EP1127635A1 - Dispositif et procédé de moulage d'une pièce et pièce - Google Patents

Dispositif et procédé de moulage d'une pièce et pièce Download PDF

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Publication number
EP1127635A1
EP1127635A1 EP00104001A EP00104001A EP1127635A1 EP 1127635 A1 EP1127635 A1 EP 1127635A1 EP 00104001 A EP00104001 A EP 00104001A EP 00104001 A EP00104001 A EP 00104001A EP 1127635 A1 EP1127635 A1 EP 1127635A1
Authority
EP
European Patent Office
Prior art keywords
casting
workpiece
cores
casting cores
cavity
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Withdrawn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
EP00104001A
Other languages
German (de)
English (en)
Inventor
Peter Dipl.-Ing. Tiemann
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 EP00104001A priority Critical patent/EP1127635A1/fr
Priority to DE50100652T priority patent/DE50100652D1/de
Priority to PCT/EP2001/001014 priority patent/WO2001062414A1/fr
Priority to CNB018056229A priority patent/CN1273240C/zh
Priority to EP01921269A priority patent/EP1257373B1/fr
Priority to JP2001561465A priority patent/JP2003525125A/ja
Priority to US10/204,692 priority patent/US6712120B2/en
Publication of EP1127635A1 publication Critical patent/EP1127635A1/fr
Priority to US10/753,399 priority patent/US20040140079A1/en
Withdrawn legal-status Critical Current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
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D25/00—Special casting characterised by the nature of the product
    • B22D25/005—Casting metal foams

