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Metal Casting Technologies : March 2006
casting. Heavy sections of the casting usually form a stable metal skin, whereas thin walls and especially the ingate start to freeze quickly. For this reason, feeding can only be used as a compensation of the shortfall in volume if the ingates are thicker than the wall of the casting, where further feeding is necessary (excep- tion here is local squeezing). The simulation allows an easy deter- mination of areas where solidification shrinkage can lead to volume errors (S. Kluge, 1999). The simplest criterion is the solidification time (Fig. 12). The possibility to partially compensate the solidification shrinkage by feeding with the plunger or with the local squeezer can also be displayed (Fig. 13). Figure 11 Figure 12 Figure 13 Figure 14 www.metals.rala.com.au