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针对BJ型钟形壳零件的温-冷联合成形工艺,即下料—挤杆—镦头—反挤压—精整—冷减径工艺,进行了数值模拟研究。重点对钟形壳温锻反挤压工步成形的材料分配及流动规律、温度场、载荷曲线进行了数值模拟分析,得到了有利于材料流动的合理的模具结构,优化的反挤压成形温度为700~900℃,反挤压工步成形力为9000 kN。以上数据为钟形壳精密锻造及模具制造和设计提供了理论依据。
Aiming at the temperature-cold joint forming process of BJ-type bell-shaped shell parts, that is, the cutting-extrusion-heading-extrusion-finishing-cooling reduction process, the numerical simulation was carried out. Focusing on the material distribution and flow law, temperature field and load curve of bell-shaped shell warm forging process, the reasonable mold structure which is favorable to material flow was obtained, and the optimum extrusion temperature 700 ~ 900 ℃, anti-extrusion step forming force of 9000 kN. The above data provide a theoretical basis for bell-shaped shell precision forging and mold manufacturing and design.