Monday, 15 July 2013
12 CNC axes for profitable series production
The OKUMA LT3000 EX CNC lathe, with 3 turrets, up to 48 driven tools and 3 Y-axes, is recommended for the complete machining of complex workpieces in medium to large batch sizes. Okuma promises the following customer benefits: excellent process stability, precision machining with premium quality, short cycle times, lower unit costs and a generally enticing total cost of ownership.
The OKUMA LT3000 EX integrates two equivalent main spindles and up to 12 axes for complex lathing up to a diameter of 350 mm. As with all OKUMA machines, the drives, control and the absolute position transducer were designed in-house. As a result, all the electrical and electronic components, as well as the numerous software features, are perfectly matched to one another and to the machine design. The main spindle drives provide 22 (optionally 30) kW, accelerate the workpiece chuck to 5000 rpm and generate a maximum torque of 427 Nm. The acceleration from 0 to the maximum speed – including the chuck – takes 4.4 seconds, while deceleration takes only 3.2 seconds; this not only keeps downtimes at a minimum, but also makes it possible to change the range of the two speed stages within 0.5 seconds at full speed. The PREX drives of the three tool turrets accelerate rotary and milling machines at 7.1 kW to a maximum of 6000 rpm within 0.3 seconds; the peak torque of 40.4 Nm promises a good low-end output, while the indexing time of 0.2 seconds from station to station guarantees short downtimes. If the lower turret is equipped with dual receptacles, users can add another 16 tools. As an option, the three turrets can be supplied with one Y-axis each; the traverse path measures a uniform 125 mm.
A true innovation is OKUMA's own thermal compensation – Thermo-Friendly Concept (TFC). TFC automatically compensates for the influence of ambient temperature variations on the machining result; in combination with the extremely reliable and precisely executed premium engineering, this explains the very high dimensional stability.
OKUMA offers various automation modules for the LT3000 EX. These include a manual or automatic swiveling tool measurement device, a servo-controlled pick-up device for damage-free removal of sensitive finished parts and rod residues, and even an integrated portal with a magazine for cut-offs or preformed blanks.
In terms of the control system, users enjoy the convenience of the latest OKUMA generation, the OSP-P300L, with a 15" touch screen. The CNC uses an Intel i7 processor and Windows as a second independent operating system. The control system offers energy-saving shutdown functions. The optional Collision Avoidance System (CAS) supports users as early as during setup and programming using dynamic real contour tracking of the workpieces. Even gross operating errors have no consequences when CAS is used. When setting up CAS, the new OKUMA CNC provides support using convenient modeling capabilities for the chucks, jaws, tools and workpieces. By consistently using CAS, operators can dramatically reduce the break-in time of new programs; crashes are nearly impossible.
A further innovation is OKUMA's own Machining Navi L-g. This optional feature provides not only higher productivity, but also improved surfaces and extends the tool service life.