Excerpt from TheMetalCasting.com article.
Pattern, mold and core design involves orientation and parting. The parting line is influenced by designs of patterns and cores, number of voids in the mold, location of feeders, orientation of the part and locations of channels of gating, cooling and venting.
Orientation and parting line
A parting line is usually defined as the part of the mold that divides the segments to create cavities with the mold section and remove the final product from its mold as in die casting.
Factors which determine the number of parting lines required are:
- Geometry of the component to be molded
- Number of cavities required within the mold sections
- The nature of the runner system
- The kind of gating required and
- The method of ejecting the final product from its mold