EP0084234A1 - Feingiessverfahren und Form - Google Patents

Feingiessverfahren und Form Download PDF

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Publication number
EP0084234A1
EP0084234A1 EP82306628A EP82306628A EP0084234A1 EP 0084234 A1 EP0084234 A1 EP 0084234A1 EP 82306628 A EP82306628 A EP 82306628A EP 82306628 A EP82306628 A EP 82306628A EP 0084234 A1 EP0084234 A1 EP 0084234A1
Authority
EP
European Patent Office
Prior art keywords
mould
chaplet
core
pattern
outer part
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Withdrawn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
EP82306628A
Other languages
English (en)
French (fr)
Inventor
George Alan Whittaker
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.)
Vinters Ltd
Original Assignee
Vickers PLC
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 Vickers PLC filed Critical Vickers PLC
Publication of EP0084234A1 publication Critical patent/EP0084234A1/de
Withdrawn legal-status Critical Current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
    • B22C9/06—Permanent moulds for shaped castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C21/00—Flasks; Accessories therefor
    • B22C21/12—Accessories
    • B22C21/14—Accessories for reinforcing or securing moulding materials or cores, e.g. gaggers, chaplets, pins, bars
    • 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
    • B22C7/02—Lost patterns
    • 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 investment casting and to an investment casting mould.
  • the invention specifically concerns a mould comprising an outer part surrounding an inner core.
  • This type of mould is well known and is used for the casting of hollow parts such as, for example, turbine blades and guide vanes for jet propulsion engines.
  • the core is usually held in position at its extremities within the outer part of the mould by means of supports known as prints extending between the outer part and the core. If the cores are very slender, further supports at intermediate positions may be necessary.
  • These supports are called chaplets and their construction and method of insertion into the mould affects not only the moulding process itself but also the finished moulded article.
  • Such chaplets more usually constructed of two discs joined by a cylinder, have been extensively used in sand casting moulds for many years.
  • An existing form of chaplets as used in shell moulds consists of a pin or wire.
  • the pin or wire form chaplet is pushed into the wax until it contacts the core.
  • the length of the pins or wires is chosen so that they project slightly from the wax after insertion and locate in the outer part of the mould which is subsequently formed about them.
  • a method of investment casting using an investment casting block mould having a core including the steps of forming a pattern about the core of the mould, inserting the chaplets into the pattern until they engage the core, forming the outer part of the mould about the pattern, removing the pattern, pouring molten metal into the cavity left thereby to produce a casting into which the material of the chaplets is fused, allowing the molten metal to solidify and removing the outer part and core of the block mould.
  • a method of investment casting using an investment casting mould having a core including the steps of forming a pattern about the core of the mould, forming chaplets from sheets of expanded metal, inserting the chaplets into the pattern until they engage the core, forming the outer part of the mould about the pattern, removing the pattern, pouring molten metal into the cavity left thereby to produce a casting into which the material of the expanded metal chaplets is fused, allowing the molten metal to solidify, and removing the outer part and core of the mould.
  • a preferred embodiment of the method of the invention may comprise one or more of the following advantageous features:-
  • an investment casting block mould comprising a core, a mould outer part disposed around and spaced from the core and chaplets extending between the outer part and the core and locating the core within the outer mould part.
  • an investment casting mould comprising a core, a mould outer part disposed around and spaced from the core, and chaplets made of expanded metal extending between the outer part and the core and locating the core within the outer mould part.
  • a preferred embodiment of the mould of the invention may comprise one or more of the following advantageous features:-
  • the invention also comprises a casting made by the above defined mould and method.
  • the mould to be used effectively comprises two parts, an outer part 1 and a core 2.
  • the core which is made of ceramic and has an external surface complementary in form to the desired form of the internal surface of the vane, is placed in a pattern die.
  • the core is supported in the die by means of prints 5 which extend from the extremities of the core.
  • the material for making the pattern 6, normally a low melting point substance such as wax or synthetic plastics alternative such as polystyrene, is then injected into the die and allowed to solidify ( Figure 1). Thereafter, the die is opened leaving the ceramic core 2 with the pattern 6 formed on it.
  • Metal chaplets 7 are then inserted into the material of the pattern 6 ( Figure 2) until they abutt the surface of the cermic core 2 beneath leaving portions 8 thereof projecting from the pattern 6.
  • the metal from which the chaplet is constructed must have good resistance to oxidation in mould firing furnace atmospheres. Examnles of such metals are, platinum, combinations of nickel cobalt and chromium alloys, or such dense metal alloys coated with platinum or other metal of superior oxidation resistance.
  • each chaplet is usually heated to a temperature above the melting point of the pattern material.
  • Each chaplet 7 is made of expanded metal sheet and several examples of.expanded metal sheet felt tobe suitable are illustrated in Figure 5.
  • expanded metal sheet are made by Expamet Industrial Products Limited of 16 Caxton Street, London, SWlH ORA.
  • the expanded metal is made by producing a plurality of slits in a metal sheet and then stretching the sheet to form a mesh.
  • a chaplet made of this material affords a more rigid support distributed over a greater area than a single unexpanded piece of material. This enables less material to be used for a given support requirement, a factor of considerable importance when the chaplets are made of a precious metal such as platinum.
  • each chaplet 7 consists of a sheet of expanded metal having cross-sectional dimensions of approximately 0.015" x 0.040" and a length to enable it to project approximately 0.20" out of the wax pattern to enable ready keying with the mould material of the outer mould part.
  • the apertured nature of the expanded metal material affords ready access to a greater bulk of the material of the chaplet 7 and this promotes fusion of the chaplet with the poured metal in the casting or pouring step itself.
  • the pattern is dip coated and stuccoed.
  • an extremely fine ceramic coating known as a pre-coat;is applied as a slurry directly to the surface of the pattern 6 to reproduce maximum surface smoothness in the casting.
  • the slurry is stuccoed with fine refract- .ory particles and may be made more impermeable to molten metal by the addition of one or even two additional coats.
  • This coated pattern is then surrounded in a block or flask mould by coarser, cheaper and more permeable investment to form the mould.
  • the projecting portions 8 of the chaplets 7 locate in the outer part of the mould 9 so formed (see Figure 3).
  • the pattern of low melting point material is melted and drained out of the mould which is then heated to a temperature of the order of 1050°C.
  • the molten metal 10 is then poured into the cavity left by the melted pattern.
  • the material of the chaplets 7 is distributed into the mass of the molten material (see Figure 4). After allowing the molten material to solidify and cool, the outer part of the mould is broken away from the mould and the core 2 of the mould is disolved and removed.
  • expanded metal chaplets may also readily be applied to the shell mould process.
  • several coarser coats are applied, also by dipping and stuccoing, in order to build up a shell strong enough to support the poured metal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Mold Materials And Core Materials (AREA)
EP82306628A 1981-12-16 1982-12-13 Feingiessverfahren und Form Withdrawn EP0084234A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8137945 1981-12-16
GB8137945 1981-12-16

