Shape Prediction of the Sheet in Continuous Roll Forming Based on the Analysis of Exit Velocity.
Shape Prediction of the Sheet in Continuous Roll Forming Based on the Analysis of Exit Velocity.
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基于退出速度分析的连续滚压成型板材形状预测。
DOI：
10.3390/ma14185178
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发表时间：
2021-09-09
期刊：
影响因子：
--
通讯作者：
Cai ZY
中科院分区：
文献类型：
--
作者：
Gao JX;Chen QM;Sun LR;Cai ZY
连续滚压成型（CRF）是一种将连续成型和多点成型相结合来生产三维（3D）曲面的新技术。与其他方法相比，CRF的设备非常简单，仅包括一对可弯曲的工作辊和相应的形状调整和支撑组件。成形时通过控制上下辊的弯曲形状和辊缝的大小，可以生产出不同形状的双曲率曲面。本文给出了板材出口速度的简化表达式，并进一步推导了纵向曲率半径的计算公式。从出口速度分布角度深入探讨了纵向半径实际值与预测值差异的原因。采用响应面法，分析了最大压缩比、板材宽度、板材厚度、横向曲率半径对纵向曲率半径的影响。同时，得到正、负高斯曲率面的预测公式的修正系数分别为1.138和0.905。通过数值模拟和成形实验验证了修正公式的有效性和实用性。
Continuous roll forming (CRF) is a new technology that combines continuous forming and multi-point forming to produce three-dimensional (3D) curved surfaces. Compared with other methods, the equipment of CRF is very simple, including only a pair of bendable work rolls and the corresponding shape adjustment and support assembly. By controlling the bending shapes of the upper and lower rolls and the size of the roll gap during forming, double curvature surfaces with different shapes can be produced. In this paper, a simplified expression of the exit velocity of the sheet is provided, and the formulas for the calculation of the longitudinal curvature radius are further derived. The reason for the discrepancy between the actual and predicted values of the longitudinal radius is deeply discussed from the perspective of the distribution of the exit velocity. By using the response surface methodology, the effects of the maximum compression ratio, the sheet width, the sheet thickness, and the transverse curvature radius on the longitudinal curvature radius are analyzed. Meanwhile, the correction coefficients of the predicted formulas for the positive and negative Gaussian curvature surfaces are obtained as 1.138 and 0.905, respectively. The validity and practicability of the modified formulas are verified by numerical simulations and forming experiments.
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