EP0072329A1 - Verfahren zur Herstellung eines keramischen Schalenformteils und so erhaltenes Formteil - Google Patents

Verfahren zur Herstellung eines keramischen Schalenformteils und so erhaltenes Formteil Download PDF

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Publication number
EP0072329A1
EP0072329A1 EP82401491A EP82401491A EP0072329A1 EP 0072329 A1 EP0072329 A1 EP 0072329A1 EP 82401491 A EP82401491 A EP 82401491A EP 82401491 A EP82401491 A EP 82401491A EP 0072329 A1 EP0072329 A1 EP 0072329A1
Authority
EP
European Patent Office
Prior art keywords
box
shell
refractory
core
blades
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.)
Granted
Application number
EP82401491A
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English (en)
French (fr)
Other versions
EP0072329B1 (de
Inventor
Marcel Flenne
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.)
Creusot Loire SA
Original Assignee
Creusot Loire 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 Creusot Loire SA filed Critical Creusot Loire SA
Priority to AT82401491T priority Critical patent/ATE18725T1/de
Publication of EP0072329A1 publication Critical patent/EP0072329A1/de
Application granted granted Critical
Publication of EP0072329B1 publication Critical patent/EP0072329B1/de
Expired 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
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns

Definitions

  • the present invention relates to a method of making a mold element (mold or core) constituted by a ceramic shell and to the mold element thus obtained. This process is intended to be used in precision foundry.
  • the ceramic shell molding process derived from the lost wax process is known from French patent 1,204,586. This process consists in producing a thin refractory shell by deposition of successive refractory layers around a wax model. Each refractory layer is deposited using a slip comprising an acid reaction binder or a basic reaction and a refractory filler. Each coating of the slip is dusted (stuccoing) using a refractory powder.
  • the binder must be refractory and have cold and hot agglomerating properties. Either ethyl silicate (organic silicate with an acid reaction) or sodium silicate (inorganic silicate with an alkaline reaction) is used.
  • the shell is often formed in accordance with French patent 1,327,999 by depositing a layer with an alkaline binder followed by a layer with an acid binder in order to promote the setting of the binders.
  • the wax model coated with its refractory shell is dewaxed in a heating oven.
  • a core of this type can be produced in several parts, but mounting the entire core then poses delicate positioning problems.
  • the subject of the present invention is a method for making a mold element with a refractory shell, of large dimensions, the various refractory layers of which, in particular the outer layer which will come into contact with the metal, have a binder based on silicate of ethyl which gives good refractoriness and great imprint fidelity.
  • This process makes it possible to produce a one-piece mold element of large dimensions having undercut recesses. It allows in particular to core having undercut recesses such as a core used for molding a wheel or a rotor with turbine engine blades.
  • the method makes it possible to produce a one-piece core with a refractory shell having internally partitions provided with recesses and joining the outer walls of the shell leaving internal cavities which provide a lighter structure having advantages from the point of view of rigidity and trimming. solidification.
  • the method according to the invention consists in forming a shell by depositing, in contact with a rigid box, a succession of refractory layers by a slip comprising a binder and a refractory powder, each deposition of a layer being followed by dusting with a refractory powder, and it is characterized in that the first layer is deposited directly in contact with the box, the surface of which is coated with a release agent.
  • the different layers are deposited using an ethyl silicate slip.
  • the method consists in mounting, inside the box, blades added in plastic material to form the refractory shell and in dismantling the box, leaving the blades inside the shell.
  • the core-type mold element obtained by the process has undercut recesses which correspond to blades and it is characterized by the fact that it forms two walls joined by partitions comprising recesses corresponding to the blades and forms between said walls and the said partitions of the internal cavities which open outwards.
  • a box 1 is used which matches the external shape of the ceramic shell mold element which it is desired to obtain.
  • This multi-part box is made of a rigid material, preferably laminated resin, by overmolding a wooden core.
  • the refractory shell is then made up of several layers deposited successively on the internal faces of the box and on the attached parts which are eliminated during cooking.
  • a slip is used which is introduced into the box.
  • This slip has a refractory filler and a binder having cold and hot agglomerating properties.
  • This binder is formed by organic silicate with an acid reaction (ethyl silicate) of alcohol and acid. The hydrolysis of ethyl silicate in an alcoholic medium gives colloidal silica.
  • the dep8t by the slip is followed by a dusting (stuccoing) of the layer using a refractory powder. Gelation is obtained by hot air or ammonia vapor. The operation is repeated several times until a shell of sufficient thickness is obtained.
  • the first layer is deposited directly in contact with the box. It is carried out using a slip with a binder of ethyl silicate.
  • the monobloc shell is extracted from the box. At this stage the plastic parts remain embedded in the shell.
  • the shell is then cooked in a heating oven. During this cooking, the attached plastic parts disintegrate, the residue being removed after cooking. Likewise the binder alcohol is eliminated during cooking. At the end of cooking, the mold element has recesses corresponding to the plastic parts that cooking has made it possible to eliminate.
  • the method according to the invention applies to the production of mold elements having a shape of revolution such as the cores of single or double wheels of turbomachinery but also to mold elements of parts not having a shape of revolution (Pelton wheel augst for example).
  • FIGS. 1, 2, 4,7 the rigid gearbox is represented by FIGS. 1, 2, 4,7.
  • This box 1 corresponds to the outside of the wheel that we want to obtain. It consists of several separable parts.
  • the box shown in the drawings has two flanges 11 and 12.
  • the recesses of the core corresponding to the blades of the wheel and the inserts therefore have substantially the profile of the blades of the wheel.
  • a set of plastic blades is produced. These blades, identified 21 - are then positioned and fixed in the box 1.
  • Each blade is held between the flanges 11 and 12 by a fixing system allowing the separation of the flanges 11 and 12; for example to produce the fixing of the plastic blades, the two flanges 11 and 12 comprise, on the sides corresponding sponding grooves on the outside of the core, the side n ons (or position corresponding to the radial profile of the blades and the blades have raimnres (or tenons) which fit onto the tenons (or in the grooves) of the flanges.
  • the refractory shell 3 is then produced in accordance with the method explained above, the first layer which comes into contact with the internal walls of the box and the added blades being produced with an ethyl silicate slip.
  • the gelation is carried out as explained above.
  • the box is then dismantled so as to extract the shell from the box.
  • the blades 2 are then embedded in the shell ( Figure 5). Cooking is carried out as explained above.
  • FIG. 6 represents the embodiment which corresponds to FIGS. 1 to 4.
  • This monobloc core is composed walls 31 and 32 joined by intermediate partitions 33 in which are formed recesses 34 which open on the outer faces of the two flanges. These recesses 34 correspond to the blades of the rotor.
  • Between the walls 31 and 32 and the partitions 33 are formed internal cavities, in a scroll, which communicate with each other and open outwards through at least one peripheral opening 35 which opens onto the large diameter of the core between the walls 31 and 32. opening debt 35

