EP1992432B1 - Giesskolben - Google Patents

Giesskolben 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)
English (en)
French (fr)
Other versions
EP1992432A1 (de
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/de
Application granted granted Critical
Publication of EP1992432B1 publication Critical patent/EP1992432B1/de
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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP08466010.9A 2007-05-15 2008-05-14 Giesskolben Ceased EP1992432B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CZ2007-341A CZ307358B6 (cs) 2007-05-15 2007-05-15 Licí píst

Publications (2)

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

Family

ID=39789892

Family Applications (1)

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

Country Status (2)

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

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7418104U (de) * 1974-11-21 De Trey Ges Mbh Registrierbesteck zur Bißlagenbestimmung für die Gestaltung von Zahnprothesen
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 (ru) 1985-05-11 1986-10-30 Специальное Конструкторское Бюро Машин Точного Литья При Тираспольском Ордена Октябрьской Революции Заводе Литейных Машин Им.С.М.Кирова Прессующий поршень машины лить под давлением
EP1057560A1 (de) * 1999-06-01 2000-12-06 Oskar Frech Gmbh & Co. Einpressaggregat für eine Druckgiessmaschine

Also Published As

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

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