METHOD AND APPARATUS FOR MAKING SHAPED STEMS OF SINGLE-SIDE CUTTING DRILLS Russian patent published in 1999 - IPC

FIELD: machine engineering. SUBSTANCE: lengthwise V-shaped outer groove is made in initial tubular blank by rolling blank in closed grooved pass between rotating rolls during one rolling pass. In order to realize it, end of initial blank is passed through roll grooved pass when shaping roll is drawn apart; said end is fixed in clamping mechanism connected with drive unit for moving it along blank drawing axis. Then blank of drill stem is reduced by means of shaping roll to final shape and blank is rolled at drawing it between rolls forming closed grooved pass along its remaining length. Apparatus may be realized at using two- or three-roll shaping system. EFFECT: enhanced efficiency of process, enlarged manufacturing possibilities of equipment, lowered cost for service and investment. 3 cl, 3 dwg