Managing processes thanks to skiving

More than a century ago, Wilhelm von Pittler applied for the patent for skiving gears. In 1910, this was a revolutionary idea. Yet this process has actually only been in full use since machining centers and universal machines with linked and synchronized spindles and process-optimized software made it possible to apply this highly complex technology. The Paul Horn GmbH, the precision tool manufacturer from Tübingen, Germany, offers a wide range of tools for skiving of different tooth geometries.

The system includes tools for highly efficient production of inside serrations, pitch serrations and other inside profiles, as well as for outside serrations with interference fits. The main advantages of skiving in these applications are the markedly shorter process times compared to tooth punching, the use of optimized turning/milling centers, turning and toothing in a single fixture, and the elimination of free-stitching at the tooth end.
Moreover, these tools guarantee production that is more efficient and economical than roller punching and reaming, and a cycle time four to five times shorter than slot punching. 

The skiving tools are intended for tinning medium to large series. Here, each tool is individually adapted to the application and the material to be machined, with the interfaces matched to the number of teeth and the size of the module.

Especially for internal gearing, Horn ensures short production times for larger modules with these solutions. Skiving of such modules requires large and robust milling and turning machines, which enable the required synchronization between workpiece and tool spindle. The larger the module, the stronger the role of rigidity. With the distribution of the cut between the left and right sides of the tool, this can be accommodated. Horn used the experience it gained with small carbide skiving tools to provide a solution for larger modules as well. 

Horn's skiving tools are specifically tailored and built for each application. Each application is checked for technical feasibility by technicians before execution, and tool design and process recommendations are discussed with the user.

The range includes tools in cylindrical or taper form for modules from 0.5 to 2. The solid carbide monobloc version is available with a diameter of up to 20 mm and with a slim design. They are used for machining small modules and parts, especially in those applications where a slim shank is required due to the danger of collision. Cutting materials and coatings tailored to the application ensure a high-quality finish at the workpiece. 

For parts larger than 20 mm, skiving tools with interchangeable heads are used. Thanks to the precise interface, the cutting head can easily be changed in the machine without removing the holder. This carbide holder guarantees high rigidity, wear resistance and precision. For the larger modules, Horn in turn deploys a toolholder with changeable cutting plates. Especially for the WSR tools, Horn can place the internal coolant supply in front or behind the cutting edge. This means that, depending on the application, blind, continuous or stepped holes can be machined with the appropriate cooling.