Clamping coupling for rotary swivel tables
Angular accuracy at thousandths level
One of the highlights of Ringspann's appearance at this year's EMO was the new clamping coupling for fixing driven rotary/tilt tables in multi-axis machining centers, a mechanical-hydraulic high-precision solution with high angular accuracy and holding torques of up to 2,400 Nm.
Rotary swivel tables and portals are used to position the A and C axes in the coordinate field of modern machine tools and machining centers. Their kinematic task is to support the precise and fast approach of the workpiece in any required angular position. In the latest generation of rotary/tilt tables, this is achieved by positioning axes that are driven by directly and precisely controllable torque motors. After assuming their defined angular positions, they are firmly clamped and must hold their position absolutely securely during ongoing machining - i.e. under load. The market offers a range of different clamping systems for this task. However, the ever-increasing demands of users in terms of achievable accuracies and transmittable torques mean that both manufacturers of rotary/tilt tables and machine tool builders are increasingly looking for ever more powerful clamping systems for their positioning axes. Ringspann recognized this trend early on and developed a new clamping coupling for clamping rotary/tilt tables. A number of well-known machine manufacturers have now become aware of the new clamping coupling and are planning its use. With a maximum torsion angle of just 0.007 degrees, a holding torque of up to 2,400 Nm and very high torsional rigidity, the new ring clamping clamping clutch paves the way for the implementation of the highest precision and force requirements when clamping the driven positioning axes of rotary swivel tables in machine tools.
Mechanically clamped, hydraulically released
At this year's EMO, visitors to the Ringspann stand were able to find out first-hand about the features of the precision clamping clutch and learned that high-quality clamping washers from the Ringspann range are used in its design, which transfer the axial force of helical compression springs into a radially acting force and thereby taper a specially designed, ring-shaped deformation body. This purely mechanical action ensures an absolutely torsion-proof all-round clamping of the axle journal of the positioning axle. The clamping is quickly released again by applying 115 bar hydraulic pressure to the clamping clutch. As a result, the positioning axis of the rotary/tilt table is immediately free to move to the next angular position. The new high-precision solution therefore also supports rapid changes between the different angular positions of a machining process.
Clamping fixture innovations in Hanover
The company also showcased numerous other solutions from its range of clamping devices at EMO, including precision clamping devices for the mechanical machining of cylindrical inner and outer surfaces, many of which are available as standardized complete clamping devices. Last but not least, the innovative HDDS expansion sleeve mandrel was once again a crowd puller at the trade fair stand. This economical alternative to hydraulic expansion mandrels for use in gearing technology and fine machining impresses with concentricity accuracies of ≤ 5 µm, accommodates workpieces with bores up to tolerance class IT10 and reduces the effort required for feeding and positioning technology when used fully automatically. Depending on the version, the HHDS can clamp bores from 23 mm in diameter.
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