Publications (1)

Publication Number Publication Date
EP0084234A1 true EP0084234A1 (de) 1983-07-27

Family

ID=10526656

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82306628A Withdrawn EP0084234A1 (de) 1981-12-16 1982-12-13 Feingiessverfahren und Form

Country Status (2)

Country Link
EP (1) EP0084234A1 (de)
GB (1) GB2111881A (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2580967A1 (fr) * 1985-04-25 1986-10-31 Trw Inc Procede pour fabriquer un element composant de turbomachine et element ainsi obtenu
FR2616091A1 (fr) * 1987-06-03 1988-12-09 Rolls Royce Plc Methode de fabrication et article ainsi fabrique
EP0324229A2 (de) * 1988-01-13 1989-07-19 ROLLS-ROYCE plc Vorrichtung zum Abstützen eines Kernes in einer Form
EP0533385A1 (de) * 1991-09-20 1993-03-24 Johnson Matthey Public Limited Company Draht für Kernstütze
EP1053804A1 (de) * 1999-05-20 2000-11-22 Asea Brown Boveri AG Kernstütze
EP1053805A1 (de) * 1999-05-20 2000-11-22 Asea Brown Boveri AG Halteelement
EP1524046A1 (de) * 2003-10-15 2005-04-20 United Technologies Corporation Refraktärmetallkern
EP1531019A1 (de) * 2003-10-16 2005-05-18 United Technologies Corporation Refraktärmetallkern
FR2874186A1 (fr) * 2004-08-12 2006-02-17 Snecma Moteurs Sa Procede de fabrication par moulage a cire perdue de pieces comportant au moins une cavite.
US7032642B2 (en) 2002-11-14 2006-04-25 Rolls-Royce Plc Investment moulding process and apparatus
GB2426730B (en) * 2004-02-27 2008-04-09 Shilling Ind Technologies And Investment casting pins
CN102139355A (zh) * 2011-03-15 2011-08-03 中核苏阀横店机械有限公司 一种定位芯撑
WO2012052665A1 (fr) * 2010-10-19 2012-04-26 Snecma Moule d'injection pour modele en cire d'une aube de turbine a support du noyau isostatique
CN104923722A (zh) * 2015-06-24 2015-09-23 西安航空动力股份有限公司 空心导向叶片上缘板型腔壁厚的控制方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10245658A (ja) * 1997-03-05 1998-09-14 Mitsubishi Heavy Ind Ltd 高Ｃｒ精密鋳造材及びタービン翼
US7172012B1 (en) * 2004-07-14 2007-02-06 United Technologies Corporation Investment casting
CN106002112B (zh) * 2016-05-31 2017-11-28 西北工业大学 涡轮叶片陶芯软芯撑加工方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1917476U (de) * 1961-05-03 1965-06-10 Howe Sound Co Giessmodell, insbesondere zur herstellung von turbinenschaufeln fuer den antrieb von luftfahrzeugen.
DE2536751A1 (de) * 1974-08-21 1976-03-04 United Technologies Corp Verfahren zur herstellung einer praezisionsgussform und die dabei erhaltene form
GB2053757A (en) * 1979-07-19 1981-02-11 Rolls Royce Lost wax patterns
US4283835A (en) * 1980-04-02 1981-08-18 United Technologies Corporation Cambered core positioning for injection molding

