EP0901852B1 - Piston pour une machine à couler sous pression à chambre chaude - Google Patents

Piston pour une machine à couler sous pression à chambre chaude Download PDF

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Publication number
EP0901852B1
EP0901852B1 EP19970810643 EP97810643A EP0901852B1 EP 0901852 B1 EP0901852 B1 EP 0901852B1 EP 19970810643 EP19970810643 EP 19970810643 EP 97810643 A EP97810643 A EP 97810643A EP 0901852 B1 EP0901852 B1 EP 0901852B1
Authority
EP
European Patent Office
Prior art keywords
piston
sealing ring
casting cylinder
slot
casting machine
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.)
Expired - Lifetime
Application number
EP19970810643
Other languages
German (de)
English (en)
Other versions
EP0901852A1 (fr
Inventor
André Müller
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP19970810643 priority Critical patent/EP0901852B1/fr
Priority to DE59707737T priority patent/DE59707737D1/de
Priority to ES97810643T priority patent/ES2178746T3/es
Publication of EP0901852A1 publication Critical patent/EP0901852A1/fr
Application granted granted Critical
Publication of EP0901852B1 publication Critical patent/EP0901852B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 present invention relates to an axially displaceable piston for use in a Casting cylinder of a die casting machine with a piston groove for receiving the ring land a sealing ring provided with a slot, the slot as a step slot is formed, the slot surfaces extending in the circumferential direction and in Sealing step transition surfaces which can be displaced relative to one another in the circumferential direction form.
  • 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; in addition, the manufacture of the Pistons extremely complicated and expensive.
  • a piston for a casting cylinder of a cold chamber die casting press is known, in which a cap with an annular groove through which a coolant flows is arranged.
  • a slot-shaped sealing ring engages in the ring groove, wherein the slot is designed as a step slot, the slot surfaces in Sealing step transition surfaces running circumferentially and displaceable in the circumferential direction form.
  • the cap ends in an approach that successively the annular groove, has an annular web and a boundary surface, the sealing ring with its Ring web and its ring groove accordingly in the ring groove and in the ring web of Approaches and with its boundary surface the ring web of the approach comprising radially opposite the boundary surface of the approach from the front
  • tests have shown that such a piston can be used in one Casting cylinder of a hot chamber die casting machine is unsuitable.
  • the invention is therefore based on the object of avoiding the disadvantages described and a piston for use in a casting cylinder of a hot chamber die casting machine to create the one with simple and not expensive construction secure sealing guaranteed.
  • the piston should also have a sealing ring, which is characterized by a good sealing effect and is easy to replace, because in the case If the metal is solidified, only the sealing ring is damaged shall be.
  • the object is achieved by a piston with the features specified in claim 1 solved.
  • the piston according to claim 2 when casting metal is solidified, first the sealing ring is damaged so that only this needs to be replaced. With a Piston according to claim 3, the sealing ring constantly exerts a pressing force on the Casting cylinder out.
  • the piston according to claim 4 is particularly suitable for potting Suitable zinc alloys.
  • 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.
  • 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.

Landscapes

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

Claims (4)