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Moulds, Cores, Or Mandrels (AREA)
EP82401491A 1981-08-07 1982-08-06 Verfahren zur Herstellung eines keramischen Schalenformteils und so erhaltenes Formteil Expired EP0072329B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82401491T ATE18725T1 (de) 1981-08-07 1982-08-06 Verfahren zur herstellung eines keramischen schalenformteils und so erhaltenes formteil.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8115423A FR2510923B1 (fr) 1981-08-07 1981-08-07 Procede de confection d'un element de moule a carapace ceramique et element de moule obtenu
FR8115423 1981-08-07

Publications (2)

Publication Number Publication Date
EP0072329A1 true EP0072329A1 (de) 1983-02-16
EP0072329B1 EP0072329B1 (de) 1986-03-26

Family

ID=9261313

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401491A Expired EP0072329B1 (de) 1981-08-07 1982-08-06 Verfahren zur Herstellung eines keramischen Schalenformteils und so erhaltenes Formteil

Country Status (4)

Country Link
EP (1) EP0072329B1 (de)
AT (1) ATE18725T1 (de)
DE (1) DE3270113D1 (de)
FR (1) FR2510923B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5159970A (en) * 1989-07-20 1992-11-03 Societe Nationale D'etude Et De Construction De Moteurs D'aviation "S.N.E.C.M.A." Method of making shell moulds for casting

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1071806A (fr) * 1951-12-15 1954-09-06 Ford Procédé de revêtement d'un moule
US2741817A (en) * 1950-08-03 1956-04-17 Universal Castings Corp Heat disposable pattern for molding a blade cavity
GB876805A (en) * 1959-06-11 1961-09-06 Howe Sound Co Improvements in making refractory shell molds
FR1384487A (fr) * 1963-03-14 1965-01-04 Perfectionnements aux moules carapaces pour le moulage de précision
FR2351734A2 (fr) * 1976-05-21 1977-12-16 Trw Inc Moule segmentaire, notamment pour la coulee d'elements de turboreacteurs, et son procede de realisation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2741817A (en) * 1950-08-03 1956-04-17 Universal Castings Corp Heat disposable pattern for molding a blade cavity
FR1071806A (fr) * 1951-12-15 1954-09-06 Ford Procédé de revêtement d'un moule
GB876805A (en) * 1959-06-11 1961-09-06 Howe Sound Co Improvements in making refractory shell molds
FR1384487A (fr) * 1963-03-14 1965-01-04 Perfectionnements aux moules carapaces pour le moulage de précision
FR2351734A2 (fr) * 1976-05-21 1977-12-16 Trw Inc Moule segmentaire, notamment pour la coulee d'elements de turboreacteurs, et son procede de realisation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5159970A (en) * 1989-07-20 1992-11-03 Societe Nationale D'etude Et De Construction De Moteurs D'aviation "S.N.E.C.M.A." Method of making shell moulds for casting

Also Published As

Publication number Publication date
FR2510923B1 (fr) 1986-07-04
FR2510923A1 (fr) 1983-02-11
EP0072329B1 (de) 1986-03-26
ATE18725T1 (de) 1986-04-15
DE3270113D1 (en) 1986-04-30

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