| 摘要 |
PURPOSE:To remarkably improve the yield of rolling, by rolling a material in an optimum edging condition basing on formulas for predicting the change of plane shape of the material to be rolled after a horizontal rolling and on formulas for predicting a plane shape of the material after a dog bone reduction pass in edging. CONSTITUTION:A numerical value of changing quantity DELTAWA of the width spreading of a material to be rolled after horizontally rolling the material having a rectangular crosssection, and a numerical value of changing quantity DELTALA of the crop length, are respectively predicted by using formulasI-IV. In the formulas, the following items are expressed by symbols respectively, rT; total draft from the thickness of a slab (h0) to the plate thickness (h) at the exit side of a horizontal pass required to obtain now. W0; the width of slab, R; radius of a horizontal roll, and in any case the unit is mm.. In the material to be rolled, on the other hand, the width spreading quantity DELTAW1 of the material after rolling and its crop quantity DELTAL1 are predicted by using the formulas V, VI. The width spreading quantity DELTAWF and crop length DELTALF of the final product are predicted by combining the formulasIIV with the formulas V, VI, and the optimum conditions are obtained so that said predicted values coincide with the width spreading quantity DELTAWC and the crop length DELTALC of the final product. Thus the rolling is performed in this optimum condition. |
