Rolling Mill Temperature Control for Precision Cooling
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Summary
Problems
Conventional hot rolling mill exit side temperature control systems experience rapid cooling of materials due to excess coolant discharge, leading to inaccurate temperature control and thickness variations.
Innovation solutions
A temperature control system with a cooling apparatus and control unit that includes spray nozzles, valves, and flow rate detectors, allowing for precise coolant flow management by discharging residual coolant before the material reaches the rolling mill and setting target flow rates based on temperature goals, preventing excessive cooling.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If the spray valve is opened at the same timing as the cooling instruction, then the cooling response is fast, but the material is rapidly cooled by remaining coolant causing temperature control inaccuracy
Why choose this principle:
The system performs preliminary discharge of remaining coolant from the passage before the material arrives. The control unit opens the spray valve earlier than the cooling instruction timing to discharge remaining coolant, then closes it before the material reaches the spray position. This preliminary action removes the harmful remaining coolant that would otherwise cause rapid unintended cooling and temperature control inaccuracy.
Principle concept:
If the spray valve is opened at the same timing as the cooling instruction, then the cooling response is fast, but the material is rapidly cooled by remaining coolant causing temperature control inaccuracy
Why choose this principle:
The system applies preliminary anti-action by discharging remaining coolant in advance to prevent the harmful effect of rapid cooling. By opening the spray valve before the cooling instruction and discharging remaining coolant, the system counteracts the potential harmful effect of excess coolant on the material, ensuring that only the instructed amount of coolant is applied when the material passes.
Application Domain
Data Source
AI summary:
A temperature control system with a cooling apparatus and control unit that includes spray nozzles, valves, and flow rate detectors, allowing for precise coolant flow management by discharging residual coolant before the material reaches the rolling mill and setting target flow rates based on temperature goals, preventing excessive cooling.
Abstract
A rolling mill exit side temperature control system includes the following features. A second valve control unit controls a valve opening of a second valve to cause a flow rate actual value detected by a flow rate detector to coincide with a flow rate target value. A remaining coolant discharging section controls a first valve to an open state and the second valve to a closed state by setting the flow rate target value to zero, before a material to be rolled reaches a rolling mill. A flow rate target value setting section sets the flow rate target value to a value corresponding to a target temperature of the material to be rolled on the entry side and the exit side of the rolling mill after the control by the remaining coolant discharging section.