Twin Roll Strip Caster Edge Dam Oscillation Control
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Solution Overview
Problem
Existing twin roll strip casting processes face challenges in controlling the horizontal oscillation of edge dams, leading to the formation and growth of edge skull, which damages casting rolls and affects strip quality, as conventional oscillation methods are inflexible and may damage the edge dam or leave dead zones where skull forms.
Innovation Solution
An apparatus and method utilizing a servo valve and hydraulic cylinder to horizontally oscillate an edge dam refractory according to a variable oscillation waveform, allowing for real-time control of amplitude, frequency, and waveform to prevent skull formation and growth, ensuring stable casting and improved strip quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the edge dam is oscillated with fixed amplitude using conventional mechanical methods, then skull removal is achieved, but the amplitude cannot be adjusted and dead zones form at the center
Solution Approach 1:
The patent applies dynamics by transitioning from fixed mechanical oscillation to variable hydraulic oscillation. The hydraulic cylinder system allows the oscillation amplitude and frequency to be dynamically adjusted during the casting process, eliminating dead zones and adapting to different skull formation conditions without requiring mechanical reconfiguration.
Solution Approach 2:
The patent implements parameter changes by using a hydraulic control system that can vary oscillation amplitude and frequency parameters in real-time. This allows optimization of skull removal effectiveness while preventing dead zone formation, unlike conventional fixed-amplitude mechanical oscillation systems.
2Manufacturing precision
If the oscillation amplitude is increased to eliminate dead zones, then skull removal improves, but damage to the edge dam and casting rolls occurs
Solution Approach 1:
The hydraulic oscillation system enables dynamic adjustment of oscillation parameters, allowing the amplitude to be optimized for skull removal while remaining within safe limits that prevent edge dam damage. The system can adapt amplitude in real-time based on process conditions.
Solution Approach 2:
The system incorporates feedback control where the oscillation parameters are monitored and adjusted based on skull formation observations and process conditions, ensuring effective skull removal while preventing excessive oscillation that could cause damage to the edge dam structure.
3Manufacturing precision
If conventional mechanical oscillation systems are used, then skull is physically removed, but the system lacks flexibility and requires component replacement for amplitude changes
Solution Approach 1:
The patent replaces the conventional mechanical oscillation system with a hydraulic oscillation system. This substitution eliminates the need for mechanical component replacement when amplitude changes are needed, as the hydraulic system can adjust amplitude electronically through the servo valve and control unit.
Solution Approach 2:
The patent employs hydraulic technology using a hydraulic cylinder and servo valve to control edge dam oscillation. This allows flexible and precise control of oscillation amplitude and frequency without mechanical reconfiguration, replacing the rigid mechanical eccentric shaft system with a controllable hydraulic actuation system.
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 solution effectively removes edge skull, suppresses its generation, and prevents damage to casting rolls and edge dams by dynamically controlling oscillation parameters, ensuring the stability and quality of the casting process.
Implementation Method 1
a hydraulic cylinder (420) fastened to the main body (450), a cylinder rod (425) placed through the hydraulic cylinder (420) so as to be movable to opposite sides of the hydraulic cylinder (420)
Implementation Method 2
the lower portion of the oscillation plate oscillates around a bearing 301 provided on the center of the oscillation plate in the same manner as that of a pendulum
Data Source
AI summary
An apparatus and method for controlling the horizontal oscillation of an edge dam of a twin roll strip caster is provided. The apparatus includes an oscillation unit which horizontally oscillates an oscillation plate in accordance with an oscillation waveform so that an edge dam refractory coupled to the oscillation plate horizontally oscillates, a servo valve which outputs the oscillation waveform to the oscillation unit, and a control unit which applies the oscillation waveform to the servo valve, thus controlling the horizontal oscillation of the oscillation unit. The amplitude, frequency and waveform of the oscillation are variably controlled depending on casting conditions. The edge dam horizontally oscillates, using the servo valve and a hydraulic cylinder, thus rapidly removing edge skull and suppressing the generation and growth of skull, thereby preventing a casting roll or edge dam from being damaged.