WARPAGE STRAIGHTENING METHOD OF ANGLE STEEL

摘要

PURPOSE:To straighten accurately the warpage in longitudinal direction by forming a dent on the face of one side of an angle steel and by straightening the warpage in a longitudinal direction of other sides with the movement of the material in the outer direction of the dent in such case. CONSTITUTION:The other side 14 of an angle steel 7a is placed on a table 3 and the dent forming position 15 which is shifted in the width direction from the medium position in the width direction of the other side 14 is located immediately under a punch 8. A hydraulic oil is fed to a hydraulic cylinder 5 with giving a command to an oil pressure circuit 10 via a control circuit 11 by an operation part 12 and the punch 8 is descended. The punch 8 forms a dent on the plate face of the angle steel 7. In case of forming the dent the straightening condition of the angle steel 7 is dscriminated by a linear gage 4 due to the plastic deformation moving the material of the angle steel 7 in the outer direction of the dent being caused. The pressing by the necessary quantity is then performed by the punch 8. The following dent is thereafter formed with shifting the angle steel 7 so that following dent forming position 15 can correspond to the punch 8. The warpage in longitudinal direction is thus corrected.