WO2000076696A1 - Procede de coulee et moules multiples - Google Patents

Procede de coulee et moules multiples Download PDF

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Publication number
WO2000076696A1
WO2000076696A1 PCT/DK1999/000308 DK9900308W WO0076696A1 WO 2000076696 A1 WO2000076696 A1 WO 2000076696A1 DK 9900308 W DK9900308 W DK 9900308W WO 0076696 A1 WO0076696 A1 WO 0076696A1
Authority
WO
WIPO (PCT)
Prior art keywords
mould
string
article
runner
mould cavity
Prior art date
Application number
PCT/DK1999/000308
Other languages
English (en)
Inventor
Uffe Andersen
Original Assignee
Georg Fischer Disa A/S
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 Georg Fischer Disa A/S filed Critical Georg Fischer Disa A/S
Priority to PCT/DK1999/000308 priority Critical patent/WO2000076696A1/fr
Priority to AU42568/99A priority patent/AU4256899A/en
Publication of WO2000076696A1 publication Critical patent/WO2000076696A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D47/00—Casting plants
    • B22D47/02—Casting plants for both moulding and casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C11/00—Moulding machines characterised by the relative arrangement of the parts of same
    • B22C11/10—Moulding machines characterised by the relative arrangement of the parts of same with one or more flasks forming part of the machine, from which only the sand moulds made by compacting are removed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/20—Stack moulds, i.e. arrangement of multiple moulds or flasks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/22—Moulds for peculiarly-shaped castings
    • B22C9/28—Moulds for peculiarly-shaped castings for wheels, rolls, or rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
    • B22D15/005—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of rolls, wheels or the like

