A study on the machinability of wrought aluminium alloy (3rd Report):On the machinability of 17S and 56S in the case of the high turning speed and the influence of the tool material on the machinability
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As shown in the previous report, the rods of wrought aluminium 17S-T4 and 56S-F were of lower machinability under a low cutting speed of 37-183m/min and so this time we put then under a high speed as far as 330m/min. and examined the turning machinability about the cutting resistance, the surface roughness, the chip treatment and so on. As the machinability is said to be affected by the materials or the figures of the used tool, authors examined a high speed steel one side tool, a carbon steel and tangalloy tools which have the same dimention, and discussed the influences of the figures of tools on the machinability changing dimentions of them.The results are summarized as follows:1. It is found that the cutting resistances under high speed turning are nearly equal to those of low speed turning as shown in previous report, and show nearly constant values according to the materials but regardless of the cutting speed. In this case, the cutting resistances of 17S is greater than those of 56S.2. According to the turning at a high speed, the good cutting surface near to the theoretical roughness of feed mark is obtained, even in the 17S and 56S which are not so easy to obtain the good surface by the turning at a low speed according to the plenty growth and dalling of built-up edge. The roughness of the cutting surface is improved rapidly with increase of the cutting speed, as far as critical speed of cutting, then arrives nearly constant roughness. It seems that the above mentioned critical speed of cutting may be a factor of machinability and, from this point of view, machinability of 17S is better than that of 56S.3. When both 17S and 56S are turned at a high speed, straight chips or ribbon-like chips are introduced continuously and wind round a part of the machine or the tool, on the other hand these chips sometimes leave a scar on a turned surface.4. The tangential force of the carbon steel tool is sleightly larger than that of the other two kinds of tools: the high speed steel and the tangalloy, whose tangential forces are not different. But it is observed that the traversing force of the tangalloy tool is very large especially when the side rake angle is small. But, in the chip treatment, the easily treatable chips may be obtained in using the tangalloy tool.5. The suitable edge angle of the end cutting is about 10°according to the cutting resistance and the surface roughness.6. On the tool tip figure, the cutting resistance of round nose is larger than that of broad nose, but about the cutting surface, the former is much better.This study owed its expenses to the Scholarship Commitee of the Institute of Light Metal Foundation to which we are extremely greatful.
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一般社団法人 軽金属学会 | 論文
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