Wax pattern molding process

In a wax pattern molding process, employing a mold having a cavity and a core means in the mold cavity, the core means comprising multiple core pieces, the steps that include

• a) closing the mold with the core means positioned in the mold cavity,
• b) providing and injecting flowing heated wax into the mold to flow about the core,
• c) allowing the injected wax to cool and solidify to form the wax pattern,
• d) removing the core means from the solidified wax pattern, by removing said core pieces one-by one in a removal direction, and while the mold holds the pattern in position in the mold, the core pieces having integral flanges located outside the cavity and said removing being accomplished by manipulation externally of said mold,
• e) and thereafter opening the mold and removing the wax pattern from the mold,
• f) the method including preliminarily positioning the core in the mold cavity, in wax pattern forming position, with metal-to-metal locating of the core relative to the mold,
• g) said positioning step including providing a stop shoulder on the mold, and wedging the flanges against the stop shoulder during said a) step,
• h) the method including removing the core pieces from the pattern in the mold, so that the pattern becomes a hollow shell supported in and by the mold, said core pieces having slidable interconnections, and said removing of the core pieces being carried out in said removal direction as accommodated by relative sliding of said interconnecting, there being at least four A, B, C, and D of said core pieces, and they are removed one-by-one in said direction, piece A removed first thereby forming a cavity and pieces B, C and D removed after movement thereof toward the cavity formed by removal of A.