THREAD-ROLLING TOOL FOR ROLL-BURNISH (ING EXTERNAL CONIC THREADS

摘要

FIELD: machine building. ^ SUBSTANCE: thread rolling tool consists of two or three similar conic rollers with thread and cosine angle åp. Axles of conic rollers are installed at angle å+åp to rotation axis of a billet in lengthwise section. The part of the roller with the biggest diametre roller-burnishes the biggest diametre of billet thread, while the part of roller with the smallest diametre roller-burnishes the smallest diametre of billet thread. Also k angle of cone of rollers åp is determined with formula: ^ where kp - is number of starts of roller threads, kd - is number of starts on the billet, å is angle of cone of roller-burnished thread, degr. ^ EFFECT: elimination of roller turn slipping against billet and increased resistance of thread roller-burnishing tool. ^ 1 dwg, 1 ex