板金雷射成形之有限元素分析; Thermal-mechanical analysis on the laser forming process of sheet metals

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题名:	板金雷射成形之有限元素分析;Thermal-mechanical analysis on the laser forming process of sheet metals
作者:	林峻葳;Jiunn-Uei Lin
贡献者:	機械工程研究所
关键词:	成形角度;雷射成形;bending angle;laser-forming
日期:	2006-06-30
上传时间:	2009-09-21 11:53:23 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	摘要本文應用MARC有限元素軟體分析雷射加工板材成形問題。為了解MARC應用於雷射成形問題的可靠性及妥適性，本文首先利用雷射加工板材成形的實驗驗證有限元素解的準確性，並分別探討加工製程中雷射功率、雷射光徑、板材厚度及掃描速度，在雷射加工成形為溫度梯度機制（Temperature gradient mechanism）下對成形角度的影響，進而提出成形角度之經驗公式與預測方法。 Abstract The laser-forming process is a new flexible forming process without rigid tools and external force. The laser beam is assumed to be Gaussian mode and the coupled thermo-elastoplastic problem is treated as three-dimensional. The deformation pattern of specimens have been calculated numerically and the transient response of the bending angle has been validated by experiments. The relationship between the bending angle and laser-forming parameters, such as laser power, spot size, thickness, and scan speed are studied in detail by FEM simulation. The research proposed formulate to calculate the bending angle successively.
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