| 摘要 |
PURPOSE:To roll mutlikinds of screws of nominal diameter with one kind of flat die by using the flat die having the blade in parallel to the rolling direction and rolling by dislocating the flat die by the lead angle by matching to the billet diameter. CONSTITUTION:The blade face of a flat die 1 is zero at its lead angle alpha (blade in parallel to rolling direction) attaining to a specified pitch P. This flat die 1 is subjected to rolling by dislocating it by the lead angle alpha by matching it to the blank diameter. Namely the lead angle is taken as alpha1 in case of the blank diameter being d01 and in case of the blank diameter being d02 the flat die 1 is inclined by matching to the lead angle alpha so that the lead angle may become alpha2, and the billet 2 is subjected to rolling. As a result of the rolling of multikinds of screws being made possible with one kind of flat die by doing like this provided the pitch to be same, the number of flat dies may need less, the cost and time spent for the work of the flat die are reduced and the productivity is improved. |
