本文選題：微噴熔滴沉積成形 + 鋁合金��； 參考：《稀有金屬材料與工程》2017年05期

【摘要】：采用半隱式壓力關(guān)聯(lián)算法,通過引進(jìn)VOF函數(shù)和分段線性界面結(jié)構(gòu)(PLIC)構(gòu)建自由曲面,建立了微噴金屬熔滴流動和傳熱數(shù)值模型,模擬了7075鋁合金熔滴成形過程中撞擊速度、熔滴間距、基板溫度和熔滴尺寸等工藝參數(shù)對成形形貌的影響規(guī)律,并對模擬結(jié)果進(jìn)行了實(shí)驗(yàn)驗(yàn)證。結(jié)果表明:確定合理的撞擊速度和熔滴間距是獲得好成形精度和質(zhì)量的關(guān)鍵,熔滴直徑為100μm,間距為200μm的7075鋁合金熔滴在初始溫度為350 K的不銹鋼基板上以1.5 m/s的初速度沉積成形時(shí),可獲得較好的成形效果。模擬結(jié)果與試驗(yàn)結(jié)果基本吻合,較好反映了實(shí)際成形過程中熔滴撞擊、鋪展和固化行為,為該工藝的實(shí)際應(yīng)用提供了參考依據(jù)。
[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.
【作者單位】： 西安交通大學(xué)機(jī)械制造系統(tǒng)工程國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金(31370944) 陜西省自然科學(xué)基金(2014JQ7238)
【分類號】：TH16

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