基于激光冲击动态力学效应的薄板变形特性与控制

激光冲击成形技术用于微细薄板拉深成形，有望改善传统成形中的高昂模具费用及摩擦效应问题。采用纳秒高能短脉冲激光诱导冲击动态压力载荷，研究了激光能量密度在15.1~27.0 J/cm2范围内薄板工件的激光冲击动态拉深半模成形的变形量变化规律与成形极限，实验观察到了逆向形变的发生。分析结果表明表面逆向形变是工件在激光冲击载荷作用下撞击下模底面后反弹而产生的。进一步研究了激光能量密度对逆向形变的影响，提出了通过降低激光脉冲能量、由单脉冲到多脉冲作用的方法改善逆向回弹，有效实现了较高的模具贴合程度。

Abstract

Laser peen forming, while applied in the deep drawing of metal sheet, is hopeful to cut down the cost of molds and reduce the friction effect in traditional micro deep drawing. Using dynamic and mechanical load induced by high-energy nanosecond laser pulses, deformation of metal sheets under laser fluence of 15.1~27.0 J/cm2 is investigated, during which bulging effect is observed. The results show that the bugling occurs when the metal sheet collides with the die under the load induced by laser pulse. Moreover, experiment on bulging effect under different laser fluences is performed. Possible controlling method is presented through lowering laser fluence and starting from single pulse to multiple pulses, which can improve the molding rate.

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郭永升, 孙霄川, 羊茜, 胡永祥. 基于激光冲击动态力学效应的薄板变形特性与控制[J]. 激光与光电子学进展, 2015, 52(8): 081402. Guo Yongsheng, Sun Xiaochuan, Yang Xi, Hu Yongxiang. Fabrication and Controlling of Metal Sheets Based on Dynamic and Mechanical Effect of Laser[J]. Laser & Optoelectronics Progress, 2015, 52(8): 081402.

基于激光冲击动态力学效应的薄板变形特性与控制

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