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《Journal of Zhejiang University(Engineering Science)》 2014-11
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Derating characteristics of metal cold extrusion with function of chattering

WANG Zhi-heng;YANG Qing-hua;HU Xin-hua;RUAN Jian;Key Laboratory of E&M Zhejiang University of Technology,Ministry of Education & Zhejiang Province;  
The principle which uses "effective friction"to reduce metal deformation resistance under the high-frequency chattering was analyzed.The simulation results of the fixed lower die and lower die in the flutter excitation with the different parameters were compared.Simulation results show that:flutter excitation can reduce the average stroke load for three kinds of extrusion methods;the greater the frequency and amplitude,the smaller the average stroke load,and vice versa.The structure and work principle of chattering platform which is driven by 2Dvalve were developed.The blank material is 6061 aluminum.Experiments of backward extrusion were carried out under different conditions.Load-stroke curves of backward extrusion were discussed.The experimental results of backward extrusion show that:Stroke load is significantly reduced after the lower die chattering;when the frequency is 100 Hz and amplitude is 0.012 mm,the steady stroke load is reduced by about 6%;when the frequency is 200 Hz and amplitude is 0.012 mm,the steady stroke load is reduced by about 7.5%.
【Fund】: 国家自然科学基金资助项目(51275475);; 浙江省科技厅资助项目(2012C21112)
【CateGory Index】: TG376.3
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