DE378308C - Process for producing a core binder for foundries using pitch, resin or the like. - Google Patents
Process for producing a core binder for foundries using pitch, resin or the like.Info
- Publication number
- DE378308C DE378308C DEH91530D DEH0091530D DE378308C DE 378308 C DE378308 C DE 378308C DE H91530 D DEH91530 D DE H91530D DE H0091530 D DEH0091530 D DE H0091530D DE 378308 C DE378308 C DE 378308C
- Authority
- DE
- Germany
- Prior art keywords
- pitch
- foundries
- resin
- producing
- core binder
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Developing Agents For Electrophotography (AREA)
Description
Verfahren zur Herstellung eines Kernbindemittels für Gießereien unter Verwendung von Pech, Harz o. dgl. Bisher war es meist üblich, die Peche, Harze usw. vor dem Mischen mit dem Sande zu mahlen, wobei die Mahlwerkzeuge verschmierten und das Mahlen nur bei trockenem Wetter erfolgen konnte, außerdem backt das gemahlene Pechpulver bei feuchter Witterung zusammen, so daß es vor dem Gebrauch wieder zermahlen werden muß. Da durch das Mahlen keine Staubfeinheit erreicht wird, weil die Neigung des Zusammenbackens größer wird, je feiner das Pulver gemahlen wird, so werden daher dem Sande auch größere Stückchen beigemischt, die dem Metall die Möglichkeit geben, den Kern anzufressen.Process for the production of a core binder for foundries under Use of pitch, resin or the like. Up to now it has mostly been customary to use the pitches, resins, etc. Before mixing with the sand to grind, the grinding tools smeared and the grinding could only be done in dry weather, in addition, the ground bakes Pitch powder together in damp weather, so that it is ground again before use must become. Since grinding does not produce any fineness of dust because of the inclination Therefore, the greater the caking, the finer the powder is ground, so will the sand is also mixed with larger pieces, which give the metal the possibility of to eat the core.
Es ist auch bereits ein Verfahren zur Herstellung von Kernen bekannt, bei welchem das dem Formsand beizumengende Bindemittel, wie Pech, Asphalt, Harze oder andere Bitumina, mittels Streudüsen oder Windsichter in feinste Pulverform gebracht werden, ehe sie dem Formsand beigemischt werden.A method for producing cores is also already known, in which the binder to be added to the molding sand, such as pitch, asphalt, resins or other bitumens, using scatter nozzles or air classifiers in the finest powder form be brought before they are mixed with the molding sand.
Für ein solches Verfahren mittels Streudüsen und Windsichter ist eine verhältnismäßig große Einrichtung nötig; die Düsen verstopfen leicht. . Eine besondere Auffangvorrichtung ist erforderlich oder eine Gegenluftstromvorrichtung.For such a method using scatter nozzles and air separators is one relatively large facility necessary; the nozzles clog easily. . A special Catcher is required or a counter air flow device.
Es ist nicht zu vermeiden, daß die zerstäubte Masse an den Wänden dieser Vorrichtung festklebt, so daß Verluste an Material eintreten müssen.It is inevitable that the atomized mass on the walls this device sticks so that losses of material must occur.
Das so entstehende Pulver besitzt auch vielfach nicht den erforderlichen Grad von Feinheit, weil seine Teile infolge des Zerstäubungsvorganges aus einzelnen Tröpfchen bei stehen.The resulting powder often does not have the required Degree of delicacy, because its parts are made up of individual parts as a result of the atomization process Droplets at stand.
Diese Nachteile werden durch das Verfahren nach vorliegender Erfindung beseitigt; es wird ein überaus feines Pulver geschaffen, welches sich leicht mit dem Formsand vermischen läßt und dabei den großen Vorteil aufweist, däß es nicht hygroskopisch ist und infolgedessen nicht zusammenbackt, sich daher auch längere Zeit aufbewahren läßt.These disadvantages are alleviated by the method of the present invention eliminated; an extremely fine powder is created, which can easily be mixed with lets mix the molding sand and has the great advantage that it does not is hygroscopic and as a result does not stick together, therefore it is longer Lets keep time.
Gemäß vorliegender Erfindung wird die Biturnenmasse in feinflüssigem Zustand derart auf eine von innen geheizte Trommel, die in langsame Umdrehung versetzt ist, geleitet, daß die Masse sich rasch über die Trommel-! fläche ausbreitet und nur ein hauchartiger Gberzug entsteht. Dieser wird sodann bei i der weiteren Drehung der Trommel durch ein feststehendes Messer von der Trommehwan-Jung abgeschabt und zerfällt dabei in ein Pul-'. ver von außerordentlicher Feinheit, welches sogleich so, wie es von der Trommel kommt, dem Sand beigemischt werden kann, ohne daß es erforderlich ist, .eine Siebung o. dgl. vorzunehmen.According to the present invention, the biturn mass is made into a fine liquid State so on an internally heated drum, which is set in slow rotation is directed, that the mass quickly over the drum! area spreads and only a puffy Gberzug arises. This is then at i the further rotation the drum is scraped off the Trommehwan-Jung by a fixed knife and breaks down into a pul- '. ver of extraordinary delicacy, which at once just as it comes from the drum, it can be mixed with the sand without it It is necessary to carry out a sieving or the like.
Selbstverständlich läßt sich das Pulver ohne weiteres auch in beliebigen Behältern aufbewahren und erst später-verwenden.Of course, the powder can also be used in any desired form Keep the containers and use them later.
Am besten eignet sich für dieses Verfahren Sttlfitlattge.Sttlfitlattge is best suited for this procedure.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEH91530D DE378308C (en) | 1922-10-26 | 1922-10-26 | Process for producing a core binder for foundries using pitch, resin or the like. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEH91530D DE378308C (en) | 1922-10-26 | 1922-10-26 | Process for producing a core binder for foundries using pitch, resin or the like. |
Publications (1)
Publication Number | Publication Date |
---|---|
DE378308C true DE378308C (en) | 1923-07-11 |
Family
ID=7166192
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEH91530D Expired DE378308C (en) | 1922-10-26 | 1922-10-26 | Process for producing a core binder for foundries using pitch, resin or the like. |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE378308C (en) |
-
1922
- 1922-10-26 DE DEH91530D patent/DE378308C/en not_active Expired
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