EP1749597A1 - Dispositif et procédé de fabrication de pièces coulées - Google Patents

Dispositif et procédé de fabrication de pièces coulées Download PDF

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Publication number
EP1749597A1
EP1749597A1 EP05016073A EP05016073A EP1749597A1 EP 1749597 A1 EP1749597 A1 EP 1749597A1 EP 05016073 A EP05016073 A EP 05016073A EP 05016073 A EP05016073 A EP 05016073A EP 1749597 A1 EP1749597 A1 EP 1749597A1
Authority
EP
European Patent Office
Prior art keywords
casting
cast body
cavity
mold
tool
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Withdrawn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
EP05016073A
Other languages
German (de)
English (en)
Inventor
Stefan Dr. Irmisch
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to EP05016073A priority Critical patent/EP1749597A1/fr
Publication of EP1749597A1 publication Critical patent/EP1749597A1/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Withdrawn legal-status Critical Current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
    • B22C9/10—Cores; Manufacture or installation of cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/005—Adjustable, sectional, expandable or flexible patterns

Definitions

  • the present invention relates to a casting tool for the production of castings, comprising at least two casting moldings forming a casting mold, which enclose a casting cavity in a parting surface and having inner surfaces arranged on the casting moldings which delimit the casting cavity and whose shape determines the spatial shape of the casting mold Specify cast body. Furthermore, the invention relates to a method for producing a cast body with a generic casting tool.
  • FIG. 1 shows a one-piece cast body 20 which is used as a lost casting core for producing the cooling cavity of a cast gas turbine blade.
  • the cast body 20 is manufactured in a suitable casting device and leaves in a cast gas turbine blade cavities in which flows during operation cooling air for cooling the gas turbine blade.
  • the form elements designated by the reference numeral 22 in FIG. 1 form scoop-side channels, which on the basis of the later-released molded parts 24 merge into cooling channels arranged in the blade profile of the gas turbine blade.
  • the casting tools 30 have at least two casting mold sections 32, 34 which lie against one another in a separating surface 36.
  • the mold sections 32, 34 enclose a casting cavity 38, which may be of any shape.
  • the shape can be, for example, that of a cast body 20 which can be used as a casting core.
  • the section through a casting tool 30 according to FIG. 2 shows a plurality of casting cavities 38a, 38b, 38c which are interconnected in their three-dimensional shape.
  • the selected in Figure 2 section through the casting tool 30 is for example in the cast body 20 shown in Figure 1 at the position marked with the section line II, FIG 1, the mold sections 32, 34 does not show.
  • Each casting section 32, 34 thus has an inner surface 40 which delimit the casting cavity 38 and which predetermine by its shape the spatial shape 42 of the casting 20.
  • the cast parts 32, 34 are to a non-illustrated drive or a drive device straight in the direction of displacement V towards each other to move.
  • the displacement direction V is transverse to the separating surface 36.
  • the two mold sections 32, 34 are moved toward each other until they are in the separation surface 36 together. Subsequently, the casting cavity 38 is filled with a ceramic casting material. After curing of the casting material or the Cast body 20, the mold sections 32, 34 are pulled apart along the direction of displacement V. In this case, the cast body 20 is exposed.
  • FIG. 3 shows a further known embodiment of a casting tool 30 for the production of castings 20.
  • the casting apparatus is shown only partially in FIG.
  • the two mold sections 32, 34 and a third mold section 44 lie in a second separating surface 46 to each other. Due to the partial representation of the casting apparatus 30 in FIG. 3, it is not shown that both a freestanding pin 54 and two further shaped parts of the third casting molding 44 are displaceable as one element.
  • At least one of the two casting sections 32, 34 is displaceable along the displacement direction V.
  • the third casting section 44 is displaceable along a second direction of displacement W in order to expose it in the casting mold 30 after the production of the hardened cast body 20. This allows a series production.
  • the casting tool 30 is shown in a view from below.
  • the third casting molding 44 has two openings or two cavities 50 which are suitable for producing the moldings 22 of the casting 20 (as shown in FIG. 1). Between the two cavities 50 extends a web 52 on which, as FIG 3 shows, the free-standing, in the cavity 38th projecting pin 54 is provided. As well as the two mold sections 32, 34, both the third mold section 44 and the associated pin 54 on inner surfaces 40 which limit the overall casting cavity 38 and predetermine the shape of the space 42 of the casting 20 by their shape.
  • the object is achieved by a casting tool having the features of claim 1.
  • the invention proposes that in a generic casting tool for dissolving out the cast body from the mold after curing of the cast body, at least part of the inner surface resting against the cast body can be removed from it by temporarily changing its shape.
  • the invention proposes that for the production of undercuts in castings, the casting moldings have partial surfaces with geometrically variable shapes. At least one of the mold sections, which lie adjacent to each other enclose the casting cavity, thus has an inner surface which is partially flexible or changeable. With such a casting device or such a casting tool one-piece body can be cast, which, despite exclusively reusable mold sections, can have undercuts. So far, such undercuts were possible only with built cores or with lost cores, which formed a rigid part of the inner surface.
  • the flexible part of the inner surface is returned from a second position to a first position, the starting position, so that the casting molding is then removed from the casting Cast body can be pulled out.
  • the desired spatial form of the casting remains intact.
  • the invention allows the production of castings branched along the direction of movement of the relevant casting section and thus transversely to the separating surface.
  • undercuts can also be produced in a region of the cast body without having to rework the cast body to be produced.
  • the advantage of this invention is thus in the time and cost savings, since the complex composition of castings with background eliminates.
  • One-piece castings with extremely complex geometries in mass production can be produced with exclusively reusable cast iron parts.
  • the casting tool has an inner surface with the variable part, wherein the variable part is variable relative to the remaining, rigid part of the inner surface of a first position to a second position.
