EP0901852A1 - Plunger for a hot-chamber die-casting machine - Google Patents

Plunger for a hot-chamber die-casting machine Download PDF

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Publication number
EP0901852A1
EP0901852A1 EP97810643A EP97810643A EP0901852A1 EP 0901852 A1 EP0901852 A1 EP 0901852A1 EP 97810643 A EP97810643 A EP 97810643A EP 97810643 A EP97810643 A EP 97810643A EP 0901852 A1 EP0901852 A1 EP 0901852A1
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EP
European Patent Office
Prior art keywords
piston
sealing ring
slot
casting cylinder
web
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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.)
Granted
Application number
EP97810643A
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German (de)
French (fr)
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EP0901852B1 (en
Inventor
André Müller
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Individual
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Individual
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Filing date
Publication date
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Priority to DE59707737T priority Critical patent/DE59707737D1/en
Priority to ES97810643T priority patent/ES2178746T3/en
Priority to EP19970810643 priority patent/EP0901852B1/en
Publication of EP0901852A1 publication Critical patent/EP0901852A1/en
Application granted granted Critical
Publication of EP0901852B1 publication Critical patent/EP0901852B1/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 piston for a casting cylinder of a hot chamber die casting machine and further relates to a sealing ring for such a piston.
  • At least two ring segments are loosely arranged in the ring groove, which are during the working stroke of the piston through the liquid metal flowing through the channels to the inner jacket of the casting cylinder are pressed and thus act as a sealing ring.
  • liquid metal is also between the piston and The casting cylinder can penetrate towards the piston rod and solidify with
  • the possible destruction of pistons and casting cylinders is also the manufacture of the Pistons extremely complicated and expensive.
  • a sealing ring is in EP-PS 423 413 for the cap of a carrier body for use in a cold chamber die casting press disclosed, but which are not used in a hot chamber die casting machine can.
  • the invention is therefore based on the object of avoiding the disadvantages described and a piston for a casting cylinder of a hot chamber die casting machine create that ensures a secure seal with simple and not expensive construction. It is also an object of the invention to provide a sealing ring for such a piston to create, which is characterized by a good sealing effect and is easy to replace, since in the event of damage when metal solidifies, only the sealing ring is damaged shall be.
  • the object is achieved by a sealing ring with the features specified in claim 1 and a piston with the features specified in claim 4 solved.
  • the sealing function of the sealing ring is always fulfilled even in the relaxed rest position.
  • a sealing ring according to Claim 2 With the formation of the sealing ring according to Claim 2 he constantly exerts a pressing force on the casting cylinder.
  • a sealing ring According to claim 3 is particularly well suited for casting zinc alloys.
  • a piston according to claim 5 gives excellent sealing effect and homogeneous pressure build-up of the casting metal, allows a small overall length of the casting cylinder and piston and easy interchangeability of the sealing ring.
  • the sealing ring is first damaged, so that only this needs to be replaced.
  • the piston 1 made of steel with its piston body 2 (FIG. 1) is also only indicated made of steel casting cylinder 3 (Fig. 5) axially.
  • the piston body 2 goes About a cone part 4 in the piston rod 5, with a drive, not shown for the axial movement is connected.
  • a piston groove 9 is attached to the piston body 2.
  • 2 to 4 show the sealing ring 11 made of spring steel with a slot 10 in the relaxed rest position, in which its outer diameter is larger than that Is the inside diameter of the casting cylinder and wherein the ring body 12 is an annular web 13 having.
  • the slot 10 is designed as a step slot, the slot surfaces 14, 15, 16, 17, 18, 19 extending in the circumferential direction and displaceable relative to one another in the circumferential direction, form sealing step transition surfaces 15, 18.
  • the sealing ring 11 In the relaxed rest position, the sealing ring 11 lies with the open slot 10 above it Piston web 6 of the piston 1 (FIG. 5) before it is inserted into the casting cylinder 3.
  • the sealing ring 11 When inserting the piston 1 into the casting cylinder 3, the sealing ring 11 is through the Tapered surface 20 pressed into its working position (Fig. 6), in which the Sealing ring 11 from the casting cylinder 3 with the ring body 12 against the piston web 6 and is pressed with the ring web 13 into the piston groove 9, but itself because of its spring property exerts a counterforce on the casting cylinder.
  • the inside diameter of the Casting cylinder 3, the outer diameter of the sealing ring 11 and the outer diameter of the piston body 2 are almost identical, but in the above Order should be minimally smaller.

