Electromagnetic V-shape bending of small size sheet blank is investigated numerically and experimentally. Three-dimensional electromagnetic field models are established to calculate the magnetic force distribution on ...Electromagnetic V-shape bending of small size sheet blank is investigated numerically and experimentally. Three-dimensional electromagnetic field models are established to calculate the magnetic force distribution on the sheet by software ANSYS / EMAG. Series of electromagnetic V-shape bending forming experiments are presented,in which small size uniform pressure coil and big size round flat spiral coil are used. The results show that small size uniform pressure coil is not suitable for electromagnetic forming of small size flat sheet,and the coil is susceptible to failure such as bulging,ablation and cracking. When the plane dimension of round flat spiral coil is bigger than sheet blank sizes,the induced current crowding effect will be resulted which seriously influence the magnetic force distribution on the sheet. In this case,magnetic force distribution can be adjusted through the change of the relative position between coil and sheet,the desired deformation can be obtained finally. Therefore,big size round flat spiral coil can be well applied to electromagnetic V-shape bending forming of small size flat sheet.展开更多
文摘针对商业合版印刷无法适应满版成品离线自动分离设备的要求,探索并提出一种能实现满版成品离线自动分离的拼版方法。根据满版成品离线自动分离设备的工作原理,给出成品自动分离要求,然后依据成品自动分离要求,利用Adobe Illustrator和TongYin PDF Expert软件完成产品拼版。实例分析结果表明,相较于人工成品分离,所实现的满版成品离线分离提升了近2倍的工作效率,同时也减少了2/3的人员需求;相较于拆标机,满版成品离线自动分离设备的生产效率提高了1倍,且换版时间不超过5 min。此方法为实现商业合版印刷成品的自动分离提供了新的解决方案,带来显著的效率提升和成本降低。
基金Sponsored by the National Basic Research Program of China(Grant No.2011CB012800 and 2011CB012804)
文摘Electromagnetic V-shape bending of small size sheet blank is investigated numerically and experimentally. Three-dimensional electromagnetic field models are established to calculate the magnetic force distribution on the sheet by software ANSYS / EMAG. Series of electromagnetic V-shape bending forming experiments are presented,in which small size uniform pressure coil and big size round flat spiral coil are used. The results show that small size uniform pressure coil is not suitable for electromagnetic forming of small size flat sheet,and the coil is susceptible to failure such as bulging,ablation and cracking. When the plane dimension of round flat spiral coil is bigger than sheet blank sizes,the induced current crowding effect will be resulted which seriously influence the magnetic force distribution on the sheet. In this case,magnetic force distribution can be adjusted through the change of the relative position between coil and sheet,the desired deformation can be obtained finally. Therefore,big size round flat spiral coil can be well applied to electromagnetic V-shape bending forming of small size flat sheet.
