共查询到19条相似文献,搜索用时 875 毫秒
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在综合分析材料热物理性能和力学性能的基础上,建立了板料激光弯曲成形的三维热力耦合模型。利用有限元分析软件对1Cr17Ni2不锈钢板的激光单次扫描弯曲过程进行了数值模拟,得到了应力一应变场模拟结果。模拟结果表明,当高能激光束沿板料表面扫描,在板厚方向会产生强烈的温度梯度,致使加热区材料的塑性应变沿板厚方向差别很大,从而导致板料的弯曲变形。 相似文献
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对常用宇航钣金材料不锈钢1Cr18Ni9Ti、铝合金7A09、5A06、2A14、2A12及钛合金TC4进行成形极限的实验研究,得到1Cr18Ni9Ti、2A14、5A06及2A12室温下的FLD,并建立其FLD计算模型。实验结果表明,1Cr18Ni9Ti室温下的成形性能明显高于2A12、2A14和5A06,且金属板料厚度对其成形极限影响较大,板料越薄,成形极限越低。铝合金7A09及钛合金TC4在室温下的塑性成形性能极差,无法得到其室温下的FLD。 相似文献
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利用激光作为热源使金属板料在无模具下发生热塑性变形是一种新的成形方法。文章分析了板料激光弯曲的基本原理,通过试验对影响板料激光弯曲的主要因素的变化规律作了系统的研究,对试验曲线做了定性分析,其结果可以为工程应用提供依据。 相似文献
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The laser bending of single-crystal silicon sheet (0.2 mm in thickness) was investigated with JK701 Nd:YAG laser. The models were developed to describe the beam characteristics of pulsed laser. In order to simulate the process of laser bending, the FEM software ANSYS was used to predict the heat temperature and stress-strain fields. The periodic transformation of temperature field and stress-strain distribution was analyzed during pulsed laser scanning silicon sheet. The results indicate that the mechanism of pulsed laser bending silicon is a hybrid mechanism in silicon bending, rather than a simple mechanism of TGM or BM. This work also gets silicon sheet bent after scanning 6 times with pulsed laser, and its bending angle is up to 6.5°. The simulation and prediction results reach well agreement with the verifying experiments. 相似文献
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激光加热弯曲成型技术 总被引:1,自引:0,他引:1
板材激光加热弯曲成形是近年来提出的一种先进的零件成形方法。通过对金属板材激光加热弯曲成型的特点分析,探讨了激光加热弯曲成型的机理,同时对这一技术的发展现状作了归纳并对其发展进行了展望。 相似文献
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激光弯曲工艺中板材厚度的影响规律 总被引:11,自引:0,他引:11
用大变形弹塑性有限元法对金属板材柔性成形新工艺———激光弯曲进行了动态数值模拟。从热学及热力学的观点出发,阐明了该工艺的变形机理,建立了弯曲过程中的应力模型;论证了板料厚度对温度梯度和弯曲角度的影响,提出了能够实现激光弯曲工艺的最小相对光束半径的新概念,为该工艺进一步深入研究奠定了基础。模拟结果与试验吻合较好。 相似文献
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WANG Xu-yue XU Wei-xing XU Wen-ji HU Ya-feng LIANG Yan-de WANG Lian-ji Key Laboratory for Precision Non-traditional Machining Technology of the Ministry of Education Dalian University of Technology Dalian China 《中国有色金属学会会刊》2011,(Z1):188-193
The laser bending of single-crystal silicon sheet (0.2 mm in thickness) was investigated with JK701 Nd:YAG laser. The models were developed to describe the beam characteristics of pulsed laser. In order to simulate the process of laser bending, the FEM software ANSYS was used to predict the heat temperature and stress-strain fields. The periodic transformation of temperature field and stress-strain distribution was analyzed during pulsed laser scanning silicon sheet. The results indicate that the mechanism of pulsed laser bending silicon is a hybrid mechanism in silicon bending, rather than a simple mechanism of TGM or BM. This work also gets silicon sheet bent after scanning 6 times with pulsed laser, and its bending angle is up to 6.5o. The simulation and prediction results reach well agreement with the verifying experiments. 相似文献
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《CIRP Annals》2019,68(1):277-280
Laser bending by means of the temperature gradient mechanism (TGM) has so far been limited to bending the free end of a sheet metal strip toward the irradiating laser beam. This investigation aims to present a new approach which, despite one-sided accessibility, allows targeted incremental laser bending in both directions by the TGM and the upsetting deformation mechanism (UM). The method is based on blind holes along the bending line, whereby the bend direction can be determined by irradiating either the blind hole bottoms or the bridges between the holes. The possibility of bidirectional and alternating laser bending is demonstrated. 相似文献
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钛合金板料激光曲线弯曲及热辐射对其组织性能的影响 总被引:11,自引:0,他引:11
研究了激光能量密度、路径曲率和扫描次数对TC4(Ti-6Al-4V)板料弯曲变形的影响规律,同时,分析了热辐射对板料显微组织和表面硬度的影响。结果表明:(1)存在一个最的能量密度值使板料一次弯曲所获得的的弯曲角度达到峰值;(2)随路径曲率的增加,弯曲角度减小;(3)第一次扫描以后的扫描次数与弯曲角度呈准线性关系。(4)合适的工艺参数不会导致材料显微组织变化,且激光热辐射对材料表面有淬火效应,使加热区材料表面硬度均有所提高。 相似文献