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KELLENBERGER Kel-Varia UR225-1500 1-2-6-7

Grinding diameter: 450 mm
Grinding length: 1,500 mm
Centre height: 225 mm
Control: FAGOR

EQUIPMENT:
- T1: 500 mm grinding wheel diameter
- T2: 400 mm grinding wheel diameter
- T6: Internal grinding attachment
- T7: Internal grinding attachment
- Spindle motor, water-cooled, 9.8 kW
- Marposs tool measuring system
- Active longitudinal positioning
- Kel-Set
- GAP sensor (contactless by ELASO) at T1 and T2, integrated in the control interface
- GAP at T3/T4 via fluid sensor
- Semi-automatic balancing by ELASO for T1/T2, integrated into the control interface
- Tailstock hydraulic, with fine adjustment +/-150 μm
- Dressing device on the lower table, workpiece spindle side
- Dressing device on the lower table, tailstock side
- Dressing device on the upper table
- New, service-friendly and operator-friendly enclosure

SPECIAL EQUIPMENT:
Workpiece spindle headstock with direct drive
*Strongly recommended for non-circular grinding
*Workpiece weight (chucked): max. 75 kg
*Workpiece weight (between centres): 150 kg
*Water-cooled
*MK5 combined with short taper mounting DIN 55026
*Oriented spindle stop
*Fixed lower part
B-axis with direct drive, centre height 225 mm
*Extremely torsion-resistant
*High positioning accuracy
*Resolution: °
*Water-cooled

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MECHANICAL RETROFIT:
- Complete overhaul according to Kellenberger measuring protocol
- Newly painted

Hydraulics unit new:
- Improved temperature control (oil cooler)
- Energy saving: only one pump, not running continuously
- Pressure monitoring
- Monitoring of water content in hydrostatic oil
(Early detection of bellows damage)

Hydrostatic leadscrew in X:
- Wear-free due to no contact during operation
- No loss of accuracy, even under continuous full load at max. speed
- Frictionless at low speeds
- No stick-slip effect at low speeds
- Precisely transmits even the smallest rotational movements
- No backlash in case of change in rotational direction
- No fluctuation in friction torque due to ball circulation
- Higher axial rigidity than ball screws
- Significantly better damping, leading to improved surface finish and tool life
- No vibrations from ball return
- Suitable for high speeds and accelerations
- Cost-effective alternative to linear motor, higher accuracy, significantly lower heat generation
- Significantly lower power loss and no issues with chips sticking to permanent magnets
- Much lower cooling capacity needed compared to linear motors

ELECTRICAL RETROFIT:
- New, modern CNC CYLINDRICAL GRINDING MACHINE controller with BEMA grinding interface
- Completely new electrical cabinet
- New drive technology
- Replacement of all wiring, pressure switches, etc.
- New absolute glass scales on X and Z axes
- New absolute rotary encoder (for B-axis)

CONTROL SYSTEM:
The grinding software consists of a base license and various options available depending on the machine's configuration.

Software base:
- External and internal oscillation grinding
- External and internal plunge grinding
- External and internal face oscillation grinding
- External and internal face plunge grinding
- External and internal taper oscillation grinding
- External and internal radius grinding (radius dressed on wheel)
- Semi-automatic oscillation grinding
- Workpiece...

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