FIELD: metallurgy.
SUBSTANCE: mould mandrel comprises hollow sleeve arranged at crossbar and having vertical coolant channels. Through vertical grooves are arranged regularly over sleeve bottom edges. Width of said vertical through grooves does not exceed 2 mm. Sleeve inner surface is shaped to polyhedron, every face being arranged between said vertical through grooves. At replacement of steel teeming ladle, blank drawing rate is increased. Besides, blank temperature decreases while shrinkage increases, both being compensated for by sleeve flake resilience. After recovery of casting initial parameters, blank surface temperature increases to decrease said shrinkage so that blank flakes acquire initial shape.
EFFECT: higher reliability and quality of cast hollow blanks.
4 dwg, 1 ex
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