EP2036634A1 - Schleudergiessverfahren und Vorrichtung - Google Patents

Schleudergiessverfahren und Vorrichtung Download PDF

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Publication number
EP2036634A1
EP2036634A1 EP08252676A EP08252676A EP2036634A1 EP 2036634 A1 EP2036634 A1 EP 2036634A1 EP 08252676 A EP08252676 A EP 08252676A EP 08252676 A EP08252676 A EP 08252676A EP 2036634 A1 EP2036634 A1 EP 2036634A1
Authority
EP
European Patent Office
Prior art keywords
alloy
chamber
mould
aluminium
impurity
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
EP08252676A
Other languages
English (en)
French (fr)
Other versions
EP2036634B1 (de
Inventor
Wayne Eric Voice
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.)
Rolls Royce PLC
Original Assignee
Rolls Royce 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 Rolls Royce PLC filed Critical Rolls Royce PLC
Publication of EP2036634A1 publication Critical patent/EP2036634A1/de
Application granted granted Critical
Publication of EP2036634B1 publication Critical patent/EP2036634B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
    • B22D13/107—Means for feeding molten metal

Definitions

  • This invention relates to methods and apparatus for centrifugal casting of components.
  • a method of forming a cast component comprising the steps of: providing a chamber containing a molten alloy and an impurity; rotating the chamber about an axis to separate the alloy and the impurity by centrifuging; and supplying the alloy from the chamber to a mould rotating about the axis to centrifugally cast the alloy in the mould.
  • the molten alloy comprises titanium, vanadium, chromium and aluminium.
  • the molten alloy may be formed from the oxides of at least some of its constituent elements which react exothermically in the chamber.
  • the impurity may be aluminium oxide.
  • a conduit between the chamber and the mould may have a supply valve which is opened to allow molten alloy to be supplied to the mould.
  • apparatus for forming a cast component comprising a chamber for holding an alloy and being rotatable about an axis, a rotatable mould rotatable about the axis, a conduit connecting the chamber with the mould, rotating means for rotating the chamber with a velocity sufficient to separate molten alloy from an impurity by centrifuging and for rotating the mould with sufficient velocity to centrifugally cast a component.
  • the conduit may have a supply valve for allowing the supply of alloy from the chamber to the mould.
  • the mould is annular.
  • Figure 1 depicts a centrifugal casting apparatus in accordance with a first embodiment of the invention.
  • the apparatus comprises a chamber 2 and a mould 4 connected by a conduit 6.
  • the chamber and mould are mounted together on a frame (not shown) which enables the two components to rotate about an axis 8.
  • An alloy is added to the chamber which must be capable of withstanding the melting point of the alloy.
  • the alloy may be provided as an ingot having the desired composition which is melted within the chamber. Alternatively the ingot is melted away from the chamber in a crucible or such like and added to the chamber 2 in its molten form. Additional heating elements (not shown) may be provide in or around the chamber 2 to maintain the alloy in its molten state. In the preferred embodiment, described in greater detail below, the alloy is formed during an exothermic reaction within the chamber between molten aluminium and oxides selected from titanium, vanadium and / chromium.
  • the alloy may contain impurities which will affect the final characteristics of the cast component.
  • the chamber 2 is rotated about the axis 8 to separate the alloy 10 from the impurity 12 centrifugally.
  • a supply valve in the conduit is opened to supply the alloy to the mould 4 for the centrifugal casting process.
  • the mould 4 lies further away from the axis than the chamber 2 which allows the alloy to be supplied using the generated centrifugal force.
  • the alloy may be pumped from the chamber to the mould.
  • the mould 4 like the chamber 2, rotates about the axis 8 and produces a sound, porous free casting with a fine grain size due to the relatively rapid solidification of the alloy and the centrifugal force exerted which breaks up dendrite formation whilst forming an accurate cast shape.
  • the mould is preferably ceramic formed using a lost wax process.
  • the mould is annular.
  • an appropriate mould shape is required. It may be necessary to provide a counter-balance to ensure smooth rotation of the mould about the axis.
  • the alloy comprises titanium, vanadium, chromium and aluminium.
  • the preferred alloy has 25wt%V, 15%Cr, 2%Al with the balance being Ti plus any impurities.
  • the preferred method of forming the alloy is to load the chamber 2 with titanium, vanadium and chromium oxides in powder, flake or particle form. Aluminium is added to the chamber in flake form and mixed with the other elements.
  • aluminium oxides of the elements When the oxides of the elements combine with molten aluminium they react exothermically to give aluminium oxide Al 2 O 3 and liquid alloy.
  • the aluminium oxide is an impurity and must be removed else the final characteristic of the alloy will be affected.
  • the constituent oxides and aluminium flakes are placed in the chamber 2 as a charge.
  • a mass, preferably disk shaped, and formed of the desired alloy is placed at the base of the chamber 2 to prevent the charge from entering the cast.
  • the aluminium in the chamber is heated till it is melted.
  • the exothermic reaction can be started by means of an electrical resistance heating wire at the point furthest from the disk.
  • this technique means that the charge need not be heated en masse.
  • the reaction propagates through the charge till all the powder or flakes have been converted to their base metals and alloyed. Sufficient aluminium flakes are provided so that once all the oxides have been reduced to their base metals a small proportion of the aluminium remains to be alloyed with the other components.
  • Al 2 O 3 is less dense than the alloy and is squeezed to the inside of the chamber by the alloy moving outwards under the influence of the centrifugal force. The alloy may then be supplied to the mould. It typically takes less than 5 minutes for the reaction to propagate through the charge depending on the charge constituents, size of the charge and rotational speed.
  • the heat of the alloy causes the disk to melt which allows the flow of molten alloy into the rotating cast component.
  • the alloy continues to flow till the cast is full and it is therefore important that the volume of the cast is equal to or less than the volume of alloy formed in the chamber to stop impurities from entering the cast.
  • the rotational speed and density difference between the alloy and the aluminium oxide should be sufficient to allow adequate separation before the disk melts. Routine trial and error experiments may be used to determine an acceptable rotational velocity for any given alloy and charge size to ensure adequate separation of the alloy from the impurity. By changing the properties of the disk, either physically or compositionally it is possible to change the time taken for it to melt and thereby control the supply of alloy to the cast in that way.
  • the density difference between the aluminium oxide impurity at 2.5 g/cm ⁇ 3 and the alloy at around 5g/cm ⁇ 3 a revolution velocity of 200 rpm is sufficient to separate the alloy and impurity.
  • the present invention offers significant advantages. Offering the ability to separate impurities from the alloy during the casting process enables high quality control and the use of alloy stock having higher levels of impurity.
  • the technique enables the desired quantity of alloy to be manufactured at its point of use which overcomes the need to melt the alloy first during manufacture and again as it is used in the casting process with significant energy savings.
  • the reliance on the alloy supply chain is reduced as the alloy can be made at its point of use using its constituent elements.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP08252676A 2007-09-14 2008-08-12 Schleudergiessverfahren und Vorrichtung Not-in-force EP2036634B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB0717925.2A GB0717925D0 (en) 2007-09-14 2007-09-14 Centrifugal casting method and apparatus

