CONTROLLING METHOD FOR REELER FOR PROCESSING SEAMLESS STEEL PIPE

PURPOSE:To manufacture a seamless steel pipe with an excellent roundness along the longitude, by controlling the reeling process according to a control period settled upon a prescribed one point in the circumference of a steel pipe to be rolled, independently of the finishing diameter of the steel pipe or of the diameter of the rolling roll. CONSTITUTION:A measuring device 4 for measuring the number of rotation of a roll is attached to a rolling roll 1 in order to always measure the number of rotation of the roll 1. A control period computer 5 receives the number of rotation of the roll 1 measured by the device 4 at the beginning of the rolling process for a material 2 to be rolled, the rolling specification for the material 2 to be rolled sent from a rolling specification memory unit 6, and the specification of the roll 1 and the designated controlling times per one turn of the material 2 to be rolled sent from an initial set data memory unit 7; the computer 5 then operates a control period from these inputted data. This control period is taken as the next computing timing of the control periord computer 5. These procedures are repeated successively from the beginning to the end point of the rolling process. Meanwhile, a rolling reduction's set point computer 8 computes the set point of the rolling reduction for every control action of the computer 5, and shifts the roll 1 to a correct position.