Measurement of forces on multi-point forming tools using fibre Bragg grating sensors
Measurement of forces on multi-point forming tools using fibre Bragg grating sensors
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DOI：
10.1177/0954405419875334
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发表时间：
2020-02
期刊：
影响因子：
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通讯作者：
A. Elghawail;D. Pham;Jun Huang;S. Su;Mairi Kerin;C. Ji;M. Abosaf;K. Essa
中科院分区：
文献类型：
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作者：
A. Elghawail;D. Pham;Jun Huang;S. Su;Mairi Kerin;C. Ji;M. Abosaf;K. Essa
多点成形利用施加到工具（包括设置在不同高度的多个销钉）上的力来形成白色家电、汽车车身、飞机框架等镶板的金属板材。多个销钉的使用可以实现工具的快速更换和灵活性，使其适合小批量和原型组件制造。为了探索金属板从工具释放时的“回弹”与所施加的销力之间的关系，首先需要了解和测量成形力。本文提出了一种使用光纤布拉格光栅传感器测量多点成形工具中各个销钉上的成形力的新颖方法，从而监测成形过程中所选销钉上的弹性应变。介绍了使用光纤布拉格光栅测量成形力的工作原理，并建立了最终卸载后成形零件的回弹与在销尖端和工件之间的弹性垫的不同压缩比（30%、40%、50%和60%）下在选定的单个销上测量的成形力之间的关系。实验验证了所提出的测量方法，结果表明所提出的方法检测到的成形力与数值模拟获得的结果具有良好的相关性。这表明所提出的方法对于实时测量和监测成形过程中多点成形工具的成形力分布具有良好的潜力。
Multi-point forming uses forces applied to a tool, comprising of multiple pins set at different heights, to form sheet metal for panelling in white goods, automotive bodywork, aircraft frames and so on. The use of multiple pins allows for rapid change over and flexibility in the tool making it suitable for small-batch and prototype component manufacture. To explore the relationship between ‘springback’ of the sheet metal on release from the tool, and the applied pin force, it is first necessary to understand and measure the forming forces. This article presents a novel method of measuring forming forces on individual pins in a multi-point forming tool using fibre Bragg grating sensors, monitoring the elastic strain on the selected pins during the forming process. The operating principles behind forming force measurements using fibre Bragg gratings are introduced and a relationship is developed between springback in the formed part after the final unloading and the forming force as measured on selected individual pins under different compression ratios (30%, 40%, 50% and 60%) of the elastic cushion between the tips of the pins and the workpiece. Experiments were performed to validate the proposed measuring method, and results indicate that forming forces detected by the proposed method correlated well with the results obtained by numerical simulation. This suggests the proposed method has good potential for real-time measurement and monitoring of forming force distribution in multi-point forming tools during the forming process.