A cast ductile iron part for control arm. The foundry originally approached the feeding design for this casting by placing two symmetrical feeders, but that arrangement produced excessive porosity in the part, and no acceptable castings were produced with that arrangement.
Many iron foundries do not take into account the solidification characteristics of iron when designing feeding systems; feeders for iron castings are designed essentially as feeders for steel castings, resulting in defects in production castings. Often the suggested remedies for these defects worsen the situation, due to the same lack of understanding. The design methods are generally quite easy to implement and require only a minimal investment of time. Most of these problems could ...
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