EP0603738A1 - Dispositif pour la solidification directionelle de métaux en fusion - Google Patents

Dispositif pour la solidification directionelle de métaux en fusion Download PDF

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Publication number
EP0603738A1
EP0603738A1 EP93120256A EP93120256A EP0603738A1 EP 0603738 A1 EP0603738 A1 EP 0603738A1 EP 93120256 A EP93120256 A EP 93120256A EP 93120256 A EP93120256 A EP 93120256A EP 0603738 A1 EP0603738 A1 EP 0603738A1
Authority
EP
European Patent Office
Prior art keywords
heat
molded shell
insulation block
outer ribs
opening
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
EP93120256A
Other languages
German (de)
English (en)
Other versions
EP0603738B1 (fr
Inventor
Wolfgang Dr. Betz
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.)
MTU Aero Engines GmbH
Original Assignee
MTU Motoren und Turbinen Union Muenchen GmbH
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 MTU Motoren und Turbinen Union Muenchen GmbH filed Critical MTU Motoren und Turbinen Union Muenchen GmbH
Publication of EP0603738A1 publication Critical patent/EP0603738A1/fr
Application granted granted Critical
Publication of EP0603738B1 publication Critical patent/EP0603738B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B22D27/045—Directionally solidified castings

Definitions

  • the invention relates to a device for the directional solidification of molten material in a molded shell, which has different cross sections over its length and is movable relative to a heat source.
  • the highest possible temperature gradient on the solidification front is required.
  • a heat source is placed as close as possible above a heat sink.
  • a solidification front forms between the two in the molded shell when the molded shell is moved from the hot area of influence of the heat source into the cold area of a heat sink.
  • the heat source radiates from all directions onto the molded shell to be heated with melting material and, depending on the shape of the molded shell, has more or less visual contact with the heat sink.
  • a disadvantage of these devices is that the geometry of the solidification front in the molded shell when the melt material is removed from the Area of influence of the heat source in the case of molded shells which have different cross sections in length, so that they are not prismatic, cannot be stabilized. This is associated with the risk that the desired columnar or single crystal structure will not be achieved in the directional solidification.
  • Another disadvantage is that with the partial visual contact between the heat source and the heat sink, the temperature gradient in the area of the solidification front is reduced.
  • the object of the invention is to provide a generic device with which an improved guidance of the heat flow in the case of directed solidification is achieved and a high temperature gradient in the area of the solidification front is maintained regardless of the shape of the molded shell.
  • a heat insulation block is arranged between the heat source and a heat sink, which has an opening for driving through the molded shell, the molded shell having outer ribs, which are arranged orthogonally to the direction of movement and are adapted in their outer contour to the opening of the insulation block.
  • An advantage of this device is that an insulation path is built up in the direction of movement through the heat insulation block, in which the solidification front is formed. The closer the heat insulation block can be brought to the molded shell, the more stable the geometry of the solidification front. If the geometry of the solidification front is stable, the directional solidification of the melt material in the columnar structure or single crystallinity remains more stable.
  • the heat insulation block can only be optimally adapted to the largest cross section of the molded shell, or the opening in the heat insulation block would have to constantly follow the shape of the molded shell when passing through the molded shell, which would be associated with a high technical outlay.
  • This technically high effort is advantageously avoided by the outer ribs which are arranged orthogonally to the direction of movement and whose outer contour is adapted to the opening of the heat insulation block.
  • the outer ribs of the molded shell have the advantage that the direct visual contact between the heat source and the heat sink is interrupted without hindering the heat flow into or out of the mold.
  • the concentration of the heat flow on the casting material is improved by the outer ribs, so that the energy consumption of the device in the case of directional solidification is additionally reduced.
  • the outer ribs consist of thermal insulation material. This has the advantage that no heat is removed from the molded shell in the area of action of the outer ribs and thus the outer ribs do not act as local heat sinks and disrupt the heat flow within the molded shell.
  • Preferred materials are zirconium oxide or aluminum oxide.
  • the outer ribs have a thickness that ensures their dimensional stability and aligns the heat radiation path between a boiler room wall and the wall of the molded shell orthogonally to the direction of movement, and does not hinder this heat radiation path and at the same time interrupts the heat radiation path between the heat source and heat sink.
  • the outer ribs therefore have a small thickness, which is between 0.1 and 5 mm.
