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Abstract：
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A hollow shaft was produced in Dongfeng Forging,Co.,Ltd.,Its total length was about 867mm,and the diameter of the middle part was much bigger than that of adjacent part.Originally,it was forged with hot die machine,and the material utilization was low.Now it was improved to be produced with upset forging machine,and each piece could save 3.6kg steel.During the development of upset forging technology,it was found that the end part of Φ42mm was very hard to fill out,and the quality of the middle part of Φ76mm was not very stable with the unstable heat quality.After the debugging,adjustments were made both to the forging drawing and the upset forging technology,and success was achieved in the end.Some lessons can be drawn from this upsetting forging technology for other similar forgings with long axis.
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AuthorIntro：
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Reference：
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[1]中国机械工程学会锻压分会.锻压手册[M]:第1卷.北京:机械工业出版社,1993.
[2]《锻模设计手册》编写组.锻模设计手册[M].北京:机械工业出版社,1991.
[3]中国机械工程学会锻压分会.锻压手册[M]:第3卷.北京:机械工业出版社,1993.
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