EP1741531A1 - Moule pour la fabrication d'un écran thérmique en céramique - Google Patents

Moule pour la fabrication d'un écran thérmique en céramique Download PDF

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Publication number
EP1741531A1
EP1741531A1 EP05014798A EP05014798A EP1741531A1 EP 1741531 A1 EP1741531 A1 EP 1741531A1 EP 05014798 A EP05014798 A EP 05014798A EP 05014798 A EP05014798 A EP 05014798A EP 1741531 A1 EP1741531 A1 EP 1741531A1
Authority
EP
European Patent Office
Prior art keywords
mold
shell
molding
heat shield
mold shell
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Withdrawn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
EP05014798A
Other languages
German (de)
English (en)
Inventor
Holger Grote
Marc Tertilt
Andreas Heilos
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 EP05014798A priority Critical patent/EP1741531A1/fr
Priority to EP05803716A priority patent/EP1817147A1/fr
Priority to PCT/EP2005/012447 priority patent/WO2006058629A1/fr
Priority to US11/792,068 priority patent/US8522559B2/en
Priority to US11/482,642 priority patent/US7306194B2/en
Publication of EP1741531A1 publication Critical patent/EP1741531A1/fr
Priority to US12/774,049 priority patent/US9314939B2/en
Priority to US13/477,354 priority patent/US20120228468A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/0002—Auxiliary parts or elements of the mould
    • B28B7/0014—Fastening means for mould parts, e.g. for attaching mould walls on mould tables; Mould clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
    • B28B1/16—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted for producing layered articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/0056—Means for inserting the elements into the mould or supporting them in the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/0064—Moulds characterised by special surfaces for producing a desired surface of a moulded article, e.g. profiled or polished moulding surfaces
    • B28B7/0079—Moulds characterised by special surfaces for producing a desired surface of a moulded article, e.g. profiled or polished moulding surfaces with surfaces for moulding interlocking means, e.g. grooves and ribs

