Preparation Of Heat Dissipation Surface Microstructure By Injection Compression Molding

The existence of surface microstructure could enhanced the heat transfer performance and improve the system power consumption, polymer material can achieve the proper forming method preparation of surface heat function structure, and since the advantages of higher heat transfer coefficient rompted the polymer materials get enough attention and development in the field of heat strengthening; Injection compression molding is a kind of high precision and high stability of the molding process, and has the specific advantages compare to conventional injection molding.In this topic, in addition to calculate the theoretical effect of the microstructure on heat dissipation, also studied the surface microstructure of molding, using orthogonal experiment preparation with heat dissipation surface with v-shaped ribs microstructure, study the forming result affect by molding process parameters, and geometry size of microstructures microstructure.The v-shaped ribs microstructure unit was selected as research object, and analysis temperature distribution on the surface of microstructure side under the free convection environment by establishing the mathematical model, the research results show that heat release is affect by the lateral surface microstructure of the vertex Angle, rib width and base level and fluid temperature difference. To guarantee the existence of the v-shaped ribs microstructure can play good strengthening effect on the heat transfer ability, microstructure geometric size set range should be:vertex Angle 0<?<25°, rib base width 0.2mm<w<0.6mm, and w=0.5mm, the vertex Angle ?=30° of molding surface microstructure were studied.For the molding of surface microstructure, through the orthogonal experiment, the two kinds of different material, six of the injection compression molding process parameters on the effect of surface microstructure forming height was studied. The results show that the main process parameters affecting the polypropylene surface microstructure is mold temperature, delay time and the compression distance. For the polycarbonate parts, the molding was mainly affected by the compression speed and compression-distance. Using the same orthogonal experimental to study the molding of different size of surface microstructure, at a distance runner are:15 mm,32 mm,49 mm and 65 mm of four locations, the main factors influenced the height of two kind of microstructure forming is the same, were mold temperature, compression speed and compression distance and delay time.Through the contrast experiment of heat dissipation, the angle smaller and the higher of heat dissipation v-shapes microstructure forming on the surface of the elevation, the heat capacity better. Compared with flat, V rib microstructure with apex angle 15° can increase the cooling speed by 26.07%, and V rib microstructure with apex angle 30° can increase the cooling speed by 12.89%.