Definitions

  • the invention relates to a device for casting a Workpiece, in particular an internally cooled turbine blade, with a casting cavity in which casting cores are present, which create workpiece penetrating channels, as well as a method for casting a workpiece with the features of the generic term of claim 16 and a workpiece with the features the preamble of claim 18.
  • Hot gas pressurized, internally cooled turbine blades often cooled by a so-called film cooling At a Film cooling flows cooling air through holes from the inside of the blade profile to the outside. On the outside of the outer wall An air film forms on the blade profile, which is cooling works.
  • the holes are either cast directly or drilled afterwards.
  • For the cast holes cylindrical shaped for the continuous channels Casting cores in the two, the inside and outside of the outside wall forming mold parts attached. It thus arises Bores with a large bore diameter that are right are far apart. So you can find worse everywhere cooled areas between the film cooling holes. This is compensated for by the fact that a larger coolant flow than is actually needed to use this too adequately cool poorly cooled areas.
  • the object of the present invention is therefore a device for casting a workpiece without badly cooled Propose areas, especially if they are internally cooled Turbine blades are such a possibility sufficient film cooling with low coolant consumption to deliver.
  • the object is achieved in that casting cores in the casting cavity are placed loosely next to each other.
  • Casting core size and shape different density packing from Given casting cores Due to the loosely lying casting cores, one is depending Casting core size and shape different density packing from Given casting cores. At the contact points of the casting cores poured casting material is displaced. After pouring the core material is chemically removed from the material, for example by leaching. Workpieces penetrating arise Channels that are almost statistically over the area filled with casting cores are distributed, the channel density depending on the casting core size and shape in a predetermined Relation to casting core density.
  • the channels have Openings on both sides of the workpiece, as for the loose casting cores lying on top of each other, at least almost every casting core has a neighbor he touches and he has it turn a neighbor and so on until a related one Casting core touches the other outside of the workpiece.
  • the largest outer dimensions of the casting cores are smaller as the smallest internal dimensions of the casting cavity, it is ensures that at least at every point of the casting cavity two or more casting cores touching one another can be distributed over the cross section of the casting cavity. In this way, very small, branched channel structures, depending on the size, shape and packing density of the Generate casting cores.
  • the casting cores are approximately circular and / or ellipsoidal they are easy to pour and spread out good in the mold without leaving large, free volumes.
  • the casting cores have a large surface area for production from contact points with other, adjacent casting cores on, so that a high channel density in the cast workpiece given is.
  • ellipsoidal casting cores especially elongated channel sections at a high Establish channel density if the points of contact are predominant are due to the greatest dimensions of the ellipsoids.
  • casting cores are approximately the same size, as a result, very even, easily predictable channel structures produce.
  • the diameter of the casting cores is between approximately 0.1 to are approximately 2 mm, in particular with conventional ones Turbine blade wall thicknesses one for optimal film cooling Establish a sufficient number of channels.
  • the casting cores of this kind are therefore neither too small, which may have casting problems would bring itself too big, so that the cooling of the Workpiece is only possible with a high amount of coolant.
  • the casting cores have hollows with the casting material are fillable, is sufficient strength of the Workpiece despite its porous structure.
  • the casting cores show a through the hollows compared to theirs Volume large surface area. This is the share in Casting material in the casting workpiece increased.
  • the cavity is a hole and through a center of the casting core is particularly good strength of the workpiece also locally in the area of each core, since the casting cores are leached out after casting and each at least one central strut formed by the material remains, which ensures sufficient strength.
  • part of the workpiece can be filled with channels and another be solid. This is particularly so can be used with turbine blades by the casting cores only be filled in the area of the mold that the External walls created. Then only one outer wall is open porous, while the rest of the shovel contains the casting material in its has its original shape. The outer wall can then be cooled by means of a consumption-optimized film cooling.
  • the mesh width must be smaller than the diameter on the other hand, the casting cores are large enough to let through be the slag.
  • the size of the channels is still adjustable in that the casting cores introduced into the casting cavity subsequently can be coated with a casting-resistant material that adheres to them are.
  • the cast-resistant material adheres to both on the surface, as well as in particular at the points of contact two casting cores. This creates these points of contact reinforced and get a larger diameter, which in turn affects the channel diameter. Farther can through the material applied additional contact points arise if the casting cores are already very close together have, but have not yet touched. About that the coating also improves the casting cores held together and a floating of the casting cores in the Casting material prevented.
  • the casting material is poured into even the smallest Cavities in the casting mold, especially between the casting cores drawn. The emergence of cast material-free areas avoided. The casting process is also accelerated. By the Insertion of restraint devices, for example nets, prevents casting cores from being together with the casting material pulled towards the evacuation device.
  • the casting cores inserted into the casting cavity are retrofitted with a cast-resistant material that adheres to them are coated, they are kept in the shape without to have to use complex devices.
  • the coating process can target the channels several times repeated so as to stop between the cores improve or establish new connections.
  • the workpiece of channels is interspersed with a space lattice.
