金属微喷熔滴沉积成形工艺数值模拟与验证

发布时间：2018-05-04 19:18

本文选题：微喷熔滴沉积成形 + 铝合金　；参考：《稀有金属材料与工程》2017年05期

【摘要】：采用半隐式压力关联算法,通过引进VOF函数和分段线性界面结构(PLIC)构建自由曲面,建立了微喷金属熔滴流动和传热数值模型,模拟了7075铝合金熔滴成形过程中撞击速度、熔滴间距、基板温度和熔滴尺寸等工艺参数对成形形貌的影响规律,并对模拟结果进行了实验验证。结果表明:确定合理的撞击速度和熔滴间距是获得好成形精度和质量的关键,熔滴直径为100μm,间距为200μm的7075铝合金熔滴在初始温度为350 K的不锈钢基板上以1.5 m/s的初速度沉积成形时,可获得较好的成形效果。模拟结果与试验结果基本吻合,较好反映了实际成形过程中熔滴撞击、铺展和固化行为,为该工艺的实际应用提供了参考依据。
[Abstract]:By introducing VOF function and piecewise linear interface structure to construct free-form surface, a numerical model of droplet flow and heat transfer of micro-sprayed metal was established by using semi-implicit pressure correlation algorithm. The impact velocity of 7075 aluminum alloy droplet forming process was simulated. The influence of the process parameters, such as drop spacing, substrate temperature and droplet size, on the shape morphology was verified by experiments. The results show that it is the key to obtain good forming accuracy and quality to determine the reasonable impact velocity and droplet spacing. When 7075 aluminum alloy droplets with a diameter of 100 渭 m and a distance of 200 渭 m were deposited on the stainless steel substrate at the initial temperature of 350K at an initial velocity of 1.5 m / s, a good forming effect could be obtained. The simulation results are in good agreement with the experimental results, which reflect the droplet impact, spreading and solidification behavior in the actual forming process, which provides a reference for the practical application of the process.
【作者单位】：西安交通大学机械制造系统工程国家重点实验室;
【基金】：国家自然科学基金(31370944) 陕西省自然科学基金(2014JQ7238)
【分类号】：TH16

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