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題名 | A356鋁基碳化矽顆粒複合材料之切削性探討=A Study on the Machinability of A356/SiCp Composites |
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作 者 | 胡瑞峰; 蔡秉傑; 黃旭瑩; 謝楷模; | 書刊名 | 鑄造工程學刊 |
卷期 | 31:3=126 民94.09 |
頁次 | 頁19-37 |
分類號 | 472.5 |
關鍵詞 | A356鋁基碳化矽顆粒複合材料; 切削性; T6析岀硬化熱處理; 田口品質法; A356/SiCp composite; Machinability; T6 precipitation hardening heat treatment; Taguchi method; |
語文 | 中文(Chinese) |
中文摘要 | 本研究主要目的在探討不同碳化矽顆粒含量的A356鋁基碳化矽顆粒(A356/SiCp)複合材料之切削性,同時也對於T6析出硬化熱處理對其切削性之影響,進行探入之研究。 對於不同的切削參數如刀具種類、切削深度、進給率和切削速度等,本研究除以實驗分析其對A356/SiCp複合材料之切削性的影響外,亦利用田口品質法尋求各種不同成分A356/SiCp複合材料之最佳切削條件組合。切削性之評估係量測和比較不同切削條件下刀具的切削力、材料切削面的表面粗糙度和刀具的刀腹磨耗量,同時也利用顯微鏡深入觀察材料的切削表面、刀具的磨耗情形和切屑型態,以瞭解切削參數影響不同A356/Sicp複合材料切削性的機制。 研究結果顯示,隨著切削深度、進給率或切削速度之增加,刀具和材料內SiCp的磨擦會增加,因此增大刀具對材料的切削力。而在A356/SiCp複合材料中添加10wt.%以上的SiCp或施予T6熱處理後,不但材料硬度會提升,亦能有效改善材料切削面的表面粗糙度。其次,在刀具的刀腹磨耗方面,最大影響因素為刀具種類和SiCp添加量;即刀具的硬度越高,其刀腹磨耗量會明顯地降低,但若SiCp添加量增加,刀腹磨耗量則會增加。 此外,對於添加10wt.%SiCp以上的A356/SiCp複合材料,建議以CBN刀具進行切削,即可獲得較佳的切削表面粗糙度和較小的刀腹磨耗量,但對於添加5wt.%SiCp以下的A356/SiCp複合材料,則建議使用鍍TiC刀就足夠有較佳的切削效果。而以田口品質法所尋獲各種A356/SiCp複合材料之最佳切削參數組合,其重現性則甚性。 |
英文摘要 | The aims of this study are to investigate the machinability of the different A356/silicon carbide particulate (SiCp) composites by experiments, and the Taguchi method was conducted to analyze the optimum cutting conditions for the different A356/SiCp composites. By the experiments, the relationship between the cutting characteristics of A356/SiCp composites and the various cutting parameters was acquired. The tested specimens are heat-treated by the T6 precipitation hardening heat treatment or not. The contents of SiCp added into the composites are 5wt.%, 10wt.% and 20wt.%. The cutting parameters studied comprise tool type, depth of cut, feed rate and cutting speed. The machinability of A356/SiCp composites which was evaluated in this study includes cutting force of tool, surface roughness of machined surface and flank wear of tool. In addition, the microstructures of worn surfaces of tool, machined surfaces and chips of the A356/SiCp composites are thoroughly observed by SEM and measuring microscope to understand the mechanism of effect for different cutting condition. The experimental results show that the cutting force is increased with increasing depth of cut, feed rate or cutting speed, since the friction induced between tool and SiCp is enlarged. In addition, the A356/SiCp composites were added beyond 10wt.% SiCp, or treated by T6 heat treatment, the surface roughness of machined surface as well as the hardness of A356/SiCp composites can be improved. The amount of flank wear of tools will be significantly reduced with increasing the hardness of tool, but will be increased with increasing the SiCp contents of A356/SiCp composites. However, the hardness of tool is closely related to the type and constituent of tool. Owing to the better surface roughness produced on machined surface and the less amount of flank wear of tool obtained, the cubic boron nitride (CBN) tool was suggested to cut the A356/SiCp composites with SiCp content added over 10wt.%. Conversely, for the A356/SiCp composites with SiCp content less then 5wt.%, the TiC-coated tool was suggested to get better cutting qualities of composites. The optimum combination of cutting parameters for diffeerent A356/SiCp composites sought by the Taguchi method revealed the better reproducibility. |
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