Machine presentation MIKROSA KRONOS S 250
Precision for small workpieces KRONOS S 250
KRONOS S 250 at a glance Overview Working range 1.5-35 mm, plunge cut length up to 245 mm GRANITAN machine bed with benefits such as thermal stability and vibration-reduction Cross-slide system for grinding and regulating wheel Grinding spindle with hybrid roller bearings, max. 150 m/s Reproducible grinding results even for tolerances of ±0,5 µm Designed for multiple production Full enclosure fulfills highest safety and environmental standards
KRONOS S 250 at a glance Available grinding technologies Plunge cut grinding - straight or 6 inclined Plunge cut grinding in single or multiple production Plunge cut grinding of multiple operations simultaneously or consecutively by offsetting the workpiece or the grinding wheel Oscillating plunge cut grinding Throughfeed grinding
KRONOS S 250 at a glance Typical applications Injector needles Nozzle bodies Valves Pump pistons Pistons with tapers Relay valves Rotor shafts Compressor crankshaft Cylinder roles Bolts Planet gears Transmission shafts Shifter shafts
KRONOS S 250 in detail Regulating wheel Regulating wheel: 250 x 250 x 127 mm Regulating wheel supported by roller bearings on both sides Spindle power 5 kw Maintenance-free life-time lubrication Short dressing time via regulating spindle speed of up to 1,000 min -1 Adjustment of regulation wheel angle by +5 /-5 Change device with integrated upper bearing housing Height adjustment of regulating wheel by +40-20 mm (optional)
KRONOS S 250 in detail Grinding wheel Grinding wheel: 450 x 250 x 203.2 mm Grinding spindle with maintenancefree hybrid roller bearings, max. 150 m/s Spindle power 15 kw Automatic balancing unit Quick conversion into a 6 angled plunge cut machine - Improved flexibility of application range - Grinding of diameter and faces in one operation
KRONOS S 250 in detail Slide system Cross-slide-system: 2 X-axes, 2 Z-axes Digital servodrives, use of high precision ball screws Slides on pre-clamped linear bearings Infeed increments of 0.1 µm for X1- and X4-axis Linear scales for X1- and X4-axis as standard Z2 Z3 X4 X1
KRONOS S 250 in detail Control system features SINUMERIK 840D (840D sl) and Simodrive drive technology Absolute drive concept Safety concept Safety Integrated Workpiece-orientated programming (WOP) for centerless grinding Standard cycles for - Plunge cut grinding - Throughfeed grinding - Dressing of grinding and regulating wheel Functions such as production parts counter, profile correction screen, feed calculations and compensation of dresser wear, error diagnosis incl. Windows help functions
KRONOS S 250 in detail Automation Standardized integrated automation Shuttle max. 2.0 m/s Interface to external automation Integrated gantry 2 CNC axes Tailored gripper systems Single or multiple grippers Workpiece changeover time: 3 sec
KRONOS S 250 in detail Dressing system High dressing accuracy due to dressing on the workpiece centre height Flexible dressing system: change from a rotary dresser to dressing blade or single point diamond Rotating dressing tools - Diamond contour roll - Diamond profile discs High-precision dressing with Acoustic Gap Control (optional)
KRONOS S 250 Technical data Description Grind ing rang e Grinding diameter, minimum mm 1.5 Grinding diameter, maximum mm 35 Plunge cut lenght, maximum mm 245 Grinding wheel Diamet er, maximum mm 450 Widt h, maximum mm 250 Bore mm 203.2 Regulating wheel Diamet er, maximum mm 250 Widt h, maximum mm 125 Bore mm 127 Grinding wheel drive Surface speed standard m/ s 80 Surface speed CBN, maximum m/s 120/150 Constant power rating kw 15 Regulating wheel drive Working speed range, infinitely variable min -1 5...500 Dressing speed min -1 1,000 Constant power rating kw 5.0 Dimensions of machine Foot Print of machine mm 5,700 x 4,000 Height mm 2,100 Weight kg approx. 8,000
KRONOS S 250 Technical data 4200 Description Grind ing range Grinding diameter, minimum mm 01. M ai Grinding diameter, maximum mm 35 Plunge cut lenght, maximum mm 245 Grinding wheel Diamet er, maximum mm 450 Width, maximum mm 250 Bore mm 203.2 Regulating wheel Diamet er, maximum mm 250 Width, maximum mm 125 Bore mm 127 Grinding wheel drive Surface speed standard m/ s 80 Surface speed CBN, maximum m/s 120/150 Constant power rating kw 15 Regulating wheel drive Working speed range, inf init ely variable min -1 5...500 Dressing speed min -1 1,0 0 0 Constant power rating kw 5 D imensions of machine Foot Print of machine mm 5,773 x 4,200 Height mm 2,100 Weight kg approx. 8,500 5773 1995 3213
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