Abstract: This invention improves on the process of bending in a conventional progressive stamping press a flat laminated metal sheet around a corner edge of a die block to form a generally straight piece-part corner, and comprises the steps of forming extended concavely rounded depressions in the opposite sheet faces at the sheet locations of the intended corner, then locating and clamping the sheet with the depressed regions aligned along a die block corner, and then mechanically bending the sheet with said depressed sheet regions aligned over the die block corner edge. The sheet depressions can be aligned essentially opposite one another, being rounded concavely and of a high width-to-depth ratio and of a depth to reduce the sheet to between 80-30% of its original thickness.