Geo Kingsbury Introduces Hermle VMC

Hermle has added a machining centre to its range of vertical-spindle machines, which is applicable to the tool- and mould-making sector, the medical and aerospace industries, plus precision job shops. Sole UK agent, Geo Kingsbury Machine Tools, said that the design of the C 22 U offers maximum flexibility, as the user can choose between three- and five-axis configurations, as well as different options for table, spindle, tooling, coolant delivery, swarf management and automation.

The layout of the C 22 U is based on the manufacturer's gantry design with staggered Y-axis slideways, mineral cast bed for good vibration damping and, in the case of the five-axis model, a trunnion-mounted rotary table. Working envelope is 450 x 600 x 330mm in X, Y and Z, all linear axis motions being above the table. In the 'dynamic' version of the machining centre, acceleration of 15m/s2 (1.5g) to rapid traverse speeds of 50m/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 tool holders with HSK A 50 or HSK E 40 tapers. Its capacity allows complete machining of highly complex workpieces or entire product ranges, or a wide variety of individual parts, saving additional set-ups.

There is a choice of five spindle drives rated up to 37kW/80Nm, with maximum speeds from 15,000 to 42,000rpm. For 15,000rpm and 18,000rpm versions, a 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 slimline design to facilitate machining of deep cavities. Three table systems are offered: a fixed table with a 600 x 630mm clamping surface capable of supporting a load of 750kg; a 320mm diameter, swivelling rotary table with worm gear drive, mounted on a +/-135deg 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 five-axis arrangements is 300kg. 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. One feature is that the control panel with its 19in screen can be tilted up to 30deg.

The height of the panel can also be adjusted by +/-100mm, 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, as well as component handling systems including robotic solutions.

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