Acoustic chamber length performance analysis in ultrasonic pulsating water jet erosion of ductile material


Nag A., Hloch S., Čuha D., Dixit A. R., TOZAN H., Petrů J., ...More

Journal of Manufacturing Processes, vol.47, pp.347-356, 2019 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 47
  • Publication Date: 2019
  • Doi Number: 10.1016/j.jmapro.2019.10.008
  • Journal Name: Journal of Manufacturing Processes
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.347-356
  • Keywords: Non-abrasive jet, Pulsating water jet, Acoustic chamber length, Standoff distance, Erosion
  • Istanbul Medipol University Affiliated: Yes

Abstract

Ultrasonic pulsating water jets are a technological modification of water jet technologies that disintegrate materials at pressures ≤100 MPa. Disintegration occurs at a non-systematically determined standoff distance z [mm] as a result of variable axial jet speeds determined by the acoustic chamber length. Water velocity fluctuations are converted from pressure fluctuations present in the acoustic chamber using a nozzle. Pressure fluctuations are generated by an ultrasonic sonotrode with a frequency of 20 kHz. The impulse travels through the acoustic chamber, which is geometrically designed to vary its length from 0 mm to 25 mm with a mechanical nut. A PWJ system can be tuned within this interval to achieve the desired PWJ performance. Until now, the synergic effects of the standoff distance z [mm] and the acoustic chamber length lc [mm] on material interactions have not been clarified in the literature. Therefore, this study discusses how the length of the acoustic chamber lc is related to the nozzle's standoff distance z [mm] from the surface of the material and from the point of achieved maximal depth h [mm]. The length of the chamber was gradually increased by one millimetre from 5 to 22 mm. Subsequently, PWJs with p = 30 MPa and 40 MPa were tested. The robot arm carrying the nozzle head travelled along a programmed trajectory at an angle of 16° starting from z = 5 mm with a traverse speed v = 5 mm/s. It has been found that the effect of acoustic chamber length on the disintegration within an erosion interval has a hyperbolic course.