Hot Coil Rotation to Prevent Collapse During Phase Transformation
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Solution Overview
Problem
High-strength steel grades in metal strips undergo phase transformations during hot rolling and coiling, leading to unwanted volume changes and shape deviations, such as collapse and ovalization, which cause transportation and processing issues.
Innovation Solution
A method involving intermittent rotation of newly wound hot coils about their longitudinal axis, alternating between forward and reverse directions with intentional pauses, to counteract phase transformations and prevent shape changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-strength steel grades are produced, then material strength is improved, but phase transformation during coiling causes shape changes and collapse
Solution Approach 1:
The coil is rotated periodically at defined intervals (e.g., every 1-5 minutes) during transport to counteract delayed phase transformation. This periodic rotation redistributes the coil weight and prevents localized collapse and ovalization while maintaining the high-strength properties of the steel grade.
2Shape
If the coil is continuously rotated to prevent shape changes, then shape stability is improved, but transport time and energy consumption increase
Solution Approach 1:
Instead of continuous rotation, the coil is rotated periodically at optimized intervals (every 1-5 minutes). This periodic approach maintains shape stability by interrupting the phase transformation process at critical moments while minimizing unnecessary rotation time and energy consumption during transport.
3Shape
If the coil is rotated frequently to prevent collapse, then shape stability is improved, but mechanical wear on the coil surface increases
Solution Approach 1:
The rotation is applied partially rather than continuously - specifically every 1-5 minutes during transport. This partial action is sufficient to prevent collapse and ovalization by interrupting phase transformation at critical intervals, while avoiding excessive rotation that would cause unnecessary mechanical wear on the coil surface.
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 effectively prevents collapse and ovalization of metal coils by allowing phase transformations to occur in discrete steps, minimizing continuous shape changes and ensuring stable coil shape during transport and processing.
Implementation Method 1
a phase transformation of the steel product, for example from austenite to ferrite, can occur not only in a cooling section of a hot rolling mill but also—after the cooling section—in a coiler
Data Source
AI summary
The invention relates to a method for preventing shape changes in metal coils, in particular for preventing a collapsing of newly wound hot coils. In the method, a metal coil, in particular a newly wound hot coil, is rotated about its longitudinal axis intermittently in a first rotational direction and then rotated back in a second opposing rotational direction, or further rotated in the first rotational direction.