EP0008858A1 - Pressform - Google Patents

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Publication number
EP0008858A1
EP0008858A1 EP79301399A EP79301399A EP0008858A1 EP 0008858 A1 EP0008858 A1 EP 0008858A1 EP 79301399 A EP79301399 A EP 79301399A EP 79301399 A EP79301399 A EP 79301399A EP 0008858 A1 EP0008858 A1 EP 0008858A1
Authority
EP
European Patent Office
Prior art keywords
furnace
manifold
die
dies
tubes
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.)
Withdrawn
Application number
EP79301399A
Other languages
English (en)
French (fr)
Inventor
Douglas Miller
Graham Broad
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.)
GKN Kent Alloys Ltd
Original Assignee
GKN Kent Alloys Ltd
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 GKN Kent Alloys Ltd filed Critical GKN Kent Alloys Ltd
Publication of EP0008858A1 publication Critical patent/EP0008858A1/de
Withdrawn legal-status Critical Current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
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould

Definitions

  • This invention relates to low-pressure die casting machines and will be described in relation to the manufacture of die-cast wheels. However the invention may be used in die casting machines designed for other purposes.
  • a conventional low-pressure die casting machine the die is arranged over a furnace in which the metal to be cast is maintained molten.
  • a feed tube leads down from the die and dips into the metal in the furnace.
  • gas pressure is applied to the surface of the metal in the furnace so that the metal flows up the feed tube into the die.
  • the latter is full the gas pressure is reduced and the metal in the feed tube descends once more into the furnace.
  • Some machines have two or more die sets and it has been proposed to have separate feed tubes from the furnace, one to each die set. Since the furnace crucible t p pers towards its bottom it is sometimes difficult to get these separate feed tubes in.
  • a low pressure die casting machine comprises a die base carrying two or more dies, a furnace for molten metal below the die base, a lid for the furnace spaced below the die base, a feed tube extending into the furnace, a manifold at the upper end of the tube and separate intermediate tubes extending upwardly from the manifold to each die, at least the lower part of the manifold being within the furnace whereby, when the machine is in use, heat from the furnace retains any ⁇ metal in the manifold in a molten condition.
  • This arrangement has two advantages over the last arrangement described above. Firstly, it is unnecessary to provide such an additional source of heat to maintain the metal in the Y-piece molten since such heat is provided by radiation and convection from the metal in the furnace. Secondly, because there is no external heat applied to the Y-piece, the die base can be kept cooler than heretofore and there can be some air space between the furnace lid and the die base.
  • the manifold may be entirely within the furnace and inside the furnace lid with the-intermediate tubes projecting through the lid. It is preferred, however, that the manifold be inset in the furnace lid and comprises a lower part extending through the lid and an upper, releasable cover above the lid.
  • the die base of the machine is indicated at 10. Beneath the die base is a furnace indicated generally at 11 and having a lid 12 which closes the top of the furnace. Within the lid 1? is an aperture 13.
  • a Y-shaped manifold Received in the aperture is a Y-shaped manifold indicated generally at 14.
  • the manifold has a lower part 15 having a spigot 16 to which is secured a feed tube 17 which extends downwardly into the furnace.
  • the upper edge of the lower part 15 is provided with a flange 18 which overlies the furnace lid 12 around the aperture 13 and is sealed thereto by a gasket 19.
  • the open top of the manifold is closed by a cover 20 which is sealed to the part 15 by a gasket 21.
  • the manifold, feed tube and manifold cover may all be made from cast iron lined with a refactory material.
  • each end thereof the manifold cover Adjacent each end thereof the manifold cover is provided with an aperture 22 and surrounding the upper edge of the aperture is a rib 23. Received within each circular rib 23 is an intermediate tube 24, this tube being sealed to the manifold cover by a gasket 25.
  • the intermediate tubes 24 may be made of cast iron lined with refactory material and the sprue bushes may also be made of cast iron.
  • Each of the sprue bushes 26 leads to a die set, not shown, mounted above the die base.
  • molten metal in the furnace is forced up the feed tube 17 by gas pressure, normally air pressure, applied to the surface of the metal between that surface and the furnace lid 12.
  • gas pressure normally air pressure
  • the metal moves up the feed tube 17 into the manifold and from the manifold through the apertures into the intermediate tubes 24 and into the dies.
  • the air pressure is reduced so that the metal level in the feed tube and manifold falls. Normally the air pressure will be reduced until the molten metal level is within the manifold.
  • the metal in the manifold is retained molten due to heat applied to the manifold from the furnace by radiation and convection.
  • the invention provides an improved low-pressure die casting machine in which two or more dies are fed with molten metal from a common furnace.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP79301399A 1978-08-04 1979-07-13 Pressform Withdrawn EP0008858A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3232278 1978-08-04
GB7832322 1978-08-04

