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EP0051536A1 - Process for casting metallic pieces - Google Patents

Process for casting metallic pieces Download PDF

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Publication number
EP0051536A1
EP0051536A1 EP81401725A EP81401725A EP0051536A1 EP 0051536 A1 EP0051536 A1 EP 0051536A1 EP 81401725 A EP81401725 A EP 81401725A EP 81401725 A EP81401725 A EP 81401725A EP 0051536 A1 EP0051536 A1 EP 0051536A1
Authority
EP
European Patent Office
Prior art keywords
casting
groove
cooling plate
mold
impression
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Withdrawn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
EP81401725A
Other languages
German (de)
French (fr)
Inventor
Roger Sogner
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.)
Avisa SA
Original Assignee
Avisa SA
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 Avisa SA filed Critical Avisa SA
Publication of EP0051536A1 publication Critical patent/EP0051536A1/en
Withdrawn legal-status Critical Current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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor

Definitions

  • sand molds are generally used composed of two integral chassis, inside which the impression of the object to be obtained has been made.
  • the Applicant has established, and this constitutes an object of the invention, that parts of excellent quality can be obtained by placing the cooling plate at the top of the mold and by using this plate to replace the half - upper mold.
  • the method according to the invention is characterized in that an impression of the object to be produced is produced in a lower half-mold which has a pouring groove on its upper surface, which this impression is covered with a plate cooling which leaves clear the origin of the casting groove and that after having introduced into this groove the quantity of molten metal necessary, this groove is covered with a heat shield to slow down the rate of freezing of the molten metal in the groove of casting.
  • This arrangement is particularly advantageous for various reasons.
  • the installation of the cooling plate which is simply placed on the lower half-mold, does not require any handling or blocking device.
  • the impression of the object in the mold has surfaces for receiving this plate and ensuring its centering. The elimination of the upper half-mold therefore saves material (sand) and labor.
  • the molten metal does not travel between the sand bed and the cooling plate and that, therefore, the part once finished, does not need deburring, except for the breakage of the casting.
  • the cooling plate can be used to act as a counterform. To this end, it has raised or very slight reliefs. It is surprisingly found that even these hollows are filled with cast iron without any apparent escape of trapped air.
  • the method according to the invention thus allows yields much higher than the yields usually accepted.
  • the amount of unused iron in the casting groove is very low compared to the previous processes with weights.
  • the mold shown in FIG. 1 comprises a sand frame 1, filled with foundry sand 2, in which the impression 3 of the part to be produced has been produced.
  • the upper surface of the sand has a surface 4 intended to receive the cooling plate 5, which carries on its underside a counterform 6 of the imprint 3, which ensures very precise centering of this plate.
  • the chassis 1 comprises a so-called "attack" casting groove 7, the feed portion 8 of which is disposed outside of the bearing surface 4 and which opens into the cavity 3.
  • FIG. 2 represents the cooling plate 5, provided with the raised core 6 acting as a counterform.
  • FIG. 3 shows the mold during the metal casting operation, the cooling plate 5 being in place on the chassis 1.
  • FIG. 4 represents the mold after the casting of the metal, with a block 9 of refractory material, forming a heat shield, placed on the part 8 of the casting groove, with a view to slowing down the cooling and the freezing of the molten metal.
  • the block 9 is slightly raised by wedges 10 above the casting groove.
  • the device which has just been described is naturally not limited to the casting of cast iron, but can be used for the casting of other metals such as bronze.
  • the lower half-mold is not necessarily a sand frame, the invention applying with the same advantages to a lower half-shell mold.

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

Abstract

A process for casting metallic pieces, in particular of cast iron, by using a mould and a cooling plate. According to the invention, an impression 3 of the object to be produced is formed in a half-mould 1 which has a casting groove 7 on its upper surface, this impression 3 is covered with a cooling plate 5 which leaves open the beginning 8 of the casting groove 7 and, after introducing the required quantity of molten metal into this groove, the latter is covered with a thermal screen 9 to slow down the solidification rate of the molten metal in the casting groove. Any piping at the top of the casting is thereby avoided. <IMAGE>

Description

Dans les procédés connus de fonderie pour la coulée des métaux et de la fonte, en particulier, on emploie généralement des moules à sable composés de deux châssis solidarisés, à l'intérieur desquels on a réalisé l'empreinte de l'objet à obteniroIn known foundry processes for the casting of metals and cast iron, in particular, sand molds are generally used composed of two integral chassis, inside which the impression of the object to be obtained has been made.

