Rolling Mill Stand Stiffness and Corrosion Control
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Solution Overview
Problem
Existing rolling mill stands face challenges in achieving stiffness uniformity in the transversal direction and efficient roll extraction, leading to issues like jamming, corrosion, and mechanical processing difficulties, especially when dealing with larger-sized tubes.
Innovation Solution
A rolling mill stand design with three adjustable rolls, featuring hydraulic capsules firmly fixed to the external structure, allowing side extraction of the roll-holder cartridge on a horizontal plane, and a sequence of stands tilted by 180° to facilitate horizontal roll changes, ensuring stiffness and preventing corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If hydraulic capsules are firmly fixed to the external structure, then stiffness uniformity in the transversal direction is improved, but device complexity increases
Solution Approach 1:
The rolling mill stand is divided into modular components: a fixed external structure and separate roll-holder cartridges that can be independently replaced. This segmentation allows the hydraulic capsules to be firmly fixed to provide stiffness uniformity, while the modular cartridges simplify maintenance and replacement without requiring complex integration of the entire system.
2Ease of operation
If roll-holder cartridge side extraction is enabled, then ease of operation is improved, but reliability deteriorates due to potential jamming
Solution Approach 1:
The roll-holder cartridge extraction system is designed to operate on a horizontal plane, creating an equipotential extraction path that eliminates gravitational effects and reduces friction. This horizontal extraction mechanism, supported by appropriately arranged hydraulic capsules, ensures smooth cartridge removal and insertion without jamming, improving both ease of operation and reliability simultaneously.
3Adaptability or versatility
If extensions are arranged at 30° with respect to the vertical, then adaptability is improved, but object-affected harmful factors increase due to corrosion and damaging
Solution Approach 1:
The harmful effect of cooling water drainage along the extensions is eliminated by extracting the extensions from the rolling mill stand during the roll change process. The extensions are removed along with the roll-holder cartridge, preventing water accumulation and corrosion. This extraction approach maintains the adaptable 30° extension arrangement while eliminating the harmful corrosion effect.
4Productivity
If the number of stands is restricted to five, then productivity is maintained, but adaptability deteriorates when producing larger-sized tubes
Solution Approach 1:
Each rolling mill stand is designed with universal, interchangeable roll-holder cartridges that can accommodate different roll sizes and configurations. This multi-functionality allows the same five stands to handle a wide range of tube sizes, from small to large diameter tubes, without requiring additional stands. The standardized cartridge design enables flexibility in producing various tube specifications while maintaining high productivity.
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 solution enhances stiffness uniformity, reduces the risk of jamming and corrosion, and improves the mechanical processing of larger tubes by allowing efficient side extraction of roll-holder cartridges without compromising dynamic functionality, leading to improved product quality and reduced mechanical processing difficulties.
Implementation Method 1
at least one respective hydraulic capsule firmly fixed to the fixed structure is provided for each working roll; wherein at least one first hydraulic capsule is of the double stroke type, including in addition to a first working stroke for adjusting the radial position of the respective working roll, a second clearance stroke from the roll axis, to facilitate the side extraction of said roll-holder cartridge
Data Source
AI summary
A rolling mill stand and related rolling mill for rolling rod-shaped bodies, even large in size, which meets the requirement of stiffness uniformity of the rolling mill stands in the transversal direction, all the hydraulic capsules being firmly fixed to the external structure of the rolling mill and providing for the side change of the rolls of each stand. The arrangement of rolling rolls and related extensions of each rolling mill stand is such to avoid problems of corrosion and damaging to the extensions themselves and to the reducers due to the drainage of the cooling waters.