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基于ABAQUS/Explicit有限元平台对7075铸造铝合金筒形件强力热反旋成形进行数值模拟,分析减薄率、预热温度对筒形件旋压成形过程中喇叭口缺陷的影响。结果表明,减薄率为20%、预热温度为300℃时,工件壁厚减薄均匀且内壁保持贴模;减薄率为30%、预热温度为325℃时,工件出现明显的喇叭口现象,扩径度最大,达5.35%。综合分析表明,最佳工艺参数为减薄率20%、预热温度300℃。
Based on the ABAQUS / Explicit finite element analysis platform, the hot forming process of 7075 cast aluminum alloy cylindrical parts was numerically simulated. The influence of the thinning ratio and the preheating temperature on the flare defects during the forming process of cylindrical parts was analyzed. The results show that when the thinning rate is 20% and the preheating temperature is 300 ℃, the wall thickness of the workpiece is reduced and the inner wall is kept close to the mold. When the thinning rate is 30% and the preheating temperature is 325 ℃, Kou phenomenon, expanding the largest diameter of up to 5.35%. Comprehensive analysis shows that the optimum process parameters are thinning rate 20%, preheating temperature 300 ℃.