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首页> 外文期刊>The International Journal of Advanced Manufacturing Technology >Closed-loop control of the blank holding force in sheet metal forming with a new embedded-type displacement sensor
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Closed-loop control of the blank holding force in sheet metal forming with a new embedded-type displacement sensor

机译：新型嵌入式位移传感器对钣金成形中的毛坯夹持力进行闭环控制

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摘要

Imposing an adaptable blank holding force (BHF) on the flange is an effective technique used to suppress the tendency towards sidewall tearing and to restrain the flange from wrinkling during sheet forming. To this goal, a novel photoelectric displacement sensor was adopted to detect the movement of sheet metal on the die shoulder, and a LVDT (linear variable displacement transducer) placed on the upper die was used to measure the wrinkle height during the process. The output of the PDS can be substituted into a simple formula to calculate the real-time minimum thickness of the sidewall. Together with the readout from the LVDT, the result of the calculation serves as feedback parameters for the BHF control. A tearing-wrinkling algorithm with two modes has been developed in the paper: the fixed-variance mode and the fixed-ratio mode. Beginning with very different initial values of BHF, the proposed BHF controls can attain formability at least as good as the optimal result of the test with constant BHF. The fixed-ratio mode enables the servo-system to react fast in high-speed operations. However, the uniformity of wall thickness is inferior to that of the fixed-variance control. In both cases, the optimal uniformity is obtained under the relatively low initial BHF, while a more uniform sidewall results in a smaller flange area and a product of lower final height is accordingly expected.
机译：在凸缘上施加适应的毛坯保持力（BHF）是一种有效的技术，用于抑制侧壁撕裂的趋势并限制凸缘在薄板成型过程中起皱。为此，采用了新型的光电位移传感器来检测钣金在模具肩部上的运动，并使用放置在上模具上的LVDT（线性可变位移传感器）来测量过程中的皱纹高度。可以将PDS的输出代入一个简单的公式，以计算侧壁的实时最小厚度。与LVDT的读数一起，计算结果用作BHF控制的反馈参数。本文开发了一种具有两种模式的撕裂起皱算法：固定方差模式和固定比率模式。从非常不同的BHF初始值开始，建议的BHF控件至少可以获得与恒定BHF的最佳测试结果一样好的可成形性。固定比率模式可使伺服系统在高速操作中快速反应。但是，壁厚的均匀性不如固定方差控制的均匀。在这两种情况下，在相对较低的初始BHF下都能获得最佳的均匀性，而更均匀的侧壁会导致较小的凸缘面积，因此可以期望得到较低的最终高度。

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