EP1864729A2 - Masselotte métallique - Google Patents

Masselotte métallique Download PDF

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Publication number
EP1864729A2
EP1864729A2 EP07011292A EP07011292A EP1864729A2 EP 1864729 A2 EP1864729 A2 EP 1864729A2 EP 07011292 A EP07011292 A EP 07011292A EP 07011292 A EP07011292 A EP 07011292A EP 1864729 A2 EP1864729 A2 EP 1864729A2
Authority
EP
European Patent Office
Prior art keywords
wall
feeder
feeder according
cavity
coating
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Withdrawn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
EP07011292A
Other languages
German (de)
English (en)
Other versions
EP1864729A3 (fr
Inventor
Rolf Rietzscher
Gotthard Wolf
Jürgen Schäfer
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.)
GTP Schaefer Giesstechnishe Produkte GmbH
Original Assignee
GTP Schaefer Giesstechnishe Produkte GmbH
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 GTP Schaefer Giesstechnishe Produkte GmbH filed Critical GTP Schaefer Giesstechnishe Produkte GmbH
Publication of EP1864729A2 publication Critical patent/EP1864729A2/fr
Publication of EP1864729A3 publication Critical patent/EP1864729A3/fr
Withdrawn legal-status Critical Current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
    • B22C9/088—Feeder heads

