Patent ID: 8453487
Filing Date: 2013-06-04
Classification: B21D,C23C

Abstract:
1. A method of making metal target blank using circular groove pressing comprising the steps of: a. pressing a metal or metal alloy target blank in a first circular grooved pressing die set into a first concentric corrugated shape while maintaining an original diameter of the target blank to create concentric rings of shear deformation in the target blank; b. applying forces to the concentric corrugated target blank sufficient to substantially flatten the target blank with a flat die set while maintaining the original diameter of the target blank to restore the target blank to a substantially flat condition; c. pressing the target blank in a second circular grooved die set into a second concentric corrugated shape while maintaining the original diameter of the target blank, wherein the second die set has a groove pattern offset from a groove pattern of the first die set so as to create concentric rings of shear deformation in areas of the target blank which were not deformed in step a); and d. applying forces to the concentric corrugated target blank sufficient to substantially flatten the target blank with a flat die set while maintaining the original diameter of the target blank to restore the target blank to a substantially flat condition.