| 摘要 |
A mobile bottom closure/support includes a metal disc-shaped body, having at its top a suitable diameter for allowing the body to be translated inside a crystallizer-collar and having, at its bottom, a larger diameter. The disc-shaped body includes a pair of disc-shaped plates made from metal materials with different values of heat conductivity and concentrically superimposed to each other. The upper disc-shaped plate has at least a portion of its external cylindrical surface with such a diameter as to enable the plate to be translated inside the crystallizer-collar. The lower disc-shaped plate has a greater diameter, suitable for enabling the disc-shaped body to remain guided, coaxially with the collar, between vertical trueing elements angularly spaced apart from one another and integral with the collar. The base plane of the disc-shaped body is removably affixed to a planar surface support, vertically translatable in a known way, so as to enable the solidified shaped casting to be discharged while it is anchored to the upper plate.
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