  • Such a workpiece can by passing cooling air on the other hand adequately cooled even with a low cooling air flow become. Own in the space lattice arrangement the channels, their diameter depending on the shape and the arrangement of the casting cores vary, mostly varied Branches and several openings.
  • optimal cooling is particularly a channel-penetrated outer wall of a conventional, internally cooled turbine blade guaranteed with film cooling.
  • FIGS. 1a, b, c show a section through part of a schematic Casting mold 10 of a turbine blade.
  • a casting cavity 1 is used to produce an outer wall 14 of an internally cooled Turbine blade as shown in Fig.3.
  • the coolant is thus flowed through from a coolant Interior transported out that the Outside 15 is covered by a coolant film and thus is cooled.
  • To generate such channels 3 is located in the casting cavity 1 a large number of casting cores 2, which in the casting cavity 1 are loosely inserted.
  • the casting cores 2 are for the sake of simplicity of illustration all elliptical in section in the same size without further Formations or hollows shown. Detailed representations the casting cores 2 can be found in FIGS. 2a, b, c.
  • the casting cores 2 are used to prevent floating or bringing in other workpiece areas by means of a device, for example a network 8 held together.
  • the casting cores 2 have approximately the same size and in the exemplary embodiment ellipsoidal, almost spherical shape and are very close together. They can be poured into the mold 10 which makes manufacturing easier. For compression it is possible to attach a shaker that works under effect gravity arranges the casting cores 2 even closer.
  • the Casting cores 2 are preferably made from a conventional casting core ceramic made so that after the casting process can be leached out of the workpiece, provided they connect to the outside 15 of the workpiece. Inside Casting cores 2 which are completely surrounded by casting material, can remain in the casting blank. However, it is extreme unlikely that casting cores 2 any other Touch casting cores 2. Because only one contact point per Casting core 2 is usually sufficient, a connection to any one Place one side of the outer wall up to the other Page to get as schematically by the dashed line indicated in Fig.1a, b. Thus, after leaching widely branched channel systems that lead through of the coolant. The channel width 16 can by subsequent stronger etching can be enlarged.
  • FIG. 1b shows schematically arranged in a casting cavity 1 Casting cores 2 which after filling in the mold 10 with a pour-resistant material, for example a thin liquid Ceramics adhering to the surface 21 of the casting cores 2, encased and pourable by drying and / or heating have been coated.
  • a pour-resistant material for example a thin liquid Ceramics adhering to the surface 21 of the casting cores 2, encased and pourable by drying and / or heating have been coated.
  • a pour-resistant material for example a thin liquid Ceramics adhering to the surface 21 of the casting cores 2, encased and pourable by drying and / or heating have been coated.
  • a pour-resistant material for example a thin liquid Ceramics adhering to the surface 21 of the casting cores 2
  • encased and pourable by drying and / or heating have been coated.
  • Through this subsequent wrapping 22 become contact surfaces of existing connection points 11 between the casting cores 2 enlarged and possibly additional Contact points 18 with the outer sides of the casting
  • 2a, b, c show perspective views of various Casting cores 2.
  • the casting cores 2 have hollows.
  • the cavity runs in the form of a central bore 19 through the center 7 of an almost spherical casting core 2. This hole 19 is made during casting with casting material filled up and when the surrounding casting core 2 after the casting is removed by leaching remains a central one Casting material struts are available for strength in this Area contributes significantly.
  • the casting core volume in favor of the casting material volume decreased.
  • Fig. 2b shows an ellipsoidal, almost disc-like casting core 2 with an almost central bore 19, but at one Side has an additional opening, which creates a side open ring is created. In this way, casting material penetrate more easily into the cavity in the form of the bore 19 and it is an additional stabilizing side strut made from casting material.
  • FIG. 2c shows a spherical casting core 2 with three central ones Bores 19, which meet in the center 7 of the casting core 2. Casting material can thus enter the casting core from the three sides 2 penetrate, which in this way has a very large surface area and has a very small volume and thus the Stability of the workpiece 20 increased.
  • the mold 10 is attached to an evacuation device connected, which is not shown. In this way the casting material through the mold 10 in all narrowest areas of the mold 10 drawn between the casting cores 2.
  • FIG. 3 shows a section through an outer wall penetrated by a channel 14 of a turbine blade.
  • the casting cores 2 are from the Workpiece 20 has been leached and the voids left behind are connected at the contact points 11 of the casting cores 2, whereby through the outer wall 14 between the inside 17 and outside 15 extending channels 3 have arisen.
  • the Channels 3 in Figure 3 are simplified for reasons of clarity shown schematically. In principle, they are narrower and have more branches and openings 6.
  • the canals 3 have different lengths and branches and are, depending on the choice of size and shape of the casting cores 2, on their openings 6 on the outside 15 very closely arranged. This way, film cooling can cover any area of the outside 15 reach the outer wall 14 of the turbine blade and it is sufficient even with a small amount of coolant Cooling of the outer wall 14 ensured.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP00104001A 2000-02-25 2000-02-25 Dispositif et procédé de moulage d'une pièce et pièce Withdrawn EP1127635A1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP00104001A EP1127635A1 (fr) 2000-02-25 2000-02-25 Dispositif et procédé de moulage d'une pièce et pièce
DE50100652T DE50100652D1 (de) 2000-02-25 2001-01-31 Vorrichtung und verfahren zum giessen eines werkstücks und werkstück
PCT/EP2001/001014 WO2001062414A1 (fr) 2000-02-25 2001-01-31 Dispositif et procede de moulage d'une piece et piece ainsi obtenue
CNB018056229A CN1273240C (zh) 2000-02-25 2001-01-31 铸造工件的装置和方法以及工件
EP01921269A EP1257373B1 (fr) 2000-02-25 2001-01-31 Dispositif et procede de moulage d'une piece et piece ainsi obtenue
JP2001561465A JP2003525125A (ja) 2000-02-25 2001-01-31 工作物の鋳造装置及び鋳造方法並びに工作物
US10/204,692 US6712120B2 (en) 2000-02-25 2001-01-31 Device and method for casting a workpiece and workpiece
US10/753,399 US20040140079A1 (en) 2000-02-25 2004-01-09 Device and method for casting a workpiece, and workpiece

