板坯头/尾部平面形状对铝合金厚板粗轧头尾切除量的影响

Effects of head and end plane shape of slab on metal removal of head and tail in aluminum alloy plate rough rolling

为降低铝合金厚板粗轧头尾切除量,提高热轧铝板成材率,以5052铝合金材料为对象,基于DEFORM商用软件,利用刚塑性有限元方法模拟板厚和压下量对头尾鼓形深度的影响规律,建立头尾切除量定量预测模型。以此为基础,开展多道次可逆轧制过程中头/尾部普通平面、圆弧平面、梯形平面下的轧件头尾切除量演变规律探究,结果表明:圆弧平面与梯形平面能减少头尾切损约18%~20%。普通平面的头尾切除量预测模型已应用于实际轧制规程,预测结果和现场实测情况吻合,验证了有限元模拟结果的正确性。综合考虑铸锭的端面铣削工艺,梯形平面更有利于现有铝合金厚板热轧生产。

In order to reduce the metal removal of head and tail and improve the hot rolled aluminum plate yield, taking 5052 aluminum alloy as an object, the effects of strip thickness and rolling reduction on metal removal of head and tail were simulated and the prediction model of head and tail was precisely established. Then the head and tail evolution rules were studied under the conditions of general plane shape, circular plane shape and trapezoidal plane shape of the slab head and end in the process of multi pass reversing rolling. The results show that the cropping is reduced by 18%-20% under the condition of circular and trapezoidal cross-section. In order to testify the correctness of finite element simulation results, the prediction model of head and tail under the condition of general plane shape is applied to the actual rolling schedule, and the prediction results are consistent with the in-site measurement data. Considering the milling process of ingot end face, the trapezoidal plane shape is more suitable for the hot rolling production of aluminum alloy thick plate at this stage.