Il est connu, également, d'employer dans ces moules des plaques de refroidissement dont l'effet est d'obtenir un grain plus fin. Ceci est avantageux, par exemple, pour les pièces de fonte, en vue d'obtenir un beau poli.It is also known to use cooling plates in these molds, the effect of which is to obtain a finer grain. This is advantageous, for example, for castings, in order to obtain a beautiful polish.

Ces plaques de refroidissement sont toujours placées à la partie inférieure du moule, car il était jusqu'à ce jour communément admis que les parties saines de la pièce devaient se trouver à la partie inférieure au moment de la coulée. Les dangers de retassures étaient évités par la présence de masselottes.These cooling plates are always placed at the bottom of the mold, because it was until now commonly accepted that the healthy parts of the part should be at the bottom at the time of casting. The dangers of shrinkage were avoided by the presence of weights.

La Demanderesse a établi, et ceci constitue un objet de l'invention, que l'on peut obtenir des pièces d'excellente qualité en plaçant la plaque de refroidissement à la partie supérieure du moule et en se servant de cette plaque pour remplacer le demi-moule supérieur.The Applicant has established, and this constitutes an object of the invention, that parts of excellent quality can be obtained by placing the cooling plate at the top of the mold and by using this plate to replace the half - upper mold.

Le procédé selon l'invention se caractérise en ce qu'on réalise une empreinte de l'objet à réaliser dans un demi-moule inférieur qui présente à sa surface supérieure une rainure de coulée, que l'on recouvre cette empreinte d'une plaque de refroidissement qui laisse dégagée l'origine de la rainure de coulée et qu'après avoir introduit dans cette rainure la quantité de métal fondu nécessaire, on recouvre cette rainure d'un écran thermique pour ralentir la vitesse de figeage du métal fondu dans la rainure de coulée.The method according to the invention is characterized in that an impression of the object to be produced is produced in a lower half-mold which has a pouring groove on its upper surface, which this impression is covered with a plate cooling which leaves clear the origin of the casting groove and that after having introduced into this groove the quantity of molten metal necessary, this groove is covered with a heat shield to slow down the rate of freezing of the molten metal in the groove of casting.

Cette disposition est particulièrement avantageuse pour diverses raisons.This arrangement is particularly advantageous for various reasons.

La mise en place de la plaque de refroidissement, qui est simplement posée sur le demi-moule inférieur, ne nécessite aucun dispositif de manutention ou de blocageo Dans une forme préférée de réalisation, l'empreinte de l'objet dans le moule comporte des portées pour recevoir cette plaque et en assurer le centrage. L'élimination du demi-moule supérieur entraîne donc une économie de matière (sable) et de travail.The installation of the cooling plate, which is simply placed on the lower half-mold, does not require any handling or blocking device. In a preferred embodiment, the impression of the object in the mold has surfaces for receiving this plate and ensuring its centering. The elimination of the upper half-mold therefore saves material (sand) and labor.

Le risque de retassures à la partie supérieure de la pièce coulée est complètement éliminé par la présence de l'écran sur la rainure de coulée, qui, en retardant le figeage du métal qu'elle contient, permet d'alimenter complètement la pièce pendant son figeage.The risk of shrinkage at the top of the casting is completely eliminated by the presence of the screen on the casting groove, which, by delaying the freezing of the metal it contains, allows the part to be completely fed during its freezing.

La Demanderesse a constaté l'effet surprenant que, contrairement aux préjugés généralement admis, la pièce se présente, même et surtout dans sa partie supérieure saine, sans défautset sans soufflures.The Applicant has noted the surprising effect that, contrary to generally accepted prejudices, the part presents itself, even and above all in its healthy upper part, without defects and without blowing.

