Patent ID: 6748787
Filing Date: 2004-06-15
Classification: B21C,B21J,B21K,H01R

Abstract:
A method of producing workpiece having irregular cross section by stamping thin plate into thick plate, in which a thin plate having a uniform thickness corresponding to that of a thinner area to be formed on said workpiece is used, said method comprising the following steps: securely positioning said thin plate in a mold cavity; preparing a series of sequentially arranged stamping heads having respective bevel surfaces of different bevel angles, so that said stamping heads could be sequentially shifted to align with a predetermined scrap area on said thin plate; using said stamping heads one by one to stamp said thin plate at said predetermined scrap area so that a part of said scrap area is gradually compressed and pushed toward a specific area that is to have larger thickness on said workpiece; keeping stamping said scrap area with said stamping heads having increased bevel angles until said specific area to have larger thickness bumps and reaches a predetermined thickness; using a stamping mold to downward stamp said bumped area into a predetermined shape; and stamping off said scrap area that has been partially stamped and thinned and other unused areas on said thin plate according to a configuration preset for said workpiece; whereby said workpiece could be fabricated through automated stamping processes to have thicker areas discontinuously distributed thereon at largely reduced scrap and manufacturing cost.