1. Apparatus for forming metal articles by rolling, comprising a forming roll having working surface means, back-up rolls on which the forming roll is rotatably mounted, a die roll formed with a peripheral recess having working surface means, the forming roll fitting closely into the recess and defining therewith a working space in which a workpiece may be shaped by the two working surface means, and containment means comprised by a plurality of jacks providEd with pressure pads acting on the end faces of said die roll.

2. Apparatus for forming metal channels by rolling from bar stock, comprising a forming roll having a working surface characterized by an enlarged central portion having a cylindrical peripheral surface terminating in first side surfaces substantially perpendicular to the axis of the forming roll, said forming roll having a pair of surfaces extending outwardly from said first side surfaces and terminating in second side surfaces substantially perpendicular to the axis of the forming roll, back-up rolls on which the forming roll is rotatably mounted in line contact, and a die roll having a peripheral recess complementary in shape to, but larger than, said enlarged central portion and in which said enlarged central portion is disposed, said peripheral recess being bounded endwise by end walls substantially perpendicular to the axis of the die roll and spaced apart a distance to receive said second side surfaces closely therebetween, whereby said forming roll and die define between them a rolling recess in which bar stock may be cold rolled to a channel of the desired and accurate cross section.