FIELD: plastic metal working, threading tools, thread knurling on screws and wood screws. SUBSTANCE: method comprises step of making on article preliminary thread for smoothly transforming it to thread of ready article. Preliminary thread has symmetrical profile with included angle more than that of ready article but no more than 100 degrees. Knurling tool has on its entering part thread with included angle more than that of ready article but no more than 100 deg. EFFECT: enhanced efficiency of method, improved design of tool. 3 cl, 2 dwg
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| METHOD TO STAMP ROD-TYPE PIECES WITH A HEAD PROVIDED WITH RADIAL SPROUTS, A PUNCH FOR PREMOULDING THE SPROUTS OF ROD-TYPE PIECES AND A PUNCH FOR FINISHED MOULDING SPROUTS OF THE HEAD OF ROD-TYPE PIECES | 1992 |
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