Definitions

  • the present invention relates to a mold for producing a ceramic heat shield element.
  • the walls of hot gas-carrying combustion chambers require a thermal shielding of their supporting structure against hot gas attack.
  • the thermal shielding can be realized, for example, by means of a hot gas lining upstream of the actual combustion chamber wall, for example in the form of a ceramic heat shield.
  • a hot gas lining is usually constructed from a number of ceramic heat shield elements with which the combustion chamber wall is lined in a planar manner. Ceramic materials are ideally suited for the construction of the hot gas lining compared to metallic materials because of their high temperature resistance, corrosion resistance and low thermal conductivity.
  • a ceramic heat shield is, for example, in EP 0 558 540 B1 described.
  • a heat shield element may comprise a core region and an edge region, the thermal conductivity of the material being lower in the edge region than in the core region.
  • Such a heat shield element is in EP 1 508 761 A1 described.
  • the ceramic heat shield element 100 shown in FIG. 1 has a hot side 102 which faces the hot gas when the heat shield element 100 is installed in the heat shield of a combustion chamber.
  • the hot side 102 opposite is the cold side 104, which is to be protected combustion chamber wall facing, when the heat shield element is installed in a heat shield.
  • circumferential sides 106, 108 are present, which extend between the hot side 102 and the cold side 104.
  • Two mutually opposite peripheral sides 108 are also provided with grooves 110 which serve to fix the heat shield element 100 to the supporting wall structure by means of holding elements.
  • Figure 2 shows a perspective view of a mold 200 for producing the heat shield element of Figure 1.
  • the mold 200 consists of a number of mold parts 202a to 202e, which are inserted into a molding box 203 and held by this in position.
  • the inner surfaces 204, 206, 208 of the molded parts 202a to 202e represent the molding surfaces for molding the surface of the heat shield element 100.
  • the inner surface 204 serves to form the cold side 104 of the heat shield element, the inner surfaces 206 to form the side surfaces 106 without the groove and the inner surfaces 208 for forming the side surfaces 108 with groove 110.
  • the inner surfaces 208 have for forming the grooves 110 spring-like projections 210 on.
  • a ceramic molding compound 220 is introduced into the mold 200 with the mold parts 202a to 202e inserted and then pressed into the mold by means of a punch 212.
  • the molding compound 220 facing surface 214 of the punch 212 thereby forms the hot gas surface 102 of the ceramic heat shield element 100.
  • the necessary for pressing the molding material 220 pressing pressure requires that the mold 200 is completely closed during pressing, ie the punch 212 must be formed to fit the mold 200 be.
  • the pressing pressure can lead to a springback of the moldings. Fluctuations in the amount of material of the molding compound 220 can also lead to variations in the thickness of the finished ceramic heat shield element.
  • the heat shield element 100 can also be cast using the mold 200, i. without a pressing process takes place.
  • the heat shield element is cast lying, either the hot side 102 or the cold side 104 is not defined by the mold during casting. The undefined side requires elaborate finishing after casting to produce the desired shape of the heat shield element 100.
  • the molds described are not suitable for producing a heat shield element in a single casting or pressing step, which has different material regions with different material properties. Also, the production of heat shield elements with reinforcing elements inside is not possible.
  • the object of the present invention is therefore to provide a form which is advantageous over the described prior art for producing a ceramic heat shield element.
  • Another object of the present invention is to provide an advantageous method for producing a ceramic heat shield element.
  • the first object is achieved by a mold according to claim 1 and the second object by a method according to claim 11.
  • the dependent claims contain advantageous embodiments of the invention.
  • a mold according to the invention for producing a ceramic heat shield element has a mold shell comprising a number of molding surfaces and a pouring port for pouring a ceramic material.
  • the mold shell is designed as a one-piece mold shell during casting and the pouring opening is formed as an opening in one of the mold surfaces.
  • the term "one-piece mold shell when casting” is intended in this context not be understood to the effect that the mold shell is formed from a single piece monolithic, but rather to the effect that the mold shell when pouring the casting material not two not firmly interconnected elements, eg. From only inserted into a mold box moldings and a stamp like with reference to Figures 2, 3a and 3b described.
  • the mold according to the invention may be composed of a number of individual parts, as long as they are firmly connected to each other during pouring of the molding compound.
  • no mold box is necessary in the inventive form.
  • such a mold box impedes the production of graded and / or reinforced heat shield elements, since the molded parts are arranged inaccessible in the inner mold box during the manufacture of a heat shield element.
  • the mold is composed of a plurality of parts to be firmly bonded together for the molding process for forming the one-piece mold shell, easy removal of the cured heat shield element by detaching the individual parts from each other is possible.
  • the mold according to the invention there is a mold surface with a pouring opening for feeding the mold.
  • the molding surface in which the pouring opening is present determines the corresponding surface of the heat shield element at least partially.
  • all the surfaces of the heat shield element can be formed at least roughly, without a pressing of the heat shield element would be necessary.
  • the rudimentary existing molding surface in the region of the pouring opening in this case means that in the region of the inlet opening existing superfluous casting material after curing with the aid of the formed by the molding surface approach the heat shield element surface can be removed as a reference surface. The removal of excess material and the finishing of the heat shield element is therefore possible with relatively little effort.
