EP0100272B1 - Verfahren und Vorrichtung zur Herstellung von Gussstücken sowie danach hergestellte Gussstücke - Google Patents

Verfahren und Vorrichtung zur Herstellung von Gussstücken sowie danach hergestellte Gussstücke Download PDF

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Publication number
EP0100272B1
EP0100272B1 EP19830401471 EP83401471A EP0100272B1 EP 0100272 B1 EP0100272 B1 EP 0100272B1 EP 19830401471 EP19830401471 EP 19830401471 EP 83401471 A EP83401471 A EP 83401471A EP 0100272 B1 EP0100272 B1 EP 0100272B1
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EP
European Patent Office
Prior art keywords
mould
particles
mold
inductor
cooling
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
Application number
EP19830401471
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English (en)
French (fr)
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EP0100272A1 (de
Inventor
Jean-Marie Joseph Schissler
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.)
Individual
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Individual
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.)
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Publication date
Priority claimed from FR8212933A external-priority patent/FR2530512A1/fr
Priority claimed from FR8220961A external-priority patent/FR2537472B2/fr
Application filed by Individual filed Critical Individual
Priority to AT83401471T priority Critical patent/ATE22827T1/de
Publication of EP0100272A1 publication Critical patent/EP0100272A1/de
Application granted granted Critical
Publication of EP0100272B1 publication Critical patent/EP0100272B1/de
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/02—Use of electric or magnetic effects

