专利名称：Method of manufacturing a washer发明人：Wen-Yuan Lee申请号：US07/772415申请日：19911007公开号：US05259819A公开日：19931109
摘要：A method of manufacturing a washer includes the steps of: (a) feeding a metalwire into a die having a bearing face and a through hole which opens to the bearing faceso as to permit the metal wire in the through hole to protrude out of the bearing face ata predetermined length; (b) punching the protruded metal wire against the bearing faceto form a disc with a punching head which includes a core and a shell; (c) punching the discto form a central hole on the disc by forcing the core out of said shell and into thethrough hole; and (d) retracting the punching head to allow the disc to separate from themetal wire.
申请人：LEE; WEN-YUAN
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