彎型(xing)鋼化(hua)玻璃(li)發生平整度不(bu)好的問題時，會出現(xian)(xian)三種不(bu)良(liang)現(xian)(xian)象。今天(tian)長沙鋼化(hua)玻璃(li)專家來為(wei)大家介紹，平型(xing)鋼化(hua)玻璃(li)出現(xian)(xian)平整度不(bu)好的兩種不(bu)良(liang)現(xian)(xian)象。

1、玻(bo)璃在加(jia)熱(re)時上下表面存在溫(wen)差造(zao)成(cheng)的玻(bo)璃變形(xing)

（1）鋼(gang)化玻(bo)璃(li)板面(mian)(mian)(mian)向上(shang)(shang)彎(wan)曲(qu)。這(zhe)種現(xian)象是由于(yu)(yu)玻(bo)璃(li)在(zai)加(jia)熱(re)爐(lu)內被加(jia)熱(re)后，出現(xian)玻(bo)璃(li)上(shang)(shang)表(biao)面(mian)(mian)(mian)的溫(wen)(wen)(wen)度(du)高于(yu)(yu)下表(biao)面(mian)(mian)(mian)的溫(wen)(wen)(wen)度(du)的情況，保持這(zhe)種溫(wen)(wen)(wen)度(du)狀(zhuang)態的玻(bo)璃(li)進入(ru)冷(leng)卻室冷(leng)卻，在(zai)冷(leng)卻過(guo)程中，當玻(bo)璃(li)上(shang)(shang)下表(biao)面(mian)(mian)(mian)的冷(leng)卻溫(wen)(wen)(wen)度(du)和風(feng)壓等條件相(xiang)同(tong)時，由于(yu)(yu)玻(bo)璃(li)上(shang)(shang)表(biao)面(mian)(mian)(mian)溫(wen)(wen)(wen)度(du)高，冷(leng)卻后上(shang)(shang)表(biao)面(mian)(mian)(mian)的收(shou)縮量大(da)于(yu)(yu)下表(biao)面(mian)(mian)(mian)，會出現(xian)玻(bo)璃(li)板面(mian)(mian)(mian)向上(shang)(shang)彎(wan)曲(qu)變形的現(xian)象。出現(xian)這(zhe)種情況，可(ke)以(yi)將加(jia)熱(re)爐(lu)底(di)部的溫(wen)(wen)(wen)度(du)提(ti)高，盡(jin)量減小玻(bo)璃(li)上(shang)(shang)下表(biao)面(mian)(mian)(mian)的溫(wen)(wen)(wen)度(du)差。

（2）鋼(gang)化(hua)玻(bo)(bo)(bo)璃板面向(xiang)下(xia)彎(wan)曲。這種現(xian)(xian)(xian)象是(shi)由于玻(bo)(bo)(bo)璃在加(jia)熱爐內(nei)被加(jia)熱后，出(chu)現(xian)(xian)(xian)玻(bo)(bo)(bo)璃下(xia)表面的(de)溫(wen)度高(gao)于上(shang)表面的(de)溫(wen)度的(de)情(qing)(qing)況，保持這種溫(wen)度狀態的(de)玻(bo)(bo)(bo)璃進(jin)入冷(leng)(leng)(leng)卻室冷(leng)(leng)(leng)卻，在冷(leng)(leng)(leng)卻過程中(zhong)，當玻(bo)(bo)(bo)璃上(shang)下(xia)表面的(de)冷(leng)(leng)(leng)卻溫(wen)度和風壓等(deng)條件(jian)相同時，由于玻(bo)(bo)(bo)璃下(xia)表面溫(wen)度高(gao)，冷(leng)(leng)(leng)卻后下(xia)表面的(de)收縮量(liang)大于上(shang)表面，會出(chu)現(xian)(xian)(xian)玻(bo)(bo)(bo)璃板面向(xiang)下(xia)彎(wan)曲變(bian)形的(de)現(xian)(xian)(xian)象。出(chu)現(xian)(xian)(xian)這種情(qing)(qing)況，可(ke)以將加(jia)熱爐底部的(de)溫(wen)度降低，盡(jin)量(liang)減(jian)小玻(bo)(bo)(bo)璃上(shang)下(xia)表面的(de)溫(wen)度差。