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

Abstract

The sealing ring (11) with an annular ridge (13) engages with a piston groove (9) between the piston body (2) and the head section (6) of the piston (1). The slit (10) of the sealing ring is a stepped slit with sealing surfaces (15, 18) which can slide along one another in the circumferential direction of the ring.

Description

Die vorliegende Erfindung betrifft einen Kolben für einen Giesszylinder einer Warmkammer-Druckgiessmaschine und betrifft weiter einen Dichtungsring für einen solchen Kolben.The present invention relates to a piston for a casting cylinder of a hot chamber die casting machine and further relates to a sealing ring for such a piston.

Bei einer Warmkammer-Druckgiessmaschine ist es bekannt, in einem mit der zu vergiessenden Schmelze gefüllten Tiegel einen senkrecht stehenden Giesszylinder anzuordnen, in dem ein Kolben axial verschiebbar gelagert ist. In der obern Hälfte sind im Giesszylinder Einflussöffnungen für die Schmelze und unten ist eine Ausflussöffnung angebracht, die über ein Steigrohr mit der Giessform verbunden ist. Somit strömt bei jeder Aufwärtsbewegung des Kolbens eine bestimmte Menge Schmelze in den Giesszylinder, die bei der nachfolgenden Abwärtsbewegung in die Giessform gedrückt wird.In the case of a hot chamber die casting machine, it is known to coincide with the one to be cast To arrange the melt-filled crucible a vertical casting cylinder, in which a piston is axially slidably mounted. The top half are in the casting cylinder Influence openings for the melt and at the bottom there is an outflow opening that is connected to the casting mold via a riser pipe. Thus flows with every upward movement of the piston a certain amount of melt in the casting cylinder, which in the subsequent Downward movement is pressed into the mold.

Das Problem bei einer Warmkammer-Druckgiessmaschine besteht nun darin, Aussendurchmesser des Kolbens und Innendurchmesser des Giesszylinders so aufeinander abzustimmen, dass die Axialbewegung des Kolbens optimal erfolgen kann. Bei zu grossem Kolbendurchmesser klemmt der Kolben, während bei zu kleinem Kolbendurchmesser Schmelze zwischen Kolben und Giesszylinder eindringt und sich verfestigen kann, was in beiden Fällen zur frühzeitigen Zerstörung des Kolbens oder zusätzlich auch des Giesszylinders führen kann. Um dies zu verhindern, ist in der US-PS 5 350 007 eine Warmkammer-Druckgiessmaschine offenbart, bei der die Kolbenoberfläche mindestens eine Ringnut aufweist, die über Radialkanäle mit einem zur Stimseite des Kolbens führende Axialkanal verbunden ist. Dabei sind in der Ringnut mindestens zwei Ringsegmente lose angeordnet, die beim Arbeitshub des Kolbens durch das durch die Kanäle fliessende flüssige Metall an den Innenmantel des Giesszylinders angedrückt werden und somit als Dichtungsring wirken. Der Nachteil dieser Lösung besteht aber darin, dass flüssiges Metall auch zwischen Kolben und Giesszylinder in Richtung zur Kolbenstange hin eindringen und sich verfestigen kann mit der möglichen Zerstörung von Kolben und Giesszylinder zusätzlich ist die Fertigung des Kolbens äusserst kompliziert und teuer. Ferner ist in der EP-PS 423 413 ein Dichtungsring für die Kappe eines Trägerkörpers zur Verwendung in einer Kaltkammer-Druckgusspresse offenbart, der aber nicht in einer Warmkammer-Druckgiessmaschine verwendet werden kann.The problem with a hot chamber die casting machine is now outside diameter of the piston and inner diameter of the casting cylinder so that they match that the axial movement of the piston can take place optimally. If the piston diameter is too large the piston jams while the melt is too small penetrates between the piston and the casting cylinder and can solidify, which in both cases lead to the premature destruction of the piston or additionally of the casting cylinder can. To prevent this, there is a hot chamber die casting machine in US Pat. No. 5,350,007 discloses, in which the piston surface has at least one annular groove is connected via radial channels to an axial channel leading to the end face of the piston. At least two ring segments are loosely arranged in the ring groove, which are during the working stroke of the piston through the liquid metal flowing through the channels to the inner jacket of the casting cylinder are pressed and thus act as a sealing ring. Of the The disadvantage of this solution is that liquid metal is also between the piston and The casting cylinder can penetrate towards the piston rod and solidify with The possible destruction of pistons and casting cylinders is also the manufacture of the Pistons extremely complicated and expensive. Furthermore, a sealing ring is in EP-PS 423 413 for the cap of a carrier body for use in a cold chamber die casting press disclosed, but which are not used in a hot chamber die casting machine can.

