工學院: 機械工程學研究所指導教授: 蔡曜陽李光立Lee, Kuang-LiKuang-LiLee2017-03-132018-06-282017-03-132018-06-282015http://ntur.lib.ntu.edu.tw//handle/246246/278324由於纖維強化型複合材料具有非等向性與非均質性，故在銑削時其刀具壽命通常不高且當銑削溫度過高時基材樹脂會發生燒焦的問題，而其專用刀具單價較高使得加工的成本高昂。另外當刀具與加工條件選用不佳時會使得加工面上出現毛刺，而使得加工的程序中需要額外一道加工來去除此毛刺使得加工的成本與時間增加。為了提升加工時的刀具壽命及降低毛刺的發生，本研究中探討不同刀具與加工條件下對於刀具磨耗、溫度及毛刺的產生數量的影響。 本研究使用田口實驗設計法探討專門用於銑削纖維強化型複合材料的鳳梨型多刃銑刀在不同切削條件、鍍層及冷卻空氣溫度下對刀具壽命的影響，而在實驗中我們使用刀腹磨耗面積及面積對加工距離的增加率做為判斷刀具壽命的指標。實驗結果顯示，使用較低的轉速與進給率可使刀具壽命較長；PCD鍍層對於抵抗刀腹磨耗並增加刀具壽命有良好的效果，而低溫冷卻空氣雖然會加速PCD鍍層剝落使其壽命減少，但對於無鍍層刀具而言，使用低溫空氣冷卻補助銑削卻可以有效地降低刀腹磨耗提升刀具壽命。 為了能更明確地找出切削條件與刀具 特徵是如何影響刀具壽命、切削溫度與毛刺的產生，本研究中使用了五組單變數實驗探討在不同轉速、進給率、螺旋角、刀具刃數及在不同轉速下使用低溫冷卻空氣與否，對刀刃磨耗、切削面溫度及毛刺產生數量的影響，並搭配三軸力的量測來探討其原因。實驗結果顯示，較低的的主軸轉速與進給率會有較低的刀刃磨耗及切削溫度，但較低的轉速與較高的進給率會使得毛刺產生的數量增加；較小的螺旋角會有較低的刀刃磨耗、切削面溫度及較少的表面毛刺數量；較多的刃數會有較低的刀刃磨耗及較少的表面毛刺數量，但會使得切削面溫度較高。In milling glass fiber-reinforced compotsite material, the tool life of special milling tools generally not long and usually costs a lot in the whole precess, because the GFRP is a kind of anisotropic and non-homogenetiy material as well as when the milling temperature is too high, the matrix resin burnt problem occurs. Meanwhile, using wrong milling parameters might cause burrs happened on the cutting surface, it need extra time and process for removing these burrs. For improving tool life and red uce the incidence of these two kind of defects, in this study we disscuss different tool characteristics and milling parameters of effects on tool wear, cutting surface temperature and burrs. The main focus of the article is using Taguchi method to compare the tool wear under different cutting condition, coating and using different temperature of air, as well as we define the area of tool wear to be the tool-life index in this experiment. The results shows that PCD coating can dramatically improve tool life, and using low temperature air with PCD coating tool make tool life worse. However, in none coating tool low temperature air can considerablely reduce flank wear and increase tool life. In order to more clearly realize that how the cutting conditions and tool characteristics is affects tool life, cutting temperatures and surface burrs, this study used five groups univariate experiments for the different spindle speed, feedrate, helix angle, tool teeth and using different temperature air in two spindle speed. Produce a number of effects on the toolwear, the cutting surface temperature and quantity of burrs. meanwhile, measured three-axis force to understand the machanism. Experimental results show that the lower spindle speed and feedrate have a lower toowear area and cutting temperature, but lower speed and higher feed rate will cause an increasing of the quantity of burrs; Smaller helix angle have a lower wear of the tool edge, cutting temperature and the reduced quantity of burrs; More tool edge have a lower toolwear area and a reduced quantity of burrs, but will make the cutting surface temperature higher.11146375 bytesapplication/pdf論文公開時間: 2017/2/15論文使用權限: 同意有償授權(權利金給回饋學校)玻璃纖維強化複合材料鳳梨型多刃銑刀平頭端銑刀銑削溫度表面毛刺切削力GFRP(Glass Fiber-Reinforce Polymer) compositesMultitooth toolflate end milling toolMilling temperaturesurface burrcutting forcethesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/278324/1/ntu-104-R02522740-1.pdf