Definitions

  • the present invention relates to a method of casting articles having an axis of rotational symmetry in vertically parted sand mould parts of a mould-string plant, as defined in the preamble of claim 1. Further the invention relates to a mould string of vertically parted sand mould parts of a mould-string plant for casting such articles as defined the preamble of claim 12, and to articles produced with said method or said mould string.
  • the orifice at the point where the runner meets the mould cavity, through which the molten metal enters the mould cavity, is thus a narrow slot and has consequently a small cross-sectional area.
  • the opening of the runner into the mould cavity centrally, the maximum distance between the opening and the periphery of the mould cavity is reduced.
  • the molten metal may according to an embodiment be introduced by counter-gravity delivery.
  • the runner continues in an embodiment upwardly from the centre of the mould cavity to form a feeder.
  • the casting cavities may according to an embodiment be placed in the mould string, one above another in one or more stacks.
  • the runner continues in an embodiment upwardly from the centre of the lowest mould cavity of a stack to the centre of each of the casting cavities above the lowest mould cavity. Between the mould cavities in a stack, the runner can be formed with an enlarged cross-sectional area to form feeders for the mould cavity below.
  • At least one core may be provided in the mould cavity placed within the circumference of the article to be cast from a part of the side surface of the article.
  • two cores may be provided in the mould cavity, placed within the circumference of the article to be cast to form a part of the respective side surface of the article. According to an embodiment, the two cores rest upon one another.
  • Articles that can be produced with the method and the mould string are for example light-alloy wheels for a motor vehicle.
  • the method and the mould string offer in particular advantages in connection with casting such light-alloy wheels.
  • the cores which are usually made of a finer sand quality than the mould parts, are in accordance with the invention placed on the sides of the wheel to be cast. This is particularly advantageous since the side wheel that will be visible when the wheel is used on a motor vehicle has the highest surface quality demands.
  • the finer sand quality of the core facilitates obtaining the required surface quality of the visible side of the wheel.
  • a further advantage of placing the cores at the side of the wheel is that the core defines the "design" of the visible side of the wheel.
  • the method and mould according to the present invention offer an advantage in that the "design" of the visible side of the wheel can be changed by simply interchanging the core.
  • Fig. 1 shows a diagrammatic side view of a mould-string plant
  • Fig. 2 shows a detailed cross-sectional view of a part of a mould string with cast articles including the runner therein in accordance with the invention
  • Fig. 3 shows a view at the parting surface of one mould part with two cast articles including the runner and the cores therein, with the other mould part that defined the mould cavity being removed
  • Fig. 4 shows an elevated view of two cast articles together with the runner
  • Fig. 5 shows an exploded view of the cores.
  • Fig. 1 is a diagrammatic longitudinal sectional view through a string moulding plant comprising a combined mould making and casting apparatus, e.g. of the "DISAMATIC ®" type.
  • This apparatus as such is dealt with in GB-848,604, which describes the mode of operation, and for this reason it is only dealt with briefly in this specification.
  • Box-less mould parts 5 made from green sand, i.e. sand with moist clay as binder supplied from a hopper 1 to a moulding chamber 2 defined between a pattern located on a movable piston 3 and a pattern located on a movable and upwardly pivotable counter pressure plate 4 in a downwardly pivoted position (not shown) of the counter pressure plate 4.
  • the green sand is compacted by the piston 3 to form a mould part 5
  • the counter-pressure plate is conveyed forward and pivoted upwards to the position shown in Fig.
  • the mould string the front side of a mould part 5 together with the rear side of the previous mould part 5 defines at least one mould cavity 6 and a runner 9 for guiding the molten metal to a mould cavity 6.
  • the filling takes place at a filling station (not shown) after which the mould parts are further advanced stepwise through a casting zone to a shake-out grill (not shown).
  • the molten metal is supplied to the mould cavity by counter-gravity delivery.
  • the casting apparatus comprises a heated and sealed reservoir containing molten metal and comprises in short the following operational components:
  • a shutter mechanism to close the inlet after filling the mould to enable forward transportation of the mould string before the inlet freezes naturally.
  • one or more cores 13, 14 are placed in the mould cavity as shown in Fig. 1 by a core setter apparatus (not shown).
  • Fig. 2 shows a cross-sectional view of a part of the mould string in more detail.
  • Two mould parts 5 together define the mould cavities 6, the runner 9 and the gating system.
  • the runner 9 starts at the lower part of the side of the mould string and continues upwardly towards the centre of the mould cavity 6 of the lower one of the moulding cavities 6.
  • the runner is provided with a feeder 20.
  • the runner 9 continues with an enlarged section 21 which functions as an feeder for the lowest mould cavity, thereafter continues towards the higher mould cavity.
  • the runner 9 continues then with an enlarged section 22 functioning as a feeder for the upper mould cavity 6.
  • the article in this case a light-alloy wheel for a vehicle, is placed in the mould string such that the axis of symmetry of the wheel is substantially vertical.
  • the runner 9 meets the mould cavity 6 at the centre of the wheel and thus at the place where the wall thickness of the wheel is highest.
  • the orifice between the mould cavity 6 and the runner 9 is as large as possible.
  • the massive central part of the wheel can thus be cast relatively quickly without causing too high flow velocities, i.e. without creating turbulent flow. From the central part of the wheel, the molten metal flows through the spokes which are obscured in Figure 2 by the parts of the cores 13, 14 filling the space between the spokes to the rim of the wheel.
  • the rim of the wheel is relatively thin-walled and extends over a relatively long distance, so that it is advantageous that the rim is filled through many channels formed by the spokes.
  • the rim can thus be filled relatively quickly because there are many inlets to the part of the mould cavity that forms the rim.
  • the rim can be better seen in Fig. 4 which shows the cast wheels together with the runner 9 and the feeders without the mould 5 and the cores 13, 14.
  • the central hub of the light-alloy wheel is the most massive part of the article and consequently, it has the highest need for after feeding in order to compensate for shrinkage during solidification of the molten metal.
  • Fig. 5 shows an exploded view of the stack of cores 13, 14.
  • a core 13 is used to define the side surface of the wheel that will be visible when the wheel is used on an automotive vehicle.
  • the core 13 of the upper mould cavity 6 rests on the core 14 forming the other side surface of the wheel, i.e. the side facing towards the vehicle.
  • This second core 14 rests directly on the core 13 of the mould cavity 6 below.
  • This core 13 which forms the visible side surface of the lower wheel rests again directly on the core 14 of the lower mould cavity 6 which forms the inner not visible side surface of the lower wheel.
  • the visible side surface of the wheel is thus formed by the core 13.
  • the cores are usually made of a finer sand-quality. Consequently, the surface quality of the wheel is highest at the place where it is required.
  • more than one stack of cores and cavities is formed between two mould parts 5. It is also possible to have more than two casting cavities 6 in one stack. This is both possible with only one stack formed between two mould parts 5 and with the embodiment with more than one stack of moulding cavities formed between two mould parts 5.
  • the production may be changed very quickly by setting new cores 13, 14 in the moulding cavities which have the shape according to the new design.
  • the mould parts 5 do not need to be changed if only the design of the wheel is changed.
  • the mould parts 5 only have to be changed if the size, i.e. width or diameter, of the wheel has to be changed. Therefore, with one single type of mould parts and a variety of cores, a corresponding variety of designs of wheels can be produced.

