EP1992432B1 - Injection piston - Google Patents

Injection piston Download PDF

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Publication number
EP1992432B1
EP1992432B1 EP08466010.9A EP08466010A EP1992432B1 EP 1992432 B1 EP1992432 B1 EP 1992432B1 EP 08466010 A EP08466010 A EP 08466010A EP 1992432 B1 EP1992432 B1 EP 1992432B1
Authority
EP
European Patent Office
Prior art keywords
piston
casting
centering
rings
centring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP08466010.9A
Other languages
German (de)
French (fr)
Other versions
EP1992432A1 (en
Inventor
Ales Baloun
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Skoda Auto AS
Original Assignee
Skoda Auto AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Skoda Auto AS filed Critical Skoda Auto AS
Publication of EP1992432A1 publication Critical patent/EP1992432A1/en
Application granted granted Critical
Publication of EP1992432B1 publication Critical patent/EP1992432B1/en
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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 invention relates to a casting piston for casting light metal alloys under high pressure.
  • casting piston types are used for the technology of high pressure casting of Al and Mg alloys which move in a tempered or non-tempered horizontal or vertical steel casting chamber.
  • the casting piston presses the liquid metal into the actual casting mold.
  • the casting piston must be so tight in the chamber that it can come to no leakage of the metal under or up to the actual casting piston in the outward direction into the free space.
  • casting piston with self-expanding piston rings are used, on which the casting piston moves in the casting chamber, which leads to the lowering of the friction surfaces between the piston and the surface of the casting chamber.
  • the material for the piston rings is steel or alloys based on copper.
  • the centering of the casting piston in the casting chamber is necessary, the centering being known by means of guide pins incorporated in the body of the piston rod, which is the support of the casting piston, and by companies such as Kunz and Caro Prometa is used. Based on this, the object of the invention is the elimination of uneven wear of the piston rings.
  • a casting piston formed by a housing which is fastened on a holder, which are fastened together on a piston rod and are displaceably mounted in a pressure casting chamber, wherein at least three centering elements are arranged on the circumference of the piston housing.
  • the centering elements are either fixed by Zentrierlinsen in the centering holes by means of fastening screws or by centering, stored in the centering and fixed by means of clamping plates
  • Another embodiment provides that the centering plates are provided with a recess and the clamping plates with a cam.
  • the listed execution of the casting piston increases the life of the piston rings, which is to their saving and also to save the replacement times worn piston rings and further to save on technological rejects that arise in an exchange of the piston ring due to the interruption of the automatic casting cycle comes.
  • Fig. 1 a pressure casting chamber with the casting piston in section
  • Fig. 2 a front view of the casting piston with centering lenses
  • Fig. 3 the section through the casting piston with centering lenses in the plane AA
  • Fig. 4 a front view of the casting piston with Zentrierplättchen
  • Fig. 5 represent a section through the casting piston with Zentrierplättchen in the plane DD.
  • the casting piston 1 is formed by a holder 3 , to which a housing 2 of the casting piston 1 is attached. This assembly is attached to a piston rod 6 . On the housing 2 of the casting piston 1 are mounted in grooves 4 piston rings 5. The casting piston 1 is slidably mounted in a die casting chamber 7 . As in further Fig. 3 and 5 visible, located at the perimeter of the casting piston 1 is advantageous to 120 ° divided centering 8. As a centering elements Zentrierlinsen 8 'or 8 Zentrierplättchen "the shape of the letter C is used. The Zentrierlinsen 8' are fastened in centering openings 9 by means of fastening screws 10.
  • the Centering plates 8 " are arranged in a centering groove 11, which is formed on the circumference of the holder 3 , and these are provided with recesses 15 .
  • the centering 11 is the position of the centering 8 "delimited by means of the platens 12, which are provided on each side with a cam 16 which fit into the recesses 15 of the adjacent centering plates 8".
  • the casting piston 1 is guided in the die casting chamber 7 on the one hand by means of the piston rings 5 and on the other hand by means of the centering elements 8 .
  • the casting piston with centering elements mounted on the casting piston can be used in any high pressure casting technology, where both casting piston with piston rings on the principle of spreading by the underflow of the alloy to be cast (used for casting production) under the casting piston rings, as well in the casting piston with expanding rings without the use of the principle of injecting the alloy to be cast under the piston rings of the casting piston.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Description

Die Erfindung betrifft einen Gießkolben zum Abgießen von Leichtmetalllegierungen unter hohem Druck.The invention relates to a casting piston for casting light metal alloys under high pressure.

