Method to control the deformations of the sidewalls of a crystalliser, and continuous-casting crystalliser

摘要

Method to control the deformations of the sidewalls of a crystalliser (11) for the continuous casting of billets/blooms /slabs (24), which is associated with a mould (10) and cooperates externally with a box-shaped structure (13) creating a cooling chamber (14), in which a cooling fluid circulates, and cooperates internally with the skin of the billets/blooms /slabs (24) being formed, the cooling chamber (14) containing an intermediate wall (20) creating a circulation channel (21) in cooperation with the outer surface of the sidewall (12) of the crystalliser (11), at least one upper zone (37) being included in cooperation at least with the vicinity of the meniscus and with the portion below the meniscus (27) of liquid metal, a lower zone (38) being also included and beginning in the vicinity of the zone of separation of the forming skin from the inner surface of the sidewall (12) of the crystalliser (11) and extending towards the outlet of the crystalliser (11), the pressure of the cooling fluid in the lower zone (38) of the crystalliser (11) being a function of the desired value (g1) of an air interspace (36) between the sidewall (12) of the crystalliser (11) and the skin of the forming billet/bloom/slab (24), this desired value of air interspace (36) tending towards a zero value.Crystalliser for the continuous casting of billets/blooms /slabs (24), which is associated with a mould (10) and cooperates externally with a box-shaped structure creating a cooling chamber (14), in which a cooling fluid circulates, and cooperates internally with the skin of the billet/bloom/slab (24) being formed, the cooling chamber (14) containing an intermediate wall (20) creating a circulation channel (21) in cooperation with the outer surface of the sidewalls (12) of the crystalliser (11), there being included at least one upper zone (37) cooperating at least with the vicinity of, and with the part below, the meniscus (27) of liquid metal, a lower zone (38) being also included and beginning in the vicinity of the zone of separation of the forming skin from the inner surface of the sidewall (12) of the crystalliser (11) and extending towards the outlet of the crystalliser (11), the crystalliser (11) carrying out the method of the claims hereinebfore, at least one longitudinal zone of one sidewall (12) of the crystalliser (11) having a thickness between 4 and 15 mm. correlated functionally with the pressure of feed or with the range of pressures of feed of the cooling fluid within the relative circulation channel (21) in relation to the required inward displacement of that sidewall (12).