FORGING METHOD, FORGED ARTICLE AND FORGING APPARATUS

摘要

An axial intermediate portion of the raw material 5 is held with a holding die 10 in a state in which the intermediate portion is prevented from being enlarged in diameter. The axial end portions of the raw material 5 is inserted in forming dented portions 6 and 6 formed at axial end portions of the holding die 10. The scheduled diameter-enlarging portions 6 and 6 are inserted in insertion passages 22 formed in guides 20. Then, the scheduled diameter-enlarging portions 6 and 6 are simultaneously pressed with punches 30 to fill the material of the scheduled diameter-enlarging portions 6 and 6 in corresponding forming dented portion while moving each guide 20 in a direction opposite to a moving direction of each punch 30, thereby enlarging each scheduled diameter-enlarging portion 6.