Patent ID: 6915673
Filing Date: 2005-07-12
Classification: B21H,F16H,Y10T

Abstract:
1. A worm rolling method comprising: a step of providing a rolling machine comprising: a first step of rolling said blank by penetrate-feeding said dies toward said blank while synchronously rotating said dies in a same direction; and a second step of rolling said blank with said dies by reversing the direction of rotation of said dies after termination of said first step, wherein said first step and said second step are alternatively repeated to form a worm; wherein through-feed, which is axial travel of said worm due to a change in a lead angle of said worm caused by a change in a diameter of said blank during said rolling, is detected from travel of said blank, and when said travel has exceeded a set range, the direction of rotation of said dies is reversed to reverse a direction of said through-feed.