EP2431112B1 - Diecast piston - Google Patents

Diecast piston Download PDF

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Publication number
EP2431112B1
EP2431112B1 EP11174686.3A EP11174686A EP2431112B1 EP 2431112 B1 EP2431112 B1 EP 2431112B1 EP 11174686 A EP11174686 A EP 11174686A EP 2431112 B1 EP2431112 B1 EP 2431112B1
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EP
European Patent Office
Prior art keywords
piston head
carrier
fixing part
piston
die
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EP11174686.3A
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German (de)
French (fr)
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EP2431112A1 (en
Inventor
Werner Bochmann
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Schmelzmetall AG
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Schmelzmetall AG
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Publication of EP2431112A1 publication Critical patent/EP2431112A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/203—Injection pistons

Definitions

  • the present invention relates to a device for mounting a piston head on a piston head carrier of a die casting machine, comprising piston head, coaxial fastening part and piston head carrier.
  • Pistons for die casting usually consist of a piston head and a piston head carrier, the latter being attached to an up to 3 m long driven piston rod. Piston rod and piston head slide guided by the wall in a filling chamber.
  • the pistons used in the die casting press the amount of molten metal entering the filling chamber for each shot via the gating system into the cavity of the die where the die casting is formed.
  • the piston heads come with their front side with the molten metals or alloys in contact. Since the heat balance of a piston head is relevant to the casting quality and thus the cost-effectiveness of the process, special attention must be paid to the material of the piston head and its thermal conductivity. Usually, the inner surfaces of the piston heads are cooled by coolant which is guided in or out of the piston carrier towards and away from the piston head. Due to the temporary contact with the molten metal or the molten alloy and the associated temperature changes and temperature levels, the maintenance of the mechanical stability of the piston heads is also essential.
  • Piston heads are usually made of steel or Cu or a hard Cu alloy and are one or more parts, wherein the individual parts of a piston head can be made of different materials.
  • one or more wear rings are provided on the piston head, which are relatively easily replaceable after wear, to prevent expensive complete new procurement of the piston head. Due to the mechanical and thermal stress of the Piston heads and the requirement of (partial) replacement is their attachment to the piston head carrier of particular importance for the handling of Druckgußkolbens in everyday operations.
  • a one-piece piston head is known, on the front-side lateral surface of which a wear ring is seated and which is thermally screwed or shrunk onto a piston carrier with an external thread by means of an internal thread on the area remote from the end face.
  • two ring seals are provided which seal the threaded portion against the end remote from the end of the piston head.
  • a multi-part piston head with wear ring is from the DE 203 09 181 A1 known.
  • a first, axially rearward piston part is fastened to the carrier by means of a bayonet connection
  • a second, axially forward piston part is fastened to the first piston part by means of axial fastening screws and a wear ring is provided in the region of the butt joint of the two parts.
  • a bayonet lock is also from the EP 0 525 229 A1 known, wherein the bayonet-mounted piston head is additionally secured by a screw against radial movement
  • a disadvantage of this prior art is the sometimes difficult removal of the piston heads of the wearers after prolonged operation and their insufficient strength attachment.
  • the invention proposes the combination of features described in claim 1, according to which: the piston head is not formed fastened directly on the piston head carrier by means of a, two components associated connecting device, but the piston head and the coaxial attachment part complementary threads, both metric thread in particular, for finely modifying a common effective axial length (L) of the piston head and coaxial attachment part have, so that the piston head and fastening part by means of the thread between a portion of the piston head carrier are clamping wherein the piston head and fastening part are a clamping force attaching them in at least one stop of the piston head carrier introducing, wherein the fastening part a floating on a piston head carrier mounted thread ing with external thread and the piston head has a corresponding internal thread.
  • the invention proposes not to attach the piston head directly on the piston head carrier by means of a, two components associated, connecting device. Rather, the attachment is done indirectly by a fine-step change in the common effective length of two components of the piston head, which clamp more or less a portion of a piston head carrier between them.
  • the piston head carrier can be structurally simplest designed, he only need to have a simple to be realized stop for clamping force introduction and thus for clamping of the piston head. This stop could for example be a radial projection.
  • the invention proposes that the device has mutually complementary threads on the piston head and mounting part. A thread is a structurally particularly simple solution to the required finely tuned variability of the two piston head parts.
  • a thread can work both positively and positively with advantage and by designing its geometry also be particularly self-locking, for example, preferably in the form of a metric thread but also in the form of a trapezoidal thread.
  • the fastening part is a threaded ring mounted on a piston head carrier with external thread and the piston head a corresponding Having internal thread, both being designed in particular as a metric thread, so that_ the construction is simplified again.
  • the threads of both components engage each other and tighten the threaded ring when actuated fine stepped on the piston head, so that shortens the overall length.
  • the piston head rests on a front-side contact surface of the piston head carrier before the threaded ring is moved into its clamping position.
  • the threaded ring according to the invention is simply pushed over a piston head carrier, wherein its adjustment can be chosen arbitrarily large in the axial rearward direction.
  • the threaded ring slides on the support body floating and axially forward maximum up to a stop.
