Dynamic Diffuser Positioning for Macrosegregation Control in Casting
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Solution Overview
Problem
The continuous casting process of metal often results in macrosegregation due to uneven temperature profiles and chemical composition variations across the cast part, leading to unsatisfactory properties and quality issues in metal ingots or billets.
Innovation Solution
A system and method for controlling the position of a spout tip or diffuser during the casting process, using a thermocouple to maintain the diffuser near the solidification front, where the liquid metal transitions to solid, by moving the mold frame or diffuser relative to each other via an actuator, ensuring optimal metal distribution and minimizing macrosegregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the diffuser is kept at a fixed position during casting, then the device complexity is reduced, but macrosegregation increases due to inability to adapt to changing solidification front position
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a fixed diffuser position to a dynamically adjustable position. The diffuser is coupled with an actuator that can change its position relative to the mold cavity based on real-time temperature feedback from thermocouples, allowing the system to adapt to the moving solidification front and maintain optimal metal distribution throughout the casting process.
Solution Approach 2:
The patent implements feedback control by using thermocouples to continuously monitor temperature at the solidification front and diffuser tip, then using this temperature data to control the actuator's movement. This closed-loop feedback system ensures the diffuser maintains the correct position relative to the solidification front, preventing macrosegregation while managing device complexity through intelligent control.
2Manufacturing precision
If the diffuser position is dynamically adjusted during casting, then macrosegregation is reduced, but the device complexity increases due to additional actuators and sensors
Solution Approach 1:
The patent applies universality by designing the actuator system to perform multiple functions: it not only positions the diffuser but also works in coordination with the mold frame movement. The same control system manages both the diffuser position and the relative positioning between mold and diffuser, reducing the need for separate dedicated mechanisms and thereby limiting the increase in device complexity.
3Manufacturing precision
If the diffuser is moved relative to the mold cavity, then the solidification front tracking is improved, but the stability of the casting process is reduced
Solution Approach 1:
The feedback principle is central to resolving this contradiction. Thermocouples provide continuous temperature monitoring at critical locations (solidification front and diffuser tip), and this real-time data feeds into the control system that adjusts the actuator position. This closed-loop control ensures that despite the dynamic movement, the diffuser maintains its correct position relative to the solidification front, achieving both accurate tracking and process stability through intelligent regulation.
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 reduces macrosegregation by maintaining the diffuser at the correct position relative to the solidification front, ensuring consistent metal composition and improved quality of the cast metal objects by controlling the flow of metal and adjusting positions based on temperature profiles and material properties.
Implementation Method 1
The at least one sensor may include a thermocouple disposed proximate the tip of the diffuser
Implementation Method 2
the actuator is configured to move at least one of the mold frame and the liquid diffuser relative to one another
Implementation Method 3
location of transition between liquid metal and solid metal in the cast part
Data Source
AI summary
Provided herein are an apparatus and method for continuous casting of metal, and more particularly, to an apparatus and method to reduce macrosegregation through a mechanism for controlling the position of a spout tip or diffuser during the casting process to maintain the spout tip or diffuser near the solidification front, location of transition between liquid metal and solid metal in the cast part. An apparatus may include: a mold frame supporting a mold defining a mold cavity; a liquid diffuser; and an actuator configured to move at least one of the mold frame and the liquid diffuser relative to one another, wherein the actuator is configured to move at least one of the mold frame and the liquid diffuser relative to one another in response to a signal from at least one sensor.