FIELD: manufacture of products from electrical porcelain. SUBSTANCE: method involves pressing blank to form inner surface of insulator skirt portion and threaded surface on inner diameter of thread; using punch as cementing member providing transmission of torque from spindle to basic blank. Exit of air and excessive mass through central and side openings of punch facilitate leveling of punch pressure on wall material to avoid air entrapment and creation of inner cracks in insulator wall. Arrangement of punch on turning machine spindle and of pressing device in tail block for rotation about its axis allows both insulator cavity formation and machining to be combined. EFFECT: simplified manufacture method. 3 cl, 3 dwg