  • the tolerances of threaded ring and piston head carrier to each other can be chosen so small that an axial displacement along the longitudinal axis of the piston head carrier by hand is rather excluded.
  • this design also means that a not fully tightened by the operator thread despite missing clamping does not lead to a detachment of the piston head from the carrier.
  • Such an axially movable, loose piston head is in the pressure movement on the front-side pressure surface of the piston head carrier, the pressure and holding pressures are provided without clearance
  • the backward movement of Druckgußkolbens may lead to an axial distance from the frontal pressure surface of the piston head carrier and the inner end face of the piston head
  • this axial movement is limited by the stop on the piston head carrier to which the threaded ring comes to rest. This ensures in a simple manner that even a faulty mounting always allows a safe working position of the die-cast piston and the Druckgußkolbenkopf invention can not solve the piston head carrier.
  • the adjustability is particularly simplified according to the invention, when the fastening part is formed polygonal on its radially outer surface. As a result, for example, ring or open-end wrench attack on the threaded ring and tighten or loosen this with a defined torque.
  • the fastening part is tempered, in particular tempered on its side facing the stop is.
  • the preferably made of steel or a Cu alloy fastening part is then particularly durable. The required clamping force does not result in a tempered surface that the material of the fastening part is irreversibly compressed or sheared with repeated clamping.
  • the piston head is designed in several parts, it can be adapted with particular advantage to the respective relevant prevailing ambient conditions, for example by different components consisting of different materials.
  • the piston head consists of a Cu alloy.
  • Such Cu alloys are highly heat conductive and can be formed resistant to wear.
  • the piston head has one or more also releasably attached thereto wear rings, in particular also by laser deposition welding cohesively connected to the piston head body wear rings.
  • the die-cast piston according to the invention is particularly durable and at the same time equipped with high thermal conductivity.
  • This also includes the measure, according to which the outer surface of the piston head is made wear-resistant by galvanic material application. Additional wear rings can then be omitted with advantage, but they can also be present, possibly less material dimensioned to save material.
  • FIG. 1 shows a portion of a Druckgußkolbens, namely a 120 ° angled longitudinal section through a piston head 1 and a piston head carrier.
  • the latter is mounted on a piston rod, not shown, which engages in the coaxial opening of the piston head carrier 3.
  • the piston head carrier 3 has in its interior a coaxial channel 11 for guiding a cooling medium. This occurs in the region of the end face 12 of the piston head carrier 3 and acts on the inner end face 13 of the piston head 1. From there it flows radially outward in four channels of the end face of the piston head carrier 3 and then along the inner circumferential surface of the piston head 1 axially backwards until it again enters the piston head carrier 3 and is discharged there. This is done via axially / radially inclined through holes from the Kolbenitatiaussen- in the inside. In the sectional plane are also two radial guide rings 14 for a run between them O-ring 2.
  • a stop 6 is formed on the piston head carrier 3 as a radially encircling web with a stop shoulder 15.
  • the one-piece piston head 1 made of a Cu alloy has in its axially front region on an end face, which is radially retracted.
  • a wear ring may be provided, for example, applied cohesively by means of laser deposition welding or positively fitted in an annular groove or thermally shrunk or otherwise secured.
  • the piston head 1 In its axially rearward region, the piston head 1 has an internal thread 9. This engages over a complementary external thread 8 of the coaxial fastening part 4, wherein both threads are formed as a metric thread.
  • the thread is also an embodiment of the thread as radially and axially interrupted thread, including trapezoidal thread, so that the threaded ring 4 is initially herschiebbar almost to the stop 6, with the threaded sections prevail. Only for clamping by means of a radial screwing the threads engage each other and thus allow the application of a clamping force.
  • the threaded ring 4 is floatingly supported on the outer surface of the piston carrier 3. Its axial path is bounded to the front by the stop 6, to the rear by the outer shape of the piston carrier, not shown.
  • the threaded ring 4 is simply pushed from behind onto the piston carrier 3 prior to assembly of the piston head 1 according to the invention. He has on its radially outer surface 10 a Polygon structure, which can be grasped by a spanner and over which the force for firm screwing with the piston head 1 is introduced.
  • the latter is pushed from the front onto the piston head carrier 3 and axially rearwardly brought into engagement with the threaded ring 4.
  • the threaded ring 4 is screwed into the internal thread 9, so that the effective total length L of the piston head is reduced, which is therefore formed from the additive effective total length of piston head 1 and threaded ring 4.
  • Due to the fine-step screwing the tempered side 16 of the threaded ring 4 is pulled against the stop shoulder 15 of the stopper 6 by clamping.
  • the stop shoulder 15 can also be designed differently than at right angles to the lateral surface of the piston carrier 3 angled, it could also be formed in a different cross-sectional shape than that of a web.
  • the design is particularly simple in construction as a cross-sectionally rectangular web.
  • the threaded ring 4 is chosen in its thickness in this embodiment so that it is aligned with the defined by the guide ring height shell level of the piston head carrier 3. According to the invention, its thickness can also be slightly lower, so that a radially inwardly directed train is exerted on the piston head 1, which fixes it even more strongly on the piston head carrier 3.

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

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zur Befestigung eines Kolbenkopfes auf einem Kolbenkopfträger einer Druckgießmaschine, umfassend Kolbenkopf, koaxiales Befestigungsteil und Kolbenkopfträger.The present invention relates to a device for mounting a piston head on a piston head carrier of a die casting machine, comprising piston head, coaxial fastening part and piston head carrier.

