| 摘要 |
PURPOSE:To straighten effciently a section steel without excessively or insufficiently bending it by measuring the warpage of section steel in real time with the aids of measuring devices while straightening its warpage by a ram and controlling the pressing stroke of the ram according to the straightening quantity obtained from the measured results. CONSTITUTION:Measuring devices 2a-2e are respectively provided to bearing beds 1a- 1e arranged at prescribed intervals, and rams 4a-4e are arranged at the upper positions located oppositely to respective beds 1a-1e. The beds 1b-1d are lowered to support a section steel 3 by the beds 1a and 1e, and the warpage-quantities of section steel 3 are measured by the devices 2a-2e. The projecting quantities of section steel 3 at respective bed-positions with respect to the lines connecting the section steel 3-positions at the adjoining bed-positions, a projecting quantity D3 at a point C' for instance, are operated according to said measured values, to use the results as the straightening quantities. In performing this straightening, when the ram 4c is lowered to deform the section steel 3 after lowering the beds excluding the beds 1b, 1d, the measured results measured by the devices 2a-2e change momently, and the straightening quantities D3 change with said changes. In this way, the material 3 is straightened into a straight line by the ram 4c with changing stroke. |
