SiおよびCuを添加したA6061アルミニウム合金の旋削時における切りくずの表面形態から見た切りくず分断性(機械要素,潤滑,工作,生産管理など)

概要

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It has been reported that the chip breaking during lathe machining could be improved by the addition of Si and/or Cu in Al-1.0 mass%Mg-0.8 mass%Si alloy (A6061 alooy). To find out the information about the nucleation of chip-break and the mechanism of chip breaking, the surface morphology of chips was examined by using scanning electron microscopy for A6061, Si and Cu added A6061 (A6061+SiCu) and 99.7 mass%Al (A1070). Although the chip surface of A1070 was rather smooth, shear bands and micro-cracks were observed on the free surface and the side surface of chips, respectively, in both A6061 and A6061+SiCu alloys ; they may bring about the notch effect. Taking previous results on the microstructure of the alloys into consideration, the improvement of chip breaking during turning by the addition of Si and Cu was ascribed to more frequent crack formation due to the notch effect, and it was also ascribed to faster crack propagation due to increase in the number of inclusions and in the matrix hardness.
2005-01-25