Definitions

  • the present invention relates generally to a new technique for heat treatment of molded parts and relates more particularly to a device for the manufacture of these parts.
  • the alloy in the molten state, is first cast in the mold. It solidifies there, then gradually cools there to room temperature, after which the demolding or unhooking operation is carried out.
  • the molded part generally having to undergo a heat treatment, it is consequently advisable to reheat it at a temperature higher than room temperature to make it undergo an appropriate thermal cycle and which is a function of the alloy considered and the qualities of the part molded that we want to obtain, it being understood that the temperature range of the heat treatment adopted will always be between ambient temperature and the solidus temperature of the alloy considered.
  • the present invention aims to solve this problem by proposing a new device for manufacturing molded parts, from a liquid called to solidify, such as for example any alloy, which device also allows savings to be made. considerable energy and manufacturing time, and to give the molded part all the qualities sought by the fact that one can choose and impose on this part or on one or more distinct parts thereof, in the mold, the or the most appropriate cooling laws that can easily be varied at will and within significant limits.
  • the invention relates to a device for the manufacture of molded parts and of the type comprising an electric heating means of a molded part and solidified in a mold in which this heating means is incorporated, characterized in that this the latter consists of at least one electric heating resistor or at least one inductor completely embedded or fitted inside the mold to impose on at least part of the solidified part in the molding space an appropriate heat treatment.
  • a variant of this device is characterized in that it comprises an inductor arranged around the weight collar at the upper part of the mold, and / or at least one inductor provided at the level of the mold supply system, while a cooling circuit is arranged inside this mold.
  • the aforementioned electrical resistance or the inductor is arranged inside the mold, over the entire height of the latter or over only part of this height to affect for example a hollow or projecting part, molding space.
  • the electric heating resistance consists of conductive particles of current distributed uniformly or not in the mass of the mold according to a density capable of allowing the passage of a current supplied by a source of electrical power connected to said mold.
  • the aforementioned particles consist of metallic particles based on metals or alloys, oxide particles such as for example metallic oxides, metallic silicate particles, or else a mixture of the aforementioned particles.
  • the particles distributed in the mass of the mold can be more or less dispersed or else agglomerated together in a more or less compact form.
  • a mineral or organic binder can be added to the mass of the mold to maintain the structure of the particles in this mass.
  • FIGS. 1 to 3 show three temperature curves (T ° C) as a function of time (t) (the temperature and time scales being the same for the three curves), and in which: Figure 1 illustrates the cooling of an example of steel being solidified in a mold; FIG. 2 illustrates the heat treatment applied to this same steel, after the cooling illustrated in FIG. 1; and FIG. 3 illustrates the controlled heat treatment carried out according to the principles of the invention, this treatment being applied to the same steel as that of FIGS. 1 and 2 which illustrate the prior art.
  • Figure 4 is a schematic view of a mold equipped with means according to the invention.
  • Figures 5 and 6 are also schematic views illustrating two embodiments of the device according to the invention.
  • Figure 7 is a. schematic view of a mold with a particular electric heating resistance.
  • a molten alloy is poured into a mold which is then at a temperature above about 1500 ° C. then, by cooling in this mold, the alloy solidifies, that is to say progressively passes from l liquid state in the solid state, as shown respectively in A to B in FIG. 1. Finally, the molded and solidified alloy completes its cooling down to room temperature, as shown in the portion curve C, the latter having, for the alloy considered, a bearing D which, in the case of the alloy considered, corresponds to a short-term heat release resulting from a transformation within this alloy.
  • the cast steel part When the cast steel part is almost completely cooled, it is then subjected to the heat treatment according to the curve in FIG. 2 which again represents only one example of the thermal cycle for the alloy considered.
  • the material is reheated as shown by the portion of curve E, to a temperature of 1100 ° C. Then the part is kept at this temperature for a certain time, as seen in F, before allowing it to cool, as can be seen in G.
  • the level H corresponds to a much shorter holding time (t i ) compared to the level F (t 2 ) with the previously known method.
  • t i holding time
  • the device described allows not only to avoid the loss of heat energy of the alloy during cooling in the mold (figure 1) and to avoid a considerable energy contribution for the reheating treatment (figure 2), but it also allows to treat the phases of the alloy (solid solutions, precipitates, etc.) from the start.
  • the heat treatment can be implemented with ease, whether it is simple or complex, that is to say if it comprises one or more thermal cycles and / or comprises one or more operations in relation to this or these cycles.
  • the new way of operating can also be applied to the material before a possible hot unhooking operation itself preceding, if necessary, other operations.
  • a device essentially comprises a mold 1 with, at its upper part, a counterweight 2, this mold comprising a molding space 3 around which is arranged, according to a helical winding, an induction heating system 4 connected to a suitable supply 5.
  • a chute and a mold supply duct which duct communicates with the molding space 3 .
  • the inductor 4 it will be possible to provide the sufficient amount of heat energy at the end of solidification of the material, as explained previously, so as to be able to stabilize the temperature of this material when it is desired. and to be able to modulate the subsequent cooling.
  • the passage time and the frequencies of the current applied to the inductor 4 can be chosen at will and will depend on the metal part or the part of this part which one wants to treat.
  • the inductor 4 will preferably be constituted by a tubular element, as can be seen in FIG. 4, inside which a cooling fluid can circulate as shown by the arrows F in said figure.
  • a cooling fluid can circulate as shown by the arrows F in said figure.
  • an electric heating resistor (not shown) and suitably arranged in the mold so as to be able to heat the molded part or such and such a part of it.
  • the inductor 4 and / or the electric heating resistance can be arranged over the entire height and the entire periphery of the molding space 3, as seen in FIG. 4, or over the entire height of this space and only over part of its periphery, as seen in FIG. 5, or even over a small part of the height of the molding space, for example in a cavity 8 formed in this space, as shown see in Figure 6.
  • an inductor 4a has been provided in the cavity 8, and another inductor 4b which surrounds the upper part of the molding space 3.
  • the nature and the constitution of the mold 1 can be arbitrary.
  • the mold 1 can be a non-metallic mold, for example a sand mold as shown in FIG. 4, or even a metallic mold in which the inductor will be fixed or fitted, by any suitable means. 4 and / or the electric heating resistance.
  • an inductor has been shown at 9 which surrounds the flyweight neck 2 at the upper part of the mold 1.
  • the use of induction heating at the neck of the counterweight will make it possible to maintain this part in the liquid state at a temperature determined according to the alloy considered, and it will thus be possible to modulate the cooling of the neck of the flyweight, including solid state cooling.
  • the heating of the counterweight 2 by the inductor 9 will advantageously make it possible to significantly reduce the volume of said flyweight located above the neck.
  • the inductor 9 may be arranged above the mold 1, as seen in Figure 4, but it could very well be arranged in the mold around the part 2a of the neck (see Figure 4). It will be added here that inductors can be provided at other parts of the device, such as for example on the trough 6 and / or the supply duct 7.
  • FIG. 7 a mold 1 has been shown containing around the molding cavity 3, current-conducting particles 10 embedded in the mass of said mold and allowing the transfer of heat energy to the molding cavity 3 to heat it appropriately and depending on the particle distribution.
  • a thermal gradient control can be obtained by the distribution, the particle size and the density of the particles embedded in the mold 1.
  • particles 10 are distributed uniformly or not in the mass of the mold which may consist of sand or any other suitable material. As can be seen in FIG. 7, the particles 10 can be more or less dispersed or agglomerated together in a more or less compact form, and this so as to allow the passage of a current which is supplied for example to the using electrodes 11 integral with an insulating wall 12 surrounding the mold 1, said electrodes being connected to a source of electrical power not shown.
  • the more or less dispersed or agglomerated conductive particles 10 constitute as many points or zones of transfer of electrical energy making it possible to control the heating of the molding cavity 3, this heating obviously being a function of the particle size and of the distribution density.
  • the particles 10 may be particles based on suitable metals or alloys, or alternatively particles of oxides, such as for example metal oxides, or particles of metallic silicates. It is also possible to use particles either sintered or composite.
  • a binder can be added to the mass of the mold 1 to maintain the structure of particles in said mass, this binder can be mineral or organic.
  • the device of the invention can be applied to all moldable materials and in particular to all heat treatments of cast metal alloys, resulting in a structural evolution of these alloys, therefore in general the appearance of new characteristics. . And, by structural evolution, it is necessary to hear any evolution of the metallographic structure having appealed either to a mechanism known as "diffusional", or to a mechanism known as “of shearing”, or to the association of these two mechanisms.

