FIELD: process engineering.
SUBSTANCE: invention relates to metallurgy. Hard alloy plates or inserts of sintered ceramic are fitted in slots of pattern made from foamed polystyrene. Finished patterns with inserted plates are integrated into pattern units, painted with gastight anti-burn-in dye and dried. Prior to melt teeming, pattern units are arranged in flask, filled with loose sand, compacted by vibration, sealed and evacuated.
EFFECT: variable-structure transition layer in pattern filling.
7 cl, 3 ex
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