To reduce the number of processing steps while ensuring worm gear accuracy satisfactorily.
A work material is positioned between a first rolling die 100 and a second rolling die 101 by rotation of the rolling dies, and a servomotor 76 for feeding the work material. When a lead angle of a worm is large and there is a large difference between a finished diameter and a blank diameter, the lead angle changes during the progress of rolling process, resulting in occurrence of through-feed. As a slide plate 55 is freely slidable on a slide 53, through-feed occurs owing to the lead angles of the first and second rolling dies 100 and 101 and the workpiece. When the through-feed becomes more than a set value, the rotation of the first rolling die 100 and the second rolling die 101 is stopped. Then, the first rolling die 100 and the second rolling die 101 initiate reverse rotation, and at the same time, the slide plate 55 also initiates movement in the reverse direction. Thus, rolling is started. Thereafter, similar processing is repeated to manufacture a worm gear 80 having circular arc-shaped bottom.
YOSHIZAWA MINORU
AMANO SHUICHI
ITO KENJI
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Sadao Enjoji
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