 an angle ⁇ 20 ° and converge toward each other in the direction of the lower die 5.
  • the side jaws 10, 11 and the center punch 14 in this case form the upper die 18, which is formed in three parts in the present embodiment.
  • the side jaws 10, 11, the hold-down 12, 13 and the center punch 14 are arranged symmetrically to the longitudinal axis 3 of the forging apparatus 1.
  • the hold-downs 12 and 13 are moved in the direction of the arrow 15 down to the side jaws 10 and 11 ( Fig. 2 ) until they rest on the side jaws 10 and 11, as shown in FIG Fig. 3 is shown.
  • the Gesenkmantel 2 is then together with the side jaws 10 and 11 and the downholders 12 and 13 in the direction of the parallel to the longitudinal axis 3 of the forging device 1 lying arrow 19 (FIGS. Fig. 2 ) moves on the die plate 4 until the Gesenkmantel 2 rests on the die plate 4, as in Fig. 3 is shown.
  • a circumferential cooling pocket 20 is formed by the side jaws 10 and 11 in the Stauchling 9, the in Fig. 6 easy to recognize.
  • step ( Fig. 3 ) of the center punch 14 in the direction of the arrow 15 to the forging apparatus 1 moves, wherein the mandrel 21 enters the opening 22 between the side jaws 10 and 11 and, as it is in Fig. 4 is shown, insofar as acting on the Stauchling 9 that in this case between the mandrel 21 of the center punch 14 and the side jaws 10, 11, the shaft members 23 and the box walls 27, 27 'are formed ( Fig. 6 ).
  • the mandrel 21 has a conically downwardly tapering projection 24, which, together with the equally downwardly tapered inner walls 25, 26 of the side jaws 10, 11 ensure that, as it is in Fig. 6 is shown, the box walls 27, 27 'of the piston blank 28 are inclined and taper towards the piston head 29 of the piston blank 28 out.
  • the outer surface of the piston blank 28 is formed by a forging shape consisting of the side jaws 10, 11 and the die sleeve 7.
  • the radially outer, cylindrical lateral surface 30 of the piston crown 29 is in this case formed by the die sleeve 7, while for the formation of the radially outer surfaces of the box walls 27, 27 'and the circulating cooling bag 20, the side jaws 10, 11 are responsible.
  • Fig. 6 is the piston blank 28 made of aluminum produced in the context of the forging process described above.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Description

Die Erfindung betrifft eine Schmiedevorrichtung zur Herstellung eines Kolbenrohlings, der einen Kolbenboden und am Kolbenboden angebrachte Schaftelemente aufweist, die über Kastenwände miteinander verbunden sind, mit einer Schmiedeform mit einer im Wesentlichen zylinderförmigen und der radialen Außenfläche des Kolbenrohlings entsprechenden, durchgehenden Ausnehmung, mit einem die eine Seite der Ausnehmung begrenzende Schmiedeboden, und mit einem Mittelstempel, der aus einem Dorn mit einem daran angebrachte, konisch zulaufenden Ansatz mit einer der Innenfläche des Kolbenrohlings entsprechenden Form besteht, und der über die andere Seite der Ausnehmung mit dem Ansatz voran in die Schmiedeform einführbar ist.The invention relates to a forging apparatus for producing a piston blank, which has a piston crown and shaft elements attached to the piston crown, which are connected to one another via box walls, with a forging shape having a substantially cylindrical and the radial outer surface of the piston blank corresponding through recess, with a the one Side of the recess bounding forging, and with a center punch, which consists of a mandrel with a tapered approach attached thereto with a corresponding shape of the inner surface of the piston blank, and which is insertable via the other side of the recess with the approach in the forging ,

Die Erfindung betrifft weiterhin ein Verfahren zum Schmieden eines Kolbenrohlings, der einen Kolbenboden, und am Kolbenboden angebrachte Schaftelemente aufweist, die über Kastenwände miteinander verbunden sind mit den folgenden Verfahrensschritten:

