Studer Mikrosa Kronos Dual Centerless / between Centers Grinder
Kronos Dual
Kronos L dual
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The KRONOS Dual is absolutely new! It provides a series of processing
benefits thanks to the combination of centreless grinding and grinding
between centres.
The
technological highlight of the KRONOS Dual is the retention of the workpiece centre in centreless grinding. As the workpiece centre is
not lost, nothing is left up to chance any more. Its field of
application is to be seen whenever previous or successive work steps
require processing from the centres. The KRONOS Dual guarantees
shorter processing times by higher stock removal performance, with
the combination of grinding between centres and centreless grinding.
An economical solution has been found by the machine concept on the
tried and tested basis of the KRONOS Dual with all its benefits and
features. With the KRONOS Dual innovative development of grinding
between centres is achievable.
Features:
Due to the
combination of 2 grinding methods, the workpiece center will remain
intact
Considerably
shorter processing times with high precision in comparison with
grinding between centres only, as the workpiece is fully supported
and therefore cannot bend.
Reduced material
handling times
Rigid granitan
machine bed ensures excellent thermal stability characteristics and
superior vibration absorption
SIEMENS Sinumerik
840 D control and Simodrive infeed technology
Double-end
supported grinding wheel and regulating wheel spindle with
anti-friction bearings
A maximum power of
133 hp allows for powerful chip-removal
Semi-automatic
grinding wheel changing enables reduction of the grinding wheel
changing time to less than 15 minutes
Motorized coolant
jet adjustment in accordance with the grinding wheel wear
Specifications:
Workpiece
Diameter
Length, max.
0.6...4"
12...24.8"
Grinding wheel
D x W x d, max
26" x 26" x 12"
Peripheral
speed, max
208/396 ft/sec
Spindle drive
80/133 hp
Regulatingwheel
D x W x d,
max
Peripheral
speed, max
16" x 26" x 8"
5...700 rpm
Dressing
speed, max
Workcenter support
700 rpm
4 MT
Kronos Dual - Two Processes, One Machine
The Kronos Dual offers an innovative design which permits the combination of two
processes - centerless grinding and grinding between centers
in a single machine, in a single setup. The results are shorter cycle times, greater
through-put and improved part quality due to reduced component handling and the
elimination of multiple setups and operations. A reduction in cycle time of 45% is not unusual
due to the higher material removal rates of the combined processes compared to grinding between
centers alone, which is often limited by between-center grinding workpiece support systems.
The Kronos Dual offers an ideal solution for high-volume production of medium- to
large-sized precision shaft-type components - workpieces with a common center which becomes the
basis for preceding and/or following process operations - such as crankshafts, camshafts, gear
shafts and rotor shafts for electric motors.
The dual process
In the combined "2-in-1" process, the workhead and tailstock are installed between the grinding
and regulating wheels immediately next to the fixed workrest blade. The workhead is equipped
with a fully programmable workpiece driver. The work spindle is axially positioned via a CNC
spindle drive. Tailstock support is controlled by a hydraulically activated sleeve, and
workhead and tailstock are easily adjusted to appropriate workpiece length and diameter.
In operation, the workpiece is first ground between centers concentric to the center, at a
material removal rate of 0.05 mm/min to 0.10 mm/min on diameter. After grinding between
centers, the workpiece is released, and finish grinding takes place via conventional centerless
grinding between the control wheel and workrest blade. This 2-in-1 single setup provides
outstanding workpiece stability, resulting in precise part-to-part process repeatability,
close tolerances and superior surface finishes.
The Kronos family
The Kronos Dual is an extended, dual process version of the Kronos Dual and incorporates the
latest in grinding technology, specifically aimed at dramatically reducing non-productive
processing time.
The modular machine concept, which provides application-specific machine configuration
flexibility, features a rigid Granitan machine base, which guarantees superior vibration
dampening and thermal stability. A double-end supported grinding wheel spindle permits
surface speeds up to 120 m/sec, and a double-end supported regulating wheel spindle
delivers up to 700 RPM for shorter dressing times.
A fixed location grinding gap allows for fast cycle times and simple workpiece handling,
since no additional compensation axis is required. Semi-automatic, fast grinding wheel
change facilitates small-batch manufacturing.
The Kronos Dual dual features state-of-the-art Siemens digital control and axis drive components.
Machine operation, setup, changeover, dressing and programming of even complex parts are easily
accomplished through the innovative step-by-step Mikrosa Symbol Screen Technology.
The Siemens Sinumerik 840D control package features application-specific software routines,
Windows user-interface, integrated on-line help menus and extensive fault/error
diagnostics. Remote diagnostics, process control and trouble-shooting via standard telephone
line and machine modem link are easily facilitated.
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