FIELD: foundry engineering. SUBSTANCE: pattern is covered with gasproof case before it is evacuated in the process of vacuum film moulding. Gasproof case is gradually removed from pattern after vacuum is created. In this case holes on pattern surface are released. These holes are connected with vacuum source. Gasproof film in the form of layers is deposited on the surface free from a case. Pattern is totally covered with film by means of depositing layer by layer from top to bottom and case is removed. Method provides high quality of large-sized ingots by means of forming precise stamp of pattern. EFFECT: improved quality. 4 dwg
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