Sunnen's SVL-2115 Lapping Machine Improves Worker Safety
EMO 2019: Sunnen’s SVL-2115 multi-stage automated lapping machine laps and air gages a bore in one setup, freeing operator time and increasing part consistency.
Sunnen’s SVL-2115 multi-stage automated lapping machine laps and air gages a bore in one setup, freeing operator time and increasing part consistency. The product is designed for aerospace part manufacturers looking for a cost-saving solution for bores with large length-to-diameter ratios and tight tolerance requirements, such as hydraulic sleeves, valves and piston pumps. The system control is designed for unattended operation; gage readings are fed back to the control and the cycle is repeated until the parts are within specifications and tolerance.
Sunnen lapping tools are available for workpiece diameters ranging from 6.3 to 45 mm (0.25" to 1.77") and lengths up to 12 times the bore diameter, with a maximum of 200 mm (7.87"). Spindle speed range is 100 to 2,000 rpm during lapping, but it is capable of slow speeds for non-powered steps, such as lapping paste application or slow-rotation bore entry. Stroking speed ranges from 0 to 350 strokes per minute, with stroke length optimized to achieve a high degree of bore cylindricity.
Due to the ergonomics of the machine, repetitive motion injuries often encountered with manual lapping have been eliminated, according to the company. There is no need to touch a moving part during the lapping process, and a light curtain improves safety.
Easy tooling and probe changeovers accommodate multiple different parts runs during a shift. A stack light allows operators to monitor cycle completions or faults from a distance
In vertical grinding, the workpiece is held upright in a rotary chuck with the grinding spindle overhead. This configuration can improve roundness, facilitate single-setup processing and prolong the life of the machine. Loading and unloading may gets easier, too. Workpieces with relatively large diameters and short lengths benefit the most from vertical grinding.
Because of the high material removal rate creep-feed grinding can deliver in challenging materials, grinding might not be just the last step in the process—it might be the process.
Two enabling technologies -- superabrasive wheels and high precision servo control -- come together to provide a contour grinding process that resembles an OD turning operation. For many medium volume OD grinding applications, this method may be a means to consolidate several manufacturing steps into a single setup.