Transactions of Materials and Heat Treatment

Title：Influence of backward-bulging on deformation of complex-shaped parts of

Authors： Chen Baoguo Song Bo Huang Zhibin He Xueting Xu Yongchao Yuan Shijian

Unit： Shanghai Aircraft Manufacturing Co. Ltd. Harbin Institute of Technology

KeyWords： hydrodynamic deep drawing(HDD) backward-bulging dual-phase steel complex curved surface part

ClassificationCode：

year,vol(issue):pagenumber：2015,40(1):43-47

Abstract：

Performed and final formed parts of DP590 steel with different backward-bulging pre-deformations were obtained by backward-bulging and HDD including three stages of backward-bulging，flatting and hydrodynamic forming, and the influence of backward -bulging on wall thickness and strain of HDD parts was studied. The results show that the height of pre-bulging has a limitation in complex curved surface part. When it exceeds its limit value, the fold defect occurs to prevent the backward-bulging value from increasing. Method of back-bulging and HDD has a certain strengthen effect on the bottom of complex curved surface part compared with normal HDD. The thinning rate of the thickness increases by 2% and the equivalent strain increases by 0.03 when the relative pre-bulging height is up to 16%. Furthermore, pre-bulging height increases with the enlarging of bottom deformation, and it has little effects on the deformation of straight wall.

Funds：

陈保国(1979-)，男，博士研究生

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