Method and machine tool for manufacturing tubular sieve-like parts

摘要

697,572. Punching. ROTOVENT AKT.- GES. Oct. 4, 1951 [Oct. 16, 1950], No. 23129/51. Class 83 (iv). Perforated tubular parts are made by punching a cylindrical blank 1 with a plurality of holes 2 in a row and then shifting the blank and punching another series of holes therebetween. A lathe with headstock 11 and cam-shaft 4 is provided with a punching device P and operating cam 8. A blank is secured to a shank 57 by a split collet expanded by a nut 55 and the shank is inserted into the collet 14 of the lathe. A series of holes 2 are punched by a sub-press mechanism, Fig. 5, actuated by a spring 46 through a bell-crank 44 when released by a cam 8. The headstock is then shifted axially by a cam 10 and lever 16, 18 to position the blank for a second series of interspaced holes and the punches are again actuated. A cam 9 through lever 22 and ratchet 19 then indexes the blank for further rows of holes. A ratchet 29 holds the collet in adjusted position The blank may be moved axially after two series of holes have been punched and the row of holes extended. The punching die comprises an eccentrically bored shaft with lateral holes aligned with the punches.