METHOD OF MANUFACTURING SMALL-DIAMETER THIN-WALLED TUBE
PROBLEM TO BE SOLVED: To provide a method of manufacturing a small diameter thin-walled tube having no internal stripe flaws in a method of manufacturing a small-diameter thin-walled seamless steel tube by drawing a tube stock which is made by hot tube-making. SOLUTION: In the method of manufacturin...
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Zusammenfassung: | PROBLEM TO BE SOLVED: To provide a method of manufacturing a small diameter thin-walled tube having no internal stripe flaws in a method of manufacturing a small-diameter thin-walled seamless steel tube by drawing a tube stock which is made by hot tube-making. SOLUTION: In the method of manufacturing a seamless steel tube, the small-diameter thin-walled thickness tube is drawn by using a tapered die 1 including a taper-shaped approach part 1a and a bearing part 1b by which a drawing outside diameter is determined as a working die, and a plug 2 which is inserted into the inside of a tube 3 to be drawn while the diameter is reduced with the tapered die. In the method of manufacturing the small-diameter thin-walled thickness tube, a tapered die 1 having both the angles α of 15-20° of the approach part 1a is used. In this method of manufacturing the small-diameter thin-walled thickness tube, it is preferable to use a semi-floating plug 2 provided with a finishing part 2b for controlling the finished inside diameter of the tube and the tapered part 2a provided successively to the finishing part. COPYRIGHT: (C)2011,JPO&INPIT |
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