Der Erfindung liegt daher die Aufgabe zugrunde, die beschriebenen Nachteile zu vermeiden und einen Kolben für einen Giesszylinder einer Warmkammer-Druckgiessmaschine zu schaffen, der bei einfacher und nicht teurer Konstruktion eine sichere Abdichtung gewährleistet. Es ist ferner Aufgabe der Erfindung, einen Dichtungsring für einen solchen Kolben zu schaffen, der sich durch gute Dichtwirkung auszeichnet und einfach auswechselbar ist, da im Falle einer Beschädigung bei einer Verfestigung von Metall nur der Dichtungsring beschädigt werden soll.The invention is therefore based on the object of avoiding the disadvantages described and a piston for a casting cylinder of a hot chamber die casting machine create that ensures a secure seal with simple and not expensive construction. It is also an object of the invention to provide a sealing ring for such a piston to create, which is characterized by a good sealing effect and is easy to replace, since in the event of damage when metal solidifies, only the sealing ring is damaged shall be.

Die Aufgabe wird durch einen Dichtungsring mit den in Anspruch 1 angegebenen Merkmalen und einen Kolben mit den in Anspruch 4 angegebenen Merkmalen gelöst. Mit der stufenförmigen Ausbildung des Schlitzes wird die Dichtfunktion des Dichtungsringes immer, selbst in der entspannten Ruhelage erfüllt. Mit der Ausbildung des Dichtungsringes gemäss Anspruch 2 übt er beständig eine Anpresskraft auf den Giesszylinder aus. Ein Dichtungsring gemäss Anspruch 3 ist besonders gut zum Vergiessen von Zinklegierungen geeignet. Ein Kolben gemäss Anspruch 5 ergibt hervorragende Dichwirkung und homogenen Druckaufbau des Giessmetalls, gestattet eine kleine Baulänge von Giesszylinder und Kolben und eine einfache Auswechselbarkeit des Dichtungsringes. Beim Kolben gemäss Anspruch 6 wird bei einer Verfestigung von Giessmetall zuerst der Dichtungsring beschädigt, so dass nur dieser ausgewechselt werden muss.The object is achieved by a sealing ring with the features specified in claim 1 and a piston with the features specified in claim 4 solved. With the step-shaped Formation of the slot, the sealing function of the sealing ring is always fulfilled even in the relaxed rest position. With the formation of the sealing ring according to Claim 2 he constantly exerts a pressing force on the casting cylinder. A sealing ring According to claim 3 is particularly well suited for casting zinc alloys. A piston according to claim 5 gives excellent sealing effect and homogeneous pressure build-up of the casting metal, allows a small overall length of the casting cylinder and piston and easy interchangeability of the sealing ring. In the piston according to claim 6 If the casting metal solidifies, the sealing ring is first damaged, so that only this needs to be replaced.

Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung näher erläutert. Darin zeigen:

Fig. 1
eine Seitenansicht auf einen Kolben, der noch nicht mit einem Dichtungsring versehen ist,
Fig. 2
eine seitliche, stark vergrösserte Ansicht von aussen auf den Dichtungsring,
Fig. 3
eine Seitenansicht von innen auf den Dichtungsring,
Fig. 4
eine Ansicht von oben auf den Dichtungsring,
Fig. 5
die Ansicht wie in Fig. 1, aber mit auf dem Kolben aufgesetzten Dichtungsring vor dem Einsetzen in den Giesszylinder und
Fig. 6
die Ansicht wie in Fig. 5, wenn der Kolben im Giesszylinder eingesetzt ist.
An exemplary embodiment of the invention is explained in more detail below with reference to the drawing. In it show:
Fig. 1
a side view of a piston which is not yet provided with a sealing ring,
Fig. 2
a lateral, greatly enlarged view from the outside of the sealing ring,
Fig. 3
a side view from the inside of the sealing ring,
Fig. 4
a top view of the sealing ring,
Fig. 5
the view as in Fig. 1, but with the sealing ring placed on the piston before insertion into the casting cylinder and
Fig. 6
the view as in Fig. 5 when the piston is inserted in the casting cylinder.

