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鋼化爐急冷溫度對鋼化玻璃質(zhì)量的影響
來源:www.szkingly.com 發(fā)布時間:2014-10-29

      鋼化玻璃質(zhì)量的好壞,在鋼化爐的冷卻工藝中主要受到四個方面的影響:急冷溫度、急冷速度、冷卻時間和玻璃厚度。這些因素之間既獨立存在又相互影響。本文主要概述急冷溫度對于鋼化玻璃質(zhì)量的影響。
      急冷溫度是指玻璃出加熱爐進急冷風柵時玻璃板面的溫度。這個溫度在玻璃整個板面的上下表面、中間層及不同部位應該是均勻的,或其各位置之間的溫度差應盡量小。 
      對于整個板面的玻璃來說,當玻璃上表面急冷時的溫度高于其下表面時,玻璃的整個板面會出現(xiàn)前后兩端向上彎曲的現(xiàn)象;反之,當玻璃上表面的急冷溫度低于其下表面時,玻璃的整個板面會出現(xiàn)前后兩端向下彎曲(中間鼓起)的現(xiàn)象。而當玻璃局部區(qū)域相當于整個板面的急冷溫度相差較大時,鋼化后的玻璃會出現(xiàn)局部波形變形,甚至由于局部應力相差過大而產(chǎn)生玻璃破碎的現(xiàn)象。 
      在鋼化的冷卻工藝階段,由于玻璃是在鋼化爐的冷卻裝置中的輥道上做往復擺動,這時如果玻璃整體的急冷溫度過高,玻璃板面會產(chǎn)生波浪形彎曲,這主要是由于加熱爐溫度高而致,應及時降低爐溫及加熱時間。 
      當玻璃整體或局部溫度過低時,玻璃在鋼化的急冷和冷卻階段也會造成破碎。破碎后的玻璃碎屑會附著在輥道上,這時候我們必須及時清理輥道上的玻璃碎屑,嚴重時還要停爐進行清理維護。即便玻璃沒有破碎,鋼化后的玻璃也會出現(xiàn)玻璃碎片偏大、機械強度低和熱穩(wěn)定性差的現(xiàn)象,造成鋼化玻璃的質(zhì)量達不到國家標準的要求。 
      這種由于玻璃鋼化爐生產(chǎn)工藝控制不當造成的產(chǎn)品缺陷,將直接影響鋼化玻璃的產(chǎn)品質(zhì)量,影響產(chǎn)品的成品率,降低生產(chǎn)效率,造成工廠不必要損耗,增加生產(chǎn)成本。



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