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

Claims (7)

1. Vorrichtung zur Herstellung von Gusstücken und derjenigen Gattung die ein Mittel zum elektrischen Erwärmen eines, in einer Giessform (1) in welcher dieses Heizmittel eingebaut ist, gegossenen und erstarrten Werkstücks, dadurch gekennzeichnet, dass das Heizmittel aus wenigstens einem elektrischen Heizwiderstand oder aus wenigstens einem Induktor (4), der völlig im Inneren der Giessform (1) eingebettet bzw. eingelassen ist, besteht, um wenigstens einen Teil des in dem Formenraum (3) erstarrten Werkstücks einer geeigneten Wärmebehandlung zu unterwerfen.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass sie einen am oberen Teil der Giessform (1) um den Speiserhals (2) herum angeordneten Induktor (9) und/oder wenigstens einen an dem Giessystem (6, 7) der Giessform vorgesehenen Induktor umfasst, während ein Kühlkreislauf im Inneren dieser Giessform angeordnet ist.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der vorgenannte Heizwiderstand bzw. der Induktor (4) innerhalb der Giessform (1) über deren ganzen Höhe oder nur über einen Teil dieser Höhe angeordnet ist, um z.B. auf einen hohlen (8) oder vorstehenden Teil des Formenraumes (3) einzuwirken.
4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der elektrische Heizwiderstand aus stromleitenden Teilchen (10) besteht, die in der Masse der Giessform (1) gleichförmig oder nicht gleichförmig verteilt sind, entsprechend einer Dichte, die geeignet ist, den Durchfluss eines durch eine mit der besagten Giessform verbundene elektrische Speisequelle (11) gelieferten Stromes zu gestatten.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die vorgenannten Teilchen (10) aus metallischen Teilchen, die auf Metalle oder Legierungen, Oxidteilchen wie z.B. metallischen Oxiden, Teilchen aus metallischen Silikaten oder einem Gemisch der vorgennten Teilchen basiert sind.
6. Vorrichtung nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass die in der Masse der Giessform (1) verteilten Teilchen (10) mehr oder weniger zerstreut oder miteinander in einer mehr oder weniger kompakten Gestalt zusammengeballt sein können.
7. Vorrichtung nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass man der Masse der Giessform (1) ein Aufrechterhalten des Aufbaues der Teilchen in dieser Masse zusetzt.
EP19830401471 1982-07-23 1983-07-18 Verfahren und Vorrichtung zur Herstellung von Gussstücken sowie danach hergestellte Gussstücke Expired EP0100272B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83401471T ATE22827T1 (de) 1982-07-23 1983-07-18 Verfahren und vorrichtung zur herstellung von gussstuecken sowie danach hergestellte gussstuecke.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8212933A FR2530512A1 (fr) 1982-07-23 1982-07-23 Fabrication de pieces moulees maintenues en temperature par chauffage pour traitement thermique ulterieur
FR8212933 1982-07-23
FR8220961 1982-12-14
FR8220961A FR2537472B2 (fr) 1982-12-14 1982-12-14 Fabrication de pieces moulees maintenues en temperature par chauffage pour traitement thermique ulterieur

