Study on multidimensional dynamic piezoelectric dynamometer for friction stir welding of thick plate
In order to solve the problem that the welding force of 2219 aluminum alloy with 18mm thickness variation range is wide and the speed is fast in friction stir welding(FSW)process,which lead to the difficulty of accurate measurement,a large-range four-fulcrum piezoelectric dynamometer with the principal of 100 kN and the lateral of 8 kN is designed.Through theoretical derivation,it is found that the thickness and span of the upper plate of the dynamometer are the main factors affecting the output of the sensor.The parametric analysis of the two factors are carried out by finite element simulation,and the reasonable valuing is determined on the basis of satisfying the range of the existing force measuring unit.Finally,the static calibration and dynamic impact experiment of the dynamometer are carried out.The results show that the nonlinearity of the dynamometer is less than 0.62%,the interdirectional interference is less than 0.65%,and the natural frequency is more than 1000 Hz,which can meet the requirement of multi-dimensional force measurement precision in the welding process.
large rangepiezoelectric dynamometerparameterizationcalibration experimentfriction stir welding
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