What process is used to form a cone-shaped recess with sheet metal?

• A. Dimple countersinking
• B. Press dimpling
• C. Machine countersinking
• D. Coin dimpling

Answer: (B)

The process used to form a cone-shaped recess in sheet metal is press dimpling. This method involves using a press to exert force on the sheet metal in a localized area, which results in the metal being displaced to create a dimple. This dimple serves as a cone-shaped recess, which is essential in applications where a flush surface or a specific profile is needed for component assembly or structural integrity.

Press dimpling is commonly employed in aviation and other industries to enhance the performance and fit of riveted joints. It provides an efficient means of shaping metal without removing material, which is crucial for maintaining the strength and integrity of the structure. In contrast, the other options represent different methods for creating various shapes or recesses, but they are not specifically designed for forming the cone shape that press dimpling produces.