COLD ROLL-FORMED STRUCTURES AND METHOD AND APPARATUS FOR PRODUCING SAME

摘要

Equipment to produce shaped metal strip from initially flat stock comprises a number of roll forming stands arranged in tandem and preferably operating at room temp. The rolls are frustoconical in shape, and each stand has two upper rolls working against the inclined surfaces of a single lower roll. This roll disposition deforms the strip by a shearing action along the inclined surfaces, and produces a channel-shaped cross-section. The shearing action reduces the thickness of the inclined portions of the strip by an amt. which depends upon the cone angle of the rolls. If T1 denotes initial strip thickness, T2 denotes deformed strip thickness and A denotes the cone angle (usually about 30 degrees), the preferred minimum value of T2 is defined by the relationship T2 = T1 sinA. -