EP2815819B1 - Alimentateur exothermique - Google Patents

Alimentateur exothermique Download PDF

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Publication number
EP2815819B1
EP2815819B1 EP13173270.3A EP13173270A EP2815819B1 EP 2815819 B1 EP2815819 B1 EP 2815819B1 EP 13173270 A EP13173270 A EP 13173270A EP 2815819 B1 EP2815819 B1 EP 2815819B1
Authority
EP
European Patent Office
Prior art keywords
feeder
pin
guide
exothermic
model
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.)
Not-in-force
Application number
EP13173270.3A
Other languages
German (de)
English (en)
Other versions
EP2815819A1 (fr
Inventor
Ömer Yücel Albayrak
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.)
LMA Motif Al Dokuem San Muem Ltd Sti
Original Assignee
LMA Motif Al Dokuem San Muem Ltd Sti
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 LMA Motif Al Dokuem San Muem Ltd Sti filed Critical LMA Motif Al Dokuem San Muem Ltd Sti
Priority to EP13173270.3A priority Critical patent/EP2815819B1/fr
Publication of EP2815819A1 publication Critical patent/EP2815819A1/fr
Application granted granted Critical
Publication of EP2815819B1 publication Critical patent/EP2815819B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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 present invention relates to a mini feeder for use in casting molds.
  • the proposed feeder is provided with at least an inner layer so that a pin attached to a mold model is prevented to get in direct contact with fragile inner walls of the feeder when mounted into a cast whilst cast preparation.
  • Mini feeders are used as means for additional material provision to cast volumes for compensation of shrinkages of solidifying materials filled into the volumes at molding processes.
  • Said feeders are placed into sand casts at cast preparation step.
  • a model with the shape of a desired product is placed into a sand cast and outside pressure is applied onto a said sand cast so that the shape of a said model appears within said sand cast.
  • Said model may be provided with pins which are suitable to fit into admission sections of feeders which are axial openings in feeders and define the positions of said feeders in sand cast, so that the model with said pins can be removed by leaving corresponding feeders behind in the sand cast.
  • the remaining void cast volume within said sand cast is expected to pose continuity with the admission section of a said feeder.
  • Exothermic feeder bodies usually comprise mixtures of several chemical components which give high exothermic reactions with each other, and said reactions are triggered by heat received from molten material pre-filled into void cast volumes of sand casts with shapes of desired products.
  • the heat activates high exothermic chemical reactions along feeder bodies, and reaction heat generated by said exothermic reactions melt pre-filled materials which usually are filled into internal volumes of said feeders. Once the pre-filled materials melt, they follow the halls formed by removing corresponding pins upon preparation of said sand mold, so that they arrive to the void cast volume and compensate the shrinkage due to solidification of molten material filled into the main void cast volume.
  • Exothermic feeders may comprise sand mixed with organic and inorganic binders, which may be chosen from polyurethanes, thermoplastic resins, no-bake resins, and sodium silicate; and reactants for at least an exothermic reaction.
  • the entrance of admission section may be provided with a breaker core for facilitation of damage-free separating the cast object from the feeders.
  • the farther end of the breaker axis may be suitable to allow the pin breakthrough, so that the pressure forces towards said pin don't cause deformation on said pin or model.
  • the tip of the pin may cause deformations and even fractures on feeder body and/or deformations on model and unintended shape of void volume. Also sand may mix into molten polymer mixture and damage the product.
  • WO 97 01 406 A1 explains a feeder provided with a one-piece inner part comprising ribs for guidance of corresponding pins when used; where the geometry of said inner part is rather difficult to produce, which can also be considered as a burden of elevated production costs.
  • the cushioning and positioning between feeder and pin has to be provided and/or improved.
  • An object of the present invention is to provide an exothermic feeder with a multi-element lining on its inner walls, which eliminates or minimizes the aforementioned technical problems.
  • Another object of the present invention is to provide an exothermic feeder which is of improved resistance against failures due to unexpected pressure applications in case of improper coupling with a corresponding pin.
  • Another object of the present invention is to provide an exothermic feeder which minimizes or prevents contamination of any sand used in sand mold preparation process to the feeding material in the interiors of said feeder.
  • DE20115140U1 discloses a feeder system with a feeder head and a tube-like body, wherein the tube-like body connects the feeder and the feeder head directly or indirectly to the casting or the hollow body form, and contributes the formation a crushing edge.
  • DE20118763U1 discloses a feeder insert for inserting in a casting mold, said feeder comprises a feeder body made of an exothermic and/or insulating material.
  • a hat-shaped feeder cap surrounding the outer wall of the feeder body under the formation of an insulating gap is movably arranged on the feeder body and is fixed against the feeder body before molding of the feeder insert.
  • Another object of the present invention is to provide exothermic feeder embodiments suitable for use with both spring-loaded and fixed pins.
  • An exothermic feeder for use in sand molds for metal casting which is provided with an admission section wherein said exothermic feeder is further provided a multi-element inner lining system, said inner lining system comprises a pin slot and a guide suitable for guiding a pin through the feeder axis wherein in use.
