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.
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)
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)
