期刊论文

Simulation and experiment of non-isothermal hot pressing of smalldiameter aspherical chalcogenide glass lens

中文

红外与激光工程

1007-2276

2019

48

8

199-210

10.3788/IRLA201948.0814006

国家自然科学基金(51405034,51605045,51875050) 工程车辆轻量化与可靠性技术湖南省高校重点实验室(长沙理工大学)开放基金(2017kfjj06)

本校为第一机构

为提高小口径非球面硫系玻璃镜片热压成型质量, 避免成型缺陷, 通过热压过程的有限元分析, 提出了一种新的非等温热压成型法。在上模仁和上加热板之间设置加热间隙, 对上、下加热板设置不同的加热温度, 以实现玻璃预形体的非等温加热。首先, 根据硫系玻璃高温粘弹性本构模型和热传递模型, 结合相关参数建立了镜片热压过程的有限元模型; 接着, 采用所建立的模型, 分析了非等温温差对玻璃预形体内部的温度分布、成型镜片最大残余应力分布及轮廓偏移量的影响, 以确定最佳的温差值; 最后, 进行了镜片的非等温热压成型实验, 并将仿真和实验结果进行了对比研究, 以验证仿真模型和结果的有效性。仿真与...

Based on the finite element analysis of hot pressing process, a new non -isothermal molding method was proposed for improving hot pressing quality of small-diameter aspherical chalcogenide glass lenses and avoiding pressing defects. A heating gap was set between the upper mold core and heating plate, and the upper and lower heating plate were heated by using different temperatures to realize nonisothermal heating of the glass preform. Firstly, based on the high temperature viscoelastic constitutive and heat transfer model of chalcogenide glass,...