PRODUCTION OF TAPERED CUPS BY SEQUENTIAL DEEP-DRAWING OF SHEET METALSUSING DRAWN CUPS AS A PART OF PUNCH

A new deep drawing process of sheet metals is developed to facilitate small-lot production of deep cups with large drawing ratio. In this pr ocess, unlike the conventional deep drawing method, a few drawn cups a re always stacked on the punch and used as a part of punch for the sub sequent deep drawing of a given blank. Before drawing a new blank, a d rawn cup which is in contact with the punch is stripped off. The repet ition of such stripping and drawing operations makes it possible to ca rry out both the first-stage drawing and the subsequent slight re-draw ings in one drawing operation using only one pair of punch and die. In this paper, this new deep drawing process is applied to the productio n of tapered cups and the main feature of the process is shown.