The operating principle of a screw connection exists in pressing the parts to connect. The process force is mainly due to the pre-tensioning force on the screw. The pre-tensioning force is the quality-determining characteristic for each screw connection. Breaking the screw or having a loose screw connection are the two extreme consequences of an incorrectly adjusted screw pre-tensioning force.
It is generally accepted that the influence of the elongation or tension caused by the pre-tensioning force on the rotations of ultrasonic waves offers the possibility to determine the pre-tensioning force, the elongation or the extendibility of a screw. In combination with the so-called "acoustoelastic effect", our flexSonic system controls the screwdriving tool depending on the pre-tension screw force. Therefor you can rely on your standard screws and no need to use special (expensive) screws.
For technical details and descriptions of the system and the process please refer to specific EST flexSonic brochure.
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