INSTALLATION FOR MULTIPLE-GROOVE ROLLING OF MERCHANT BARS Russian patent published in 2003 - IPC

FIELD: rolled stock production, namely apparatuses for slitting rolled pieces, possibly in bar rolling mills using technique for rolling-slitting. SUBSTANCE: installation includes grooved working rolls forming grooved pass for making non-separated multistrand round cross section rolled piece and apparatus arranged according to manufacturing process after working rolls for slitting rolled piece. Said apparatus includes slitting rollers in the form of bodies of revolution having in their central portion ridges forming grooved passes and working surfaces in the form of lateral generatrix surfaces of straight truncated cones arranged at both sides of grooves of ridges and adjoined to them by large bases. Grooved pass in central portion of ridges of slitting rollers is box type one; it has outlet portions of lateral faces of working surfaces consisting 30-40%. Installation may include additional pair of rolls mounted between working rolls and main pair of slitting rollers. Geometry parameters of grooved pass formed in central portion of ridges of additional pair of slitting rollers correspond to those of grooved pass of main pair of slitting rollers. Angles between generatrix of lateral working surfaces of grooved pass and lateral working surfaces of straight truncated cones arranged at both side relative to it consist 0.65 - 0.75 of respective angles of main pair of slitting rollers. EFFECT: lowered load of rollers of slitting apparatus and effort for pushing rolled piece through it, possibility for keeping lengthwise stability in zone "working rolls - slitting apparatus", enhanced quality of rolled bars due to prevention of flaw occurring on surface of three separated rolled bars. 2 cl, 4 dwg