Doosan’s Lynx 220LSY series is a range of compact, high speed multi-tasking turning centres with Y axis.
Non-lifting turret and roller Type LM guideways provide high speed performance and superior accuracy, according to the company. EZ Guide i conversational programing makes the series quick and easy to set-up.
The bed is a single piece Meehanite casting with a heavy ribbing to prevent deformation and twisting. The guide ways are on a 30° angle to maintain a minimal and constant distance from tool tip to guide way, thus ensuring maximum rigidity and virtually no deformation under heavy loads. The slant angle also provides good chip flow as chips and coolant slide downward into the chip pan.
The linear guide ways are roller type for extra load capacity and rigidity. High precision linear motion guide ways are used on all axes to allow high rapid traverse rates. The X axis rapid traverse rate is 30 m/min (1,181 ipm) and the Z axis rapid traverse rate is 36 m/min (1,417 ipm). The Y axis increases the number of workpieces that can be machined complete without using expensive custom rotary tool holders. The Y axis enables the milling cutter to machine above or below centerline. A few of the operations possible with Y axis are drilling and tapping of off-centre cross holes, milling of flats, and rough and finishing of key-ways. Y axis travel is 105 mm (4.13 in.) (±52 mm or 2.065 in.), rapid traverse is 10 m (394 ipm).
The headstock casting is mounted on the same plane as the tailstock. The headstock is ribbed on the outside of the casting to increase the surface area for heat dissipation. The spindle is supported by a double row of angular ball bearings and cylindrical roller bearings in the front, and double row of cylindrical roller bearings in rear.
All spindle bearings are precision class P4 (AFBMA-B7) and are permanently grease-lubricated.
A high torque servo motor rotates the turret at high speeds and is a non-stop bi-directional, with a fast 0.11 second next station index time. Turret indexing is possible during rapid traverse movement away from the work piece. The non-lifting design eliminates the possibility of chips reaching the coupling.
The sub spindle enables the complete machining of parts in one setup. The full C axis design allows milling, drilling, and tapping on the back sides of parts. The sub spindle body is accurately positioned by a ball screw and servo motor. The spindle is supported by angular contact bearings in the front and cylindrical roller bearings in the rear. The sub spindles can be synchronized with the main spindle at speeds up to 4,500 rpm for “on the fly” part transfer. Parts can be automatically ejected into the standard parts catcher.