Vertical CNC Precision Grinding Center

KMT LIDKÖPPING VGG 4000

Machining diameter: 4,200 mm
Machining height: 550 mm

Diameter of magnetic chuck: 4,000 mm
Max. speed of rotary table: 13 min-1

Control system: SIEMENS SINUMERIK 840D PL

RIGHT GRINDING HEAD
Swiveling range, external: 50°
Swiveling range, internal: 47°
Max. grinding wheel diameter: 610 mm
Max. grinding wheel height: 255 mm
Max. workpiece height: 550 mm
Travel – X: 2,820 mm
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Travel – Z: 820 mm
Rapid traverse X + Z axes: 10,000 mm/min

LEFT GRINDING HEAD
Max. grinding wheel diameter: 610 mm
Max. grinding wheel height: 255 mm
Max. workpiece height: 540 mm
Travel – U: 2,870 mm
Travel – W: 790 mm
Rapid traverse U + W axes: 10,000 mm/min

GRINDING WHEEL MAGAZINE
Right magazine: Number: 5
Left magazine, number: 4

DIMENSIONS AND WEIGHTS
Machine weight: approx. 143,000 kg
Machine dimensions (L x W x H): approx. 13,400 x 8,945 x 4,250 mm

ACCESSORIES
- Automatic grinding wheel changer, left (4) & right (5)
- Automatic dressing unit for both grinding heads, MARPOSS P7
- Various grinding wheels and arbors
- Oil mist emulsion extraction system
- Automatic balancing device
- Hydrostatic guidance in all machining axes

DESCRIPTION
The machine is in exceptionally good condition and has only been used for the highly precise finishing of large bearings for offshore wind turbines. The machining process included grinding the inner and outer diameters, as well as the highly precise raceways of the rolling bearings. The machining results achieved demonstrate the machine's outstanding performance. Inner and outer diameters with a workpiece diameter of up to 4,000 mm were ground within a tolerance of ±20 µm. A profile accuracy of 2–3 µm was achieved for the raceways.

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