Method of bending metal sheets and a bending apparatus

摘要

Metal sheets, and in particular, metal sheets for roofing of the kind having upstanding flat edges ending with beads, are bent by rolling the flat edges such that they become gradually thinner towards the beads. The sheets will also be bent if the beads are not rolled. Metal sheets having upstanding sides, and ends bent towards or away from the upstanding sides, are also bent by rolling the upstanding sides gradually thinner towards or away from the bent ends for forming beams for automotive components as well as other products.

主权项

1. A method of bending a metal sheet that has upstanding sides extending from a central portion, each of said upstanding sides terminating in a bent end, the steps of said method comprising:
thinning at least one said upstanding side in a predetermined direction relative to said central portion without thinning said bent end of said at least one upstanding side before, during, and after said at least one upstanding side is thinned, for bending said metal sheet.