PRESS STRAIGHTENING METHOD FOR BAR STEEL STOCK

PURPOSE:To improve the straightening accuracy and working efficiency by finding the necessary press load, etc., based on the relation of the press load found in advance and residual displacement measure and acting this press load, etc., on a bar steel stock. CONSTITUTION:A distance sensor 5 is set up at the center position between anvils 3, 3 of a straightening machine 2 and a pressure sensor 7 on the ram 6 for pressing a straightening piece 4 as well. A p-delta diagram is made in advance by using the distance sensor 5 and pressure sensor 7 on a bar stock 1. The load removal start point Q of each straightening point is found in the p-delta diagram after reading the straightening amount and straightening point of the bar stock 1 and the necessary press displacement measure or press load is read. The straightening is then performed by acting this displacement measure or load on the bar stock 1. Since the work can be performed in short time by one worker the streightening accuracy and working efficiency can be improved.