The first electrically insulator layer has a pin and the second electrically insulator layer has a hole formed to receive the pin. The fin is designed to control and limit the flow of fin material to the top of the fin to avoid cracking the fin during the cold forming process. This is done by making the lower end of the pin resistant to flow and allowing the upper end of the pin to flow. The lower end of the pin has a larger cross-sectional area than the upper end so that the lower end is resistant to flow and the upper end is flowable.
展开▼