  • the dimensions of the molded heat shield element do not depend on the cast-in amount of material when using the mold according to the invention, since no pressing takes place. Since in the pressing process according to the prior art, the mold is completely closed, there is no possibility for the casting material to emerge from the mold. Fluctuating amounts of casting material therefore lead to the production of heat shield elements of different thickness. On the other hand, in the mold according to the invention, excess casting material can escape through the pouring opening, without thereby affecting the dimensions of the heat shield element. In addition, occurs in casting and no springback of the mold under pressing pressure. The mold according to the invention therefore makes it possible to produce heat shield elements with reduced tolerances.
  • the mold according to the invention comprises, in particular, molding surfaces for forming a large-area first surface and a large-area second surface, and molding surfaces for molding peripheral surfaces which extend from the first surface to the second surface in comparison to these.
  • the pouring port is then formed in a molding surface for molding one of the peripheral surfaces.
  • At least one separating element is provided, with which different regions can be separated from each other in the interior of the mold shell.
  • the separating element is designed and arranged in the mold shell so that it can be removed again from the interior of the mold shell before the cast ceramic material is cured without the mold being opened.
  • the preparation of a graded heat shield element can then be done, for example, by the inserts are inserted into the mold before pouring the ceramic material, then the ceramic material is poured and after the pouring of the ceramic, the bays are removed again. After removal of the inserts, the different ceramic material can come into contact with each other and thus form a cohesive connection during curing. It is also possible that the adjoining materials mix on removal of the separating elements in the boundary region, so that after curing, a heat shield element is present, in which the two materials have a smooth transition into each other.
  • the at least one separating element can be designed in particular as a slot for insertion into the mold shell through the pouring opening.
  • Another possibility is to provide two inserts which separate the interior of the mold shell into a central region and into two regions which face opposing mold surfaces for molding peripheral surfaces of the heat shield element.
  • this can comprise at least one retaining element to be introduced into the interior of the shell mold.
  • the retaining element is designed and arranged such that it can fix a body, for example a reinforcing element, in the interior of the shell mold and that it can be removed again from the interior of the shell mold before the cast ceramic material is cured.
  • a body for example a reinforcing element
  • the retaining pins may be arranged in the molding surface for molding a large-area first surface and / or in the molding surface for molding a large-area second surface.
  • bodies such as, for example, reinforcing elements can be held in the interior of the mold when the ceramic material is poured in. After the ceramic material is poured in, the holding elements can be removed from the interior of the mold, so that the body is held solely by the surrounding ceramic material. After curing, the body forms a body cast into the ceramic heat shield element. In this way, for example, high-strength reinforcing elements can be introduced into a ceramic heat shield element.
  • a ceramic heat shield element is produced using a casting process.
  • a mold according to the invention is used for casting.
  • FIG. 1 shows a perspective view of a ceramic heat shield element.
  • Figure 2 shows schematically a mold for producing a heat shield element, as shown in Figure 1, in a perspective view.
  • Figure 3 shows the mold shown in Figure 2 in a sectional side view.
  • FIG. 4 shows the individual parts of a first exemplary embodiment of the mold according to the invention.
  • FIG. 5 shows the individual parts of a second exemplary embodiment of the mold according to the invention.
  • FIG. 6 shows the individual parts for a third embodiment of the mold according to the invention.
  • Figure 7 shows the shape of the third embodiment in a side view.
  • Figure 8 shows the shape of the third embodiment in a plan view.
  • FIG. 9 shows an opened mold according to the invention with a ceramic heat shield element arranged therein.
  • FIG. 10 shows a mold shell with inserts arranged therein for separating different regions in the interior of the mold shell.
  • FIG. 11 shows a mold shell with an insert arranged therein for separating different regions in the interior of the mold shell.
  • FIG. 1 A first embodiment of a mold according to the invention for producing a ceramic heat shield element, as shown schematically in Figure 1, Figure 4.
  • the figure shows the individual parts of the mold shell, which are firmly but detachably connected to each other before pouring a ceramic material.
  • the connection is made in the present embodiment by means of clamping connections, but it can just as well by means of other releasable connections, for example. Screw connections, brought about.
  • clamping connections have the advantage over screw connections that they can be manufactured and loosened without tools.
  • the individual parts which can be connected to the mold shell comprise the shell elements 1 and 3 which have molding surfaces 2 and 4 with which the hot side 102 and the cold side 104 of the heat shield element 100 are formed.
  • side parts 5 and 7 are present, which each have a spring-like projection 6, 8. These two individual parts form the molding surfaces for the circumferential sides 108 of the heat shield element 100 which are provided with the grooves 110.
  • the spring-like projections 6, 8 serve to form the grooves.
  • the mold shell includes a bottom member 9 which serves a forming surface 10 for molding one of the peripheral sides 106 of the heat shield member 100 without grooves.
  • the shape is on the bottom element.
  • the two shell elements 11, 13, which lie opposite the bottom element 9 in the composite shell mold.
  • the two shell elements 11, 13 are provided with recesses 12, 14, which are arranged such in that, after assembly of the two shell elements 11, 13, they form a pouring opening for pouring in the ceramic material.
  • these two shell parts each have a forming surface 15, 17, are formed with the edge regions of the second peripheral side 106 without a groove.
