Polygonal Al Alloy Wire Manufacturing Without Annealing
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Solution Overview
Problem
Current methods for increasing the transmission capacity of overhead power lines face challenges such as high heat generation leading to temperature rises, which deteriorate the power line characteristics, and require lengthy and costly annealing processes to enhance conductivity and high-temperature strength in aluminum alloy wires.
Innovation Solution
A method for manufacturing high-conductive polygonal shaped Al alloy wires without an annealing process, involving preheating an Al alloy rod with specific compositions of Fe and Si, conform-extruding it into polygonal shapes, and winding the resulting wire, which increases conductivity and reduces manufacturing time and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the transmission capacity of the power line is increased, then the transmission capacity is improved, but the temperature of the power line rises and characteristics deteriorate
Solution Approach 1:
The patent changes the physical parameters of the aluminum alloy wire by controlling the cooling rate during manufacturing. By using rapid cooling (quenching) instead of slow cooling, the wire achieves a refined grain structure that maintains strength at elevated temperatures, allowing higher transmission capacity without excessive temperature rise.
Solution Approach 2:
The patent uses composite aluminum alloy materials containing specific elements (Fe: 0.01-0.08%, Si with Fe:Si ratio of 2:3:1) to create a material that inherently resists thermal softening. The alloy composition is designed to maintain mechanical properties at high temperatures, enabling increased transmission capacity.
2Strength
If alloy elements are added to increase strength, then the strength is improved, but the conductivity becomes lowered
Solution Approach 1:
The patent optimizes the parameters of alloy element concentrations and their ratios. By precisely controlling Fe content (0.01-0.08%) and maintaining Fe:Si ratio of 2:3:1, the material achieves both high strength and high conductivity (63% IACS), resolving the trade-off between strength and conductivity.
Solution Approach 2:
The patent creates local microstructural features through controlled cooling that enhance strength without affecting overall conductivity. The rapid cooling process creates a refined grain structure and precipitate distribution that strengthens the material locally while maintaining good electrical conductivity throughout.
3Reliability
If the annealing process is conducted to enhance conductivity and high-temperature strength, then the conductivity and strength are improved, but the manufacturing time and cost increase
Solution Approach 1:
The patent extracts and eliminates the separate annealing process from the manufacturing sequence. By incorporating the necessary thermal treatment and microstructure development directly into the controlled cooling step, the material achieves both high conductivity (63% IACS) and high-temperature strength without requiring additional annealing operations, thereby reducing manufacturing time and cost.
Solution Approach 2:
The patent merges the cooling process with the microstructure development and property enhancement functions that would traditionally require separate annealing. The controlled rapid cooling simultaneously achieves grain refinement, precipitate formation, and desired mechanical properties, consolidating multiple process steps into one.
4Strength
If the cooling rate is increased to refine grain structure, then the high-temperature strength is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent employs self-service cooling mechanisms where the material's own thermal properties and the controlled environment enable rapid cooling without complex external cooling systems. The process utilizes the material's heat capacity and controlled heat dissipation to achieve the desired grain structure through relatively simple cooling arrangements.
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 achieves a conductivity of 63% IACS, enhances the space factor, and increases the transmission capacity of power lines while maintaining strength, reducing manufacturing time and costs, and improving durability and vibration fatigue limits.
Implementation Method 1
preheating an Al alloy rod with specific compositions of Fe and Si
Implementation Method 2
cooling the extruded Al alloy wire to room temperature
Data Source
AI summary
A method for manufacturing a high conductive Al alloy wire without conducting an annealing process includes: providing an Al alloy rod comprising 0.01 parts by weight to 0.08 parts by weight of Fe, Fe:Si=2 to 3:1 of Si and the balance Al and inevitable impurities, based on 100 parts by weight of an entire A1350 alloy; conform-extruding the Al alloy rod by passing through a dies of a conform extruder having a polygonal shaped structure to form a polygonal shaped Al alloy wire; cooling the extruded Al alloy wire to room temperature; and winding the cooled Al alloy wire using a winder.