Research On High-power LED Radiator Heat Dissipation Performance Analysis And Cold Extrusion Forming Mold Structure Optimization

Due to the environmental protection and energy saving characteristics, LED lights hadtriggered a new revolution in the global lighting industry. While this fourth leap from thelighting in the history encountered some resistances, which is the LED heat problem, just likea dark cloud in the lighting industry. Especially in today’s highly integrated electronic chips,power density becomes stronger and stronger. So more strict requirements for the radiator areneeded, which can give a big favor to satisfied today’s cooling demands for chips. As a newprocess for forming the LED radiator, provide a new cooling solution for LED lights. And thusin the development of the radiator, it has a very important engineering and practicalsignificance for the research on thermal performance of radiator and cold extrusion formingprocess.In this paper, by comparing thermal performance difference between cold extrusionradiator and traditional craft manufacture radiator, it is concluded that under the condition ofthe same structure and power input, the cooling performance of cold extrusion radiator isbetter than radiators which are manufactured by pulling aluminum and casting aluminum. Andon the cold extrusion radiator, temperature distributes more uniform and maintains a low value;After the study of different placed conditions on the impact of cold extrusion honeycombradiator cooling performance, the result showes that along the three selected directions, theradiator placed vertically downward has the best cooling performance, which followed by isthe radiator placed vertically upward, and when the radiator placed horizontal, the coolingperformance is the worst. The "chimney effect" plays an important role on heat dissipationperformance; Choose fin radiators with different structural parameters to build orthogonalexperiment, and study the radiator’s thermal performance. It is found that five structuralparameters’ impact on the thermal performance of the order for: bottom thickness> radianradius> blade thickness> number of blades> center wall thickness. When it is extended to thefinned and honeycomb radiator, bottom thickness and fins or cellular height will be the mostimportant factors to affect thermal performance.In this paper, to construct a system of the cold extrusion forming mould, three kinds of high-power LED radiators of cold extrusion forming process are studied, The finite elementsimulation on the forming process of these three kinds of radiators has been carried, and theresults on force and stress-strain analyses about the main parts of the mould, can guide themold structure optimization. As to the fin plate and fin type radiator, it needs to design acertain slope on the die hole, the materials of punch and up mold needs to strengthen, theconcave mold should be designed for combination concave mold. Conducted twice moldstructure optimizing for complex honeycomb radiator cold extrusion mold, the result showsthat reasonable selection of fillet size can make the extrusion pressure greatly reduced. Afteroptimization filletsizes of upper and lower dies are0.5mm and0.25mm respectively; whichhelps forming force reduced to the700T from the beginning of the830T, and the reducedpercentage is15.66%.The heat dissipation of cold extrusion radiator LED lamp with has been measured, whichcan obtain the temperature rise curve during the actual working process of lighting up, and thetemperature drop curve in the process of shut off the power. Microstructure was observedbefore and after cold extrusion, the organization has undergone an obvious refinement,resulting in an increase of tensile properties. The surface hardness was measured before andafter forming, and the hardness value of aluminum radiator generally increased, there appearsthe phenomenon of cold hardening.