| 摘要 |
PURPOSE:To provide a manufacturing method for an aluminum alloy connecting rod in which the high residual compression stress distribution in the range from directly under to the deep part of the inner peripheral surface of a small edge hole can be obtained and the fatigue strength on the inner peripheral surface of the small edge hole can be improved. CONSTITUTION:The shaped body of the quenching-coagulated aluminium alloy powder is forged in a warm temperature region and applied with the molten body heat treatment (T6 processing). The composition is an Al-17% Si-6% Fe system. In the first roller working process, the first mandrel 34 is revolution-driven, pushing the first strong pressure roller 32 of a burnishing device 3 into the small edge hole 10 of a connecting rod 1, and each first strong pressure roller 32 is followingly revolved, and the inner peripheral surface 10a of the small edge hole 10 is strongly pressed by the large diameter part 32x of the roller surface 32a. Then, in the first roller working process, the second mandrel having a polygonal shaped section is revolved, and the inner peripheral surface 10a of the small edge hole 10 is tapped intermittently by the second strong pressure roller, and the intermittent peening action and the rolling action are applied. |
