Continuous Steel Casting Soft Reduction Control
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Solution Overview
Problem
Existing continuous steel casting methods face challenges in determining optimal soft reduction conditions for varying strand thicknesses, leading to center segregation and internal cracks, as existing methods require time-consuming and costly experiments to adjust pressing rates.
Innovation Solution
A continuous steel casting method that determines pressing conditions based on specific relationships between strand thickness, reduction rate, and withdrawal speed, using expressions that account for strand width and thickness coefficients to ensure effective soft reduction and prevent center segregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If soft reduction pressing is applied to prevent center segregation, then steel quality is improved, but determining optimal pressing conditions becomes time-consuming and costly due to required experiments
Solution Approach 1:
The patent applies parameter changes by establishing mathematical relationships between pressing speed, strand thickness, and solidification shrinkage rate. Instead of determining optimal conditions through time-consuming experiments, the invention uses formulas where pressing speed is calculated based on strand thickness (D) and solidification shrinkage rate (ε), allowing rapid determination of pressing conditions for different thicknesses while effectively preventing center segregation
Solution Approach 2:
The patent replaces the mechanical trial-and-error approach with a theoretical calculation system. By substituting physical experiments with mathematical models that relate pressing force, strand dimensions, and solidification characteristics, the invention eliminates the need for repeated experimental adjustments while maintaining effective center segregation prevention
2Manufacturing precision
If soft reduction pressing is applied to prevent center segregation, then steel quality is improved, but the risk of causing internal cracks increases due to excessive pressing
Solution Approach 1:
The patent uses parameter changes to balance pressing intensity by calculating optimal pressing speed as a function of strand thickness and solidification shrinkage rate. The formula ensures pressing force remains within safe limits (preventing internal cracks) while being sufficient to prevent center segregation, adapting the pressing parameters dynamically to strand characteristics
Solution Approach 2:
The patent incorporates feedback mechanisms by continuously monitoring solidification progress and adjusting pressing speed accordingly. The pressing conditions are determined based on real-time strand thickness and solidification shrinkage rate measurements, allowing the system to respond to actual solidification state and prevent both under-pressing (center segregation) and over-pressing (internal cracks)
3Manufacturing precision
If multiple pressing rolls are arranged at solidification completion position to apply soft reduction, then center segregation is suppressed, but device complexity increases
Solution Approach 1:
The patent applies universality by designing pressing rolls that serve multiple functions: supporting the strand during withdrawal and simultaneously applying soft reduction pressing. The same rolling mechanism performs both support and pressing functions, eliminating the need for separate pressing devices and reducing overall system complexity while maintaining effective center segregation suppression
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 allows for rapid determination of optimal pressing conditions across different strand thicknesses, reducing center segregation and internal cracks, and enabling efficient production of steel products with varying specifications without significant time or cost.
Implementation Method 1
the unsolidified part of molten steel (referred to as 'unsolidified layer') is withdrawn in accordance with solidification shrinkage, whereby the unsolidified part of the molten steel flows in the direction of withdrawal of the strand
Implementation Method 2
a plurality of pairs of strand support rolls that apply pressing force to the strand
Data Source
AI summary
Conditions for soft reduction are determined in a method of continuous casting in accordance with a method utilizing the thickness of a slab strand to prevent center segregation from occurring in the strand due to an insufficient pressing rate or internal cracks from occurring in the strand due to an excessively high pressing rate.