  • Einbringen eines erhitzten Stauchlings, aus dem der Kolbenrohling geschmiedet werden soll, derart in eine im Wesentlichen zylinderförmige Ausnehmung einer Schmiedevorrichtung, dass er auf einem auf der einen Seite der Ausnehmung angeordneten Schmiedeboden zu liegen kommt,
  • Einführen eines Mittelstempels, der aus einem Dorn mit einem daran angebrachte, konisch zulaufenden Ansatz mit einer der Innenfläche des Kolbenrohlings entsprechenden Form besteht, mit dem Ansatz voran in die andere Seite der Ausnehmung, wobei der Ansatz auf den Stauchling einwirkt und sich dabei die Kastenwände und die damit verbundenen Schaftelemente ausbilden
  • Herausziehen des Mittelstempels aus der Ausnehmung der Schmiedevorrichtung,
  • Auswerfen des Kolbenrohlings.
The invention further relates to a method for forging a piston blank, which has a piston head, and shaft elements attached to the piston head, which are connected to each other via box walls with the following method steps:
  • Introducing a heated upsetting part from which the piston blank is to be forged, into a substantially cylindrical recess of a forging device such that it comes to rest on a forging ground arranged on one side of the recess,
  • Inserting a center punch, which consists of a mandrel with a tapered approach attached thereto with a corresponding shape of the inner surface of the piston blank, with the approach ahead in the other side of the recess, wherein the approach acts on the Stauchling and thereby the box walls and form the associated shaft elements
  • Extracting the central punch from the recess of the forging device,
  • Ejecting the piston blank.

Eine Schmiedevorrichtung zur Herstellung eines Kolbenrohlings und ein Verfahren zum Schmieden des Kolbenrohlings unter Verwendung der Schmiedevorrichtung der eingangs genannten Art sind aus der Japanischen Anmeldeschrift JP 2000 005840 A bekannt. Nachteilig ist hierbei, dass die Schmiedeform aus zwei Hälften besteht, die nach Beendigung des Schmiedeprozesses in radialer Richtung auseinandergezogen werden, um den Kolbenrohling auswerfen zu können. Unter Verwendung der bekannten Schmiedeform ist es unmöglich, in die Oberseite des Stauchlings radial außerhalb der Kastenwände umlaufende Kühltaschen einzuformen, denn diese Kühltaschen würden das Auseinanderziehen der Schmiedeform in radialer Richtung verhindern.A forging apparatus for producing a piston blank and a method for forging the piston blank using the forging apparatus of the aforementioned type are known from Japanese Application JP 2000 005840 A known. The disadvantage here is that the forging consists of two halves, which are pulled apart after completion of the forging process in the radial direction to eject the piston blank can. Using the known forging shape, it is impossible to mold circulating coolers in the top of the upsetting radially outward of the box walls, because these coolers would prevent the forging shape from being pulled apart in the radial direction.

Aufgabe der vorliegenden Erfindung ist es, eine Schmiedevorrichtung derart zu gestalten, dass in die Oberseite des Stauchlings radial außerhalb der Kastenwände eine umlaufende Kühltasche einformbar ist. Weiterhin ist es Aufgabe der Erfindung, ein Verfahren zum Schmieden des Kolbenrohlings unter Verwendung der Schmiedevorrichtung anzugeben, bei dem in die Oberseite des Stauchlings radial außerhalb der Kastenwände eine umlaufende Kühltasche eingeformt wird.Object of the present invention is to make a forging device such that in the top of the upsetting radially outward of the box walls, a circumferential cooling bag is formed. It is another object of the invention to provide a method for forging the piston blank using the forging, in which in the top of the upsetting radially outside the box walls, a circumferential cooling bag is formed.

Gelöst werden diese Aufgaben zum einen dadurch, dass die Schmiedeform zur Formung der radial äußeren Flächen der Kastenwände und zur Formung einer radial außerhalb der Kastenwände in den Kolbenboden angeordneten, umlaufende Kühltasche zwei Seitenbacken aufweist, die in der Schmiedevorrichtung schräg zur Längsachse der Schmiedevorrichtung in durch schräg liegende Pfeile darstellbare Richtungen beweglich gelagert sind, wobei die schräg liegenden Pfeile mit der Längsachse der Schmiedevorrichtung einen spitzen Winkel einschließen.These objects are achieved on the one hand by the fact that the forging for forming the radially outer surfaces of the box walls and for forming a radially outside of the box walls arranged in the piston head, circulating cooling bag has two side jaws, which in the forging device obliquely to the longitudinal axis of the forging in obliquely lying arrows are movably mounted, wherein the oblique arrows with the longitudinal axis of the forging include an acute angle.

