Cold-Rolled Steel Sheet Heating Profile for Brittle Fracture Control
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Solution Overview
Problem
Existing methods for cold-rolling silicon steel sheets with high Si content often result in brittle fractures, particularly at the central and edge portions, due to uneven temperature distribution, leading to inefficiencies and environmental concerns.
Innovation Solution
A manufacturing method and equipment utilizing a transverse-type full-width heating device to create a temperature gradient across the steel sheet, where the edge portions are heated to higher temperatures than the central portions, with specific temperature calculations based on Si content, to stabilize the rolling process and reduce environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire steel sheet is uniformly heated, then brittle fracture is controlled, but energy consumption increases and environmental load rises
Solution Approach 1:
The patent applies local quality by heating only the end portions of the steel sheet in the width direction to a higher temperature than the central portion. This creates a non-uniform temperature distribution where different regions have different temperatures optimized for their specific fracture risks. The end portions receive more heat to prevent edge fractures, while the central portion receives less heat to reduce overall energy consumption.
2Reliability
If heating temperature is increased, then fracture control improves, but environmental load increases
Solution Approach 1:
The patent optimizes the heating temperature parameters based on the Si content of the steel sheet. By using the formulas Te ≥ 0.1α^4.8 + 15 and Tc ≥ 0.1α^4.5 + 15, the heating temperature is precisely controlled at the minimum level needed to prevent fractures, avoiding excessive heating that would increase environmental load.
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 effectively controls brittle fractures and edge cracks, enabling stable cold-rolling of silicon steel sheets with minimal energy consumption and reduced environmental load, improving productivity and yield.
Implementation Method 1
heating the steel sheet by using the transverse-type full-width heating device in such a manner that temperatures of end portions in the width direction becomes higher than a temperature of a central portion in the width direction of the steel sheet
Data Source
AI summary
A manufacturing method of a cold-rolled steel sheet in which the method uses a transverse-type full-width heating device that heats a steel sheet over an entire area in a width direction of the steel sheet, and a cold rolling mill that rolls the steel sheet and that is arranged on a downstream side in a rolling direction with respect to the transverse-type full-width heating device, the method includes: heating the steel sheet by using the transverse-type full-width heating device in such a manner that temperatures of end portions in the width direction becomes higher than a temperature of a central portion in the width direction of the steel sheet on an entry side of the cold rolling mill.