Ultrasonic Energy Coupling Device for Molten Metal Grain Refining
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Solution Overview
Problem
Current methods for grain refining in metal casting, such as using chemical grain refiners, are limited in reducing grain size, introduce foreign particles leading to defects, and increase costs, while ultrasonic techniques have not been effectively applied for extended times or high-temperature grain refining in continuous casting processes.
Innovation Solution
An energy coupling device using a cavitation source with a probe in a cooling channel injects a cooling medium to couple vibrational energy into molten metal, suppressing columnar grain formation and achieving fine grain sizes without the need for chemical refiners, by applying ultrasonic or mechanically driven vibrations during the solidification process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chemical grain refiners are used to reduce grain size, then grain size is reduced, but foreign particles are introduced leading to defects and increased costs
Solution Approach 1:
The patent replaces chemical grain refiners with a mechanical vibration system. An ultrasonic transducer generates high-frequency vibrations that are transmitted through a horn into the molten metal, mechanically breaking up dendritic structures and promoting equiaxed grain formation without introducing foreign particles.
Solution Approach 2:
The patent applies mechanical vibration directly to the molten metal during solidification. The ultrasonic vibrations create cavitation and micro-streaming effects that disrupt columnar grain growth and promote uniform equiaxed grain structure, achieving grain refinement without chemical additives.
2Manufacturing precision
If ultrasonic techniques are applied for grain refining, then grain size is reduced, but application time and temperature range are limited
Solution Approach 1:
The patent implements continuous ultrasonic vibration treatment throughout the entire solidification process in the casting wheel. The ultrasonic transducer operates continuously as molten metal flows through the casting wheel, ensuring prolonged exposure to vibrational energy without interruption, thereby achieving effective grain refinement within the continuous casting timeline.
Solution Approach 2:
The patent modifies the operating parameters of the ultrasonic system to function at high temperatures. The ultrasonic transducer and horn are designed to withstand casting temperatures, and the vibration frequency and amplitude are optimized for high-temperature molten metal, expanding the applicable temperature range beyond conventional ultrasonic processing limits.
3Device complexity
If conventional casting methods are used, then process simplicity is maintained, but columnar grain formation occurs reducing mechanical properties
Solution Approach 1:
The patent introduces mechanical vibration into the conventional continuous casting process. The ultrasonic vibrations are applied to the molten metal as it solidifies in the casting wheel, transforming the grain structure from columnar to equiaxed, thereby improving mechanical properties while maintaining the overall simplicity of the continuous casting operation.
Solution Approach 2:
The patent utilizes the phase transition from liquid to solid during casting. By applying ultrasonic vibrations during the solidification phase transition, the patent modifies the crystallization process to produce equiaxed grains instead of columnar grains, improving mechanical properties without fundamentally changing the casting methodology.
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 enables the production of metal products with equiaxed grains of sub-micron size, reducing defects and costs, and improving mechanical properties by effectively refining grains in continuous casting processes.
Implementation Method 1
The probe under operation produces cavitations in the cooling medium. The cavitations are directed through the cooling medium to the receptor.
Implementation Method 2
The probe has at least one injection port for injection of a cooling medium between a bottom of the probe and the receptor. The probe under operation produces cavitations in the cooling medium.
Data Source
AI summary
An energy coupling device for coupling energy into molten metal. The energy coupling device includes a cavitation source which supplies energy through a cooling medium and through a receptor in contact with the molten metal. The cavitation source includes a probe disposed in a cooling channel. The probe has at least one injection port for injection of a cooling medium between a bottom of the probe and the receptor. The probe under operation produces cavitations in the cooling medium. The cavitations are directed through the cooling medium to the receptor.