The zipper fin is a metal sheet that is stamped step by step. First, use the punch to create the geometry of the fins. Length, height, and fins pitch are determined in the first set of punches. The fins' thickness is determined by the thickness of the fins used. In the process of secondary punching, the fin is folded up and locked together with the previous fin. When the fin stack has enough fins for the application of the stack, it will be removed from the punching area and ready to become a complete zipper fin heatsink.
Zipper Fin heat sinks are an ideal air-cooled solution for high-powered forced convection applications for mass production. A zipper fin stack is constructed from a series of individual sheet metal fins that are stamped, folded, and zipped together using interlocking features. Fin lengths and gaps within a stack can vary by using different stamping dies and fins can be closed, creating a finned duct with the zipper fin stack, or open for multi-direction air flow depending upon application airflow requirements.
Zipper Fin manufacturing process
1. Zipper fin is a process commonly used in the processing of thin fin.
2. Zipper fin is used for the processing process of combining the single thin fin formed by stamping AL1050&CU1100 into a dense parallel fin.
3. Another purpose of the use of a zippered fin is to compensate for the interface impedance resulting from the subsequent connection (usually brazed) between the fin and the heat-absorbing bottom. The connection area between the thin parallel sheet fin and the heat-absorbing base is small, and considering the actual connection rate and interface impedance of the connection surface, the heat transfer between the heat-absorbing base and the fin may become the bottleneck in the entire heat conduction path of the heat sink. Therefore, the blade folding process will leave a folding edge on the side where the fin will be connected with the heat-absorbing bottom. After bending the lock, the blade will be combined into a relatively flat surface, that is, each fin will have a "wider" bottom, and the site will become an "L" shape.
Zipper fin heat sink materials
The zipper fin heat sink material can be copper base and aluminum fins, or copper fin and aluminum base. Depending on the application requirements, zipper fin heat sink material may need an all-aluminum or all-copper. The material determines the joining between the fin and the base. Aluminum resists soldering, so the aluminum/aluminum joints are epoxy bonded. Epoxy does not adhere well to copper, so copper/copper joints are easy to weld. If mixed the two, the aluminum components are usually nickel-plated and then the assembly is soldered together.