A Transfer Function Description of Sheet Metal Forming for Process Control
A Transfer Function Description of Sheet Metal Forming for Process Control
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DOI：
10.1115/1.2899621
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发表时间：
1991-02
期刊：
影响因子：
--
通讯作者：
R. D. Webb;D. Hardt
中科院分区：
文献类型：
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作者：
R. D. Webb;D. Hardt
金属板零件的三维成形通常使用一个或两个成形工具（模具）来完成，成形工具（模具）赋予必要的复杂曲率并引起足够的面内应变以用于零件强度和形状稳定性。本研究提出了一种方法，应用闭环过程控制的概念，以板成形的方式，自动收敛后，适当的模具设计。控制复杂变形的问题被减少到一个系统识别问题，其中模具部分的变换是作为一个空间频域传递函数。该传递函数简单地是零件和模具的空间频率含量的测量变化的比率。然后表明，这样的传递函数可以用来实现闭环过程控制，通过快速模具重新设计。轴对称成形实验，建立适当的线性传递函数的描述（通过叠加测试），并证明所提出的控制方法的收敛性能
Three-dimensional forming of sheet metal parts is typically accomplished using one or two shaped tools (die) that impart the necessary complex curvature and induce sufficient in-plane strain for part strength and shape stability. This research proposes a method of applying closed-loop process control concepts to sheet forming in a manner that automatically converges upon the appropriate tooling design. The problem of controlling complex deformation is reduced to a system identification problem where the die-part transformation is developed as a spatial frequency domain transfer function. This transfer function is simply the ratio of the measured change in spatial frequency content of the part and the die. It is then shown that such a transfer function can be used to implement closed-loop process control via rapid die redesign. Axisymmetric forming experiments are presented that establish the appropriateness of the linear transfer function description (via a test of superposition) and demonstrate the convergence properties of the proposed control method