| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for form rolling, which contributes to enhancing the accuracy of a form-rolled product such as a rolled gear. SOLUTION: This form rolling method is for forming a form-rolled product, where a workpiece having a form of a circular plate and a form-rolling die are used, a form rolling is carried out, while the rolling die is rotating and penetrating into the outer peripheral part of the workpiece and a finish sizing operation is given after a full amount of penetrating operation has been completed. A fist stage penetrating operation A1 is carried out, where a form-rolling die penetrates into the outer peripheral side of the workpiece to a midway position of the full depth of penetration S of the form-rolling die. An intermediate sizing operation A2 is carried out by making the penetration rate of a roll-forming die significantly small or substantially zero in the midway position of the full depth of penetration S of the form-rolling die. Thereafter, a second stage penetrating operation A3 is carried out, after which the form-rolling die penetrates into the outer peripheral side of the workpiece and then the finish sizing A4 is carried out.
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