Aluminum Wire Manufacturing Rotational Compression
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Solution Overview
Problem
Aluminum wires are prone to breakage during production due to their low rupture strength and hardness compared to copper, leading to decreased operating efficiency in wire production.
Innovation Solution
A method for manufacturing aluminum wires involving a twisting step followed by rotational compression of outer-layer alloy wires in the same direction as twisting, along with specific alloy compositions and annealing processes to improve conductor resistance and strength, reducing the likelihood of breakage and enhancing production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If aluminum is used as conductor material to reduce weight, then fuel efficiency is improved, but the wire is prone to breakage during production due to low rupture strength and hardness
Solution Approach 1:
The patent uses composite material structure by combining aluminum conductor with aluminum oxide protective layer, and further composite by combining aluminum wire with copper-plated steel wire core. This provides both weight reduction benefits of aluminum and the strength/protection of composite structures, resolving the contradiction between lightweight and breakage resistance.
Solution Approach 2:
The patent changes the chemical composition parameters of the aluminum alloy (specific elements and their proportions) and the thickness of the aluminum oxide layer to optimize both the mechanical strength and electrical conductivity. By controlling alloy composition and oxide layer parameters, the wire achieves sufficient rupture strength while maintaining aluminum's lightweight advantage.
2Strength
If aluminum alloy composition is optimized to improve strength, then wire breakage resistance is improved, but conductor resistance may increase
Solution Approach 1:
The patent precisely controls the compositional parameters of the aluminum alloy (specific ranges of alloying elements) and the thickness of the aluminum oxide layer to achieve the optimal balance between strength and electrical conductivity. By adjusting these parameters, the material gains strength without excessive increase in resistance.
Solution Approach 2:
The aluminum oxide layer provides different properties at different locations: the core aluminum wire maintains high electrical conductivity for low resistance, while the surface oxide layer provides protection and strength enhancement. This local differentiation resolves the contradiction between strength and conductivity.
3Productivity
If outer-layer alloy wires are compressed to reduce friction, then operating efficiency is improved, but wire elongation decreases
Solution Approach 1:
The patent optimizes the compression parameters (pressure, duration, temperature) during the extrusion process to achieve sufficient friction reduction for efficient production while controlling the compression magnitude to preserve necessary wire elongation. By precisely controlling these parameters, both productivity and elongation are maintained.
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
The method reduces frictional forces and elongation loss, lowering the risk of wire breakage and improving operating efficiency in aluminum wire production by optimizing the twist pitch and alloy composition, while maintaining adequate conductor resistance and flexing properties.
Implementation Method 1
the force caused by the compression is released in the rotating direction, so that the frictional force is reduced
Implementation Method 2
an annealing step of annealing the alloy cast in the casting step at a temperature of 250° C. to 450° C.
Implementation Method 3
the magnesium dissolved in the alloy precipitates, whereby the conductor resistance is improved
Data Source
AI summary
A method for manufacturing an aluminum wire is provided. The aluminum wire includes an inner-layer conductor having one or a plurality of inner-layer alloy wires including aluminum and an outer-layer conductor having a plurality of outer-layer alloy wires including aluminum and provided on the inner-layer conductor. The method includes an outer-layer twisting step of twisting, over the inner-layer conductor, the outer-layer alloy wires provided on the inner-layer conductor, and an outer-layer rotational compression step of compressing the outer-layer alloy wires twisted in the outer-layer twisting step while being rotated in the same direction as the direction of the twisting in the outer-layer twisting step.