Kolben für den Druckguss bestehen in der Regel aus einem Kolbenkopf und einem Kolbenkopfträger, wobei letzterer an einer bis zu 3 m langen angetriebenen Kolbenstange befestigt ist. Kolbenstange und Kolbenkopf gleiten wandungsgeführt in einer Füllkammer.Pistons for die casting usually consist of a piston head and a piston head carrier, the latter being attached to an up to 3 m long driven piston rod. Piston rod and piston head slide guided by the wall in a filling chamber.

Die im Druckguss eingesetzten Kolben pressen die für jeden Schuss in die Füllkammer eintretende Menge an schmelzflüssigem Metall über das Anschnittsystem in die Kavität der Druckgußform, wo das Druckgußteil entsteht. Die Kolbenköpfe kommen dabei mit ihrer Stirnseite mit den schmelzflüssigen Metallen bzw. Legierungen in Kontakt. Da der Wärmehaushalt eines Kolbenkopfes relevant für die Gussqualität und damit die Wirtschaftlichkeit des Verfahrens ist, ist ein besonderer Augenmerk auf das Material des Kolbenkopfes und dessen Wärmeleitfähigkeit zu legen. Üblicherweise sind die inneren Oberflächen der Kolbenköpfe durch Kühlmittel gekühlt, welches in öder an dem Kolbenträger zum Kolbenkopf hin und von ihm weg geführt ist. Aufgrund des zeitweisen Kontaktes mit dem schmelzflüssigen Metall oder der schmelzflüssigen Legierung und den damit verbundenen Temperaturwechseln und Temperaturhöhen ist die Aufrechterhaltung der mechanischen Stabilität der Kolbenköpfe ebenfalls wesentlich.The pistons used in the die casting press the amount of molten metal entering the filling chamber for each shot via the gating system into the cavity of the die where the die casting is formed. The piston heads come with their front side with the molten metals or alloys in contact. Since the heat balance of a piston head is relevant to the casting quality and thus the cost-effectiveness of the process, special attention must be paid to the material of the piston head and its thermal conductivity. Usually, the inner surfaces of the piston heads are cooled by coolant which is guided in or out of the piston carrier towards and away from the piston head. Due to the temporary contact with the molten metal or the molten alloy and the associated temperature changes and temperature levels, the maintenance of the mechanical stability of the piston heads is also essential.

Diese unterliegen darüber hinaus auch einem mechanischen Abrieb an der Wand der Füllkammer. Kolbenköpfe bestehen in der Regel aus Stahl oder aus Cu oder einer harten Cu-Legierung und sind dabei ein- oder mehrteilig ausgebildet, wobei die einzelnen Teile eines Kolbenkopfes aus unterschiedlichen Materialien gefertigt sein können. In vielen bekannten Ausführungen sind ein oder mehrere Verschleißringe am Kolbenkopf vorgesehen, die nach Verschleiß relativ einfach austauschbar sind, um eine teure vollständige Neubeschaffung des Kolbenkopfes zu verhindern. Aufgrund der mechanischen und thermischen Belastung der Kolbenköpfe und dem Erfordernis des (Teil-)Austausches ist deren Befestigung am Kolbenkopfträger von besonderer Bedeutung für die Handhabbarkeit des Druckgußkolbens im betrieblichen Alltag.These are also subject to mechanical abrasion on the wall of the filling chamber. Piston heads are usually made of steel or Cu or a hard Cu alloy and are one or more parts, wherein the individual parts of a piston head can be made of different materials. In many known embodiments, one or more wear rings are provided on the piston head, which are relatively easily replaceable after wear, to prevent expensive complete new procurement of the piston head. Due to the mechanical and thermal stress of the Piston heads and the requirement of (partial) replacement is their attachment to the piston head carrier of particular importance for the handling of Druckgußkolbens in everyday operations.

Aus der EP 0 423 413 A2 ist ein einteiliger Kolbenkopf bekannt, auf dessen stirnseitiger Mantelfläche ein Verschleißring sitzt und der mittels eines Innengewindes am stirnseitig entfernteren Bereich auf einen Kolbenträger mit Außengewinde thermisch aufgeschraubt bzw. aufgeschrumpft wird. Zusätzlich sind zwei Ringdichtungen vorgesehen, die den Gewindeabschnitt gegen das stirnseitig entfernte Ende des Kolbenkopfes dichten.From the EP 0 423 413 A2 a one-piece piston head is known, on the front-side lateral surface of which a wear ring is seated and which is thermally screwed or shrunk onto a piston carrier with an external thread by means of an internal thread on the area remote from the end face. In addition, two ring seals are provided which seal the threaded portion against the end remote from the end of the piston head.

Eine weitere Gewindeverbindung eines Kolbenkopfes mit einem Kolbenträger ist aus der DE 20 2008 002 667 bekannt. Bei diesem ist das Innengewinde des Kopfes trapezförmig ausgebildet, der Kolbenkopf liegt axial an einer Anschlagschulter des Trägers an.Another threaded connection of a piston head with a piston carrier is from the DE 20 2008 002 667 known. In this, the internal thread of the head is trapezoidal, the piston head abuts axially against a stop shoulder of the wearer.

