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1. 发明授权

US3798943A Method and apparatus for cold-drawing metallic tubes 失效
标题翻译：用于冷轧金属管的方法和装置
公开(公告)号：US3798943A
公开(公告)日：1974-03-26
申请号：US26597072
申请日：1972-06-26
申请人： BENTELER WERKE AG
发明人： BENTELER H , HARTMANN F , HEFENDEHL H
IPC分类号： B21C1/24 , B21C3/14
CPC分类号： B21C1/24 , B21C3/14
摘要： Steel tubes are cold-drawn in a bench wherein the reducing die is located in front of a sleeve defining with the external surface of the tube to be cold-drawn an elongated tubular confining space which tapers toward the die at an angle of less than 3*. The space is filled with a lubricant at an elevated pressure of up to 100 atmospheres superatmospheric pressure, and such pressure rises automatically to a value exceeding at least 10 times the initial pressure when the tube is moved lengthwise at a speed of up to and in excess of 300 meters per minute. The rise in pressure of confined lubricant is due in part to friction between the lubricant and the external surface of the tube and suffices to insure that the moving tube remains out of mechanical contact with the die. A similar forwardly tapering confining space for reception of a pressurized lubricant can be provided between the internal surface of the tube and a confining member which is connected to and located behind a floating mandrel. The thus treated tube can be subjected to one or more additional cold-drawing treatments to reduce its outer diameter from 8-35 millimeters to about 3 millimeters and its wall thickness from about 3.5 millimeters to about 1 millimeter.
摘要翻译：将钢管冷却在工作台中，其中，还原模具位于限定管的外表面的套筒的前面，以冷拉，细长的管状封闭空间以小于3的角度朝向模具渐缩 DEG。该空间在高达100大气压超高压的高压下填充润滑剂，并且当管以高达和超过的速度纵向移动时，这种压力自动上升至超过初始压力的至少10倍的值每分钟300米。密封润滑剂的压力上升部分是由于润滑剂和管的外表面之间的摩擦，足以确保移动管保持与模具的机械接触。可以在管的内表面和连接到并位于浮动心轴后面的限制构件之间提供用于接收加压润滑剂的类似的向前渐缩的限制空间。如此处理的管可以进行一次或多次额外的冷拔处理，以将其外径从8-35毫米减小到约3毫米，其壁厚约为3.5毫米至约1毫米。

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