Show you the common heat sink manufacturing process

1. Stamping: copper plate or aluminum plate can be pressed into the required shape. It is usually used in traditional air-cooled electronic equipment to provide low-cost heat dissipation for low calorific value devices. Due to the use of advanced die and high-speed stamping technology, the heat sink formed by stamping is very suitable for mass production. In the factory, the thread, clamp and interface material can be processed for the heat sink manufacturing process according to the specific use, which can greatly reduce the labor cost of later circuit board assembly.

2. Profile (extrusion): this kind of heat sink can be used in the occasion of transferring a lot of heat. The profile with specific cross-section shape can be formed by extrusion, and the subsequent processing, such as cutting, machining and so on, can be carried out. Rectangular pin fin heat sinks, and increasing serrated fins (omni directional, rectangular pin fin heat sinks, and increasing serrated fins) can be formed in the whole direction by cross cutting, which can improve the heat dissipation efficiency by 10% to 20%, but the profile with this cross section will reduce the extrusion speed. There are also some limitations in the way of extrusion molding, such as the ratio of fin height to fin spacing, and the thickness of fin, which limit the selection range of design parameters, The minimum fin thickness is 1.3 mm. With special die design, the ratio of fin height to fin spacing can be up to 10, and the fin thickness can be reduced to 0.8 mm. However, increasing the ratio of fin height to fin spacing will increase the tolerance

3. Welding / assembling fins: most of the air-cooled fins are limited by the convection environment, and the increase of fins will bring significant improvement to the overall heat dissipation performance of the fins. This kind of high-performance fins uses thermal conductive aluminum filled with epoxy resin to bond the fins to the substrate with positioning slots, The ratio of fin height to fin spacing can be increased to 20 ~ 40, which greatly improves the ability of heat transfer to air in limited space

4. Casting: using sand mold, investment casting and die casting, the heat sink manufacturing process of aluminum, copper or bronze can be processed in vacuum or under normal conditions. This technology is usually used to process fins with high density fins or pin fins, which can provide the best heat transfer performance in high-speed airflow.

5. Bent fin: aluminum or copper plate can increase the area contacting with air in the same space by sheet metal process. This kind of fin can be fixed on the substrate or the surface to be cooled by epoxy resin or welding. Due to the small thickness of the plate, there is a large thermal resistance along the plate direction, Therefore, this process is not suitable for making large volume heat sink. However, it can be used to make high-performance heat sink through post assembly or other processes