Minimizing porosity in cast Junctions

摘要

Casting modeling helped to create general design guidelines to improve the manufacturability of junctions in metal castings. Many casting defects that cannot be eliminated by changes to tooling and process parameters can be attributed to poor part design with respect to manufacturability. One common defect is shrinkage porosity occurring at casting junctions. Most castings can be viewed as an assembly of junctions. A casting junction is an abrupt increase in local thickness caused by two or more elements (walls) meeting together, resulting in regions of high thermal concentration. Molten metal cools slowly at junctions, leading to shrinkage porosity defects.