• 沒有找到結果。

火焰拋光玻璃術是一種污染較低的玻璃刮痕消除法。以火焰加熱火焰的方 式雖能很快地將玻璃刮痕消除,但加熱過程中若稍有不慎,很容易使玻璃破裂,

使實驗失敗。本研究對玻璃在加熱過程進行分析,並量測拋光後試片之內部應力 分佈。並對各實驗參數結果進行觀察後發現,現行之火焰拋光可針對以下幾點改 良:

1.針對火焰形狀之改良建議:

a.提高火焰之均勻性:若玻璃之寬度較小,則火焰之均勻性對玻璃在拋光 中破裂之影響性較小;而玻璃寬度增大時,火焰之均勻性則對玻璃之拋光 成功率有較大之影響。

b.以點熱源加熱玻璃時,不可由中間開始加熱,應在邊角處先加熱至玻璃 軟化,否則玻璃容易發生炸裂的現象。

2.針對火焰移動速度之改良建議:

a.火焰在玻璃前端時,以較慢之噴嘴移動速度拋光,可降低玻璃剛開始因 熱震而破裂機率。

b.火焰進入玻璃之1/5~1/4 後,可逐漸增加噴嘴移動速度。可以玻璃升溫達 到軟化點之上,減低玻璃破裂機率。

c.在拋光過程中,若玻璃長度較長時,噴嘴之移動速度應要由慢漸漸增快。

3.針對玻璃試片放置之建議:

a.由於試片在垂直放置之情況下,火焰分佈受重力之影響,不易得到一均 勻之火焰。而由 1.a 之改良建議中可知,火焰的均勻性愈好,拋光玻璃的 成功率會愈高,若能將玻璃以水平方式放置,可較容易得到一均勻之熱源。

4.本研究所使用之第一代火焰拋光機,所給予玻璃在拋光後的徐冷環境,是將玻 璃放置在空氣中,利用空氣的自然對流使玻璃慢慢冷卻。在此種徐冷狀態下,

常會在實驗後發現玻璃產生與拋光面傾斜一角度之裂紋;且通常此裂紋之破裂 速度較慢,甚至可用肉眼觀察其行進速度。研究後發現,此乃玻璃試片徐冷不 當所致。故設計下一代之玻璃火焰拋光機時,應在拋光機上加上徐冷裝置,使 玻璃的時間冷卻增長,即可減少此狀況發生。

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