3D曲面玻璃热压加热工艺与数值模拟  

Numerical analysis of heating stage of 3D bending machine

作　　者：徐雳[1] 赛庆峰 吴石[1] 申振东 白世超 Xu Li;Sai Qingfeng;Wu Shi;Shen Zhendong;Bai Shichao(School of Mechanical & Power Engineering,Harbin University of Science and Technology, Harbin Heilongjiang 150080,China)

机构地区：[1]哈尔滨理工大学机械动力工程学院,黑龙江哈尔滨150080

出　　处：《硬质合金》2018年第6期447-456,共10页Cemented Carbides

基　　金：国家自然科学基金(项目号:51675146);黑龙江省自然科学基金(项目号:E2018048)

摘　　要：随着信息电子技术的发展,手机、电子配件等产品需求不断增加,3D曲面玻璃屏幕凭借诸多优势一度成为手机市场的宠儿。本文简述光学玻璃屏幕热弯成型过程,针对3D热弯机加热阶段热应力产生问题进行研究。采用福尔切尔方程模拟玻璃粘滞流动随温度变化关系,再根据玻璃在各温度点显现的不同状态拟定模压温度。基于Galerkin法建立玻璃材料导热方程和热应力本构方程,模拟仿真TiC-CrMo钢结硬质合金模具和光学玻璃温升过程并导出相应热应力变化曲线。分析玻璃屏幕在加热过程中各时间段产生热应力的原因,即:玻璃内外表面温度梯度不同引起热应力从而影响玻璃屏幕使用性能。针对分析结果提出六步加热控制优化方案。最后通过热弯机和TiC-CrMo刚结硬质合金模具进行实验,验证理论模型的正确性。With the development of information electronic technology, the demand for mobile phone, electronic accessories and other products is increasing. 3D curved glass screen has become the favorite of the mobile phone market with many advantages. In this paper, the thermal bending technology of optical glass screen is briefly described, and the thermal stress generation in the heating stage of 3D thermal bending machine is studied. The Focell equation is used to simulate the relationship between the viscosity flow and the temperature of the glass, and the heating temperature is determined according to the different states of the glass at each temperature point. The thermal conductivity equation and thermal stress constitutive equation of glass material were established by Galerkin method. The temperature rising procecess of TiC-CrMo rigid cemented carbide mould and optical glass is simulated, and the thermal stress change curve of glass screen is derived. The reason of thermal stress in each time period of glass screen is analyzed: the thermal stress caused by temperature gradient on the inside and outside surface of glass will affect the performance of glass screen. Based on the analysis results, a six-step heating control optimization scheme is proposed. Finally, the validity of the theoretical model is verified by the experiments carried out by hot bending machine and TiC-CrMo rigid cemented carbide die.

关 键 词：玻璃屏幕 热弯成型 仿真分析 热应力曲线 硬质合金模具 

分 类 号：TQ171.6[化学工程—玻璃工业]