Publications (1)

Publication Number Publication Date
EP0008858A1 true EP0008858A1 (de) 1980-03-19

Family

ID=10498867

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79301399A Withdrawn EP0008858A1 (de) 1978-08-04 1979-07-13 Pressform

Country Status (2)

Country Link
EP (1) EP0008858A1 (de)
JP (1) JPS5524793A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0503675A1 (de) * 1991-03-13 1992-09-16 Fuji Electric Co., Ltd. Ofen für Niederdruckguss
WO1998043761A1 (en) * 1997-03-31 1998-10-08 Thomas, Margaretann, M. Pressurized squeeze casting apparatus and method
KR101460572B1 (ko) * 2013-01-10 2014-11-13 현대성우오토모티브코리아 주식회사 마그네슘 합금용 저압주조기의 중간 스토크 및 이를 포함하는 저압주조기
CN106141142A (zh) * 2016-08-08 2016-11-23 无锡蠡湖增压技术股份有限公司 一种电加热分流器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1280505B (de) * 1964-07-02 1968-10-17 American Radiator & Standard Verfahren zum Druckgiessen duennwandiger Metallteile
US3656539A (en) * 1969-01-29 1972-04-18 Amsted Ind Inc Apparatus for casting molten metal
DE2438060A1 (de) * 1973-08-10 1975-02-27 Kohaszati Gyarepitoe Vallalat Niederdruck giesseinrichtung
DE2548215A1 (de) * 1974-11-04 1976-05-13 Activite Atom Avance Niederdruck-schnellgussanlage
US4076070A (en) * 1974-10-09 1978-02-28 Regie Nationale Des Usines Renault Low-pressure diecasting machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1280505B (de) * 1964-07-02 1968-10-17 American Radiator & Standard Verfahren zum Druckgiessen duennwandiger Metallteile
US3656539A (en) * 1969-01-29 1972-04-18 Amsted Ind Inc Apparatus for casting molten metal
DE2438060A1 (de) * 1973-08-10 1975-02-27 Kohaszati Gyarepitoe Vallalat Niederdruck giesseinrichtung
US4076070A (en) * 1974-10-09 1978-02-28 Regie Nationale Des Usines Renault Low-pressure diecasting machine
DE2548215A1 (de) * 1974-11-04 1976-05-13 Activite Atom Avance Niederdruck-schnellgussanlage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
GIESSEREI-PRAXIS Nr. 18, 1973, Berlin, G.G. WARTEY "Niederdruck-Kokillenguss" pages 329 to 336 * page 333; fig. 6 and 7 * *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0503675A1 (de) * 1991-03-13 1992-09-16 Fuji Electric Co., Ltd. Ofen für Niederdruckguss
US5259595A (en) * 1991-03-13 1993-11-09 Fuji Electric Co., Ltd. Pressure pouring furnace
US5906235A (en) * 1995-06-16 1999-05-25 Thomas Robert Anthony Pressurized squeeze casting apparatus and method and low pressure furnace for use therewith
WO1998043761A1 (en) * 1997-03-31 1998-10-08 Thomas, Margaretann, M. Pressurized squeeze casting apparatus and method
KR101460572B1 (ko) * 2013-01-10 2014-11-13 현대성우오토모티브코리아 주식회사 마그네슘 합금용 저압주조기의 중간 스토크 및 이를 포함하는 저압주조기
CN106141142A (zh) * 2016-08-08 2016-11-23 无锡蠡湖增压技术股份有限公司 一种电加热分流器

Also Published As

Publication number Publication date
JPS5524793A (en) 1980-02-22

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB IT NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19801231

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BROAD, GRAHAM

Inventor name: MILLER, DOUGLAS