Rundprägung

Rundprägung, also known as radial forging or rotary forging, is a metal forming process used to reduce the cross-section of a workpiece while simultaneously increasing its length. This is achieved by a series of hammer-like tools that strike the workpiece radially and in a rotating manner. The tools typically consist of multiple dies that are arranged in a circular pattern. As the workpiece is fed through the dies, it is struck repeatedly from all sides. This action compresses and elongates the material, resulting in a more uniform and often stronger grain structure.

The process is particularly well-suited for producing long, slender parts with complex cross-sections, such as shafts, axles, and tools. Unlike traditional forging methods that may require multiple heating and shaping steps, Rundprägung can often achieve the desired shape in a single operation. The forces involved in radial forging are significant, and the process can be performed on a cold or hot workpiece, depending on the material properties and the desired outcome. Cold radial forging generally results in increased strength and hardness due to work hardening, while hot radial forging allows for greater deformation and the creation of more intricate shapes. The precision and efficiency of Rundprägung make it a valuable technique in various manufacturing industries, including automotive, aerospace, and general engineering.