| 摘要 |
<p>In order to make possible the use of work material bars (14, 16) without requiring a previous preparation of the rear end of the bar, the pusher head (11) is provided with internal ribs (13) of which the surfaces directed towards the axis form cone portions. Between those ribs, there are provided free spaces (12) wherein eventual burrs (17) may get in. Furthermore, the taper angle ( beta ) is small. Thus, a rear face of the bar in a raw state, which has not been prepared by surfacing or conical turning, is not subject to any substantial excentricity. Said pusher head is appropriate to be mounted in all types of feed devices for automatic lathes, particularly those of which the feed pressure is exerted hydraulically.</p> |
