EP0195211B1 - Vorrichtung zum Filtern von metallischen Schmelzen - Google Patents

Vorrichtung zum Filtern von metallischen Schmelzen Download PDF

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Publication number
EP0195211B1
EP0195211B1 EP19860101404 EP86101404A EP0195211B1 EP 0195211 B1 EP0195211 B1 EP 0195211B1 EP 19860101404 EP19860101404 EP 19860101404 EP 86101404 A EP86101404 A EP 86101404A EP 0195211 B1 EP0195211 B1 EP 0195211B1
Authority
EP
European Patent Office
Prior art keywords
plate
section
cross
flow
bores
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
EP19860101404
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0195211A2 (de
EP0195211A3 (en
Inventor
Heinz-Ulrich Prof.Dr.-Ing. Doliwa
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.)
E Hofmann & Soehne oHG
Original Assignee
E Hofmann & Sohne oHG
E Hofmann & Sohne oHG
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 E Hofmann & Sohne oHG, E Hofmann & Sohne oHG filed Critical E Hofmann & Sohne oHG
Publication of EP0195211A2 publication Critical patent/EP0195211A2/de
Publication of EP0195211A3 publication Critical patent/EP0195211A3/de
Application granted granted Critical
Publication of EP0195211B1 publication Critical patent/EP0195211B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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

Definitions

  • the invention relates to a device for filtering metallic melts, consisting of a body formed, for example, from ceramic with a multiplicity of parallel bores.
  • Filters were preferably installed in the runner system of the pouring channel in order to effectively detect even the smallest of impurities.
  • Filter bodies having an open-pore foam structure have become known, the porosity of which moves within a range suitable for these casting purposes.
  • such filters have a highly irregular design of the passage channels and cell walls, which affects the flow direction of the melt and its flow rate, on the other hand the flow conditions overall unpredictably, so that the expected flow losses and the extension of the casting time could no longer be determined.
  • compliance with a specific casting time is absolutely necessary, for example in the production of thin-walled castings, in order to prevent incorrect castings due to non-leakage or cold welding.
  • Another type of filter are mesh-like fabrics made of highly refractory fibers, the flow cross-section of which can be defined with sufficient precision, but whose filtering action is mainly limited to the separation of induction with solid particles.
  • filters regardless of their possible hardening with synthetic resins or the like, such filters cause considerable installation difficulties.
  • Ceramic filter plates with a large number of round bores with a small cross section can be determined with sufficient accuracy with regard to their passage cross section. However, they have the defect that they do not deflect the flow of the melt. From a certain plate thickness, their flow resistance increases, which in turn is the reason for a corresponding increase in the casting time. All previously known types of filters have a comparatively large dimension for the running or pouring section. This leads to an increasing proportion of the circulation and to an undesired deterioration in the casting output. The filter effects of these previously known devices assume that the melt is stowed in front of the filter and then has to flow through more or less narrow channels or bores in order to collect the contaminants adhering to the melt on the walls of the bores or channels.
  • filter elements for filtering molten metals are known (DE-A-33 40 417), which consist of a filter fabric arranged on a support provided with through openings.
  • the carrier is formed from a ceramic mass. This is to create a filter element that can be easily inserted into the desired position in the casting or in the casting mold and that ensures optimal filtration of the molten metal with sufficient mechanical stability. This does not, however, result in a deflection of the melt.
  • Such metal melts are basically practically incompressible liquids, the product of which is assumed to be constant from the cross-section and flow velocity.
  • the product determines the casting volume per unit of time, the so-called casting performance, the time required for mold filling, which is largely dependent on the material used in each case. If a certain casting performance is to be maintained over the entire mold filling time without a part of the melt overflowing at the gate, the flow velocity in the narrow flow cross section of the filter will increase sharply, as a rule by more than twice the flow velocity in front of the filter . This increase in the flow velocity counteracts the separation of very finely distributed impurities contained in the melt, and even particles that can be separated are carried away in part by the rapid flow.
  • the invention is based on these considerations in an effort to create a filter which is as simple and uncomplicated in construction as is improved in its mode of operation.
  • this object is achieved in a device of the type mentioned in the introduction in that an inlet-side plate and an outlet-side plate are arranged one behind the other in the direction of flow of the melt and at a distance, the bores being in the upper region of the inlet-side plate and in the lower region of the outlet-side plate and that between This plate is provided with a chamber soothing the flow, in which the flow of the melt is deflected from top to bottom.
  • the invention is based on the basic idea that the separation of impurities from a metallic melt requires a certain time factor, which is why the flow of the melt in the area of the filter device is calmed down by reducing the flow velocity. By displacing the boreholes on the inlet and outlet side, the flow is also deflected, which significantly favors the separation processes.
  • the invention addresses the fact that the products to be separated are generally subject to a buoyant force and can easily rise in the flow under certain conditions.
  • the arrangement of the bores on both sides according to the invention makes additional measures for deflecting the flow direction unnecessary. By deflecting the flow downward, the contamination particles in the melt rise upwards.
  • At least one plate has edge strips angled to the plate plane, which serve as spacers with respect to the other plate. This eliminates the need for additional components that would otherwise be required to form the calming chamber between the two plates.
  • Another alternative is provided by the invention in such a way that both plates have edge strips angled to the plate plane, which abut one another in the installed position. The plates then have approximately the same basic shape, and they differ primarily in the staggered arrangement of the holes and the different number of holes.
  • the bores can have a round cross section for manufacturing reasons of the filter plates. However, efforts are being made to keep the individual flow threads free of twist, which is particularly important for sensitive casting materials. In order to rule out a possible twist with certainty, the holes can have a triangular or polygonal cross section.
  • the cross section of the settling chamber corresponds approximately to the flow cross section of the pouring channel in front of the filter.
  • the flow in the settling chamber is thus slowed down to a value after passing through the inlet-side filter plate as it prevails before it enters the filter.
  • the flow cross section of the calming chamber is preferably at least twice as large as the flow cross section of the inlet-side plate.
  • the two plates 1 and 2 have an identical profile of approximately trapezoidal shape. Their outer contour thus corresponds to the runs of the pouring channel, which are usually carried out with a trapezoidal cross section.
  • the plates 1 and 2 can, however, be given any other shape.
  • the filter plate 1 is assigned to the inlet side in a pouring channel. Its upstream side is labeled 3. On two opposite sides it has an edge strip 4, which is angled to the plane of the plate 1.
  • the general shape of the outlet-side plate 2 corresponds entirely to the design of the plate 1. In this plate 2, the downstream side is designated by 5.
  • the plate 1 assigned to the inlet side has four rows of bores 6 having a cylindrical cross section in the embodiment shown.
  • the holes 6 of the individual rows are arranged one above the other in a gap.
  • the bores are located approximately in the upper half of the plate 1.
  • the bores 6 of the plate 2 likewise have a cylindrical cross section, and in the embodiment shown they are arranged in three rows one above the other, each with a gap, in the region of the lower half the plate, i.e. adjacent to the trapezoidal base.
  • the assembly of the two plates 1 and 2 results from FIG. 5, the surfaces 3 and 5 each facing outwards and the edge strips 4 lying flat against one another.
  • the melt enters through the holes arranged in the head of the plate 1 an inner calming space 8, and it leaves this space 8 through the bores 6 of the plate 2 arranged in the lower plate part.
  • the flow direction is deflected approximately at right angles both when entering and leaving the calming space 8.
  • the contaminants of the melt float and are deposited above the melt within the calming space 8.
  • FIGS. 7 u. 8 The embodiment of FIGS. 7 u. 8 is characterized in that the bores 6 have a triangular cross section, which prevents a twist of the thread of the melt flowing through the bores 6.
  • the attachment of the two plates 1 u. 2 in the pouring channel takes place in the usual and therefore not shown in detail in a recess in the wall into which the circumference of the plates 1 u. 2 engages.
  • the plates 1 u. 2 are preferably made of a ceramic material, which ensures good shape and high durability.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Filtering Materials (AREA)
EP19860101404 1985-03-14 1986-02-04 Vorrichtung zum Filtern von metallischen Schmelzen Expired - Lifetime EP0195211B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3509113 1985-03-14
DE19853509113 DE3509113A1 (de) 1985-03-14 1985-03-14 Vorrichtung zum filtern von metallischen schmelzen

