Simulation of an Aspheric Glass Lens Forming Behavior in Progressive GMP Process

Recently, GMP(Glass Molding Press) process is mainly used to produce aspheric glass lenses. Because glass lens is heated at high temperature above Tg (Transformation Temperature) for forming the glass, the quality of aspheric glass lens is deteriorated by residual stresses which are generated in a a...

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Bibliographic Details
Main Authors: Chang, Sung Ho, Lee, Young Min, Jung, Tae Sung, Kang, Jeong Jin, Hong, Seok Kwan, Shin, Gwang Ho, Heo, Young Moo
Format: Conference Proceeding
Language:English
Subjects:
COMPRESSION
COMPUTERIZED SIMULATION
GLASS
HOT WORKING
LENSES
MATERIALS SCIENCE
MOLDING
OPTICS
PHASE TRANSFORMATIONS
RESIDUAL STRESSES
THERMAL ANALYSIS
THERMAL CONDUCTIVITY
THERMAL STRESSES
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Summary:Recently, GMP(Glass Molding Press) process is mainly used to produce aspheric glass lenses. Because glass lens is heated at high temperature above Tg (Transformation Temperature) for forming the glass, the quality of aspheric glass lens is deteriorated by residual stresses which are generated in a aspheric glass lens after forming. In this study, as a fundamental study to develop the mold for progressive GMP process, we conducted a aspheric glass lens forming simulation. Prior to a aspheric glass lens forming simulation, compression and thermal conductivity tests were carried out to obtain mechanical and thermal properties of K-PBK40 which is newly developed material for precision molding, and flow characteristics of K-PBK40 were obtained at high temperature. Then, using the flow characteristics obtained, compression simulation was carried out and compared with the experimental result for the purpose of verifying the obtained flow characteristics. Finally, a glass lens press simulation in progressive GMP process was carried out and we could forecast the shape of deformed glass lenses and residual stresses contribution in the structure of deformed glass lenses after forming.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.2740950