Abstract
The cutting mechanism of the alloy some non heat treatable free cutting aluminum alloys, has been investigated with a cutting state frozen equipment in order to consider the machinability. The machinability of each alloy has also been examined by the turning tests. Results obtained are as follows Al-Mn-Si alloys and Al-Mn-Mg alloys differ remarkably from each other in the shape of built-up-edge. The tool wear is influenced by compounds and precipitates in the alloy. Good chips disposal is obtained by addition of silicon and bismuth. Magnisum in the alloy has an effect of diminution of the cutting force and the cut surface roughness, especially at low cutting speed. The chips tend to become more segmental with increasing tool feed, while the cutting force and the cut surface roughness decrease with increase in cutting speed.
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