| 摘要 |
PURPOSE:To form high quality tubes having no thickness deviation by maintaining respective specific relations of a skew roll outlet face angle, an angle of a plug reeling part, and a guide shoe outlet face angle to the path center of a rolled stock. CONSTITUTION:Angles of an outlet face 13 of skew rolls 1l, 1r a reeling part 22 of a plug 2, and a guide shoe outlet face respectively forming with the path center of a rolled stock are denoted by theta1, theta2 and theta3, respectively. Rolling is performed under conditions between theta1-theta3 such that -2<=theta2-theta1<=-0.5 deg. when 0 deg.<theta3<=1.5 deg., -1 deg.<theta2-theta1<=0 deg. when 1.5 deg.<=theta3<=3.0 deg., and 0<theta2-theta1<=1.0 deg. when 3.0 deg.<theta3<=5 deg.. Thus, the high quality tube having not thickness deviation is formed.
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