Optimization on PVDF Film Force Sensor for Steel Ball Forging Fault Diagnosis

Bearing capacity and sensitivity are two important indicators of force sensor measurement performance. In this paper, the parameters optimization and performance analysis of the piezoelectric film force sensor for steel ball cold heading machine are carried out for the piezoelectric film force sensor for detecting cold ball force of steel ball. In order to avoid local stress concentration, a modified scheme of the structure of the piezoelectric film force sensor is proposed. A finite element model of the sensor was established, and then the main parameters affecting the bearing capacity and sensitivity of the sensor were simulated and optimized. The size of the sensor stress concentration area was analyzed. Finally, the optimized size parameters of the piezoelectric film force sensor were obtained, which improved the sensor sensitivity and its load capacity.