- 學位論文
玻璃細孔磨削特性與表面裂痕之探討
Investigation of grinding characteristics and surface chipping on glass small-holes machining
摘要
本研究主要針對不易加工之玻璃材料，利用多結晶鑽石刀具(Polycrystalline diamond, PCD)配合高轉速主軸加工玻璃細孔，探討在不同轉速下玻璃細孔出入孔差及表面裂痕(chipping)的加工現象。本研究中以自行設計研發之微細切削加工機進行研究。此微細切削加工機是以PC-Base為控制單元，使用Borland C++ Bulider撰寫人機介面程式，搭載著高精度的平台、光學尺與伺服馬達，達到高精度的定位。在本文中分別用以不同轉速探討磨削玻璃細孔之加工現象。實驗結果顯示在相同的進給速率下主軸轉速越慢，玻璃表面裂痕較大；反之，當主軸轉速越高，玻璃表面裂痕較小。 本文提出使用自行研發伸縮式刀具進行玻璃細孔磨削加工，利用伸縮式刀具能有效能即時吸收刀具快速擠壓研磨液與刀具在出孔時所產生的軸向壓力。最後進行田口式實驗計畫，獲得最佳加工品質特性的參數，使用磨削轉速20000rpm，進給率1μm/sec、彈簧磅數5.443 和磨料濃度1：4可有效的降低出孔chipping的量，得到良好的出孔品質。
並列摘要
This study uses the cutting tools of Polycrystalline diamond with high speed spindle to fabricate small holes on glass. The machining phenomenon and parameters such as machining time, surface chipping, and feeding rate of the spindle were investigated. The experimental results show that the enlargement of entrance and exit of small holes and surface chipping of glass will become larger with reducing rotation speed of the spindle. On the contrary, with increasing the rotation speed of spindle, the enlargement of entrance and exit of small holes and surface chipping of the glass will become smaller. In order to improve the surface roughness and reduce chippings of the small holes, a new type of elastic-cutting tools equipped spring inside was developed to fabricate small holes on glass. The elastic-cutting tool could absorb the machining force by the inside spring while the tool penetrates the holes. The experimental results show that high quality of small holes machining on glass can be achieved by using the elastic-cutting tool with optimal machining conditions.