Transactions of Materials and Heat Treatment

Title：Study on influence of process parameters on forming limit of hemispherical parts in drawing-bulging

Authors： Liu Li1 Kong Fanqun1 2 Lin Hong1 Zhao Guoji1

Unit： 1.Chongqing Industry Polytechnic College 2.Dongfeng Automobile Co. Ltd.

KeyWords： hemispherical parts drawing-bulging forming limit numerical simulation orthogonal experiment

ClassificationCode：

year,vol(issue):pagenumber：2015,40(7):127-131

Abstract：

In order to improve the forming limit of drawing-bulging hemispherical parts, the influences of blank holder force, friction coefficient, stamping speed and die fillet radius on drawing-bulging forming limit were studied. Combining numerical simulation with orthogonal experiment，it is found that the biggest factor that effects the drawing-bulging forming limit is the blank holder force, which is followed by die fillet radius and friction coefficient, and while the effect of stamping speed is relatively weak. The drawing-bulging forming limit decreases with the increase of blank holder force, friction coefficient and stamping speed and with the decrease of die fillet radius. In a word,in order to improve the drawing-bulging forming limit of hemispherical parts, the suitable parameters are selected as blank holder force 20 kN, die fillet radius 12 mm, friction coefficient 0.125 and stamping speed 2000 mm·s-1. Finally, process testing shows that the simulation result is consistent with the experimental result, and the drawing-bulging forming limit is improved greatly.

Funds：

重庆市教委科学技术研究项目（KJ132105）

刘利（1968-），女，本科，实验师

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