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彭文飞 《稀有金属材料与工程》2016,45(4):836-842
大型厚壁空心长轴类零件是工业装备中的关键零部件,文章采用多楔楔横轧成形该类零件。首先,推导多楔楔横轧长轴空心件的侧楔偏转角公式,为多楔楔横轧模具的设计奠定了基础。然后,研究展宽角对单楔楔横轧厚壁空心件的影响规律,发现相对于轧制小直径空心轴,展宽角的选择范围可以扩大,内孔椭圆度也能得到控制。同时发现模具的顶面脱空也能控制内孔椭圆度。最后,建立双楔楔横轧轧制大型厚壁空心长轴类零件的有限元模型,模拟了成形过程,监测对称面的内孔椭圆度,有限元计算的内孔椭圆度为4.98%,轧制实验值为5.56%。表明:双楔楔横轧大型厚壁空心长轴类零件是可行的。 相似文献
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A new method based on the multi-wedge translation mechanism is presented to calculate the lateral force acting on the stabilizing piles. At first, there is no assumption for the shape of potential sliding surface, it is just considered that the potential sliding surface is a composite of a number of straight lines. And then, the potential sliding mass is divided into a number of triangular wedges take with these straight lines as its base. The kinematic theorem of limit analysis is adopted to calculate the rate of external work and the rate of energy dissipation for each triangular wedge, respectively. Furthermore, the multivariate functions are established to calculate the lateral force acting on the stabilizing piles. The lateral force and the corresponding potential sliding surfaces can be obtained by an optimizational technique. At last, an example is taken to illustrate the method. The effect of soil strength parameters, slope angle and pile roughness on the lateral force and the corresponding potential sliding surface are analyzed.The result are compared with those obtained using other methods. 相似文献
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针对多楔带轮旋压过程中成形质量较差和旋轮寿命较低的问题,以东安513型发动机多楔带轮为研究对象,基于Deform平台对冷轧钢板08Al多楔带轮成形过程进行数值仿真,通过筛选旋压工艺参数,确定设计变量,并分析主轴转速、旋轮进给速度和旋轮半径对毛坯等效应力、旋轮成形载荷的影响;基于Design-Expert软件对旋压过程的各设计变量以多目标遗传优化算法进行优化设计,并通过试验验证了有限元仿真的可靠性。经过优化后,成形后的带轮等效应力减少了39 MPa,旋轮所受成形载荷减小了10.64%。 相似文献
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目的为研究带长法兰汽车多楔轮的结构稳定性,实现零件轻量化,对多楔轮结构进行仿真研究和优化设计。方法通过建立有限元模型,使用ANSYS有限元软件进行不同齿数结构汽车多楔轮静动态分析,研究其变形量、应力分布规律及固有频率的变化情况。结果仿真结果表明,一阶至六阶的固有频率为56.62~1691.90 Hz,三齿为多楔轮最优齿数结构,其结构稳定性好,传动效率高。结论在实际工况中,激励源应避免出现在x轴和z轴方向。结构优化后的带长法兰汽车三齿多楔轮质量减少了3.2%,刚度基本不变,强度增加,为汽车多楔轮实际结构设计提供了一定的参考价值。 相似文献
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