ANALYSIS AND CONTROL TECHNIQUE OF FIXTURING DEFORMATION MECHANISM OF

THIN-WALLED WORKPIECE

QIN Guohua^{1, 2}   WU Zhuxi¹  ZHANG Weihong²

(1. Department of Mechanical Engineering, Nanchang Institute of Aeronautical Technology, Nanchang 330034;
2. Sino-French Laboratory of Concurrent Engineering, Northwestern Polytechnical University, Xi’an 710072 )

Abstract: A general methodology is systematically presented to analyze and select optimally the magnitude, placement and clamping sequence of a fixturing scheme. Based on history dependency of contact forces depending on frictional forces between the workpiece and fixture, effect of multiple clamps and their application sequences on thin-walled workpiece deformations is quantitatively analyzed. Analysis model of clamping sequence is mathematically established and its solution, which can be realized in FEM software, is presented according to minimization of the total complementary energy. On the other hand, based on the optimization model of clamping sequence, control technique is presented so that the minimum deformation of thin-walled part can be obtained. Took example for the typical fixturing case with aluminum alloy, a detailed discussion is made about how the analysis and optimal design of multiple clamping forces and their application sequences are carried out.

Key words: Thin-walled workpiece Multiple clamping forces Clamping sequence

CLC No: TG75

航空科学基金(2006ZE56006)、南昌航空工业学院科研基金(EA200503139)、国家自然科学基金(10676028)、陕西省自然科学基金(2004E217)和航空支撑制造技术(61901090104)资助项目. Received 20060502, received in revised form 20061121