Ein mehrteiliger Kolbenkopf mit Verschleißring ist aus der DE 203 09 181 A1 bekannt. Bei diesem bekannten Kolbenkopf wird ein erstes, axial rückwärtigeres Kolbenteil mittels einer Bajonettverbindung am Träger befestigt, ein zweites, axial vorderes Kolbenteil mittels axialer Befestigungsschrauben am ersten Kolbenteil befestigt und ein Verschleißring im Bereich der Stoßfuge der beiden Teile vorgesehen. Ein solcher Bajonettverschluß ist auch aus der EP 0 525 229 A1 bekannt, wobei der bajonettartig aufgesteckte Kolbenkopf hier zusätzlich mittels einer Schraube gegen eine Radialbewegung gesichert wirdA multi-part piston head with wear ring is from the DE 203 09 181 A1 known. In this known piston head, a first, axially rearward piston part is fastened to the carrier by means of a bayonet connection, a second, axially forward piston part is fastened to the first piston part by means of axial fastening screws and a wear ring is provided in the region of the butt joint of the two parts. Such a bayonet lock is also from the EP 0 525 229 A1 known, wherein the bayonet-mounted piston head is additionally secured by a screw against radial movement

Aus der DE 299 05 902 U1 ist eine Befestigung eines Kolbenkopfes an einem Kolbenkopfträger bekannt, die mittels einer koaxial im Inneren des Kolbenkopfträgers angeordneten Schraube erfolgt, die in ein Gewinde des Kolbenkopfes eingreift.From the DE 299 05 902 U1 an attachment of a piston head to a piston head carrier is known, which is effected by means of a coaxially arranged in the interior of the piston head carrier screw which engages in a thread of the piston head.

Nachteilig an diesem Stand der Technik ist der teilweise schwierige Abbau der Kolbenköpfe von den Trägern nach längerer Betriebszeit und deren ungenügend starke Befestigung.A disadvantage of this prior art is the sometimes difficult removal of the piston heads of the wearers after prolonged operation and their insufficient strength attachment.

Um die Aufgabe eines einfacheren Abbaus der ausreichend stark befestigten Kolbenköpfe von den Trägern nach längerer Betriebszeit zu lösen, schlägt die Erfindung die in Anspruch 1 beschriebene Merkmalskombination vor, wonach: der Kolbenkopf nicht unmittelbar am Kolbenkopfträger mittels einer, beiden Bauteilen zugeordneter Verbindungsvorrichtung befestigbar ausbildet ist, sondern der Kolbenkopf und das koaxiale Befestigungsteil zueinander komplementäre Gewinde, beide insbesondere metrische Gewinde, zur feinstufigen Veränderung einer gemeinsamen wirksamen axialen Länge (L) von Kolbenkopf und koaxialem Befestigungsteil aufweisen, sodaß Kolbenkopf und Befestigungsteil mittels der Gewinde zwischen sich einen Abschnitt des Kolbenkopfträgers klemmend sind, wobei Kolbenkopf und Befestigungsteil eine sie befestigende Klemmkraft in wenigstens einen Anschlag des Kolbenkopfträgers einbringend sind, wobei das Befestigungsteil ein schwimmend auf einem Kolbenkopfträger gelagerter Gewindering mit Außengewinde ist und der Kolbenkopf ein korrespondierendes Innengewinde aufweist. Mit sehr großem Vorteil schlägt die Erfindung vor, den Kolbenkopf nicht unmittelbar am Kolbenkopfträger mittels einer, beiden Bauteilen zugeordneten, Verbindungsvorrichtung zu befestigen. Vielmehr erfolgt die Befestigung indirekt durch eine feinstufige Veränderung der gemeinsamen wirksamen Länge zweier Bauteile des Kolbenkopfes, die mehr oder weniger zwischen sich einen Abschnitt eines Kolbenkopfträgers klemmen. Dies hat den Vorteil, dass der Kolbenkopfträger konstruktiv einfachst ausgestaltet sein kann, er muss lediglich einen einfach zu realisierenden Anschlag zur Klemmkrafteinleitung und damit zur Klemmung des Kolbenkopfes aufweisen. Dieser Anschlag könnte beispielsweise ein radialer Vorsprung sein. Weiter schlägt die Erfindung vor, dass die Vorrichtung zueinander komplementäre Gewinde an Kolbenkopf und Befestigungsteil aufweist. Ein Gewinde ist eine konstruktiv besonders einfache Lösung der erforderlichen feinstufigen Veränderbarkeit der beiden Kolbenkopfteile. Ein Gewinde kann mit Vorteil sowohl kraft- als auch formschlüssig arbeiten und durch Gestaltung seiner Geometrie auch besonders selbsthemmend sein, beispielsweise bevorzugt in Form eines metrischen Gewindes aber auch in Form eines Trapezgewindes. Schließlich schlägt die Erfindung vor, dass das Befestigungsteil ein schwimmend auf einem Kolbenkopfträger gelagerter Gewindering mit Außengewinde ist und der Kolbenkopf ein korrespondierendes Innengewinde aufweist, wobei beide insbesondere als metrisches Gewinde ausgebildet sind, so daß_die Konstruktion nochmals vereinfacht ist. Die Gewinde beider Bauteile greifen ineinander und ziehen den Gewindering bei Betätigung feinstufig an den Kolbenkopf heran, so dass sich die Gesamtlänge verkürzt.In order to solve the problem of easier removal of the sufficiently strong fastened piston heads from the carriers after prolonged operation, the invention proposes the combination of features described in claim 1, according to which: the piston head is not formed fastened directly on the piston head carrier by means of a, two components associated connecting device, but the piston head and the coaxial attachment part complementary threads, both metric thread in particular, for finely modifying a common effective axial length (L) of the piston head and coaxial attachment part have, so that the piston head and fastening part by means of the thread between a portion of the piston head carrier are clamping wherein the piston head and fastening part are a clamping force attaching them in at least one stop of the piston head carrier introducing, wherein the fastening part a floating on a piston head carrier mounted thread ing with external thread and the piston head has a corresponding internal thread. With great advantage, the invention proposes not to attach the piston head directly on the piston head carrier by means of a, two components associated, connecting device. Rather, the attachment is done indirectly by a fine-step change in the common effective length of two components of the piston head, which clamp more or less a portion of a piston head carrier between them. This has the advantage that the piston head carrier can be structurally simplest designed, he only need to have a simple to be realized stop for clamping force introduction and thus for clamping of the piston head. This stop could for example be a radial projection. Next, the invention proposes that the device has mutually complementary threads on the piston head and mounting part. A thread is a structurally particularly simple solution to the required finely tuned variability of the two piston head parts. A thread can work both positively and positively with advantage and by designing its geometry also be particularly self-locking, for example, preferably in the form of a metric thread but also in the form of a trapezoidal thread. Finally, the invention proposes that the fastening part is a threaded ring mounted on a piston head carrier with external thread and the piston head a corresponding Having internal thread, both being designed in particular as a metric thread, so that_ the construction is simplified again. The threads of both components engage each other and tighten the threaded ring when actuated fine stepped on the piston head, so that shortens the overall length.

