| 摘要 |
<p>A process for fabricating a hollow or partially hollow article, such as a jewelry ring (1), comprises producing a first mold (10) having an inner cavity (16) shaped in accordance with the external shape of the article to be produced. A second mold (30) is produced for forming a wax core insert (50) which is inserted in the first mold cavity for forming the hollow region of the article. The second mold has an inner cavity (36) formed in the shape of, but slightly smaller than, the external shape of the article. The cavity of the second mold has holes (41, 42) which form spacer pins (56) on the wax core insert. The wax core insert is then placed in the cavity of the first mold and is maintained in a precise, predetermined position by the spacer pins. During waxing of the article, a plastiwax is introduced into and fills the cavity of the first mold, completely surrounding the wax core insert. The plastiwax hardens and is removed from the first mold cavity with the wax core insert. The wax core insert is then removed from the plastiwax article by suitable water soluble or chemical substance to form a hollow article. The plastiwax replica is then used to form a mold cavity in an investment material, which is used to cast the hollow metal article.</p> |
