Machining method of small-diameter efficient low-gram-weight internal thread copper pipe and copper pipe

• Main Authors: QIAO GAOPAN, YU CHAOJIE, HUANG HONGBING, MAO XIANGFEI
• Format: Patent
• Language: Chinese; English
• Published: 07.07.2023
• Subjects: AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL; MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PUNCHING METAL; TRANSPORTING

The invention discloses a machining method of a small-diameter efficient low-gram-weight internal thread copper pipe and the copper pipe. The machining method comprises the steps that a hard mother pipe is provided; softening the hard mother pipe to obtain a mother pipe; manufacturing a head at one end of the mother pipe; internal thread forming stretching is conducted on the mother pipe, and a formed copper pipe is obtained; the formed copper pipe is subjected to horizontal rewinding finishing and standing annealing in an annealing furnace, and a finished copper pipe is obtained; wherein the step of forming and stretching the internal thread comprises the substeps of first-time diameter reducing, second-time diameter reducing, spinning, diameter presetting and diameter fixing. The small-diameter efficient low-gram-weight internal threaded copper pipe is small in pipe diameter and light in gram weight per meter, and compared with a conventional 7 * 0.23 + 0.14 internal thread, under the unit gram weight per m