【作者】 黄倩影；

【导师】 骆俊廷；

【作者基本信息】 燕山大学 ， 材料加工工程， 2012， 硕士

【摘要】 板料软模成形工艺是近年来材料成形领域的研究热点之一。在传统软模工艺的基础上，提出了颗粒或可压缩粉末软凹模板材成形新工艺，对筒形件拉深成形进行了理论分析、对成形过程中颗粒的运动规律进行了探讨，在此基础上设计了成形模具并进行了试验研究。论文制定了筒形件颗粒或可压缩粉末软凹模成形工艺，在对筒形件颗粒或可压缩粉末软凹模拉深成形提出基本假设的基础上，对该成形工艺进行了力学分析，并将其与刚性模具成形工艺进行对比，分析了筒形件成形过程中各变形区域的应力应变状态及数值大小，推导出了变形时与颗粒或可压缩粉末接触区域的应力和应变的计算公式，理论分析结果证明了颗粒或可压缩粉末软凹模成形工艺有利于防止成形零件缺陷的产生，提高板材的成形极限。采用Marc有限元软件，对颗粒的运动规律进行了有限元数值模拟，并对筒形件颗粒软凹模拉深成形过程中颗粒的运动过程进行了物理模拟。在数值模拟与物理试验模拟研究的基础上，得到了颗粒软凹模成形过程中颗粒运动的基本规律，建立了板料颗粒软凹模成形颗粒运动的分区模型，为该工艺的实际应用提供理论依据。对筒形件颗粒软凹模成形工艺进行了试验研究，并对试验结果与理论计算进行了对比分析，进一步验证了该工艺的可行性及理论分析的正确性。对筒形件颗粒软凹模成形以及刚性拉深成形工艺进行了有限元模拟，得到了底部区、圆角区、筒壁区的应力应变曲线，并将其与理论计算进行了对比分析，进一步验证了理论推导的正确性。更多还原

【Abstract】 In recent years, flexible die forming for sheets is one of the lightspot in the materialforming field. Based on traditional flexible die forming technologies, the new granules orpowder felxbile cavity forming technology is presented by author in this paper. The theoryanalys was accomplished for deep drawing forming of cup shell, the motion law ofgranules was discussed in the forming process, and on the basis of these, forming die wasdesigned and experimental investigation was carried out.The mechanics analysis is finished. The stress and strain state of forming parts isanalyzed and values are calculated compared with common rigid die forming based on thefundamental assumptions. The theory equations are obtained for calculating the value ofstress and strain. The theoretical analysis results prove that the forming limit can beimproved and defects can be prevented when parts are formed by granules or powderflexible cavity forming technology.The motion law of granules was analyzed by the finite element simulation software,and the physical simulation of granule movement regularity was implied for granulescavity deep drawing technology of cup shell an example. In base of simulation andexperimental investigation, basic regularities of granules movement were acquired, andmovement zone model was established also. The analysis of granules movementregularities and the establishing of movement zone model can present theoretical supportfor application of granules or powder flexible cavity forming technology.Experiment was carried out for deep drawing of cup shell by granules flexbile cavityforming technology. Experimental results were compared with that of theoretical analysis.The feasibility of technology and the correctness of the theory analysis were furthervalidated. By the finite element simulation，granules flexbile cavity forming and rigidityforming of cup shell were analyzed and stress and strain of bottom area, round area, andlateral area were got. The correctness of theoretical analysis was further validated bysimulate results.更多还原