空引きによる黄銅管の偏肉矯正機構

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Among various tubing materials, brass is the one widely used in industries, for curtain rail, sanitation tube, miscellaneous machine parts, antenna rod etc., for instance, owing to its high formability (for expanding, bending, drawing) and its easiness for plating. The customer's specifications for the finished tubings are recently becoming more and more rigorous, especially on the dimensional accuracy of the products, among which the wallthickness uniformity is of prime importance. However, no approaches for solving the problem of using brass tubings (other than copper tubings), seems to have been conducted. In the present study, the cause that gives rise to wallthickness scatters by brass-tube drawing and its correcting method are found out. 65/35 brass tubings were used in the experiments and the results have been summarized as follows. (1) After hollow-sinking the wall-thickness increased as dies taper at 6°, 13°and 20°and decreased as it at 30°. (2) The eccentricity could be diminished either by increasing or decreasing wall-thickness sinking. In the former case, the increasing of wall at the thinner part was more fast than other part, while in the latter case, the decreasing rate of wall was more fast at the thicker part. In this way, the thickness scatters in both cases are reduced. (3) In eccentric tubing, the eccentricity of the tube has the eccentricity more than 10% could be corrected to as low as 3% at 1 or 2 times sinking. But the eccentricity will slightly increase when the wall-thickness ratio (t/d) reached somewhere about 0.1. By further sinking the eccentricity can be corrected again to the final minimum value of about 3%. The phenomenon was most conspicuous when dies taper of 30°was used. The eccentric tubing of the eccentricity less than 10% could be corrected gradually through consecutive sinking about 3% of eccentricity.
東海大学の論文

空引きによる黄銅管の偏肉矯正機構

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