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Theoretical and Experimental Study on the Filling Process of Injection Molding Micro-Channels

Author: WuZhiMing
Tutor: WuDaMing
School: Beijing University of Chemical Technology
Course: Mechanical Design and Theory
Keywords: Micro injection molding Microheater Microfluidic channel Aspect ratio Mold flow analysis Process parameters
CLC: TQ320.662
Type: Master's thesis
Year: 2011
Downloads: 83
Quote: 0
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Abstract


Recent years micro rise of nanotechnology research and the rapid development of MEMS technology, the microscale under the heat exchanger research more and more important by the majority of scholars, the miniaturized heat exchanger technology concern. Micro channel heat exchanger as the miniaturization of the heat exchanger is an important development direction, has a broad application prospects. The polymer micro injection molding technology for the complex shape of the micro-structure, micro-size bulk copy possible, along with the development of new materials, is bound to have great prospects for development in the field of micro-molding. Designed a polymer composite and metallic aluminum micro channel heat exchanger by the numerical simulation to verify its excellent heat transfer effect, with high feasibility. Injection mold flow analysis through the design of a number of micro-flow channel model to study the design and process parameters of injection molding runner injection molding products filling performance and warpage. Focus on different dimensions, fin aspect ratio, draft angle, gate size and gate distribution patterns of fin warpage investigated. Using the the CAE simulation auxiliary microfluidic channel micro heat exchanger mold design optimization of the mold sprues, runners, and cooling channels opened conducted. To study metal polymer composite decline of heat exchanger forming process simulation contrast injection molding effect of the presence of embedded aluminum microheater. Micro channel heat exchanger design target parts, combined with CAE analysis results, the use of the two points of a mold, micro injection mold structure diagram single point into the casting gating system design and manufacturing. Micro CNC milling and other processing equipment for the the stack mold core block and inlaid aluminum manufacture. The experimental study of micro-injection molding process, the micro-channel heat exchanger based on orthogonal experimental design method. The experimental data analysis of process conditions on the the microheater molding quality, density, warp experiment indicators, and to get the best combination of process parameters of the micro-channel heat exchanger. By numerical simulation and experimental studies have shown that polymer metal composite decline of the heat exchanger has a good heat transfer capability, you can achieve the cooling needs of electronic products. The gate location no obvious effect on the micro heat warpage, increase micro-slot size and aspect ratio of the amount of warping increase significantly. The gate and the sprue size mold design greatly affect the filling effect, have a greater impact on products volume contraction. Embedded aluminum can improve the volume shrinkage and reduce overall warpage.

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > General issues > Production process and production technology > Forming > Injection molding
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