Definitions

  • the invention relates to a feeder for insertion into a mold used in the casting of metals with a feeder body enclosing a feeder body consisting of a circumferential side wall, a lid portion and a feeder opening as a connection to the mold cavity having bottom portion, wherein the feeder body at least in the region of its side wall double-walled is formed with an intermediate space between an inner wall and an outer wall.
  • Such a feeder is from the DE 23 34 501 A1 known.
  • the feeder consists of two cups, which are arranged inside one another and formed from a thin-walled plastic, between which a refractory insulating material which is preferably free of binders is introduced.
  • a diatomaceous earth is proposed.
  • the known feeder is the disadvantage associated with the fact that the plastic burns in its contact with the entering into the feeder volume molten metal, wherein the resulting gases can contribute to undesirable emissions.
  • exothermic feeders contain organic compounds which decompose during pyrolysis due to the heat of casting and contribute to undesirable emissions.
  • the gases released during the pyrolysis can lead to uncontrolled and undesired explosions within the casting mold via the resulting gas mixtures, which result in damage to the casting surface.
  • the residual materials of the original feeder material present after pyrolysis enter the molding material cycle and adversely affect the molding material properties for the production of further casting molds.
  • the invention is therefore based on the object to provide a feeder insert of the type mentioned above, the good Insulation effect avoids the aforementioned disadvantages and behaves as far as possible in relation to the molten metal as well as the molding material neutral.
  • the invention provides in its basic idea that the feeder body with inner wall and outer wall consists of a dimensionally stable metal body.
  • the invention has the advantage that the existing metal feed insert during the action of the hot molten metal during the casting process releases no pollutants, but after the solidification of the. Residual melt in the feeder volume is connected to the so-called feeder remainder and can be removed together with this from the finished casting and the circulation material and thus a recycling can be supplied. It is sufficient in terms of constructive design of the feeder body, if the feeder body is formed at least in the region of its side wall double-walled with the cavity. However, it can also be provided that the cavity extends beyond the side wall into the lid area, wherein the cavity can also extend circumferentially over the side walls and the lid area.
  • the space left between the inner wall and the outer wall as a one. Insulating gap forming, sealed against the ambient atmosphere cavity is formed. Due to the double-walled design of the feeder body with the cavity arranged therein, an insulating body is present, which can hold the molten metal correspondingly long for feeding purposes by appropriate choice of the wall thickness of the inner wall or outer wall as well as the metal alloy used for the production of the feeder body, without the Inside wall and the Outer wall to get in contact with softening with the result that the insulation effect would collapse.
  • an inert gas which expands when exposed to heat, can be achieved by an appropriately adjusted determination of the wall thickness of the inner wall of the feeder body that the inner wall bulges into the feeder volume, so that an active supply of the mold can be achieved.
  • the outer wall of the feeder body is provided with a predetermined breaking point for producing an opening connecting the cavity of the feeder body with the ambient atmosphere.
  • the cavity is evacuated.
  • the inner sides of the cavity enclosing surfaces of the inner wall and outer wall of the feeder body have a heat radiation reflecting properties: For this it may be sufficient if the facing metal surfaces of the inner wall and outer wall are polished.
  • the mutually facing surfaces of the inner wall and outer wall are provided with a heat radiation reflective coating, according to embodiments of the invention may consist of zinc or tin or a suitable alloy.
  • Inner space and outer wall left gap is filled with a highly insulating material, which may be provided that the gap is filled with silicate balls, glass wool or ceramic particles.
  • the coating further forms a diffusion barrier for carbon contained in the molten metal.
  • the coating is available as a suitable material for a meeting the above requirements coating tin.
  • a layer of an exothermic material for example of magnesium, is arranged on the surface of the inner wall enclosing the feeder volume, so that the inner wall of the feeder body is heated when the hot molten metal impinges and skin formation is prevented.
  • the feeder has a shape tapering towards the mold cavity for forming a breaker core and the walls surrounding the connection opening of the feeder to the mold cavity are designed to be insulating.
  • the connection opening of the feeder to the mold cavity is formed with a minimum possible, proper feeding still permitting cross-section, the environment of the connection opening is to be isolated accordingly.
  • the inner wall enclosing the cavity and the outer wall are bent over to form the breaker core; This results in the same connection in the area of the connection opening as in the area surrounding the feeder volume.
  • a separate, made of metal and executed with insulating component with the connection opening is attached.
  • a vent is arranged so that the displaced upon entry of the liquid metal in the feeder volume air can escape , Such venting is basically also provided in the cited prior art.
  • the feeder body consists of two cup-shaped feeder parts, which are inserted one inside the other and leave the cavity, as is also known in principle in the prior art.
  • the feeder body With such a design of the feeder body, it is possible to carry out the treatments of the interior according to embodiments of the invention. and perform outer walls of the cup-shaped riser parts in a simple manner.
  • inner wall and outer wall of the feeder body are made of thin sheet, this results in the advantage that feeder inserts in any shape and geometry can be produced in a simple way.
  • the recycling of the feeder body following the casting process can be improved in that according to one embodiment of the invention, the composition of the metal used for the production of the feeder body is alloyed with the metal melt to be introduced into the casting mold.
  • the melting of the metallic and the. Cavity enclosing inner wall to prevent is provided according to an embodiment of the invention that the cavity enclosing the inner wall is provided with an insulation.
  • Such insulation may consist of an insulating coating applied to the inner wall or of a coating of an insulating material applied thereto.
  • the feeder body consists of three each leaving the cavity as well as forming another, inside the inner wall disposed further cavity nestled in one another pot-shaped feeder parts, wherein the additional inner cavity with an insulating material is filled.
  • the inner cavity is insulated and thus protects the outer cavity bounding the inner wall from melting and thus maintains the outer cavity upright.
  • the feeder insert designated by 10 has a feeder body 11 which comprises a side wall 14 surrounding an inner feeder volume 12 and a cover area 13. With its lid region 13 opposite bottom portion 15 in which a feeder opening 20 is formed as a connection between the feeder 12 and the mold cavity, the feeder insert 10 can be placed on a shaped body, not shown, the mold cavity in the manufacture of the mold by introducing a corresponding molding sand formed.
  • the feeder body In the region of its side wall 14, the feeder body 11, preferably formed of metallic thin sheets, consists of an inner wall 16 and an outer wall 17 which leave a cavity 18 therebetween which, by means of a seal 19 formed in the bottom area 15 of the feeder body 11, opposes it Atmosphere is sealed.
  • the thus completed cavity 18 can be improved the insulation effect either evacuated or filled with an inert gas or with air.
  • Inner wall 16 and outer wall 17 of the feeder body 11 may be designed such that they reflect an occurring heat radiation.
  • the corresponding metal surfaces may be polished.
  • it may also be provided a coating, for example, zinc or tin or other suitable alloy.
  • the inner sides of the inner wall 16 of the feeder body 11 which surround the feeder volume 12 have a heat radiation-reflecting properties in that these inner sides of the inner wall 16 are again polished. It is also provided that the inner sides of the inner wall are provided with a heat radiation reflecting coating, which coating simultaneously forms a diffusion barrier for carbon contained in the molten metal, so that this carbon can not diffuse into the inner wall 16 and the inner wall 16 to quickly melts.
  • a coating that meets both requirements can be made of tin.
  • the feeder body 11 consists of two with leaving the cavity 18 nestled in one another cup-shaped feeder parts 25.
  • the outer wall 17 is additionally formed with a predetermined breaking point 24, so that upon expansion of the pending in the cavity 18 air or a introduced gas at a too high, due to heating adjusting overpressure controlled opening of the outer wall 17 takes place.
  • a vent 26 is formed in the lid portion 13 in the form of a corresponding opening so that the displaced upon entry of the liquid metal into the feeder volume 12 during the casting process air can escape through the vent 26.
  • a vent 26 may be inserted in the vent 26, for example, a William core made of an insulating or refractory material.
  • connection opening 28 having refractive core portion 27 to (not shown) mold cavity of a mold tapered shape, wherein the dimension of the connection opening 28 is kept significantly smaller than the dimension the provided in the embodiments of Figures 1 and 2 feeder opening 20 to keep heat losses in this area as low as possible. Since the edges of the connection opening 28 are formed by the end faces of the inner wall 16 and the outer wall 17 including the cavity 18 enclosed therefrom, a good insulation is realized in this area.
  • FIG. 4 shows that for forming a breaker core, a separate component 30 can also be provided, which is positively connected to the lower edge of the feeder body 11 by interposing projections or a peripheral, rising edge 31 in the cavity 18 between the component 30 Inner wall 16 and outer wall 17 of the feeder body 11 engage and simultaneously effect the seal in this area.
  • the component 30 contains the connection opening 28 and may consist of a suitably produced insulating or exothermic or insulating-exothermic material.
  • a William core 32 is further inserted into the vent 26.
  • the intermediate space between the inner wall 16 and the outer wall 17 is not as Leave cavity, but filled with a highly insulating material. Even with such an embodiment prevents in particular the existing metal wall 16 melts, which can be prevented by the described measures of the treatment of the inner wall 16 on the the feed volume 12 enclosing inside the melting of the inner wall 16.
EP07011292A 2006-06-08 2007-06-08 Masselotte métallique Withdrawn EP1864729A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202006009015U DE202006009015U1 (de) 2006-06-08 2006-06-08 Metallischer Speiser