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP00104001A EP1127635A1 (fr) 2000-02-25 2000-02-25 Dispositif et procédé de moulage d'une pièce et pièce

Publications (1)

Publication Number Publication Date
EP1127635A1 true EP1127635A1 (fr) 2001-08-29

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP00104001A Withdrawn EP1127635A1 (fr) 2000-02-25 2000-02-25 Dispositif et procédé de moulage d'une pièce et pièce
EP01921269A Expired - Lifetime EP1257373B1 (fr) 2000-02-25 2001-01-31 Dispositif et procede de moulage d'une piece et piece ainsi obtenue

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP01921269A Expired - Lifetime EP1257373B1 (fr) 2000-02-25 2001-01-31 Dispositif et procede de moulage d'une piece et piece ainsi obtenue

Country Status (6)

Country Link
US (2) US6712120B2 (fr)
EP (2) EP1127635A1 (fr)
JP (1) JP2003525125A (fr)
CN (1) CN1273240C (fr)
DE (1) DE50100652D1 (fr)
WO (1) WO2001062414A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10358166B4 (de) * 2002-12-12 2009-06-10 General Electric Co. Mit Kern ausgebildete Dampfturbinenschaufel
EP2418354A1 (fr) 2010-08-10 2012-02-15 Siemens Aktiengesellschaft Procédé de fabrication d'une aube de turbine refroidie de l'intérieur et turbine à gaz dotée d'une aube de turbine ainsi fabriquée

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1127635A1 (fr) * 2000-02-25 2001-08-29 Siemens Aktiengesellschaft Dispositif et procédé de moulage d'une pièce et pièce
US20050000674A1 (en) * 2003-07-01 2005-01-06 Beddard Thomas Bradley Perimeter-cooled stage 1 bucket core stabilizing device and related method
US7674093B2 (en) * 2006-12-19 2010-03-09 General Electric Company Cluster bridged casting core
DE102009051008B4 (de) * 2009-10-28 2013-05-23 Siltronic Ag Verfahren zur Herstellung einer Halbleiterscheibe
US11021968B2 (en) * 2018-11-19 2021-06-01 General Electric Company Reduced cross flow linking cavities and method of casting

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4314794A (en) * 1979-10-25 1982-02-09 Westinghouse Electric Corp. Transpiration cooled blade for a gas turbine engine
JPH02220733A (ja) * 1989-02-22 1990-09-03 Aisin Seiki Co Ltd 内燃機関用ピストンの製造方法
US5810552A (en) * 1992-02-18 1998-09-22 Allison Engine Company, Inc. Single-cast, high-temperature, thin wall structures having a high thermal conductivity member connecting the walls and methods of making the same
JP3110227B2 (ja) * 1993-11-22 2000-11-20 株式会社東芝 タービン冷却翼
DE19821770C1 (de) * 1998-05-14 1999-04-15 Siemens Ag Verfahren und Vorrichtung zur Herstellung eines metallischen Hohlkörpers
US6505673B1 (en) * 1999-12-28 2003-01-14 General Electric Company Method for forming a turbine engine component having enhanced heat transfer characteristics
US6302185B1 (en) * 2000-01-10 2001-10-16 General Electric Company Casting having an enhanced heat transfer surface, and mold and pattern for forming same
EP1127635A1 (fr) * 2000-02-25 2001-08-29 Siemens Aktiengesellschaft Dispositif et procédé de moulage d'une pièce et pièce

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
No relevant documents disclosed *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10358166B4 (de) * 2002-12-12 2009-06-10 General Electric Co. Mit Kern ausgebildete Dampfturbinenschaufel
EP2418354A1 (fr) 2010-08-10 2012-02-15 Siemens Aktiengesellschaft Procédé de fabrication d'une aube de turbine refroidie de l'intérieur et turbine à gaz dotée d'une aube de turbine ainsi fabriquée

Also Published As

Publication number Publication date
US20040140079A1 (en) 2004-07-22
DE50100652D1 (de) 2003-10-23
CN1406160A (zh) 2003-03-26
CN1273240C (zh) 2006-09-06
US6712120B2 (en) 2004-03-30
JP2003525125A (ja) 2003-08-26
WO2001062414A1 (fr) 2001-08-30
US20030010469A1 (en) 2003-01-16
EP1257373B1 (fr) 2003-09-17
EP1257373A1 (fr) 2002-11-20

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