TOOL FOR CUTTING-THROUGH STEEL STRIPS Russian patent published in 1998 - IPC

FIELD: plastic metal working, namely manufacture of cold bent cut-through rolled shapes. SUBSTANCE: tool for cutting through steel strip with predetermined width B includes upper and lower rolls whose barrels are formed by separate members. Novelty is barrel of upper roll having length l= (0.30-0.35)B; barrel of lower roll has on its end portions cylinder-cone rims with inclination angle of cone portions relative to axis of roll equal to 80 degrees and it has circular cylindrical turning arranged non-symmetrically relative to mean line of barrel. Cutting through member of upper roll is arranged equidistantly relative to said turning and it has successively alternating dents and recesses along generatrix. Dents have rectangular cross section and they are chamfered by angle 28-32 degrees relative to their lateral faces. Ratio of dent width to width of flat portion of dent apexes is equal to (1.3-1.36). Width of turning consists (1.01-1.015) of that of cutting through member. EFFECT: simplified low-cost tool for cutting through steel strips at high quality of cut-through bent shapes. 1 dwg