When flat die thread rolling, the thread is made by two rotating rollers, using either a in-feed or through-feed process. This allows very long threads and parts without heads to be produced. Flat die thread rolling means that as well as classic threads, knurls, grooves, notches and special profiles are also economically feasible. We also use them for processing headless parts in both the in-feed and through-feed processes:
When using the in-feed process, the tool rollers driven at the same speed have the same direction of rotation. The workpiece rotates without moving axially. This method allows threads with high pitch accuracy to be produced.
In the through-feed process,the thread pitch is generated by tilting the roller axes by the pitch angle. The workpiece receives an axial thrust and moves a full rotation with the thread pitch in the axial direction. This method is especially recommended for overlong threads.