hollowmandrel

A hollow mandrel is a cylindrical tool used in manufacturing processes, particularly in the creation of tubes and pipes. It serves as an internal support or core around which material is shaped, extruded, or formed. The hollow nature of the mandrel is a key characteristic, allowing for the passage of fluids or gases, or enabling the formation of a hollow core within the final product.

In tube extrusion, for example, a hollow mandrel is positioned within the die opening. As molten material is forced through the die, it flows around the mandrel, creating the hollow center of the tube. The precise diameter and surface finish of the mandrel directly influence the inner diameter and quality of the finished tube. Materials used for mandrels vary depending on the application, including hardened steel for durability and resistance to wear, or specialized alloys for high-temperature processes.

Hollow mandrels are essential for producing a wide range of tubular products, from metal pipes and plastic tubing to composite structures. Their design and application are critical for achieving specific dimensions, tolerances, and structural integrity in manufactured hollow components.