Oxide removal processes and tools.

Most deburring machines are used for deburring and edge rounding ​​sheet metal parts. But with the appropriate machine tool combination, oxide byproducts can be removed from the edges as well. If sheets are cut using oxygen, an oxide layer forms along the cutting surface. There are several processes that are used to remove this layer. Blasting is still the best technical solution. However, we will outline some processes that do the job using suitable tools.

Oxide removal procedure along the cutting edge:

  • Disc brushes
  • Roller brushes
  • Oxide blocks
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Oxide removal with disc brushes.

Oxide removal with disc brushes.

Roller brushes that remove the oxide residues should be able to process along the cutting edges. The tools rotate and attack the parts sideways from the edge. Oxide removal is only possible, if the sheet metal has a certain thickness. In order to process thicker materials, a second pass with the part flipped over might be necessary if the machines only processes one side at a time.

In order to process the cut surface adequately, the brushes must work deep into the material. For a reliable process there must be free space under the part. This is the case with the EdgeRacer®, which has rotating disc brushes working both sides of the part.  This is possible thanks to specially designed discs with fine and long abrasive filaments.

Oxide removal with roller brushes.

Oxide removal with roller brushes.

Roller brushes equipped with wires are tools that remove oxide byproducts from sheet metal contours. The tips of the wire strike the outside layer on the cutting surfaces. The rotating roller brushes act on the sheet with the wire tips hitting the lateral sheet areas. The more flexible the rate with which the brushes hit the sheets - for example in a rotor - the more reliably are all sides freed of oxide residue.

Both spring steel and litz wire are common filament types. For example, when choosing the different varieties, the impact on the sheet metal surfaces produced by the rollers (as unwanted side effect) should be considered.

Oxide removal with blocks.

Oxide removal with blocks.

The operating principle of blocks with litz wire is similar to that of the roller brushes used in the oxide removal procedure. The tool blocks with wire filaments that are moved sideways by a belt chip off the oxide layer on the cutting surfaces.  Due to the linear movement, the impact is somewhat dependent on the passage direction. However, oxide removal blocks have the advantage of being able to process from top and bottom in one pass. This is always useful if the parts cannot be turned (or should not). Furthermore, the sheet thicknesses that can be processed is doubled. Double-sided processing saves significant processing costs.

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Additional information.

Contacts.

Andreas Hellriegel

Andreas Hellriegel
Head of Business Development
T: +49 7221 5009-78

andreas.hellriegel[at]arku.com

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