GB1327992A - Mould assembly for cocoon casting of directionally solidified articles - Google Patents

Mould assembly for cocoon casting of directionally solidified articles

Info

Publication number
GB1327992A
GB1327992A GB1314571*[A GB1314571A GB1327992A GB 1327992 A GB1327992 A GB 1327992A GB 1314571 A GB1314571 A GB 1314571A GB 1327992 A GB1327992 A GB 1327992A
Authority
GB
United Kingdom
Prior art keywords
article
cavity
cavities
crystal growth
mould
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
GB1314571*[A
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.)
Raytheon Technologies Corp
Original Assignee
United Aircraft Corp
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 United Aircraft Corp filed Critical United Aircraft Corp
Publication of GB1327992A publication Critical patent/GB1327992A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B11/00—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method
    • C30B11/002—Crucibles or containers for supporting the melt
    • 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
    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B11/00—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method
    • C30B11/14—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method characterised by the seed, e.g. its crystallographic orientation
    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
    • C30B29/10—Inorganic compounds or compositions
    • C30B29/52—Alloys

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Abstract

1327992 Casting and foundry moulding processes UNITED AIRCRAFT CORP 5 May 1971 [1 June 1970] 13145/71 Heading B3F A mould for producing directionally solidified cast articles includes a first mould portion 4 having an article (turbine blade) forming cavity 5, 8, 10, 12 and beneath this cavity a columnar crystal growth starting cavity 14 having an open bottom. A second mould portion 2 (see Fig. 10) surrounds the first poition 4 to define a pair of cavities 18 (see Fig. 7) at opposed sides of the article-forming cavity 5. The cavities 18 are connected towards the base of the mould where they surround and may open into the open bottom of the crystal growth starting cavity 14. A chill plate 3 closes the base of the cavity formed by the second mould portion 2 about the article and crystal growth starting cavities. In operation, the mould is preheated and molten alloy poured in a vacuum through a sprue 47 into the cavities 18. The molten alloy enters the article-forming cavity 5 through the columnar crystal growth starting cavity 14. Alternatively, the alloy can be poured into article-forming cavity 5 and from there enter cavities 18. Upward solidification is induced from the chill plate, the helical part of the crystal growth starting cavity 14 selecting a single crystal to grow into the article-forming cavity 5. In an alternative embodiment, the article-forming cavity is not interconnected with outer cavities 18, and consequently the crystal growth starting portion (42) is extended downwardly so that its open bottom is closed by a chill plate (36). In this embodiment a cheaper alloy may be poured into the cavities 18 and may be used to surround the article formed. To separate the cast article from the sheath cast about it in cavities 18 and the crystal growth casting portions, a single saw cut is made across the base of the article just below a line 13. Moulding processes.-To form the mould a wax pattern of the article, crystal growth cavity and sprue is first invested to form a first shell mould portion 4. A wax overlay is then provided on the first portion 4 to form the cavities 18 and their extension (19) that surrounds the crystal growth cavity. The assembly of patterns and first portion 4 is once again iuvested to form a second shell portion 2 and the wax patterns melted out.
GB1314571*[A 1970-06-01 1971-05-05 Mould assembly for cocoon casting of directionally solidified articles Expired GB1327992A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US4242370A 1970-06-01 1970-06-01

Publications (1)

Publication Number Publication Date
GB1327992A true GB1327992A (en) 1973-08-22

Family

ID=21921855

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1314571*[A Expired GB1327992A (en) 1970-06-01 1971-05-05 Mould assembly for cocoon casting of directionally solidified articles

Country Status (7)

Country Link
US (1) US3627015A (en)
AU (1) AU2851371A (en)
BE (1) BE767835A (en)
DE (1) DE2124773A1 (en)
FR (1) FR2093971A1 (en)
GB (1) GB1327992A (en)
IL (1) IL36755A0 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2259660A (en) * 1991-09-17 1993-03-24 Rolls Royce Plc A mould for casting components
GB2260284A (en) * 1991-10-09 1993-04-14 Rolls Royce Plc A mould for casting components
US5234047A (en) * 1991-10-09 1993-08-10 Rolls-Royce Plc Mould for casting components

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3680625A (en) * 1970-11-12 1972-08-01 Trw Inc Heat reflector
US3739835A (en) * 1971-12-01 1973-06-19 United Aircraft Corp Process of making shell molds
US3965963A (en) * 1973-11-16 1976-06-29 United Technologies Corporation Mold and process for casting high temperature alloys
US3927710A (en) * 1974-08-21 1975-12-23 United Technologies Corp Joining of multi-section ceramic molds
US3981344A (en) * 1974-08-21 1976-09-21 United Technologies Corporation Investment casting mold and process
GB2028928B (en) * 1978-08-17 1982-08-25 Ross Royce Ltd Aerofoil blade for a gas turbine engine
US4180119A (en) * 1978-09-18 1979-12-25 Howmet Turbine Components Corporation Mold for directionally solidified single crystal castings and method for preparing same
US4475582A (en) * 1982-01-27 1984-10-09 United Technologies Corporation Casting a metal single crystal article using a seed crystal and a helix
FR2664187B1 (en) * 1990-07-04 1992-09-18 Snecma FOUNDRY MOLD FOR THE MANUFACTURE OF PARTS BY SINGLE CRYSTAL SOLIDIFICATION.
US5273708A (en) * 1992-06-23 1993-12-28 Howmet Corporation Method of making a dual alloy article
DE10024302A1 (en) 2000-05-17 2001-11-22 Alstom Power Nv Process for producing a thermally stressed casting
US7334995B2 (en) * 2005-11-22 2008-02-26 Siemens Power Generation, Inc. Turbine blade assembly and method of manufacture
CN102794402B (en) * 2012-08-21 2014-07-16 沈阳黎明航空发动机(集团)有限责任公司 Profiling die of single crystal blade spiral crystal selector
US9855599B2 (en) 2015-11-15 2018-01-02 General Electric Company Casting methods and articles

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2259660A (en) * 1991-09-17 1993-03-24 Rolls Royce Plc A mould for casting components
GB2260284A (en) * 1991-10-09 1993-04-14 Rolls Royce Plc A mould for casting components
US5234047A (en) * 1991-10-09 1993-08-10 Rolls-Royce Plc Mould for casting components
GB2260284B (en) * 1991-10-09 1995-05-31 Rolls Royce Plc A mould for casting components

Also Published As

Publication number Publication date
IL36755A0 (en) 1971-07-28
AU2851371A (en) 1972-11-09
FR2093971A1 (en) 1972-02-04
DE2124773A1 (en) 1971-12-16
BE767835A (en) 1971-10-18
US3627015A (en) 1971-12-14

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed