| 摘要 |
PROBLEM TO BE SOLVED: To provide a forming method of spline forging products capable of keeping high size precision for a long time and preventing the occurrence of cracks to the utmost. SOLUTION: The forming method of a spline forging product have an axis part 14 extended to the axis direction, a flange part 15 with larger diameter than that of the axis part at one edge of the axis 14, a connecting corner 10 for connecting the flange part 15 and the axis part 14 is formed with a recessed peripheral shape in the flange part 15 along the axis part, and a spline 9 is formed from the connecting corner 10 to the another edge side of the axis part 14. A spare shaft 4 having an outer diameter smaller than the diameter of a tooth bottom surface 9a of the spline 9, and a spare form product having a spare flange part 5 with a diameter larger than that of the spare shaft 4 are formed beforehand, and the spare shaft 4 is extended the diameter to form the spline 9, and at the same time, the outer circumference part of the spare flange part 5 is projected to the other edge side of the axis part 14 by pressing the spare flange part 5 in the axis direction, and a recessed peripheral connecting corner is formed. COPYRIGHT: (C)2004,JPO
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