Transactions of Materials and Heat Treatment

Title：Research and application on hydroforming technology for large thin-walled scalloped segment component

Authors： Tian Shu Li Jiguang Zhang Jiegang Yang Shengwei Yu Hongzhe Lang Lihui

Unit： Tianjin Long March Launch Vehicle Manufacturing Co. Ltd. Tianduan Aviation Technology Co. Ltd. Beihang University

KeyWords： hydroforming ellipsoidal scalloped segment cavity pressure lubrication condition wall thickness uniformity

ClassificationCode：TG394

year,vol(issue):pagenumber：2019,44(1):68-72

Abstract：

The technology improvement of large thin-walled ellipsoidal scalloped segment component in carrier rocket was carried out by hydroforming technology, and taking the wall thickness distribution and forming quality as the indexes, the reasonable range of key technological parameters such as cavity pressure was analyzed by the numerical simulation. The result shows that when the cavity pressure is loaded to 2 MPa, the uniformity of wall thickness can be satisfied. When the interval of thinning rate distribution is from 3.238% to 5.703%, the ideal thinning can be realized to control springback, and the product performance can be guaranteed. Furthermore, the formation mechanism and control measures of defects after deep drawing were researched by on-site experiment analysis, and the influences of technological parameters on the forming quality of part were analyzed. The results show that the cracking and wrinkling defects during the forming process can be obviously improved by controlling the cavity pressure at the early stage of forming and lubricating the bilateral flanges largely. The ellipsoidal scalloped segment component meeting technical specifications is conducted, the shaped precision of formed part profile is less than 2 mm, the interval of thinning rate distribution is from 3.4% to 4.94%, and the hydroforming technology of large thin-walled ellipsoidal scalloped segment components is realized.

Funds：

天津市科技计划项目（17YFZCGX00530）

田恕（1987-），女，硕士，工程师，E-mail：tian6shu@163.com

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