Beim Schmieden des Kolbenrohlings unter Verwendung der Schmiedevorrichtung wird diese Aufgabe zum anderen durch die folgenden Verfahrensschritte gelöst:

  • Einformen einer umlaufenden Kühltasche in den Stauchling unter Verwendung zweier Seitenbacken, deren Innenflächen die Form der radialen Außenflächen der Kastenwände aufweisen, und die in der Schmiedevorrichtung schräg zur Längsachse der Schmiedevorrichtung in durch schräg liegende Pfeile darstellbare Richtungen beweglich gelagert sind, wobei die schräg liegenden Pfeile mit der Längsachse der Schmiedevorrichtung einen Winkel von α ≤ 25° einschließen und in Richtung des Schmiedebodens aufeinander zulaufen, indem die Seitenbacken auf den Stauchling gepresst werden,
  • Herausziehen der Seitenbacken aus der Schmiedevorrichtung in zu den schräg liegenden Pfeilen entgegengesetzte Richtungen.
When forging the piston blank using the forging apparatus, this object is achieved, on the other hand, by the following method steps:
  • Forming a circulating cooling bag in the Stauchling using two side jaws whose inner surfaces have the shape of the radially outer surfaces of the box walls, and are mounted in the forging device obliquely to the longitudinal axis of the forging device in directions representable by oblique arrows movable directions, wherein the oblique arrows with enclose the longitudinal axis of the forging machine at an angle of α ≤ 25 ° and converge towards the forging floor by pressing the side jaws onto the stuffing box,
  • Pull out the side jaws from the forging in opposite directions to the oblique arrows.

Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Advantageous embodiments of the invention are the subject of the dependent claims.

Ein Ausführungsbeispiel der Erfindung wird im Folgenden anhand der Zeichnungen beschrieben. Es zeigen

Fig. 1
Teile einer Schmiedevorrichtung in Ausgangsposition mit einem eingelegten Stauchling aus Aluminium, aus dem im Laufe des Schmiedeprozesses ein Kolbenrohling hergestellt wird,
Fig. 2 bis 5
in der Schmiedevorrichtung ablaufende Prozessschritte zur Herstellung des Kolbens und
Fig. 6
einen Schnitt durch den in der Schmiedevorrichtung hergestellten Kolben.
An embodiment of the invention will be described below with reference to the drawings. Show it
Fig. 1
Parts of a forging device in the starting position with an inserted aluminum upsetting, from which a piston blank is produced in the course of the forging process,
Fig. 2 to 5
in the forging machine running process steps for the production of the piston and
Fig. 6
a section through the piston produced in the forging apparatus.

Fig. 1 zeigt eine Schmiedevorrichtung 1 zum Pressschmieden, die einen Gesenkmantel 2 aufweist, der in Richtung der Längsachse 3 verschiebbar mit einer Gesenkplatte 4 verbunden ist. Mittig weist der Gesenkmantel 2 eine runde Öffnung 6 auf, in der eine Gesenkbuchse 7 angeordnet ist, deren Funktion darin besteht, einen Schmiedeboden 8 und einen Mittelstempel 14 zu führen. Außerdem wird über den Innendurchmesser der Gesenkbuchse 7 der Außendurchmesser des Kolbenrohlings 28 (Fig. 6) festgelegt. Der Gesenkmantel 2, die Gesenkplatte 4 und die Gesenkbuchse 7 ergeben hierbei das Untergesenk 5. Fig. 1 shows a forging apparatus 1 for press forging, which has a Gesenkmantel 2, which is slidably connected in the direction of the longitudinal axis 3 with a die plate 4. In the middle of the Gesenkmantel 2 has a round opening 6, in which a Gesenkbuchse 7 is arranged, whose function is to lead a forging base 8 and a center punch 14. In addition, the outer diameter of the piston blank 28 (via the inner diameter of the die sleeve 7) (FIG. Fig. 6 ). The Gesenkmantel 2, the die plate 4 and the female socket 7 in this case give the lower die. 5

Der sich im Inneren der Gesenkbuchse 7 befindliche Schmiedeboden 8 liegt auf einer Gesenkplatte 4 auf. Auf dem Schmiedeboden 8 lagert ein Stauchling 9, aus dem der Kolbenrohling 28 (Fig. 6) hergestellt wird. Der Stauchling 9 besteht aus AlSi12CuMgNi oder aus AlSi12Cu3Ni2Mg und hat eine Temperatur von 480 °C.The forging base 8 located in the interior of the die sleeve 7 rests on a die plate 4. On the forging bottom 8 a Stauchling 9, from which the piston blank 28 ( Fig. 6 ) will be produced. The Stauchling 9 consists of AlSi12CuMgNi or AlSi12Cu3Ni2Mg and has a temperature of 480 ° C.