Der Kolben 1 aus Stahl ist mit seinem Kolbenkörper 2 (Fig. 1) im nur angedeuteten, ebenfalls aus Stahl bestehendem Giesszylinder 3 (Fig. 5) axial geführt. Der Kolbenkörper 2 geht über einen Kegelteil 4 in die Kolbenstange 5 über, die mit einem nicht dargestellten Antrieb für die Axialbewegung verbunden ist. Zwischen einem Kolbensteg 6 mit Abschrägung 7, der in einen Anschlag 8 übergeht, und dem Kolbenkörper 2 ist eine Kolbennut 9 angebracht. Die Fig. 2 bis 4 zeigen den mit einem Schlitz 10 versehenen Dichtungsring 11 aus Federstahl in der entspannten Ruhelage, in welcher sein Aussendurchmesser grösser als der Innendurchmesser des Giesszylinders ist und wobei der Ringkörper 12 einen Ringsteg 13 aufweist. Der Schlitz 10 ist als Stufenschlitz ausgebildet, dessen Schlitzflächen 14, 15, 16, 17, 18, 19 in Umfangsrichtung verlaufende und in Umfangsrichtung gegeneinander verschiebbare, dichtende Stufen-Übergangsflächen 15, 18 bilden.The piston 1 made of steel with its piston body 2 (FIG. 1) is also only indicated made of steel casting cylinder 3 (Fig. 5) axially. The piston body 2 goes About a cone part 4 in the piston rod 5, with a drive, not shown for the axial movement is connected. Between a piston web 6 with bevel 7, the passes into a stop 8, and a piston groove 9 is attached to the piston body 2. 2 to 4 show the sealing ring 11 made of spring steel with a slot 10 in the relaxed rest position, in which its outer diameter is larger than that Is the inside diameter of the casting cylinder and wherein the ring body 12 is an annular web 13 having. The slot 10 is designed as a step slot, the slot surfaces 14, 15, 16, 17, 18, 19 extending in the circumferential direction and displaceable relative to one another in the circumferential direction, form sealing step transition surfaces 15, 18.

In der entspannten Ruhelage liegt der Dichtungsring 11 mit offenem Schlitz 10 über dem Kolbensteg 6 des Kolbens 1 (Fig. 5), bevor dieser in den Giesszylinder 3 eingesetzt wird. Beim Einsetzen des Kolbens 1 in den Giesszylinder 3 wird der Dichtungsring 11 durch die Kegelmantelfläche 20 in seine Arbeitsstellung zusammengepresst (Fig. 6), in welcher der Dichtungsring 11 vom Giesszylinder 3 mit dem Ringkörper 12 gegen den Kolbensteg 6 und mit dem Ringsteg 13 in die Kolbennut 9 gedrückt wird,selbst aber wegen seiner Federeigenschaft eine Gegenkraft auf den Giesszylinder ausübt. Der Innendurchmesser des Giesszylinders 3, der Aussendurchmesser des Dichtungsringes 11 und der Aussendurchmesser des Kolbenkörpers 2 stimmen beinahe überein, wobei sie aber in der genannten Reihenfolge minimal kleiner sein sollen.In the relaxed rest position, the sealing ring 11 lies with the open slot 10 above it Piston web 6 of the piston 1 (FIG. 5) before it is inserted into the casting cylinder 3. When inserting the piston 1 into the casting cylinder 3, the sealing ring 11 is through the Tapered surface 20 pressed into its working position (Fig. 6), in which the Sealing ring 11 from the casting cylinder 3 with the ring body 12 against the piston web 6 and is pressed with the ring web 13 into the piston groove 9, but itself because of its spring property exerts a counterforce on the casting cylinder. The inside diameter of the Casting cylinder 3, the outer diameter of the sealing ring 11 and the outer diameter of the piston body 2 are almost identical, but in the above Order should be minimally smaller.

Claims (6)