2、玻(bo)璃在加(jia)熱時中間和邊部(bu)存在溫差(cha)造成的玻(bo)璃變(bian)形(xing)

玻(bo)(bo)璃(li)(li)在(zai)加(jia)熱爐(lu)內經過(guo)加(jia)熱后(hou)，如果(guo)其(qi)中(zhong)(zhong)間(jian)(jian)部(bu)(bu)(bu)位的(de)(de)(de)(de)溫(wen)(wen)度(du)(du)(du)高(gao)于邊(bian)(bian)部(bu)(bu)(bu)的(de)(de)(de)(de)溫(wen)(wen)度(du)(du)(du)，那(nei)么在(zai)冷(leng)(leng)卻過(guo)程中(zhong)(zhong)，玻(bo)(bo)璃(li)(li)上溫(wen)(wen)度(du)(du)(du)較高(gao)的(de)(de)(de)(de)中(zhong)(zhong)間(jian)(jian)部(bu)(bu)(bu)位的(de)(de)(de)(de)收(shou)(shou)縮(suo)(suo)量(liang)(liang)，將大(da)(da)于溫(wen)(wen)度(du)(du)(du)較低(di)的(de)(de)(de)(de)邊(bian)(bian)部(bu)(bu)(bu)的(de)(de)(de)(de)收(shou)(shou)縮(suo)(suo)量(liang)(liang)，當(dang)玻(bo)(bo)璃(li)(li)被冷(leng)(leng)卻到室溫(wen)(wen)狀(zhuang)態(tai)(tai)時，玻(bo)(bo)璃(li)(li)的(de)(de)(de)(de)邊(bian)(bian)部(bu)(bu)(bu)尺寸就(jiu)會(hui)(hui)大(da)(da)于中(zhong)(zhong)間(jian)(jian)部(bu)(bu)(bu)位的(de)(de)(de)(de)尺寸，在(zai)玻(bo)(bo)璃(li)(li)的(de)(de)(de)(de)邊(bian)(bian)部(bu)(bu)(bu)形(xing)成較大(da)(da)的(de)(de)(de)(de)壓應力，從而(er)出(chu)現玻(bo)(bo)璃(li)(li)板面(mian)向下彎曲變形(xing)的(de)(de)(de)(de)現象。同樣，玻(bo)(bo)璃(li)(li)在(zai)加(jia)熱爐(lu)內經過(guo)加(jia)熱后(hou)，如果(guo)其(qi)邊(bian)(bian)部(bu)(bu)(bu)的(de)(de)(de)(de)溫(wen)(wen)度(du)(du)(du)高(gao)于中(zhong)(zhong)間(jian)(jian)部(bu)(bu)(bu)位的(de)(de)(de)(de)溫(wen)(wen)度(du)(du)(du)，那(nei)么在(zai)冷(leng)(leng)卻過(guo)程中(zhong)(zhong)，玻(bo)(bo)璃(li)(li)上溫(wen)(wen)度(du)(du)(du)較高(gao)的(de)(de)(de)(de)中(zhong)(zhong)間(jian)(jian)部(bu)(bu)(bu)位的(de)(de)(de)(de)收(shou)(shou)縮(suo)(suo)量(liang)(liang)將大(da)(da)于溫(wen)(wen)度(du)(du)(du)較低(di)的(de)(de)(de)(de)邊(bian)(bian)部(bu)(bu)(bu)的(de)(de)(de)(de)收(shou)(shou)縮(suo)(suo)量(liang)(liang)，當(dang)玻(bo)(bo)璃(li)(li)被冷(leng)(leng)卻到室溫(wen)(wen)狀(zhuang)態(tai)(tai)時，玻(bo)(bo)璃(li)(li)中(zhong)(zhong)間(jian)(jian)部(bu)(bu)(bu)位的(de)(de)(de)(de)尺寸就(jiu)會(hui)(hui)大(da)(da)于邊(bian)(bian)部(bu)(bu)(bu)的(de)(de)(de)(de)尺寸，在(zai)玻(bo)(bo)璃(li)(li)的(de)(de)(de)(de)邊(bian)(bian)部(bu)(bu)(bu)形(xing)成較大(da)(da)的(de)(de)(de)(de)張應力，從而(er)出(chu)現玻(bo)(bo)璃(li)(li)板面(mian)向上彎曲變形(xing)的(de)(de)(de)(de)現象。