Piezoelectric Injectors for Rolling Mill Vibration Damping
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Solution Overview
Problem
Chattering phenomena due to resonance vibrations in cold rolling mills reduce production capacity and cause surface defects, as existing damping systems either fail to maintain high rolling speeds or introduce energy instability.
Innovation Solution
An active vibration damping system using piezoelectric injectors within the hydraulic circuit of rolling stands, which inject pressurized oil into the hydraulic system under electronic control to counteract vibrations, ensuring dynamic stability and effective damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If passive damping systems are used to reduce vibrations, then vibration damping is achieved, but rolling speed must be reduced which decreases productivity
Solution Approach 1:
The patent replaces passive mechanical damping systems with an active control system using piezoelectric actuators that generate counter-vibrations through electro-mechanical conversion. This substitution enables vibration cancellation without requiring reduction of rolling speed, as the active system can respond dynamically to vibration conditions while maintaining high-speed operation.
Solution Approach 2:
The active damping system employs periodic counter-vibrations generated by piezoelectric actuators that oscillate at the same frequency as the detected vibrations but with opposite phase. This periodic action actively cancels resonance-induced vibrations while allowing the rolling mill to maintain high rolling speeds continuously.
2Speed
If active damping systems with high response speed are used, then vibration damping effectiveness is improved, but system complexity increases
Solution Approach 1:
The patent applies piezoelectric actuators directly at the vibration sources (rolling rolls and resting rolls) rather than using a centralized complex control system. This localized approach achieves high response speed by placing the actuators where they are most needed, while reducing overall system complexity by eliminating the need for complex transmission mechanisms and centralized control architecture.
Solution Approach 2:
The system utilizes the inherent fast response characteristics of piezoelectric materials, which can change their physical state (deformation) almost instantaneously in response to electrical signals. This parameter change capability enables the actuators to achieve microsecond-level response speeds, effectively damping high-frequency vibrations without requiring complex control algorithms or additional mechanical components.
3Force
If multiple rolling rolls and resting rolls are used to increase rolling force, then rolling capacity is improved, but the system becomes more susceptible to resonance vibrations
Solution Approach 1:
The patent implements an active feedback control system where vibrations are detected by sensors mounted on the rolling rolls and resting rolls, and the detected vibration signals are used to drive piezoelectric actuators that generate counter-vibrations. This closed-loop feedback mechanism effectively cancels resonance vibrations in multi-roll systems while maintaining the high rolling forces necessary for cold rolling operations.
Solution Approach 2:
The system converts the harmful resonance vibrations into beneficial counter-vibrations by using the detected vibration signals to drive piezoelectric actuators that generate equal and opposite vibrations. This approach transforms the problematic vibrational energy into a useful control mechanism that actively cancels the harmful effects of resonance in multi-roll configurations.
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 active damping system effectively cancels resonance-induced vibrations, maintaining high rolling speeds and preventing surface defects, while being simpler and more compact than prior solutions.
Implementation Method 1
The injectors are preferably of the piezoelectric type for obtaining a more rapid and effective response in damping the vibrations occurring in a rolling stand
Implementation Method 2
two hydraulic cylinders placed, for example, on the top of the stand or under the stand, and acting on the resting chocks for adjusting the distance between the rolling rolls
Implementation Method 3
The injectors are adapted to inject pressurized oil into a respective chamber of the hydraulic actuators under the control of an electronic control unit
Data Source
AI summary
The active vibration damping system of a rolling mill comprises a rolling stand and an adjustment system for the bending of the rolling rolls (1, 1′) having hydraulic actuators (2\2″, 2″′, 2iv) acting on the chock (20) of the rolling rolls (1, 1′) and hydraulic feeding circuits (7, 9, 11, 12) and injectors (8′, 8″, 8″′, 8iv), preferably piezoelectric injectors, directly inserted into the chambers (6\6″, 6″′, 6iv) of the hydraulic actuators (2′, 2″, 2″′, 2iv) with the advantage of exploiting the dampening effect resulting from the high- pressure oil injection.