| 基板预热对激光金属沉积成形过程热应力的影响 |
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| 引用本文： | 龙日升,刘伟军,邢飞,王华兵,卞宏友.基板预热对激光金属沉积成形过程热应力的影响[J].机械工程学报,2009,45(10). |
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| 作者姓名： | 龙日升 刘伟军 邢飞 王华兵 卞宏友 |
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| 作者单位： | 1. 中国科学院沈阳自动化研究所,沈阳,110016;中国科学院研究生院,北京,100039
2. 中国科学院沈阳自动化研究所,沈阳,110016 |
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| 基金项目： | 国家高技术研究发展计划资助项目(863计划,2002AA420060) |
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| 摘 要： | 为降低沉积过程的热应力,抑制成形过程中裂缝的产生,研究基板预热对激光金属沉积成形(Laser metal deposition shaping,LMDS)过程热应力的影响具有非常重要的意义。根据有限元分析中的"单元生死"思想,利用APDL(ANSYS parametric design language)编程建立多道多层激光金属沉积成形过程的数值模拟模型,深入探讨基板未预热和预热到400℃时对成形过程热应力的影响。计算结果表明,基板预热到400℃可以显著降低成形过程中试样的热应力变化波动性,试样的Von Mises热应力最大值可降低10%左右,其中x方向热应力最大值可降低8.5%左右,z方向热应力最大值可降低8.1%左右。在与模拟过程相同的条件下,利用自行研制的激光金属沉积成形设备进行了成形试验,成形试验的结果与模拟结果基本吻合。
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| 关 键 词： | 激光金属沉积成形 基板预热 热应力 数值模拟 |
Effects of Substrate Preheating on Thermal Stress during Laser Metal Deposition Shaping |
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| LONG Risheng, LIU Weijun XING Fei, WANG Huabing, BIAN Hongyou.Effects of Substrate Preheating on Thermal Stress during Laser Metal Deposition Shaping[J].Chinese Journal of Mechanical Engineering,2009,45(10). |
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| Authors: | LONG Risheng LIU Weijun XING Fei WANG Huabing BIAN Hongyou |
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| Affiliation: | 1. Shenyang Institute of Automation;Chinese Academy of Sciences;Shenyang 110016;2. Graduate School;Beijing 100039 |
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| Abstract: | In order to decrease the thermal stress and suppress the generation of cracks during LMDS process,it is of great importance to understand the effects of substrate preheating on thermal stress. According to the "element birth and death" technique of finite element analysis (FEA),a three-dimensional multi-track and multi-layer numerical simulation model for LMDS is developed with APDL. Through the model,the effects of preheating on thermal stress are deeply researched by setting the temperature of substrate a... |
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| Keywords: | Laser metal deposition shaping Substrate preheating Thermal stress Numerical simulation |
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