Mit einem Schlitz versehener Dichtungsring für einen in einem Giesszylinder einer Warmkammer-Druckgiessmaschine mittels eines Kolbenkörpers axial verschiebbaren Kolben, dadurch gekennzeichnet, dass der Dichtungsring (11) einen Ringsteg (13) für den Eingriff in eine zwischen einem Kolbensteg (6) und dem Kolbenkörper (2) angeordnete Kolbennut (9) aufweist und dass der Schlitz (10) als Stufenschlitz ausgebildet ist, dessen Schlitzflächen (14, 15, 16, 17, 18, 19) in Umfangsrichtung verlaufende und in Umfangsrichtung gegeneinander verschiebbare, dichtende Stufen-Übergangsflächen (15, 18) bilden.Slotted sealing ring for one in a casting cylinder Hot chamber die casting machine axially displaceable by means of a piston body Piston, characterized in that the sealing ring (11) for a ring web (13) the engagement in a between a piston web (6) and the piston body (2) Has piston groove (9) and that the slot (10) is designed as a step slot is, the slot surfaces (14, 15, 16, 17, 18, 19) extending in the circumferential direction and in the circumferential direction mutually displaceable, sealing step transition surfaces (15, 18) form. Dichtungsring nach Anspruch 1, dadurch gekennzeichnet, dass er aus Federstahl bestehtund in der entspannten Ruhelage einen grösseren Aussendurchmesser als der Innendurchmesser des Giesszylinders (3) aufweist.Sealing ring according to claim 1, characterized in that it consists of spring steel and in the relaxed rest position a larger outside diameter than that Has inside diameter of the casting cylinder (3). Dichtungsring nach Anspruch 2, dadurch gekennzeichnet, dass er aus hochlegiertem, warmfesten Federstahl besteht.Sealing ring according to claim 2, characterized in that it is made of high-alloy, heat-resistant spring steel. Mittels eines Kolbenkörpers axial verschiebbarer Kolben für einen Giesszylinder einer Warmkammer-Druckgiessmaschine, welcher Kolben einen mit einem Schlitz versehenen Dichtungsring aufweist, dadurch gekennzeichnet, dass der Kolben (1) zwischen Kolbenkörper (2) und einem Kolbensteg (6) eine Kolbennut (9) für den Eingriff eines Ringstegs (13) des Dichtungsringes (11) aufweist und dass der Schlitz (10) als Stufenschlitz ausgebildet ist, dessen Schlitzflächen (14, 15, 16, 17, 18, 19) in Umfangsrichtung verlaufende und in Umfangsrichtung gegeneinander verschiebbare, dichtende Stufen-Übergangsflächen (15, 18) bilden.Piston axially displaceable for a casting cylinder by means of a piston body Hot chamber die casting machine, which piston has a slot Sealing ring, characterized in that the piston (1) between Piston body (2) and a piston web (6) a piston groove (9) for the engagement of a Has ring web (13) of the sealing ring (11) and that the slot (10) as a step slot is formed, the slot surfaces (14, 15, 16, 17, 18, 19) in the circumferential direction extending and circumferentially displaceable, sealing Form step transition surfaces (15, 18). Kolben nach Anspruch 4, dadurch gekennzeichnet, dass der Dichtungsring (11) an die Stirnseite des Kolbenkörpers (2) angrenzend in die Kolbennut (9) einsetzbar ist.Piston according to claim 4, characterized in that the sealing ring (11) to the Front side of the piston body (2) can be inserted adjacent to the piston groove (9). Kolben nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass bei in den Giesszylinder (3) eingesetztem Kolben (1) der Aussendurchmesser des Kolbenkörpers (2) minimal kleiner als der Aussendurchmesser des Dichtungsringes (11) und dieser minimal kleiner als der Innendurchmesser des Giesszylinders (3) ist.Piston according to claim 4 or 5, characterized in that in the casting cylinder (3) inserted piston (1) the outer diameter of the piston body (2) minimal smaller than the outer diameter of the sealing ring (11) and this minimal is smaller than the inside diameter of the casting cylinder (3).
EP19970810643 1997-09-09 1997-09-09 Plunger for a hot-chamber die-casting machine Expired - Lifetime EP0901852B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE59707737T DE59707737D1 (en) 1997-09-09 1997-09-09 Piston for a hot chamber die casting machine
ES97810643T ES2178746T3 (en) 1997-09-09 1997-09-09 PISTON FOR A PRESSURE FOUNDING MACHINE WITH HOT CAMERA.
EP19970810643 EP0901852B1 (en) 1997-09-09 1997-09-09 Plunger for a hot-chamber die-casting machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19970810643 EP0901852B1 (en) 1997-09-09 1997-09-09 Plunger for a hot-chamber die-casting machine

Publications (2)

Publication Number Publication Date
EP0901852A1 true EP0901852A1 (en) 1999-03-17
EP0901852B1 EP0901852B1 (en) 2002-07-17

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EP19970810643 Expired - Lifetime EP0901852B1 (en) 1997-09-09 1997-09-09 Plunger for a hot-chamber die-casting machine

