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Doosan Machine Tools America introduced a series of large capacity, ram-type vertical turning centers. The series is comprised of the PUMA VTR1216 and the PUMA VTR1216M, which is equipped with an additional spindle for milling, providing convenient, efficient mill-turn capabilities on one machine tool platform. Both machines offer a number of productivity enhancing features. The one-piece bed with dual chip convyers greatly improves chip handling and reduces downtime for manual chip removal. Up to four tools can be mounted in quad holders that can be integrated into the tool magazines with capacities available from 12 to 34 stations, increasing the number of total tools for automatic selection and reducing the tool change time while improving productivity.
Main table speeds of 60 hp - 400 rpm and live spindle speeds of 20 hp - 3,000 RPM (VTR1216M) offer the power and speeds needed to fully take advantage of today’s cutting tool technology.
According to Boob Baldizzi, technical sales specialist for Doosan’s large machines, “The system provides 90 degree indexing on turning tools, making it possible to mount four different turning tools on each holder. The result is significantly reduced average tool change times and increased tool capacity for resulting in shorter cycle times and fewer set-ups between operations.”
One of the main benefits of the single, wide column design is that it provides full X-axis travel distances, allowing machining and probing on both sides of the workpiece and a 1,200 mmm (47.2 in.) Z-axis travel. Both machines in the series provide a cutting capacity of 1,700 mm (67 in.) in diameter and 1,250 mm (49.2 in.) in height. The cutting envelope is 125 percent larger than its predecessor.
Both models are built to offer heavy roughing and accurate finishing. Tithe VTR 12166 and VTR 1216M are designed and built with long service life in mind with 17,600 lbs. (8,0000 kgf) load capacity main tables, cross roller bearings, a curve coupling tool holder interface providing 17,600 lbs. (8,000 kgf) of tool clamping force, a dual opinion C-axis (VTR12166M), and rigid construction design and materials.
Related Glossary Terms
- centers
centers
Cone-shaped pins that support a workpiece by one or two ends during machining. The centers fit into holes drilled in the workpiece ends. Centers that turn with the workpiece are called “live” centers; those that do not are called “dead” centers.
- gang cutting ( milling)
gang cutting ( milling)
Machining with several cutters mounted on a single arbor, generally for simultaneous cutting.
- milling
milling
Machining operation in which metal or other material is removed by applying power to a rotating cutter. In vertical milling, the cutting tool is mounted vertically on the spindle. In horizontal milling, the cutting tool is mounted horizontally, either directly on the spindle or on an arbor. Horizontal milling is further broken down into conventional milling, where the cutter rotates opposite the direction of feed, or “up” into the workpiece; and climb milling, where the cutter rotates in the direction of feed, or “down” into the workpiece. Milling operations include plane or surface milling, endmilling, facemilling, angle milling, form milling and profiling.
- turning
turning
Workpiece is held in a chuck, mounted on a face plate or secured between centers and rotated while a cutting tool, normally a single-point tool, is fed into it along its periphery or across its end or face. Takes the form of straight turning (cutting along the periphery of the workpiece); taper turning (creating a taper); step turning (turning different-size diameters on the same work); chamfering (beveling an edge or shoulder); facing (cutting on an end); turning threads (usually external but can be internal); roughing (high-volume metal removal); and finishing (final light cuts). Performed on lathes, turning centers, chucking machines, automatic screw machines and similar machines.
