Cold Rolling Apparatus Meandering Correction and Edge Heating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cold rolling processes face challenges in stabilizing the overlapping length between the steel sheet edge and the induction heating device, leading to underheating or abnormal local heating, which results in steel-sheet fractures during the cold rolling of materials like silicon steel sheets, due to meandering movement and poor centering accuracy.
Innovation Solution
A cold rolling apparatus equipped with a meandering-movement correction device and a meandering-movement suppression device, which corrects the steel sheet's meandering movement before heating and suppresses movement during rolling, ensuring stable heating of the edge portions to a predetermined temperature using C-shaped inductors and a zigzag arrangement of roll bodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the steel sheet is cold-rolled at room temperature, then the rolling process is simple and cost-effective, but edge cracks occur in brittle materials like silicon steel sheets
Solution Approach 1:
The invention changes the temperature parameter of the steel sheet from room temperature to heated temperature (60°C or higher for silicon steel sheets). This parameter change transforms the material properties, making brittle materials like silicon steel sheets more ductile and preventing edge cracks during cold rolling, while still maintaining the simplicity of the cold rolling process
2Reliability
If the steel sheet temperature is increased to prevent edge cracks, then the material becomes more ductile, but the cost increases and handling becomes difficult
Solution Approach 1:
The invention applies local quality by heating only the edge portions of the steel sheet rather than the entire sheet. This localized heating approach prevents edge cracks in the critical edge regions while avoiding the high costs and handling difficulties associated with heating the whole steel sheet to high temperatures
3Reliability
If C-shaped inductors are used to heat edge portions by induction heating, then the edge temperature increases to prevent cracks, but meandering movement causes unstable overlapping length leading to underheating or abnormal local heating
Solution Approach 1:
The invention implements feedback control by using detection means to monitor the position of the steel sheet and the overlapping length between the inductor and steel sheet edge. Based on this feedback information, the system automatically adjusts the position of the inductor or the steel sheet to maintain the optimal overlapping length, ensuring stable and uniform heating while preventing underheating or abnormal local heating caused by meandering movement
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
The apparatus effectively reduces steel-sheet fractures by maintaining optimal overlapping lengths and temperatures, enhancing the stability and efficiency of the cold rolling process for materials like silicon steel sheets.
Implementation Method 1
a high frequency current is sent to the coil of the C-shaped inductor from a power unit to apply magnetic fluxes to the edge portions in the thickness direction of the steel sheet and generate an induced current in the edge portions, and the edge portions are heated with the Joule heat that occurs by the induced current
Implementation Method 2
the edge portions are heated with the Joule heat that occurs by the induced current
Data Source
AI summary
A cold rolling apparatus includes: a heating device configured to heat a sequentially transferred steel sheet; a cold rolling mill configured to sequentially cold-roll the steel sheet after being heated; a meandering-movement correction device arranged on an upstream side of the heating device in a transfer direction of the steel sheet, and configured to correct a meandering movement of the steel sheet transferred toward the heating device; and a meandering-movement suppression device arranged between the heating device and the cold rolling mill, and configured to suppress a meandering movement of the steel sheet attributed to the cold rolling of the steel sheet by using the cold rolling mill.