Like grinding, the finishing process (super-finishing) is a machining process with geometrically undefined cutting edge, but with significantly reduced work piece and tool rotation and speeds.

Our super-finishing process is a cross-hatch process which can handle very precise, flat, convex or concave/spherical work piece geometries.

The tool, rotating at a circumferential speed of 1 to 20 m/s, is pressed with defined pressure on the work piece, which is also rotating. Moving or tilting the tool axis creates arc-shaped lines that overlap. In this case, all abrasive grits that are engaged produce the radially intersecting processing lines, the cross-hatch, by overlapping of the individual arcs.

Bonded abrasives in pot or sleeve design and segment grinding heads with an average grain diameter of between 15 and 70 μm are used.

The superfinish process, normally the last machining process in a processing chain, substantially improves the surface structure and geometry of components.

Pre-processing of work pieces by rotating and grinding creates a relatively rough surface which, under certain circumstances, can still have thermal damage in the structure. The short-stroke movements of the grains during superfinish processing removes the peaks of this roughened structure and increases the contact ratio.

Your Benefits

  • high process reliability through dressable diamond finish tools
  • long tool service life, as with self-sharpening tools
  • high degree of machine availability through fewer tool changes
  • higher accuracies through process integration in the grinding machine (avoidance of reclamping errors between grinding and finishing machine)
  • cost reduction through elimination of in-process control

Special features of BAHMÜLLER finish technology:

  • grain size < 16 μm
  • dressable ceramic bonded diamond tools
  • cutting speed 8 m/sec
  • tool dia up to max. 200 mm
  • achievable surface qualities Rz < / =0.2 μm
  • flatness < / 0.5 μm
  • length dimension tolerance +/- 1.5 µm (no in-process control required)
  • adaptive process control through gate recognition sensor equipment