Molten Metal Temperature Control via Spheroidization Distance
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Solution Overview
Problem
Direct measurement of viscosity and temperature of high-temperature molten metal alloys is challenging, leading to inaccuracies in manufacturing quenched ribbons for rare-earth magnets, as existing methods either introduce significant temperature measurement errors or fail to account for the relationship between viscosity and temperature.
Innovation Solution
A method that measures the spheroidization distance of molten metal droplets to indirectly specify the temperature of the molten metal, using pre-established correlation graphs between temperature, spheroidization distance, and pressure to maintain the molten metal within a predetermined temperature range for optimal quenched ribbon quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If infrared light detection is used to measure alloy temperature, then temperature measurement is enabled, but significant error between actual and measured temperature occurs
Solution Approach 1:
The patent uses spheroidization distance as an intermediary parameter to indirectly determine molten metal temperature. Instead of directly measuring temperature with infrared detection (which causes significant error), the method measures the distance the molten metal travels before spheroidizing, then refers to pre-established correlation graphs to specify the temperature. This intermediary measurement approach resolves the contradiction by providing reliable temperature specification without the measurement errors inherent in direct infrared temperature detection.
2Measurement precision
If direct measurement of viscosity and temperature is attempted, then measurement capability is achieved, but measurement accuracy deteriorates due to difficulty of direct measurement
Solution Approach 1:
The patent employs spheroidization distance as an intermediary parameter that is easier to measure accurately than direct viscosity and temperature of high-temperature molten metal. The measurement process involves capturing images of the discharged molten metal, calculating the distance from the nozzle to where spheroidization occurs, and then using pre-established correlation graphs to specify temperature and viscosity. This approach resolves the contradiction by transforming difficult direct measurements into easier indirect measurements through the intermediary spheroidization distance parameter.
Solution Approach 2:
The patent replaces direct physical measurement of temperature and viscosity (which is difficult at high temperatures) with optical imaging and image processing. By using a camera to capture images of the molten metal discharge and calculating spheroidization distance from these images, the method substitutes mechanical/thermal measurement systems with optical detection, thereby achieving accurate measurement without the difficulties of direct high-temperature measurement.
3Measurement precision
If spheroidization distance measurement is used to specify temperature, then temperature specification accuracy is improved, but device complexity increases due to correlation graphs and image processing
Solution Approach 1:
The patent performs preliminary work by establishing correlation graphs between spheroidization distance, temperature, and pressure before actual measurement and control operations. These pre-established graphs contain the relationship data needed to quickly specify temperature from spheroidization distance measurements. During operation, the system only needs to measure spheroidization distance and look up the corresponding temperature in the pre-prepared correlation graphs, avoiding complex real-time calculations. This preliminary action resolves the contradiction by moving computational complexity from the measurement phase to the preparation phase.
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 allows for accurate control of molten metal temperature without direct measurement, ensuring the production of high-quality quenched ribbons with desired crystal grain sizes and compositions by maintaining the molten metal within a specific temperature range.
Implementation Method 1
an imaging device is used to measure the spheroidization distance by obtaining images of the molten metal discharge
Implementation Method 2
the spheroidization distance traveled by a molten metal of an alloy discharged from a nozzle of a crucible from a nozzle tip to a position where the molten metal turns into droplets
Data Source
AI summary
A molten metal temperature control method includes: with respect to relations among a spheroidization distance traveled by a molten metal of an alloy from a nozzle tip to a position where the molten metal turns into droplets, the temperature of the molten metal inside the crucible, and a pressure acting on the molten metal inside the crucible, obtaining a relation between the temperature and the spheroidization distance at a predetermined pressure, and setting a predetermined temperature range of the temperature; measuring a spheroidization distance when discharging the molten metal from the crucible at the predetermined pressure, and specifying a temperature corresponding to the measured spheroidization distance; and comparing the specified temperature and the predetermined temperature range, and when the specified temperature is outside the predetermined temperature range, controlling the specified temperature so as to be within the predetermined temperature range by adjusting the temperature inside the crucible.