METHOD OF MEASURING TEMPERATURE OF WIRE ROD COIL DURING CONVEYANCE, COOLING METHOD THEREFOR, AND METHOD OF COOLING WIRE ROD UNDER ROLLING

摘要

PROBLEM TO BE SOLVED: To provide a method capable of inexpensively measuring a temperature of the whole wire rod coil. SOLUTION: The temperature of the wire rod coil satisfying a condition of D<=RC<=W is measured at a scanning speed of t1>=t2 using a scanning type radiation thermometer located with a distance of h=h1+h2 in an upper side of a conveyer, having a temperature-measuring scanning range RS=2h.tan (θ1)/2}, having, in an RC<=RS, an angleθS within 45-135 deg. in a scanning direction with respect to a coil conveying direction, and having a field diameter, in a scanning angle center, smaller than a diameter of the wire rod, and the wire rod coil temperature in a zone is found based on the maximum temperature of the zone divided along the conveying direction in every prescribed time. Where, D is an outside diameter of a wire rod coil ring, RC is a width in a direction orthogonal to the conveying direction of the wire rod coil, W is a width of a conveyer, RS is a temperature-measuring scanning range in a direction orthogonal to the wire rod coil conveying direction of a thermometer, h is a distance from the conveyer to a photoreceiving element of the thermometer, h1 is a focal point of the thermometer, h2 is a distance between the conveyer and a surface layer part of the wire rod coil,θ1 is a temperature-measuring scanning angle of the thermometer whenθS is 90 deg., t1 is a wire rod coil passing time in a view field of the thermometer, and t2 is a response time of the photoreceiving element of the thermometer.