DE4023618C1 - Prodn. of shaped hollow body with undercuts etc. - by forming on core, of salt, isostatically pressed and machined to shape, plasma-sprayed coating of ceramic of metallic material - Google Patents

Prodn. of shaped hollow body with undercuts etc. - by forming on core, of salt, isostatically pressed and machined to shape, plasma-sprayed coating of ceramic of metallic material

Info

Publication number
DE4023618C1
DE4023618C1 DE19904023618 DE4023618A DE4023618C1 DE 4023618 C1 DE4023618 C1 DE 4023618C1 DE 19904023618 DE19904023618 DE 19904023618 DE 4023618 A DE4023618 A DE 4023618A DE 4023618 C1 DE4023618 C1 DE 4023618C1
Authority
DE
Germany
Prior art keywords
core
salt
hollow body
produced
plasma
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 - Lifetime
Application number
DE19904023618
Other languages
German (de)
Other versions
DE4023618C2 (en
Inventor
Claus 7000 Stuttgart De Bertsch
Juergen 7012 Fellbach De Traber
Joachim 7120 Bietigheim-Bissingen De Dutzek
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.)
Mercedes Benz Group AG
Original Assignee
Daimler Benz 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 Daimler Benz AG filed Critical Daimler Benz AG
Priority to DE19904023618 priority Critical patent/DE4023618C2/en
Application granted granted Critical
Publication of DE4023618C1 publication Critical patent/DE4023618C1/en
Publication of DE4023618C2 publication Critical patent/DE4023618C2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • B22C9/105—Salt cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
    • B22D23/003—Moulding by spraying metal on a surface

Abstract

Shaped hollow body is formed on a core, mfd. from salt, which is isostatically pressed and machined to the required shape. The core is coated by plasma spraying with ceramic or metallic material, building up a coherent wall of required thickness. The salt is then dissolved out of the body and is filtered and recovered by evapn. for re-use. ADVANTAGE - Ecologically satisfactory process allows undercuts etc. to be produced.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von Form­ hohlkörpern durch Aufspritzen des Materials auf einen Formkör­ per, nach dem Oberbegriff des 1. Patentanspruches, wie es aus der DE-AS 12 68 473 hervorgeht.The invention relates to a method for producing mold hollow bodies by spraying the material onto a molded body by, according to the preamble of the 1st claim, as it the DE-AS 12 68 473 emerges.

Nach der vorher angegebenen gattungsbildenden Druckschrift wer­ den bei der beanspruchten Verfahrensweise Formkörper verwendet, die ganz oder zum überwiegenden Teil aus Kohlenstoff herge­ stellt sind.According to the previously specified generic document the molded body used in the claimed procedure, which are wholly or mainly made of carbon represents are.

Aus der DE-PS 14 83 641 und der DE-AS 19 24 991 sind außerdem wasserlößliche Salzkerne für Gießmodelle bekannt, die aus Bo­ rax, Magnesiumoxid oder Talkum bestehen bzw. zusätzlich noch Wasserglas enthalten.From DE-PS 14 83 641 and DE-AS 19 24 991 are also water-soluble salt cores known for casting models, which from Bo rax, magnesium oxide or talc exist or additionally Water glass included.

Die Herstellung derartiger Kerne ist teilweise sehr aufwendig, Einschnürungen und Hinterschneidungen sind meistens nur mit geteilten Kernen auszuführen.The production of such cores is sometimes very complex, Constrictions and undercuts are usually only with split cores.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zur Herstellung von plasmagespritzten Formhohlkörpern zu fin­ den, das einfach in seiner Durchführung ist und mit dem bei dem Formhohlkörper beliebige Einschnürungen und Hinterschneidungen erreicht werden können. The invention is therefore based on the object of a method for the production of plasma-sprayed hollow moldings to fin the one that is easy to carry out and with that of the Molded hollow body any constrictions and undercuts can be achieved.  

Die gestellte Aufgabe wird erfindungsgemäß mit den Merkmalen des Patentanspruches 1 gelöst.The object is achieved according to the invention with the features of claim 1 solved.

Die Unteransprüche 2 bis 7 geben bevorzugte Ausführungsformen des erfindungsgemäßen Verfahrens an.The subclaims 2 to 7 give preferred embodiments of the method according to the invention.

In der Praxis werden bei dem erfindungsgemäßen Verfahren durch ein isostatisches Verpressen von Salz, insbesondere Kochsalz, direkt Formen oder Blöcke des Kerns mit angepaßten Kanten her­ gestellt. Die Formen oder Blöcke können durch eine entsprechen­ de Bearbeitung (Drehen, Fräsen, Bohren usw.) zu glatten Spritz­ kernen umgearbeitet werden. Zur Aufnahme bzw. Befestigung er­ halten sie einen Zapfen oder ein Loch. Da die Form nach dem Spritzen in einer Flüssigkeit, z. B. Wasser, aufgelöst wird, können soweit es bei Plasmaspritzen durchführbar ist, beliebige Einschnürungen bzw. Hinterschneidungen vorgesehen werden. Diese einfach herstellbare Form wird nur einmal verwendet; vergleich­ bar mit einem Sandkern in der Gießereitechnik. Auf diese Weise können sehr kostengünstig sowohl einmalig benötigte Teile als auch Serien hergestellt werden.In practice, in the method according to the invention isostatic pressing of salt, in particular table salt, directly forms or blocks of the core with adapted edges posed. The shapes or blocks can correspond by one de Machining (turning, milling, drilling, etc.) to smooth spray cores to be reworked. For mounting or mounting it hold a peg or hole. Since the shape after Syringes in a liquid, e.g. B. water is dissolved, can, as far as it is feasible with plasma spraying, any Constrictions or undercuts are provided. These easy to manufacture form is used only once; comparison bar with a sand core in foundry technology. In this way can be used both as one-off parts very cost-effectively series can also be produced.

