Transactions of Materials and Heat Treatment

Title：Numerical simulation and experimental research on hydraulic necking technology for retaining ring

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ClassificationCode：TB24

year,vol(issue):pagenumber：2020,45(7):95-102

Abstract：

The stress states and deformation laws of 300 MW Mn18Cr18N steel retaining ring during hydraulic necking were analyzed by finite element simulation and experiment method. The result shows that the inner wall of ring blank enters plastic deformation state first, and then expands to the outer wall gradually with increasing of external pressure. During the deformation process, the deformations of ring blank′s inner, middle and outer walls are coordinated. Both the equivalent strain and equivalent stress of inner wall for ring blank are always larger than those of outer wall. The cone angle of die is an important factor that affects the shape of ring blank during necking. Due to the change of cone angles for die, the radial pressure component Fr and the axial pressure component Fz on the end of ring blank are changed accordingly. When the cone angle of die is small, the radial pressure component Fr is obviously larger than the axial pressure component Fz. It leads to the bulging shape of ring blank after necking when the die with small cone angle is used. When the cone angle of die is large, the axial pressure component Fz will be larger than the radial pressure component Fr. Therefore, when the die with large cone angle is used, the ring blank presents a trumpet shape after necking. By means of numerical simulation and experimental verification, it concludes that when the cone angle of die is about 50°, the ring blank can obtain better hydraulic necking effect.

Funds：

国家自然科学基金资助项目(51575372)；山西省科技攻关计划(工业)项目（201603D121006-2）；山西省重点学科建设经费资助

李飞（1989-），男，博士研究生 E-mail：170723191@qq.com 通讯作者：陈慧琴（1968-），女，博士，教授 E-mail：chen_huiqin@126.com

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