There are many kinds of heat sinks for LED lights, and the commonly used types are:
Die-cast aluminum heat sink, extruded aluminum heat sink (that is, aluminum profile heat sink), stamped aluminum heat sink, plastic-clad aluminum heat sink, and high thermal conductivity plastic heat sink. Each type of heat sink has its own characteristics and characteristics, which will be introduced one by one below.
1. Heat sink of die-cast aluminum
Die-cast aluminum heat sinks are generally larger in size, with more special-shaped designs, and controllable production costs. The heat dissipation wing cannot be made very thin, and it is difficult to maximize the heat dissipation area. The commonly used die-casting materials for LED lamp heat sinks are ADC10 and ADC12.
2. Extruded aluminum heat sink
Extruded aluminum heat sink (aluminum profile heat sink) is to extrude liquid aluminum through a fixed mold, and then cut the bar into a heat sink of the required shape by machining, and the post-processing cost is relatively high. The heat-dissipating wings can be made very thin, and the heat-dissipating area is expanded to the maximum. The heat sink automatically forms air convection to dissipate heat during work, and the heat dissipation effect is better. Commonly used materials are AL6061 and AL6063.
3. Stamped aluminum heat sink
The stamped aluminum heat sink (usually cold forging) is used to punch and pull up copper and aluminum alloy plates through a punch and die to make it a cup-shaped heat sink. The inner and outer periphery of the stamped heat sink is smooth, and the heat dissipation area is limited due to the lack of fins. Commonly used aluminum alloy materials are 5052, 6061, and 6063. The quality of stamping parts is small and the material utilization rate is high, which is a low-cost solution. The heat conduction of aluminum alloy heat sink is ideal. It is more suitable for isolated switching constant current power supplies. For non-isolated switch constant current power supplies, it is necessary to isolate AC and DC, high-voltage and low-voltage power supplies through the structural design of the lamp in order to pass CE or UL certification. The aluminum alloy heat sink meets this requirement.
4. Plastic-clad aluminum heat sink
Plastic-clad aluminum heat sink is a heat-conducting plastic shell aluminum core heat sink. The thermal conductive plastic and the aluminum heat sink are formed on the injection molding machine at one time, and the aluminum heat sink is used as an embedded part, which needs to be mechanically processed in advance. The heat of the LED lamp bead is quickly transferred to the thermally conductive plastic through the aluminum heat dissipation core. Thermally conductive plastic uses its multi-wings to form air convection to dissipate heat, and uses its surface to radiate part of the heat.
Plastic-packaged aluminum heat sinks generally use the original colors of thermally conductive plastics, white and black. The black plastic plastic-clad aluminum heat sink has a better radiation heat dissipation effect. Thermally conductive plastic is a thermoplastic material. The fluidity, density, toughness, and strength of the material are easy to be injection molded, have good resistance to cold and heat shock cycles, and have excellent insulation properties. The thermal radiation coefficient of thermally conductive plastic is better than that of ordinary metal materials. The density of thermally conductive plastic is 40% lower than that of die-cast aluminum and ceramics. The weight of the plastic-clad aluminum can be reduced by nearly 1/3 with the same shape of the heat sink. Compared with all-aluminum heat sinks, the processing cost is low, the processing cycle is short, and the processing temperature is low; The finished product is not fragile; Customer-supplied injection molding machine can design and produce differentiated shapes of lamps. The plastic-clad aluminum heat sink has good insulation performance and is easy to pass security inspections.
