| 摘要 |
Bevel gear is made by cold forming of a cylindrical blank in a die, using a press punch and a counter punch, and wherein the die cavity is extended cylindrically with gear like cross-section corresponding to the smallest gear diameter portion of the bevel gear. The counter punch is initially in a receded disposition so that some material of the blank is extruded into the tooth - impressions of the die cavity extension. The die is resiliently supported in relation to the counter punch so that in the last phases of press forming, the counter punch pushes the material from the cavity extension into the cavity proper for completely filling the tooth impressions in the die wherein the small diameter portion of the bevel gear is formed. |
