Abstract
玻璃纖維強化塑膠具有重量輕及高比強度的特性，自1960年代起就廣泛的應用於船體、建築及民生工業等。在纖維強化塑膠的二次加工中，鑽孔為相當重要的一環。而近年來高速主軸之發展已達實用階段，促使切削速率提高，以節省加工時間及提昇生產效率。因此高速鑽削纖維強化塑膠的結果如何，值得探討。目前關於高速鑽削纖維強化塑膠的研究相當稀少，陳奕光曾研究過高速鑽削碳纖維強化塑膠的刀具磨耗影響，其實驗結果顯示高轉速下鑽削碳纖維強化塑膠的刀具壽命極短。而在其他研究中指出，於一般切削速率下鑽削玻璃纖維的刀具壽命較鑽削探纖維強化塑膠者長。因此本研究主要針對高切削速率下鑽削玻璃纖維強化塑膠的結果，加以探討。吾人使用碳化鎢材質的多面鑽與麻花鑽分別以進給0.03、0.05、0.07 mm/rev，配合210、530、850m/min三種切削速率鑽削玻璃纖維強化塑膠薄板，並量測鑽削力訊號、鑽頭磨耗及孔品質。以探討刀具磨耗情形並討論刀具磨耗對鑽削過程及孔品質的影響。實驗結果顯示鑽頭的磨耗主要集中在鑽頭外緣，且磨耗沿著刀腹逐漸向軸心遞減，形成不均勻的刀腹磨耗。另外刀具磨耗會影響到刀具幾何、鑽削力大小及孔品質，且刀具磨耗量隨鑽削長度的變化趨勢與鑽削力的變化趨勢一致。Glass fiber reinforced plastic(GFRP) has the characteristics oflightness and high specific strength. It was broadly used inshipbody,architecture,industry and so on. Drilling plays animportant role in second tooling of FRP. Since the high speedspindle has been well developed, the cutting speed and theefficiency of production are increased and the machining timeis reduced. It earns to be studied what the result of drillingGFRP at high speed is. MFD(Multi-Face Drill)and twist drill oftungsten carbide are used to drill the GFRP plate, and thedrilling force, the tool wear and the characteristics of thedrilling hole are measured. It is shown that the tool wear ismainly concentrated in the outer region of the drill. The weardecade from the margin to the inner part of the drill along theflank. Besides, the tool wear influences the tool geometry, thedrilling force and the characteristics of the hole. The trendof the tool wear to the drill length is similar to the trend ofthe drilling force.