  • the changeable part of the inner surface predetermines the spatial form of the cast body, whereas in the first position the cast mold part can be detached from the cast body.
  • the variable portion of the inner surface is in the first position, the associated mold portion has a smaller volume than that stored in the second position.
  • the casting tool has a third casting molding which can be placed against the first casting molding in a second parting surface, the second parting surface being transverse, preferably perpendicular, to the first parting surface.
  • the variable part of the inner surface may be provided on the first casting molding and / or on the second casting molding and / or on the third casting molding.
  • undercuts and / or branches in the cast body is advantageously achieved by the displacement of the variable part from the first position to the second position, when the extension direction of the variable part is approximately parallel - and not perpendicular - to the interface.
  • undercuts in castings with the casting tool according to the invention can also be achieved when the undercut and / or branch cross to the parting surface of the relevant casting section, ie extends in the direction of movement.
  • variable part of the inner surface of a movable Membrane formed is available at low cost.
  • connection of a membrane to the rigid part of the inner surface is comparatively easy to accomplish.
  • variable part of the inner surface or the membrane is movable by means of a pneumatic, hydraulic or electric-mechanical drive.
  • the design of the casting tool wherein at least one of the casting mold sections has a cavity which is separated from the casting cavity by the movable membrane.
  • the membrane can be relocated from the second position into the cavity to the first position.
  • the cavity is a gaseous or liquid, the flexible part moving medium on or away from this.
  • the flexible part is created so that it has a preferred spatial distribution (shape) or shape that automatically produces without external influences and thereby corresponds to the second position.
  • shape shape
  • the space distribution provides the requisite stiffness of the variable portion needed during filling of the casting cavity with casting material, such as viscous ceramics, so that the gas material does not alter the casting shape during this time.
  • the flexible part Only by applying a minimum force which is greater than the filling pressure of the casting material, the flexible part is displaced from the second position to the first position.
  • This minimum force can be transmitted by a gaseous or liquid medium or by a pneumatic, hydraulic or electric drive to the moving part.
  • the cavity present in the mold part, into which the movable membrane can be moved back to release the cast body is filled with a liquid.
  • the movable part of the inner surface can be displaced from the second position to the first position, whereby the associated casting mold piece can be released from the cast body.
  • a supply line for air is provided, which opens at the flexible part, so that when the flexible part is removed from the cast body, no negative pressure or vacuum arises at this point.
  • the cavity could also be pressurized with a gas which moves the variable portion to the second position. Also conceivable would be a mechanism that moves the moving part from the second position to the first position and vice versa.
  • FIG. 5 shows a casting tool 60 according to the invention with three casting mold sections 32, 34, 45 for producing cast bodies 20.
  • the cast mold sections 32, 34, 45 form a casting mold 61. With their inner surfaces 40, they form the casting cavity 38, delimit it and give it its shape the space shape 42 of the cast body 20 to be produced.
  • the variable portion 62 is provided only at the free end 66 of the pin 54, which is part of the third Gußformteil institutions 45.
  • the inner surface 40 in the region of the free end 66 of the peg 54 can have a slender shape 64 as the first position 71.
  • the changeable part 62 of the inner surface 40 is formed by a movable, impermeable, optionally also expandable membrane 63.
  • the membrane 63 can be moved in the direction of movement B by a pneumatic, hydraulic or electric drive.
  • the partially hollow pin 54 has a cavity 65 which is partially separated from the casting cavity 38 by the membrane 63. To move the membrane 63, the cavity 65 is a liquid medium 67 to and from these discharged.
  • the desired spatial form 42 of the cast body 20 to be produced is defined at the free end 66 of the pin 54 by the solid-line balloon-like shape 68 into which the membrane 63 can be moved.
  • the mold sections 32, 34, 45 are moved toward each other until they abut each other in their operating position.
  • cast material 73 is supplied from the outside to the casting cavity 38 or injected into it through one or more channels 75 until it is completely filled with casting material 73. Thereafter, the cast material 73 hardens and leaves the one-piece casting 20 with the desired spatial shape 42.
  • the space shape 42 is determined by the shape of the casting cavity 38 and thus by the structure of the inner surfaces 40.
  • the inner surface 40 may comprise structural elements with which contours can be produced on the surface of the cast body 20 which, when using the cast body 20 as a cast core in a device for casting turbine blades, in this turbine blade generates on the inner wall of the cooling channel, the cooling air influencing agent, such as turbulators, base fields and / or the like.
  • the third mold section 45 may initially be provided not be pulled out of this.
  • the expansion 70 is hooked to the cast body 20. Due to the movable diaphragm 63 at the free end 66 of the pin 54, the shape of the inner surface 40 in this area can be changed from the second position 72 to the first position 71.
  • the third casting section 45 can be pulled out of the casting 20.
  • the membrane 63 is thus temporarily changed into the slimmer shape 64, whereby the entanglement of the pin 54 and thus of the casting section 45 is solved with the cast body 20.
  • the inner surface 40 applied to the cast body 20 is spaced from the cast body 20 with a temporary change in its shape, ie removed. Thereafter, the casting molding 45 is used from the casting 20.
  • this method is not limited to the embodiment. This serves only as an explanation of the method and the casting tool. It can also be transferred to other areas and applications.
  • variable portion of the inner surface having casting section is reusable multiple times.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP05016073A 2005-07-25 2005-07-25 Dispositif et procédé de fabrication de pièces coulées Withdrawn EP1749597A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05016073A EP1749597A1 (fr) 2005-07-25 2005-07-25 Dispositif et procédé de fabrication de pièces coulées