  1. Piston déplaçable axialement pour utilisation dans un cylindre de coulée d'une machine à couler sous pression, avec une rainure de piston (9) pour le logement du listel de piston (13) d'un anneau d'étanchéité (11) muni d'une fente (10), la fente étant formée comme fente à gradins dont les surfaces (14, 15, 16, 17, 18, 19) forment des surfaces de transition par gradins (15, 18) s'étendant dans le sens de la circonférence, étanches et déplaçables l'une contre l'autre dans le sens de la circonférence, caractérisé en ce que le piston (1) à utiliser dans une machine à couler sous pression à chambre chaude est formé de manière non refroidie, et en ce que la rainure de piston (9) est formée entre l'extrémité d'un corps de piston (2) et un talon de piston (6), de telle sorte que l'anneau d'étanchéité (11) a prise avec son listel de piston (13) dans la rainure de piston (9) et ne repose plus avec le corps de son anneau (12) que sur le talon de piston (6).
  2. Piston selon la revendication 1, caractérisé en ce que, dans le cas d'un piston (1) inséré dans le cylindre de coulée (3), le diamètre extérieur du corps du piston (2) est légèrement inférieur au diamètre extérieur de l'anneau d'étanchéité (11) et que celui-ci est légèrement inférieur au diamètre intérieur du cylindre de coulée (3).
  3. Piston selon la revendication 1 ou 2, caractérisé en ce que l'anneau d'étanchéité (11) est constitué d'acier à ressorts et présente, en position de repos détendue, un diamètre extérieur supérieur au diamètre intérieur du cylindre de coulée (3).
  4. Piston selon la revendication 3, caractérisé en ce que l'anneau d'étanchéité (11) est constitué d'acier à ressorts fortement allié, résistant aux températures élevées.
EP19970810643 1997-09-09 1997-09-09 Piston pour une machine à couler sous pression à chambre chaude Expired - Lifetime EP0901852B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP19970810643 EP0901852B1 (fr) 1997-09-09 1997-09-09 Piston pour une machine à couler sous pression à chambre chaude
DE59707737T DE59707737D1 (de) 1997-09-09 1997-09-09 Kolben für eine Warmkammer-Druckgiessmachine
ES97810643T ES2178746T3 (es) 1997-09-09 1997-09-09 Piston para una maquina de fundicion a presion con camara caliente.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19970810643 EP0901852B1 (fr) 1997-09-09 1997-09-09 Piston pour une machine à couler sous pression à chambre chaude

Publications (2)

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

Family

ID=8230371

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970810643 Expired - Lifetime EP0901852B1 (fr) 1997-09-09 1997-09-09 Piston pour une machine à couler sous pression à chambre chaude

Country Status (3)

Country Link
EP (1) EP0901852B1 (fr)
DE (1) DE59707737D1 (fr)
ES (1) ES2178746T3 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10040578C1 (de) * 2000-08-18 2001-10-25 Kunz Susanne Druckgießkolben, insbesondere für Vakuum-Druckgießmaschinen
DE20309181U1 (de) * 2003-06-13 2004-10-28 Allper Ag Mehrteiliger Kolben für eine Kaltkammer-Druckgießmaschine
JP2016533271A (ja) * 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 ダイカストピストンのための摩耗リング、摩耗リングを組み込んだダイカストピストン、及び、摩耗リングを形成する方法
US10718433B2 (en) * 2017-05-05 2020-07-21 Exco Technologies Limited Wear ring for die-casting piston, and die-casting piston incorporating same

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB812536A (en) * 1957-10-11 1959-04-29 Dow Chemical Co Piston assembly
US1492043A (en) * 1922-08-17 1924-04-29 Mattson Leroy Piston and ring
DE742182C (de) * 1940-09-15 1943-11-24 Mueller Fritz Pressenfab Pressstempel fuer Spritz- und Pressgiessmaschinen
DE1080739B (de) * 1957-11-16 1960-04-28 Friedr Fingscheidt G M B H Kolben fuer Druckgiessmaschinen
US3300822A (en) * 1965-05-03 1967-01-31 Gen Motors Corp Die casting plunger piston ring
ES2102354T3 (es) * 1989-10-18 1997-08-01 Allper Ag Embolo, para un aparato de colada bajo presion.
SU1752501A1 (ru) * 1990-03-26 1992-08-07 Т.И, Кожокин Поршневой узел машины лить под давлением
JP2517509B2 (ja) * 1992-01-30 1996-07-24 日本軽金属株式会社 ホットチャンバ―ダイカストマシンの射出用プランジャ―

Also Published As

Publication number Publication date
EP0901852A1 (fr) 1999-03-17
DE59707737D1 (de) 2002-08-22
ES2178746T3 (es) 2003-01-01

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