A finite element model describing the drawing process of the heat - shield panel of automobile engine is established by using the commercial dynamic explicit code ls - dyna 摘要使用基于动态显式算法的商业软件ls - dyna建立了某汽车发动机隔热罩拉延成形的有限元模型，通过所建立的有限元模型分析了压边力对拉延成形的影响。
The springback angle increases with the increase of the punch round radius and clearances between the punch and the die while decreases with increase of the blank holder force , sheet thickness , friction coefficient and material hardening exponent 回弹角随凸模圆角半径和凸凹模间隙的增大而增大，随压边力、板料厚度、摩擦系数和材料硬化指数的增大而减小。
Therefore , drawbead is employed together with bhf to control the drawing process , and several typical layouts of drawbead are analyzed and compared via fea ( finite element analysis ) , with the most effective one then being applied to stamping experiments 因此，文中采用拉延筋和压边力来共同控制拉延成形，并通过有限元分析比较了几种典型的拉延筋布置方案，选择其中最有效的一种进行试冲试验。
It is well known that additional stretching of the material in the unsupported wall area may prevent wrinkling , and this can be achieved in practice by increasing the blank - holder force ; but the application of excessive tensile stresses leads to failure by tearing 我们知道在不被支撑的拉伸壁区域中材料的外力拉伸可以防止起皱，这可以在实践中通过增加压边力而实现，但是运用过大的拉伸力会引起破裂失效。
The non - uniform deformation behavours and the movement of the weld seams , the wrinkling of the workpieces and the methods to control the non - uniform deformation were investigated by adjusting the die structures , the blank holding method and the blankholding force distribution 通过调整模具结构和压边方法及压边力分布，对坯料不均匀变形规律及焊缝的移动规律、坯料的起皱规律及控制坯料不均匀变形的方法进行了探讨研究。
In this paper , the evaluation function of the formability of rectangle - box deep drawing was established , the effects of variable blank holder forces ( spatially ) on the formability of rectangular box deep drawing process was investigated based on the numerical simulation of sheet metal forming , the control strategy of the variable blank - holder forces in rectangular box has been developed to improve the formability and to increase the attainable pan height 本文通过对随位置变化的变压边力作用下的矩形盒拉深过程进行数值模拟，研究各部位压边力变化对整体成形性能影响、及其影响范围，为分块压边圈的压边力的调整提供一定的依据。
This paper referred to the massive domestic and foreign technical material , elaborated in the sheet forming value simulation theory essential technology in detail , points out when analysis sheet forming question should use the big distortion ball plasticity fem and introduce the application characteristic and the function summarizes of the sheet forming simulation software dynaform . secondly , analyzed the cover forming characteristic , simultaneously introduced the influence cover forming factor in detail : such as ramming direction , the craft addendum surface and the material pressing surface , the radius of convex - concave mold , draw bead , pressure strength , blank size and craft margin and so on . and simulates many typical automobiles cover panel with software : such lateral board , back taillight pedestal and storage cover 其次,分析了覆盖件成形的特点和要求,同时详细介绍了影响覆盖件成形的因素如冲压方向、工艺补充面和压料面、凸凹模圆角、拉延筋、压边力、坯料尺寸和工艺切口等,并用数值模拟软件对多个典型的汽车覆盖件汽车后侧围板、后灯座以及轿车后备箱盖的冲压成形情况进行模拟,用模拟结果优化拉延工艺方案,比较了内覆盖件和外覆盖件在成形特点和要求的一些异同点,以及常见的起皱、拉裂和回弹、成形不足等缺陷的产生机理和相应对策,重点介绍工艺补充面和压料面的设计及优化方法,因为拉延是冲压工艺的关键工序,而工艺补充面和压料面的设计是拉延工序的关键,对消除缺陷至关重要。
To study the effect of the blank - holding on the result of the multi - point forming ( mpf ) , the numerical simulations were performed for the rigid and flexible blank - holding in the 3 - d surface large deformation mpf process by means of a dynamic explicit fem software and both of the forming results were compared 摘要为了研究不同的压边方式对多点成形结果的影响，采用动力学显式有限元软件对大变形量三维曲面多点成形过程中刚性压边与柔性压边方式进行了数值模拟，对比了二者的成形结果，并且对不同压边力时的柔性压边成形进行了探讨，研究了柔性压边方式的成形规律。
On the basis of the sketch of use and significance of blank - holder force in production , the effects on the formability of box deep drawing process were investigated with the dynaform , which was applied to the variable blank - holder force ( vbhf ) changing with the deep drawing time and the position of the vbhf 在概述压边力在生产过程中的用途和意义的基础上，讨论了变压边力对薄板拉深成形过程的影响，利用dynaform模拟软件研究了随拉深时间和压边圈位置变化的压边力对拉深成形质量的影响，得到了相应的数值模拟结果，为实际生产过程中合理调节压边力的大小提供了理论依据。