Gegenwärtig werden für die Technologie des Hochdruckgießens von Al- und Mg-Legierungen verschiedene Gießkolbentypen verwendet, welche sich in einer temperierten oder nicht temperierten horizontalen oder vertikalen Stahlgießkammer bewegen. Bei der Bewegung des Gießkolbens nach vom in Richtung der Gießform in der Gießkammer drückt der Gießkolben das flüssige Metall in die eigentliche Gießform. Der Gießkolben muss in der Kammer so dicht sein, dass es zu keinem Auslaufen des Metalls unter oder bis auf den eigentlichen Gießkolben in Richtung nach außen in den Freiraum kommen kann.At present, different casting piston types are used for the technology of high pressure casting of Al and Mg alloys which move in a tempered or non-tempered horizontal or vertical steel casting chamber. During the movement of the casting piston from in the direction of the casting mold in the casting chamber, the casting piston presses the liquid metal into the actual casting mold. The casting piston must be so tight in the chamber that it can come to no leakage of the metal under or up to the actual casting piston in the outward direction into the free space.

Aus der veröffentlichten Patentanmeldung SU 1266652 ist die Lösung bekannt, wo auf dem kegelförmigen Körper der Kolbenstange verschiebbar nacheinander Ringe angeordnet sind, welche mittels einer Stütz- und Sicherungsmutter gesichert sind. Mittels dieser Ringe wird der Kolben in der Gießkammer fest geführt und zentriert. Wenn sich die Ringe während des Betriebs abnutzen, dann kommt es durch eine Teilumdrehung der Stützmutter zu deren Verschiebung auf dem Kegelkörper, zu einer anschließenden Verspreizung und Einstellung des geforderten Ringdurchmessers.From the published patent application SU 1266652 the solution is known, where on the conical body of the piston rod slidably successively rings are arranged, which are secured by means of a support and lock nut. By means of these rings, the piston is firmly guided in the casting chamber and centered. If the rings wear during operation, then it comes through a partial rotation of the support nut to their displacement on the cone body, to a subsequent expansion and adjustment of the required ring diameter.

Aus diesen Gründen werden Gießkolben mit selbst verspreizenden Kolbenringen verwendet, auf welchen sich der Gießkolben in der Gießkammer bewegt, womit es zur Absenkung der Reibflächen zwischen dem Kolben und der Oberfläche der Gießkammer kommt. Das Material für die Kolbenringe ist Stahl oder Legierungen auf Kupferbasis.For these reasons, casting piston with self-expanding piston rings are used, on which the casting piston moves in the casting chamber, which leads to the lowering of the friction surfaces between the piston and the surface of the casting chamber. The material for the piston rings is steel or alloys based on copper.

Es ist im Allgemeinen bekannt, dass bei den horizontalen Gießkammern aufgrund des Einflusses der Gravitationskräfte und des verhältnismäßig großen Gewichts des Gießkolbens mit Kolbenringen, dessen Trägers (der Kolbenstange) und weiterer Elemente zu einer größeren und intensiveren Abnutzung im unteren Teil der Kammer und der Kolbenringe durch das Aufsitzen des gesamten Zusammenbauteils auf den unteren Teil der Gießkammer kommt.It is generally known that in the horizontal casting chambers due to the influence of gravitational forces and the relatively large weight of the casting piston piston rings, the carrier (the piston rod) and other elements to a larger and more intense wear in the lower part of the chamber and the piston rings the seating of the entire assembly part on the lower part of the casting chamber comes.

