Answer questions

What is burnishing?

Perhaps you have already heard of "diamond copying" or "CNC diamond polishing" - these are different terms for the same refinement. With the help of a diamond cutting insert in a high-precision CNC lathe, the surface of the aluminum rim is turned - to put it more simply: cut off.

What sounds simple, in practice requires a lot of specialist knowledge in addition to expensive machines such as a laser measuring system and the ones just mentioned
diamond cutting tools. However, this refinement can be carried out on all aluminum wheels.

Through the process, the rainbow-like shimmer of the aluminum becomes visible again, the surface is finely ground to mirror quality. You should definitely consider this refinement as part of a repair, since the edge damage (up to a certain depth) will be removed anyway. In order to keep the reflective shine for a long time, the freshly machined rim is sealed with a clear coat specially developed for this purpose.

How does the powder coating process work?

Powder coating or powder painting is a coating process in which a conductive material is covered with electrostatically charged powder paint. The first step in coating consists of surface pretreatment, i.e. cleaning of the part to be coated, preferably with the help of ultrasound, and/or the application of a conversion layer. This is followed by intermediate drying and the actual coating process in a coating chamber. Finally, the material or the rim is transported to the oven for polymerisation. The workpieces are transported semi-automatically through a conveyor system in our future-oriented company.

In this process, the electrostatically charged paint powder is applied to the workpieces made of electrically conductive metals such as steel or aluminum using a spray gun, and it therefore adheres better than is the case in a direct comparison with the wet paint process. This prevents any dripping, running and/or streaking of the paint. The parts are then transported into the oven via the rail system. By heating to 150-200°C, the powder melts and combines to form a durable, even and very impact-resistant surface.

The powder coating of metal parts also offers other clear advantages over wet painting: it is quicker to use, more economical and more environmentally friendly. The range of applications is also much broader than is often assumed. An equally decisive advantage is that the proportion of color in powder coatings is 100% and is therefore significantly higher than the proportion in wet paints, which can vary between 30 and 60% depending on the type or type of paint.

On top of that, the powder coatings that can be used do not contain any environmentally harmful solvents or even heavy metal components, as is often the case with wet coating processes, since the polymerization in the oven does not produce any critical substances that could damage the environment. A collector, separator or thermal post-combustion are also not required. However, the process is not only advantageous from an ecological point of view.

Another advantage is that the parts intended for powder coating do not have to meet any special requirements. There is also almost no restriction on part size. It is even possible to coat very large workpieces. Another economic and ecological advantage is powder recovery. The powder that is not applied to the workpiece is transported to the processing station and from there it is returned to the cycle. Thus, this specialized process can be considered as future-oriented, sustainable and ecological.