US 7,740,051 B2Granted

Method and apparatus for detecting crater end of continuously cast product, and method for producing continuously cast product

AssigneeJfe Steel Corporation

InventorsYukinori Iizuka, Jun Kubota, Koichi Tsutsumi

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Abstract

A method for detecting a crater end of a continuously cast product including installing an ultrasonic shear wave sensor for transmitting an ultrasonic shear wave to a cast product and receiving the transmitted ultrasonic longitudinal wave and an ultrasonic longitudinal wave sensor for transmitting an ultrasonic longitudinal wave to the cast product and receiving the transmitted ultrasonic longitudinal wave at the same position in a continuous casting machine or at positions apart from each other in a casting direction, but at the same position in a transverse direction of the cast product, detecting based on variations of an ultrasonic signal received by the ultrasonic shear wave sensor that the crater end of the cast product is matched with the installed position of the ultrasonic shear wave sensor, calibrating a calculation formula for determining the crater end and determining the crater end.

Claims13

Dependent claims

A method for detecting a crater end of a continuously cast product, the method comprising the steps of

installing an ultrasonic shear wave sensor for transmitting an ultrasonic shear wave to the continuously cast product and receiving the transmitted ultrasonic shear wave and an ultrasonic longitudinal wave sensor for transmitting an ultrasonic longitudinal wave to the continuously cast product and receiving the transmitted ultrasonic longitudinal wave at the same position in a continuous casting machine or at positions apart from each other in a casting direction, but at the same position in a transverse direction of the cast product,
detecting based on variations of an ultrasonic signal received by the ultrasonic shear wave sensor that the crater end of the cast product is matched with an installed position of the ultrasonic shear wave sensor,
calibrating a calculation formula for determining the crater end from a propagation time of an ultrasonic longitudinal wave signal such that the crater end computed from the propagation time of the ultrasonic longitudinal wave signal at that time is matched with the installed position of the ultrasonic shear wave sensor, and after the calibration,
determining the crater end from the propagation time of the ultrasonic longitudinal wave signal based on the calibrated calculation formula.

1 more element

An apparatus for detecting a crater end of a continuously cast product, the apparatus comprising

an ultrasonic shear wave sensor made up of an ultrasonic shear wave transmitter for transmitting an ultrasonic shear wave to the continuously cast product and an ultrasonic shear wave receiver for receiving the transmitted ultrasonic shear wave,
an ultrasonic longitudinal wave sensor made up of an ultrasonic longitudinal wave transmitter for transmitting an ultrasonic longitudinal wave to the continuously cast product and an ultrasonic longitudinal wave receiver for receiving the transmitted ultrasonic longitudinal wave, the ultrasonic longitudinal wave sensor being installed at the same position in a continuous casting machine as the ultrasonic shear wave sensor or a position apart from the ultrasonic shear wave sensor in a casting direction but at the same position in a transverse direction of the cast product, and
a crater end computing unit for determining the crater end of the cast product by using a calculation formula in accordance with an ultrasonic signal received by the ultrasonic longitudinal wave sensor and for calibrating the calculation formula, at the time when it is confirmed based on variations of an ultrasonic signal received by the ultrasonic shear wave sensor that an installed position of the ultrasonic shear wave sensor and the crater end of the cast product are matched with each other, such that the crater end computed based on the calculation formula is matched with the installed position of the ultrasonic shear wave sensor.

Dependencies are inferred from the claim text.