EP0276453A1 - Dispositif pour la coulée de métaux liquides - Google Patents

Dispositif pour la coulée de métaux liquides Download PDF

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Publication number
EP0276453A1
EP0276453A1 EP87118785A EP87118785A EP0276453A1 EP 0276453 A1 EP0276453 A1 EP 0276453A1 EP 87118785 A EP87118785 A EP 87118785A EP 87118785 A EP87118785 A EP 87118785A EP 0276453 A1 EP0276453 A1 EP 0276453A1
Authority
EP
European Patent Office
Prior art keywords
filter body
filter
frame
pouring channel
melt
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Withdrawn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
EP87118785A
Other languages
German (de)
English (en)
Inventor
Hans E. Winkler
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.)
Stettner and Co
Original Assignee
Stettner and Co
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 Stettner and Co filed Critical Stettner and Co
Publication of EP0276453A1 publication Critical patent/EP0276453A1/fr
Withdrawn legal-status Critical Current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
    • B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
    • B22D43/001—Retaining slag during pouring molten metal
    • B22D43/004—Retaining slag during pouring molten metal by using filtering means
    • 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
    • B22C9/086—Filters

Definitions

  • the invention relates to a device for casting metallic melts with a filter in the pouring channel.
  • Such filter bodies generally consist of ceramic material. They are built into the flow path of the melt in order to separate contaminants carried along by it. These come from slag residues, reaction products from metallurgical treatments of the melt, non-metallic oxides, rinsing off from the molding material, residues from vessels that come into contact with the melt, and inoculation processes.
  • the level of impurities determines the reject rate and thus crucially the manufacturing costs of the castings.
  • This problem is of particular importance in mechanized molding plants, in which, for reasons of cost, the format of the molding box is changed more and more in order to reduce the investment costs of the casting plant.
  • the aim is to use the base of the molding box with as many castings as possible.
  • filters have preferably been installed in the runner system of the pouring channel in order to effectively detect even the smallest size of impurities.
  • An open-pore foam structure has become known, the porosity of which moves within a range suitable for these casting purposes.
  • filters have a highly irregular design of the passage channels and cell walls, which changes the flow direction of the melt and its flow velocity within the filter, but on the other hand influences the flow conditions in an unpredictable manner, so that the expected flow losses and the extension of the casting time can no longer be determined were. Maintaining a certain casting time is of particular importance, for example, in the manufacture of thin-walled castings in order to prevent incorrect castings due to non-leakage or cold welding.
  • a previously known device (DE-OS 35 09 113) assumes that two plates are arranged one behind the other in the direction of flow and at a distance, the through bores of which are offset from one another and between which a chamber calming the flow is provided see is.
  • mechanized pouring devices require further measures in the context of the desired goal of optimal cleaning of the melt flow.
  • this object is achieved in a device of the type described in the introduction in that the filter body is arranged in a deviating manner from the general flow direction of the melt in the pouring channel at the foot of a baffle. The flowing melt hits this baffle and is thereby forcibly deflected.
  • the melt is thus jammed and its flow speed is slowed down.
  • the generally specifically lighter non-metallic impurities can thereby separate out due to the density selection which becomes effective and are essentially kept away from the filter surface.
  • the filter body itself collects finer particles still remaining in the largely cleaned flow of the melt or entrained by it.
  • the filter body is arranged between the head of a first and the foot of a second baffle wall, which follows at a distance in the flow direction. It follows that the flow is deflected and blocked in front of the filter body. The same process is repeated after the filter body, so that the selection acting on the melt stream is doubled.
  • the chair-like frame has a contour corresponding to the pouring channel cross section.
  • Such a frame accommodating the filter body then fills the entire cross-section of the pouring channel, so that incorrect flows are avoided.
  • the invention provides that an inoculation device is arranged in the pouring channel in front of the filter.
  • the assignment of the inoculation device, for example the inoculation core, and the downstream filter according to the invention has proven to be particularly effective in order to keep the reaction products which inevitably occur during the reaction with the inoculant out of the casting. This idea is of particular importance in the manufacture of high quality nodular cast iron, which generally requires re-seeding.
  • the measure according to the invention can be considered for all metal melts.
  • the filter consists of a chair-like frame 2 with two side cheeks 3 and the front wall 4 and rear wall 5 connecting them.
  • This frame 2 accommodates the actual filter body 6. It rests on the front wall 4 and lies against the rear wall 5 with its rear end. As is known per se, it has a multiplicity of regularly arranged parallel through bores 7.
  • the surface 8 of the filter body 6 is located approximately halfway up the frame 2 in the embodiment shown.
  • the filter body 6 as well as the frame 2 are expediently made of ceramic material, but are generally made separately from one another, and the filter body 6 is then placed in the frame 2, e.g. with the help of a refractory putty or the like, attached.
  • FIGS. 2 and 3 show an installation example of this filter 1 in a pouring channel 10, which is delimited at the top by the top box 11 or a corresponding cover core and carries the pouring box 12 with the pouring openings 13.
  • the cross section of the pouring channel 10 corresponds, as shown, to the contour of the filter 1, so that the entire flow cross section of the pouring channel 10 is filled.
  • the filter body 6 is arranged within the pouring channel 10 such that its upper one flow surface 8 is parallel to the general flow direction of the melt in the pouring channel 10, which here is equated to the course of the pouring channel.
  • the melt flow inside the pouring channel 10 first undergoes a deflection upwards of 90 ° with respect to the general flow direction and meets the ceiling 14 of the pouring channel 10 there, so that it is again at about 90 ° in the direction of the rear wall 5 of the frame 2 is redirected.
  • the front wall 4 and the rear wall 5 of the frame 2 thus act as baffles for the melt flow.
  • the melt enters the filter body 6 in the inflow plane 8.
  • the impact of the front wall 4 and rear wall 5 cause a selective separation of the impurities contained in the melt stream. These then reach the surface of the stream without reaching the filter body 6.
  • Its opening cross-section, mesh size and thickness 15 are determined by the type of cast metal to be processed, the casting temperature and the required casting speed. They can be varied within wide limits. Due to the separate, independent of the frame 2 production of the filter body 6, one and the same frame 2 can be used for filter bodies 6 of various designs. Residual impurities are excreted in the filter body 6.
  • FIGS. 2 and 3 shows a symmetrical arrangement of two filters 1 in a pouring channel 10, in which an inoculation core 16 is arranged below the inflow openings 13 from the pouring box 12, as is the case, for example, in the production of high-quality spheroidal graphite cast iron for inoculation the melt is used.
  • the flow pattern is shown schematically in the pouring channel 10.
  • the design of the pouring device according to the invention allows the filter to be dimensioned in accordance with the respective requirements, so that a flow rate which is independent of the pouring channel cross section, and possibly also significantly larger, can be achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
EP87118785A 1987-01-03 1987-12-18 Dispositif pour la coulée de métaux liquides Withdrawn EP0276453A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3700107 1987-01-03
DE19873700107 DE3700107A1 (de) 1987-01-03 1987-01-03 Vorrichtung zum giessen von metallischen schmelzen