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05016073A EP1749597A1 (fr) 2005-07-25 2005-07-25 Dispositif et procédé de fabrication de pièces coulées

Publications (1)

Publication Number Publication Date
EP1749597A1 true EP1749597A1 (fr) 2007-02-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP05016073A Withdrawn EP1749597A1 (fr) 2005-07-25 2005-07-25 Dispositif et procédé de fabrication de pièces coulées

Country Status (1)

Country Link
EP (1) EP1749597A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012000636A1 (fr) * 2010-06-30 2012-01-05 Voith Patent Gmbh Stator et procédé de production d'un stator
WO2022161754A1 (fr) * 2021-01-26 2022-08-04 Basf Polyurethanes Gmbh Pièce coulée plus grande que le moule de coulée

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2968846A (en) * 1958-03-05 1961-01-24 Osborn Mfg Co Foundry molding machine
FR2427150A1 (fr) * 1978-06-02 1979-12-28 Sambre Acierie Fonderie Haute Procede de moulage et matrice pour sa mise en oeuvre
JPS59120344A (ja) * 1982-12-28 1984-07-11 Fujikin:Kk 金属製または合成樹脂製中空物のキヤステイング方法およびキヤステイング用中子
GB2183516A (en) * 1985-11-30 1987-06-10 Ford Motor Co Pressure diecasting cores

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2968846A (en) * 1958-03-05 1961-01-24 Osborn Mfg Co Foundry molding machine
FR2427150A1 (fr) * 1978-06-02 1979-12-28 Sambre Acierie Fonderie Haute Procede de moulage et matrice pour sa mise en oeuvre
JPS59120344A (ja) * 1982-12-28 1984-07-11 Fujikin:Kk 金属製または合成樹脂製中空物のキヤステイング方法およびキヤステイング用中子
GB2183516A (en) * 1985-11-30 1987-06-10 Ford Motor Co Pressure diecasting cores

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 240 (M - 336) 6 November 1984 (1984-11-06) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012000636A1 (fr) * 2010-06-30 2012-01-05 Voith Patent Gmbh Stator et procédé de production d'un stator
WO2022161754A1 (fr) * 2021-01-26 2022-08-04 Basf Polyurethanes Gmbh Pièce coulée plus grande que le moule de coulée

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