Die weiteren Teile der Schmiedevorrichtung 1, nämlich Seitenbacken 10 und 11 und Niederhalter 12 und 13, sind neben dem Mittelstempel 14 an einer in Fig. 1 nicht dargestellten Hydraulikvorrichtung befestigt. Während an der Hydraulikvorrichtung die Niederhalter 12, 13 und der Mittelstempel 14 in Richtung des parallel zur Längsachse 3 der Schmiedevorrichtung 1 liegenden Pfeiles 15 beweglich gelagert sind, sind die Seitenbacken 10 und 11 in Richtung der schräg liegenden Pfeile 16 und 17 beweglich gelagert, wobei die schräg liegenden Pfeile 16 und 17 mit der Längsachse 3 einen Winkel α = 20° einschließen und in Richtung des Untergesenks 5 aufeinander zulaufen. Die Seitenbacken 10, 11 und der Mittelstempel 14 bilden hierbei das Obergesenk 18, das im vorliegenden Ausführungsbeispiel dreiteilig ausgebildet ist. Die Seitenbacken 10, 11, die Niederhalter 12, 13 und der Mittelstempel 14 sind symmetrisch zu Längsachse 3 der Schmiedevorrichtung 1 angeordnet.The other parts of the forging apparatus 1, namely side jaws 10 and 11 and hold-down 12 and 13, in addition to the center punch 14 at an in Fig. 1 Attached not shown hydraulic device. While the hold-down 12, 13 and the center punch 14 are movably mounted in the direction of parallel to the longitudinal axis 3 of the forging device 1 arrow 15, the side jaws 10 and 11 are movably mounted in the direction of the oblique arrows 16 and 17, wherein the oblique arrows 16 and 17 with the longitudinal axis 3 an angle α = 20 ° and converge toward each other in the direction of the lower die 5. The side jaws 10, 11 and the center punch 14 in this case form the upper die 18, which is formed in three parts in the present embodiment. The side jaws 10, 11, the hold-down 12, 13 and the center punch 14 are arranged symmetrically to the longitudinal axis 3 of the forging apparatus 1.

Im Rahmen des Verfahrens zum Schmieden des Kolbenrohlings 28 werden zunächst die Seitenbacken 10 und 11 in Richtung der schräg liegenden Pfeile 16 und 17 (Fig. 1) soweit nach unten bewegt, bis sie auf dem Gesenkmantel 2 aufliegen, wie es in Fig. 2 dargestellt ist.As part of the process for forging the piston blank 28, the side cheeks 10 and 11 in the direction of the oblique arrows 16 and 17 (FIG. Fig. 1 ) so far down until they rest on the Gesenkmantel 2, as in Fig. 2 is shown.

Im Anschluss daran werden die Niederhalter 12 und 13 in Richtung des Pfeiles 15 nach unten auf die Seitenbacken 10 und 11 zu bewegt (Fig. 2), bis sie auf den Seitenbacken 10 und 11 aufliegen, wie es in Fig. 3 dargestellt ist. Der Gesenkmantel 2 wird dann gemeinsam mit den Seitenbacken 10 und 11 und den Niederhaltern 12 und 13 in Richtung des parallel zur Längsachse 3 der Schmiedevorrichtung 1 liegenden Pfeiles 19 (Fig. 2) auf die Gesenkplatte 4 zu bewegt, bis der Gesenkmantel 2 auf der Gesenkplatte 4 aufliegt, wie es in Fig. 3 dargestellt ist. Hierbei wird von den Seitenbacken 10 und 11 in den Stauchling 9 eine umlaufende Kühltasche 20 eingeformt, die in Fig. 6 gut zu erkennen ist.Subsequently, the hold-downs 12 and 13 are moved in the direction of the arrow 15 down to the side jaws 10 and 11 ( Fig. 2 ) until they rest on the side jaws 10 and 11, as shown in FIG Fig. 3 is shown. The Gesenkmantel 2 is then together with the side jaws 10 and 11 and the downholders 12 and 13 in the direction of the parallel to the longitudinal axis 3 of the forging device 1 lying arrow 19 (FIGS. Fig. 2 ) moves on the die plate 4 until the Gesenkmantel 2 rests on the die plate 4, as in Fig. 3 is shown. Here, a circumferential cooling pocket 20 is formed by the side jaws 10 and 11 in the Stauchling 9, the in Fig. 6 easy to recognize.