Publications (1)

Publication Number Publication Date
EP0276453A1 true EP0276453A1 (fr) 1988-08-03

Family

ID=6318430

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87118785A Withdrawn EP0276453A1 (fr) 1987-01-03 1987-12-18 Dispositif pour la coulée de métaux liquides

Country Status (2)

Country Link
EP (1) EP0276453A1 (fr)
DE (1) DE3700107A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1067441C (zh) * 1998-02-11 2001-06-20 多森公司 过滤和处理熔融金属用的装置
EP2140956A1 (fr) 2008-07-04 2010-01-06 hofmann CERAMIC GmbH Dispositif de coulée pour fontes métalliques

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4012093C1 (fr) * 1990-04-14 1991-07-04 Didier-Werke Ag, 6200 Wiesbaden, De
DE10041717C2 (de) * 2000-08-25 2002-10-31 Deutsch Zentr Luft & Raumfahrt Trägerkörper
DE102022000338A1 (de) 2022-01-28 2022-03-24 Daimler Ag Vorrichtung zum Gießen einer metallischen Schmelze

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR338645A (fr) * 1903-11-13 1904-05-30 Nicolaus Mennickheim Procédé de moulage
FR2219231A2 (fr) * 1973-02-27 1974-09-20 Stettner & Co
DE3340417A1 (de) * 1983-11-09 1985-05-15 Gebrüder Lüngen GmbH & Co KG, 4006 Erkrath Filterelement zum filtrieren von metallschmelzen
DE8614662U1 (de) * 1986-05-30 1986-10-23 Steuler Industriewerke GmbH, 5410 Höhr-Grenzhausen Tragtrog für auswechselbare Hochtemperatur-Metallschmelzenfilter

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4052198A (en) * 1976-02-02 1977-10-04 Swiss Aluminium Limited Method for in-line degassing and filtration of molten metal
CA1130980A (fr) * 1977-11-25 1982-09-07 Swiss Aluminium Ltd. Methode de filtration de metaux en fusion

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR338645A (fr) * 1903-11-13 1904-05-30 Nicolaus Mennickheim Procédé de moulage
FR2219231A2 (fr) * 1973-02-27 1974-09-20 Stettner & Co
DE3340417A1 (de) * 1983-11-09 1985-05-15 Gebrüder Lüngen GmbH & Co KG, 4006 Erkrath Filterelement zum filtrieren von metallschmelzen
DE8614662U1 (de) * 1986-05-30 1986-10-23 Steuler Industriewerke GmbH, 5410 Höhr-Grenzhausen Tragtrog für auswechselbare Hochtemperatur-Metallschmelzenfilter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1067441C (zh) * 1998-02-11 2001-06-20 多森公司 过滤和处理熔融金属用的装置
EP2140956A1 (fr) 2008-07-04 2010-01-06 hofmann CERAMIC GmbH Dispositif de coulée pour fontes métalliques

Also Published As

Publication number Publication date
DE3700107A1 (de) 1988-07-14
DE3700107C2 (fr) 1989-06-08

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