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2. 发明授权

US3678727A Stretch-draw tubing process 失效
标题翻译：拉伸管道工艺
公开(公告)号：US3678727A
公开(公告)日：1972-07-25
申请号：US3678727D
申请日：1970-08-27
申请人： ROBERT G JACKSON
发明人： JACKSON ROBERT G
IPC分类号： B21C1/22 , B21C37/06
CPC分类号： B21C1/22
摘要： Metallic tubing is drawn under tri-axial stress. A tube which has the capability of cold work is used as a starting material. The tube is stretched longitudinally under cold working conditions without restraint against reduction in diameter and in cross section into the plastic range but below the point of necking to reduce its diameter. Then the tube is drawn with tools which subject it to force inwardly on two axes at right angles to the longitudinal axis and at right angles to one another under cold working conditions into the plastic range. The cold worked condition of the tube is retained during the stretching and drawing.
摘要翻译：金属管在三轴向应力下拉伸。将具有冷加工能力的管用作原料。管子在冷加工条件下纵向拉伸，不受约束直径减小，而在横截面进入塑料范围但低于颈缩点以减小其直径。然后用工具拉制管子，该工具使其在两个轴线上向内受力，与纵向轴线成直角并且在冷作业条件下彼此成直角，进入塑料范围。在拉伸和拉伸过程中保持管的冷加工状态。

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