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如何避免玻璃在鋼化爐鋼化后產(chǎn)生的彩虹斑
來源:www.szkingly.com 發(fā)布時間:2013-10-21

      要避免和減輕原片玻璃在鋼化爐鋼化后產(chǎn)生的彩虹斑紋,可以通過對鋼化玻璃彩虹斑紋產(chǎn)生的原因進(jìn)行分析,在玻璃鋼化爐的加熱和吹風(fēng)冷卻工作過程中采取相應(yīng)的措施。
1、玻璃的加熱
      要想避免和減輕玻璃鋼化后的彩虹斑紋,玻璃在進(jìn)行風(fēng)冷前玻璃各個區(qū)域的溫度必須做到高度的均勻一致,否則玻璃溫度相對高區(qū)域所產(chǎn)生的內(nèi)部張應(yīng)力大,表面壓應(yīng)力較小,玻璃溫度相對低的區(qū)域所產(chǎn)生的內(nèi)部張應(yīng)力小,外部壓應(yīng)力較大,最終導(dǎo)致玻璃表面產(chǎn)生分布不均勻的應(yīng)力。玻璃加熱不均勻的主要因素是鋼化爐的加熱爐的各個區(qū)域的爐溫不一致。
      為了做到加熱爐內(nèi)溫度分布均勻一致,我們應(yīng)當(dāng)合理控制:(1)爐內(nèi)溫度設(shè)定。在設(shè)定加熱爐溫度時,要充分考慮爐體邊部的散熱情況,爐體邊部的溫度設(shè)置要略高于中部爐體的爐溫設(shè)置。另外,要保證爐體邊部的密封良好,同時保溫棉無出現(xiàn)破損現(xiàn)象;(2)要保證爐體內(nèi)溫度傳感器的準(zhǔn)確性。對于出現(xiàn)故障的溫度傳感器要及時進(jìn)行更換;(3)不能正常進(jìn)行加熱的加熱器(元件)及時進(jìn)行更換;(4)玻璃進(jìn)爐前合理的上片碼放,不能反復(fù)使用某一種碼放排列方法,這樣會導(dǎo)致該區(qū)域溫度低于長時間未碼放玻璃的區(qū)域;(5)加熱爐的爐絲布局對玻璃的均勻加熱也十分重要,建議選用矩陣式爐絲布局。
2  玻璃的吹風(fēng)冷卻
      加熱后的玻璃在進(jìn)行急冷吹風(fēng)時,由于吹風(fēng)冷卻的不均勻也會導(dǎo)致應(yīng)力的不均勻。冷卻強(qiáng)度越大,該區(qū)域玻璃表面的壓應(yīng)力就越大,這樣,冷卻強(qiáng)度相對較大的區(qū)域就會形成玻璃表面層壓應(yīng)力大,冷卻強(qiáng)度小的區(qū)域就會形成玻璃表面層的壓應(yīng)力小。
      為了避免由于吹風(fēng)冷卻過程而造成的應(yīng)力分布不均勻,我們須控制:(1)必須保證鋼化急冷段的風(fēng)柵所有吹風(fēng)孔無遮擋,完全通透;(2)上、下風(fēng)柵的導(dǎo)風(fēng)管保證無破損漏氣且無折皺,特別是下風(fēng)柵的導(dǎo)風(fēng)管,在進(jìn)行生產(chǎn)前要清理掉積壓在下風(fēng)柵導(dǎo)風(fēng)管上的碎玻璃渣;(3)保證風(fēng)冷段輥道所纏繞的芳綸繩間隙一致。加熱后在玻璃傳輸?shù)斤L(fēng)冷段時,風(fēng)冷段輥道也具有一定的導(dǎo)熱能力,玻璃與輥道接觸的部位被迅速冷卻,如果風(fēng)冷段輥道所纏繞的芳綸繩的間隙不一致,同樣會造成玻璃的冷卻不均勻;(4)風(fēng)冷段上、下風(fēng)柵風(fēng)眼孔徑的大小要一致,風(fēng)眼的孔壁表面要保證光潔,不能存在金屬毛刺。如果風(fēng)眼孔壁存在金屬毛刺很粗糙,吹出來的風(fēng)一定程度上會被阻滯,也會對玻璃的均勻冷卻產(chǎn)生影響。
      吹風(fēng)冷卻時玻璃的冷擺運(yùn)動。玻璃在鋼化爐的鋼化段進(jìn)行冷卻時,在理想條件下兩面冷卻是對稱進(jìn)行的,玻璃板面的冷卻速度與風(fēng)柵吹風(fēng)孔中心軸越近,冷卻的速度越快,其結(jié)果造成玻璃鋼化應(yīng)力分不均勻。提高玻璃與風(fēng)柵的相對運(yùn)動速度有利于玻璃的均勻冷卻,玻璃在吹風(fēng)冷卻時應(yīng)采用小擺幅高頻率的冷擺動。



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