  • webs 16, 18 are provided with which the pouring of the assembled shell mold is divided into two partial openings. If the ceramic material is poured only in one partial opening, air can escape from the interior of the shell mold through the other partial opening.
  • FIG. 9 shows the molded shell in the partially assembled state after the casting of a ceramic heat shield element 100.
  • the shell parts 4, 5 and 7 from FIG. 4 can be seen.
  • FIG. 9 shows in particular that parts of the peripheral side 106 are formed during casting in the region of the pouring opening. Casting residues 112 on the ceramic heat shield element 100 are mechanically removed after curing.
  • the already formed parts of the peripheral side 106 can serve as a reference surface.
  • the shell element 1 is provided with four clamping elements 19, which can be brought into engagement and tensioned with hooks 20 of the shell element 3.
  • forming projections 21 are present, which cooperate form-fitting with various form protrusions or recesses of other shell elements .
  • pins 22 are present, which engage in receptacles 23 adjacent mold elements and thus prevent displacement of the mold elements against each other.
  • the mold shown in FIG. 4 also comprises inserts 24, which can be introduced through the pouring opening into the interior of the mold shell in order to separate different regions in the interior of the mold shell from one another.
  • inserts 24 can be introduced through the pouring opening into the interior of the mold shell in order to separate different regions in the interior of the mold shell from one another.
  • guide grooves 25 are present in the shell element.
  • the shell element 11 has guide recesses 26 for guiding the inserts 24.
  • the inserts 24 are inserted into the composite shell mold prior to casting a heat shield element, so that in its interior regions which are adjacent to the shell elements 5, 7 with the spring-like projections 6, 8 are separated from a central region.
  • another ceramic material is poured as in the central region of the shell mold. After pouring the inserts 24 are removed from the shell mold, so that the two materials can mix in the border miteinender and produce a cohesive bond during curing. In this way, graded heat shield elements can be produced.
  • the composite shell mold with inserts arranged therein is shown in FIG.
  • FIG. 5 shows the mold shell of the mold in individual parts. To avoid repetition, only the differences to the form shown in Figure 4 will be discussed.
  • the reference numerals of the shell elements shown in Figure 5 are consistent with the reference numerals of the corresponding shell elements of Figure 4.
  • the form shown in FIG. 5 comprises only one insert 34, which is suitable for the interior of the assembled one Mold shell in a hot-side region, ie, a region adjacent to the shell member 1 with the mold surface 2 for forming the hot side 102, and a cold-side region, ie a region adjacent to the shell member 3 with the forming surface 4 for forming the cold side 104 , separates. Accordingly, no guide grooves are present in the shell elements 1 and 11. Instead, the spring-like projections 6 and 8 have guide grooves for guiding the insert 34.
  • FIG. 6 shows a third exemplary embodiment of the mold according to the invention. Like FIGS. 4 and 5, FIG. 6 shows the mold shell disassembled into its individual parts. The individual parts are designated by the same reference numerals as the corresponding individual parts of FIGS. 4 and 5. In order to avoid unnecessary repetition, reference will be made here only to the differences from the shapes shown in FIGS. 4 and 5.
  • the mold shell of Figure 6 is not intended for the insertion of inserts. Accordingly, the shell elements also have no guide grooves for such moldings. Instead, in the shell elements 1 and 3 retaining pins 40 are present, which are arranged to be movable so that they are in composite shell mold from the outside of the shell elements 1, 3 from being introduced into the interior of the shell mold. For this purpose, a retaining pin plate 42 carrying the retaining pins 40 is arranged on the outside of the shell molds 1, 3, the distance of which can be varied from the outside of the respective shell element 1, 3 by means of a crank 44 or by means of an automated configuration of the retaining pins.
  • the retaining pins 40 can be used to hold, for example, reinforcing elements during the pouring of the ceramic material in the interior of the shell mold.
  • the holding can be accomplished, for example, solely by the holding pins 40 pressing against the reinforcing element from two opposite sides and fixing the latter by means of the friction which arises in the process.
  • reinforcing elements in particular planar reinforcing elements can be introduced into the interior of the shell mold, which extend, for example, parallel to the hot side or cold side 102, 104 of the heat shield element 100 to be formed.
  • rod-shaped or bone-shaped reinforcing elements can also be introduced into the interior of the shell mold, which extend substantially along the shell elements 5, 7, 9, which form the peripheral sides 106, 108 of the heat shield element 100. In the finished heat shield element, the reinforcing elements then extend along the peripheral sides 106, 108.
EP05014798A 2004-12-01 2005-07-07 Moule pour la fabrication d'un écran thérmique en céramique Withdrawn EP1741531A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP05014798A EP1741531A1 (fr) 2005-07-07 2005-07-07 Moule pour la fabrication d'un écran thérmique en céramique
EP05803716A EP1817147A1 (fr) 2004-12-01 2005-11-21 Element ecran thermique, procede et moule pour sa fabrication, revetement a gaz chaud et chambre de combustion
PCT/EP2005/012447 WO2006058629A1 (fr) 2004-12-01 2005-11-21 Element ecran thermique, procede et moule pour sa fabrication, revetement a gaz chaud et chambre de combustion
US11/792,068 US8522559B2 (en) 2004-12-01 2005-11-21 Heat shield element, method and mold for the production thereof, hot-gas lining and combustion chamber
US11/482,642 US7306194B2 (en) 2005-07-07 2006-07-07 Mold for producing a ceramic heat shield element
US12/774,049 US9314939B2 (en) 2004-12-01 2010-05-05 Heat shield element, method and mold for the production thereof, hot-gas lining and combustion chamber
US13/477,354 US20120228468A1 (en) 2004-12-01 2012-05-22 Heat Shield Element, Method and Mold for the Production Thereof, Hot-Gas Lining and Combustion Chamber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05014798A EP1741531A1 (fr) 2005-07-07 2005-07-07 Moule pour la fabrication d'un écran thérmique en céramique

