Roll Stand Actuator Layout for Chatter Vibration Damping
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Solution Overview
Problem
Current roll stands for cold-rolling metal products face challenges in effectively damping 3rd octave and 5th octave chatter vibrations, which lead to quality defects and reduced production performance, with existing solutions being complex, costly, and limited in increasing rolling speed.
Innovation Solution
A roll stand equipped with an actuator for active vibration damping, where the actuator is supported on a rack via a readjustment device, allowing it to be positioned in the main force flow, and can be integrated into existing systems without significant structural changes, using piezomechanical or piezohydraulic actuators to eliminate chatter vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive damping methods (increasing friction) are used to prevent chatter vibrations, then vibration reduction is achieved, but the limit chatter speed can be increased only by small amounts (50-200 m/min)
Solution Approach 1:
The patent replaces passive mechanical damping methods (friction-based) with an active control system using actuators that generate counter-vibrations. This substitution allows for significant increases in rolling speed (up to 1000 m/min or more) while maintaining vibration stability, overcoming the limitation of passive methods that only allowed 50-200 m/min speed increases.
Solution Approach 2:
The patent implements an active feedback control system where vibrations are detected and counter-vibrations are generated in real-time to actively cancel out chatter vibrations. This feedback mechanism enables the system to maintain stability at much higher rolling speeds compared to passive damping approaches.
2Reliability
If actuators are integrated into the main force flow of the roll stand, then active damping effectiveness is improved, but structural complexity and integration difficulty increase
Solution Approach 1:
The patent designs the actuator to serve multiple functions: it generates counter-vibrations for active damping while also being integrated into the main force flow to potentially assist with rolling force application. This multi-functionality justifies the structural integration and reduces overall system complexity by combining functions into a single component.
Solution Approach 2:
The patent uses the bearing unit as an intermediary element that connects the actuator to the roll, allowing the actuator to be positioned in the main force flow without requiring direct integration into critical rolling components. This intermediary approach simplifies installation and maintenance while maintaining damping effectiveness.
3Reliability
If existing roll stands are equipped with active damping systems, then chatter vibration reduction is achieved, but the systems become more costly and complex
Solution Approach 1:
The patent extracts the active damping function from a complex integrated system and implements it as a separate, modular actuator unit that can be added to existing roll stands. This extraction approach reduces overall system complexity by isolating the active damping functionality into a standalone component that can be controlled independently.
Solution Approach 2:
The patent changes the operational parameters of the actuator to optimize performance while simplifying control. By adjusting parameters such as actuator positioning, vibration frequency, and amplitude, the system achieves effective chatter suppression with simpler control logic and fewer additional components.
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 effectively reduces vibration-induced quality losses, increases rolling speed, and decreases maintenance needs, enabling reliable achievement of client-requested system speeds while maintaining product quality, without the complexity and cost of existing solutions.
Implementation Method 1
at least one actuator (16) which can be actuated for actively damping vibrations in the roll stand (2)
Implementation Method 2
The supporting roll is guided at its ends via a respective bearing unit on a rack of the roll stand
Data Source
AI summary
The invention relates to a roll stand (2) for rolling, in particular cold-rolling, metal products, comprising at least one actuator (16) which can be actuated for actively damping vibrations in the roll stand (2), and at least one supporting roll (10) which is non-adjustable or can be adjusted exclusively via a readjusting device for pass line adjustment (13) of the roll stand (2) for supporting a working roll (5) and/or intermediate roll of the roll stand (2), wherein the supporting roll (10) is guided at the ends via a respective bearing unit (11) on a rack (8) of the roll stand (2). In order to enable an optimal active damping of vibrations in a roll stand (2) of this type with low engineering effort, the invention proposes that the supporting roll (10) is supported on the actuator (16) via at least one bearing unit (11) and that the actuator (16) is supported on a section (17) of the rack (8) either directly or indirectly via at least one component (14) of the readjustment device (13).