Versatile Machining Centre For Smaller Workpieces

The layout of the C 22 U is based on the manufacturer's proven gantry design with staggered Y-axis slideways, mineral cast bed for good vibration damping and, in the case of the 5-axis model, a trunnion-mounted rotary table. Working envelope is 450 x 600 x 330 mm in X, Y and Z, all linear axis motions being above the table.

High accuracy and top quality surface finish on machined components are claimed for the machine, which is particularly applicable to the tool- and mould-making sector, the medical and aerospace industries, and precision job shops.

In the 'dynamic' version of the machining centre, acceleration of 15 m/s2 (1.5 g) to rapid traverse speeds of 50 m/min are achieved in X, Y and Z. In combination with torque motors in the rotary C- and A-axes, the quick linear travels promote short machining cycles by maximising in-cut feed rates and minimising idle times.

The space-saving, circular tool magazine integrated into the machine body exchanges tools quickly; 4.5 seconds chip-to-chip is quoted, in accordance with VDI 2852. There is space for 55 tools in SK40/HSK A 63 holders or 65 toolholders with HSK A 50 or HSK E 40 tapers. The generous capacity allows complete machining of highly complex workpieces or entire product families, or else a wide variety of individual parts, saving additional set-ups.

There is a choice of five spindle drives rated up to 37 kW / 80 Nm, with maximum speeds from 15,000 to 42,000 rpm. For 15,000 rpm and 18,000 rpm versions, an ingeniously simple collision protection system based on a crush sleeve ensures that in the case of a spindle crash, only the sleeve needs to be replaced, minimising repair costs. All spindles feature Hermle’s new slimline design to facilitate machining of deep cavities.

Three table systems are offered: a fixed table with a 600 x 630 mm clamping surface capable of supporting a load of 750 kg; a 320 mm diameter, swivelling rotary table with worm gear drive, mounted on a ±135 degree trunnion driven from one side; and a similar table with a direct torque drive and single or tandem drive to the trunnion. Maximum weight of component and fixture in 5-axis arrangements is 300 kg.

Depending on the amount of swarf produced, a chute or different conveyors are available. The latter can be arranged at the rear or to the left or right of the machine, according to customer preference.

There is a choice of Heidenhain iTNC 530 or Siemens 840 D SL control systems. A convenient new feature is that the control panel with its 19 inch screen can be tilted by up to 30 degrees. The height of the panel can also be adjusted by ±100 mm, allowing users to personalise the position of the control.

The C 22 U is transported as a single unit, has a four-point support and requires no special foundations. Adaptation to partial or full automation is enabled by a wide selection of Hermle equipment, such as pallet change and storage systems, flexible manufacturing cells with workpiece storage and material flow, and component handling systems including robotic solutions.