Publications (2)

Publication Number Publication Date
EP0100272A1 EP0100272A1 (de) 1984-02-08
EP0100272B1 true EP0100272B1 (de) 1986-10-15

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EP19830401471 Expired EP0100272B1 (de) 1982-07-23 1983-07-18 Verfahren und Vorrichtung zur Herstellung von Gussstücken sowie danach hergestellte Gussstücke

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EP (1) EP0100272B1 (de)
DE (1) DE3366857D1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8844607B2 (en) 1998-11-20 2014-09-30 Rolls-Royce Corporation Method and apparatus for production of a cast component

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2674154B1 (fr) * 1991-03-20 1993-07-23 Chavanne Ketin Procede de fabrication par moulage de pieces de fonderie telles que cylindre de laminoir et lingot de forge, dispositif de mise en óoeuvre du procede et cylindre ou lingot de forge obtenus.
GB9209308D0 (en) * 1992-04-30 1992-06-17 Burdett Savile Casting technique
US6932145B2 (en) 1998-11-20 2005-08-23 Rolls-Royce Corporation Method and apparatus for production of a cast component
GB2459509B (en) 2008-04-25 2011-05-11 Goodwin Plc An apparatus for casting and a method of casting

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE470196C (de) * 1929-01-07 E H Alexander Meissner Dr Ing Verfahren zum Erwaermen von nicht metallischen Gussformen oder von Gussstuecken
CH83066A (de) * 1918-10-10 1920-04-01 Zeerleder Alfred Dr Von In einen Ofen eingebauter elektrischer Widerstandsheizkörper für hohe Temperaturen
US1417638A (en) * 1921-04-06 1922-05-30 Sowers Ossa Method of controlling the condition of castings
DE367637C (de) * 1921-05-01 1923-01-25 Westdeutsche Thomasphosphat We Vorrichtung zur Vermeidung der Lunkerbildung und Seigerung beim Giessen von Bloeckenaus Stahl oder anderen Metallen
DE496314C (de) * 1927-05-05 1930-04-16 Eisen U Stahlwerk Hoesch Akt G Verfahren zur Waermebehandlung fester oder halbfluessiger Gussbloecke unter Anwendung von Hochfrequenzstroemen
DE764264C (de) * 1937-11-03 1952-07-24 Bochumer Ver Fuer Gussstahlfab Verfahren zum Herstellen von Stahlbloecken aus besonders hochwertigen Staehlen
DE925856C (de) * 1940-04-16 1955-03-31 Gussstahlwerk Bochumer Ver Ag Giessform zur Herstellung hochwertiger Staehle
US3861449A (en) * 1969-05-05 1975-01-21 Howmet Corp Method of casting metallic objects

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8844607B2 (en) 1998-11-20 2014-09-30 Rolls-Royce Corporation Method and apparatus for production of a cast component

Also Published As

Publication number Publication date
EP0100272A1 (de) 1984-02-08
DE3366857D1 (en) 1986-11-20

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