| Summary: | 碩士 === 國立高雄應用科技大學 === 模具工程系 === 105 === The rotors and stators of motors or generators as well as the cores of transformers are produced by progressive stamping and lamination-riveting. Failure in lamination -riveting leads to loosen in the laminated cores when encountered with crash or misalignment during winding. The most basic laminated riveting point in the form of circular, when the electromagnetic steel is thin, or because of low iron loss and poor ductility, you must change the V-shape riveting point, but the general industry for V-shape riveting point forming principle is still not very understanding, especially the appropriate punch/die clearance, and the best depth of the selection of riveting, is still only reference experience value.
In this study, the thickness of 0.5mm of the electrical steel plate, According to the iron loss materials are H1300, H600 and H470 respectively, to explore the die clearance, riveting depth, as well as the rolling direction of the plate on the anti-riveting effect: die clearance of 1%, 3% (0°), DD (45°), TD (90°), and so on. The thickness of the plate is 1t, 1.25t, 1.5t, 1.75t and 2t. Firstly, the influence of die clearance and riveting depth on the riveting surfaces was observed by geometrical illustrate method. Then, the effect of die clearance and riveting depth on the riveting force was simulated by DEFORM-2D plane strain model. Finally, Simulation results of influence of clearance and riveting depth on riveting force.
Geometric illustrate method shows that the various die clearance will correspond to different riveting depth, can get the most riveting surfaces, a variety of materials and a variety of die clearance will correspond to different riveting depth and then to achieve laminated phenomenon; simulation results show that the larger die clearance, riveting surfaces reduce the increase in the amount of interference, and the greater the riveting force, the other riveting depth from 1t to 1.5t, riveting surfaces increases, the greater the retreat force, riveting depth from 1.75t to 2t, due to impact to the next layer of steel base The results show that the larger the die clearance is, the deeper the riveting depth is, the better the riveting force is. In the three materials, the H1300 has the best riveting force, and the H1300 and H470 show the opposite Sexually, DD (45 °) has a better riveting force.
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