繼目無し鋼管の壓延作業に關する研究 : プラツグミル用スタンゲンの強度について

概要

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When rolling seamless steel tubes by the use of Plug Rolling Mill, the authors measured both compression and bending forces acting upon Mandrel Bar of the mill, making use of Wire-Stain Gage. Through various data collected from practical operation of rolling tubes of 83mm. O.D., 3.7mm. thickness, and 7, 500mm. length, the following results have been obtained. (1) Compression force is, in many cases, more powerful than mandrel bar's buckling load of 1st order, and therefore it is necessary for us to be provided with guides. (2) Bending force is as powerful as compression force. (3) In one case of our experiments, the stress acting upon the bar has reached, at one time, 25kg/mm^2 max. In order to fight against such a high stress, it will be necessary for us to use materials of high yield point and regulate the tube temperature down to max. 300 deg. C under. (4) Compression force is greatly effected by both rolling temperature and the reduction of tubes. (5) From the calculations of buckling force under dynamical stress made by us, results which are, in general, in conformity with those of our experiments were obtained
社団法人日本鉄鋼協会の論文
1953-09-25