Method for performing surface peeling processing to superconducting composite bar

Abstract

The invention relates to a method for performing surface peeling processing to superconducting composite bar, which is characterized in that extruded bars are straightened on a linear broaching machine before peeling so as to ensure no eccentricity in the follow-up surface peeling process. A hard alloy peeling mould is adopted, the shape of the hard alloy peeling mould is a tapered structure and matched with a tapered hole of a broaching machine mould base, thereby guaranteeing concentricity in the peeling process, controlling cutting edge angles to be in a range of 10-15 degrees and controlling cutting edge length to be in a range of 1-3mm. The peeling amount for each time is controlled in a range of 0.1-0.5mm, thereby preventing overlarge peeling thickness from blocking a peeling mould inlet copper sheet and scratching the bar surface. Simultaneously, when matrix materials and superconducting materials in the superconducting composite bars are required to be adjusted according to design requirements of superconducting composite conductors, the purpose can be achieved by implementing the method.

Description

technical field [0001] The invention relates to a superconducting material processing technical field, and relates to a method for surface peeling processing of a superconducting composite rod by using a cemented carbide peeling die. Background technique [0002] Two low-temperature superconducting composite materials, NbTi / Cu and Nb3Sn / Cu, have excellent processing properties and can be prepared into kilometer-level or even 10,000-meter-level engineering practical materials. They have an irreplaceable position in the field of superconducting material engineering applications. In this preparation process, generally two or more materials and the outer matrix material (usually high-purity oxygen-free copper tube) are assembled into a composite ingot, and then the hot extrusion process makes the difference between different materials A good metallurgical bond can be achieved between them for subsequent processing. However, the hot extrusion process will inevitably form a serio...

AI Technical Summary

Problems solved by technology

The oxide layer and impurities on the surface of the superconducting composite rod must be removed before the subsequent cold drawing, otherwise it will cause serious disconnection, and it is impossible to obtain a kilometer-level or even a 10,000-meter-level long line that is practical for engineering

Usually, for extruded rods or pipes, pickling is mostly used to corrode and remove the oxide layer on the surface. Due to the surface oxide layer or extrusion lubricant and other impurity attachments at different positions, as well as factors such as acid solubility and temperature, etc. The influence of speed, in order to completely remove the oxide layer and impurities on the surface, we can only choose different corrosion degrees according to the surface conditions of each bar and often rework. The pickling process is difficult to control the uniformity of the corrosion thickness of the entire bar surface, and at the same time affects Control of Volume Ratio of Matrix Material and Superconducting Material in Superconducting Composite Materials

Pickled rods often have fine surface inclusions that need to be removed by manual grinding. The efficiency of the whole process is very low, and the production process causes environmental pollution.

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