| 摘要 |
PROBLEM TO BE SOLVED: To obtain a manufacturing method of a hypoid gear for differential, capable of reducing a production cost and improving gear face strength. SOLUTION: After a round bar stock W1 is upset forged to form a first preform W2 of a disk shape, a second preform W3 of a bottomed ring shape smaller in diameter and thicker than a final product is formed, by blanking the bottom part, a bottomless ring shape third preform W4 is formed, and then by subjecting the preform to descaling, reheating and rolling, a forth preform W5 having a rough product shape slightly smaller and thicker than the final product is manufactured, a fifth preform W6, in which a hypoid teeth are toothed by oscillation form rolling, is formed, further by subjecting the preform to annealing, descaling and then blanking the inner burr in forming, cold coining, a hypoid ring gear for differential W7 is manufactured. |
