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Abstract：
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A connecting rod is the important part of diesel engines.Good or bed quality of them concerns with the reliability of diesel engines directly.In order to improve the quality of connecting rod die forgings of large-middle size diesel engines,this article through the introduction of situation about large-middle size diesel engines takes 16V240,16V280 type as the typical which is produced in our works to analyzes the forming reason that easy produces several common quality defects when connecting rod die forgings are forged in the steam-air die hammer,such as that the height of die forgings exceeds the upper limit of tolerance,the " I " shape bar body,the passing bands of an arc and periphery of big end plane in connecting rod occurred folding appearances,the center distance of hole between big end and small end of connecting rod exceeds over the dimension etc.It summarizes that the technical parameter should be chosen to solve the quality defects of connecting rod die forgings from the view of technology and design of dies.By means of the rich experience gained from a large quantities of production for a long time,finds that the most quality defects of forgings are caused by the improper technology, design of dies,as long as the proper technical parameter is chosen,these common quality questions can be solved quite well.
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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学会.锻压手册[M].北京:机械工业出版社,1993.
[2]张志文.锻造工艺学[M].北京:机械工业出版社,1983.
[3]GB12362 90.钢质模锻件公差及机械加工余量[S].1991.
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