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頁籤選單縮合
題名 | 砂心吹製實驗之模擬驗證=The Sand Core Blowing of Simulation and Verification |
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作者姓名(中文) | 陳智頌; 許富淵; | 書刊名 | 鑄造工程學刊 |
卷期 | 41:1=164 2015.03[民104.03] |
頁次 | 頁17-26 |
分類號 | 472.2 |
關鍵詞 | 砂心; 砂心吹製; 顆粒流; 砂顆粒堆積; 數值模擬; 驗證實驗; 金屬鑄造; Sand core; Sand core blowing; Granular fluid; Sand particle deposition; Numerical modeling; Metal casting; |
語文 | 中文(Chinese) |
中文摘要 | 在重力式砂模鑄造過程中砂心的品質好壞會直接影響鑄件成品的幾何外型的完整性。並且砂心的生產方式主要依據樹酯硬化方式分為熱硬性固化、冷硬性固化以及氣硬性固化。三種固化方式所生產的砂心首要的步驟都是先將砂/空氣混合流體吹入模穴進行充填的動作,最後才進行砂心固化(或定型curing process)的動作。為了提高砂心的品質必須先瞭解砂心吹製過程中砂/空氣混合流體在流道內的堆積現象。這些在模具內的堆積現象(sandaccumulation procedures)往往不易由肉眼直接觀察模具內部的堆積現象。所以本研究針對不易觀察的堆積現象應用計算流體力學(Computational Fluid Dynamics,CFD)軟體數值模擬進行顆粒流體於模穴堆積情形的類比模擬,並且應用實際實驗來驗證模擬的準確性。由模擬以及實驗互相比較的結果發現模擬的累積質量和實際實驗相近,所以本研究中所使用的模擬參數由實際實驗結果所驗證。在砂心吹製實驗中發現,兩種粒徑噴射後,砂顆粒累積總質量(accumulated mass)與噴射壓力差(ΔP)成正比關係。而且,小顆粒(指平均粒徑219μm)會有堵住噴射管的現象,不管噴射管徑(shooting tube diameters)之大小,累積質量皆有一極限且固定的相同值。噴射管徑增大時,使其堵住所需的臨界壓力差會相對下降的現象;管徑大小與臨界噴射壓力差成指數反比關係。而大顆粒(指平均粒徑485μm)於本實驗條件中尚未有堵住現象,未發現有臨界壓力差的情況。 |
英文摘要 | In gravity casting process, the quality of the sand core has a great influence on the casting geometry. Sand core is mainly produced by resin bonded sands cured by thermo-setting, gas-setting and chemical curing agent. In all three curing methods, the first step is to blow sand into molds. Therefore, the accumulation condition in the mold during the blowing process has great effect on the quality of sand core. It is important to understand the blowing condition and the flow phenomena of air/sand mixture (called granular fluid) during the process. As fabricating sand cores, accumulation phenomena of granular fluid cannot be directly observed from outside of the mold. Therefore, in this study, the numerical software of Computational Fluid Dynamics (CFD) is employed to model the granular fluid in the sand core blowing process. In this study, the parameters used in the modeling are validated and confirmed by the experimental result. In the sand core blowing experiment, the accumulated mass of sand particles after shooting is proportional to the shooting pressures (ΔP) for two sizes of sand particles. The plugging condition during particles traveling through the tested tubes is discovered in the small particle size ( i.e., mean size of 219μm). As a result, the accumulated mass is only proportional until a critical shooting pressure in this small size. Also, this critical shoot pressure decreases with increasing the tube diameters. A reversed exponential relationship between the critical shooting pressure and the tube diameter is found. For the big size (i.e., mean size of 485μm), plugging condition was not observed. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。