Patent ID: 7621168
Filing Date: 2009-11-24
Classification: B21D,Y10T

Abstract:
1. A method for producing hexagonal 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 first residual slot between every two adjacent said through holes; forming a second residual slot and a third residual slot at corresponding locations along the two sides of every said first residual slot, thereby forming a hexagonal ring around each said through hole; forming 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 the 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.