基于集磁器的铝合金管件的电磁缩径研究

Research on electromagnetic necking of aluminum alloy tubes based on field-shaper

基于电磁缩径理论,针对螺旋槽集磁器参数、电压与3003铝合金最大减径量之间的关系进行研究,利用松散耦合法对铝合金管件缩径变形进行仿真,研究了放电电压、集磁器螺旋槽数和集磁器锥度对管件最大减径量的影响。结果表明:随放电电压的提高,电容储能增加,管件的最大减径量也增大;螺旋槽数和放电电感有关,进而影响磁压力和放电周期,恰当的选取集磁器螺旋槽数可以使管件径向变形量达到最大。锥度对涡流损耗有较大影响,集磁器锥度越大,涡流损耗越大,管件径向变形量越小。对铝合金管件进行缩颈试验,实际成形效果与模拟结果较为吻合。

Based on the theory of electromagnetic necking,the relationship between the voltage and the maximum diameter displacement of the 3003 aluminum alloy was studied.The loose coupling method was used to simulate the diameter displacement of aluminum alloy tube.The effects of discharge voltage,numbers of spiral grooves on the field shaper and the taper of the field shaper on the maximum diameter displacement of the tube were studied.The results show that with the increase of the discharge voltage,the energy storage of the capacitor increases,and the maximum diameter displacement of the tube also increases;the number of spiral grooves is related to the discharge inductance,further affects the magnetic pressure and discharges period,the proper selection of the number of spiral grooves of the field shaper can maximize the radial displacement of the tube;the taper has a greater influence on the eddy current loss.The larger the taper of the field shaper,the larger the eddy current loss,and the smaller the radial displacement of the tube.The necking test is carried out on the aluminum alloy tube,and the actual forming effect is in good agreement with the simulation result.