Cold Tandem Mill Lubrication Control for Horizontal Chatter Suppression
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Solution Overview
Problem
Existing cold rolling methods experience horizontal chattering due to mill vibration, which is not effectively addressed by conventional backlash absorbing devices, leading to variations in rolling object thickness and reduced productivity.
Innovation Solution
A cold rolling facility and method that utilize a dual-emulsion rolling oil supply system, adjusting the ratio of first and second emulsion rolling oils to maintain appropriate horizontal forces across neighboring rolling stands, suppressing chattering through controlled oil supply based on detected horizontal forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional circulating oiling method is used for high-load cold rolling, then rolling oil is supplied cyclically to reduce friction, but lubrication becomes insufficient and horizontal chattering occurs at several tens of Hz
Solution Approach 1:
The patent combines the circulating oiling method and direct oiling method into a hybrid lubricating system. The circulating oiling system provides continuous lubrication while the direct oiling system supplements with additional rolling oil, ensuring sufficient lubrication under high-load conditions and preventing horizontal chattering.
Solution Approach 2:
The patent controls the supply amount of the second rolling oil in the direct oiling system to adjust the final friction coefficient of the rolling stand. By dynamically changing the lubrication parameters, the system maintains optimal friction levels to prevent horizontal vibration while ensuring adequate lubrication.
2Stability of the object's composition
If a backlash absorbing device is arranged between roll chock and housing, then clearance is filled toward one direction, but horizontal vibration reoccurs due to deterioration or breakdown of the device
Solution Approach 1:
The patent replaces the mechanical backlash absorbing device with a lubrication-based solution. Instead of relying on mechanical components to fill clearance and absorb backlash, the system uses controlled rolling oil supply to reduce friction and stabilize roll position, eliminating the reliability issues associated with mechanical device deterioration.
3Ease of operation
If work roll and intermediate roll are arranged with offset to fill clearance, then horizontal force stabilizes work roll position, but thickness variation occurs due to mill vibration in horizontal direction
Solution Approach 1:
The patent dynamically adjusts the lubrication parameters (rolling oil supply amount and concentration) to control the friction coefficient, thereby stabilizing the horizontal force on the work roll. This prevents both excessive position instability and thickness variation caused by horizontal vibration.
Solution Approach 2:
The system monitors rolling conditions and adjusts the rolling oil supply accordingly to maintain optimal friction levels. By implementing feedback control of the lubrication system, the patent prevents horizontal vibration that causes thickness variation while maintaining proper roll 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
The method effectively suppresses horizontal chattering, ensuring stable rolling conditions and improved yield ratios in metal plate production.
Implementation Method 1
rolling oil plays a role as a lubricant agent (lubricating oil) for reducing friction generated between the rolling object material and the rolling rolls
Implementation Method 2
the rolling oil also plays a role as a cooling agent for cooling the rolling object material and the rolling rolls in such a manner that the temperatures of the rolling object material and the rolling rolls do not rise excessively due to friction heating or processing heating
Data Source
AI summary
A cold rolling facility includes: a cold tandem mill including rolling stands; and a rolling supply system including a first rolling oil supply system configured to supply first emulsion rolling oil, and a second rolling oil supply system configured to supply second emulsion rolling oil, wherein mixed rolling oil obtained by mixing the first and the second emulsion rolling oil is supplied at least to a specific rolling stand among the rolling stands in such a manner as to satisfy the following formula (1), 0.6≤F2/F1≤1.4 (1), where F1 denotes first horizontal force acting in a rolling direction on a roll included in the specific rolling stand, and F2 denotes second horizontal force acting in a rolling direction on a roll included in an upstream side rolling stand arranged on an upstream side of the specific rolling stand and neighboring with the specific rolling stand.