Transactions of Materials and Heat Treatment

Title：Research progress on theoretical analysis for profile in stretch-bending process

Authors： Jin Chaohai Liu Cong Li Xiaoqiang Li Dongsheng

Unit： Beihang University

KeyWords： stretch-bending of profile forming defect analysis calculation elastoplastic theory curvature springback

ClassificationCode：TG301

year,vol(issue):pagenumber：2021,46(4):21-28

Abstract：

The stretch-bending process is a kind of forming method which can effectively control the shape precision of bending parts. Theoretical analytical analysis is a research method for studying the process mechanism of stretch-bending and predicting the forming quality of stretch-bending workpieces. There are currently four main methods such as standard load method based on elastoplastic theory, process analysis method based on elastoplastic theory, numerical analysis method based on energy function and difference analysis method based on strain increment theory. Among them, the method 1 gives the forming limit diagram of drawing force and bending moment for workpiece to predict the springback and residual stress distribution of workpiece with different section parameters and materials after unloading. The method 2 focuses on analyzing the stress and strain states of section to calculate the relationship between the springback of workpiece after unloading and the stretch-bending process parameters based on the stretch-bending process. The method 3 and method 4 are both simplified numerical analysis methods and are derived based on functional equations and difference equations respectively to predict the springback and section distortion of parts after stretch-bending. For the current situation that the analytic methods for researching on stretch-bending process were relatively scattered, a more feasible research direction was put forward by analyzing and summarizing the related literature on the study of analytic method for stretch-bending profile.

Funds：

国家重点研发计划项目(2017YFB0306200)；国家自然科学基金资助项目（51775023）；航空科学基金资助项目(2016ZE51040)

金朝海（1973-），男，博士，副教授 E-mail：377792084@qq.com 通讯作者：刘聪（1997-），男，硕士研究生 E-mail：819270188@qq.com

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