Influences of Process Parameters and Vibration Parameters on the Forming Force in the Ultrasonic‐Assisted Incremental Forming Process

Abstract

In the field of plastic forming, ultrasonic vibration has the advantages of small forming force and high forming quality, and it has been introduced into a single-point incremental plastic forming technique with high flexibility and high precision. The ultrasonic vibration single-point incremental compound forming technology with all the above advantages has been achieved. To reveal the variation tendency of the forming force under ultrasonic vibration and single-point incremental coupling, the process parameters (layer spacing, tool head radius, and feed rate) and vibration parameters (frequency and amplitude) on the forming force of the composite technology were quantitatively analyzed by theory, simulation, and experiment. The simulation and experimental results showed that ultrasonic vibration can significantly reduce the forming force of the composite technology. Compared with the simulation results, the theoretical results are not only closer to the experimental results but also have a shorter computation time and better prediction effect on the forming force. The change in the process parameters has a linear effect on the forming force, the nonlinearity of the vibratory parameters influences the forming force, and the frequencies and amplitudes in a suitable range allow the forming force to reach a minimum value. These conclusions have some significance for further studies on the ultrasonic vibratory single-point incremental composite forming technology.

Modeling and Analysis of Single Point Incremental Forming Force with Static Pressure Support and Ultrasonic Vibration

“…Based on the relationship model between forming force and vibration parameters [23], the micro-element method is used as the forming force modeling method of SPS-UV-SPIF technology. The idea of this method is from micro to macro, partial to whole.…”

“…The above balance equation applies to any micro-element in the contact area. In the strain study of the truncated cone part, it was found that the actual deformation of the sheet in the circumferential direction was much smaller than that of the radial stretching and the vertical thinning [23]. Therefore, the circumferential stress σ θ is assumed to be zero.…”

Effects of Stem Cutting in Rice Harvesting by Combine Harvester Front Header Vibration

“…Signal acquisition system used the United States of America (PCB) 356A16 type three-component acceleration sensors to test the vibration signals. e methods for testing and analyzing experimental modalities were available in Reference [29].…”