Loading...

Feasibility Study on Ultrasonic Vibration Assisted Milling Process of BK7 Optical Glass

Jamshidi Hassanabadi, Ali | 2018

608 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51248 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Akbari, Javad
  7. Abstract:
  8. This research studies the feasibility of the BK7 optical glass milling process with ultrasonic vibrations. Due to the fragility of glasses, especially optical glasses, machining is very sensitive and complex. For this reason, it is necessary to think for the glass machiners to minimize the defects and failures of the process. So far, efforts have been made to reduce the defects caused by machining on brittle materials, such as increasing the speed of the period, reducing the feed rate of the tool, changing the geometry and the type of tool, the type of process lubrication, etc. In addition, other operations performed to improve the surface of the glass are of better quality, using hybrid or auxiliary processes, for example, adding ultrasonic vibrations to the milling process. The use of ultrasonic vibrations in machining processes in recent years has been recognized as a suitable way to reduce machining forces and improve the surface quality and surface fineness of machined parts. In the present study, the milling process on BK7 optical glass was performed using ultrasonic vibrations to show the positive effects of these vibrations and compare with the results of milling without ultrasonic help. Therefore, in order to produce ultrasonic vibrations, it is necessary to design and construct a suitable horn, which, Due to the needs and limitations of this project, the staircase horn made of 7075 Aluminum was designed and built. The following attempts were made to determine the effective parameters in the milling process and product quality. For this purpose, by analyzing the results such as surface roughness and machining force, it turned out that feed rate, spindle speed, and ultrasonic vibrations have the greatest effect on surface roughness, and the depth of the axial cutting is not affected. In terms of machining force, the feed rate, cutting depth and spindle speed are all influential. Finally, it became clear that the type of tool on the surface quality played a very important role, so that in the same conditions it would improve about 3 microns of average roughness
  9. Keywords:
  10. Ultrasonic-Vibration ; Brittle Materials ; Horns ; Milling ; BK7 Optical Glass ; Surface Quality

 Digital Object List

 Bookmark

No TOC