Movable Restraining Rolls for Stable Metal Sheet Quenching
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Solution Overview
Problem
Existing quenching methods for metal sheets in continuous annealing facilities face challenges in accurately controlling the temperature and preventing shape defects due to variations in the position of restraining rolls and unstable cooling performance, leading to potential shape irregularities and deformation during rapid cooling.
Innovation Solution
A quenching apparatus with movable restraining rolls and a control system that adjusts their position based on the metal sheet's temperature and cooling rate, ensuring precise temperature control within the martensitic transformation range by calculating the optimal distance from the cooling start position to the restraining rolls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If restraining rolls are used to prevent shape defects during quenching, then shape stability is improved, but the position control of restraining rolls becomes complex due to temperature variations
Solution Approach 1:
The restraining rolls are made movable in the conveyance direction, allowing their position to be dynamically adjusted. The roll position changing device enables the restraining rolls to move along the conveyance direction, transforming a static system into a dynamic one that can adapt to varying temperature conditions and maintain optimal restraining position despite temperature fluctuations during quenching
Solution Approach 2:
A control device monitors the temperature of the metal sheet and provides feedback to adjust the position of the restraining rolls accordingly. The control device changes the position of the restraining rolls based on temperature information, creating a closed-loop feedback system that maintains shape stability by adapting the restraining position to the actual thermal state of the material
2Speed
If water jetting nozzles are used for rapid cooling, then cooling rate is improved, but cooling performance becomes unstable due to water interference with movable masking member
Solution Approach 1:
The movable masking member is removed from the system entirely. Instead of using a masking member to control cooling, the invention relies on the movable restraining rolls and temperature-based control to manage shape stability. This eliminates the source of water interference and restores stable cooling performance while maintaining the high cooling rate provided by the water jetting nozzles
3Manufacturing precision
If masking is performed for each nozzle to control cooling position, then local cooling control is improved, but cooling performance varies in steps causing temperature position instability
Solution Approach 1:
The mechanical masking system is replaced with a temperature-based control system. Instead of using physical masking members to control which areas are cooled, the invention uses temperature sensors and control algorithms to monitor and adjust the restraining roll positions based on actual temperature measurements. This substitution eliminates the stepped variations inherent in mechanical masking and provides continuous, stable temperature position control
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 solution effectively suppresses shape variations and deformations by maintaining the metal sheet at a target temperature, enhancing the stability and uniformity of the cooling process, particularly for high-strength steel sheets, thereby improving the manufacturing process and reducing defects.
Implementation Method 1
a technique of rapidly cooling a steel sheet is important
Implementation Method 2
the metal sheet is cooled after heated and causes a phase transformation
Implementation Method 3
This is caused by thermal contraction or the like of the metal sheet due to being rapidly cooled
Implementation Method 4
a restraining roll that conveys the metal sheet cooled by the cooling device while restraining the metal sheet in a thickness direction
Data Source
AI summary
A metal-sheet quenching apparatus that cools a metal sheet while conveying the metal sheet. The metal-sheet quenching apparatus includes a cooling device that cools a metal sheet that is conveyed, restraining rolls that convey the metal sheet cooled by the cooling device while restraining the metal sheet in the thickness direction, a roll moving device that moves the restraining rolls in the conveyance direction of the metal sheet, and a movement control device that controls the operation of the roll moving device to adjust the position of the restraining rolls.