提出了一种基于各道次载荷近平均分配下的辊锻模具正向分步修正方法。首先,基于辊锻模具参数化设计系统,设计初始辊锻模具三维造型;随后,利用有限元模拟获取各道次载荷分布数据,分析不同道次之间的平均载荷差距。对于平均载荷较小的辊...提出了一种基于各道次载荷近平均分配下的辊锻模具正向分步修正方法。首先,基于辊锻模具参数化设计系统,设计初始辊锻模具三维造型;随后,利用有限元模拟获取各道次载荷分布数据,分析不同道次之间的平均载荷差距。对于平均载荷较小的辊锻模具,采用增大相应道次的变形量的方法提升其成形载荷,以此作为修正初始模具型槽尺寸的依据;最后,利用有限元模拟反复迭代更新模具型槽尺寸。将该方法运用于某汽车前轴的辊锻模具设计过程中,结果表明,仅采用二次修正后得到各道次平均载荷的最大差距由701 k N减小至156 k N,减幅达4倍多,说明所提出的辊锻模具正向分步修正方法是可靠且有效的。展开更多
To further investigate the forming mechanism and springback characteristics of strips under multi-square punch forming (MSPF) considering partial-unloading effects, a series of concave form ing tests of strips are con...To further investigate the forming mechanism and springback characteristics of strips under multi-square punch forming (MSPF) considering partial-unloading effects, a series of concave form ing tests of strips are conducted on the MSPF machine. This paper aims to reveal the physical mecha nism of the elastic-plastic deformation in the MSPF process considering the effect of the forming ap proaches, and derive appropriate mathematical interpretations. The theoretical model is firstly estab lished to analyse the concave forming mechanism and springback characteristics of the strip, and its accuracy is then validated by experimental data. The forming history and load evolutions are depicted to explore the required forming capacity through the proposed analytical method. Besides, the paramet ric studies are carried out to discuss their effects on the springback of the strip. The results suggest that the deformation paths of the strip are influenced by the forming approach, and the springback of the strip in convex forming is larger than that in concave forming.展开更多
文摘提出了一种基于各道次载荷近平均分配下的辊锻模具正向分步修正方法。首先,基于辊锻模具参数化设计系统,设计初始辊锻模具三维造型;随后,利用有限元模拟获取各道次载荷分布数据,分析不同道次之间的平均载荷差距。对于平均载荷较小的辊锻模具,采用增大相应道次的变形量的方法提升其成形载荷,以此作为修正初始模具型槽尺寸的依据;最后,利用有限元模拟反复迭代更新模具型槽尺寸。将该方法运用于某汽车前轴的辊锻模具设计过程中,结果表明,仅采用二次修正后得到各道次平均载荷的最大差距由701 k N减小至156 k N,减幅达4倍多,说明所提出的辊锻模具正向分步修正方法是可靠且有效的。
文摘To further investigate the forming mechanism and springback characteristics of strips under multi-square punch forming (MSPF) considering partial-unloading effects, a series of concave form ing tests of strips are conducted on the MSPF machine. This paper aims to reveal the physical mecha nism of the elastic-plastic deformation in the MSPF process considering the effect of the forming ap proaches, and derive appropriate mathematical interpretations. The theoretical model is firstly estab lished to analyse the concave forming mechanism and springback characteristics of the strip, and its accuracy is then validated by experimental data. The forming history and load evolutions are depicted to explore the required forming capacity through the proposed analytical method. Besides, the paramet ric studies are carried out to discuss their effects on the springback of the strip. The results suggest that the deformation paths of the strip are influenced by the forming approach, and the springback of the strip in convex forming is larger than that in concave forming.
