LOST FOAM PROCESS AND INSTALLATION

In a lost foam process in which a complete, positive pattern of a thermally decomposable material is inserted into a flask containing sand, the sand is compacted by vibration. The casting metal is poured onto the thermally decomposable pattern, and the pattern is decomposed by casting heat. … So that shaped pieces having critical hollow spaces can be reliably moulded by the moulding sand and filled up with the same, the sand, while being poured in, is subjected to vacuum in order to enclose the pattern. The filling of the flask with sand and the compaction of the same is helped by the sand being vibrated at the same time as the vacuum is applied to it. ……