Liquidus Tip Positioning in Continuous Casting via Impulse Detection
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Solution Overview
Problem
Existing methods for determining and adjusting the position of the sump tip in continuous casting of liquid metal, such as steel, are limited in precision and accuracy, particularly in distinguishing between partial solidification and complete solidification states.
Innovation Solution
The method involves adjusting the casting speed to determine the presence of a liquid core by applying impulses at specific locations along the strand guide, using a range of casting speeds (V1 and V2) to detect reactions in the bath level, and measuring force or displacement thresholds to precisely set the sump tip position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single casting speed is used to determine sump tip position, then the measurement is simple, but the precision of sump tip positioning is insufficient
Solution Approach 1:
The patent applies parameter changes by using multiple casting speeds (V1, V2, and VS) to determine sump tip position. By varying the casting speed parameter and observing the corresponding bath level reactions to impulses, the method achieves precise localization of the sump tip through the transition point where the liquid core disappears, thereby resolving the contradiction between measurement precision and process complexity.
Solution Approach 2:
The patent implements feedback by continuously monitoring the bath level reaction to impulses applied to the cast strand at different casting speeds. The feedback signal from the bath level sensor provides information about the solidification state, allowing the system to adjust and determine the sump tip position accurately by identifying the critical casting speed where the liquid core vanishes.
2Reliability
If constant casting parameters are used, then the process is simple to operate, but the ability to distinguish between partial solidification and complete solidification is limited
Solution Approach 1:
The patent applies dynamics by transitioning from constant casting parameters to dynamic parameter adjustment. The casting speed is varied between V1 (where no liquid core reaction occurs) and V2 (where liquid core reaction occurs), allowing the system to dynamically identify the sump tip position at the transition point, thereby improving solidification state detection reliability while maintaining operational feasibility.
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 precise adjustment of the sump tip by identifying the transition from solid to liquid states, enhancing the accuracy of sump tip positioning and reducing uncertainty in solidification assessments.
Implementation Method 1
the impulse then causes a local compression of the cast strand and thus a temporary shift in the liquid volume in the core
Implementation Method 2
the impulse leads to a displacement of the liquid volume
Implementation Method 3
the change being detectable by a suitable sensor device
Data Source
Figure 1
AI summary
The present invention relates to a method and an apparatus for setting the position of the liquidus tip in a cast strand to the level of a predefined location within a strand guide of a continuous casting installation. The method provides the repeated giving of a pulse to the cast strand at a fixedly predefined location within the strand guide at respectively changed casting speeds. During the repetitions, a first casting speed V1 is detected, at which the pulse which is given to the cast strand does not trigger a reaction at the bath level. And a second casting speed V2 is detected which is greater than the first speed and at which the pulse which is given to the cast strand triggers the reaction at the bath level. The setting of the liquidus tip in the cast strand approximately to the level of the fixedly predefined location of the pulse giving then takes place by casting of the cast strand at a speed VS, for which it holds that: V1 is smaller than VS is smaller than or equal to V2.