Table 2 - uploaded by Siliang Yan
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Detailed materials types, mesh types and sizes for finite element-boundary element model.
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... geometric model is shown in Fig. 1, in which the detailed material types, mesh types and sizes are shown in Table 2. 32432 solid finite elements are used to discretize the deformable sheet blank, and five layers of elements are assigned in the thickness direction to guarantee the solution precision of the thickness deformation. ...
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Citations
... Xie et al. 69 applied a method of discrete deposition and segregated heat-treatment to fabricate the large-scale component. Yan et al. 70 optimized the electromagnetic incremental forming scheme to form the large thinwalled component. ...
The study summarized the characteristics of large board and shaft components. The high-end large machine equipment and clamping devices should be developed in machining for high requirements. Additionally, some non-conventional methods have became a increasing for large components. For measurements, the developing and advanced methods were summarized, and the compensation methods were also complement to realize the high precision and efficiency. If that the component’s size has greatly exceeded the range of the current equipment, the mobile equipment are recommended for machining and measurement, and its detection technology is developed essentially for multiple mobile ones. Thus the study has guiding significance for achieving the high-precision and efficiency machining and measurement for large components, which is a great need in related industries.
... Composite processes combined with other technologies, such as magnetic pulse assisted forming and electromagnetic progressive forming, have also led to the development of electromagnetic forming stepping into a new level [10,11]. At present, electromagnetic forming has been a lot of research in the fields of aluminum alloy, magnesium alloy, etc. [12][13][14][15][16][17]. Kuroda [18] studied the dynamic response and related constitutive models of interstitial atomic steel under different strain rates. ...
In this paper, the effects of strain rate on the mechanical properties of DP780 were analyzed by quasi-static tensile test and Hopkinson bar test; Johnson-Cook constitutive model with high strain rate was established. Based on ANSYS/LS-DYNA finite element program, the finite element simulation of electromagnetic forming process of high-strength steel sheet under the action of driving plate was realized, and the influence of various process parameters on the forming height was studied. The results showed that the yield strength and ultimate tensile strength of the material increased with high strain rate, and DP780 high-strength steel had certain strain rate sensitivity. The drive sheet receives the maximum magnetic field force near the outermost two-turn coil. The deformation of high-strength steel plate mainly occurs under the action of impact inertia. The peak forming height increases with the rise of discharge frequency. The increase of the thickness of the drive sheet can reduce the forming efficiency.
... Wang et al. [23] proposed a coil for large-scale parts of aluminum using the EMIF method and carried out trial experiments. Yan et al. [24] carried out simulation and experimental studies on EMIF of large-scale parts of aluminum and found that wrinkling occurred in the forming process was caused by stress waves in sheet metal. Li et al. [25] analyzed the stress wave propagation in EMIF process of large-scale parts of aluminum and studied the influence of forming voltage, discharge position, and other parameters on the local humps and depression defects. ...
For the manufacturing of large-scale sheet parts, traditional stamping, spinning, and single-point incremental forming are limited by the rupture prone and severe springback of the formed parts and the requirement of large-scale forming equipment. In this paper, the method of electromagnetic incremental forming (EMIF) based on dual coil was creatively proposed to solve the manufacturing problem of large-scale parts of aluminum alloy. The forming results of EMIF based on single coil and EMIF based on dual coil are compared by finite element simulation. The effect of the two moving strategies on uniformity in EMIF based on dual coil was researched. In addition, the effect of the shaping voltage on uniformity in EMIF based on dual coil with the interval moving strategy was studied. It was observed that the forming quality of EMIF with dual coil was better than that of EMIF with single coil. For EMIF based on dual coil, the interval moving strategy is better than the sequential moving strategy in achieving better forming quality. For the first layer of EMIF based on dual coil with the interval moving strategy, the optimized forming voltage and shaping voltage were 12 kV and 18 kV, respectively. For the second layer of EMIF based on dual coil with interval moving strategy, the optimized forming voltage and shaping voltage were 18 kV and 27 kV, respectively. The shaping voltage was 1.5 times of forming voltage for both layers so that better forming uniformity was achieved. Then, the method of EMIF based on dual coil with interval moving strategy by multilayers is proposed to fabricate large-scale sheet parts. Finally, experiments were performed to confirm the feasibility of EMIF with dual coil, and the experiment results show good agreement with the simulation results. The findings of this work could provide guidance on deform large-scale parts of aluminum alloy by the EMIF method.
