7 September 2013 FEM analysis of hot-pressing process of aspheric glass P-SK57 lens
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Abstract
Lens molding has become the promising technique to conduct mass produce of aspheric glass lens. It overcomes some disadvantages of traditional grinding or turning methods, such as high cost, low efficiency, unstable accuracy, and so on. Up to now, the lens molding process has been looked on as one of the reliable methods in fabrication of aspheric glass lens. However, in real production, one has found that it’s hard to control the molding parameters, e.g. molding temperature, molding period, molding speed and pressing pressure, etc. Therefore it’s necessary to develop the specific molding processes for a certain glass material. In this paper, SCHOTT P-SK57 is adopted to carry out the lens molding analysis in order to achieve the relative processing parameters. The molding cases are analyzed based on three different temperatures of 510°C, 520°C, and 530°C, higher than transition point 493°C of P-SK57. Through continuous heating and pressing simulation, the results show that the best pressing temperature could be about 530°C, at which the residual stress is only 5.22MPa (with the molding speed of 0.1mm/s).
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Yongjian Zhu, Jingxin Na, Yu Wang, Anhu Li, Yanan Zhi, Yufeng Fan, "FEM analysis of hot-pressing process of aspheric glass P-SK57 lens", Proc. SPIE 8838, Optical Manufacturing and Testing X, 88380Z (7 September 2013); doi: 10.1117/12.2023133; https://doi.org/10.1117/12.2023133
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