Preload force measuring system flexSonic

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.

  • Evaluation of ultrasonic wave propagation using specific ultrasonic transducers
  • Integration of the ultrasonic transducer into the screwdriver nut with consideration of suitability for volume production
  • Non-contact signal transmission, automated measurement and data analysis
  • Control of screwdriver and screw driving process unsing the recorded run time measurement results
  • Continuous comparison with estimated characteristic diagram

For technical details and descriptions of the system and the process please refer to specific EST flexSonic brochure.

Click here to request

Your contact
at EST Technologie

Phone: +49 7367 923 92-0

Our products

Versatile drive options for accurate
geometric requirements and
custom sensor technology for reliable results.

Schmid Maschinenbau Logo EST Logo Market CleanTec Logo Schmid Maschinery Logo