Production method for seamless metal tube

A 4-roll skew rolling mill, which is configured from large-diameter cone-type main rolls (1, 1') disposed either to the left and right of each other or above and below each other, so as to face each other with a pass line (X-X) therebetween, and small-diameter secondary rolls (7, 7') disposed between the facing main rolls, and either above and below each other or to the left and right of each other, so as to also face each other with the pass line therebetween, is used to bore and roll a solid billet such that the skew angle (beta) and the intersection angle (gamma) of the main rolls, and the skew angle ([beta]') and the intersection angle ([gamma]') of the secondary rolls are maintained within the ranges 5 degrees=

Keywords:

• Geometry
• Skew
• Metal
• Physics
• wall thickness
• rolling mill
• skew angle

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