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09 November 2017

Schunk hydraulic compensating chuck jaws positively tackle deformation, centrifugal force, surface finish and tool life issues

Schunk compensating chuck jaws Schunk hydraulic compensating chuck jaws positively tackle deformation, centrifugal force, surface finish and tool life issues
Hydraulic compensating chuck jaws from Schunk are said to “have set a new benchmark for low-deformation workpiece clamping”. It is the first time that chuck jaws for compensating workpiece variation have successfully been combined with centrifugal force compensation, vibration-damping characteristics and micron-precision concentricity.

Available for all lathe chuck sizes and serration types, the hydraulic compensation jaws are suitable for low-deformation OD clamping of rough and finished surfaces.

The jaws’ integrated oil chamber is a central feature, above which are two oscillating clamping elements for clamping rough or finished parts. The jaws individually adapt to the workpiece, form tolerances in castings for example. Compared to conventional three-point clamping, the number of clamping points is doubled, with this lowering deformation of the workpiece, while also ensuring that roundness is significantly improved.

The hydraulic system also allows for automatic centrifugal force compensation. At high speeds, the hydraulic clamping system automatically guarantees centrifugal force compensation. This ensures that the clamping force is always reliably maintained.

In order to minimise workpiece deformation, the clamping force can be considerably reduced, in comparison with previous solutions, without restrictions on process reliability. For maximum precision, concentricity can also be adjusted with micron-precision on the chuck jaws. Additionally, the vibration-damping characteristics of the oil chamber system benefit the surface quality of the workpiece, with this also enhancing tool life.

Andrew Allcock

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Schunk Intec Ltd

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