49923235 : 1. Hammer or Smith Forging

12 2. Drop Hammer Forging

3 3. Press Forging

4. Upset Forging

4 5. Roll Forging

, 5

1 4 2 5

3

: I. II. III.

I. II. I. II.

I. II. III.

http://www.xiuning.gov.cn/newsdisp.asp?id=27427 http://www.esi-group.com/products/casting/Etips/e-tips/eTip16.pdf