Steel Sheet Shape Control for Uniform Coating Thickness
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Summary
Problems
Existing methods for uniformizing coating thickness on steel sheets in continuous hot-dip metal coating processes face challenges such as warp and vibration issues, which lead to non-uniform coating thickness in both transverse and longitudinal directions, and are limited in suppressing high-frequency vibrations using electromagnetic correction technologies.
Innovation solutions
A steel sheet shape control method and apparatus that employs a series of electromagnets and sensors to apply electromagnetic forces, perform numerical analyses, and adjust control gains to correct the shape of the steel sheet in the transverse direction, setting target correction shapes to curved forms to increase rigidity and suppress vibrations, ensuring uniform coating thickness.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If electromagnetic correction is used to correct steel sheet warp, then coating thickness uniformity is improved, but high-frequency vibrations cannot be sufficiently suppressed
Why choose this principle:
The steel sheet shape control system is divided into multiple independent electromagnet units arranged along the transverse direction, with each electromagnet capable of independent control. This segmentation allows targeted correction of different warp and vibration patterns across the steel sheet width, enabling effective suppression of high-frequency vibrations that affect coating uniformity.
Principle concept:
If electromagnetic correction is used to correct steel sheet warp, then coating thickness uniformity is improved, but high-frequency vibrations cannot be sufficiently suppressed
Why choose this principle:
The electromagnet control system dynamically adjusts the magnetic field strength and timing based on real-time steel sheet position and shape measurements. By varying the electromagnetic force dynamically during the steel sheet passage, the system can suppress high-frequency vibrations and adapt to changing warp conditions, improving both vibration suppression and coating uniformity.
Application Domain
Data Source
AI summary:
A steel sheet shape control method and apparatus that employs a series of electromagnets and sensors to apply electromagnetic forces, perform numerical analyses, and adjust control gains to correct the shape of the steel sheet in the transverse direction, setting target correction shapes to curved forms to increase rigidity and suppress vibrations, ensuring uniform coating thickness.
Abstract
A steel sheet shape control method includes, (A) setting a target correction shape of the steel sheet at a position of an electromagnet to a curved shape, (B) measuring a steel sheet shape when electromagnetic correction is performed, (C) calculating the steel sheet shape in a nozzle position based on the steel sheet shape, (D) repeating (B) and (C) by resetting the target correction shape to a curved shape having a smaller amount of warp, (E) when the amount of warp of the steel sheet shape at the position of the nozzle is less than the upper limit value, (F) calculating vibration of the steel sheet at the position of the nozzle, and (G) adjusting a control gain of the electromagnet until amplitude of vibration is less than a second upper limit value when the amplitude of the vibration is equal to or more than the second upper limit value.