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EXTERNAL GRINDING

External grinding is a machining process with geometrically undefined, multi-edged tools. We normally perform the external grinding task as a complementary process to a surface we have internally processed. BAHMÜLLER has established the special feature of using CBN materials for highly efficient process design when grinding to finished dimensions.

SPECIAL FEATURES OF BAHMÜLLER EXTERNAL GRINDING TECHNOLOGY:

General


  • directly driven frequency spindles with integrated dynamic balance systems
  • cutting speed of 45 – 150 m/s
  • CBN technology for ultrafine grinding tasks (match grinding and seal seat grinding of injection industry components)
  • use of purely ceramic bonded diamond grinding wheels
  • directly driven frequency spindles with hydraulic expanding clamping elements for dressing
  • use of diamond shaping and diamond profile rollers
  • burr-free grinding through the simultaneous use of 2 independent tools (offset 180 degrees)
  • grinding wheel diameters of up to 600 mm
  • use of grinding wheel base bodies made of carbon fiber reinforced plastic (CFK)
  • roundness and straightness <= 0.1 μm
  • surface qualities Rz (incl. CBN) <=0.5 μm
  • cylinder shaping <=0.3 μm
  • match play tolerance for length and diameter <= +/- 0.5 µm

Between centers


  • adaptive cylinder error correction during the grinding process with piezo tailstock, use of two independent diameter measurement heads for process control
  • cylinder error correction with piezo tailstock over post-process measurement
  • multi-match grinding of up to 2 diameters and 2 lengths in one clamping
  • use of project-specific diaphragm carriers without transverse force

Chuck parts


  • with force activated clamping chucks (hydraulic, pneumatic)
  • prismatic grinding device for higher concentricity requirements
  • work piece clamping in roller assembly for deflection-critical parts with unfavorable length/diameter ratio
  • adaptive cylinder error monitoring with AE sensor equipment (sonographic gate recognition)
  • hydrostatic work piece spindle for concentricity accuracies under 0.1 µm
  • small CBN grinding tools (80 – 120mm) for highly precise grinding tasks in compact machines
  • rotating dressing process optionally on work piece spindle (speeds up to 6,000 rpm)

YOUR BENEFITS

  • project-specific tool development in connection with our process development in the tech center
  • through CBN technology, reduction of required machines possible through process integration of pre-grinding and finish-grinding (match quality)
  • optimal process reliability and stability
  • defined burr-free and sharp-edged geometries (for better product properties)
  • maximum availability through optimal tool service life > 12 months (CBN)
  • highest output through optimized machining times and minimal auxiliary times/maximum dressing intervals (CBN)

WE ARE LOOKING FORWARD FOR YOUR CALL


Our head office will be glad to advise you.

phone +49-(0)7181-809-0
fax +49-(0)7181-809-234
e-Mail info@bahmueller.de


You will find your personal contact on the different departments under the rubric service.

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