Continuous Casting Line Layout for Billet Solidification and Rolling Stops
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Solution Overview
Problem
Conventional continuous casting and rolling plants face inefficiencies and high costs due to disconnected machinery, leading to partial production discontinuity, energy waste, and increased operating costs, especially during rolling train stops.
Innovation Solution
A continuous casting and rolling plant design with an in-line process, featuring a continuous casting machine, first and second cutting devices, and a rolling train, where the first cutting device is positioned closer to the crystallizer, allowing for reduced plant size, energy efficiency, and minimal material waste by managing rolling train stops without halting the casting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first cutting device is positioned farther from the crystallizer to ensure complete solidification of billets, then the reliability of the rolling process is improved, but the plant length and construction cost increase significantly
Solution Approach 1:
The patent applies dynamics by making the cutting device position adjustable rather than fixed. The cutting device can be moved along the casting direction to adapt to different casting speeds and billet sizes, allowing the plant to maintain compact length while ensuring complete solidification under varying operational conditions
Solution Approach 2:
The patent changes the parameter of cutting device position dynamically. By adjusting the distance between the crystallizer and cutting device based on casting speed and billet characteristics, the system ensures complete solidification without requiring excessive plant length, thus resolving the contradiction between reliability and compactness
2Adaptability or versatility
If the casting line and rolling line are disconnected with intermediate storage, then the adaptability to operational changes is improved, but the productivity and continuity of production deteriorate
Solution Approach 1:
The patent merges the casting line and rolling line into a continuous integrated process. The cutting device is positioned to enable seamless transition from casting to rolling without intermediate storage, maintaining production continuity while allowing operational flexibility through adjustable cutting position and speed coordination
Solution Approach 2:
The patent ensures continuity of useful action by eliminating idle time and intermediate storage between casting and rolling. The integrated design allows the rolling process to continuously receive billets from the casting process, maximizing productivity while maintaining adaptability through controllable cutting parameters
3Productivity
If the plant operates in endless mode with rigid connection between casting and rolling, then the productivity is improved, but the loss of production during rolling stops increases
Solution Approach 1:
The patent applies segmentation by introducing a cutting device that divides the continuous casting into discrete billets. This allows the casting process to continue independently while the rolling process can be stopped and restarted without affecting overall production, thus maintaining high productivity while reducing production loss during stops
Solution Approach 2:
The patent uses preliminary action by pre-cutting billets to appropriate lengths before rolling. This preparation allows the rolling process to be interrupted and restarted without halting the casting process, maintaining productivity while minimizing production loss during necessary stops
4Manufacturing precision
If the distance between crystallizer and cutting device is increased to ensure solidification, then the manufacturing precision of billet quality is improved, but the energy efficiency and thermal retention deteriorate
Solution Approach 1:
The patent applies dynamics by making the cutting device position adjustable. The system can optimize the distance between crystallizer and cutting device for each specific casting operation, ensuring complete solidification while minimizing the distance to reduce thermal dissipation and energy loss
Solution Approach 2:
The patent changes the positional parameter dynamically based on casting speed and billet characteristics. By optimizing this parameter, the system ensures complete solidification (manufacturing precision) while minimizing the distance traveled, thereby reducing thermal dissipation and energy loss
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 design results in a compact, energy-efficient plant that minimizes production losses and operating costs by allowing continuous production, reducing thermal dissipation, and optimizing the use of enthalpy from liquid steel, while enabling emergency procedures to manage rolling train stops without interrupting the casting process.
Implementation Method 1
a continuous casting machine (1), in particular comprising a water-cooled crystallizer (2)
Implementation Method 2
the closure of the liquid cone of the billet occurs before said bed; wherein said first cutting device (4) is arranged at a first distance A, expressed in meters, from the crystallizer (2)
Implementation Method 3
the billets are then sent to the heating furnace, conventionally gas-fired, which brings them to a temperature suitable for being rolled
Data Source
AI summary
A continuous casting and rolling plant for the continuous production of steel bars or profiles, the plant comprising in sequence, along a processing line, a continuous casting machine adapted to cast a billet; a first cutting device; a second cutting device; a rolling train adapted to roll the billet; wherein the continuous casting machine comprises a crystallizer, and is adapted to cast the billet at least at a first casting speed v1 and at a second casting speed v2 greater than the first casting speed v1; wherein the first cutting device is arranged at a first distance from the crystallizer expressed in meters, along the processing line, calculated according to a specific mathematical relation.