METHOD OF GRAPHITISING MODIFICATION OF FREY IRON AT FILLING OF MOULDS FROM LADLE Russian patent published in 2015 - IPC C21C1/08 B22D27/20 

FIELD: process engineering.

SUBSTANCE: invention can be used in machine building and automotive industry for productions of casts of high-strength cast iron with spherical and vermicular shape of graphite. Proposed process comprises draining the iron melt from furnace into ladle, measurement of melt temperature therein, filling the first mould with iron melt simultaneously with graphitising modification. Modification degree is defined by the width of semi-chilled iron zone at the fracture of wedge sample. Note here that in case said sample complies with standard for particular casting, said iron melt is further poured from ladle to moulds with feed of preset modifying agent weight to the jet with allowance for interruption of its feed before filling of riser and pouring cup of every mould. In case semi-chilled iron zone does not comply with said standard, the first mould is isolated and disposed. Then, iron temperature in ladle is measured again and in case semi-chilled iron zone does not comply with said standard, melt is drained from ladle to be refilled from the furnace. Consumption of said modifying agent is corrected to fill the next mould and to define the modification degree another time.

EFFECT: decreased consumption of graphitising modifying agent.