EP1052041A2 - Moule avec masselotte sous pression - Google Patents

Moule avec masselotte sous pression Download PDF

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Publication number
EP1052041A2
EP1052041A2 EP00109888A EP00109888A EP1052041A2 EP 1052041 A2 EP1052041 A2 EP 1052041A2 EP 00109888 A EP00109888 A EP 00109888A EP 00109888 A EP00109888 A EP 00109888A EP 1052041 A2 EP1052041 A2 EP 1052041A2
Authority
EP
European Patent Office
Prior art keywords
sealing element
casting mold
mold according
pantry
compressed gas
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Withdrawn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
EP00109888A
Other languages
German (de)
English (en)
Other versions
EP1052041A3 (fr
Inventor
Dirk Barkschett
Klaus Dr. Lellig
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.)
VAW Alucast GmbH
Disa Industries AS
Original Assignee
VAW Alucast GmbH
Disa Industries AS
Georg Fischer Disa 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 VAW Alucast GmbH, Disa Industries AS, Georg Fischer Disa AS filed Critical VAW Alucast GmbH
Publication of EP1052041A2 publication Critical patent/EP1052041A2/fr
Publication of EP1052041A3 publication Critical patent/EP1052041A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates

Definitions

  • the invention relates to a casting mold with a surrounding for molding provided with pressurized gas pantry.
  • the cast material poured into a mold is subject to during the Cooling and solidification of a volume reduction.
  • Casting material must therefore be refilled in the cooling and solidification phase.
  • a reservoir for casting material to be refilled one or more are used when pouring the casting material provided next to the mold cavity to be filled pantry opposite the mold cavity are so insulated that the casting material in them only then completely solidified when all the casting material is already in the mold cavity or one of the Part of the mold cavity associated with the pantry is solidified.
  • the gravity of the casting material can be used.
  • WO 95/18689 it is also known to pressurize feeder chambers to cast material during the cooling and solidification phase from the pantry into the mold cavity to press. The compressed gas can be supplied to the pantry via a line or in the chamber itself.
  • the present invention has for its object a new mold of the beginning to create mentioned type, which the production of castings with compared to State of the art enables increased quality and manufacturing reliability.
  • the casting mold according to the invention solving this problem is characterized in that at least one wall part of the pantry coming into contact with the compressed gas is sealed against the escape of compressed gas in the molding sand.
  • the pantry is more connected in nature Vessels connected to the mold cavity of the casting mold and the pantry sealing element which delimits a hat-like configuration.
  • the pantry Compressed gas supplied or generated in the pantry then takes up within the pantry a limited only by the cast material level and the sealing element Volume from where compressed gas cannot escape into the molding sand.
  • the depth the sealing element ultimately depends on how far the casting material level in the pantry with complete compensation of the shrinkage must decrease, the depth of the Sealing element may be less than this level difference, because during the Cooling process below the sealing element already on the inner wall of the pantry forms a sealing covering from solidified cast material.
  • the sealing element can be a molded part which can preferably be produced by deep drawing from a metal foil, e.g. act an aluminum foil, the foil for reasons of Material savings should be as thin as possible.
  • the molding should be at least one Have stability that it automatically with the help of inserting mold cores using devices (core setters) can be placed in the mold.
  • the sealing element therefore has suitable beads on, through which a high degree of stability can be achieved with a small amount of material.
  • the sealing element it would be conceivable for the sealing element to be particularly stable as a reusable part to train.
  • the hat-like sealing element is included connected to a part projecting into the molding sand for anchoring in the molding sand, that in the hat-like sealing element preferably by a circumferential collar on Opening edge is formed, which is particularly in the case of a conical design of the hat-like Sealing element prevents the sealing element from becoming detached from the wall.
  • the feed chamber is pressurized one that can be inserted into the mold under penetration to the pantry Pressure line provided.
