However, the sand core used there impedes the feeding, so that the critical area cannot be fed. By widening the feeding path, the critical area is sufficiently fed, thus preventing the defect. The foundrymen suggested reducing the size of the sand core to increase the feeding capacity.
MAGMASOFT® was used to remove successively three segments, 5, 10 and 15 mm wide respectively, from the left half of the sand core (Fig. 7) and simulate the solidification accordingly: When removing a 10 mm wide circle segment from the sand core, this should increase the feeding path and eliminate porosity in the casting. Problem solved, right? The machinist noted that the asymmetrical borehole applied uneven stress to the machining tool, leading to a too high wear of the tooling.