スチーフエル・マンネスマン式穿孔機による製管法の研究 (II) : ロール間隔及び芯金直徑の影響

概要

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By the actual use of the Stiefel-Mannesmann Piercing Mill, the authors studied the effects of both the gorge distance and the diameter of plug upon the state of piercing phenomenon from various points of view, The variations of the gorge distance and the diameter of plug were from 69mm to 79mm and 65mm to 75mm respectively, the diameter of billets being 90mm. The results obtained were summarized as follows : In case the gorge distance was decreased and the diameter of plug (i.e. the degree of deformation) increased, (1) The outside diameter of tube remained almost constant, but the thickness of tube increased linearly. (2) The twist of tube surface increased. (3) The power required increased : especially in case of higher degree of deformation, extraordinary power consumption was observed. (4) The axial moving speed of tubes during piercing dereased, but it increased at the latter stage of piercing owing to the elongation of tubes, and at the outlet of the mill it increased together with the degree of deformation. (5) The revolving speed of tubes during piercing decreased. (6) The reduction rate and speed in the piercing process increased. (7) The cracks that appeared on the inner surfaces of tubes increased when the round billets were good in quality. But no difference was appeared when the billets were of excellent quality.
社団法人日本鉄鋼協会の論文
1952-12-25