  • This pressure line is preferably included as a pressure line lance a cutting edge or tapered end and preferably lateral compressed gas outlet openings educated. With such a lance, the mold and in particular lightly pierce the sealing element, the sealing element advantageously one of these Grooving can have an even weaker vulnerability.
  • Fig. 1 is generally a sand mold with a mold cavity 2 and a mold core 3 arranged in the mold cavity 2.
  • the mold cavity 2 is connected to a ventilation duct 4.
  • Reference numeral 5 denotes a feed chamber forming a reservoir for cast material, which communicates with the mold cavity 2 at 6.
  • a filling channel 7 opens into the feeder chamber 5, via which the feeder chamber 5 and the mold cavity 2 can be filled with casting material from below using pressure.
  • sealing element 8 is a cup-shaped, conical in the embodiment shown Designated sealing element, which an upper part of the surrounding by molding sand Seal chamber 5 seals.
  • the sealing element described in more detail with reference to FIG. 2 consists of an aluminum foil in the embodiment shown and is in the deep-drawing process manufactured.
  • a pipe lance 9 is pierced into the mold, the tip of which is the sealing element 8 has penetrated and has penetrated into the pantry 5.
  • the pipe lance 9 has a cutting edge 10 at its tip, for their manufacture by axial end incisions formed tube wall legs with formation side openings 11 have been compressed.
  • FIG. 2 where with the reference numeral 12 a weak point in the bottom wall of the cup-shaped sealing element 8, which indicates the penetration the pipe lance 9 in the pantry 5 facilitated.
  • the sealing element points at its opening edge a circumferential collar 14.
  • the sealing element can also include air holes, e.g. in Perforated shape.
  • the pantry 5 and the mold cavity 2 is filled via the filling line 7 with casting material, the casting material is each supplied under a pressure that is equal to the material already filled in generated gravity at least compensates. If necessary, existing ventilation holes in the sealing element become clogged by the melt.
  • the pipe lance 9 is connected to a pressure source via which of the pantry 5 exiting from the side openings 11 into the pantry Compressed air is supplied.
  • the air pressure is at least equal to the gravity pressure of the still liquid casting material at the boundary formed in the pantry 5 between Compressed air and casting material.
  • connection 6 which has a relatively large flow cross-section
  • Cast material supplied from the pantry, being secured by air pressure is that this shrinkage compensation also affects that above the pantry located volume of the mold cavity extends. With sinking casting material level in the feed chamber 5 increases the pressure required for this.
  • the sealing element 8 ensures that that which is required in each case in the feeder chamber 5 Pressure is maintained and there is no pressure drop due to escape of compressed air in the surrounding, not gas-tight molding sand.
  • the sealing element 8 is so stable in the rest that it with the help of the insertion of cores Usually used devices can be used in the mold.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
EP00109888A 1999-05-11 2000-05-10 Moule avec masselotte sous pression Withdrawn EP1052041A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19922534 1999-05-11
DE1999122534 DE19922534A1 (de) 1999-05-11 1999-05-11 Gießform mit druckbeaufschlagbarer Speiserkammer

Publications (2)

Publication Number Publication Date
EP1052041A2 true EP1052041A2 (fr) 2000-11-15
EP1052041A3 EP1052041A3 (fr) 2003-12-17

Family

ID=7908252

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00109888A Withdrawn EP1052041A3 (fr) 1999-05-11 2000-05-10 Moule avec masselotte sous pression

Country Status (2)

Country Link
EP (1) EP1052041A3 (fr)
DE (1) DE19922534A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7601431B2 (en) 2005-11-21 2009-10-13 General Electric Company Process for coating articles and articles made therefrom

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2568428A (en) * 1949-09-09 1951-09-18 Irvin A Billiar Mold with riser and exothermic insert
US3513904A (en) * 1967-10-26 1970-05-26 Wyman Curtis Lane Self-pressurizing feeder head device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7601431B2 (en) 2005-11-21 2009-10-13 General Electric Company Process for coating articles and articles made therefrom

Also Published As

Publication number Publication date
DE19922534A1 (de) 2000-11-16
EP1052041A3 (fr) 2003-12-17

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