US 8,684,068 B2Granted

Apparatus and method for controlling horizontal oscillation of an edge dam of a twin roll strip caster

AssigneePosco

InventorsOh-Seong Kweon, Kwi-Ju Hwang, Yoon-Ha Kim, Ji-Woong Jun, Sang-Hoon Kim

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Abstract

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.

Claims17

Dependent claims

An apparatus for controlling horizontal oscillation of an edge dam of a twin roll strip caster, the apparatus comprising:

an oscillation unit horizontally oscillating 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 outputting the oscillation waveform to the oscillation unit to perform the horizontal oscillation;
and
a control unit applying the oscillation waveform to the servo valve, thus controlling the horizontal oscillation of the oscillation unit,
wherein the control unit comprises:
an oscillation information collector collecting from an HMI (Human Machine Interface) information about an ON/OFF status of the oscillation, and an amplitude, a frequency and a waveform of the oscillation;
an oscillation waveform generator generating, using the information received from the oscillation information collector, a reference of the oscillation waveform having an amplitude and a frequency that are required to control the horizontal oscillation;
and
a horizontal oscillation controller controlling the servo valve both using the information about the oscillation waveform received from the oscillation waveform generator and using information about a position of the oscillation unit that is received from an oscillation-unit-displacement measuring device, thus controlling the horizontal oscillation of the oscillation unit.

6 more elements

A method for controlling horizontal oscillation of an edge dam of a twin roll strip caster, the method comprising horizontally oscillating an oscillation plate using a servo valve and a cylinder in accordance with an oscillation waveform so that an edge dam refractory coupled to the oscillation plate horizontally oscillates, thus eliminating a zone which does not oscillate, and reducing edge skull, wherein the horizontally oscillating comprises:

an operation of selecting information about an ON/OFF status of the oscillation, and an amplitude, a frequency and a waveform of the oscillation using an HMI (Human Machine Interface) monitor;
a slow loop operation of collecting the information selected using the HMI monitor and transmitting the information to a medium loop;
a medium loop operation of generating, using the information received from the slow loop, a reference of the oscillation waveform having an amplitude and a frequency that are required to control the horizontal oscillation, and transmitting the reference to a fast loop;
and
a fast loop operation of controlling the servo valve both using the information about the reference of the oscillation waveform received from the medium loop and using information about a position of an oscillation unit received from an oscillation-unit-displacement measuring device, thus controlling horizontal oscillation of the oscillation unit.

2 more elements

Dependencies are inferred from the claim text.