Elle a constaté également que le métal en fusion ne chemine pas entre le lit de sable et la plaque de refroidissement et que,de ce fait, la pièce une fois terminée, n'a pas besoin d'ébarbage, sauf à la cassure de la coulée.It also noted that the molten metal does not travel between the sand bed and the cooling plate and that, therefore, the part once finished, does not need deburring, except for the breakage of the casting.

La plaque de refroidissement peut être utilisée pour faire office de contre-forme. A cet effet, elle présente des reliefs en saillie ou en très légers creux. On constate de façon surprenante que même ces creux se remplissent de fonte sans échappement apparent de l'air emprisonné.The cooling plate can be used to act as a counterform. To this end, it has raised or very slight reliefs. It is surprisingly found that even these hollows are filled with cast iron without any apparent escape of trapped air.

Le procédé selon l'.invention permet ainsi des rendements très supérieurs aux rendements habituellement admis. De plus, la quantité de fonte inutilisée dans la rainure de coulée est très faible par rapport aux procédés antérieurs avec masselottes.The method according to the invention thus allows yields much higher than the yields usually accepted. In addition, the amount of unused iron in the casting groove is very low compared to the previous processes with weights.

Les dessins annexés illustrent la mise en oeuvre de l'invention. Sur ces dessins t

  • La figure 1 représente un moule selon l'invention, avec sa plaque de refroidissement ;
  • La figure 2 est une vue d'une plaque de refroidissement servant de contre-forme y
  • La figure 3 illustre la coulée du métal dans le moule y
  • La figure 4 montre le moule équipé de son écran sur la rainure de coulée.
The accompanying drawings illustrate the implementation of the invention. On these drawings t
  • Figure 1 shows a mold according to the invention, with its cooling plate;
  • Figure 2 is a view of a cooling plate serving as a counter-form y
  • Figure 3 illustrates the pouring of metal into the mold y
  • Figure 4 shows the mold with its screen on the casting groove.

Le moule représenté sur la figure 1 comprend un châssis à sable 1, rempli de sable de fonderie 2, dans lequel on a réalisé l'empreinte 3 de la pièce à réaliser.The mold shown in FIG. 1 comprises a sand frame 1, filled with foundry sand 2, in which the impression 3 of the part to be produced has been produced.

La surface supérieure du sable présente une portée 4 destinée à recevoir la plaque de refroidissement 5, qui porte sur sa face inférieure une contre-forme 6 de l'empreinte 3, ce qui assure un centrage très précis de cette plaque.The upper surface of the sand has a surface 4 intended to receive the cooling plate 5, which carries on its underside a counterform 6 of the imprint 3, which ensures very precise centering of this plate.

Le châssis 1 comporte une rainure de coulée 7 dite "attaque", dont la partie d'alimentation 8 est disposée à l'extérieur de la portée 4 et qui débouche dans l'empreinte 3.The chassis 1 comprises a so-called "attack" casting groove 7, the feed portion 8 of which is disposed outside of the bearing surface 4 and which opens into the cavity 3.

La figure 2 représente la plaque de refroidissement 5, munie du noyau en relief 6 faisant office de contre-forme.FIG. 2 represents the cooling plate 5, provided with the raised core 6 acting as a counterform.

La figure 3 représente le moule pendant l'opération de coulée du métal, la plaque de refroidissement 5 étant en place sur le châssis 1.FIG. 3 shows the mold during the metal casting operation, the cooling plate 5 being in place on the chassis 1.

La figure 4 représente le moule après la coulée du métal, avec un bloc 9 de matériau réfractaire,formant écran thermique, disposé sur la partie 8 de la rainure de coulée,en vue de ralentir le refroidissement et le figeage du métal fondu. Comme on le voit sur le dessin, le bloc 9.est légèrement surélevé par des cales 10 au-dessus de la rainure de coulée.FIG. 4 represents the mold after the casting of the metal, with a block 9 of refractory material, forming a heat shield, placed on the part 8 of the casting groove, with a view to slowing down the cooling and the freezing of the molten metal. As seen in the drawing, the block 9 is slightly raised by wedges 10 above the casting groove.

Le dispositif qui vient d'être décrit n'est naturellement pas limité à la coulée de la fonte, mais peut être utilisé pour la coulée d'autres métaux tels que le bronze.The device which has just been described is naturally not limited to the casting of cast iron, but can be used for the casting of other metals such as bronze.

