• English
  • Deutsch
  • Log In
    Password Login
    Research Outputs
    Fundings & Projects
    Researchers
    Institutes
    Statistics
Repository logo
Fraunhofer-Gesellschaft
  1. Home
  2. Fraunhofer-Gesellschaft
  3. Artikel
  4. Numerical simulation assisted curve compensation in compression molding of high precision aspherical glass lenses
 
  • Details
  • Full
Options
2009
Journal Article
Title

Numerical simulation assisted curve compensation in compression molding of high precision aspherical glass lenses

Abstract
Compression molding is an effective high volume and net-shape fabrication method for aspherical lenses and precision glass optical components in general. Geometrical deviation (or curve change as often referred to in industry) incurred during heating, molding, and cooling processes is a critically important manufacturing quality parameter. In the compression glass molding process, there are many factors that could lead to curve change in final products, such as thermal expansion, stress and structural relaxation, and inhomogeneous temperature distribution inside the molding machine. In this research, an integrated numerical simulation scheme was developed to predict curve change in molded glass aspherical lenses. The geometrical deviation in the final lens shape was analyzed using both an experimental approach and a numerical simulation with a finite element method program. Specifically, numerical simulation was compared with experimental results to validate the proposed manufacturing approach. The measurements showed that the difference between numerical simulation and experimental results was less than 2 mu m. Based on the comparison, the mold curve was revised using numerical simulation in order to produce more accurate lens shapes. The glass lenses molded using the compensated molds showed a much better agreement with the design value than the lenses molded without compensation. It has been demonstrated in this research that numerical simulation can be used to predict the final geometrical shape of compression molded precision glass components. This research provided an opportunity for optical manufacturers to achieve a lower production cost and a shorter cycle time.
Author(s)
Wang, Fei
Chen, Yang
Klocke, Fritz
Pongs, Guido
Yi, Allen Y.
Journal
Journal of manufacturing science and engineering  
DOI
10.1115/1.3063652
Language
English
Fraunhofer-Institut für Produktionstechnologie IPT  
  • Cookie settings
  • Imprint
  • Privacy policy
  • Api
  • Contact
© 2024