| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot forging mold which can be made to proceed smoothly upset forging, even if there are almost no gaps between a workpiece which is inserted into the lower mold and the lower mold concerned.SOLUTION: In a hot forging mold 1 having a lower mold 4 and an upper mold 5 which is pressed to the lower mold 4, which performs upset forging a wasteland 2 charged into the lower mold 4 by pressing the upper mold 5 into the lower mold 4, the upper mold 5 includes a columnar punch portion 11, and a columnar contact portion 13 which is formed at the end part of the punch portion 11 to be pressed to the wasteland 2. The contact portion 13 which, while having a lateral surface going back to the inside of the punch portion 11 from the lateral surface of the columnar punch portion 11, forms a pocket portion 14 which is a space surrounding the contact portion 13 together with the lower mold 4 and the punch portion 11 when pressed to the lower mold 4. |
