冲压模具的受力分析

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冲压模具的受力分析(中文3800字,英文2900字)
   文章摘要:我们用一台多工位自动压力机来研究冲压模具的变形过程,其中包括突然换位,校准特征等一系列的过程。模具载荷实验实际上是对12个工位使用新的负载监控后的测量(其测量的数值将会输入计算程序)。再基于有限元法对冲压模具进行分析(其中有限元法需要用到一个计算代码和MSC/NASTRAN分析软件)。这样后再将分析扩展到其他的模具,特别是那些高负载的冲模。应力和变形是用来评估模具载荷对称还是非对称的条件,根据我们对模具独立的分析发现在模具的应力和变形只要是轻度的那这个模具还是好的。然而这种情况在当冲压模具最终和压力机成为一个整体后也是可能会变化的。
简介:
    钣金零件需要拉伸,剪切,弯曲,和挤压等一系列的操作,所有这些操作的进行都会被安置在多工位自动压力机上。材料是通过给料机送入压坯,在操作中材料通过同步机制的滑块运动从一个位置运动到下一个位置。在生产中每一个模具都是一个独立的单位,其都可以在主滑动上进行单个调整。如图1所示一个用热轧钢板做的汽车零件其不需要退火的12个加工步骤。
     
外文文献
Abstract:
  Experimental and computational procedures for studying deflections, flit, andalignment characteristics of a sequence of stamping dies, housed in a transfer press, are pre-sented. Die loads are actually measured at all the 12 die stations using new load monitors and  used as input to the computational procedure. A typical stamping die is analyzed using a computational code, MSC/NASTRAN, based on finite element method. The analysis is then extended to the other dies, especially the ones where the loads are high. Stresses and deflections are evaluated in the dies for the symmetric and asymmetric loading conditions. Based on our independent die analysis, stresses and deflections are found to be reasonably well within the tolerable limits. However, this situation could change when the stamping dies are eventually integrated with the press as a total system which is the ultimate goal of this broad research program.