Im folgenden Verfahrensschritt wird (Fig. 3) der Mittelstempel 14 in Richtung des Pfeiles 15 auf die Schmiedevorrichtung 1 zu bewegt, wobei der Dorn 21 in die Öffnung 22 zwischen den Seitenbacken 10 und 11 einfährt und, wie es in Fig. 4 dargestellt ist, insoweit auf den Stauchling 9 einwirkt, dass hierbei zwischen dem Dorn 21 des Mittelstempels 14 und den Seitenbacken 10, 11 die Schaftelemente 23 und die Kastenwände 27, 27' ausgebildet werden (Fig. 6).In the following process step ( Fig. 3 ) of the center punch 14 in the direction of the arrow 15 to the forging apparatus 1 moves, wherein the mandrel 21 enters the opening 22 between the side jaws 10 and 11 and, as it is in Fig. 4 is shown, insofar as acting on the Stauchling 9 that in this case between the mandrel 21 of the center punch 14 and the side jaws 10, 11, the shaft members 23 and the box walls 27, 27 'are formed ( Fig. 6 ).

Der Dorn 21 weist hierzu einen konisch nach unten zulaufenden Ansatz 24 auf, der gemeinsam mit den gleichermaßen nach unten konisch zulaufenden Innenwänden 25, 26 der Seitenbacken 10, 11 dafür sorgen, dass, wie es in Fig. 6 dargestellt ist, die Kastenwände 27, 27' des Kolbenrohlings 28 schräg stehen und zum Kolbenboden 29 des Kolbenrohlings 28 hin konisch zulaufen.For this purpose, the mandrel 21 has a conically downwardly tapering projection 24, which, together with the equally downwardly tapered inner walls 25, 26 of the side jaws 10, 11 ensure that, as it is in Fig. 6 is shown, the box walls 27, 27 'of the piston blank 28 are inclined and taper towards the piston head 29 of the piston blank 28 out.

Die Außenfläche des Kolbenrohlings 28 wird von einer Schmiedeform geformt, die aus den Seitenbacken 10, 11 und der Gesenkbuchse 7 besteht. Die radial äußere, zylinderförmige Mantelfläche 30 des Kolbenbodens 29 wird hierbei von der Gesenkbuchse 7 geformt, während für die Formung der radial äußeren Flächen der Kastenwände 27, 27' und der umlaufenden Kühltasche 20 die Seitenbacken 10, 11 verantwortlich sind.The outer surface of the piston blank 28 is formed by a forging shape consisting of the side jaws 10, 11 and the die sleeve 7. The radially outer, cylindrical lateral surface 30 of the piston crown 29 is in this case formed by the die sleeve 7, while for the formation of the radially outer surfaces of the box walls 27, 27 'and the circulating cooling bag 20, the side jaws 10, 11 are responsible.

In Fig. 5 sind die Schritte beim Öffnen der Schmiedevorrichtung 1 nach Abschluss des Schmiedevorganges dargestellt:

1a:
Der Mittelstempel 14 fährt nach oben.
2a:
Die Niederhalter 12, 13 fahren nach oben.
3a:
Der Gesenkmantel 2 fährt nach oben, wobei die Gesenkplatte 4 stehen bleibt.
4a:
Die Seitenbacken 10, 11 werden relativ zum Kolbenrohling 28 schräg nach oben abgezogen.
5a:
Der Kolbenrohling 28 wird ausgeworfen.
In Fig. 5 the steps in opening the forging apparatus 1 are shown after completion of the forging process:
1a:
The center stamp 14 moves up.
2a:
The hold-downs 12, 13 go up.
3a:
The Gesenkmantel 2 moves upward, the die plate 4 stops.
4a:
The side jaws 10, 11 are withdrawn obliquely upward relative to the piston blank 28.
5a:
The piston blank 28 is ejected.

