超薄玻璃成形浮抛锡液的工艺优化数值模拟研究

发布时间：2018-04-06 07:05

本文选题：浮法玻璃成形　切入点：浮抛锡液　出处：《燕山大学》2015年硕士论文

【摘要】：超薄浮法玻璃处于玻璃产业链的顶端,是新的经济增长点,主要用于FPD玻璃基板,仪器仪表的玻璃盖板等领域。表面波纹度是影响超薄玻璃产品质量的一个主要因素,波纹度不达标,制成TCO导电膜玻璃时,会因表面存在起伏,使透明电极接触不良,影响图像质量或触摸操作,也可能会使显示器出现“排骨彩虹”现象,使产品报废。浮法生产中玻璃是漂浮在液态金属锡上成形,因此作为浮抛介质,金属锡液的流动形式和温度制度对玻璃的表面质量起到举足轻重的作用。锡槽空间是密闭且高温的环境,传统方法无法提前预知某种生产条件下锡液的流动形式,不能加以调控。本文通过数值模拟方法,运用Fluent软件对生产1.3mm玻璃无调控和优化后锡液流动形式进行模拟,进而提高超薄浮法玻璃的成形质量。通过分析生产1.3 mm玻璃时锡液的速度场和温度场分布,并与实际生产记录相比较,验证了使用Fluent软件对超薄浮法玻璃成形过程中锡槽内锡液进行数值模拟研究的可行性。研究结果表明,普通锡槽中锡液的流动形式主要为受玻璃带牵引的前进流,边部回流和底部回流,但底部回流并不贯穿整个锡槽长度,在徐冷区处边部锡液汇入中间,在拉薄成形区形成一个螺旋状的涡流。阶梯锡槽可使回流冷锡液暂留于过渡段深层,让过渡段上层温度较高锡液参与回流,同时能降低成形区锡液的回流量和涡流量。挡坎能降低成形区中部前进锡液的流量和边部回流量,部分回流锡液可越过挡坎向前回流。加入挡坎的阶梯锡槽成形区温度更为均匀,冷却一区温度降低,有利于玻璃的成形和冷却。挡旗能将成形区部分锡液固定在某个区域流动,使边部与中部锡液充分交换,从冷却区回流锡液大部分在过渡段处转为前进流,少部分绕过挡旗向锡槽前端流动。玻璃带覆盖区下方的横向温度趋于一致,成形区横向温差显著降低,有利于缩小厚薄差提高成形质量。
[Abstract]:Ultra-thin float glass at the top of the glass industry chain, is a new economic growth point, mainly for the FPD glass substrate, glass cover field instrumentation. Surface waviness is a major factor affecting the quality of the products of ultra-thin glass, waviness is not standard, made of TCO conductive film glass, due to surface fluctuation the transparent electrode is bad, affect the image quality or touch operation, may also make the display "Rainbow ribs" phenomenon, make the product in the production of float glass is scrapped. Floating in the liquid metal forming tin, so as the float medium tin liquid flow pattern and temperature system on the surface quality of glass to the pivotal role. The bath space is closed and the high temperature environment, the traditional methods can not predict the flow form of some liquid tin production conditions, can not be regulated through numerical simulation. The method, using Fluent software for 1.3mm glass production without control and optimization of tin fluid flow form simulation, so as to improve the forming quality of thin float glass production. Through the analysis of 1.3 mm glass tin liquid velocity field and temperature field, and compared with the actual production records, validation of the use of Fluent software on ultra-thin float glass in the forming process of tin bath liquid tin the feasibility of numerical simulation. The results show that the flow form of ordinary liquid tin in tin bath is mainly affected by the glass with traction forward flow, edge and bottom reflux reflux, but not the bottom backflow throughout the entire length of tin bath, into the cold zone in the middle of Xu edge tin liquid, a spiral vortex is formed in the thin forming area. The ladder tin tank can make the cold reflux liquid tin persistence in the transition section of deep, let the upper transition temperature is higher in the tin liquid reflux, can reduce the forming at the same time Back flow and vortex flow region of molten tin. Bar can reduce the forming area of central forward tin liquid flow and the edge of the back flow, partial reflux liquid tin cross bar forward return. Stepped bar tin groove forming zone is more uniform temperature, cooling temperature reduced, there is conducive to forming and cooling the glass block can be formed. Its area of liquid tin in a fixed flow area, the edge of the full exchange with central tin liquid from the cooling zone reflow tin liquid mostly in the transition section to forward flow, a small part of its flow to bypass the blocking tin channel front-end. The transverse temperature below the glass covered area consistent, forming area transverse temperature decreased significantly, reduce the thickness difference to improve forming quality.

【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ171.6

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