Press Release Summary:
With center height of 175 mm, Studer S31 universal cylindrical grinder offers between-centers grinding length of 650 mm or 1,000 mm, wheel size of 500 x 63 x 203 mm, and chuck capacity between centers of 130 kg. Dual wheelhead arrangement presents 2 external grinding wheels for rough and finish grinding in same setup, while alternate configuration is left/right with internal grinding for universal applications which allows OD, face and ID grinding in one setup.
Original Press Release:
S31 Offers Large Capacity, Proven Precision & Flexibility
MIAMISBURG, OH - United Grinding Technologies, Inc. (UGT) announces the introduction of a new addition to its Studer line of high-performance universal cylindrical grinders, the S31.
Modular design for quick setup and changeover, state-of-the-art digital control and drive systems and user-friendly step-by-step programming make the S31 a remarkably flexible solution to a wide variety of internal and external cylindrical grinding applications. Center height is 175 mm. Between-centers grinding length is 650 mm or 1000 mm. Wheel size: 500 mm x 63 mm x 203 mm. Chuck capacity between centers is 130 kg.
A dual wheelhead arrangement presents two external grinding wheels for rough and finish grinding in the same setup. The two wheels are diagonally positioned and have independent, programmable spindle drive systems to fully optimize the grinding process. Another wheelhead configuration is left/right with internal grinding for universal applications which allows OD, face and ID grinding in one setup.
The universal turret wheelhead with optional B-axis (fine adjustment to 0.0001°) swivels automatically, permitting external, internal and face grinding of workpieces in a single setup. A serrated 1° resolution Hirth ring coupling automatically maintains orientation from -15° to +195°, thus providing extreme accuracy and repeatability for grinding even the smallest tapered angles. An optional C-axis permits ultra-precise form grinding routines for tooling (punches, for example) and thread grinding.
Digital direct-drive, three-phase servo motors with 40-mm diameter prestressed, precision ballscrews power the X- and Z-axes. Cross slide X-axis travel is 254 mm at speeds ranging to 5000 mm/min. Linear resolution is 0.0001 mm. Distance between V and flat guideways is 280 mm. Z-axis slide travel is 800 mm or 1,150 mm. Speed and linear resolution are respectively 10,000 mm/min and 0.0001 mm. Z-axis distance between V and flat guideways is 200 mm.
V and flat guideways are coated with abrasion-proof Granitan S200 and provide high vibration dampening and superior rigidity. Patented guideway design prevents hydrodynamic effects found in conventional guideways and results in high load-bearing over the entire machine speed range.
The machine base of Studer-developed Granitan S103 delivers outstanding vibration dampening, rigidity and strength, as well as excellent chemical stability and thermal compensation.
Grinding spindles are powered by two 7.5 kW motor and have high-precision roller bearings for precise, high-resistance, maintenance-free operation. Peripheral speed up to 50 m/sec with continuous speed control to 3200 RPM. Workpiece spindle, with high-precision roller bearings, handles grinding between dead centers as well as live grinding with revolving spindle. Precision control permits fine adjustment of cylindricity during grinding operations to +/- 40 /mi.
Guaranteed tolerance precision: 0.0004 mm on roundness and 0.0025 mm/0.003 mm straightness deviation over a length of 650 mm or 1000 mm.
Wheel dressing intervals may be made by the operator following these simple methods: by pressing a pushbutton at any time during any grinding cycle; after a programmed number of specific machined parts or grinding operations; at programmed switchover points; at the programmed nominal size; after a specific number of strokes - or a combination of these, permitting the optimum solution for the specific grinding application.
Grinding wheel reference points are referred to as "T" numbers, and together with Studer grinding cycles, "T" numbers permit programming with nominal size. The actual value indication on the control LCD refers in each case to the programmed wheel reference point. Values of the grinding wheel shape are entered in a dressing dialog display at the control.
Control & programming
The S31 features state-of-the-art Fanuc 16i digital control and axis drive components - or optional Fanuc 21i, a more cost-effective solution for less demanding applications. Machine operation, setup, changeover, dressing and programming of even complex parts are easily accomplished through the innovative, step-by-step Studer Pictogramming which allows operators simply to connect grinding cycles to one another and add necessary numerical values. The control then generates the machine program automatically. Advanced manual programming in G code is of course also possible. Programming is done directly at the machine or off-line and then downloaded to the machine control. Process parameters can be changed on the fly, while the machine runs, without affecting the workpiece program.
The S31 control package features proven application-specific Studer grinding cycles for diameters, shoulders (left and right), tapers (negative and positive), contours, forms and threads.
For the S31 Studer offers a loading system based on the portal loading principle with V-grips. The system is suitable for irregularly shaped workpieces measuring up to 300 mm in length and 35 mm in diameter, and, thus, covers a large proportion of the parts produced on the machine.
Parts are fed into the system via the basic module that is located on the outside of the machine, either on a standardized adjustable V-block conveyor or pallets. The enclosure for the basic module has been designed to fit snugly round the machine and allows the operator to work safely and unhindered. Regardless of workpiece size or equipment, changeover times of under seven seconds are typical.
Studer universal, external and internal grinders are supported by an expert team of grinding specialists and technicians drawing on more than 10,000 machine installations and a worldwide support and service network.
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 and Studer Schaudt, 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. www.grinding.com.