Versatile new heavy duty machining centre range

Edited by the Engineeringtalk editorial team Jul 19, 2001

The CWK Classic range of heavy duty machining centres can be specified with a horizontal spindle, a pivoting horizontal/vertical spindle head or with an extendable NC quill

The introduction of the CWK 'Classic' range of heavy duty machining centres from Heckert provides Brackley-based Traub Heckert UK with machines that can be specified with a horizontal spindle, a pivoting horizontal/vertical spindle head or with an extendable NC quill for producing components weighing up to 5,000 kg.

The CWK range is available in 1000, 1250 and 1600 designated versions giving X-axis travels up to 2,300 mm, Y-axis up to 1,550 mm and Z-axis up to 1,525 mm while spindle power is rated up to 50 kW producing a metal removal rate of 1,320 cm3/min, a range of other spindle options can provide a high torque drive up to 1,260 Nm and maximum speeds of 4,000 revs/min, 6,000 revs/min or 10,000 revs/min.

Built on a T-bed machining platform design with linear guideways accommodating rapid traverse rates of 30 m/min, positioning accuracy is high for such a large capacity machine at seven microns with four microns repeatability.

The bed carries longitudinal and cross guideways for the column and table slide and hydraulic counterbalance compensation is applied to the spindle assembly.

With the option of a horizontal/vertical head combination, five-sided machining can be performed with the change in spindle attitude taking just three seconds to accomplish.

With this unit, 22 kW of spindle power is available to develop a torque of 800 Nm.

High rigidity and machining stability is maintained with this indexing head through a Hirth- type coupling aided by electronic positioning and temperature control.

With the option of a 50 taper extendable quill, a separate axis drive gives infinitely programmable travel of 500 mm.

Spindle power is maintained at 22 kW with a top speed of 4,000 revs/min.

Twin pallet sizes are 1,000 mm by 800 mm, 1,250 mm by 1,000 mm and 1,600 mm by 1,250 mm for each respective machine size.

Traverse rates are 60 m/min and pallet changeover time varies between 36 secs and 52 secs according to size.

In keeping with the modular construction of the machine range, users can also specify either an NC rotary table with 1o indexing as standard or full fourth axis as an option or a linear multiple pallet system.

In addition, the machines can be customised to form flexible cells or systemised machining lines.

Two types of tooling systems are available using chain conveyors or high density towers.

The chain conveyors can carry 60 or 80 units weighing up to 35 kg per tool, while the recently introduced high density tower magazines can hold 120, 180 or 240 tools.

Chip to chip time for tools up to 250 mm diameter is 12 secs and tools up to 600 mm long can be accommodated.

Control is via options of Heidenhain TNC 426 or 430, Fanuc 16i Siemens 840D and high pressure coolant up to 50 bar with through the tool supply is standard.