In Fig. 6 ist der im Rahmen des oben beschriebenen Schmiedeprozesses hergestellte Kolbenrohling 28 aus Aluminium dargestellt. Neben einer eingeschmiedeten, umlaufenden Kühltasche 20 weist der Kolbenrohling 28 in Richtung Kolbenboden 29 aufeinander zulaufende, schräge Kastenwände 27, 27' auf, die die Schaftelemente 23 miteinander verbinden, und die den Vorteil haben, dass ein aus dem Kolbenrohling 28 unter Anwendung spanender Fertigungsverfahren hergestellter Kolben sehr viel höher belastbar ist, als ein Kolben mit parallel liegenden Kastenwänden.In Fig. 6 is the piston blank 28 made of aluminum produced in the context of the forging process described above. In addition to a forged, circulating cooling bag 20, the piston blank 28 in the direction of the piston head 29 converging, sloping box walls 27, 27 ', which connect the shaft members 23 together, and which have the advantage that a piston produced from the piston blank 28 using machining manufacturing process much higher is resilient than a piston with parallel box walls.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1a, 2a, 3a, 4a, 5a1a, 2a, 3a, 4a, 5a
Schritte beim Öffnen der Schmiedevorrichtung 1Steps in opening the forging device 1
11
Schmiedevorrichtungforge
22
GesenkmantelGesenkmantel
33
Längsachselongitudinal axis
44
Gedenkplattecommemorative plate
55
Untergesenklower die
66
Öffnungopening
77
GesenkbuchseGesenkbuchse
88th
Schmiedebodenwrought floor
99
Stauchlingupsetting Ling
10, 1110, 11
Seitenbackenside jaws
12, 1312, 13
NiederhalterStripper plate
1414
MittelstempelFood stamps
15, 16,15, 16,
schräg liegende Pfeileoblique arrows
1717
Pfeilarrow
1818
Obergesenkupper die
1919
Pfeilarrow
2020
Kühltaschecool bag
2121
Dorn des Mittelstempels 14Thorn of the center temple 14
2222
Öffnung zwischen den Seitenbacken 10, 11Opening between the side jaws 10, 11
2323
Schaftelementshaft element
2424
Ansatz des Doms 21Approach of the dome 21
25, 2625, 26
Innenwände der Seitenbacken 10, 11Inner walls of the side jaws 10, 11
27, 27'27, 27 '
Kastenwandchest wall
2828
Kolbenrohlingpiston blank
2929
Kolbenbodenpiston crown
3030
radial äußere Mantelfläche des Kolbenbodens 29radially outer surface of the piston crown 29th

Claims (6)

