氣體輔助射出成型中氣體穿透現象之數值模擬分析研究

Numerical Simulation of Gas Penetration Phenomenon in a Gas-Assisted Injection Molding Process

莊英杰(Ying-Jie Juang)

指導教授 ： 趙修武

中原大學/工學院/機械工程研究所/碩士(2007年)

https://doi.org/10.6840/cycu200700697

摘要

本文建立在考慮氣體壓縮性下氣體輔助射出成型中氣體穿透現象之數值模型與應用該模型進行管狀成品之氣體輔助射出成行之模擬分析。若假設氣體特性依循理想氣體模式，模穴內的流場可由質量、動量及能量方程式加以描述，並利用波前方程式來追蹤塑料在管狀成品內波前的位置，而氣體壓縮性效應則藉由統御方程式的額外源項加以近似。本文的三維數值模擬是使用有限體積法離散統御方程式，並以流體體積法計算熔膠之波前分佈，同時使用熔膠狀態方程式和黏度方程式建立熔膠之流變特性。經由與現有實驗結果比較，驗證本文建立之三維可壓縮數值模型具有相當之精確性。

關鍵字

氣體壓縮性 ； 氣體穿透現象 ； 有限體積法 ； 流體體積法

並列摘要

The numerical prediction of three-dimensional melt filling and gas penetration in a clip-shaped square tube is conducted using a compressible model in this paper. The application of a finite volume discretization and volume-of-fluid method has been demonstrated to simulate three-dimensional gas-assisted injection molding processes. The modified Cross model and Tait Equation are implemented in the numerical scheme in order to describe the rheological properties of polymers. With the help of available experimental measurements, the numerical results of our three-dimensional compressible model are proven to have high prediction accuracy.

並列關鍵字

volume-of-fluid method ； gas penetration ； finite volume method ； compressible model

參考文獻

4.A.I. Isayev, “Injection and Compression Molding Fundamentals,” Marcel Dekker Inc., New York (1989).

10.S.W. Kim, and L.S. Turng, “Developments of three-dimensional computer-aided engineering simulation for injection moulding,” Modeling and Simulation in Materials Science and Engineering, vol. 12, pp. 151-173 (2004).

11.R.E. Khayat, A. Derdouri, and L.P. Hebert, “A three-dimensional boundary-element approach to gas-assisted injection molding,” Journal of Non-Newtonian Fluid Mechanics, vol. 57, pp. 253-270 (1995).

12.G.A.A.V. Haagh, H. Zuidema, F.N. Van De Vosse, G.W.M. Peters, and H.E.H. Meijer, “Towards a 3-D Finite Element Model for the Gas-Assisted Injection Moulding Process,” International Polymer Processing, vol. 3, pp. 207-215 (1997).

13.G.A.A.V. Haagh, G.W.M. Peters , F.N. Van De Vosse, and H.E.H. Meijer, “A 3-D finite element model for gas-assisted injection molding: Simulations and experiments,” Polymer Engineering and Science, vol. 41, no. 3, pp. 449-465 (2001).