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为避免工件端部与模具或压力机发生干涉,基于变形过程分析和一些假定,列出了忽略模具圆角的板料V型弯曲工件端点轨迹关于工件端部翘起角α的参数方程,证明了轨迹曲线极值坐标相应的端部翘起角αm由模料尺寸比l/L决定,当l/L大时,αm小,反之则大;凹模半角β≤(π/2)-αm,端点轨迹曲线才有极值。给定β和l/L可以决定凹模口外工件摆动区域大小,当l/L大时,区域小,反之则大。通过列方程和作图相结合,分析了在l/L=(0.50~0.30)范围内,增大凹模圆角、增大凸模圆角以及凹模圆角与凸模圆角叠加3种情况下的工件端部摆动区域的变化;给出了接近实际情况的工件中性层端点轨迹方程。最后指出,应视空间宽松程度不同,采取不同方法预留工件端部摆动区域。
In order to avoid the interference between the end of the workpiece and the die or the press, based on the analysis of the deformation process and some assumptions, the parametric equations about the end point lift angle α of the sheet-metal V-bend workpiece ignoring the mold fillet are listed, The curve of the end point of the trajectory curve corresponding to the elevation angle αm by the die size ratio l / L decision, when l / L is large, αm is small, otherwise large; die half-width β ≤ (π / 2) -αm , The endpoint trajectory curve has the extreme value. Given β and l / L can determine the size of concave workpiece outside the workpiece swing area, when l / L large, small area, and vice versa. Through the combination of column equation and plotting, it is analyzed that in the range of l / L = (0.50-0.30), increasing the fillet radius of the die, increasing the fillet radius of the die, and the superposition of the die fillet and the die fillet And the change of the swinging area at the end of the workpiece is given. The end-point trajectory equation of workpiece neutral layer is given. Finally, it is pointed out that depending on the degree of spatial easing, different methods should be adopted to reserve the swing area of the end of the workpiece.