The new Sunnen SV-20 honing system is the first competitively priced large-part machine for job-shop part production with a true linear, vertical, servo-stroking system to produce precision bore geometries on compressor blocks, mud pump sleeves and similar oilfield components. Ideal for job shops and repair facilities, the SV-20 is equipped with a variable-speed 15-600 rpm, 4.1-kW (5.5 hp) spindle motor, powerful enough to drive two-stage, metal-bond, diamond abrasives for short cycle times with high accuracy and minimal labor. The SV-20’s 2.5 kW (3.4 hp) linear stroking system keeps the honing tool concentric with the bore throughout the full stroke length to produce a consistent diameter from top to bottom of the bore. The machine's work envelope of 915 mm x 1015 mm (36" x 40"), front-loading design, and weight capacity up to 680 kg (1500 lb) combine for versatility in processing a wide range of large parts. The SV-20 can be used to hone bores with inside diameters from 19-200 mm (0.75-8.00") requiring a stroke length up to 680 mm (26.8").
The PLC-controlled SV-20 utilizes a color touch screen, with a toggle switch to jog for fast setup. Advanced control features include a real-time display of the full bore profile that allows the operator to see taper and dwell the tool in that exact area for fast removal. The control can also automatically dwell the tool in the tightest areas of the bore, switch from roughing cycle to finish cycle automatically, or use size-lock to shut the machine off after a precise amount of stock removal. An automatic crosshatch calculator determines the correct stroke and spindle speed for a specific surface-finish angle. The swiveling operator panel can be adjusted for viewing from a variety of positions. A hand wheel on the machine allows left/right positioning of the column on its 838-mm (33”) X-axis. The machine comes standard with a 284-litre (75-gallon) internal coolant system equipped with two standard canister filters.
The SV-20’s rotary servo tool feed system can be used with two-stage hone heads to complete roughing and finishing without stone changes for faster processing times. The machine is compatible with all of Sunnen's past and current tooling for CK/CV/SV-series machines, including diamond abrasive hone heads and brushes, GHSS single-stage hone heads with CBN or diamond abrasives and brushes, and GHTS hone heads for two-stage honing with CBN or diamond abrasives.
The SV-20 is available with a 400V/50Hz/3Ph or 460V/60Hz/3Ph electrical system. Options include a T-slot base, manual rollover cradle for engine blocks, and sump pump to allow connection to an external coolant supply.
As seen in Modern Machine Shop.