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热轧F1减速机是某钢厂主轧线上的关键机械设备,为德国生产。针对其在使用过程中大齿轮辐板出现裂纹,严重影响设备的安全生产问题,利用有限元计算和强度分析的方法对其大齿轮进行了计算,结果为找出其裂纹产生的原因和制定出大齿轮改造的实施方案,提供了理论依据。并证明其输出轴大齿轮理论汁算的危险部位与实际裂纹产生的部位完全吻合。 相似文献
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这里详细论述了板料成型性能指数n、r值的物理意义及其对各种钣金零件成型工艺性的影响,结合典型成型工艺,利用钣金冷压成型原理,对n、r值的具体影响进行了分析研究,得出了一些针对具体成型工艺的一般规律性的结论。将这里的一些概念和分析研究的结果同具体的生产实践相结合,则会对促进生产和提高成型件的质量有一定的指导意义。 相似文献
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On basis of the finite element software DEFORM, the 2D coupled thermo-mechanical model of continuous drive friction welding of ring parts is established. The temperature and the flashes during the welding process are investigated. The results of numerical simulation show that the temperature of friction surface is higher than that of other region and the peak temperature increases with the increase of welding time. During the process of friction stage, no flash appears because of the low temperature and the small axial friction pressure. At the forging stage, the flashes appear, whose dimensions and bending degree increase with the increase of welding temperature. Moreover, with the increase of rotational velocity and axial forging pressure, the dimensions and the bending degree of flashes of continuous drive friction welding increase. 相似文献
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通过建立建筑工程所在区域的三维地质模型,建筑设计和施工人员可对复杂地质条件进行分析和研究,为城市建设提供技术支撑。基于盛京金融广场项目勘探钻孔数据及地层分层资料,采用GTP建模方法,根据钻孔数据中岩层接触关系,从新到老、自上而下逐层自动创建三维地层模型。经交叉剖切分析检验,建立的三维地质模型与实际勘探数据拟合度较好,准确客观地反映了研究区域内的地层地质条件。本文通过对三维地质模型进行研究,分析了研究区域工程地质条件及施工过程的潜在风险,提出了风险管控措施,可为建筑物设计、施工和风险防控提供科学决策依据,具有较高的推广价值。 相似文献
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利用有限元方法对液压快锻机中横梁进行了细致的建模,依此提出了几点建议。可以作为液压快锻机中横梁设计和结构改进的理论参考。 相似文献
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Effect of refilling time on microstructure and mechanical properties of friction spot welded LY12 aluminum alloy
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Friction spot welding (FSpW) was successfully used to produce joints of LY12 aluminum alloy. The effects of refilling time on microstructure and mechanical properties of FSpW joints were systematically studied. Results show that the cross-section of FSpW joint presents a basin-like morphology. A white bonding ligament exists in the center of the joint. The stir zone can be clarified into sleeve affected zone and pin affected zone based on different grain sizes. With increasing the refilling time from 2.0s to 3.5s, grains in the stir zone become coarser, microhardness of the joint decreases and tensile shear failure load of the joint firstly increases and then decreases. The maximum tensile shear failure load of 8 130 N is attained when the refilling time is 3.0s. Shear-plug fracture mode and shear fracture mode can be observed in the tensile shear tests. The maximum hardness of 169.7 HV is attained in the joint center when the refilling time is 2.0s. 相似文献