On grit, roughness value or non-directionally
Sheet grinding on Grit
In addition to the usual G240 or G320, there is a wide range of options for other grits, coarse or fine. A low grit indicates a coarsely ground surface, for instance G36 or G60. This is applied when gluing sheet metal or non-slip applications. With G400 or G600, the grit is much finer and this is often applied from an aesthetic point of view, for instance in interior design projects. Or to prepare it for polishing. A fine grit corresponds with a low roughness value, as long as the previous grinding steps were carried out correctly.
Grinding plates for polishing
Using a polished sheet means that your basic material is already maximally treated, which includes the corresponding costs. If it still requires much cutting, bending and welding, the perfect polish could go to waste. On the other hand, a completely untreated sheet is also not ideal, because this leaves a lot of manual polishing after assembly. Therefore, we developed a solution that meets both ends, especially ideal with thick, hot-rolled sheet metal. The mill scale is mechanically removed from the sheet and is completely flattened. Next, it is built up to a fine grit and low roughness value in stages. Here you assembly your product and then easily polish it. Or, you can outsource it to our safe and reliable hands.
Grinding sheets to Roughness value
If you are active in tank and appliance manufacturing for the food industry, or pharmaceutical industry, there is no escaping it: Roughness values such as Ra, Rz and Rt. The former, the Ra value, is most common. The intensity of the grinding is often determined by the material type. Sheets in the cold-rolled 2B-finish category usually have a low roughness value and only require a light grinding to reach the Ra value. Hot-rolled 1D are a lot rougher and require more intensive treatment to reach the required roughness values. Naturally, the material type is a decisive factor in the throughput time and price.
This finish is known under various names, such as Non-directional ground/brushed, Orbital ground, Vibes, Vibration ground, Excenter ground, Angel hair etc. In the end, we all mean the same, and the objective is a neat, sleek, homogeneous finish.
A non-directional finish, where the grinding tracks go in random direction. This is common in the kitchen industry as a finish on a kitchen counter or other design applications. A non-directional finish, combined with a nice colour can give a spectacular look, for instance in Façade projects. For more information, consult our Architecture page.
Cleaning & wrapping
It goes without saying that your product will leave our premises clean and completely wrapped in foil. For this purpose, Van Geenen has Cleaning baths, Ultrasonic baths and clean wrapping rooms at its disposal.
You can even take this a few steps further to clean products on a “high-tech level”. Van Geenen also has a cleanroom and the necessary certificates.
Grinding & Polishing
The use of stainless steel plate is an important component in metal construction. Large stainless steel tanks, machines and constructions largely consist of polished stainless steel plate.
It is essential that the correct stainless steel plate is selected and that the plate must be ground.
We are happy to discuss the visual and technical requirements (Ra / Rz value) with you and advise to what extent your sheet metal work needs to be processed.
With the extensive machinery, Van Geenen has all the possibilities in-house.
A solution to any finish
Our range of Machines