DE3900205A1 - Water-soluble cores for forming cavity chambers or cavity body components in non-ferrous castings - Google Patents

Water-soluble cores for forming cavity chambers or cavity body components in non-ferrous castings

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Publication number
DE3900205A1
DE3900205A1 DE19893900205 DE3900205A DE3900205A1 DE 3900205 A1 DE3900205 A1 DE 3900205A1 DE 19893900205 DE19893900205 DE 19893900205 DE 3900205 A DE3900205 A DE 3900205A DE 3900205 A1 DE3900205 A1 DE 3900205A1
Authority
DE
Germany
Prior art keywords
cores
water
soluble
components
temperature
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Withdrawn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
DE19893900205
Other languages
German (de)
Inventor
Des Erfinders Auf Nennung Verzicht
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19893900205 priority Critical patent/DE3900205A1/en
Publication of DE3900205A1 publication Critical patent/DE3900205A1/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Withdrawn legal-status Critical Current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
    • B22C9/105—Salt cores

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

Hitherto used cores of lithogenic components, bonded with resins, starches and carbon dioxide, are consolidated under the action of temperature and pressure. The destruction therefore becomes very involved. As a result of the preparation by means of compression-moulding processes, less than optimum contours must sometimes be accepted. The object is achieved by forming lithogenic core materials with water-soluble binders into cores which ensure a high initial stability which they lose under the influence of pressure and temperature. At the same time cores can thus be produced by foundry technology, the core components used being re-usable by addition of water and binder. Water-soluble cores are particularly suitable for the formation of cavity chambers which are accessible only via small orifices and in the case of which the conventional elimination processes are very involved.

Description

Die Erfindung betrifft einen wasserlöslichen Kern mit variabel zu definierender Anfangsstabilität, die im Laufe des Gießprozesses durch Einwirkung von Druck und Temperatur nachläßt, sodaß sich der Kern am Ende des Gießprozesses durch geringe Krafteinwirkung in staubförmige Komponenten zerlegen läßt, bzw. ohne äußere Krafteinwirkung durch Wasser ausspülbar ist. Die Anfangsstabilität ist dabei so variabel definier­ bar, daß sie durch Veränderung einer einzelnen Kompo­ nente problemlos den realen Prozeßparametern Tempera­ tur und Druck angepaßt werden kann. Diese Stabilität kann somit zugleich auf ein Mindestmaß beschränkt werden, um Zerstörbarkeit bzw. Löslichkeit der Kerne zu beschleunigen und zu erleichtern. Die Kernkompo­ nenten haben keinerlei negative Auswirkung auf die Gießwerkstoffe. Die Herstellung der Kerne kann dabei nicht nur durch alle formgebenden Preßverfahren sondern auch mit einfachen Mitteln gießtechnisch erfolgen.The invention relates to a water-soluble core with variably definable initial stability, the in the course of the casting process by exposure to pressure and temperature decreases, so that the core ends up of the casting process by applying little force dust-like components can be disassembled, or without external force can be rinsed out by water. The initial stability is variably defined bar that by changing a single compo easily match the real process parameters tempera ture and pressure can be adjusted. This stability can thus be kept to a minimum the destructibility or solubility of the nuclei to accelerate and facilitate. The core compo nents have no negative impact on the Casting materials. The production of the cores can not only through all shaping pressing processes but also with simple means of casting technology respectively.

Es ist bekannt, daß im NE-Metallgußbereich lithogene Komponenten mittels Stärken, Kohlendioxid, Kieselguren und Zweikomponentenbindern - wie Phenolharz und Diä­ thylamin - zu Kernen geformt werden, die den hohen Drücken und Temperaturen während des Gießprozesses standhalten. Der Nachteil besteht darin, daß die Stabilität der Kerne durch Druck und Temperatur noch verstärkt wird und die Zerstörung damit sehr aufwendig wird. It is known that in the non-ferrous metal casting area, lithogenic components using starches, carbon dioxide, diatomaceous earth and two-component binders - such as phenolic resin and diethylamine - are formed into cores which can withstand the high pressures and temperatures during the casting process. The disadvantage is that the stability of the cores is further increased by pressure and temperature and the destruction is therefore very expensive.

Der Erfindung liegt die Aufgabe zugrunde, Kerne herzu­ stellen,The object of the invention is to use cores put,

  • - deren Anfangsstabilität problemlos an die Prozeß­ parameter angepaßt werden kann- The initial stability of the process without problems parameters can be adjusted
  • - die am Ende des Gießprozesses ohne technischen Aufwand in staubförmige Komponenten zerlegt werden können- those at the end of the casting process without technical Effort broken down into dust-like components can be
  • - die die Werkstoffeigenschaft nicht negativ beeinflussen,- which the material property is not negative influence,
  • - die leicht zerstörbar oder durch Wasser ausspülbar sind.- The easily destructible or rinsed out by water are.

