摘要
日本开发的高压气缸用ＥＲＷ钢管重要特性是内压疲劳，一般说这个特性与强度成比例，同时受残余应力的影响。现在汽缸用ＥＲＷ钢管，从尺寸精度来看，一般采用拔管加工，由于残余拉应力的发生而使疲劳极限降低。于是开发出在拔管时采用二段式顶头的拔管扩管法，其结果可以确保稳定残余压应力，内压疲劳极限在外径１０％、壁厚３２．７％的拔管＋０．５％扩管条件下提高１７％。
Development of Method of Pipe Expansion with Drawing for a Improvement of Fatigue Property under Internal Pressure The fatigue property under internal pressure is the most important property of ERW tube for high-pressure cylinders. Generally, this property is nearly proportional to the tensile strength of the tube so far as the tube is free from material defects and welding defects. However, this property is affected by the residual stress. In the production of ERW tubes for high-pressure cylinders, drawing is the most widely employed practice as it ensures high dimentional accuracy and permits the production of tubes of intermediate sizes. In this method, however, the fatigue limit is decreased because of the generation of residual tensile stress. To eliminate this drawing, a method of pipe expansion with drawing by the use of two-stage plug has been developed. The newly developed method ensures the residual compressive stress on a stable basis and improves the fatigue limit under internal pressure by 17% under the conditions of reducing the outside diameter and the wall thickness by 10% and 32.7%, respectively, with 5% pipe expansion.
出处
《焊管》
1997年第2期43-48,共6页
Welded Pipe and Tube
关键词
焊接钢管
疲劳
残余应力
冷拔
气缸
ERW钢管
welded pipe liner fatigue fatigue test residual stress cold drawing