Publications (2)

Publication Number Publication Date
EP1864729A2 true EP1864729A2 (fr) 2007-12-12
EP1864729A3 EP1864729A3 (fr) 2009-04-15

Family

ID=36915328

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07011292A Withdrawn EP1864729A3 (fr) 2006-06-08 2007-06-08 Masselotte métallique

Country Status (2)

Country Link
EP (1) EP1864729A3 (fr)
DE (1) DE202006009015U1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108772537A (zh) * 2018-08-13 2018-11-09 共享装备股份有限公司 一种空气隔层式球冒口
EP3756788A1 (fr) 2019-06-24 2020-12-30 GTP Schäfer Gießtechnische Produkte GmbH Insert d'alimentation doté d'un contour extérieur avant et arrière
EP3756787A1 (fr) 2019-06-24 2020-12-30 GTP Schäfer Gießtechnische Produkte GmbH Insert d'alimentation à gaine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007012117A1 (de) * 2007-03-13 2008-09-18 AS Lüngen GmbH Luftspalt-Speiser
EP3009209A1 (fr) 2014-10-16 2016-04-20 GTP-Schäfer Giesstechnische Produkte GmbH Procede de fabrication d'un alimentateur avec des cavites dans ces parois
DE102016122053A1 (de) * 2016-11-16 2018-05-17 GTP Schäfer Gießtechnische Produkte GmbH Herstellung von Speisereinsätzen im 3D-Druck

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2928166A1 (de) * 1979-07-12 1981-01-29 Eduard Dr Ing Baur Geschlossener speiser fuer giessformen
JPH0215849A (ja) * 1988-06-30 1990-01-19 Showa Tekkosho:Kk 金鋳型における押湯の保温構造
WO2001041955A1 (fr) * 1999-12-06 2001-06-14 Foseco International Limited Article refractaire pour la manipulation de metal fondu

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2928166A1 (de) * 1979-07-12 1981-01-29 Eduard Dr Ing Baur Geschlossener speiser fuer giessformen
JPH0215849A (ja) * 1988-06-30 1990-01-19 Showa Tekkosho:Kk 金鋳型における押湯の保温構造
WO2001041955A1 (fr) * 1999-12-06 2001-06-14 Foseco International Limited Article refractaire pour la manipulation de metal fondu

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108772537A (zh) * 2018-08-13 2018-11-09 共享装备股份有限公司 一种空气隔层式球冒口
EP3756788A1 (fr) 2019-06-24 2020-12-30 GTP Schäfer Gießtechnische Produkte GmbH Insert d'alimentation doté d'un contour extérieur avant et arrière
EP3756787A1 (fr) 2019-06-24 2020-12-30 GTP Schäfer Gießtechnische Produkte GmbH Insert d'alimentation à gaine

Also Published As

Publication number Publication date
EP1864729A3 (fr) 2009-04-15
DE202006009015U1 (de) 2006-08-10

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