| 摘要 |
<p>Very large tools can be cast-to-size by making a pattern (8, 10, 12) of the article to be formed by the tool, laying the pattern (8, 10, 12) up in a pattern box (14), applying a release coat (18) and coating the pattern (8, 10, 12) and box (14) with a tough, curable tool surface layer (26). A small amount of epoxy resin (32) filled with a thermally-conductive particulate filler is cast into the pattern box (14) before the surface layer (26) fully cures. Relatively large chunks (28) of thermally-conductive material are added to the box (14) which are covered with additional cast epoxy resin (32). The cure of the epoxy resin (32) is controlled to effect complete cure at room temperature within a few days but never to exceed a peak cure temperature above about 70°C.</p> |