Publications (3)

Publication Number Publication Date
EP0195211A2 EP0195211A2 (de) 1986-09-24
EP0195211A3 EP0195211A3 (en) 1987-05-27
EP0195211B1 true EP0195211B1 (de) 1990-05-23

Family

ID=6265165

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860101404 Expired - Lifetime EP0195211B1 (de) 1985-03-14 1986-02-04 Vorrichtung zum Filtern von metallischen Schmelzen

Country Status (2)

Country Link
EP (1) EP0195211B1 (enrdf_load_stackoverflow)
DE (1) DE3509113A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104439085A (zh) * 2014-11-25 2015-03-25 柳州金特机械有限公司 一种铸造用浇口杯

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2097261C (en) * 1992-05-29 2001-07-24 Jean-Charles Daussan Process for treating molten metal during casting operation using a filter and filter for implementing the process
US5961918A (en) * 1996-05-20 1999-10-05 Corning Incorporated Triangular cell metal filters
CN106041041A (zh) * 2016-08-12 2016-10-26 辽宁欣立耐火材料科技集团有限公司 连铸中间包用钢水净化器
CN110303142B (zh) * 2019-08-13 2021-08-27 巢湖宜安云海科技有限公司 一种镁合金铸造浇口装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1296741B (de) * 1964-04-29 1969-06-04 Pichler Geb Plath Ilse Eingusskern
US3524548A (en) * 1968-09-16 1970-08-18 Kaiser Aluminium Chem Corp Filter medium for molten metal
US3981352A (en) * 1975-11-21 1976-09-21 Howmet Corporation Metal casting mold with bonded particle filter
DE8422616U1 (de) * 1984-07-30 1984-11-15 Schäfer, Jürgen M., Dipl.-Ing., 5064 Rösrath Filter fuer eisenwerkstoffe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104439085A (zh) * 2014-11-25 2015-03-25 柳州金特机械有限公司 一种铸造用浇口杯

Also Published As

Publication number Publication date
DE3509113A1 (de) 1986-09-18
DE3509113C2 (enrdf_load_stackoverflow) 1991-11-14
EP0195211A2 (de) 1986-09-24
EP0195211A3 (en) 1987-05-27

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