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1917476U (de) * 1961-05-03 1965-06-10 Howe Sound Co Giessmodell, insbesondere zur herstellung von turbinenschaufeln fuer den antrieb von luftfahrzeugen.
DE2536751A1 (de) * 1974-08-21 1976-03-04 United Technologies Corp Verfahren zur herstellung einer praezisionsgussform und die dabei erhaltene form
US3981344A (en) * 1974-08-21 1976-09-21 United Technologies Corporation Investment casting mold and process
GB2053757A (en) * 1979-07-19 1981-02-11 Rolls Royce Lost wax patterns
US4283835A (en) * 1980-04-02 1981-08-18 United Technologies Corporation Cambered core positioning for injection molding

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2580967A1 (fr) * 1985-04-25 1986-10-31 Trw Inc Procede pour fabriquer un element composant de turbomachine et element ainsi obtenu
FR2616091A1 (fr) * 1987-06-03 1988-12-09 Rolls Royce Plc Methode de fabrication et article ainsi fabrique
EP0324229A2 (de) * 1988-01-13 1989-07-19 ROLLS-ROYCE plc Vorrichtung zum Abstützen eines Kernes in einer Form
EP0324229A3 (en) * 1988-01-13 1990-07-25 Rolls-Royce Plc Method of supporting a core in a mould
EP0533385A1 (de) * 1991-09-20 1993-03-24 Johnson Matthey Public Limited Company Draht für Kernstütze
US5338509A (en) * 1991-09-20 1994-08-16 Johnson Matthey Public Limited Company Method of using Pd-alloy pinning wires in turbine blade casting
EP1053804A1 (de) * 1999-05-20 2000-11-22 Asea Brown Boveri AG Kernstütze
EP1053805A1 (de) * 1999-05-20 2000-11-22 Asea Brown Boveri AG Halteelement
US7032642B2 (en) 2002-11-14 2006-04-25 Rolls-Royce Plc Investment moulding process and apparatus
EP2060339A1 (de) * 2003-10-15 2009-05-20 United Technologies Corporation Hochschmelzender Metallkern
EP1524046A1 (de) * 2003-10-15 2005-04-20 United Technologies Corporation Refraktärmetallkern
EP1531019A1 (de) * 2003-10-16 2005-05-18 United Technologies Corporation Refraktärmetallkern
GB2426730B (en) * 2004-02-27 2008-04-09 Shilling Ind Technologies And Investment casting pins
FR2874186A1 (fr) * 2004-08-12 2006-02-17 Snecma Moteurs Sa Procede de fabrication par moulage a cire perdue de pieces comportant au moins une cavite.
GB2417922A (en) * 2004-08-12 2006-03-15 Snecma A process for the manufacture by lost wax moulding of parts that include at least one cavity
US7275585B1 (en) 2004-08-12 2007-10-02 Snecma Process for the manufacture by lost wax moulding of parts that include at least one cavity
GB2417922B (en) * 2004-08-12 2009-11-18 Snecma A process for the manufacture by lost wax moulding of parts that include at least one cavity
WO2012052665A1 (fr) * 2010-10-19 2012-04-26 Snecma Moule d'injection pour modele en cire d'une aube de turbine a support du noyau isostatique
US8708029B2 (en) 2010-10-19 2014-04-29 Snecma Injection mold for a wax model of a turbine blade having an isostatic core holder
CN102139355A (zh) * 2011-03-15 2011-08-03 中核苏阀横店机械有限公司 一种定位芯撑
CN104923722A (zh) * 2015-06-24 2015-09-23 西安航空动力股份有限公司 空心导向叶片上缘板型腔壁厚的控制方法
CN104923722B (zh) * 2015-06-24 2017-03-22 西安航空动力股份有限公司 空心导向叶片上缘板型腔壁厚的控制方法

Also Published As

Publication number Publication date
GB2111881A (en) 1983-07-13

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE DE FR IT NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19840328

RIN1 Information on inventor provided before grant (corrected)

Inventor name: WHITTAKER, GEORGE ALAN