OSCILLATING ROLLERS FOR KNURLING OUTER THREADS Russian patent published in 2006 - IPC B21H3/04 

FIELD: plastic working of metals, namely knurling outer threads by means of rollers.

SUBSTANCE: oscillating rollers include boss with opening and key groove, central cylindrical calibrating portion and cone lip portions on ends of rollers. Calibrating and lip portions are arranged in periphery and they are shifted in axial direction by angle α relative to plane normal to rotation axis. Boss has ends normal relative to said axis. Length of calibrating portion l_c and axial shift angle α that may be in range 0 - 45° are determined respectively with use of given formulae: l_c = L_th x k_stb /k_str and α = arctg [( _{Lth - lc lin)Drol ] where lc - length of calibrating portion of rollers, mm; Lth - length of knurled thread, mm; k stb -number of thread starts on blank; k rol - number of thread starts on roller; lin - length of cone lip portion of rollers, mm; α - axial shift angle, degrees; Drol - outer diameter of oscillating rollers, mm.}

EFFECT: enlarged manufacturing possibilities, improved efficiency, possibility for knurling threads in long length at lowered radial efforts.

5 dwg, 1 ex