THREAD-ROLLING TOOL FOR ROLL-BURNISH (ING EXTERNAL CONIC THREADS Russian patent published in 2010 - IPC B21H3/04 B24B39/04 

FIELD: machine building.

SUBSTANCE: thread rolling tool consists of two or three similar conic rollers with thread and cosine angle φ_p. Axles of conic rollers are installed at angle φ+φ_p 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 φ_p is determined with formula:

where k_p - is number of starts of roller threads, k_d - is number of starts on the billet, φ 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