Landscapes

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

Abstract

L'invention concerne un procédé de coulage d'articles selon un axe de symétrie, dans les moules au sable séparés (5) d'une installation à moules multiples, et une chaîne de moulage (12) à moules au sable espacés verticalement (5) d'une installation à moules multiples, pour le coulage d'articles selon un axe de symétrie (15). Aux fins de l'invention, l'axe de symétrie des articles à couler est sensiblement vertical. En plaçant ainsi l'axe de symétrie (15), il est possible de laisser le canal (9) rencontrer la cavité du moule (6) en son centre, moyennant quoi on peut obtenir un orifice plus important entre le canal et la cavité du moule (6).
PCT/DK1999/000308 1999-06-09 1999-06-09 Procede de coulee et moules multiples WO2000076696A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/DK1999/000308 WO2000076696A1 (fr) 1999-06-09 1999-06-09 Procede de coulee et moules multiples
AU42568/99A AU4256899A (en) 1999-06-09 1999-06-09 Casting method and mould string

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DK1999/000308 WO2000076696A1 (fr) 1999-06-09 1999-06-09 Procede de coulee et moules multiples

Publications (1)

Publication Number Publication Date
WO2000076696A1 true WO2000076696A1 (fr) 2000-12-21

Family

ID=8157036

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1999/000308 WO2000076696A1 (fr) 1999-06-09 1999-06-09 Procede de coulee et moules multiples

Country Status (2)

Country Link
AU (1) AU4256899A (fr)
WO (1) WO2000076696A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007121875A1 (fr) * 2006-04-18 2007-11-01 Audi Ag Bloc de moulage pour le coulage en sÉrie de pièces

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2912728A (en) * 1956-02-14 1959-11-17 Griffin Wheel Co Casting method and apparatus
GB848604A (en) * 1957-08-30 1960-09-21 Vagn Aage Jeppesen Improvements in and relating to apparatus for producing casting moulds
US4442882A (en) * 1980-09-06 1984-04-17 Michael Achinger Machine for producing flaskless molds
US5207112A (en) * 1992-02-28 1993-05-04 Cummins Engine Company, Inc. Ductile iron gear and casting process for the production thereof
EP0710515A1 (fr) * 1994-11-07 1996-05-08 Reynolds Wheels International Ltd. Procédé thixotropique pour la fabrication de roues en alliage à l'état de mélange liquide-solide

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2912728A (en) * 1956-02-14 1959-11-17 Griffin Wheel Co Casting method and apparatus
GB848604A (en) * 1957-08-30 1960-09-21 Vagn Aage Jeppesen Improvements in and relating to apparatus for producing casting moulds
US4442882A (en) * 1980-09-06 1984-04-17 Michael Achinger Machine for producing flaskless molds
US5207112A (en) * 1992-02-28 1993-05-04 Cummins Engine Company, Inc. Ductile iron gear and casting process for the production thereof
EP0710515A1 (fr) * 1994-11-07 1996-05-08 Reynolds Wheels International Ltd. Procédé thixotropique pour la fabrication de roues en alliage à l'état de mélange liquide-solide

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007121875A1 (fr) * 2006-04-18 2007-11-01 Audi Ag Bloc de moulage pour le coulage en sÉrie de pièces

Also Published As

Publication number Publication date
AU4256899A (en) 2001-01-02

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