  • the outer fins are preferably made of a material with anisotropic heat conduction, the heat conduction in the direction of movement is less than orthogonal to the direction of movement. This prevents heat radiation on molded shell parts in the area of influence of the heat sink and the heat coupling between the heat source and molded shell and molded shell and heat sink is not impaired by the outer ribs.
  • Graphite layers, mica sheets or asbestos substitutes are preferably used as the material with anisotropic heat conduction.
  • the directional effect of the outer fins for the heat radiation from a boiler room wall to the molded shell and vice versa is advantageously increased in that the outer fins have a heat-reflecting coating.
  • This is preferably a metallic coating made of noble metals or of a chromium, aluminum, nickel, cobalt or iron-based alloy.
  • the extension of the heat insulation block in the direction of movement of the molded shell is preferably between 5 and 50 mm in systems for the single-crystal growth of engine blades.
  • the distance between the outer ribs is at most equal to the extent of the heat insulation block in the direction of movement. This has the advantage that in any solidification position of the molded shell, at least one outer rib prevents direct heat radiation (visual contact) between the heat source and the heat sink.
  • the distance between the outer ribs is preferably ensured by thin rods which are arranged between the ribs.
  • the outer ribs can be halved and thus enclose the molded shell in a simple manner. With the spacing bars, the outer ribs can be connected to form an integral component. This has the advantage that this component made of outer ribs and bars can be used several times.
  • the outer ribs can preferably surround the molded shell in a form-fitting manner and thus advantageously contribute to the dimensional stability of the molded shell.
  • the molded shell can be made thinner than before, so that a higher heat coupling between the heat source, molded shell and melt on the one hand and solidified material, molded shell and heat sink on the other hand is possible.
  • the outer ribs are preferably molded or glued to the molded shell. This has the advantage that the molded shell forms an integral component with the outer ribs and spacing rods or other aids are not required, and molded shell and outer ribs can be moved as a thermal unit through the opening of the insulation block.
  • the device has a boiler room with an internal hollow cross-section, the contour of which corresponds to the opening of the heat insulation block and is arranged in alignment therewith.
  • the boiler room preferably has inner ribs.
  • the inner ribs have openings that correspond to the opening of the heat insulation block and are aligned with it. With the help of these inner ribs and the outer ribs of the molded shell, the heat exchange between the boiler room wall and molded shell is improved.
  • the 1 shows a device 1 for the directional solidification of molten material 2 with a heat insulation block 3 and adapted outer ribs 4 of a molded shell 5.
  • the molded shell 5 has different cross sections 6, 7, 8, 9 over its length and is relative to a heat source 10 in Direction of arrow A moves.
  • the heat insulation block 3 is arranged between the heat source 10 and a heat sink 11 and has an opening 12 through which the mold shell 5 is moved in the direction A.
  • a solidification front 13 for the melting material 2 is formed in the thermal influence area of the heat insulation block 3.
  • This solidification front 13 must be kept stable by an appropriate temperature profile over the length of the molded shell.
  • the temperature profile that forms in the melt material 2 and a component section 14 that has already solidified in a directed manner can only be actively and stably maintained from the outside via the heat source 10, insulation block 3 and heat sink 11 if there is trouble-free heat coupling between the molded shell and the heat source 10, heat insulation block 3 and Heat sink 11 is secured.
  • the molded shell 5 is used to produce a single-crystal directionally solidified engine blade made of a Ni or Co-based alloy with a blade length of 200 mm, an average blade depth of 5 mm, an average blade width of 30 mm and shroud segment dimensions of 25x35 mm2 and blade root dimensions of 17x35 mm2 .
  • the insulation block 3 in this example has a thickness of 15 mm and the opening 12 is adapted to the largest dimensions of the outer contour of the molded shell 5, so that they are moved with their sprayed-on outer ribs 4 with a thickness of 1.5 mm 2 through the opening 12 in direction A. can.
  • FIG. 2 shows a device 1 for the directional solidification of melting material 2 with a heating chamber 15 and adapted inner 16 and outer ribs 4.
  • the heating chamber 15 is closed at the top by a cover 17.
  • the inner ribs 16 are arranged orthogonally to the direction of movement (arrow direction A) and have openings 18 which correspond to the opening 12 of the heat insulation block 3 and are aligned with it. With these inner fins 16, the heating chamber is reduced to the dimensions of the opening 12 and intensive heat coupling between the molded shell 5 with outer fins 4 on the one hand and heat source 10, heat insulation block 3 and heat sink 11 on the other hand is achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
EP19930120256 1992-12-18 1993-12-16 Dispositif pour la solidification directionelle de métaux en fusion Expired - Lifetime EP0603738B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4242852 1992-12-18
DE19924242852 DE4242852C2 (de) 1992-12-18 1992-12-18 Vorrichtung zur gerichteten Erstarrung von Schmelzgut