De même, le demi-moule inférieur n'est pas nécessairement un châssis à sable, l'invention s'appliquant avec les mêmes avantages à un demi-moule inférieur en coquille.Similarly, the lower half-mold is not necessarily a sand frame, the invention applying with the same advantages to a lower half-shell mold.

Claims (4)

1.- Procédé pour la coulée de pièces métalliques, notamment en fonte, par emploi d'un moule et d'une plaque de refroidissement, caractérisé en ce que l'on réalise une empreinte (3) de l'objet à réaliser dans un demi-moule (1) qui présente à sa surface supérieure une rainure de coulée (7), en ce que l'on recouvre cette empreinte (3) d'une plaque de refroidissement (5) qui laisse dégagée l'origine (8) de la rainure de coulée (7) et en ce quoaprès avoir introduit dans cette rainure la quantité de métal fondu nécessaire, on recouvre la rainure de coulée d'un écran thermique (9) pour ralentir la vitesse de figeage du métal fondu dans la rainure de coulée.1.- Method for the casting of metal parts, in particular cast iron, by using a mold and a cooling plate, characterized in that an impression (3) of the object to be produced is produced in a half-mold (1) which has on its upper surface a pouring groove (7), in that this imprint (3) is covered with a cooling plate (5) which leaves the origin (8) clear of the casting groove (7) and in that o after having introduced into the groove the quantity of molten metal required, covers the casting groove of a heat shield (9) to slow the speed of solidification of molten metal in the casting groove. 2.- Procédé selon la revendication 1, caractérisé en ce que l'empreinte réalisée dans le demi-moule (1) comporte une portée (4) pour recevoir et assurer le centrage de la plaque de refroidissement (5).2.- Method according to claim 1, characterized in that the impression made in the half-mold (1) has a bearing surface (4) for receiving and ensuring the centering of the cooling plate (5). 3.- Procédé selon l'une des revendications 1 et 2, caractérisé en ce que la plaque de refroidissement (5) fait office de contre-forme.3.- Method according to one of claims 1 and 2, characterized in that the cooling plate (5) acts as a counter-form. 4.- Pièces métalliques coulées réalisées par application du procédé selon l'une des revendications 1 à 3.4.- Cast metal parts produced by applying the method according to one of claims 1 to 3.
EP81401725A 1980-10-29 1981-10-28 Process for casting metallic pieces Withdrawn EP0051536A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8023153A FR2492695A1 (en) 1980-10-29 1980-10-29 METHOD FOR CASTING METALLIC PARTS
FR8023153 1980-10-29

Publications (1)

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EP0051536A1 true EP0051536A1 (en) 1982-05-12

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EP81401725A Withdrawn EP0051536A1 (en) 1980-10-29 1981-10-28 Process for casting metallic pieces

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE478318C (en) * 1926-01-03 1929-06-24 Abteilung Metallwerke Process for casting drawing dies from heavy metal carbides
US1727565A (en) * 1928-03-09 1929-09-10 Wilcox Rich Corp Chill plate for use in molding tappet heads
FR1290019A (en) * 1961-05-26 1962-04-06 Bohler Et Co Ag Geb Wear parts cast in hard alloys and their manufacturing process
FR2042687A1 (en) * 1969-05-16 1971-02-12 Iit Res Inst Precision casting mould for titanium and tit - anium alloys used for tools and aircraft

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE478318C (en) * 1926-01-03 1929-06-24 Abteilung Metallwerke Process for casting drawing dies from heavy metal carbides
US1727565A (en) * 1928-03-09 1929-09-10 Wilcox Rich Corp Chill plate for use in molding tappet heads
FR1290019A (en) * 1961-05-26 1962-04-06 Bohler Et Co Ag Geb Wear parts cast in hard alloys and their manufacturing process
FR2042687A1 (en) * 1969-05-16 1971-02-12 Iit Res Inst Precision casting mould for titanium and tit - anium alloys used for tools and aircraft

Also Published As

Publication number Publication date
FR2492695B1 (en) 1983-04-29
FR2492695A1 (en) 1982-04-30

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Inventor name: SOGNER, ROGER