| 摘要 |
PURPOSE:To enhance the modification accuracy of a standard surface by measuring and storing the warp quantity of a section generating in a downward projected form and correcting the warp quantity, measured by inverting the section by 180 deg., based on the stored value and modifying the section based on the corrected value. CONSTITUTION:A steel section 1 is put on supporting posts 2a, 2b with its standard surface 1a faced downward, and its bent quantity delta with respect to a zero point 7 is measured by a measuring device 3 to store the results in an arithmetic unit. When the warp of sectional is downward projected, the section 1 is inverted by 180 deg. to make its surface 1a face upward, and a modification value delta2=delta1-delta is obtained by measuring the warp quantity delta1. Next, a ram 4 is lowered, to correct the position of surface 1a so as to set it to the point at a distance delta2 from the zero point 7. In this way, the warp of section 1 of the standard surface side is modified to be within a range of specifications, even when the sectional has non-parallel upper and lower faces or recessing grooves. |
