Metal Substrate Mist Cooling for High-Speed Rolling Mills
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The line speed of metal substrates exiting a rolling mill is limited by temperature, leading to substrate quality issues like water staining and off flatness due to inadequate cooling, which restricts rolling mill capacity.
Innovation Solution
A cooling system comprising a cooling header with independently controlled nozzles, a temperature sensor, and a controller to dispense coolant as a fine mist or micronized droplets, positioned near the exit stand to optimize cooling efficiency and prevent the Leidenfrost effect, ensuring the metal substrate remains below the critical softening temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rolling mill operates at higher speeds, then productivity increases, but the metal substrate temperature exceeds the critical softening temperature causing quality issues
Solution Approach 1:
The cooling system is positioned downstream from the exit stand to apply coolant before the metal substrate enters the coiling process, preventing temperature-related quality issues before they occur. This preliminary cooling action allows the rolling mill to operate at higher speeds while maintaining substrate quality below the critical softening temperature.
Solution Approach 2:
The system changes the temperature parameter of the metal substrate by applying coolant to reduce it from above the critical softening temperature to below it, enabling high-speed operation without compromising substrate quality. The controller adjusts cooling parameters based on temperature sensor feedback to maintain optimal temperature conditions.
2Temperature
If traditional cooling methods are used, then substrate cooling is provided, but the Leidenfrost effect occurs reducing cooling efficiency
Solution Approach 1:
The cooling header includes multiple nozzles that can be individually controlled to apply coolant locally to different regions of the metal substrate. This localized cooling approach ensures consistent temperature reduction across the substrate width while preventing the Leidenfrost effect by maintaining reliable coolant-substrate contact in each zone.
Solution Approach 2:
The temperature sensor downstream from the cooling header provides feedback to the controller, which adjusts the cooling header operation to maintain optimal cooling. This closed-loop control ensures consistent cooling performance and prevents the Leidenfrost effect by adapting coolant application based on actual substrate temperature conditions.
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 allows for increased line speeds while maintaining substrate quality by effectively controlling the cooling profile and preventing surface defects, thereby enhancing rolling mill capacity and product consistency.
Implementation Method 1
configured to selectively dispense a coolant onto a metal substrate
Implementation Method 2
the cooling from the work rolls of the rolling mill cannot remove enough deformation energy
Implementation Method 3
positioned near the exit stand to optimize cooling efficiency and prevent the Leidenfrost effect
Data Source
AI summary
Disclosed is a cooling system (104) and method for a metal processing system (100). The cooling system (104) includes a cooling header (114), an exhaust system (118), a temperature sensor (128), and a controller (130). The cooling header (114) selectively dispenses a coolant onto a metal substrate (110), and the exhaust system (118) removes heated coolant from the metal substrate (110). The temperature sensor (128) is downstream from the cooling header (114) and detects a temperature profile of the metal substrate (110) across a width of the metal substrate. The controller (130) is communicatively coupled to the cooling header (114) and the temperature sensor (128), and the controller (130) controls the cooling header (114) based at least on a detected temperature profile.