  • Said guide may further be located into the pin slot so that said guide is slidably movable along the guide range.
  • the present invention minimizes the above explained shortcomings of the prior art by preventing the damages on feeders, corresponding models and produced metallic objects using sand molds where the embodiments of the present invention are employed.
  • the present invention overcomes the above-mentioned shortcomings of the prior art by way of incorporating a feeder (1) with a multi-element inner lining system.
  • Said lining system prevents the inner wall of mini feeder from direct contact with a pin when used.
  • Said inner lining system comprises two parts surrounding the axis (10) of the feeder (1), which are namely pin slot (5) and guide (6).
  • Said parts (5 and 6) may be made of polymeric material, e.g. polystyrene.
  • the feeder (1) is provided with at least an opening called admission section (11), suitable for introduction of a pin (3) connected to a model (4).
  • the center of said admission section (11) is aligned around the feeder axis (10), so that a pin (3) can be introduced into the feeder (1) along the feeder axis (10).
  • One of the parts of the inner lining system is the guide (6) which guides the pin (3) into the feeder (1) so that a proper coupling between the feeder (1) and a model (4) connected to said pin (3) can be provided.
  • the second part of the multi-element inner lining system is the pin slot (5) made of a polymeric material e.g. polystyrene.
  • the pin slot (5) basically covers the inner walls of the feeder body (9) so that in case of deviation or yaw of the pin (3) from the axis (10) and direct contact of the pin (3) with said feeder body (9) is prevented.
  • presumable defects of feeder body (9) and also pin (3) and model (4) due to any pressure forces are also minimized or eliminated.
  • the farther end of the pin slot (5) with regard to the admission section (11) may be provided with a tip exit (12) weakened by perforating said pin slot along the feeder axis (10), so that in case of pressure directed towards the model the tip of the pin (3) can easily empierce the pin slot (5) using this weakened tip exit (12) without yawing from the feeder axis (10).
  • the admission section (11) of the feeder (1) may be provided with a breaker core (2) made of a durable material, preferably a metal or alloy.
  • the guide (6) can be either fixed to the pin slot (5) or coordinated so that the guide (6) can telescopically slide along the interiors of the pin slot (5).
  • Figure 1b and Figure 5b show the cross sections of both said feeder configurations each mounted onto a model (4) by coupling with a pin (3) arranged on said model (4) respectively.
  • the feeder (1) is suitable to be coupled with a pin (3) on a model (4) so that said pin (3) can come into contact with the pin slot (5) around the tip exit (12), and the guide (6) is suitable to surround the pin (3) so that no sand can pass between the guide (6) and pin (3).
  • the pin (3) may be either a fixed pin or preferably a spring-loaded pin.
  • the feeder (1) is pushed towards the model (4) so that the pin (3) can empierce the pin slot (5) around the tip exit (12) as shown in Fig.
  • a second embodiment shown in Figure 5b is especially advantageous when used with a fixed pin (3) rather than a spring-loaded pin.
  • the pin (3) may penetrate into the feeder (1) through the admission section (11) until the tip (13) of the pin (3) gets into contact with the pin slot (5) around the tip exit (12), and the breaker core (2) gets in contact with the model (4), thus said contact between the breaker core (2) and the model (4) provides adjacency between said breaker core (2) and a void mold volume appearing after removal of the model (4) from the feeder (1) upon preparation of a sand mold.
  • the guide (6) at this embodiment may be generally cylindrical, frustoconical, prismatical or frustum-shaped.
  • Fig. 8a and 8b show a final positioning between said feeder (1) and a model (4), where the feeder (1) is approached to said model (4) to the full extent.
  • the full extent of guide protrusion in terms of length (16) may be less than that of the guide range (14).
  • an amount of sand (8) may remain between the feeder (1) and the model (4) which facilitates the prevention of any defects on both the feeder (1) and the model (4).
  • a tube-shaped breaker core (2) might be placed into the guide (6), and the outer tip of the breaker core (2) may have a conical shape.
  • the polymeric material of the guide (6) is to be decomposed when subjected to molten metal whilst casting, thus said guide (6) doesn't provide channelization of molten casting material into the corresponding cast volume, and this function is to be fulfilled thanks to the above explained geometry of the breaker core (2).
  • Feeder body (9) may comprise a mixture of several chemical components which give high exothermic reactions with each other, and said reactions are to be triggered by heat received from molten material pre-filled into void cast volumes of sand casts with shapes of desired products wherein the feeder (1) is in use. Said heat is expected to activate high exothermic chemical reactions along feeder body (9), so that the reaction heat generated by said exothermic reactions melts pre-filled feed material usually present within the internal void volume (15) of said feeder (1).
  • Fig 8b shows a cross-section view of a such feeder (1) after full-range penetration of a pin (3) along the feeder axis (10), wherein the breaker core (2) contacts to a model (4) so that after removal of the model (4) along with the pin (3), a continuity between the internal void volume (15) and a cast volume in the sand mould evacuated by removal of the model.
  • the feeder embodiments according to the present invention prevent or minimize possible defects especially on inner walls of said feeders, as well as pins and models to be attached to said feeders.

