NUMERICAL ANALYSIS METHOD AND DEVICE FOR PRESS FORMING OF GLASS-FORMED ELEMENT

摘要

PROBLEM TO BE SOLVED: To provide a numerical analysis method where the forming process of a glass optical element, especially its pressing step, can be estimated in good precision.;SOLUTION: A glass raw material is divided to a limited number of micro-areas and the processing time of forming is divided to a plurality of time steps Δt for the numerical calculation of a forming process where the glass optical element is formed by pressing the glass raw material softened with heat in a forming die and then the glass optical element is formed after cooling. When thermal stress analysis associated with heat transfer analysis and stress deformation analysis is performed, the thermal stress analysis (S104, S105) is performed for an analysis model (S107) under the condition that the time steps Δt are satisfied with the formula of Δtc=(ρC/6κ)×ΔL² or more (wherein, ρ is a density, C is specific heat, κ is thermal conductivity and ΔL is an element dimension around the contact part of the glass raw material with the forming die).;COPYRIGHT: (C)2006,JPO&NCIPI