Bei den Gießkolben, bei denen für die Verspreizung der Kolbenringe in der Gießkammer das flüssige Metall und der Druck im System verwendet wird, wo das gegossene flüssige Metall bei der Kolbenbewegung in Richtung der eigentlichen Gießform unter den Kolbenring bzw. -ringe fließt, wodurch es bei deren Verspreizung in der Gießkammer behilflich ist, so kommt es zu einer ungleichmäßigen Abnutzung der Kolbenringe und dadurch auch zur abgesenkten Nutzbarkeit des eigentlichen Kolbenrings. In der Endkonsequenz sind häufigere Auswechslungen der Kolbenringe notwendig, mit negativem Einfluss auch auf die unproduktiven Zeiten, die für den eigentlichen Austausch der Ringe benötigt werden.In the casting piston, in which the liquid metal and the pressure in the system is used for the spreading of the piston rings in the casting chamber, where the molten metal flows during the piston movement in the direction of the actual casting mold under the piston ring or rings, whereby it their spread in the casting chamber is helpful, so there is an uneven wear of the piston rings and thereby also to the lowered usability of the actual piston ring. In the final consequence more frequent replacements of the piston rings are necessary, with negative influence also on the unproductive times, which are needed for the actual exchange of the rings.

Für die teilweise Eliminierung dieser negativen Erscheinung ist die Durchführung der Zentrierung des Gießkolbens in der Gießkammer notwendig, wobei die Zentrierung mittels Leitdornen, eingebaut in den Körper der Kolbenstange, welche der Träger des Gießkolbens ist, bekannt und von Firmen wie zum Beispiel Kunz und Caro Prometa benutzt ist. Ausgehend hiervon ist Aufgabe der Erfindung die Beseitigung der ungleichmäßigen Abnutzung der Kolbenringe.For the partial elimination of this negative phenomenon, the centering of the casting piston in the casting chamber is necessary, the centering being known by means of guide pins incorporated in the body of the piston rod, which is the support of the casting piston, and by companies such as Kunz and Caro Prometa is used. Based on this, the object of the invention is the elimination of uneven wear of the piston rings.

Diese Aufgabe wird durch einen Gießkolben mit Merkmalen des Anspruchs 1 gelöst.This object is achieved by a casting piston with features of claim 1.

Erfindungsgemäß wird ein Gießkolben vorgeschlagen, gebildet durch ein Gehäuse das auf einem Halter befestigt ist, die zusammen auf einer Kolbenstange befestigt und in einer Druckgießkammer verschiebbar gelagert sind, wobei am Umfang des Kolbengehäuses wenigstens drei Zentrierelemente angeordnet sind. Die Zentrierelemente sind entweder durch Zentrierlinsen in den Zentrieröffnungen mittels Befestigungsschrauben befestigt oder durch Zentrierplättchen, in der Zentriernut gelagert und mittels Spannplättchen fixiert Eine weitere Ausführungsform sieht vor, daß die Zentrierplättchen mit einer Aussparung und die spannplättchen mit einer Nocke versehen wird.According to the invention, a casting piston is proposed, formed by a housing which is fastened on a holder, which are fastened together on a piston rod and are displaceably mounted in a pressure casting chamber, wherein at least three centering elements are arranged on the circumference of the piston housing. The centering elements are either fixed by Zentrierlinsen in the centering holes by means of fastening screws or by centering, stored in the centering and fixed by means of clamping plates Another embodiment provides that the centering plates are provided with a recess and the clamping plates with a cam.

Die aufgeführte Ausführung des Gießkolbens erhöht die Lebensdauer der Kolbenringe, wodurch es zu deren Einsparung und auch zur Einsparung der Austauschzeiten abgenutzter Kolbenringe und weiter zur Einsparung technologischer Ausschussteile, die bei einem Austausch des Kolbenrings aufgrund der Unterbrechung des automatischen Gießzyklus entstehen, kommt.The listed execution of the casting piston increases the life of the piston rings, which is to their saving and also to save the replacement times worn piston rings and further to save on technological rejects that arise in an exchange of the piston ring due to the interruption of the automatic casting cycle comes.

