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Abstract：
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Based on the numerical simulation technology, the precision roll forging process of hollow tube forgings was studied by analyzing the process of hollow tube forgings. In the study, it was found that when the process mold was designed according to the current roll forging theory, the stress concentration and folding occurred on the inner surface of the elliptical cross-section near the roll gap during the first roll forging of hollow tube forgings, and it had a certain deviation from the current roll forging theory. Therefore, it was necessary to strictly control the extension coefficient of each pass in the roll forging, and the process was optimized by four-pass roll forging. The final simulation results show that the wall thickness dimensions of hollow tube forgings have a certain fluctuation along the axis direction, and the local wall thickness is thickened. However, after the final roll forging, the good effects of regular shape, no flash, internal smooth without defects and reasonable streamline distribution are obtained.
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Funds：
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国家科技重大专项（2019ZX04022001）
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AuthorIntro：
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杨勇（1982-），男，博士，高级工程师，E-mail：yy19821110@163.com
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Reference：
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