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Burnishing and densification of sintered gears

The Technology

The roller burnishing process is a gear finishing process that achieves comparable qualities to those obtained by shaving before heat treatment at very competitive costs.

Burnishing Process

  • Variable centre distance (T1). Tilting of the workpiece holder to ensure the workpiece is engaged with the tool.
  • Burnishing cycle = As many tool rotations as necessary. Free position of the workpiece. Driven by the tools.

Advantages and Characteristics

  • Better wear resistance
  • Improved surface finish
  • Less noisy
  • Very short cycle time (in the order of 10 sec)
  • Low cost option thanks to the the long life of both the tools and the parts produced

Densification process of sintered gears

This process uses the same principle as for roller burnishing

  • Variable centre distance (T1). Tilting of the workpiece holder to ensure that the workpiece is engaged with the tool.
  • Densification cycle = as many tool rotations as necessary. Free position of the workpiece. Driven by the tools

Advantages and Characteristics

The densification of the flanks on the gears allows:

  • Complex geometry to be achieved
  • Better mechanical characteristics and gear performance
  • Better surface finish

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