Of course, the motor and the gearhead play an extremly important partThe FAULHABER drive unit with brushless motor and planetary gearhead provides the ideal performance for this. "We achieve very short cycle times due to the high acceleration capacity of the drives, i.e. excellent productivity. The brushless FAULHABER drive is also characterised by having an extremely long service life, therefore qualifying the screwdriving system for mass production under 24/7 conditions." Particularly for safety-relevant threaded connections in the automotive area (risk class A threaded connections, VDI directive 2862), screwdrivers must be equipped with sensor systems for measuring at least one control variable, explains Stefan Flaig. "We measure the torque and the rotation angle directly, and also have redundancy as a third variable by simultaneously recording the motor current. This is used for permanent self-monitoring of system integrity.
We measure torque and rotation angle directlyIn full-automatic screw fixing, a sensor screwdriver such as this is the best choice because it safeguards the core process of the automation system.
Screwdriving processes which are difficult to control with little "leeway" between a loose screw (without clamping force) and the destruction of the screw connection (due to over-rotation) can be kept in check by means of multi-stage precision screwdriving. Defective workpieces cause screwdriving errors which can be reliably detected by multiple overlaid parameter windows within the crewdriving stage sequence (zero error production). A considerable amount of value was placed on making the systems intuitive and simple to operate using Windows software. This is used to program the screwdriving parameters, provides process transparency by means of a differentiated display of the screwdriving curves in real time, and provides the best possible options for process data documentation. Combining a screwdriving automation system with an intelligent, stationary torque sensor with a screw falling simulator makes automated cyclic checking of the screwdriving system’s machine capability possible, e.g. every day before the start of a shift.