Patent ID: 8365569
Filing Date: 2013-02-05
Classification: B21D

Abstract:
1. A method for producing three-dimensional attachments out of a flat strip, comprising: feeding in a feeding direction the flat strip into a first press tool; at the first press tool, executing at approximately a same time both a fine blanking operation to completely cut out a workpiece from the flat strip giving the cut out workpiece an outer contour and a forming operation for reshaping the workpiece so that a first side of the workpiece has said outer contour at a first height, an adjacent flat seating recessed from the first height, and at least one inner form having a height different than that of the flat seating, a first inner form of the at least one inner form including any of a projection or indentation contoured relative to the flat seating, wherein the outer contour is not deformed during said reshaping and orients the reshaping so that the at least one inner form is precisely located with reference to the outer contour, thereby avoiding distortion and impaired tolerances of the at least one inner form; conveying the workpiece into a second press tool; and at the second press tool, pressing into the workpiece burrs developed at least at the outer contour during cutting out of the flat strip, said workpiece being centered according to said outer contour and simultaneously oriented according to location of the at least one inner form which was formed into the workpiece, such that the burrs of the fine blanked surfaces are flattened directly in the second press tool, whereby a three-dimensional attachment is formed from the flat strip; and wherein said executing a fine blanking operation comprises completely cutting out a workpiece from the flat strip to provide the cut out workpiece with said outer contour, said outer contour being completely cut out of the flat strip to define an entire outer peripheral edge of the workpiece.