Publications (2)

Publication Number Publication Date
EP2036634A1 true EP2036634A1 (de) 2009-03-18
EP2036634B1 EP2036634B1 (de) 2010-08-11

Family

ID=38658946

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08252676A Not-in-force EP2036634B1 (de) 2007-09-14 2008-08-12 Schleudergiessverfahren und Vorrichtung

Country Status (4)

Country Link
US (1) US20090071622A1 (de)
EP (1) EP2036634B1 (de)
DE (1) DE602008002117D1 (de)
GB (1) GB0717925D0 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3364978A (en) * 1963-11-30 1968-01-23 Sumitomo Metal Ind Method of centrifugal casting of clean ingots
US4162039A (en) * 1976-07-05 1979-07-24 Aktiebolaget Skf Feeding and mixing nozzle
JPH08262008A (ja) * 1995-03-23 1996-10-11 Nippon Steel Corp 分析用サンプルの製造方法
JP2000024008A (ja) * 1998-07-15 2000-01-25 Kyutai Dentceram Co Ltd 歯科用遠心鋳造機

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899297A (en) * 1959-08-11 magel
US1942004A (en) * 1930-07-29 1934-01-02 Firm Th Goldschmidt A G Process for improving aluminogenetic iron
US2514793A (en) * 1949-07-19 1950-07-11 Exomet Foundry casting
US6935406B2 (en) * 2003-02-06 2005-08-30 Massachusetts Institute Of Technology High pressure centrifugal casting of composites

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3364978A (en) * 1963-11-30 1968-01-23 Sumitomo Metal Ind Method of centrifugal casting of clean ingots
US4162039A (en) * 1976-07-05 1979-07-24 Aktiebolaget Skf Feeding and mixing nozzle
JPH08262008A (ja) * 1995-03-23 1996-10-11 Nippon Steel Corp 分析用サンプルの製造方法
JP2000024008A (ja) * 1998-07-15 2000-01-25 Kyutai Dentceram Co Ltd 歯科用遠心鋳造機

Also Published As

Publication number Publication date
EP2036634B1 (de) 2010-08-11
GB0717925D0 (en) 2007-10-24
DE602008002117D1 (de) 2010-09-23
US20090071622A1 (en) 2009-03-19

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