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Application of electromagnetic-assisted stamping (EMAS) technique in incremental sheet metal forming 总被引:1,自引:0,他引:1
C.N. Okoye J.H. Jiang Z.D. Hu 《International Journal of Machine Tools and Manufacture》2006,46(11):1248-1252
The application of high velocity electromagnetic-assisted stamping (EMAS) technique in incremental sheet metal forming has been proposed. EMAS whose principle is based on Lorenz force is a hybrid forming process that uses both quasi-static conventional stamping technique and electromagnetic forming actuators built into sharp corners and other difficult-to-form contours to form metals. The recent push to use more artificial intelligent (AI) aluminum alloys in automobile and aircraft industries as a result of increasing demand for fuel efficient cars and aircrafts, large size vehicle panels, improved formability limit of materials and weight reduction have placed EMAS as one of the best high velocity forming technique.It is believed that the end result of this vision will lead to more cost effective land and aerospace vehicles. 相似文献
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Electromagnetic forming(EMF) is a high-velocity manufacturing technique which uses electromagnetic (Lorentz) body forces to shape sheet metal parts. One of the several advantages of EMF is the considerable ductility increase observed in several metals, with aluminum featuring prominently among them. Electromagnetically assisted sheet metal stamping(EMAS) is an innovative hybrid sheet metal processing technique that combines EMF into traditional stamping. To evaluate the efficiency of this technique, an experimental scheme of EMAS was established according to the conventional stamping of cylindrical parts from aluminum and the formability encountered was discussed. Furthermore, a “multi-step, loose coupling” numerical scheme was proposed to investigate the deformation behaviors based on the ANSYS Multiphysics/LS-DYNA platform through establishing user-defined subroutines. The results show that electromagnetically assisted deep drawing can remarkably improve the formability of aluminum cylindrical parts. The proposed numerical scheme can successfully simulate the related Stamping-EMF process, and the deformation characteristics of sheet metal reflect experimental results. The predicted results are also validated with the profiles of the deformed sheets in experiments. 相似文献
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This paper describes the integration of two ICL Distributed Array Processors (DAPs) into a dual ICL 2976 configuration running the Edinburgh Multi-Access System (EMAS). The principles underlying the general multi-access service are not compromised; special scheduling arrangements provide effective control and use of the DAP resource while allowing multi-user access to the DAPs for DAP program development. 相似文献
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结合实际情况,对机轮作用下EMAS的破坏作用做了静力学分析.在此基础上,对系统作了适当的假设和简化,建立了含有耗散函数的Lagrange动力学方程.此外,运用MATLAB软件对该动力学模型进行了仿真,得到了飞机在X、Y方向上位移和速度随时间变化的曲线,较好地描述了真机在EMAS阻滞状态下的实际情况,验证了该系统模型的有效性,为飞机道面EMAS的进一步研究提供了有效的理论支持. 相似文献
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Michael W. Brown 《Software》1986,16(6):517-529
This paper describes the integration of initially one, and later a second, ICL Distributed Array Processor (DAP) into a dual ICL 2972 installation running the Edinburgh Multi-Access System (EMAS). The alterations made to each level of the operating system are briefly described, along with the methods for mounting some of the relevant ICL DAP compiler software. Software enhancements to enable multi-programming of the DAP and a locally designed method for DAP data area expansion are also described. A brief résumé of the user facilities available is included, along with operational policies and some utilization figures. 相似文献
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为建立磁脉冲辅助冲压成形(EMAS)工艺的有效性,采用准静态平面应变预拉伸和动态磁脉冲成形相结合的方法对5052-O铝合金板材的准静态/动态平面应变状态复合成形极限进行了试验研究.结果表明:准静态/动态复合加载过程能显著改善该铝合金板材的室温成形性;准静态/动态平面应变复合成形极限比准静态平面应变成形极限有显著提高,相似或者略高于完全磁脉冲平面应变成形性,且随着准静态预应变水平的增加,准静态/动态复合变形成形极限变化不大.预变形的存在不会削弱复合成形过程的极限变形能力. 相似文献