Die Erfindung wird näher mittels Zeichnungen beschrieben, wobei Fig. 1 eine Druckgießkammer mit dem Gießkolben im Schnitt, Fig. 2 eine Vorderansicht des Gießkolbens mit Zentrierlinsen, Fig. 3 der Schnitt durch den Gießkolben mit Zentrierlinsen in der Ebene A-A, Fig. 4 eine Vorderansicht des Gießkolbens mit Zentrierplättchen und Fig. 5 einen Schnitt durch den Gießkolben mit Zentrierplättchen in der Ebene D-D darstellen.The invention will be described in more detail by means of drawings, wherein Fig. 1 a pressure casting chamber with the casting piston in section, Fig. 2 a front view of the casting piston with centering lenses, Fig. 3 the section through the casting piston with centering lenses in the plane AA, Fig. 4 a front view of the casting piston with Zentrierplättchen and Fig. 5 represent a section through the casting piston with Zentrierplättchen in the plane DD.

Laut Fig. 1, wird der Gießkolben 1 durch einen Halter 3 gebildet, an dem ein Gehäuse 2 des Gießkolbens 1 befestigt ist. Diese Gesamtheit ist an einer Kolbenstange 6 befestigt. Am Gehäuse 2 des Gießkolbens 1 befinden sich in Nuten 4 gelagert Kolbenringe 5. Der Gießkolben 1 ist verschiebbar in einer Druckgießkammer 7 gelagert. Wie weiter in Fig. 3 und 5 ersichtlich, befinden sich am Umfang des Gießkolbens 1 vorteilhaft zu je 120° aufgeteilt Zentrierelemente 8. Als Zentrierelemente werden Zentrierlinsen 8' bzw. Zentrierplättchen 8" der Form des Buchstaben C verwendet. Die Zentrierlinsen 8' sind in Zentrieröffnungen 9 mittels Befestigungsschrauben 10 befestigt. Die Zentrierplättchen 8" sind in einer Zentriernut 11, angeordnet, welche am Umfang des Halters 3 ausgebildet ist, und diese mit Aussparungen 15 versehen sind. In der Zentriernut 11 befindet sich die Position der Zentrierplättchen 8" abgegrenzt mittels der Spannplättchen 12, welche auf jeder Seite mit einer Nocke 16 versehen sind, die in die Aussparungen 15 der benachbarten Zentrierplättchen 8" passen. Nach der Befestigung der Spannplättchen 12 mittels Befestigungsschrauben 13 sind die Zentrierplättchen 8" sowohl gegen ein Verdrehen, als auch gegen eine Bewegung in radialer Richtung gesichert.Loud Fig. 1 , the casting piston 1 is formed by a holder 3 , to which a housing 2 of the casting piston 1 is attached. This assembly is attached to a piston rod 6 . On the housing 2 of the casting piston 1 are mounted in grooves 4 piston rings 5. The casting piston 1 is slidably mounted in a die casting chamber 7 . As in further Fig. 3 and 5 visible, located at the perimeter of the casting piston 1 is advantageous to 120 ° divided centering 8. As a centering elements Zentrierlinsen 8 'or 8 Zentrierplättchen "the shape of the letter C is used. The Zentrierlinsen 8' are fastened in centering openings 9 by means of fastening screws 10. The Centering plates 8 " are arranged in a centering groove 11, which is formed on the circumference of the holder 3 , and these are provided with recesses 15 . In the centering 11 is the position of the centering 8 "delimited by means of the platens 12, which are provided on each side with a cam 16 which fit into the recesses 15 of the adjacent centering plates 8". After the attachment of the clamping plates 12 by means of fastening screws 13 , the centering plates 8 "are secured against rotation as well as against movement in the radial direction.

Beim eigentlichen Gießprozess wird der Gießkolben 1 in der Druckgießkammer 7 einerseits mittels der Kolbenringe 5 und andererseits mittels der Zentrierelemente 8 geführt. Diese garantieren, dass es zu keiner Absenkung des Gießkolbens 1 in der Druckgießkammer 7 durch die Wirkung der Gravitationskräfte kommt, wodurch sowohl die Abnutzung der Kolbenringe 5 als auch die Beschädigung der Gießkolbenoberfläche 1 bzw. die Oberfläche der Druckgießkammer 7 verhindert wird.In the actual casting process, the casting piston 1 is guided in the die casting chamber 7 on the one hand by means of the piston rings 5 and on the other hand by means of the centering elements 8 . These guarantee that there is no lowering of the casting piston 1 in the pressure casting chamber 7 by the action of the gravitational forces, whereby both the wear of the piston rings 5 and the damage of the casting piston surface 1 and the surface of the pressure casting chamber 7 is prevented.

