The functional principle of a screw connection consists in pressing the parts to be connected together. The process force essentially results from the preload force of the screw. The preload force is the quality-determining parameter for every screw connection. Screw breakage or loosening of the screw connection are the two extreme consequences of an incorrectly set screw preload force.
It is generally accepted that the influence of the strain or stress caused by the preload force on the propagation times of ultrasonic waves offers the possibility to determine the preload force, the strain or the elongation of a bolt. In combination with the so-called "acousto-elastic effect", our flexSonic system controls the screwing tool depending on the screw preload force. You can use your standard screws and do not have to use any special (expensive) screws.
Technical details as well as descriptions of the system and the process are contained in the special EST flexSonic brochure.
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