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为提高预弯段的成形精度,建立了侧辊位移量与预弯段成形半径的四辊预弯数值模型。采用有限元软件分析了滚弯变形区应力应变场的演变规律、轧辊与板材间的摩擦力对滚弯成形的影响,以及多道次滚弯成形后,板材表面塑性应变场的变化规律。四辊多道次滚弯试验表明,四辊预弯数值模型和有限元模型的成形半径比试验结果小,误差分别为11.2%和6.3%;板材与轧辊间的摩擦力是导致预弯段成形半径小于连续滚弯段成形半径的重要原因;多道次滚弯加工后,预弯段成形半径相对于连续滚弯段成形半径的误差,由单道次滚弯加工时的7.3%降至1.7%,预弯段的成形精度得到有效提高。
In order to improve the forming accuracy of the pre-bending section, a four-roll pre-bending numerical model was established for the displacement of the side roll and the radius of the pre-bending section. The evolution of stress and strain field in rolling deformation zone, the influence of friction between roll and plate on roll forming, and the variation of plastic strain field on the surface of plate after multi-pass roll forming were analyzed by finite element software. Four-roll multi-pass rolling test shows that the forming radius of the four-roll pre-bending numerical model and the finite element model are smaller than the experimental ones with the errors of 11.2% and 6.3% respectively. The friction between the plate and the roll is the result of pre-bending The radius is smaller than that of the continuous roll bending radius. The error of the preform bending radius relative to the continuous radius bending radius after multi-pass roll reduction is reduced from 7.3% of single roll roll bending to 1.7 %, Pre-curved section of the forming accuracy is effectively improved.