2233 鋼管の減径加工における曲がり発生メカニズム(S24-1 高機能・高付加価値の棒線管材の加工技術(1),S24 高機能・高付加価値の棒線管材の加工技術)

概要

論文の詳細を見る
Numerical investigation by axi-symmetric finite element analysis (FEA) and experimental investigation were carried out on the excessive decrease of outside diameter occurring on a tube and a bar cold-extruded through a die. The methanism through which excessive decrease of outside diameter appears was made clear by FEA, and the discrepancy between the die diameter and the outside diameter of extruded tube was quantitatively discussed. Throughout the course of this investigation, a peculiar phenomenon of bending was observed on the extruded tubes, and further investigation was carried out on the dominating parameter of this bending phenomenon. Eccentricity, i.e. non-uniformity of wall thickness in the cross section of tube or failure in concentricity between the circules of defining the outside and inside surfaces of parent tube, is the parameter which most influences the occurrence of bending phenomenon. Discussion and estimation was given of the mechanism through which this peculiar bending occured.
社団法人日本機械学会の論文
2005-09-18