Uprated mill-turn speeds

Brother, the Japanese manufacturer of very high speed machining centres, has introduced an uprated version of its Speedio M140X1 5-axis, 30-taper mill-turn centre.

Called Speedio M140X2, the machine was launched at Jimtof 2016 last November and is available in the UK and Ireland through sole agent, Whitehouse Machine Tools.

Improvements include an integrated, high output, direct drive motor in the C-axis to replace the previous roller drive powering the 2,000rpm turning table. The A-axis trunnion rotates through a 50% larger angle, from +120° to -30°, allowing machining of features at the rear of components and facilitating loading and unloading of parts at the front of the machine.

Furthermore, the A-axis is now tilted by a backlash-free roller drive, promoting high accuracy metalcutting. A holding force of 400Nm without the need for a mechanical clamping mechanism delivers high speed indexing combined with rigidity when milling parts at an angle or turning them in the horizontal plane.

A new option is a 16,000rpm BIG Plus face-and-taper contact spindle, which can be specified in place of the standard 10,000rpm spindle. XYZ travels of 200mm, 440mm, 305mm remain the same, but the distance between the table surface and the spindle nose has been increased to 455mm, providing more space for the fixture, workpiece and cutting tool and hence extending versatility of production.

Brother has removed every conceivable element of non-productive time. For example, not only are speeds fast during non-cutting motions, but they also take place simultaneously in X, Y, Z, A and C, together with tool change. The spindle motor's rapid acceleration/deceleration and a highly responsive servo control enable a 0.2 seconds start/stop time. Start-up time of the turning table from zero to 2,000rpm is less than 0.3 seconds.

The specification of the Speedio M140X2 includes 0.9 seconds tool change from the 22-position magazine, giving 1.4 seconds chip-to-chip time. Rapids of 50m/minute in the linear axes help to minimise non-cutting times further, while 30m/minute cutting feed rate maximises metal removal rate. Synchronised tapping is impressive at 377m/minute peripheral tap speed.

Accessibility for workpiece transfer is ergonomic and the generous door opening can be automated for high production environments or to automate load/unload. Swarf management measures are comprehensive, as befits a machine that is likely to handle large volumes of aluminium chips. A new, high speed C-00 control system completes the package.

A video of the machine demo-cutting an aluminium component from a solid billet may be viewed at:


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