| 发明名称 |
FORGED CRANKSHAFT AND METHOD FOR MANUFACTURING THE FORGED CRANKSHAFT |
| 摘要 |
A forged crankshaft (1) includes a carbon steel containing S, wherein in a portion corresponding to a machined outer circumferential surface of a shaft part such as journals (J), crank pins (P), a front part (Fr), and a flange (Fl), a ratio x/y of an area rate x of sulfide in a position (X) corresponding to a parting surface of a die for finish forging to an area rate y of sulfide in a position (Y) corresponding to a bottom of a die impression of the die for finish forging is equal to or lower than 1.5. The forged crankshaft (1) can avoid an occurrence of machined surface cracks on the journals (J) and the crank pins (P) after the outer circumferential surface is machined. |
| 申请公布号 |
US2015321245(A1) |
申请公布日期 |
2015.11.12 |
| 申请号 |
US201314647472 |
申请日期 |
2013.12.09 |
| 申请人 |
NIPPON STEEL & SUMITOMO METAL CORPORATION |
发明人 |
TAHIRA Hiroaki;KIM Kisung;OKUBO Junichi |
| 分类号 |
B21K1/08;B21J5/12;F16C3/08;B21J5/02 |
主分类号 |
B21K1/08 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A forged crankshaft, comprising:
a carbon steel containing S, wherein in a portion corresponding to a machined outer circumferential surface of a shaft part, a ratio x/y of an area rate x of sulfide in a position corresponding to a parting surface of a die for finish forging to an area rate y of sulfide in a position corresponding to a bottom of a die impression of the die for finish forging is equal to or lower than 1.5. |
| 地址 |
Chiyoda-ku, Tokyo JP |