Das Salz ist direkt bespritzbar mit keramischen und metalli­ schen Werkstoffen und sogar mit gewissen Kunststoffen.The salt can be sprayed directly with ceramic and metallic materials and even with certain plastics.

Das erfindungsgemäße Herstellungsverfahren erweist sich als ökologisch unbedenklich. Es entstehen keine Schadstoffe und das verwendete Salz kann auf einfache Weise mittels eines Filter­ vorganges und anschließendes Ausdampfen zurückgewonnen werden.The manufacturing method according to the invention proves to be ecologically harmless. There are no pollutants and that Salt used can be easily removed using a filter process and subsequent evaporation can be recovered.

Die Vorteile des erfindungsgemäßen Verfahrens bestehen insbe­ sondere darin, daß bei dem Formhohlkörper Hinterschneidungen in beliebiger Form zugelassen werden können, der Kern rückstand­ frei und gewaltfrei entfernt werden kann, der Kern an dem Form­ hohlkörper eine glatte Hohlkörperfläche hinterläßt, und wobei das aufgespritzte Material gut haftet und sauber bleibt. Das Verfahren ist ökologisch unbedenklich, da keine Schadstoffe entstehen.The advantages of the method according to the invention are in particular special in that undercuts in the mold hollow body any shape can be allowed, the core residue the core of the mold can be removed freely and without violence hollow body leaves a smooth hollow body surface, and wherein  the sprayed material adheres well and remains clean. The The process is ecologically harmless because there are no pollutants arise.

Claims (7)

1. Verfahren zur Herstellung von Hohlkörpern, bei dem ein schmelz­ fähiger Werkstoff in einer heißen Zone, insbesondere in einer Plasmazone aufgeschmolzen, zerstäubt und in zerstäubter Form auf einen Kern aufgespritzt wird, wobei die auf den Kern sich niederschlagenden Partikel zu einer zusammenhängenden Wandung zusammensintern, wobei örtlich gezielt das Spritzen solange fortgesetzt wird, bis die jeweils gewünschte Wandstärke er­ reicht ist und nach Fertigstellung der Formhohlkörperwandung der Kern aus dem Hohlkörper entfernt wird, dadurch gekennzeichnet, daß der Kern aus einem Salz hergestellt wird und dieses nach der Bildung des Formhohlkörpers in einem Lösungsmittel aufge­ löst wird.1. A process for the production of hollow bodies, in which a meltable material is melted, atomized and sprayed onto a core in a hot zone, in particular in a plasma zone, the particles depositing on the core sintering into a coherent wall, where locally the spraying is continued until the desired wall thickness is sufficient and after completion of the mold hollow body the core is removed from the hollow body, characterized in that the core is produced from a salt and this after the formation of the mold hollow body in one Solvent is dissolved. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Kern aus Kochsalz mit oder ohne Zumischungen herge­ stellt wird und in Wasser aufgelöst wird.2. The method according to claim 1, characterized, that the core of table salt with or without admixtures is placed and dissolved in water. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Kern durch ein isostatisches Verpressen eines Salzes hergestellt wird.3. The method according to claim 1 or 2, characterized, that the core by isostatic pressing of a salt will be produced. 4. Verfahren nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß die Form des Salzkernes aus einem gepreßten Salzblock mit­ tels bekannter Bearbeitungsverfahren (Drehen, Fräsen, Bohren, Schleifen oder Schmirgeln) hergestellt wird.4. The method according to claim 1, 2 or 3, characterized,  that the shape of the salt core from a pressed salt block with known machining processes (turning, milling, drilling, Grinding or sanding) is produced. 5. Verfahren nach Anspruch 1 bis 4, dadurch gekennzeichnet, daß der nach der Bildung des Formhohlkörpers aus dem Hohlkörper herausgelöste Salzkern als Sole gefiltert, das Filtrat einge­ dampft und das Salz zurückgewonnen wird.5. The method according to claim 1 to 4, characterized, that after the formation of the mold hollow body from the hollow body The salt core that has been extracted is filtered as brine and the filtrate is added vapors and the salt is recovered. 6. Verfahren nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß mit dem Flamm- oder Plasmaspritzverfahren Formhohlkörper aus Metall, Hartmetall, Keramik oder aus Kunststoff hergestellt werden.6. The method according to one or more of claims 1 to 5, characterized, that with the flame or plasma spraying mold hollow body made of metal, hard metal, ceramic or plastic will. 7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß mit Einschnürungen und/oder Hinterschneidungen versehene Formhohlkörper hergestellt werden.7. The method according to claim 6, characterized, that provided with constrictions and / or undercuts Molded hollow body can be produced.
DE19904023618 1990-07-25 1990-07-25 Process for the production of hollow moldings by plasma spraying Expired - Fee Related DE4023618C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19904023618 DE4023618C2 (en) 1990-07-25 1990-07-25 Process for the production of hollow moldings by plasma spraying

