FIELD: foundry engineering. SUBSTANCE: working surface of mould has three screens formed in their cross-section by semi-circles of different diameters. Angle between two straight lines within a cell is of 57-64 deg. Distance ratio between vertical axes of neighboring cells and vertical axis of a screen and adjoining cell is of 2,0-2,2. EFFECT: enhanced efficiency. 3 dwg, 1 tbl
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