| 摘要 |
1508888 Shell moulds UNITED TECHNOLOGIES CORP 21 Aug 1975 [21 Aug 1974] 34755/75 Heading B5A A shell mould 44 is formed by casting or positioning on to a core element 18, with side flanges 24 and 25, wax patterns 26 and 27, and then dipping stuccoing and drying to form a refractory shell wall. The shell is then heated to harden the refractory coating and melt the wax to form a mould suitable for precision casting of opposed parts high-melting, metalalloy articles. |