  1. Forging apparatus (1) for producing a piston blank (28) which has a piston crown (29) and skirt elements (23), which are fitted on the piston crown (29) and are connected to one another via box walls (27, 27'),
    - having a forging mould (7, 10, 11) with an essentially cylindrical, continuous cavity corresponding to the radial outer surface of the piston blank (28),
    - having a forging base (8), which bounds one side of the cavity, and
    - having a central punch (14), which comprises a mandrel (21) with a conically tapering extension (24) fitted thereon, and shaped in a manner corresponding to the inner surface of the piston blank, and which can be introduced into the forging mould (7, 10, 11), via the other side of the cavity, with the extension (24) in front,
    characterized in that the forging mould (7, 10, 11), for the purpose of forming the radially outer surfaces of the box walls (27, 27') and for the purpose of forming an encircling cooling pocket (20) arranged in the piston crown (29), radially outside the box walls (27, 27'), has two side jaws (10, 11), which are mounted in the forging apparatus (1) such that they can be moved obliquely in relation to the longitudinal axis (3) of the forging apparatus (1), in directions which can be illustrated by obliquely located arrows (16, 17), wherein the obliquely located arrows (16, 17) enclose an angle of α ≤ 25° with the longitudinal axis (3) of the forging apparatus (1) and run towards one another in the direction of the forging base (8).
  2. Forging apparatus (2) according to Claim 1, characterized in that the forging mould (7, 10, 11) has a tubular die bushing (7), which is arranged on the one side of the cavity and is intended for forming the radially outer lateral surface (30) of the piston crown (29).
  3. Method of forging a piston blank (28) which has a piston crown (29) and skirt elements (23), which are fitted on the piston crown (29) and are connected to one another via box walls (27, 27'), using a forging apparatus (1) according to Claim 1, having the following method steps:
    - introducing a heated billet (9), from which the piston blank (28) is to be forged, into an essentially cylindrical cavity of a forging apparatus (1) such that it ends up located on a forging base (8), which is arranged on the one side of the cavity,
    - forming an encircling cooling pocket (20) in the billet (9) using two side jaws (10, 11), of which the inner surfaces have the shape of the radial outer surfaces of the box walls (27, 27') and which are mounted in the forging apparatus (1) such that they can be moved obliquely in relation to the longitudinal axis (3) of the forging apparatus (1), in directions which can be illustrated by obliquely located arrows (16, 17), wherein the obliquely located arrows (16, 17) enclose an angle of at 25° with the longitudinal axis (3) of the forging apparatus (1) and run towards one another in the direction of the forging base (8), by virtue of the side jaws (10, 11) being pressed onto the billet (9),
    - introducing a central punch (14), which comprises a mandrel (21) with a conically tapering extension (24) fitted thereon, and shaped in a manner corresponding to the inner surface of the piston blank, into the other side of the cavity with the extension (24) in front, wherein the extension (24) acts on the billet (9), and the box walls (27, 27'), and the skirt elements (23) connected thereto, form in the process,
    - pulling the central punch (14) out of the cavity of the forging apparatus (1),
    - pulling the side jaws (10, 11) out of the forging apparatus (1) in directions counter to the obliquely located arrows (16, 17), and
    - ejecting the piston blank (28).
  4. Method of forging a piston blank (28) according to Claim 3, characterized in that the billet (9) consists of an aluminium alloy and is heated to a temperature of 480°C.
  5. Method of forging a piston blank (28) according to Claim 4, characterized in that the alloy Sil2CuMgNi is selected for the billet (9).
  6. Method of forging a piston blank (28) according to Claim 4, characterized in that the alloy ALSi12Cu3Ni2Mg is selected for the billet (9).
EP12791078.4A 2011-10-07 2012-10-05 Forging device for the production of a piston blank, and method for the production of the piston blank by means of said forging device Active EP2763805B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011115048A DE102011115048A1 (en) 2011-10-07 2011-10-07 A forging apparatus for producing a piston blank and a method for producing the piston blank using the forging apparatus
PCT/DE2012/000969 WO2013050020A1 (en) 2011-10-07 2012-10-05 Forging device for the production of a piston blank, and method for the production of the piston blank by means of said forging device

Publications (2)

Publication Number Publication Date
EP2763805A1 EP2763805A1 (en) 2014-08-13
EP2763805B1 true EP2763805B1 (en) 2016-03-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12791078.4A Active EP2763805B1 (en) 2011-10-07 2012-10-05 Forging device for the production of a piston blank, and method for the production of the piston blank by means of said forging device

Country Status (6)

Country Link
US (1) US9782823B2 (en)
EP (1) EP2763805B1 (en)
JP (1) JP5976118B2 (en)
CN (1) CN104039475B (en)
DE (1) DE102011115048A1 (en)
WO (1) WO2013050020A1 (en)

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US10253722B2 (en) * 2015-05-01 2019-04-09 Ks Kolbenschmidt Us, Inc. Methods for forging a piston blank
US20190022739A1 (en) * 2016-01-22 2019-01-24 Ks Kolbenschmidt Gmbh Piston Having Three Ring Grooves And A Further Groove Having A Joint
CN111512036A (en) 2017-11-14 2020-08-07 Ks科尔本施密特有限公司 Optimally designed steel piston
DE102018207874B4 (en) * 2018-05-18 2023-10-26 Federal-Mogul Nürnberg GmbH Method for multidirectional forging of a piston
CN112222342B (en) * 2020-09-11 2022-07-01 郑州机械研究所有限公司 Hot extrusion forming device and process for steel diesel engine piston

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Also Published As

Publication number Publication date
JP5976118B2 (en) 2016-08-23
JP2014528357A (en) 2014-10-27
CN104039475A (en) 2014-09-10
CN104039475B (en) 2016-03-30
WO2013050020A1 (en) 2013-04-11
US20150020566A1 (en) 2015-01-22
EP2763805A1 (en) 2014-08-13
US9782823B2 (en) 2017-10-10
DE102011115048A1 (en) 2013-04-11

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