Skin passageway trip strips

A die for molding a casting core, the die having a closed condition and an open condition and comprising:

• a chamber formed by surfaces of a first piece and a second piece in the closed condition having a plurality of sections for molding respective legs of the casting core;
• and
• a pull direction for separating the first and second pieces from each other to release a molded casting core,
• wherein:
• for each chamber section, a parting line extends across the section between junctions of the first and second pieces;
• for each chamber section:
• a face of the first piece has a longitudinally spaced plurality of protrusions;
• a pair of lateral rounded transitions extend from the first face toward the second piece;
• the protrusions have a height profile having:
• at least a first tapering portion;
• first and second inwardly concave terminal transitions to or past the lateral rounded transitions;
• a minimum difference (D) between a height of the protrusions and a height of the parting line away from the first and second inwardly concave transitions being not more than 200 micrometers;
• a difference (D) between a terminal height of the concave transitions and a height of the parting line is not more than 200 micrometers.

A die for molding a casting core, the die having a closed condition and an open condition and comprising:

• a chamber formed by surfaces of a first piece and a second piece in the closed condition having a plurality of sections for molding respective legs of the casting core;
• and
• a pull direction for separating the first and second pieces from each other to release a molded casting core,
• wherein:
• for each chamber section, a parting line extends across the section between junctions of the first and second pieces;
• for each chamber section:
• a face of the first piece has a longitudinally spaced plurality of protrusions;
• a pair of lateral rounded transitions extend from the first face into the second piece;
• the protrusions have a height profile having:
• first and second tapering portions tapering from a maximum height;
• first and second inwardly concave transitions to the lateral rounded transitions;
• a difference (D) between a maximum height of the protrusions and a height of the parting line being not more than 200 micrometers;
• a difference (D) between a terminal height of the concave transitions and a height of the parting line is not more than 200 micrometers.