Roll Gap Coolant Distribution for Strip Thickness Control
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Solution Overview
Problem
Existing methods for applying coolants to rolled products and roll stands in rolling mills fail to maintain maximally constant and stable cooling and lubricating conditions, leading to detrimental thickness influences and excessive temperatures.
Innovation Solution
A method where the coolant quantity is determined as a function of effective power in the roll gap, with distributed application across zones based on flatness distribution, using cooling nozzles to ensure consistent cooling and lubrication, and adjusting coolant quantities dynamically until a predetermined difference falls below a set value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If coolant quantity is increased to prevent overheating, then temperature control improves, but thickness variations worsen
Solution Approach 1:
The patent applies different coolant quantities to different zones along the roll gap based on the local effective power distribution. The roll gap is divided into multiple zones, and each zone receives coolant in proportion to its effective power, ensuring that areas with higher power dissipation (and thus higher temperature) receive more cooling, while maintaining overall thickness uniformity.
Solution Approach 2:
The patent dynamically adjusts the coolant quantity parameter based on the effective power in the roll gap. By calculating the effective power and distributing coolant proportionally, the system adapts the cooling parameter to match the actual thermal conditions, preventing both overheating and thickness variations.
2Ease of operation
If coolant is applied uniformly across the roll gap, then application simplicity improves, but cooling stability worsens
Solution Approach 1:
Instead of uniform coolant application, the patent implements zone-specific coolant distribution where each zone along the roll gap receives coolant in proportion to its local effective power. This creates locally optimized cooling conditions that stabilize temperatures across different regions of the roll gap.
Solution Approach 2:
The patent transitions from static uniform coolant application to dynamic zone-proportional application. The coolant distribution is continuously adjusted based on the effective power distribution in different zones, making the cooling system adaptive to varying thermal conditions along the roll gap.
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 approach minimizes thickness variations and prevents overheating by maintaining constant and stable cooling and lubrication conditions, ensuring consistent product quality and roll stand performance.
Implementation Method 1
The application of coolants, usually oil or oil emulsion, serves to cool the rolled product and/or the rolls of a roll stand
Implementation Method 2
The utilization of coolants or lubricants when rolling rolled products
Implementation Method 3
the coolant can also, or in an extreme case exclusively, serve as a lubricant
Data Source
AI summary
There is described a method for applying a coolant to a rolled product and/or to at least one cylinder of a roll stand provided with a rolling gap. During the method the following steps can occur: determining a total cooling rate applicable according to the effective power in the rolling gap, determining the cooling rate for several areas according to a flatness distribution determined b a flatness measuring system, wherein the difference in the cooling rate is determined by comparing the totality of the thus determined cooling rates with a predetermined total cooling rate and is used for determining the components of an additional cooling rate for the areas taking into account the top and lower limits of the cooling rate thereof. Said procedure is repeated in such a way that the coolant differences remain above a predefinable value.