As is so often the case for low-deformation workpiece clamping: there is no one-size-fits-all solution. Only when all the aspects have been clarified can the optimal clamping solution be defined.
Those wanting to turn, mill or grind rings, flanges, housings or other thin-walled parts will quickly reach the limits of what is possible using conventional chucks or face plates: the parts are deformed in the clamping process, shaping and geometric tolerances are difficult to adhere to and the interference contours of the clamping devices restrict the accessibility. There are a great deal of alternatives here – from the compensating multi-jaw chucks, the magnetic clamping technology right up to the pendulum jaws. To ensure things run smoothly, it is worth knowing the strengths of the individual problem solvers, because this saves time, money and often nerves.
As is so often the case for low-deformation workpiece clamping: there is no one-size-fits-all solution. The requirements of the workpieces, type and frequency of the machining as well as the integration into the process change vary so severely that an individual observation at the user level is always worthwhile. The following questions are primarily important here: what parts are to be machined in what batch sizes? How flexible must the machine be able to be used? What shape and position tolerances must be adhered to? How will the parts spectrum develop in the future? Only when these and other aspects have been clarified can the optimal clamping solution be defined.
As the jaws are adjusted to the workpiece, they can compensate for form tolerances within a certain range, for instance with cast bodies. It is beneficial if such pendulum jaws can be fixed for finish machining or for clamping pre-turned surfaces. Furthermore, the jaws should be as light as possible so as to achieve faster speeds. Calculation programs can be used for calculating what compensation is required for achieving specified concentricity tolerances. Primarily for small tolerances, experience pays off, because with matured special solutions, enormous effects can be attained. But there are also restrictions: pendulum jaws are comparably expensive, they wear out easily, are sometimes quite heavy and restricted when it comes to flexibility.
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 on the component, the concentricity can also be adjusted micron-precisely on the chuck jaws. Additionally, the vibration-damping characteristics of the oil chamber system result in a better surface quality of the workpiece and the tool life. Hydraulic compensation jaws are suitable for low-deformation OD clamping of rough and finished parts and are available for all lathe chuck sizes and serration types.
Workpieces are aligned and clamped in the 6-jaw chucks in no time at all. The chucks are perfectly adapted to the raw part with their oscillating jaws. For finish machining or for clamping pre-turned surfaces, the pendulums can be clamped similar to the pendulum jaws in the center positions, meaning all six jaws can move concentrically. Because of its high precision, it is possible to eliminate entire production steps, for example, by reaching tolerances during the finishing process that would otherwise only be reached in complex grinding operations.
To align the workpieces, the holding force can be adjusted using the control system or the holding force regulation. In order to ensure optimum stability, radial pole plates up to a diameter of 4,000 mm should be produced from a single piece. For larger plate diameters, plates in segmental design may be advantageous as these can be transported more easily. To suit the respective application, there are standardized radial pole plates in three versions: for grinding operations, as an AlNiCo single magnet system; for turning operations as an AlNiCo double magnet system with high holding forces. And finally for demanding volume machining with milling and turning as an extra strong AlNiCo neodymium magnet system.
For details, contact Satish Sadasivan on Tel: 080 4053 8999 or Email: firstname.lastname@example.org