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基于MSC.Marc软件平台,建立了含SiCP体积分数为12%的SiCP/2024Al复合材料热挤压轴对称刚-塑性热力耦合有限元分析模型。利用该模型对复合材料的热挤压过程进行模拟,分析了热挤压过程中的载荷-行程曲线和材料流动状态,讨论了模具温度及挤压速度对挤压载荷的影响。模拟结果表明,该坯料在挤压比为30∶1、挤压温度为400~450℃、挤压速度为0.1~1.0 mm/s、挤压载荷为4.0×106~5.0×106N之间能够顺利挤出表面无缺陷的复合材料棒材。最后通过在700 t水压机上采用相同工艺挤出高质量的复合材料棒材验证该工艺的可行性。
Based on the MSC.Marc software platform, the axial symmetry rigid-plastic coupling finite element model of SiCP / 2024Al composite with SiCP volume fraction of 12% was established. The model was used to simulate the hot extrusion process of composite materials. The load-stroke curve and material flow state during hot extrusion were analyzed. The effects of mold temperature and extrusion speed on extrusion load were discussed. The simulation results show that the billet can be smoothly processed with the extrusion ratio of 30:1, the extrusion temperature of 400-450 ℃, the extrusion speed of 0.1-1.0 mm / s and the extrusion load of 4.0 × 106-5.0 × 106N Extrude a defect-free composite rod. Finally, the feasibility of this process was verified by extruding high quality composite rods using the same process on a 700 t hydraulic press.