Es ist dabei vorteilhaft, wenn der Kolbenkopf auf einer stirnseitigen Andruckfläche des Kolbenkopfträgers aufliegt, bevor der Gewindering in seine Klemmposition bewegt ist. Der Gewindering wird erfindungsgemäß einfach über einen Kolbenkopfträger geschoben, wobei sein Verstellweg in axial rückwärtiger Richtung beliebig groß gewählt sein kann. Der Gewindering gleitet auf dem Trägerkörper schwimmend und axial vorwärts maximal bis zu einem Anschlag. Hierbei können die Toleranzen von Gewindering und Kolbenkopfträger zueinander auch so gering gewählt werden, dass eine axiale Verschiebbarkeit entlang der Längsachse des Kolbenkopfträgers von Hand eher ausgeschlossen ist. Mit großem Vorteil führt diese Ausgestaltung auch dazu, dass ein vom Bediener nicht vollständig angezogenes Gewinde trotz fehlender Klemmung nicht zu einer Loslösung des Kolbenkopfes vom Träger führt. Ein solch axial beweglicher, loser Kolbenkopf liegt bei der Druckbewegung an der stirnseitigen Andruckfläche des Kolbenkopfträgers auf, die Anpress- und Haltedrücke werden ohne Spiel erbracht Die Rückwärtsbewegung des Druckgußkolbens kann zwar zu einer axialen Entfernung von stirnseitiger Andruckfläche des Kolbenkopfträgers und der inneren Stirnseite des Kolbenkopfes führen, diese axiale Bewegung ist jedoch durch den Anschlag am Kolbenkopfträger begrenzt, an dem der Gewindering zu liegen kommt. So ist auf einfache Weise sichergestellt, dass selbst eine Fehlmontage stets eine sichere Arbeitsposition des Druckgußkolbens ermöglicht und sich der erfindungsgemäße Druckgußkolbenkopf nicht vom Kolbenkopfträger lösen kann.It is advantageous if the piston head rests on a front-side contact surface of the piston head carrier before the threaded ring is moved into its clamping position. The threaded ring according to the invention is simply pushed over a piston head carrier, wherein its adjustment can be chosen arbitrarily large in the axial rearward direction. The threaded ring slides on the support body floating and axially forward maximum up to a stop. Here, the tolerances of threaded ring and piston head carrier to each other can be chosen so small that an axial displacement along the longitudinal axis of the piston head carrier by hand is rather excluded. With great advantage, this design also means that a not fully tightened by the operator thread despite missing clamping does not lead to a detachment of the piston head from the carrier. Such an axially movable, loose piston head is in the pressure movement on the front-side pressure surface of the piston head carrier, the pressure and holding pressures are provided without clearance The backward movement of Druckgußkolbens may lead to an axial distance from the frontal pressure surface of the piston head carrier and the inner end face of the piston head However, this axial movement is limited by the stop on the piston head carrier to which the threaded ring comes to rest. This ensures in a simple manner that even a faulty mounting always allows a safe working position of the die-cast piston and the Druckgußkolbenkopf invention can not solve the piston head carrier.

Die Verstellbarkeit wird erfindungsgemäß besonders vereinfacht, wenn das Befestigungsteil auf seiner radial äußeren Oberfläche polygonal ausgebildet ist. Hierdurch können beispielsweise Ring- oder Maulschlüssel am Gewindering angreifen und diesen mit definiertem Drehmoment anziehen oder lösen.The adjustability is particularly simplified according to the invention, when the fastening part is formed polygonal on its radially outer surface. As a result, for example, ring or open-end wrench attack on the threaded ring and tighten or loosen this with a defined torque.