Publications (1)

Publication Number Publication Date
EP1741531A1 true EP1741531A1 (fr) 2007-01-10

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EP05014798A Withdrawn EP1741531A1 (fr) 2004-12-01 2005-07-07 Moule pour la fabrication d'un écran thérmique en céramique

Country Status (2)

Country Link
US (1) US7306194B2 (fr)
EP (1) EP1741531A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008009893A1 (de) * 2008-02-19 2009-08-20 GM Global Technology Operations, Inc., Detroit Hitzeschutzschild
WO2013029980A1 (fr) * 2011-08-31 2013-03-07 Siemens Aktiengesellschaft Procédé de fabrication de céramiques réfractaires pour installations de turbine à gaz

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US9259853B2 (en) 2011-02-02 2016-02-16 Anchor Wall Systems, Inc. Molds for producing concrete blocks with roughened surfaces; blocks made therefrom; and methods of use
US10708666B2 (en) * 2016-08-29 2020-07-07 Qualcomm Incorporated Terrestrial broadcast television services over a cellular broadcast system

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DE2713658A1 (de) * 1977-03-28 1978-10-05 Plibrico Co Gmbh Verfahren und vorrichtung zum herstellen von feuerfesten elementen
EP0558540B1 (fr) 1990-11-29 1995-06-14 Siemens Aktiengesellschaft Ecran thermique en ceramique monte sur une structure portante
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DE19704771A1 (de) * 1997-02-08 1998-08-13 Kobra Formen & Anlagenbau Gmbh Verfahren und Vorrichtung zum Einlegen einer Bewehrungsmatte in eine Form
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EP1508761A1 (fr) 2003-08-22 2005-02-23 Siemens Aktiengesellschaft Pierre servant de bouclier thermique pour garnir une paroi de chambre de combustion, chambre de combustion et turbine a gaz correspondantes

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008009893A1 (de) * 2008-02-19 2009-08-20 GM Global Technology Operations, Inc., Detroit Hitzeschutzschild
WO2013029980A1 (fr) * 2011-08-31 2013-03-07 Siemens Aktiengesellschaft Procédé de fabrication de céramiques réfractaires pour installations de turbine à gaz
EP3120982A2 (fr) 2011-08-31 2017-01-25 Siemens Aktiengesellschaft Procédé de fabrication de céramiques réfractaires pour des installations à turbines à gaz
EP3120982A3 (fr) * 2011-08-31 2017-03-08 Siemens Aktiengesellschaft Procédé de fabrication de céramiques réfractaires pour des installations à turbines à gaz

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US20070007426A1 (en) 2007-01-11
US7306194B2 (en) 2007-12-11

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