On the cut-off tuning test of aluminum bar

Abstract

Cut-off turning tests were conducted on aluminum round bar of 40mm in dia. under the following conditions; the number of revolution of the lathe was in the range of 500-1, 000r.p.m., the feed was in 0.06-0.16mm/rev., and the principal component of cutting oil used was kerosene or mineral oil. The cutting tool was made of high speed steel (SKH4) having rake angle of 26°; clearance angle of 6°, and cutting edge of 4mm.The main results obtained were as follows.(1) Between the both cases of using kerosene and mineral oil as cutting oils, a clear difference was observed in the relation between the tangential force and cutting depth of the tool. When mineral oil was used, tangential force gradually increased with the increase of cutting depth; while, in the case of kerosene, the increase of tangential force was much greater as compared with the former case, and the value showed a maximum in the middle point of the radius of round bar, and subsequently, decreased violently.(2) The tangential force was independent of cutting speed, but increased linearly with the advance of feed.(3) The thickness of chips was not uniform even when the turning was under constant feed; but it increased with the increase of cutting depth. The value showed a maximum at the cutting depth giving the maximum tangential force.(4) The chips tended to scratch the sides of neck, resulting the ruin of finished article. Then, the width of chips became smaller than that of tool. These tendencies were more remarkable when the feed was advanced, and were more remarkable in using kerosene than mineral oil.