PRODUCTION OF TAPERED PLATE

摘要

PURPOSE:To compensate a difference between a target plate thickness and an actual plate thickness and to produce a tapered plate having high dimensional accuracy and light weight by rolling a material to be rolled to a shape having a prescribed taper grade over the entire length of this material and changing a product taking position at the time of cutting. CONSTITUTION:The material 1 to be rolled is so rolled by final rolling that the target thickness at the point P1 of the length A from the front end of the thin part attains (a) and the target thickness at a point P2 of the prescribed length L in a direction of the thick part from this point P1 attains (b) and that the taper inclination thereof attains alpha over the entire length in the longitudinal direction. The length from the rear end at the point P2 of this time is B. The plate thickness profile in the longitudinal direction of the material 1 to be rolled is first measured in a cutting stage and the cutting position is adjusted in a range where a size defect does not arise in the longitudinal direction. The positions where the values of the respective target thicknesses (a), (b) as the plate thicknesses at the front end and the rear end are obtainable are set at the cutting position, by which the tapered plate free from the difference in the actual thickness from the target thickness is taken.