The inclinations and corner radii applied to ribs are designed for enhancing both stiffness and aesthetics. The presence of inclinations and corner radii applied to ribs modifies the conditions of heat transmission and implicitly the solidification of the alloy in the joining area of the rib to the part wall. This is highlighted by changing the radius of circles inscribed in the wall -rib joining area. The diameter of the circles inscribed in this area is greater than of those in rest of the part wall. This leads to the assumption that the solidification of the alloy in the wall-rib joining area is slowed. The paper presents the results of a study concerning the influence of inclinations and corner radii applied to ribs on the duration of cast part solidification and on the position of the hot spots. The study was conducted by computer simulation of solidification. The results have revealed, that in certain limits this influence is negligible. The limits from which the influence becomes significant are determined.
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