Patent ID: 7331874
Filing Date: 2008-02-19
Classification: B21D

Abstract:
1. A method for producing washers by having upper molds and lower molds working on the top and bottom surfaces of a belt of material supported therebetween, said method comprising the steps of: forming at least two through holes in the middle of said belt which are used for positioning and guiding the subsequent process; forming a residual slot between every two adjacent said through holes, and an appropriately shaped ring thereby being appropriately shaped between every two adjacent said residual slots; forging a plurality of wedge planes around the bottom surface of each said ring by a said lower mold, and forging at least a V-shaped groove or a ridge radiating from said through hole on top surface of each said ring by a said upper mold; forming a larger through hole as the inner hole of a washer at the center of each said ring; forming the major shape of each washer without separating said washers from said belt; fine-tuning said washers to obtain the precise form factor and dimension; and separating said washers from said belt; wherein each of said rings is connected to the two edges of said belt by two legs, each of said legs is connected to the center of the outer edge of a said wedge plane, and each of said rings has a circular shape.