Publications (2)

Publication Number Publication Date
EP0603738A1 true EP0603738A1 (fr) 1994-06-29
EP0603738B1 EP0603738B1 (fr) 1997-05-07

Family

ID=6475684

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930120256 Expired - Lifetime EP0603738B1 (fr) 1992-12-18 1993-12-16 Dispositif pour la solidification directionelle de métaux en fusion

Country Status (2)

Country Link
EP (1) EP0603738B1 (fr)
DE (1) DE4242852C2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2309405A (en) * 1996-01-25 1997-07-30 Ald Vacuum Techn Gmbh Casting and directional solidification using a heat sink
WO2000056482A1 (fr) * 1999-03-22 2000-09-28 Asarco Incorporated Moulage en cuivre de haute purete exempt d'oxygene
FR2874340A1 (fr) * 2004-08-20 2006-02-24 Snecma Moteurs Sa Procede de fonderie de pieces en carapace, grappe et carapace pour sa mise en oeuvre, aube de turboreacteur obtenue par un tel procede, et moteur d'aeronef comportant de telles aubes

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10047397B4 (de) * 2000-09-26 2004-02-05 Ald Vacuum Technologies Ag Vorrichtung zum Schmelzen und gerichteten Erstarren eines Metalls
DE102007014744A1 (de) * 2007-03-28 2008-10-02 Rwth Aachen Form und Verfahren zur gießtechnischen Herstellung eines Gusstücks

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60195082A (ja) * 1984-03-16 1985-10-03 Fujitsu Ltd 半導体結晶の製造装置
EP0465721A2 (fr) * 1990-07-13 1992-01-15 Leybold Aktiengesellschaft Four de fusion et coulée

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4108236A (en) * 1977-04-21 1978-08-22 United Technologies Corporation Floating heat insulating baffle for directional solidification apparatus utilizing liquid coolant bath
US4969501A (en) * 1989-11-09 1990-11-13 Pcc Airfoils, Inc. Method and apparatus for use during casting

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60195082A (ja) * 1984-03-16 1985-10-03 Fujitsu Ltd 半導体結晶の製造装置
EP0465721A2 (fr) * 1990-07-13 1992-01-15 Leybold Aktiengesellschaft Four de fusion et coulée

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 49 (C - 330)<2106> 26 February 1986 (1986-02-26) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2309405A (en) * 1996-01-25 1997-07-30 Ald Vacuum Techn Gmbh Casting and directional solidification using a heat sink
US5778961A (en) * 1996-01-25 1998-07-14 Ald Vacuum Technologies Gmbh Process and device for simultaneous casting and directional solidification of several castings
GB2309405B (en) * 1996-01-25 1999-03-24 Ald Vacuum Techn Gmbh Process and device for simultaneous casting and directional solidification of several castings
WO2000056482A1 (fr) * 1999-03-22 2000-09-28 Asarco Incorporated Moulage en cuivre de haute purete exempt d'oxygene
US6192969B1 (en) * 1999-03-22 2001-02-27 Asarco Incorporated Casting of high purity oxygen free copper
FR2874340A1 (fr) * 2004-08-20 2006-02-24 Snecma Moteurs Sa Procede de fonderie de pieces en carapace, grappe et carapace pour sa mise en oeuvre, aube de turboreacteur obtenue par un tel procede, et moteur d'aeronef comportant de telles aubes

Also Published As

Publication number Publication date
EP0603738B1 (fr) 1997-05-07
DE4242852A1 (de) 1994-06-23
DE4242852C2 (de) 1995-06-29

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