A selection of cross sections can be


seen in Fig. 9. The two principles can be combined with each other to a certain degree.


Fig. 9: Component cross-sections. The way that a thread pressing stage


Fig. 6: Thread forming for hollow components.


In contrast to forming solid components


(as in Fig. 1), no pre-forming is required here. But some combinations in pre- forming are helpful for various reasons.


works for a solid component is shown in Figure 10. A sleeve is used and it carries the thread cutting jaws. In order to clamp the jaws, the sleeve with the jaws is moved along an external guide. As the sleeve, which carries the component, is moved too, a fixed stop is provided to restrict any elongation on the component.


Fig. 7: Blank variations for pressing hollow components.


As the process of producing threads


on hollow components is particularly challenging, outstanding cost reductions can be achieved by using these processes. Many hollow components are still machined nowadays because of the thread. The ability to form threads in a press


not only offers a cheaper production method, but the complete component can now be ‘pressed’ – and this means that less materials are required and much higher output levels are possible. As the processes are vastly different


from rolling, the normal restrictions are completely irrelevant. As a result of being able to restrict the components’ elongation, a three-axis state of tension is created and this allows the operator to forge materials that are hard to form. It is not essential for the material to


be clamped along its complete length. Figure 8 shows two options for the same application.


Fig. 10: Stages in forming a thread. These applications can be used in


a wide variety of ways. Here are some examples, which we recommend as particularly suitable for this process:


• One area is free on the press in order to form the thread.


• Top-heavy parts.


• Multiple features are required (flanges or knurls etc).


• The thread/profile must start immediately below the head or shoulder.


• The part has thin walls and is hollow.


• The starting point of the thread has to be deliberately specified.


• The thread can serve multiple functions by its shape and design: conical, polygon, sharp and modified pitch.


• Round thread crests are required without any rolling marks.


• The relief notches are used to clean out the mating thread.


Fig. 8: Examples of hollow components.


• The relief notches at the end are used to vent air or drain oil and other media.


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