摘要 |
<p>PURPOSE: To provide a crucible former with which production of a casting free from casting defect and casting crack by intrusion of dust is possible. CONSTITUTION: This crucible former 11 includes a disk-shaped base plate 13 having a diameter slightly larger than the outside diameter of an embedded ring, a disk-shaped projecting part 14 having a diameter slightly larger than the bore of the embedded ring and a conical wax pattern implanting part 15 formed at approximately the center of an upper disk 14. The crucible former 11 is formed by integral molding of a polyurethane.</p> |