Slush casting

Slush-casting alloys must be faidy low melting and freeze over a temperature range, that is, the Hquidus and soHdus temperatures must be significantly different to provide a slushy range. 

Zinc slush-casting alloy compositions are based on the Zn—A1 system. The two commonly used alloys have nominal aluminum contents of 4.75%... 

Slush casting, also called slush molding or cast molding, is extensively used. It is a method where TPs in a liquid form are poured into a hot mold that is stationary or moving where a viscous skin forms. The excess slush is drained off, the mold is cooled, and the molding stripped out. Used to produce rain or snow boats, auto instrument panels, over shoes, corrugated and non-corrugated complex tubes, caps, etc. 

Three important variations of the plastisol casting, are dip casting, slush casting, and rotational... 

Slush casting is similar to slip casting (drain) of ceramics. The liquid is poured into a preheated hollow metal mold, which has the shape of the outside of the object to be made (Figure 2.43b). The plastisol in immediate contact with the walls of the hot mold solidifies. The thickness of the cast is governed by the time of stay in the mold. After the desired time of casting is finished, the excess liquid is poured out and the solidified plastisol with the mold is kept in an oven at 350°F-400°F (176°C—204°C). The mold is then opened to remove the plastic part, which now bears on its outer side the pattern of the inner side of the... 

FIGURE 2.43 Plastisol casting processes (a) dip casting (b) slush casting (c) rotational casting. 

Electroformed mold n. A mold made by electroplating a model, which is subsequently removed from the metal deposit. The deposit is sometimes reinforced with cast or sprayed metal backings to increase its strength and rigidity. Such molds are used in slush casting of vinyl plastisols and other forming processes done at low pressures. 

Shell molding n. In metal foundries, a process of casting metal objects in thin molds made from sand or a ceramic powder mixed with a thermosetting-resin binder. Some authors have misused the term by equating it to plastics processes such as dipping and slush casting. 

Slush molding n. The preferred term for the process resembling slush casting but employing dry, sinterable powders. 

Totzeit, Durchflusszeit hollow casting/ hollow molding/ slush casting... 

Slush casting for creating hollow parts without cores in low melting point metals such as lead, zinc and copper alloys. 

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