Machining centre with swivelling spindle: TILTENTA 9-4600

Designed as universal machining centres for a wide range of applications in machine and tool construction, HEDELIUS places great weight on stability and accuracy during the design phase. The result of this process was the special HEDELIUS type with the constantly cantilevered Y-axis and the resulting high rigidity and precision over the entire travel range of the Y-axis and Z-axis.

Critical assemblies such as travelling columns, beds and rotating/swivelling table units are manufactured and measured in-house at HEDELIUS. As a result, we not only always keep an eye on quality, but also recognise the possibilities and limits of modern chipping in day-to-day use. This process knowledge flows permanently into improving our products and advising our customers.

HEDELIUS uses pre-aligned roller guides from German and Swiss manufacturers. At the end of assembly, the positioning precision, repeat precision, straightness and backlash of the linear axes are finally checked and documented using a laser interferometer. The positioning accuracy of the linear axes in accordance with ISO 230-2 is regularly less than 6 µm.

The Renishaw circularity test has established itself as a test method for the accuracy of machining centres. The measurement provides information on the interaction between two linear axes and the accuracy of a circular movement. The slip-stick-free roller guides in combination with direct path measuring systems and high angular accuracy enable the milling of fits in a quality of IT6, which reduces production times and the number of spindle tools required.

The accuracy of the measuring systems has a significant influence on the angularity and parallelism of surfaces and bores. HEDELIUS uses direct angle encoders in the centre of each rotational axis in the integrated rotary tables, the swivel spindle drives and the rotating/swivelling table units. As an option, laser-based angle measurement devices measure the positioning accuracy of rotational axes with a resolution of ±1" and calibrate the axes for maximum positioning accuracy.

HEDELIUS only uses direct linear measurement devices for position detection of the X-axis, Y-axis and Z-axis. This means that the position control loop encompasses the entire feed mechanism. This is referred to as "closed loop" operation. Transmission errors in the mechanics can thus be detected by the linear measurement device on the feed axis and corrected by the control electronics.

HEDELIUS equips its machining centres with spindle coolers to dissipate the heat generated in the milling spindle. The cooling system already achieves increased thermal stability as standard. However, as not all of the heat can be dissipated by the spindle cooling, HEDELIUS optionally installs temperature sensors on the spindle, travelling column and, in some cases, on the rotary axes in order to compensate for structural displacements via the control system.