MICRO MACHINING | CASE STUDY
To dress the grinding wheel there are two options, first the work is carried out by a fixed diamond, which is monitored by the ultrasound sensor technology or the optional grinding wheel dressing spindle will be installed. This spindle is controlled by the NC control unit and also features integrated ultrasound sensor technology. Through the simple change of the dressing tools, almost all grinding tools can be sharpened and shaped.
Various grinding cycles are available, which enabled the machine operator to utilise his machine for a broad range of grinding tasks, for example:
■ Freely definable pendulum stroke: a programmable pendulum stroke of the Z-axis, that is independent from the NC group, enables the processing of interior and exterior contours during a cross grinding process. In contrast to the eccentric processing, the utilisation of glass scale-regulated axes not only enables round forms but also freeform profiles on the X-Y plane.
<< Figure 2: 5-axis Pyramid Nano milling centre from Kern Microtechnik.>>
Further, manipulating the fourth and fifth axis can help minimise the set-up procedure, which normally takes a lot of time when working with conventional grinding machines. The process incorporating an automatic workpiece changing system is an optimal solution ensuring high quality and low costs. During the finish grinding operation, the spark out cycles is monitored and the processing time is optimised.
■ Air grinding cycles: if the wheel is not grinding the workpiece, this is recognised and the feed rate will be increased automatically.
■ Spark out cycles: sensor technology recognises when the spark out has been completed and ends the process automatically.
■ Hole grinding cycles: functional pre-defined cycles available. ■ Dressing cycles: simplify and support the programming of the required wheel dressing procedures.
>> Continued on page 24
23 | commercial micro manufacturing international Vol 7 No.4
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