JPS5492561A - Controlling method for automatic steel shape straightener - Google Patents

Abstract

PURPOSE: To make obtainable the straightened product at high accuracy through the simple operation, by correcting the position of the roll on the exit side so as to change the curvature once or more times depending on the difference between the operated value under the assumption that the material to be straightened is really straight and the actually detected value.

CONSTITUTION: The position detector 6 for the vertical position is arranged for the lower roll 2a on the exit side of the automatic steel shape straightener, the position detector 12 for the upper and lower position is arranged for the measuring roller 7, and the position detecting roller 13 is arranged on the upper face of the material to be straightened so as to contact each other. When the straightening work is to be performed, the total length L of the material 8 to be straightened is previously measured, and the correction of position of the lower roll 2a on the exit side is instantaneously carried out depending on the difference between the operated value for the tip a₁ portion and the output of position detectors 6, 12 and 13; and this correction is continued until the effect of correction becomes detectable. Next, at the point a₂ above the undetectable range (b), the difference is measured; and further, at the point of finishing the straightening work for L/2 of the material, the material is turned over and the bend is straightened depending on the second difference. According to this method, the straightened product can be obtained at high accuracy.

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