Superconducting Wire Drawing With Trapezoidal Peripheral Wires
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Solution Overview
Problem
The wire drawing method for high-temperature superconducting wires results in non-uniform deformation and local stress concentration due to point contact between cylindrical metal tubes, leading to defects like disconnection and performance deterioration, as well as unstable compression and porosity distribution.
Innovation Solution
The method involves processing the peripheral wires into a substantially isosceles trapezoidal shape before wire drawing, ensuring uniform deformation and reducing the cross-sectional diameter by 35% or more, which stabilizes the contact state and reduces defects by using CAE to examine equivalent strain and average porosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cylindrical metal tubes are used for peripheral wires, then the wire structure is simple to manufacture, but local stress concentration and non-uniform deformation occur during wire drawing
Solution Approach 1:
The patent changes the cross-sectional shape of peripheral wires from circular to substantially isosceles trapezoidal. This asymmetric shape design ensures that during wire drawing, the peripheral wires maintain stable contact with both the central wire and outer shell, distributing stress uniformly and preventing local stress concentration and non-uniform deformation.
2Ease of manufacture
If cylindrical metal tubes are used for peripheral wires, then the manufacturing process is simple, but contact state between wires becomes unstable
Solution Approach 1:
The isosceles trapezoidal cross-sectional shape provides stable contact surfaces between peripheral wires, the central wire, and the outer shell during wire drawing. The geometry ensures consistent line contact rather than point contact, stabilizing the contact state throughout the drawing process.
3Productivity
If wire drawing reduces cross-sectional diameter by large amount, then productivity increases, but non-uniform deformation and defects increase
Solution Approach 1:
The patent implements preliminary shaping of peripheral wires into isosceles trapezoidal cross-sections before the wire drawing process. This preliminary action ensures that when large cross-sectional reduction is applied during drawing, the stress is uniformly distributed, preventing non-uniform deformation and defects while maintaining high productivity.
4Device complexity
If point contact between metal tubes is maintained, then device complexity is low, but local stress concentration causes disconnection and performance deterioration
Solution Approach 1:
The isosceles trapezoidal cross-sectional shape transforms the contact geometry from point contact to stable line contact between peripheral wires, the central wire, and outer shell. This geometric modification maintains structural simplicity while eliminating local stress concentration, preventing disconnection and performance deterioration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances processing stability, reduces disconnection, improves wire performance by maintaining average porosity below 30%, and lowers manufacturing costs by ensuring consistent shape and porosity distribution during the wire drawing process.
Implementation Method 1
compression of the material during the wire drawing becomes non-uniform
Implementation Method 2
non-uniform deformation and local stress concentration
Data Source
AI summary
In a wire drawing method, processing stability is ensured by preventing a shape from deforming non-uniformly. The wire drawing method includes: using a first wire that includes a center member, a plurality of first peripheral wires surrounding the center member, and an outer shell disposed outside the first peripheral wires; and reducing a cross-sectional diameter of the first wire by wire drawing. A shape of a cross section perpendicular to a longitudinal direction of the first peripheral wire is a substantially isosceles trapezoidal shape including a long side in contact with the outer shell, a short side in contact with the center member, and a first oblique side and a second oblique side that are in contact with the adjacent peripheral wires.