In Ausgestaltung der Erfindung ist vorgesehen, dass das Befestigungsteil vergütet, insbesondere auf seiner dem Anschlag zugewandten Seite vergütet ausgebildet ist. Das vorzugsweise aus Stahl oder einer Cu-Legierung bestehende Befestigungsteil ist dann besonders dauerhaft verwendbar. Die erforderliche Klemmkraft führt bei einer vergüteten Oberfläche nicht dazu, dass das Material des Befestigungsteils bei mehrmaliger Klemmung irreversibel gestaucht oder abgeschert wird.In an embodiment of the invention, it is provided that the fastening part is tempered, in particular tempered on its side facing the stop is. The preferably made of steel or a Cu alloy fastening part is then particularly durable. The required clamping force does not result in a tempered surface that the material of the fastening part is irreversibly compressed or sheared with repeated clamping.

Ist der Kolbenkopf mehrteilig ausgebildet, kann er mit besonderem Vorteil auf die jeweils relevanten herrschenden Umgebungsbedingungen angepasst werden, beispielsweise indem unterschiedliche Bauteile aus unterschiedlichen Materialien bestehen.If the piston head is designed in several parts, it can be adapted with particular advantage to the respective relevant prevailing ambient conditions, for example by different components consisting of different materials.

In Ausgestaltung der Erfindung ist vorgesehen, dass der Kolbenkopf aus einer Cu-Legierung besteht. Derartige Cu-Legierungen sind hochwärmeleitfähig und können verschleißresistent gebildet sein. Diesbezüglich wird auf die Cu-Legierungen der Anmelderin verwiesen.In an embodiment of the invention, it is provided that the piston head consists of a Cu alloy. Such Cu alloys are highly heat conductive and can be formed resistant to wear. In this regard, reference is made to the applicant's Cu alloys.

Vorteilhaft ist auch die Weiterbildung der Erfindung, wonach der Kolbenkopf einen oder mehrere auch lösbar an ihm befestigte Verschleißringe aufweist, insbesondere auch durch Laserauftragsschweißen stoffschlüssig mit dem Kolbenkopfkörper verbundene Verschleißringe aufweist. Hierdurch ist der erfindungsgemäße Druckgusskolben besonders haltbar und gleichzeitig mit hoher Wärmeleitfähigkeit ausgestattet. Hierzu gehört auch die Maßnahme, wonach die äußere Mantelfläche des Kolbenkopfes durch galvanischen Materialauftrag verschleißresistent ausgestaltet wird. Zusätzliche Verschleißringe können dann mit Vorteil entfallen, sie können jedoch auch vorhanden sein, eventuell materialsparend geringer dimensioniert.Also advantageous is the development of the invention, according to which the piston head has one or more also releasably attached thereto wear rings, in particular also by laser deposition welding cohesively connected to the piston head body wear rings. As a result, the die-cast piston according to the invention is particularly durable and at the same time equipped with high thermal conductivity. This also includes the measure, according to which the outer surface of the piston head is made wear-resistant by galvanic material application. Additional wear rings can then be omitted with advantage, but they can also be present, possibly less material dimensioned to save material.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der einzigen Figur der Zeichnung näher erläutert. Hierbei zeigt:

Fig. 1:
einen skizzenhaften Querschnitt durch eine erfindungsgemäße Ausführungsform
An embodiment of the invention will be explained below with reference to the single figure of the drawing. Hereby shows:
Fig. 1:
a sketchy cross section through an embodiment of the invention

Figur 1 zeigt einen Teilbereich eines Druckgußkolbens, nämlich einen um 120° gewinkelten Längsschnitt durch einen Kolbenkopf 1 und einen Kolbenkopfträger 3. FIG. 1 shows a portion of a Druckgußkolbens, namely a 120 ° angled longitudinal section through a piston head 1 and a piston head carrier. 3

Letzterer ist auf einer nicht dargestellten Kolbenstange befestigt, die in die koaxiale Öffnung des Kolbenkopfträgers 3 eingreift. Der Kolbenkopfträger 3 weist in seinem Inneren einen koaxialen Kanal 11 zur Führung eines Kühlmediums auf. Dieses tritt im Bereich der Stirnfläche 12 des Kolbenkopfträgers 3 aus und beaufschlagt die innere Stirnfläche 13 des Kolbenkopfes 1. Von dort strömt es radial in vier Kanälen der Stirnseite des Kolbenkopfträgers 3 auswärts und anschließend entlang der inneren Mantelfläche des Kolbenkopfes 1 axial rückwärts, bis es wiederum in den Kolbenkopfträger 3 eintritt und dort abgeführt wird. Dies erfolgt über axial/radial geneigte Durchgangsbohrungen von der Kolbenträgeraussen- in dessen Innenseite. In der Schnittebene sind auch zwei radiale Führungsringe 14 für einen zwischen diesen geführten O-Ring 2. Ein Anschlag 6 ist am Kolbenkopfträger 3 als radial umlaufender Steg mit einer Anschlagschulter 15 ausgebildet.The latter is mounted on a piston rod, not shown, which engages in the coaxial opening of the piston head carrier 3. The piston head carrier 3 has in its interior a coaxial channel 11 for guiding a cooling medium. This occurs in the region of the end face 12 of the piston head carrier 3 and acts on the inner end face 13 of the piston head 1. From there it flows radially outward in four channels of the end face of the piston head carrier 3 and then along the inner circumferential surface of the piston head 1 axially backwards until it again enters the piston head carrier 3 and is discharged there. This is done via axially / radially inclined through holes from the Kolbenträgeraussen- in the inside. In the sectional plane are also two radial guide rings 14 for a run between them O-ring 2. A stop 6 is formed on the piston head carrier 3 as a radially encircling web with a stop shoulder 15.

