Method for machining large-caliber ultralong copper coil pipe

Abstract

The invention discloses a method for machining a large-caliber ultralong copper coil pipe. The method comprises the steps of 1, casting, wherein a copper-base alloy is molten and solidified to form asolid copper ingot; 2, extruding, wherein the copper ingot is extruded into a round pipe blank; 3, rolling, wherein the round pipe blank is rolled into a rolled blank pipe; 4, combined drawing, wherein a movable core mark procedure is adopted for drawing the rolled blank pipe four times, during each drawing, the drawing modular angle is set to be 30 degrees, the movable core mark angle is 22 degrees, after each drawing is completed, the rolled blank pipe is coiled through a coiling machine, when next drawing is carried out, the coiled rolled blank pipe is straightened through an uncoiler, thelast drawing is completed, and the finished pipe is formed; 5, annealing, wherein the finished pipe is annealed through a gas protection pass-type two-frequency annealing furnace in a passing-while-annealing manner, the annealing temperature ranges from 520 DEG C to 550 DEG C, and the passing speed of the finished pipe is smaller than or equal to 2 mm/min; and 6, winding, wherein the annealed finished pipe is wound. According to the method, the large-caliber ultralong copper coil pipe can be machined.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal processing, in particular to a processing method for a large-caliber super-long copper coil pipe. Background technique [0002] Nuclear Fusion-Artificial Sun is currently one of the largest and most far-reaching international scientific research cooperation projects in the world, involving more than a dozen countries including China, Germany, France, the United States, and Japan. In this project, it is necessary to apply a high-strength superconducting material product - copper coil. This product not only requires the material to have strong superconductivity (the resistivity is zero when the material is in the superconducting state), but also requires it to have a large diameter and large diameter. length specification. [0003] In the copper coil processing method, pipe drawing, finished pipe annealing and winding are essential. [0004] Regarding the pipe drawing process: In the tra...

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Problems solved by technology

[0004] Regarding the pipe drawing process: In the traditional pipe drawing process, if the straight drawing and fixed core rod drawing process is used, in this process, the design length of the core rod is the same as the length of the product. If the above-mentioned The length of the core rod must reach the same length as that of the ultra-long copper coil tube. Obviously, this drawing method cannot be realized; and when drawing with the swimming core head drawing die process, The current drawing of copper tubes with swimming cores can only be used for drawing copper tubes with an outer diameter of less than 35mm and a wall thickness of 0.3-3mm, which still cannot solve the problem of drawing large-diameter ultra-long copper coils.

[0005] Regarding the annealing and winding process of the finished tube: traditional annealing methods such as bell furnace, pit furnace, and roller hearth annealing. During annealing, the tube is placed in the furnace for annealing. Generally speaking, the length of the annealing furnace is 7 -8m, and the length of the copper coil is required to be very long. Therefore, the above-mentioned traditional annealing method cannot meet the annealing requirements of the ultra-long copper coil