Patent ID: 8898903

Claim:
A form rolling method for involute gears, comprising: providing a work piece including a cylindrical outer peripheral surface having a predetermined radius; determining a first pitch by dividing a length of an outer circumference of the work piece prior to form rolling by a number of teeth of an involute gear to be formed from the work piece; determining a first pressure angle of each tooth of the involute gear; determining a reference pressure angle corresponding to a crossing point of a tooth flank on a driving side in a rotational direction of a reference die and a tooth flank on a driven side in the rotational direction of the reference die; selecting a round die including: a single uniform involute tooth profile for each tooth of the round die provided with a second pressure angle that is greater than the first pressure angle and less than or equal to the reference pressure angle, and an addendum pitch that is equal to the first pitch that was determined; and pressing the round die to the work piece while rotating the round die to form the involute gear from the work piece.