Landscapes

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

Claims (10)

  1. Dispositif d'alimentation exothermique (1) destiné à être utilisé dans les moules en sable pour moulage de métal qui comporte un corps d'alimentation (9), une section d'admission (11) et un volume interne vide (15) caractérisé en ce que
    le dispositif d'alimentation exothermique (1) comporte en outre à l'intérieur du corps d'alimentation (9) un dispositif formant double paroi interne à plusieurs éléments, ledit dispositif formant double paroi interne à plusieurs éléments comprend une broche fendue (5) et un guide (6) destiné à guider une broche (3) à travers un axe de dispositif d'alimentation central (10) lorsque ledit dispositif d'alimentation doit être couplé à ladite broche (3).
  2. Dispositif d'alimentation exothermique selon la revendication 1, dans lequel la broche fendue (5) et/ou le guide (6) sont réalisés en un matériau polymère.
  3. Dispositif d'alimentation exothermique selon la revendication 2, dans lequel ledit matériau polymère est du polystyrène.
  4. Dispositif d'alimentation exothermique selon l'une quelconque des revendications 1 à 3, dans lequel ledit dispositif d'alimentation comporte un noyau de rupture (2).
  5. Dispositif d'alimentation exothermique selon l'une quelconque des revendications précédentes, dans lequel le guide (6) est situé dans la broche fendue (5) de telle sorte que le guide (6) peut être déplacé de manière coulissante suivant une plage de guidage (14).
  6. Dispositif d'alimentation exothermique selon l'une quelconque des revendications précédentes, dans lequel le contour dudit guide (6) est de forme sensiblement cylindrique, tronconique, prismatique ou tronquée.
  7. Dispositif d'alimentation exothermique selon la revendication 5, dans lequel le contour de ladite plage de guidage (14) est de forme sensiblement cylindrique, tronconique, prismatique ou tronquée.
  8. Dispositif d'alimentation exothermique selon l'une quelconque des revendications précédentes, dans lequel la broche fendue (5) comporte une sortie en pointe (12).
  9. Dispositif d'alimentation exothermique selon l'une quelconque des revendications précédentes, dans lequel le diamètre interne du guide (6) est inférieur ou égal au diamètre de la section d'admission (11).
  10. Dispositif d'alimentation exothermique selon la revendication 1, dans lequel le volume interne vide (15) dudit dispositif d'alimentation comporte une matière première.
EP13173270.3A 2013-06-21 2013-06-21 Alimentateur exothermique Not-in-force EP2815819B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13173270.3A EP2815819B1 (fr) 2013-06-21 2013-06-21 Alimentateur exothermique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13173270.3A EP2815819B1 (fr) 2013-06-21 2013-06-21 Alimentateur exothermique

Publications (2)

Publication Number Publication Date
EP2815819A1 EP2815819A1 (fr) 2014-12-24
EP2815819B1 true EP2815819B1 (fr) 2017-07-05

Family

ID=48672451

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13173270.3A Not-in-force EP2815819B1 (fr) 2013-06-21 2013-06-21 Alimentateur exothermique

Country Status (1)

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EP (1) EP2815819B1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2567139A (en) * 2017-09-08 2019-04-10 Foseco Int Feeder system
CN111036841A (zh) * 2019-12-31 2020-04-21 广西玉柴机器股份有限公司 一种气缸体铸件快速成型的方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29510068U1 (de) 1995-06-28 1996-10-31 Chemex Gmbh Speiser zur Verwendung beim Gießen von geschmolzenem Metall
DE20115140U1 (de) * 2000-11-30 2002-01-31 Luengen Gmbh & Co Kg As Speiser mit einem rohrähnlichen Körper
DE20118763U1 (de) * 2001-11-20 2003-01-02 Gtp Schaefer Giestechnische Pr Speisereinsatz mit Schutzkappe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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Publication number Publication date
EP2815819A1 (fr) 2014-12-24

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