Grinder offers centerless and between-center grinding.

Press Release Summary:

Kronos L dual features 2-in-1 setup where workpiece is first ground between centers at material removal rate of 0.05-0.10 mm/min on dia. Workpiece is then released, and finish grinding takes place via centerless grinding between control wheel and workrest blade. Double-end supported grinding wheel spindle permits surface speeds up to 120 m/sec, and double-end supported regulating wheel spindle delivers up to 700 rpm. Granitan machine base provides vibration dampening and thermal stability.

Original Press Release:

Kronos L Dual - Two Processes, One Machine

MAMISBURG, OH - United Grinding Technologies, Inc. (UGT) announces the introduction of a new addition to its Studer Mikrosa BWF Kronos Series of high-performance centerless grinders, the Kronos L dual.

The Kronos L 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 operatioas. 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 L 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-l" 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-l 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 L dual is an extended, dual process version of the Kronos L 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 L 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 (TM) 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.

The Kronos L dual is supported by an expert team of grinding specialists drawing on more than 14,000 centerless grinding machine installations and support and service centers in more than 50 countries.

United Grinding Technologies Inc., the North American arm of the Korber-Schleifring Group and supplier of such venerable nameplates as Blohm, Ewag, Jung, Magerle, Studer, Studer Mikrosa, Studer Schaudt, and Walter is a global leader in grinding technology and has built a reputation for industry-leading innovation and unparalleled service and support.

For more information, contact United Grinding Technologies, Inc.; 510 Earl Blvd., Miamisburg, OH, 45342. Tel: 937/847-1222. Fax: 937/859-1115.

Bill Houze
United Grinding Technologies
Robin Bergstrom

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