| 摘要 |
The present invention provides a hot forging method to manufacture a hollow member which includes the steps of: manufacturing a closed member having a hollow part in the center using a raw material in a shape of a bar; heating the close member; and manufacturing a closed product formed by forging the heated closed member. The closed member having a hollow part formed therein is used instead of the raw material, which is cut in accordance to the prior hot forging method. Therefore, the hollow member can be manufactured with less load pressure when compared to the prior hot forging method. |
