Abstract: The process of our invention heats a plurality of partially finished products extruded in an extrusion unit or changed in a transforming unit as a preparation for introduction into subsequent transformation or processing units. In extruding and/or transforming or heating the heat applied to at least one partially finished product length group is transferred during intermediate transport of the partially finished product length group and/or during storage by heat transfer with other partially finished product length groups. The heat transfer is caused by radiation, convention and/or direct contact. An apparatus for performing the process according to our invention comprising a thermal insulating chamber provided with an air flow and air feed devices and if necessary an auxiliary heating unit is also provided.

Abstract: A star-shaped array of channeled rolls in a rolling mill for rolling bar stock has the rolls pressed together with a pressing force exceeding the rolling force by a prestressing force sufficient to cause frustoconical flanks of the rolls to forceably press against one another. This stabilizes the rolls and also permits a fine adjustment of the diameter of the passage defined between them.

Abstract: A pair of roll grooves defining a rolling passage for the bar stock in respective rolls having abutting or bearing portions which are undercut to increase elasticity and are separated from the grooves by recesses. The force with which the rolls are pressed against one another far exceeds the rolling force.