Transactions of Materials and Heat Treatment

Title：Padding assisted increment-bending for multi-step cylindrical skin

Authors： Deng Liang Song Bo Chen Baoguo

Unit： Shanghai Aircraft Manufacturing Co. Ltd.

KeyWords： aluminum alloy multi-step increment-bending padding skin

ClassificationCode：TG302

year,vol(issue):pagenumber：2017,42(8):45-49

Abstract：

Green manufacturing multi-step skins with variable thickness is one of important problems on aerospace sheet metal forming. The variable thickness skins change to equal thickness skins by padding, which is one of the major approaches. For the cylindrical skin of multi-step on an aircraft, five skins were designed, and the influences of padding material, thickness compensation of padding, process parameters on the forming of skin were investigated. The results show that increment-bending can be a precision forming under the condition of a PA6-G padding of 0.1 mm thickness difference and 0.4 mm gap between skin and theoretical surface. Therefore, when material and dimensions of padding is suitable, the difference in thickness caused by forming can be eliminated. Furthermore, higher precision skins can be obtained, and the padding assisted increment-bending process is feasible for cylindrical skin with variable thickness of multi-step.

Funds：

邓亮（1980-），男，硕士，高级工程师陈保国（1979-），男，博士，高级工程师

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