A processing method of large-diameter super-long copper coil

Abstract

The invention discloses a processing method of a large-caliber super-long copper coil pipe. The first step is melting and casting, and the copper-based alloy is melted and solidified into a solid copper ingot; the second step is extruding, and the copper ingot is extruded into a round tube billet; Step 3 rolling, rolling the round tube billet into a rolled billet tube; Step 4 combined drawing, using the floating core process to draw the rolled billet tube in four passes, and in each pass of drawing, drawing The die angle is set to 30°, and the angle of the moving core head is 22°. After each drawing is completed, the rolled blank tube is coiled by a coiling machine. When entering the next drawing, after coiling The rolled blank tube is straightened by an uncoiler, and the final drawing is completed to form a finished tube; step five is annealed, and the finished tube is annealed in a gas-protected pass-through type two-frequency annealing furnace, and the annealing temperature is 520‑550°, the passing speed of the finished tube is ≤2mm / min; Step 6 winding, winding the annealed finished tube. This method can process large diameter super long copper coil pipe.

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...

AI Technical Summary

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