METHOD FOR EVACUATION OF MOULDS AND DEVICE THEREFOR

摘要

FIELD: metal processing.SUBSTANCE: invention relates to metallurgy and can be used in casting grinding bodies in centrifugal machines with vertical rotation axis. Method is characterised by that above mold 6 with ventilation channels 12 is placed disk-like screen 5 to make slot-type channel 10. Screen is made with annular ledges 11 to make circular zones narrowing in slot-type channel above ventilation channels 12. Through slotted nozzle 9 is air cooling agent fed to periphery of slot channel 10. Above rotating mold vortex space of alternating low pressure is formed to create negative pressure in zones of narrowing of slot channel and exhaust of air and gases from mold.EFFECT: higher quality of casts due to elimination of gas porosity.2 cl, 1 dwg