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在超高强度钢板热冲压成形工艺中,能准确预测板料的温度场与模具的受力状况,对工艺制定与模具的优化具有重要意义。通过ABAQUS模拟软件建立塑性体热力耦合有限元模型,对热冲压过程进行模拟仿真,分析板料与模具的温度场以及模具所受的作用力。研究结果表明:板料转移时间控制在10 s内较好;在成形过程中,制件法兰与侧壁部分温度分布均匀且基本一致,制件法兰与侧壁部分的温度低于制件底部部分的温度;为保证模具强度,凸模圆角处及底部、凹模入口圆角处及底部的冷却水道直径及密度应较小,并且应适当增大水道与底部表面的距离。
In the hot stamping forming process of ultrahigh strength steel plate, the temperature field of sheet metal and the force condition of the mold can be accurately predicted, which is of great significance for process formulation and mold optimization. Through the ABAQUS simulation software, the thermomechanical coupled finite element model of plastic body was established. The hot stamping process was simulated and analyzed. The temperature field of sheet metal and mold and the force of the mold were analyzed. The results show that the sheet transfer time is controlled within 10 s. During the forming process, the temperature distribution of the flange and the sidewall of the workpiece is uniform and basically the same. The temperature of the flange and sidewall of the workpiece is lower than that of the workpiece The bottom part of the temperature; in order to ensure the mold strength, punch fillet and the bottom of the die entrance fillet and cooling channel at the bottom of the diameter and density should be small, and should be appropriate to increase the distance between the waterway and the bottom surface.