PURPOSE: To inspect the function of a sensor and search the position of an accident by comparing the value of a measured parameter indicating the state of a product with the value of a calculated parameter, and comparing the value of the measured parameter with an allowable bracket.
CONSTITUTION: Parameters of a product indicate width Ii, feed speed Vi, thickness (ei) and temperature (ti), and parameters indicating each process Pi show force Fi output by the strip of a roll, current Ii flowing in a drive motor and a position Mi of an adjustment screw of the roll. The parameters of the product are calculated with a mathematical model. A calculation unit compares a value (en) measured with a thickness sensor with a calculated value of (en). Their values are similar, the measured value (en) sufficiently gives a reference, and if it is within an allowable bracket, it is regarded as the process and a sensor correctly function. If the measured value (en) is not within the allowable bracket, it is estimated that the sensor for measuring the thickness correctly functions, and does not function at the stage of a rolling stand. If the measured value (en) is different from the calculated value of (en), it is estimated an accident of the sensor or malfunction of the process.
Philippe Keener
Dennis Filipe
Alan Puissan
Jose Lago
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