Metal Strip Quenching with Staged Nozzle Cooling for Flatness
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Solution Overview
Problem
Metal substrates processed through rolling often fail to achieve desired properties such as strength, formability, and corrosion resistance, particularly in applications like automotive and electronics, due to insufficient cooling techniques that result in temperature inconsistencies and flatness issues.
Innovation Solution
A quenching system with top and bottom nozzles that selectively distribute a cooling agent to reduce the metal substrate's temperature from an initial state to a target state, with the top nozzles stopping at an intermediate temperature and the bottom nozzles continuing to cool to the target temperature, ensuring uniform cooling and improved flatness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If both top and bottom nozzles are operated simultaneously to cool the metal substrate, then the cooling speed is increased, but temperature inconsistency and flatness issues occur due to uneven cooling distribution
Solution Approach 1:
The system dynamically switches between different nozzle configurations (both nozzles on, only bottom nozzle, only top nozzle) based on real-time temperature feedback from multiple sensors, allowing the cooling process to adapt to changing temperature conditions and achieve both rapid cooling and uniform temperature distribution
Solution Approach 2:
Multiple temperature sensors positioned at different locations on the metal substrate provide real-time temperature feedback to the control system, which adjusts the nozzle operation accordingly to maintain temperature consistency and prevent flatness issues while achieving rapid cooling
2Shape
If the top nozzles are deactivated early to improve flatness, then flatness is improved, but the cooling efficiency is reduced
Solution Approach 1:
The top nozzles are activated in periodic phases: initially both nozzles are on for rapid cooling, then top nozzles are deactivated to improve flatness, and can be reactivated later if temperature conditions require additional top-surface cooling, creating a periodic on-off pattern that balances both flatness and cooling efficiency
3Productivity
If the metal substrate is cooled rapidly to achieve desired temperature, then productivity is improved, but temperature gradients cause flatness issues
Solution Approach 1:
The cooling process is segmented into multiple phases with different nozzle configurations: initial rapid cooling with both nozzles, intermediate flatness-improvement phase with only bottom nozzle, and optional final adjustment phase with selective nozzle activation, allowing the system to achieve both high productivity and good flatness through staged cooling
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 method rapidly quenches metal substrates, enhancing their properties like strength and corrosion resistance while maintaining or improving flatness by controlling temperature gradients and tension distribution across the substrate.
Implementation Method 1
a top nozzle configured to distribute a cooling agent on a top surface of the rolled metal substrate. The quenching system includes a bottom nozzle configured to distribute the cooling agent on a bottom surface of the rolled metal substrate
Data Source
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AI summary
Systems and methods of quenching a metal substrate include cooling a top surface and a bottom surface of the metal substrate until a strip temperature is cooled to an intermediate temperature. Cooling of the top surface of the metal substrate is discontinued when the strip temperature reaches the intermediate temperature, and cooling of the bottom surface of the metal substrate continues until the metal substrate reaches a target temperature, where the target temperature is less than the intermediate temperature.