Part radius are extremely important in die castings and often neglected by component designers.
  To avoid high stress concentrations in the component and the die casting tool, fillet radii of the appropriate size must be
  used in all internal and external component edges.
  The exception to this rule is where the feature lands on the parting line of the tool.
  Another important aspect concerning fillet radii is that they assist in filling the part die.
 
 
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