Closed loop springback control in progressive die bending by induction heating

Closed loop springback control in progressive die bending by induction heating
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感应加热级进模弯曲中的闭环回弹控制

DOI:
10.1007/s12541-015-0314-8
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发表时间:
2015
影响因子:
1.9
通讯作者:
Tekkaya
Tekkaya
中科院分区:
工程技术4区
文献类型:
--
作者:
Löbbe;Becker;Tekkaya

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级进模中高强度钢的大回弹阻碍了精确制造,因为由于材料变化、工具磨损和变化的环境条件而无法正确预测弹性卸载。为了补偿脆性材料弯曲时的回弹并提高成形极限,开发了一种在线感应加热级进模温弯曲技术。在一定的温度范围内,与回弹角存在线性关系,这可以直接影响最终的弯曲角度。基于这一原理,实现了卸载后角度反馈的闭环控制,调节弯曲前的板材温度。通过开发的离散控制器,最终实现了稳定、快速的控制模式,使得与目标值的初始偏差减小到小于Δθ=±0.30°。
Large springback of high strength steels in progressive dies hinders accurate manufacturing because a proper prediction of elastic unloading is not possible due to material variations, tool wear, and varying ambient conditions. In order to compensate springback and enhance the forming limit when brittle materials are bent, a warm bending technology for progressive dies through inline induction heating is developed. Within a certain temperature range, there is a linear relation to the springback angle, which allows a direct influence on the final bending angle. Based on this principle, a closed loop control with a feedback of the angle after unloading is implemented, which adjusts the sheet temperature before bending. With the developed discrete controller, finally a stable and fast control mode is achieved so that an initial deviation from the target value is reduced to less than Δθ = ±0.30°.
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