Der Gießkolben mit Zentrierelementen angebracht auf dem Gießkolben kann in jeder beliebigen Technologie des Gießens unter hohem Druck die Anwendung finden, wo sowohl Gießkolben mit Kolbenringen auf dem Prinzip der Verspreizung durch das Unterlaufen der zu gießenden Legierung (verwendet zur Gussteilproduktion) unter die Gießkolbenringe, als auch bei den Gießkolben mit verspreizenden Ringen ohne die Nutzung des Prinzips des Einspritzens der zu gießenden Legierung unter die Kolbenringe des Gießkolbens verwendet werden.The casting piston with centering elements mounted on the casting piston can be used in any high pressure casting technology, where both casting piston with piston rings on the principle of spreading by the underflow of the alloy to be cast (used for casting production) under the casting piston rings, as well in the casting piston with expanding rings without the use of the principle of injecting the alloy to be cast under the piston rings of the casting piston.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Gießkolbencasting plunger
22
Gehäusecasing
33
Halterholder
44
Nutgroove
55
Kolbenringpiston ring
66
Kolbenstangepiston rod
77
DruckgießkammerDruckgießkammer
88th
Zentrierelementcentering
8'8th'
ZentrierlinseZentrierlinse
8"8th"
ZentrierplättchenZentrierplättchen
99
Zentrieröffnungcentering
1010
Befestigungsschraubefixing screw
1111
Zentriernutcentering
1212
Spannplättchenclamping plates
1313
Spannschraubeclamping screw
1414
Spannöffnungclamping opening
1515
Aussparungrecess
1616
Nockecam

Claims (4)

  1. Casting piston (1), formed by a housing (2) which is secured on a holder (3), which together are secured on a piston rod (6) and are displaceable in a diecasting chamber (7), wherein the housing (2) is provided with piston rings (5),
    characterized
    in that the housing (2) is provided with at least three centring elements (8), which are arranged on the circumference of the housing (2).
  2. Casting piston (1) according to Claim 1,
    characterized
    in that the centring elements (8) are secured through centring lenses (8') in centring openings (9) by means of fastening screws (10).
  3. Casting piston (1) according to Claim 1,
    characterized
    in that the centring elements (8) are mounted through centring plates (8") in the centring groove (11) and fixed by means of clamping plates (12).
  4. Casting piston (1) according to Claim 3,
    characterized
    in that centring plates (8") are provided with a recess (15) and clamping plates (12) are provided with a projection (16).
EP08466010.9A 2007-05-15 2008-05-14 Injection piston Ceased EP1992432B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CZ2007-341A CZ307358B6 (en) 2007-05-15 2007-05-15 A casting piston

Publications (2)

Publication Number Publication Date
EP1992432A1 EP1992432A1 (en) 2008-11-19
EP1992432B1 true EP1992432B1 (en) 2013-08-14

Family

ID=39789892

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08466010.9A Ceased EP1992432B1 (en) 2007-05-15 2008-05-14 Injection piston

Country Status (2)

Country Link
EP (1) EP1992432B1 (en)
CZ (1) CZ307358B6 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7418104U (en) * 1974-11-21 De Trey Ges Mbh Registration set for determining the bite position for the design of dental prostheses
GB190502950A (en) * 1904-07-11 1905-12-07 John Sellers Bancroft Improvements in or relating to Adjusting or Centering Mechanisms for Type Casting, Composing and similar Machines.
US3726117A (en) * 1971-06-07 1973-04-10 Demag Ag Device and method for controlling the movement of a deformation roll
SU1266652A1 (en) 1985-05-11 1986-10-30 Специальное Конструкторское Бюро Машин Точного Литья При Тираспольском Ордена Октябрьской Революции Заводе Литейных Машин Им.С.М.Кирова Pressing piston for injection moulding machine
EP1057560A1 (en) * 1999-06-01 2000-12-06 Oskar Frech Gmbh & Co. Injection unit for a pressure diecasting machine

Also Published As

Publication number Publication date
EP1992432A1 (en) 2008-11-19
CZ307358B6 (en) 2018-06-27
CZ2007341A3 (en) 2008-11-26

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