Der einteilige Kolbenkopf 1 aus einer Cu-Legierung weist in seinem axial vorderen Bereich eine Stirnfläche auf, die radial eingezogen ist. Im Übergangsbereich von Stirn- zu Mantelfläche kann ein Verschleißring vorgesehen sein, beispielsweise stoffschlüssig aufgetragen mittels Laserauftragsschweißens oder formschlüssig in eine Ringnut eingepaßt oder thermisch aufgeschrumpft oder anderweitig befestigt. Im seinem axial rückwärtigen Bereich weißt der Kolbenkopf 1 ein Innengewinde 9 auf. Dieses übergreift ein komplementäres Außengewinde 8 des koaxialen Befestigungsteils 4, wobei beide Gewinde als metrische Gewinde ausgebildet sind. Erfindungsgemäß denkbar ist auch eine Ausgestaltung der Gewinde als radial und axial unterbrochene Gewinde, auch Trapezgewinde, so daß der Gewindering 4 zunächst bis fast an den Anschlag 6 heranschiebbar ist, wobei sich die Gewindeabschnitte durchsetzen. Erst zur Klemmung mittels einer radialen Schraubbewegung greifen die Gewindegänge ineinander und ermöglichen so die Aufbringung einer Klemmkraft. Der Gewindering 4 ist schwimmend auf der Außenfläche des Kolbenträgers 3 gelagert. Sein axialer Weg ist nach vorne durch den Anschlag 6 begrenzt, nach hinten durch die äußere Form des nicht dargestellten Kolbenträgers. Der Gewindering 4 wird vor der Montage des erfindungsgemäßen Kolbenkopfes 1 einfach von hinten auf den Kolbenträger 3 aufgeschoben. Er weist auf seiner radial äußeren Oberfläche 10 eine Polygonstruktur auf, die durch einen Maulschlüssel greifbar ist und über die die Kraft zur festen Verschraubung mit dem Kolbenkopf 1 eingeleitet wird.The one-piece piston head 1 made of a Cu alloy has in its axially front region on an end face, which is radially retracted. In the transition region from face to shell surface, a wear ring may be provided, for example, applied cohesively by means of laser deposition welding or positively fitted in an annular groove or thermally shrunk or otherwise secured. In its axially rearward region, the piston head 1 has an internal thread 9. This engages over a complementary external thread 8 of the coaxial fastening part 4, wherein both threads are formed as a metric thread. According to the invention is also an embodiment of the thread as radially and axially interrupted thread, including trapezoidal thread, so that the threaded ring 4 is initially herschiebbar almost to the stop 6, with the threaded sections prevail. Only for clamping by means of a radial screwing the threads engage each other and thus allow the application of a clamping force. The threaded ring 4 is floatingly supported on the outer surface of the piston carrier 3. Its axial path is bounded to the front by the stop 6, to the rear by the outer shape of the piston carrier, not shown. The threaded ring 4 is simply pushed from behind onto the piston carrier 3 prior to assembly of the piston head 1 according to the invention. He has on its radially outer surface 10 a Polygon structure, which can be grasped by a spanner and over which the force for firm screwing with the piston head 1 is introduced.

Zur klemmenden Befestigung des erfindungsgemäßen Kolbenkopfes 1 wird letzterer von vorne auf den Kolbenkopfträger 3 geschoben und axial rückwärtig mit dem Gewindering 4 in Eingriff gebracht. Mittels eines Maulschlüssels wird dann der Gewindering 4 in das Innengewinde 9 geschraubt, so daß sich die wirksame Gesamtlänge L des Kolbenkopfes verringert, die demnach aus der additiven wirksamen Gesamtlänge von Kolbenkopf 1 und Gewindering 4 gebildet ist. Durch die feinstufige Schraubbewegung wird die vergütete Seite 16 des Gewinderings 4 gegen die Anschlagschulter 15 des Anschlags 6 klemmend gezogen. Die Anschlagschulter 15 kann dabei auch anders als rechtwinklig zur Mantelfläche des Kolbenträgers 3 gewinkelt ausgebildet sein, sie könnte ebenfalls in einer anderen Querschnittsform als der eines Steges ausgebildet sein. Hier wären auch schwalbenschwanzartige Formen denkbar. Konstruktiv besonders einfach ist die Ausbildung als im Querschnitt rechteckiger Steg. Der Gewindering 4 ist dabei in seiner Dicke bei diesem Ausführungsbeispiel so gewählt, daß diese mit der durch die Führungsringhöhe definierten Mantelebene des Kolbenkopfträgers 3 fluchtet. Erfindungsgemäß kann dessen Dicke auch etwas geringer sein, so daß ein radial einwärts gerichteter Zug auf den Kolbenkopf 1 ausgeübt wird, der diesen noch stärker am Kolbenkopfträger 3 befestigt.For clamping attachment of the piston head 1 according to the invention, the latter is pushed from the front onto the piston head carrier 3 and axially rearwardly brought into engagement with the threaded ring 4. By means of an open-end wrench then the threaded ring 4 is screwed into the internal thread 9, so that the effective total length L of the piston head is reduced, which is therefore formed from the additive effective total length of piston head 1 and threaded ring 4. Due to the fine-step screwing the tempered side 16 of the threaded ring 4 is pulled against the stop shoulder 15 of the stopper 6 by clamping. The stop shoulder 15 can also be designed differently than at right angles to the lateral surface of the piston carrier 3 angled, it could also be formed in a different cross-sectional shape than that of a web. Dovetail-like shapes would also be conceivable here. The design is particularly simple in construction as a cross-sectionally rectangular web. The threaded ring 4 is chosen in its thickness in this embodiment so that it is aligned with the defined by the guide ring height shell level of the piston head carrier 3. According to the invention, its thickness can also be slightly lower, so that a radially inwardly directed train is exerted on the piston head 1, which fixes it even more strongly on the piston head carrier 3.

