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复杂薄壁零件激光快速成形过程的热力耦合场数值模拟
Thermo-mechanical Coupling Field Simulation of Complex Thin-wall Part Laser Rapid Prototype Process

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文摘 研究直接激光成形过程中叶片温度场与热应力场的关系,改善成形质量。以空心叶片为例,根据激光测量仪测得的散点图,用圆弧逼近得到叶片的近似轮廓。利用有限元软件MSC.Marc建立Ti-6Al-4V(TC4)圆弧逼近的空心叶片的有限元模型,并对激光直接成形过程进行数值模拟,得到叶片在成形过程以及冷却过程中的温度场和热应力场。随着成形的进行,由于热量的积累,成形叶片的温度不断升高,已成形部位的热应力随着成形过程的热循环不断变化,小曲率半径处的热应力大,且热循环对热应力变化影响较小;在直接激光成形结束后,整体温度开始下降,各处的热应力都逐渐升高。通过分析温度场和热应力场的分布情况,得到不同曲率半径对温度场和热应力场的影响规律。基于模拟结果,总结的规律和试验经验,提出改善成形质量的有效方法。并利用激光直接成形技术,加工出模拟分析模型的实物零件,验证模拟和结论的正确性。
其他语种文摘 The research is focused on the relationship between the thermal field and thermal stress field during the process of the blade direct laser forming, so as to improve the forming quality. A hollow blade has been taken as example. According to the blade scatter-plot measured by the laser measurement instrument, the blade outline is approximated by a series of arc splines. Using finite element software MSC.Marc, a finite element model of arc approximation of the Ti-6Al-4V (TC4) hollow blade is established, and the hollow blade of laser direct forming is simulated to acquire the thermal field and thermal stress field in the forming and cooling process. During the forming process, the temperature of the forming hollow blade is increased and thermal stress of the already formed parts constantly changes with the thermal cycle due to the heat accumulation. And the part with a smaller curvature radius has a greater thermal stress which is affected by thermal cycle slightly. After the forming process, the reduction of the whole temperature leads to the thermal stress of every part rising gradually. Moreover, analyzing the distribution of the thermal field and thermal stress field, the correlation between the curvature radius and thermal field and thermal stress field can be obtained. The forming method of improving the quality is put forward based on the simulation result, summarized correlation, and experience. Finally, the real part just like the simulation model is worked out by utilizing the laser direct forming technology to verify the correctness of the simulation and summarized relationship.
来源 机械工程学报 ,2013,49(5):191-198 【核心库】
DOI 10.3901/jme.2013.05.191
关键词 热力耦合场 ; 激光直接成形 ; 钛合金 ; 数值模拟
地址

中国科学院沈阳自动化研究所, 沈阳, 110016

语种 中文
文献类型 研究性论文
ISSN 0577-6686
学科 金属学与金属工艺;机械、仪表工业
基金 国家教育部新世纪优秀人才支持计划
文献收藏号 CSCD:4785194

参考文献 共 13 共1页

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引证文献 7

1 徐辉丽 焊接快速成形技术的发展现状 材料导报,2015,29(6A):114-118
被引 4

2 卢庆华 不同冷却条件下激光焊接接头性能研究 机械工程学报,2015,51(10):41-47
被引 1

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