Mould head for the vertical hot-top continuous casting of metal products elongate cross section

A mould head for the vertical hot-top continuous casting of metals, comprising a feed head made of a thermally insulating refractory, which fits on a cooled metal crystallizer of the mould head, being internally aligned with the latter in order to define a continuous and uniform passage for the cast metal, and comprising, between the feed head and the crystallizer, an inset made of a dense refractory material having mechanical strength properties and shaped so as to be flush with the internal periphery of the mould head, which mould head is characterized in that said insert comprises at least one bar, the bar being formed from a rigid assembly of juxtaposed and aligned contiguous elements which are kept clamped against each other by a clamping means incorporated into said bar and in that means for positioning and aligning said bar with the crystallizer of the mould head are provided and comprise a battery of pushers which are associated with a positioning stop on said crystallizer, against which stop is pressing the bar subjected for this purpose to the action of the pushers which permanently tend to push the bar back towards the inside of the mould head.