What is the primary function of flanging dies?

The primary function of flanging dies is to form a bend or flange in a metal sheet without causing distortion to the material. When working with metals, it is essential to maintain the integrity of the structure while achieving the desired shapes and angles. Flanging dies are specifically designed to apply controlled pressure to the metal, allowing it to bend smoothly along a predetermined path. This process retains the material's original properties and ensures the dimensions of the bend are accurate, which is critical in aviation applications where precision and strength are paramount.

The other options do not align with the purpose of flanging dies. Creating holes in metal sheets is typically achieved using punch dies or drilling tools. Cutting metal sheets into specific shapes involves cutting dies designed for shearing or profiling, rather than forming. Enhancing the aesthetic appeal of structures may occur through various finishing processes, but it is not a primary function of flanging dies, which focus strictly on shaping the metal effectively.