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DE (1) DE59707737D1 (en)
ES (1) ES2178746T3 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10040578C1 (en) * 2000-08-18 2001-10-25 Kunz Susanne Plunger used in die casting, especially of aluminum has a hollow cylindrical sliding body mounted on a base, the sliding body being formed by at least one slit ring
WO2004110679A1 (en) * 2003-06-13 2004-12-23 Allper Ag Piston for a cold chamber die casting machine
WO2015054776A1 (en) 2013-10-18 2015-04-23 Exco Technologies Limited Wear ring for die-casting piston, die-casting piston incorporating same, and method of forming same
US10718433B2 (en) * 2017-05-05 2020-07-21 Exco Technologies Limited Wear ring for die-casting piston, and die-casting piston incorporating same

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1492043A (en) * 1922-08-17 1924-04-29 Mattson Leroy Piston and ring
DE742182C (en) * 1940-09-15 1943-11-24 Mueller Fritz Pressenfab Press ram for injection and compression molding machines
GB812536A (en) * 1957-10-11 1959-04-29 Dow Chemical Co Piston assembly
DE1080739B (en) * 1957-11-16 1960-04-28 Friedr Fingscheidt G M B H Pistons for die casting machines
DE1272492B (en) * 1965-05-03 1968-07-11 Gen Motors Corp Die casting machine
SU1752501A1 (en) * 1990-03-26 1992-08-07 Т.И, Кожокин Piston block of moulds used in die casting
US5350007A (en) * 1992-01-30 1994-09-27 Nippon Light Metal Co., Ltd. Injection apparatus for a hot-chamber die-cast machine
EP0423413B1 (en) * 1989-10-18 1997-04-02 Allper Ag Piston, especially for a pressure die casting apparatus

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1492043A (en) * 1922-08-17 1924-04-29 Mattson Leroy Piston and ring
DE742182C (en) * 1940-09-15 1943-11-24 Mueller Fritz Pressenfab Press ram for injection and compression molding machines
GB812536A (en) * 1957-10-11 1959-04-29 Dow Chemical Co Piston assembly
DE1080739B (en) * 1957-11-16 1960-04-28 Friedr Fingscheidt G M B H Pistons for die casting machines
DE1272492B (en) * 1965-05-03 1968-07-11 Gen Motors Corp Die casting machine
EP0423413B1 (en) * 1989-10-18 1997-04-02 Allper Ag Piston, especially for a pressure die casting apparatus
SU1752501A1 (en) * 1990-03-26 1992-08-07 Т.И, Кожокин Piston block of moulds used in die casting
US5350007A (en) * 1992-01-30 1994-09-27 Nippon Light Metal Co., Ltd. Injection apparatus for a hot-chamber die-cast machine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SOVIET PATENTS ABSTRACTS Section Ch Week 9330, Derwent World Patents Index; Class M22, AN 93-241611, XP002056560 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10040578C1 (en) * 2000-08-18 2001-10-25 Kunz Susanne Plunger used in die casting, especially of aluminum has a hollow cylindrical sliding body mounted on a base, the sliding body being formed by at least one slit ring
WO2004110679A1 (en) * 2003-06-13 2004-12-23 Allper Ag Piston for a cold chamber die casting machine
WO2015054776A1 (en) 2013-10-18 2015-04-23 Exco Technologies Limited Wear ring for die-casting piston, die-casting piston incorporating same, and method of forming same
CN106061653A (en) * 2013-10-18 2016-10-26 埃克斯科科技有限公司 Wear ring for die-casting piston, die-casting piston incorporating same, and method of forming same
JP2016533271A (en) * 2013-10-18 2016-10-27 エクスコ テクノロジーズ リミテッドＥｘｃｏ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｌｉｍｉｔｅｄ Wear ring for die-cast piston, die-cast piston incorporating wear ring, and method of forming wear ring
US9587742B2 (en) 2013-10-18 2017-03-07 Exco Technologies Limited Wear ring for die-casting piston, die-casting piston incorporating same, and method of forming same
EP3057726A4 (en) * 2013-10-18 2017-05-17 Exco Technologies Limited Wear ring for die-casting piston, die-casting piston incorporating same, and method of forming same
US10718433B2 (en) * 2017-05-05 2020-07-21 Exco Technologies Limited Wear ring for die-casting piston, and die-casting piston incorporating same

Also Published As

Publication number Publication date
EP0901852B1 (en) 2002-07-17
ES2178746T3 (en) 2003-01-01
DE59707737D1 (en) 2002-08-22

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