加工熱処理厚鋼板の残留応力と条切りキャンバー

概要

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Camber or in-plane warping of plates after longitudinal cutting occasionally becomes a problem, because it is very difficult to correct the deflection. In particular, the slit camber is large for steel plates by controlled rolling or cooling. As the slit camber is related to the residual stress, we carried out thermal stress analysis on the cooling process of steel plates. Then we considered a one-dimensional longitudinal stress state, thermoelastic-plastic material and stress relaxation. We examined the effect of controlled rolling (CR) and controlled cooling (On-Line Accelerated Cooling, abbreviated to OLAC) on the camber. The outline of result obtained is as follows. (1) Stress just after non-uniform deformation in ordinarily controlled rolling with the finishing temperature of 680-780℃ causes the residual stress of maximum 100 MPa at room temperature. Therefore, the influence of rolling condition on the slit camber cannot be ignored. (2) The type of controlled rolling which generates tensile residual stress in the edge of width, reduces the slit camber caused by non-uniform cooling during OLAC. (3) Optimum value of masked edge for reducing the slit camber is 50-100 mm for 30 mm thickness. (4) Lower initial temperature or higher end temperature in controlled cooling reduces residual stress and its slope, which results in smaller slit camber.
社団法人日本鉄鋼協会の論文
1989-08-01