Patent ID: 6460393
Filing Date: 2002-10-08
Classification: B21D

Abstract:
A tool comprising a first and a second tool half, the tool having a dividing plane, wherein said tool halves have a plurality of convexity forming projections arranged along a straight line and separated by a plurality of spaces, said projections on said first tool half fitting into said spaces on said second tool half, and vice versa, wherein each tool half is provided with a pair of ejectors, with one said ejector disposed on each lateral side of the convexity forming projections of the tool half, each said ejector having a contact face which is situated in said dividing plane of the tool when said tool halves are brought completely together to firmly secure a main face of a plate body between said contact faces, so that the main face of said plate body is maintained in said dividing plane of the tool and secured between said ejectors throughout substantially the entire forming of convexities with said plurality of projections over a large area of the plate body, to prevent the plate body from twisting, wherein said projections on said first tool half are of a length, measured from a point in said dividing plane of the tool, across the top of said projection to a point in said dividing plane on the opposite side of said projection, which is equal to the corresponding length across said projections on said second tool half.