Machining centre minimises non-cutting time

The new Daewoo ACE HP5000 twin-pallet, horizontal-spindle machining centre, unlike other models in the HP range is equipped with a 40 instead of a 50 taper spindle

High productivity prismatic machining at an affordable price is on offer from Mills Manufacturing Technology with the new Daewoo ACE HP5000 twin-pallet, horizontal-spindle machining centre, which unlike other models in the HP range is equipped with a 40 instead of a 50 taper spindle.

The machine will be launched at the largest ever European exhibition of Daewoo CNC machine tools, called Dimf Europa 2004, to be held at Mills' Leamington Spa showrooms on the 20th, 21st and 22nd April 2004.

The accent is on minimising non-cutting time.

Compared with the equivalent 50-taper model, HP500, axis movements are up from 40 to 48 m/min in rapid traverse and from 20 to 24 when cutting, with high speed contouring now a standard feature, as is through-spindle coolant.

Daewoo has also taken the opportunity to improve other parameters to reduce idle times further, such as 1.5 instead of 2.0 sec tool-to-tool change time and a reduction in pallet change time to 7.8 sec.

The specification of the HP5000 is otherwise broadly similar to that of the HP500, the 30 kW/12,000 rpm (opt 14,000 rpm) refrigerated spindle and 500 x 500 mm pallet size being the same for both models.

Working envelope is slightly bigger at 850 x 700 x 750 mm, however, which is very large for a 40-taper machine.

The large work envelope combines with a moving column design and rigid construction utilising high quality Meehanite cast iron for the bed and column, resulting in high accuracy machining.

Full stroke positioning accuracy and repeatability are +/- 0.005 mm and +/- 0.002 mm respectively.

The X- and Y-axis movements are on the column, while Z-axis motion is on the pallet table.

The directly driven spindle unit is centrally supported on the column.

All linear axes use widely spaced linear roller bearing units and high torque AC servo drives coupled directly to the ballscrews, resulting in rapid acc/dec and high power for cutting tough materials.

For example, a 100 mm diameter face mill can remove 705 cm3/min per minute of carbon steel (SM45C), or 3,529 cm3/min of aluminium.

The standard pallet table offers one-degree incremental positional index; a 0.001-degree indexing table for full fourth axis operation is optional.

Pallet pool configurations allow extended periods of unattended working.

Either a rotary magazine up to 13 stations may be specified, or an in-line, single- or two-level system for up to 18 pallets which are moved by rail guided vehicle.

The bi-directional, chain-type tool magazine can accommodate 40 tools while optional 'tool hive' magazines for up to 170 tools can be specified - particularly useful for the larger systems, especially if a second machine is added to form an FMS.

Other options include preparation for 5-axis operation, automatic tool length measurement, workpiece probing, HSK or BIG Plus spindle/tooling, and linear glass scales in place of rotary encoders.

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