引抜き管の偏肉矯正機構

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The changes in the wall-thickness and eccentricity of P-deoxidized copper tubes in the process of sinking tubing in the die orifice have been investigated. Basing on the present experimental results together with the method of reducing eccentricity so far, the formular trying to predict the change of the wall-thickness by sinking has been introduced. The conclusions obtained are as follows; (1) even if the wall-thickness decreased after sinking, it invariably increased somewhere in the die orifice; (2) the eccentricity can be reduced only so long as the difference in the rate of wall-thickness change between thickest and thinnest wall exists; (3) the eccentricity is reduced not by the part of the working axial stress (δ_ι), but the hoop stress (δ_θ); (4) the wall-thickness after sinking (t"_<nc>) is expressed by the following formula, where t_n is the original thickness before sinking; t"_<nc>=t_n[1+(1+2δ_<θn>/Y´/1-δ_<θn>/Y´)((dr)/r)]×ξ
東海大学の論文