| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a leaf spring, capable of preventing such failure as causing a crack at a folding portion or breaking the folding portion when folding a leaf spring material.SOLUTION: First, there is prepared a leaf spring material 40 of a copper alloy with a rolling process along a predetermined rolling direction D performed thereto. Next, the leaf spring material 40 is processed into a predetermined shape, and folding portions 11e, 11d of the leaf spring material 40 are folded at folding lines F, F. When folding the folding portions 11e, 11d of the leaf spring material 40, the folding portions 11e, 11d are folded such that the folding lines F, Fintersect the rolling direction D of the leaf spring material 40 at an angle of 70° or larger and 90° or less. |
