摘要:
An investment casting pattern is formed by forming a metallic first core element (50) including at least one recess (34). The first core element (50) is engaged to at least a mating one of an element (60) of a die and a second core element. The recess (34) serves to retain the first core element (50) relative to the mating one. The die is assembled and a sacrificial material is introduced to the die to at least partially embed the first core element. The recess (34) may be pre-formed prior to cutting the first core element (50) from a larger sheet of material.
摘要:
An at least two step heating process is used to strengthen the shell of an investment casting mold including a refractory metal core. The first stage (46) may occur under otherwise oxidizing conditions at a low enough temperature to avoid substantial core oxidation. The second stage (56) may occur under essentially non-oxidizing conditions at a higher temperature.
摘要:
An investment casting core comprises a ceramic core element (206) and a refractory metal core element (200) retained relative to the ceramic core element. A rod (209) partially embedded in the ceramic core element ( 206) extends through an aperture in the refractory metal core element (200).
摘要:
Pre-molding of wax or similar sacrificial material over one or more cores (20) facilitates a subsequent molding over a core assembly (110). Individual cores or groups thereof may be pre-molded in a wax body (90). One or more such wax bodies (90A, 90B, 90C) may be assembled with other bodies and/or other cores (110) to facilitate a main wax molding of such assembly in a die (112).
摘要:
An investment casting pattern is formed by forming a metallic first core element (50) including at least one recess (34). The first core element (50) is engaged to at least a mating one of an element (60) of a die and a second core element. The recess (34) serves to retain the first core element (50) relative to the mating one. The die is assembled and a sacrificial material is introduced to the die to at least partially embed the first core element. The recess (34) may be pre-formed prior to cutting the first core element (50) from a larger sheet of material.