熱固型碳纖維強化聚酯於被切削過程中，因刀具磨耗所造成之刀具前間隙面(flank face)磨損(VB=300 μm)與刀尖半徑逐漸圓角化(edge rounding)，剪切機制(shear criterion)逐漸弱化，而摩擦機制逐漸增強形成犁切加工。當剪切形成切屑之最小深度小於刀具加工深度時或刀尖半徑大於應力集中(Stress concentration)所需的最小半徑時，機制從剪力作工進入犁切與刨切之摩擦做功，因而劣化加工表面品質。本次實驗為使用適用於觀測犁切機制之磨耗設置，使用碳化鎢(cemented carbide)刀具對編織型碳纖維強化聚酯(carbon fiber reinforced plastics)進行正交犁切(orthogonal ploughing)磨耗測試。碳化鎢刀具圓角鈍化設定之刀尖半徑為69 μm，控制參數固定為切削速度(93.75 m/min)、進給率(0.016 mm/rev)。並在初始條件中加入預負載267.7 N，同時觀測在時間序列下之五個階段研磨磨耗試驗形成之演化結果，包含切削力與犁切力趨勢圖、刀具磨耗和刀尖半徑演化、前間隙面表面形貌並加以分析所加工之碳纖維強化聚酯表面之形貌。顯微組織影像則使用掃描式電子顯微鏡(SEM)進行擷取。當刀具持續磨耗(127.5 μm)後，前間隙面之粗糙度第一至五階段趨勢增加(Ra:0.9 μm-2.18 μm)與碳纖維強化聚酯加工面之粗糙度第一至三階段趨勢降低(0° Ra:1.91 μm-1.41μm, 90° Ra:1.68 μm-1.29 μm)，而後第四、五階段增加。刀具前間隙面粗糙度與刀尖處不平整,使摩擦與犁切機制影響增加，使加工面出現如溝槽(groove)及樹酯撕裂(cracking)等現象。

Tool wear contributed to flank face wear (VB=300 μm) and cutting edge rounded when processing carbon fibre reinforced plastics. In the condition, shear criterion progressively replaced by ploughing criterion forming ploughing mechanism. Cutting thickness for chip forming lower than minimum or cutting edge radius more than minimum of cutting thickness trigging stress concentration would exchange shear force for friction force of ploughing and rubbing mechanism to apply work.Seriously, processed surface of work piece became deteriorating compared to the one formed by shear criterion. In this study, equipment was wearing set up suitable for grinding experiment. Besides, using cemented carbide cutting tool to orthogonal cutting and ploughing carbon fiber reinforced plastics reached wear test. Cemented carbide cutting tool’s cutting edge radius was set at 69 μm to simulated tool already rounded due to wear. Machining parameters were fixed, including cutting speed (93.75 m/min), feed rate (0.016 mm/rev).Additionally, initial condition concluded preload (267.7 N).Meanwhile, observing five stages of grinding test was for getting result of processing revolution sequentially.Results included trend chart of cutting force and ploughing force, tool wear, revolution of cutting edge radius, Surface topography of cutting tool flank face and surface topography of carbon fiber reinforced plastics. Microscopic structure was presented by image captured by scanning electron microscope.During the stages of ploughing test, flank surface roughness trend is from 0.9 μm to 2.18 μm. Transverse direction of carbon fiber reinforced plastics ‘roughness trend from 1.91 μm to 1.41 μm in first to third stage, and then roughness increased. It was mean that processing procedure became unstable gradually. In other word, cutting tool slipped on carbon fiber reinforced plastics gradually unstably. Relatively, ploughing and rubbing criterion’s influence increased.

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