In addition to electric cars, many improvements in emissions protection are also still being implemented in cars with internal combustion engines. Leakage pumps play an important role in this. Complex small components, consisting of a plastic-graphite mix, make an important contribution to the longevity of the pumps.
SGL Carbon supplies commutator discs of pure electro graphite, produced at temperatures of approx. 3000 °C, as well as hard carbon discs filled with graphite components and produced at a temperature of approx. 1000 °C.
The carbon graphite family of materials is well suited for the production of high-precision discs. These special graphites represent a tremendous combination of carbon's outstanding material properties and the potential for cost-efficient large-scale serial production. These results can be achieved thanks to the pressed-to-size (PTS) manufacturing process.
The discs are pressed on fully automated high-frequency presses to achieve the desired final contour and shape. Standard fire shrinkage is then the only significant factor in determining the geometric alignment of the press tool when working with this material. SGL Carbon works solely with high consistency materials and precision press feeds to ensure that we can deliver the promised tolerances. Little to no post-production machining is then required.
Another benefit of the PTS process: extensive freedom in geometric design. As with injection molding and die-cutting, this process also allows for offsets, fluting and profiling on the top surfaces of the discs without expensive and time intensive post-production machining. A broad range of design options are available, so long as they adhere to the basic rules of materials and processing technology.
Please don't hesitate to contact us for help in developing or optimizing your concepts and geometries.
They are self-lubricating, highly resistant to heat and corrosion, and can handle heavy compressive stresses. Our SIGRAFINE® graphite products are ideal components in vane-type pumps, fuel and water pumps, commutators, bearings and exhaust gas recirculation.
Reap the benefits of the extraordinary material properties and quality of our products for the type of applications found in automotive manufacturing.