Heat sink material is the basis of performance, design is the essence of the product, and ultimately whether to achieve excellent design ideas, or how to achieve the results, what kind of products customers can finally get, all depend on the use of heat sink manufacturing technology. There is a close relationship between the forming and bonding process of heat sink, and some of the technologies can be used in both processes.The most common and cost-effective technologies include extrusion, forging, casting and stamping. Other advanced technologies include CNC machining, skiving, bonding, folding, stacking, welding, and swaging. Although these manufacturing technologies are expensive, they can make heatsink with features that cannot be done by other way. Lori have many manufaturing process heat sink, like machined heat sink, extruded heat sink, skived heat sink, zipper fin heat sink, die casting heat sink , stamping heat sink ,forged heat sink, etc.
The famous aluminum extrusion heat sink manufacturing is adopted by the majority of aluminum alloy heat sinks, which is the real mainstream in the market. Aluminum extrusion is the most commonly used process for processing aluminum material, which has been used in various fields. In the aspect of heat sink processing, aluminum extrusion process is mainly used to manufacture sheet fin or cylindrical fin of the initial blank.The material used in the aluminum extrusion process is usually AL6061 or AL6063.
Skiving heat sink manufacturing technogy is a unique metal forming process, most widely used copper heat sink integrated forming process. "Precision Skiving" is not known from where, just from the name of the hard to imagine the actual processing technology, but with the name Skiving, it is easy to understand. Skiving, skive,means to slice. Processing method: according to the needs of a whole piece of metal profile. Using a special planer with precise control, thin slices of specified thickness are cut and then bent upward into an upright state to become heat dissipation fins.
Cold forging is a highly precise heat sink manufacturing process that can produce round pin and elliptical pin heat sink. Aluminum, copper, or bronze heat sinks can be machined in vacuum or under normal conditions using sand, investment casting, and die casting.This technique is often used to fabricate fins with high density fins or pinfins that provide the best heat transfer performance in high-speed airflow. Thanks to the high pressure and low temperature, the forged heat sink has very good microstructure integrity.
Casting heat sink manufacturing technology is the aluminum ingots are heated from the solid state to the liquid state through the mold and then cooled to form the heat sink we want. Especially die casting, can make heat sink with complex geometries. But the material that can be casted has lower thermal conductivity than those employed in extrusion and forging.
Stamping heat sink manufacturing is typically used in making heatsink that require heat pipe running through the fins. Copper or aluminum can be pressed into the desired shape. Conventional air-cooled electronic devices are often used to provide a cheap way to dissipate heat from low-calorific 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 our factory, threads, clips and interface materials can be machined on the fin for specific use, which can reduce the labor cost of later circuit board assembly.
The sheet metal process allows aluminum or copper to increase the area of contact with air in the same space.The folded fins can be fixed with epoxy resin or welded onto the substrate or surface that needs cooling. Due to the small thickness of the plate, there is a large thermal resistance along the plate, so this process is not suitable for making large heat sink. However, it can be used to make high performance heat sinks through post-assembly or other heat sink manufacturing processes.
Most of the air-cooled fins have the limitation of convection environment, and the increase of fins will significantly improve the overall heat dissipation performance of the fins.The high-performance fins are bonded to a substrate with a slot in it by epoxy resin filled with heat-transfer aluminum. Through this heat sink manufacturing process, the ratio of fin height and spacing can be increased to 20~40, which greatly improves the ability of heat sink to transfer heat to air in a limited space.
CNC maching is a versatile heat sink manufacturing technology that can produce heat sinks with the most geometric complexity, or parts that require urgent delivery, but the high cost is often a disadvantage.