| 摘要 |
An assembly (10) for making a wax pattern of a hollow component comprises a pattern die (12) and a non circular core (14) which is located within the pattern die (12). The pattern die (12) is a split die and comprises two halves (16,18) which have shaped internal surfaces (20) to define the external shape of the wax pattern of the hollow component. The core (14) has shaped external surfaces (22,24) which define the internal shape of the wax pattern of the hollow component. The core (14) has coaxial circular cross-section projections (26,28) which locate within correspondingly shaped and dimensioned apertures (32,34) in the pattern die (12). One of the apertures (32) in the pattern die (12) has a radially extending pin (40) which is arranged to mate in a groove (38) on the projection (26) to locate the core (14) longitudinally. The core (14) is allowed to rotate within the die (12) so that chaplets (42) on the core (14) position the core (14) accurately without imposing strains on the core (14). <IMAGE>
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