BEZUGSZEICHENLISTELIST OF REFERENCE NUMBERS

1.1.
Kolbenkopfpiston head
2.Second
O-RingO-ring
3.Third
KolbenkopfträgerPiston head carrier
4.4th
Befestigungsteilattachment portion
5.5th
Vorrichtungcontraption
6.6th
Anschlagattack
7.7th
Gewinderingthreaded ring
8.8th.
Außengewindeexternal thread
9.9th
Innengewindeinner thread
10.10th
radial äußere Oberflächeradially outer surface
11.11th
koaxialer Kanalcoaxial channel
12.12th
Stirnflächeface
13.13th
innere Stirnflächeinner face
14.14th
radialer Führungsringradial guide ring
15.15th
Anschlagschulterstop shoulder
16.16th
Gehärtete SeiteHardened side

Claims (6)

  1. A device for fixing a piston head (1) on a piston head carrier (3) of a die-casting machine comprising a piston head (1), a coaxial fixing part (4) and a piston head carrier (3), wherein the piston head (1) is constituted capable of being fixed not directly on the piston head carrier (3) by means of a connecting device assigned to the two components, but rather the piston head (1) and the coaxial fixing part (4) comprise mutually complementary threads (5), both in particular metric threads, for the finely graduated adjustment of a common effective axial length (L) of the piston head (1) and the coaxial fixing part (4), so that the piston head (1) and the fixing part (4) clamp between them a portion of the piston head carrier (3) by means of the thread (5), wherein the piston head (1) and the fixing part (4) introduce a clamping force that fixes them into at least one stop (6) of the piston head carrier (3), characterised in that the fixing part (4) is a threaded ring (7) with an external thread (8) mounted in a floating manner on the piston head carrier (3) and the piston head (1) comprises a corresponding internal thread (9).
  2. A die-cast piston head (1) according to claim 1, characterised in that the fixing part (4) is constituted as a polygon on its radially outer surface (10).
  3. The die-cast piston head (1) according to any one of the preceding claims, characterised in that the fixing part (4) is hardened and tempered, in particular is constituted hardened and tempered on its side facing a stop (6).
  4. The die-cast piston head (1) according to any one of the preceding claims, characterised in that the piston head (1) is constituted in a multipart manner.
  5. The die-cast piston head (1) according to any one of the preceding claims, characterised in that the piston head (1) is made of a Cu alloy.
  6. The die-cast piston head (1) according to any one of the preceding claims, characterised in that it comprises one or more sealing rings also fixed detachably to it, in particular also comprises sealing rings connected by laser deposition welding in a firmly bonded manner to the piston head body and/or that its outer lateral surface is constituted wear-resistant by means of a galvanic material deposit.
EP11174686.3A 2010-09-21 2011-07-20 Diecast piston Not-in-force EP2431112B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201020008596 DE202010008596U1 (en) 2010-09-21 2010-09-21 Die-cast pistons

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EP2431112A1 EP2431112A1 (en) 2012-03-21
EP2431112B1 true EP2431112B1 (en) 2016-05-11

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SI24339A (en) * 2013-04-24 2014-10-30 Hts Ic D.O.O. Piston with optimum cooling effectiveness for cold-chamber die-casting systems
US10166601B2 (en) 2015-11-17 2019-01-01 United Technologies Corporation Die cast tip cover and method of managing radial deflection of die cast tip
US10173261B2 (en) * 2015-11-17 2019-01-08 United Technologies Corporation Highly cooled die casting plunger

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29905902U1 (en) * 1999-03-31 1999-07-01 Munderkinger Industrievertretungs- und Handelsgesellschaft m.b.H., 89597 Munderkingen Ram

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3670805A (en) * 1971-03-30 1972-06-20 Merle E Weiers Die casting plungers
JPS56136269A (en) * 1980-03-28 1981-10-24 Akio Nakano Pressure device for molten metal
JPS6487052A (en) * 1987-09-30 1989-03-31 Hitachi Metals Ltd Plunger for die casting
ES2102354T3 (en) 1989-10-18 1997-08-01 Allper Ag PISTON, FOR A LOW PRESSURE CASTING DEVICE.
EP0525229B1 (en) 1991-07-29 1996-11-06 Allper Ag Piston, especially for pushing out liquid metal from a pouring cylinder
DE20309181U1 (en) 2003-06-13 2004-10-28 Allper Ag Multi-part piston for a cold chamber die casting machine
DE202008002667U1 (en) 2008-02-26 2008-04-24 Schmelzmetall Ag Die-cast piston head and adapter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29905902U1 (en) * 1999-03-31 1999-07-01 Munderkinger Industrievertretungs- und Handelsgesellschaft m.b.H., 89597 Munderkingen Ram

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EP2431112A1 (en) 2012-03-21
DE202010008596U1 (en) 2010-12-02

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