Maintaining device junction temperatures below their maximum threshold is critical for reliability, performance, and longevity. Research shows that a 10ºC reduction in junction temperature can double the lifespan of a device while improving operational stability.
Among all cooling methods, air cooling with heatsinks remains the most cost-effective and widely used solution. Heatsinks enhance heat spreading and maximize surface area, allowing better heat dissipation through airflow.
When selecting the right heatsink for your application, designers typically evaluate:
Die casting involves pouring molten metal into a high-precision mold to create complex, unique shapes. Manufacturers often use this method to mass-produce intricate three-dimensional structures in a single step, typically without the need for post-treatment.
Forging is a deformation process in which the work is compressed between two dies, using either impact or gradual pressure to form the part. It is the oldest of the metal-forming operations, dating back to perhaps 5000 BCE. Cold Forging is the technique of deforming metals into a desired shape by localized compressed force at room temperature. Fin arrays are formed by forcing raw material into a modeling die by a punch. This process increased the impact and shear strength and improved the gain structure, reducibility and reliability of the final product.
Extrusion is the technique of pressing a heated billet through a die of the desired cross-section profile. It is similar to squeezing toothpaste out of a toothpaste tube. This process is very good for its low tooling cost and high production output.
Manufacturers create folded fins using a progressive stamping method. They then bond the fins to a base using thermally conductive epoxy or metal welding. This process allows for combining aluminum and copper to customize heat sink performance for various applications.
Skived fins are made by a knife tool that shaves fins up from an extruded aluminum or copper block. This predecessor can create an externally high fin-to-gap aspect ratio, which increases the surface area and drastically improves the thermal performance in forced airflow environments.
Stacked fins (also known as zipper fins or snapped fins) are assembled out of individual pieces of metal sheets, forming a dense interlocked fin array soldered to a copper or aluminum base. It allows a wide range of shapes and very long fin blades.
CNC machines are electro-mechanical devices that use computers to control machine tools. CNC stands for Computer Numerical Control and it represents one of the two common methods (3d printing and fused filament fabrication) to generate prototypes. Unlike 3D printing, CNC machines remove material from a block of plastic or metal.
Injection molding is a process in which a polymer is heated to a highly plastic state and forced to flow under high pressure into a mold cavity, where it solidifies. The molded part called a molding, is then removed from the cavity. The process produces discrete components that are almost always in a net shape. The production cycle time is typically in the range of 10 to 30 seconds, although cycles of 1 minute or longer are not uncommon for large parts.
Friction stir welding (FSW) is a solid-state joining process that uses a non-consumable tool to join two facing workpieces without melting the material. The process derives its name from this stirring or mixing action. The rotating tool is stepped, consisting of a cylindrical shoulder and a smaller probe projecting beneath it. The RPM of the string head is usually between 600 to 1,800 RPM, and different string heads will be used for different welding materials.
