The gravity casting is a casting method wherein the melt under the effect of gravity into the mold passes. It is the standard method in casting and is therefore usually not specifically mentioned. An exception is gravity die casting , to distinguish it from other casting processes with dies. The two alternatives are spin casting with centrifugal force and die casting with piston pressure.
During gravity casting , the molds must have openings at the top so that the air that is in the mold before the casting can escape. The melt can either be poured directly into the mold and fall into it from above (falling mold filling). Usually a separate gate system is used in which the melt first falls down in the gate and then flows laterally into the cavity that contains the workpiece after solidification (increasing mold filling). The form filling takes place here according to the principle of communicating tubes . The molds themselves can consist of sand ( sand mold ) or metal ( mold , permanent mold).
- Alfred Herbert Fritz, Günter Schulze (ed.): Manufacturing technology. 11th edition, Springer Vieweg 2015, ISBN 978-3-662-46554-7 , pp. 13, 80.