Improvements in or relating to the manufacture of small drilled and tapped metal parts such as hexagon and other nuts

摘要

560,764. Making nuts &c. HALL, N. Sept. 9, 1942, No. 12708. [Class 83 (ii)] In the manufacture of articles such as nuts, from metal or from plastics capable of taking a screw thread, in punch presses the drilling and tapping are carried out before the nuts &c. are completely severed from the stock. The nut P is punched part way from the stock at E and the recess is used to receive a locator F bored to receive a drill A which may act from either side of the stock ; countersinking follows at B, tapping at C and finally complete blanking out at G. In a modification at the drilling station a locator engages over the projecting part of the nut and drilling takes place from the other side. In a further modification the blank is dimpled or countersunk by a punch at the part blanking stage. In the case of very thin nuts the hole may be punched and the countersinking of the underside may be effected by a piloted drill.