Hot Rolling Mill Using One Stand Type for Single-Heat Plate Reduction
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Solution Overview
Problem
The existing methods for hot rolling metal stock require high investment costs, significant maintenance efforts, and high energy consumption due to the need for multiple rolling devices and frequent heating of the rolling stock to maintain the desired temperature window for shaping heavy plates with large initial thicknesses.
Innovation Solution
A method that uses a single type of rolling device with a high roll rise and work roll axial displacement and bending capabilities to achieve thickness reduction from a large initial cross-section to a target cross-section in a single heat, reducing the number of rolling devices and eliminating the need for intermediate heating by using a roll stand with a maximum roll rise of at least 900 mm and a degree of deformation between 2 and 5.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple rolling devices with different types of rolling stands are used to process heavy plates with large initial thicknesses, then the desired thickness reduction and flatness can be achieved, but investment costs and device complexity increase significantly
Solution Approach 1:
The patent applies a single universal rolling stand type that can perform both roughing and finishing operations. The rolling stand is designed with high roll rise capability (at least 900 mm) and work roll bending/shifting systems, enabling it to handle both large initial thickness reductions and final precision rolling in one device, eliminating the need for separate roughing and finishing stands
Solution Approach 2:
The patent merges the functions of multiple specialized rolling stands (roughing stands and finishing stands) into a single rolling stand type. By combining the capabilities of handling large cross-sections with achieving precise thickness tolerances in one device, the system reduces the total number of rolling devices required while maintaining product quality
2Productivity
If multiple rolling devices with different rolling stand types are used, then the required thickness reduction capability is achieved, but maintenance and repair expenditures increase
Solution Approach 1:
By designing a universal rolling stand that can perform all rolling operations from roughing to finishing, the patent ensures that only one type of rolling device needs to be maintained and repaired. This standardization reduces maintenance complexity and expenditures compared to maintaining multiple different types of specialized rolling stands
3Temperature
If the rolling stock is temporarily heated multiple times to maintain the desired temperature range during rolling, then the forming process can proceed, but energy consumption and CO2 emissions increase
Solution Approach 1:
The patent enables continuous rolling operations without intermediate heating by using a single rolling stand with sufficient roll rise capability to achieve the complete thickness reduction in one pass sequence. This eliminates the need for temporary heating between roughing and finishing stands, reducing energy consumption and CO2 emissions while maintaining the required temperature range throughout the rolling process
4Device complexity
If a single rolling device with high roll rise is used to achieve complete thickness reduction, then investment costs and energy consumption are reduced, but the roll rise requirement becomes very high (at least 900 mm)
Solution Approach 1:
The patent changes the key parameter of roll rise from a moderate value (typical for specialized stands) to a high value (at least 900 mm) to enable a single rolling stand to perform the complete thickness reduction. This parameter change allows the rolling stand to accommodate the full range of thickness reductions from large initial cross-sections to final target thickness without requiring multiple devices
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 significantly reduces investment costs, energy consumption, and CO2 emissions while maintaining the quality of the rolled sheets by achieving the desired thickness and flatness in a single rolling process without additional heating, thereby improving the productivity of the rolling mill.
Implementation Method 1
the rolling stock is rolled in the rolling train from a first large initial cross-section with a stepwise thickness reduction to a relatively smaller target cross-section
Data Source
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AI summary
The invention relates to a method for the hot rolling of metal rolling material by means of a plurality of rolling devices disposed in a rolling line, the method comprising the providing of semifinished product having a thickness of greater than or equal to 150 mm as rolling material, the rolling material being rolled in the rolling line from a first large initial cross-section to a relatively smaller target cross-section by incremental decrease in thickness, characterized in that the decrease in thickness from the initial cross-section to the target cross-section is achieved exclusively by means of a single rolling device or by means of a plurality of similar rolling devices of a single rolling stand type. The invention also relates to a hot-rolling mill for carrying out the method.