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Dependence on forming parameters of an integral panel during the electromagnetic incremental forming process

Chinese Journal of Aeronautics 2018年第7期31卷 1625-1634页

作者： Jinqiang TAN Mei ZHAN Hongwei LI State Key Laboratory of Solidification Process School of Materials Science & Engineering Northwestern Polytechnical University

Nowadays, more and more attentions are paid to electromagnetic incremental forming（EMIF）, especially for a part with a large-scale size, e.g., an integral panel with stiffened ribs. In this work, the bending of a panel into a double-curvature profile via EMIF is carried out experimentally and evaluated by comparing the formed profile with the desired profile. During the process,discharges at four positions along different discharge paths are designed. The effects of forming parameters on the die-fittingness of the workpiece are discussed, for which two evaluation indices are used to judge forming results. The results show that a discharge voltage in an incremental mode is helpful to improve the fittingness and avoid the collision rebound against the die at the same *** at the diagonal positions with the ‘‘X＂ discharge path exhibits the minimal shape deviation and the best forming uniformity. On the contrary, discharging at the parallel positions with the ‘‘Z＂ discharge path obtains the worst forming quality. Overlap of the coil at different positions should be given during EMIF; however, a lower overlap rate of the coil helps improve the forming quality. The results obtained in this work are useful for forming integral panels with stiffened ribs via the EMIF process.

关键词： Electromagnetic incrementalforming (EMIF) Forming uniformity integral panel Parameters Shape deviation

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A progressive approach to predict shot peening process parameters for forming integral panel of Al7050-T7451

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Chinese Journal of Aeronautics 2021年第5期34卷 617-627页

作者： Chuang LIU Zhiyong ZHAO Xianjie ZHANG Junbiao WANG School of Mechanical Engineering Northwestern Poly technical UniversityXi'an 710072China

In this paper,a progressive approach to predict the multiple shot peening process parameters for complex integral panel is ***,the invariable parameters in the forming process including shot size,mass flow,peening distance and peening angle are determined according to the empirical and machine ***,the optimal value of air pressure for the whole shot peening is selected by the experimental ***,the feeding speed for every shot peening path is predicted by regression *** integral panel part with thickness from 2 mm to 5 mm and curvature radius from 3200 mm to 16000 mm is taken as a research object,and four experiments are *** order to design specimens for acquiring the forming data,one experiment is conducted to compare the curvature radius of the plate and stringer-structural specimens,which were peened along the middle of the two *** most striking finding of this experiment is that the outer shape error range is below 3.9%,so the plate specimens can be used in predicting feeding speed of the integral *** second experiment is performed and results show that when the coverage reaches the limit of 80%,the minimum feeding speed is 50 mm/*** this feeding speed,the forming curvature radius of the specimens with different thickness from the third experiment is measured and compared with the research object,and the optimal air pressure is 0.15 ***,the plate specimens with thickness from 2 mm to 5 mm are peened in the fourth experiment,and the measured curvature radius data are used to calculate the feeding speed of different shot peening path by regressive analysis *** algorithm is validated by forming a test part and the average deviation is 0.496 *** is shown that the approach can realize the forming of the integral panel precisely.

关键词： Curvature radius measure integral panel Process parameters prediction Regressive analysis method Shot peening process

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Prediction of stiffener buckling in press bend forming of integral panels

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Transactions of Nonferrous Metals Society of China 2011年第11期21卷 2459-2465页

作者：阎昱王海波万敏北方工业大学机电工程学院北京100144 北京航空航天大学机械工程及自动化学院北京100191

In order to predict the buckling of stiffeners in the press bend forming of the integral panel,a method for solving the critical buckling load of the stiffeners in press bend forming process was proposed based on energy method,elastic-plastic mechanics and numerical *** to buckle experiments were carried out on the designed press bend *** is found that the predicted results based on the proposed method agree well with the experimental *** the proposed method,the buckling of the stiffeners in press bend forming of the aluminum alloy integral panels with high-stiffener can be predicted reasonably.

关键词： press bend forming buckling prediction integral panel

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