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19904023618 DE4023618C2 (en) 1990-07-25 1990-07-25 Process for the production of hollow moldings by plasma spraying

Publications (2)

Publication Number Publication Date
DE4023618C1 true DE4023618C1 (en) 1991-06-27
DE4023618C2 DE4023618C2 (en) 1993-11-18

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0927816A3 (en) * 1997-12-29 2000-04-19 Ford Global Technologies, Inc. Method of making spray-formed inserts
DE102009037893A1 (en) 2009-08-18 2011-02-24 Mtu Aero Engines Gmbh Producing hollow body with cavity, comprises producing molded body with outer mold partially having shape of hollow cavity, where molded body is displaceable by solvent/melt in flowable state, and coating molded body with coating material
FR2969516A1 (en) * 2010-12-23 2012-06-29 Saint Jean Ind PROCESS FOR THE PRODUCTION OF SALT CORE BY ISOSTATIC COMPACTION UILIZABLE IN FOUNDRY OR FOUNDRY-FORGING

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1268473B (en) * 1965-07-09 1968-05-16 Metallgesellschaft Ag Process for the production of molded hollow bodies from metals and alloys, preferably hard metal alloys, by spraying onto molded bodies
DE1483641C3 (en) * 1965-06-12 1973-10-11 Karl Schmidt Gmbh, 7107 Neckarsulm Water-soluble salt cores
DE1924991B2 (en) * 1969-05-16 1977-11-03 Karl Schmidt Gmbh, 7107 Neckarsulm WATER-SOLUBLE SALT CORN
US4529615A (en) * 1982-10-11 1985-07-16 Ceskoslovenska Akademie Ved Method of producing self-supporting constructional elements
FR2559506A1 (en) * 1984-02-14 1985-08-16 Reparation Mat Aero Const Process for the production of hollow components by plasma spraying

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1483641C3 (en) * 1965-06-12 1973-10-11 Karl Schmidt Gmbh, 7107 Neckarsulm Water-soluble salt cores
DE1268473B (en) * 1965-07-09 1968-05-16 Metallgesellschaft Ag Process for the production of molded hollow bodies from metals and alloys, preferably hard metal alloys, by spraying onto molded bodies
DE1924991B2 (en) * 1969-05-16 1977-11-03 Karl Schmidt Gmbh, 7107 Neckarsulm WATER-SOLUBLE SALT CORN
US4529615A (en) * 1982-10-11 1985-07-16 Ceskoslovenska Akademie Ved Method of producing self-supporting constructional elements
FR2559506A1 (en) * 1984-02-14 1985-08-16 Reparation Mat Aero Const Process for the production of hollow components by plasma spraying

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Preprints des Nederlands Institut voor Lastechiek,General Aspects of Thermal Spraying, 9. Inter- national Thermal Spraying Conference, The Hague, 19.-23. Mai 1980 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0927816A3 (en) * 1997-12-29 2000-04-19 Ford Global Technologies, Inc. Method of making spray-formed inserts
DE102009037893A1 (en) 2009-08-18 2011-02-24 Mtu Aero Engines Gmbh Producing hollow body with cavity, comprises producing molded body with outer mold partially having shape of hollow cavity, where molded body is displaceable by solvent/melt in flowable state, and coating molded body with coating material
FR2969516A1 (en) * 2010-12-23 2012-06-29 Saint Jean Ind PROCESS FOR THE PRODUCTION OF SALT CORE BY ISOSTATIC COMPACTION UILIZABLE IN FOUNDRY OR FOUNDRY-FORGING
CN103347625A (en) * 2010-12-23 2013-10-09 圣让工业公司 Process for manufacturing salt core by isostatic compaction for part implementing successive foundry and forging operation
CN103347625B (en) * 2010-12-23 2015-11-25 圣让工业公司 The manufacture method of the salt core of continuous casting and forging operation is realized by the parts of isostatic compaction

Also Published As

Publication number Publication date
DE4023618C2 (en) 1993-11-18

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Date Code Title Description
8100 Publication of the examined application without publication of unexamined application
D1 Grant (no unexamined application published) patent law 81
8363 Opposition against the patent
8366 Restricted maintained after opposition proceedings
8305 Restricted maintenance of patent after opposition
D3 Patent maintained restricted (no unexamined application published)
8327 Change in the person/name/address of the patent owner

Owner name: DAIMLERCHRYSLER AG, 70567 STUTTGART, DE

8320 Willingness to grant licenses declared (paragraph 23)
8339 Ceased/non-payment of the annual fee