Diese Aufgabe wird erfindungsmäßig dadurch gelöst, daß als Kernkomponenten lithogene Materialien eingesetzt werden, die im Bereich der keramischen Industrie seit langem Verwendung finden. Dies sind Kreide, Dolomit, Kaolin, Talkum, Quartz und andere Lithopone. Diese Mineralien verhalten sich gegenüber NE-Metallen neutral.This object is achieved according to the invention in that lithogenic materials used as core components be in the ceramic industry since long use. These are chalk, dolomite, Kaolin, talc, quartz and other lithopones. These Minerals behave towards non-ferrous metals neutral.

Um die notwendige Anfangsstabilität zu erreichen, werden diese unplastischen Materialien mit einem temporären Bindemittel für keramische Massen auf Quellmittelbasis gebunden. Dies gewährleistet durch seine Plastifizierungsfähigkeit zugleich eine leichte Formbarkeit der Kerne.In order to achieve the necessary initial stability, are these non-plastic materials with a temporary binder for ceramic masses Bound swelling agent base. This ensures due to its ability to plasticize one easy formability of the cores.

Darüberhinaus wird gewährleistet, daß die Kerne 100% wasserlöslich sind, und die Stabilität der Kerne mit zunehmender Prozeßdauer und Temperatur abnimmt, da diese Prozeßparameter eine Verflüchtigung des Binde­ mittels bewirken. It also ensures that the cores are 100% are water soluble, and with the stability of the cores increasing process time and temperature decreases because this process parameters a volatilization of the bandage by means of effect.  

Die mit der Erfindung erzielbaren Vorteile bestehen darin,The advantages that can be achieved with the invention exist in this,

  • - daß durch die einfache gießtechnische Herstellung der Kerne der Maschineneinsatz bei Komponentenauf­ bereitung und Formgebung erheblich verringert wird- That through the simple technical casting the core of the machine use for components preparation and shaping is significantly reduced
  • - die eingegossenen Kerne sich selbst über kleine Öffnungen mit Wasser ausspülen lassen und- the cast in cores over small ones Rinse openings with water and
  • - keine umwelt- und gesundheitsgefährdenden Komponenten, Binde- und Lösungsmittel verwendet werden.- no environmental and health hazards Components, binders and solvents used will.

Claims (1)

Wasserlösliche Kerne zur Ausbildung von Hohlkammern oder Hohlkörper-Komponenten in Nichteisen (NE)- Gußteilen, dadurch gekennzeichnet, daß die variabel definierbare Anfangsstabilität mit zunehmender Einwirkungszeit der Prozeß-Parameter Druck und Temperatur abgebaut wird und die Kerne am Ende des gießtechnischen Fertigungs­ prozesses leicht in staubförmige Komponenten zerlegt oder durch Wasser ausgespült werden können.Water-soluble cores for the formation of hollow chambers or hollow body components in non-ferrous (NE) castings, characterized in that the variably definable initial stability is reduced with increasing exposure time to the process parameters pressure and temperature and the cores easily become dusty at the end of the casting process Components can be disassembled or rinsed out with water.
DE19893900205 1989-01-05 1989-01-05 Water-soluble cores for forming cavity chambers or cavity body components in non-ferrous castings Withdrawn DE3900205A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19893900205 DE3900205A1 (en) 1989-01-05 1989-01-05 Water-soluble cores for forming cavity chambers or cavity body components in non-ferrous castings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19893900205 DE3900205A1 (en) 1989-01-05 1989-01-05 Water-soluble cores for forming cavity chambers or cavity body components in non-ferrous castings

Publications (1)

Publication Number Publication Date
DE3900205A1 true DE3900205A1 (en) 1990-07-12

Family

ID=6371622

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19893900205 Withdrawn DE3900205A1 (en) 1989-01-05 1989-01-05 Water-soluble cores for forming cavity chambers or cavity body components in non-ferrous castings

Country Status (1)

Country Link
DE (1) DE3900205A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19525307A1 (en) * 1995-07-12 1997-01-16 Eichenauer Gmbh & Co Kg F Casting core for molds

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19525307A1 (en) * 1995-07-12 1997-01-16 Eichenauer Gmbh & Co Kg F Casting core for molds
DE19525307C2 (en) * 1995-07-12 2003-04-03 Eichenauer Gmbh & Co Kg F Molding compound for the production of casting cores and method for producing a casting core

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