A method for producing a cutting tap and cutting tap,

摘要

A cutting taps with (22) elongated tap body, (24) has grooved portion (30) axial front end (22) elongated tap body, chamfered fluted section grooved section (30) ( cutting tap including grooved section (56) is provided and the finish 54). Each cutting threads chamfered fluted section (54) (58,62,66,68), and a (72, 76, 80) rake face which is disposed in the rake face angle, the rake face angle, cutting I would much negative angle (58,62,66,68) is axially away backward axial front end chamfer grooved portion (54) from (24) thread. Each cutting threads finish grooved section (56) (58,62,66,68) has a (72, 76, 80) rake face which is disposed in the finish rake face angle substantially equal. Finish rake face angle is a negative angle than the rake face angle of cutting the threads of the axially aft end chamfer grooved portion (54).