Die-Casting Mold Cooling Aluminum Alloy Castings
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Solution Overview
Problem
Current methods for producing cast parts for electrical applications, such as aluminum alloys, are complex, time-consuming, and costly due to the need for multiple heat treatment processes and precise temperature control.
Innovation Solution
A die-casting method utilizing a mold with high thermal conductivity to achieve a cooling rate of at least 5×10^2 K/s, eliminating the need for additional heat treatment by forming a supersaturated mixed crystal structure, and using controlled piston speeds to minimize air inclusions and ensure complete mold filling with pressure compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional solution annealing and aging processes are used to produce high-strength aluminum alloys, then the mechanical strength is improved, but the production time and process complexity increase significantly
Solution Approach 1:
The patent combines the solution annealing, quenching, and aging processes into a single die-casting operation. The mold itself performs all three heat treatment functions sequentially: the hot mold wall (200-400°C) provides solution annealing during filling, the rapid cooling provides quenching, and the controlled cooling rate (5-500 K/s) during mold cooling provides aging. This eliminates the need for separate heat treatment furnaces and operations, reducing production time from hours to minutes while achieving the same mechanical strength properties.
Solution Approach 2:
The patent changes the cooling rate parameter from the traditional slow cooling in furnaces to rapid cooling (5-500 K/s) through the die-casting mold. This parameter change transforms the microstructure formation process, allowing Guinier-Preston zones to form during the rapid cooling phase rather than requiring separate aging heat treatment. The mold temperature (200-400°C) and cooling rate are optimized to achieve both high strength and electrical conductivity simultaneously.
2Strength
If complex heat treatment processes are applied to aluminum alloys, then the mechanical properties are improved, but the manufacturing cost increases
Solution Approach 1:
The patent merges multiple manufacturing operations (die-casting and heat treatment) into a single integrated process. The die-casting mold is designed to perform solution annealing, quenching, and aging functions, eliminating the need for separate heat treatment furnaces, handling operations, and energy consumption. This integration significantly reduces manufacturing cost while maintaining high mechanical strength properties.
Solution Approach 2:
The mold itself serves as the heat treatment medium, eliminating the need for external heat treatment equipment. The mold walls at 200-400°C provide the necessary thermal environment for solution annealing during filling, and the mold's thermal conductivity provides rapid quenching and controlled aging. This self-service approach reduces equipment investment and operational costs.
3Productivity
If rapid cooling is applied during die-casting, then the production efficiency is improved, but air inclusions and defects may increase
Solution Approach 1:
The patent optimizes the cooling rate parameter to a specific range (5-500 K/s) that balances rapid solidification with defect prevention. This controlled cooling rate allows sufficient time for air to escape during the filling phase while still achieving rapid enough cooling to form the desired microstructure and prevent excessive grain growth. The mold temperature (200-400°C) is also optimized to control the cooling rate and prevent thermal shock defects.
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 method produces high-strength, age-hardenable aluminum alloys efficiently and quickly, reducing process complexity and time while maintaining high electrical conductivity, suitable for electrical components like rotors and stators.
Implementation Method 1
the alloy melt is cooled during the die-casting process at a cooling rate of approximately ≧5×10^2 K/s
Implementation Method 2
forming a supersaturated mixed crystal structure
Implementation Method 3
the alloy melt in the die casting mold is still subjected to high pressure in order to compensate for the deficit of the lower density of the alloy melt compared to the solid state of the alloy and in this way to avoid cavities in the cast part
Data Source
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AI summary
The method comprises melting and filling a hardenable aluminum alloy into a die casting mold (4), and cooling the melted aluminum alloy (1) by the mold made of a material having a thermal conductivity causing the melted aluminum alloy to be cooled at a cooling rate >= 5x 10 2> K/s, where the melted aluminum alloy is introduced into a filling chamber (2) and is displaced at a minimal displacement speed within the filling chamber, prior to the filling step. The molten alloy is displaced at a low speed of less than 0.5 m/s in a filling chamber in the first phase. The method comprises melting and filling a hardenable aluminum alloy into a die casting mold (4), and cooling the melted aluminum alloy (1) by the mold made of a material having a thermal conductivity causing the melted aluminum alloy to be cooled at a cooling rate >= 5x 10 2> K/s, where the melted aluminum alloy is introduced into a filling chamber (2) and is displaced at a minimal displacement speed within the filling chamber, prior to the filling step. The molten alloy is displaced at a low speed of less than 0.5 m/s in a filling chamber in the first phase. The molten alloy is moved at high speed of 1-3 m/s from the filling chamber into the die-casting mold in a second phase. The molten alloy is set after complete filling of the die under pressure.