本文選題：浮法玻璃成形　切入點(diǎn)：浮拋錫液　出處：《燕山大學(xué)》2015年碩士論文

【摘要】：超薄浮法玻璃處于玻璃產(chǎn)業(yè)鏈的頂端,是新的經(jīng)濟(jì)增長點(diǎn),主要用于FPD玻璃基板,儀器儀表的玻璃蓋板等領(lǐng)域。表面波紋度是影響超薄玻璃產(chǎn)品質(zhì)量的一個主要因素,波紋度不達(dá)標(biāo),制成TCO導(dǎo)電膜玻璃時,會因表面存在起伏,使透明電極接觸不良,影響圖像質(zhì)量或觸摸操作,也可能會使顯示器出現(xiàn)“排骨彩虹”現(xiàn)象,使產(chǎn)品報(bào)廢。浮法生產(chǎn)中玻璃是漂浮在液態(tài)金屬錫上成形,因此作為浮拋介質(zhì),金屬錫液的流動形式和溫度制度對玻璃的表面質(zhì)量起到舉足輕重的作用。錫槽空間是密閉且高溫的環(huán)境,傳統(tǒng)方法無法提前預(yù)知某種生產(chǎn)條件下錫液的流動形式,不能加以調(diào)控。本文通過數(shù)值模擬方法,運(yùn)用Fluent軟件對生產(chǎn)1.3mm玻璃無調(diào)控和優(yōu)化后錫液流動形式進(jìn)行模擬,進(jìn)而提高超薄浮法玻璃的成形質(zhì)量。通過分析生產(chǎn)1.3 mm玻璃時錫液的速度場和溫度場分布,并與實(shí)際生產(chǎn)記錄相比較,驗(yàn)證了使用Fluent軟件對超薄浮法玻璃成形過程中錫槽內(nèi)錫液進(jìn)行數(shù)值模擬研究的可行性。研究結(jié)果表明,普通錫槽中錫液的流動形式主要為受玻璃帶牽引的前進(jìn)流,邊部回流和底部回流,但底部回流并不貫穿整個錫槽長度,在徐冷區(qū)處邊部錫液匯入中間,在拉薄成形區(qū)形成一個螺旋狀的渦流。階梯錫槽可使回流冷錫液暫留于過渡段深層,讓過渡段上層溫度較高錫液參與回流,同時能降低成形區(qū)錫液的回流量和渦流量。擋坎能降低成形區(qū)中部前進(jìn)錫液的流量和邊部回流量,部分回流錫液可越過擋坎向前回流。加入擋坎的階梯錫槽成形區(qū)溫度更為均勻,冷卻一區(qū)溫度降低,有利于玻璃的成形和冷卻。擋旗能將成形區(qū)部分錫液固定在某個區(qū)域流動,使邊部與中部錫液充分交換,從冷卻區(qū)回流錫液大部分在過渡段處轉(zhuǎn)為前進(jìn)流,少部分繞過擋旗向錫槽前端流動。玻璃帶覆蓋區(qū)下方的橫向溫度趨于一致,成形區(qū)橫向溫差顯著降低,有利于縮小厚薄差提高成形質(zhì)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.

【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ171.6

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