| 摘要 |
Disclosed is a method of forming a threaded fastener using a pair of thread rolling dies wherein each one of the pair of thread rolling dies comprises a body portion having a longitudinal axis. A plurality of primary thread rolling die threads, are disposed upon a working face of the body portion and are oriented at a predetermined angle with respect to the longitudinal axis of the body portion. These primary rolling die threads form a plurality of primary threads, upon a blank member during a thread rolling process, the primary threads being successively formed upon the blank member at first predetermined spaced positions. A plurality of sets of auxiliary thread rolling die threads are disposed upon the working face of the body portion at positions transversely interposed between the plurality of primary thread rolling die threads form a dual set of second, auxiliary threads upon said blank member during said thread rolling process. The distances through which material portions of the blank member utilized for forming the primary threads need be moved is minimized and mining the dimension of the dies. |
