Assembling method for NbTi multi-core superconducting ingot blank

Abstract

The invention discloses a composite assembling method for a multi-core superconducting ingot blank. The method comprises the following steps of cleaning a single core rod and an oxygen-free copper pipe, after cleaning the oxygen-free copper pipe, placing the cleaned oxygen-free copper pipe on a working platform, sleeving a head of an NbTi single-core rod with a copper pipe, carrying out rotary swaging of the head of the NbTi single-core rod by utilizing a rotary swaging machine, extending a traction tool out of the copper pipe, clamping a part of the head of the NbTi single-core rod sleeved with the copper pipe, starting the traction machine to pull out the NbTi single-core rod from the copper pipe, and carrying out overall rotary swaging to obtain the multi-core superconducting ingot blank. The assembling method is advantaged in that the traction tool can stably and reliably fix the NbTi hexagonal rod, labor intensity is reduced by utilizing the traction machine, in the penetrating process, stable, reliable and uniform force exertion is achieved, performance of the NbTi multi-core superconducting ingot blank is improved, the core breakage rate is lower than 0.5%, nonuniformity ofthe current-carrying performance of a wire in the length direction is reduced to 3% or below, the tensile strength is improved by 5%, and the method has wide applicability in the field of NbTi multi-core superconducting ingot blank assembling.

Description

technical field [0001] The invention belongs to the technical field of superconducting material processing, and relates to a method for composite assembly of multi-core superconducting ingots. Background technique [0002] The traditional preparation of NbTi / Cu superconducting wire is mainly the secondary assembly extrusion method, that is, the NbTi rod is combined with the copper matrix, and then extruded and drawn to form a single-core NbTi hexagonal rod, and then the NbTi hexagonal rod and the Cu hexagonal rod are bundled and placed Put it into the circular copper sheath, and use different specifications of circular copper rods to fill the gap between the hexagonal rod and the circular copper sheath, and compound to form a multi-core NbTi / Cu composite rod. The multi-core NbTi / Cu superconducting wire is made by extrusion and drawing. Although the technology of this preparation method is relatively mature, the work efficiency is low due to the many procedures. At the same ...

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Problems solved by technology

[0003] Aiming at the technical problem that it is very difficult to manually pass the NbTi hexagonal rod through the oxygen-free copper tube in the prior art, the present invention provides a method for assembling the NbTi multi-core superconducting ingot. The mandrel is pulled out from the copper tube for assembly, which solves the problem of difficulty, time-consuming, laborious and high loss of NbTi hexagonal rods passing through the oxygen-free copper tube, so that the NbTi hexagonal rod larger than 3m can easily pass through the oxygen-free copper tube, and the traction method adopted The tooling can accurately and reliably pull the NbTi hexagonal rod through the oxygen-free copper tube, fix it reliably and will not damage the NbTi hexagonal rod, and has wide applicability in the field of multi-core superconducting ingot assembly

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