The Study of Flow on Gate Design in Thin-Shell Zn-Alloy Die Casting
| Autor: | Si-Rong Wang, 王思蓉 |
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| Rok vydání: | 2008 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 96 The main parameters of the mould included four variables relating to the gate system: gate size, position, shape, and cross-section. This study aimed to create multi-cavity die casting mould for thin shell zinc alloy parts of maximum 1.6mm thickness, and experiment designs and computer aided simulation to explore flow state of meta in the hot temperature and high pressure. In the different parameters, the flowing situation of the alloy melts in the mould cavities and verify the result using a hot-chamber die casting experiment. Analysis of the results shows that the primary goals of runner design include two things: (1) the flow path of melted metal was shortest; (2) mould cavity was easiest to fill with melted metal. Flow at the sides met obstructions and in some cases became thicker in the filling stage of the simulation. The simulated flow into the middle of the mould was found to be relatively slow but was faster on the two sides. The flow on both sides would gradually surround to the center so that trapped gas or gas porosity was produced. The main objective is to use result of computer aided simulation, and change runner shape and runner size to use analysis software to simulate the flowing condition of the air, which produced air trap. The melting metal motive force pushed air into the cold slug well in order to reduce the production of pores. Final paper is the runner best design to simulate analysis, and verify the result using experiment of die casting. Analysis of the results include three things: (1) the best smooth-going in the flow state, and the best less in the trapped gas, (2) reduce the production of gas porosity, (3) both with a nearly 95% accuracy. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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