摘要:
A wax or similar material (70) may be molded to a base plate (42) of an investment casting shelling fixture. The molding may provide for enhanced positioning of wax patterns (22; 230) or may provide a precise surface shape for the shell (24).
摘要:
An apparatus for shelling an investment casting pattern (22) has a tank (26) containing a coating material (28). There are means for holding the pattern immersed in the coating material. There may be means for vibrating the pattern during immersion of the pattern and a vacuum source (126) coupled to the tank to withdraw air from at least one headspace (79) of the tank.
摘要:
A slurry is used to secure a metallic casting core (212) to a ceramic casting core (210). The slurry may be introduced between the metallic and ceramic casting cores (212,210) and hardened. The slurry may comprise zircon and aqueous colloidal silica. Preferably the cores (210,212) are vibrated during the introduction, e.g. by a shaker table (202) which receives a fixture (204) for the cores (210,212).
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:
A pattern (20) with internal cores for creating a hollow component is composed of a first pattern half (10) having one or more first self-locating features (12); a second pattern half (16) having one or more second self-locating features (18); and one or more cores (14) disposed in contact with the one or more first self-locating features (12) and the one or more second self-locating features (18). The method for its manufacture includes the steps of creating a first pattern half (10) having one or more first self-locating features (12); creating a second pattern half (16) having one or more second self-locating features (18); providing one or more cores (14); and assembling the pattern (20) by engaging the one or more first self-locating features (12) and the one or more second self-locating features (18) about the one or more cores (14).