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发明公开
CN101720259A 无缝管的制造方法及孔型辊 无效 - 撤回

无缝管的制造方法及孔型辊
摘要：
本发明提供一种无缝管的制造方法及孔型辊。该无缝管的制造方法即使是在管的目标壁厚不同的情况下，也能够使用相同外径的芯棒，并且能有效地抑制管的周向的偏厚。该无缝管的制造方法的特征在于包括这样的工序，即，在延伸轧制后的管的目标壁厚(wt)存在多个的情况下，仅将多个轧制机中的配设于精轧机上的孔型辊(1)变更为满足下述式子(1)的条件、并针对每个目标壁厚具有不同的槽底曲率半径R1的孔型辊来对管进行延伸轧制。-0.1mm≤(1-cosθ)·S≤0.1mm...(1)；在此，在将配设于各轧制机的孔型辊的个数设为i(i＝2～4)的情况下，上述式子(1)中的θ以θ＝90/i(°)表示，S是指孔型辊的偏置量(mm)。
摘要（英）：

There is provided a method for manufacturing a seamless pipe or tube and a grooved roll with which, even when the target wall thickness of pipe or tube is different, a mandrel bar having the same outside diameter can be used, and the wall thickness eccentricity along the circumferential direction of the pipe or tube can be effectively suppressed. A method for manufacturing a seamless pipe or tube according to the present invention includes a step of drawing and rolling a pipe or tube wherein the step of drawing and rolling comprises, in a case where there exist a plurality of target wall thicknesses of pipe or tube after drawing and rolling, preliminary replacing only the grooved rolls disposed in the finishing stand among the plurality of rolling stands with grooved rolls each of which meets the requirement given by the following expression (1) and each of which has a groove bottom radius of curvature differently depending on a target wall thickness of pipe or tube after drawing and rolling, and drawing and rolling a pipe or tube by using the replaced grooved rolls, - 0.1 mm <= (1 - cos theta)*S <= 0.1 mm where theta is an angle expressed by theta = 90/i degrees if the number of grooved rolls disposed in each rolling stand is i (i = 2 to 4), and S is the offset amount (mm) for the grooved roll.

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