具薄件LED散熱結構之模流分析

盧奕同

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具薄件LED散熱結構之模流分析

Mold Flow Simulation of Thin-Walled LED Heat Sinks

盧奕同 , Masters　　Advisor：周榮源　　

繁體中文

真空壓鑄；真空閥； LED散熱結構；數值方法； Vavuum die casting ； Vacuum shut-off valve ； LED heat sink ； Numerical simulation

Abstract │ Reference (12) │ Times Cited (1) │ Altmetrics

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

In this paper, the filling analyses of vacuum die-casting of a thin-walled LED heat sink structure and the vacuum valve structure are simulated by FLOW-3D software. Two topics are analyzed and discussed in this study. First, numerical simulations for variety of molding conditions, including different parameters of thermal conductivity, vacuum pumping pressure, mold temperature, filling velocity, respectively, are conducted for the computational model of a thin-walled LED heat sink with a vacuum shut-off valve. Second, effects of several geometrical parameters, including thickness of LED heat sink, vacuum valve dimensions of T2, D1, D2, L1, L2, W, respectively, of the computational model of a thin-walled LED heat sink with a vacuum shut-off valve are explored. In these two topics, melts are set to liquid metal of Al 384.0 materials. The first topic of analysis mainly to investigate the effects of molding parameters based upon the same computational model of a thin-walled LED heat sink with a vacuum valve. The simulated results show if molding conditions are changed, different sizes of defects are appeared in castings; if vacuum pumping pressure is higher, the casting is also firmness, density prone to increase; if vacuum pumping pressure is too low, then pumping efficiency of mold cavity is low and it will be easy to form the casting porosity defects. For the second topic of analysis, molding conditions are hold constantly, and effects of different geometrical dimensions to quality of castings are simulated. T2 trigger mechanism can effectively operate, but too thin or too thick, it will affect the pumping time to different degrees of vacuum. Decreasing of gas residuals of castings for the vacuum pumping pressures of 760Torr, 200Torr, 100Torr to 10Torr, were 0.311%, 0.174%, 0.008%, respectively. However, the value is only 0.008% for the case of 100Torr to 10Torr.

Reference ( 12 ) 〈TOP〉

[6] T.C. Tszeng, and Y. L. Chu, “A Study of Wave Formation in Shot Sleeve of a Die Casting Machine,” Journal of Engineering for Industry, Vol.116, pp.175-182, 1994.
連結：
[8] X.P. Niu , B.H. Hua, I. Pinwilla, and H. Lib, “Vacuum assisted high pressure die casting of aluminum alloys,” Journal of Materials Processing Technology, 105, 119-127 (2000).
連結：
[9] Chul Kyu Jin, and Chung Gil Kang, “Fabrication process analysis and experimental verification for aluminum bipolar plates in fuel cells by vacuum die-casting,” Journal of Power Sources, 196, pp.8241–8249, 2011.
連結：
[12] D.M. GAO, “A THREE-DIMENSIONAL HYBRID FINITE ELEMENT–VOLUME TRACKING MODEL FOR MOULD FILLING IN CASTING PROCESSES,”Int. J. Numer. Meth. Fluids, 29, 877-895 (1999).
連結：
[1] 陳金城，“真空壓鑄的發展，”特種鑄造及有色合金，第五期，pp. 32-33 (1996)。

Times Cited (1) 〈TOP〉

何承恩(2015)。一種門把手壓鑄模具之模流數值分析。義守大學機械與自動化工程學系學位論文。2015。1-67。

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