CVC Steckel Mill Rolling for High-Precision Medium-Thickness Plates
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Solution Overview
Problem
Traditional medium-thickness plate rolling mills face challenges in maintaining temperature stability and thickness precision during the rolling process, leading to significant thickness fluctuations and increased energy consumption, which affects the quality and efficiency of steel production for luxury cruise ships, high-strength steel, and engineering machinery.
Innovation Solution
A method and device utilizing a CVC steckel mill with optimized multi-pass rolling, controlled temperature, and axial movement of working rolls to achieve high thickness precision, involving heating, descaling, multi-pass flat rolling, linkage rolling, and laminar cooling, with automatic control programs to maintain precise rolling tension and temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional medium-thickness plate rolling mill is used, then production efficiency is improved, but thickness precision deteriorates with thickness fluctuation range of 0-1.2 mm
Solution Approach 1:
The patent applies dynamic control of working roll axial position through CVC (Controlled Variable Cross) technology, allowing the rolls to move axially during the rolling process to continuously adjust and compensate for thickness variations, thereby achieving high thickness precision (0-0.2mm) while maintaining efficient production
Solution Approach 2:
The patent changes multiple process parameters including rolling temperature (maintained at 850-950°C through coiler furnace), rolling speed, and working roll axial position to optimize both production efficiency and thickness precision. The coiler furnace temperature control and rolling parameter optimization enable stable production with reduced thickness fluctuation
2Productivity
If rolling passes are reduced to increase production efficiency, then productivity is improved, but temperature control precision deteriorates
Solution Approach 1:
The patent introduces a coiler furnace as an intermediary heating device between rolling passes to maintain steel plate temperature at 850-950°C. This mediator allows the steel to be reheated between passes, enabling fewer rolling passes while maintaining temperature control precision and improving overall production efficiency
3Manufacturing precision
If steel plate thickness is reduced to meet application requirements, then product quality is improved, but temperature drop rate increases
Solution Approach 1:
The patent implements continuous heating through the coiler furnace during the rolling process, maintaining uninterrupted thermal action on the steel plate. This continuous heating compensates for temperature drop that would otherwise occur during prolonged rolling of thin plates, enabling production of 4-8mm thick plates with uniform thickness and stable temperature
Solution Approach 2:
The patent applies preliminary heating in the coiler furnace before and during rolling to pre-compensate for temperature drop. By heating the steel plate in advance and maintaining temperature during rolling, the system prevents temperature drop before it significantly affects the rolling process, enabling production of thin plates with high thickness precision
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 method achieves a thickness tolerance of 0-0.2 mm, reducing weight by 3-9% and improving effective load, while enhancing the stability and efficiency of steel production, thereby meeting the requirements for luxury cruise ships and other applications.
Implementation Method 1
heating a blank in the heating furnace
Implementation Method 2
different working roll cooling water flow control is adopted
Implementation Method 3
working roll cooling water flow control
Implementation Method 4
controlling the temperature of the coiler furnace to a set value
Implementation Method 5
finishing the production process through the laminar cooling system
Data Source
AI summary
A method and a device for producing medium-thickness plates with high thickness precision through a CVC steckel mill. The method includes the following: heating a blank in the heating furnace, and roughly descaling by the descaling machine; enabling the blank to enter the rolling mill, after multi-pass flat rolling, carrying out multi-pass rolling, carrying out linkage rolling of the rolling mill and the coiler furnaces in the rolling process, and enabling the rolling tension to reach a set value; controlling the temperatures of the coiler furnace to a set value in the coiling process; and in the rolling process, starting 30-70% of the original flow of cooling water of the working roll of the rolling mill; and after rolling is finished, finishing the production process through the laminar cooling system and the hot straightening machine respectively.