Securely calculate clamping forces in advance
ARNOLD’s pre-clamp load ultrasound measurement determines the run-time difference of an ultrasound pulse induced on a loaded and unloaded screw. This means that reliable measurement of clamping forces in the original application can be achieved.
With this measurement system, an ultrasound impulse generated by a piezo element passes through the fastener, and is then reflected back as an echo. A measuring instrument captures the echo and accurately calculates the impulse time which is specific to the screw, and which increases linearly as the screw tightens in the elastic range. A comparison of the pulse times before and after tightening the screw – taking further factors into account – can provide conclusions about the clamping force.