关键参数对薄壁筒形件充液成形的影响规律

发布时间：2018-04-01 06:38

本文选题：初始反胀　切入点：数值模拟　出处：《锻压技术》2017年12期

【摘要】：为了研究初始反胀高度(IRBH)、反胀压力(IRBP)和液室压力加载路径3个工艺参数对板料充液成形的影响规律,以不锈钢321材料为研究对象,进行板材充液成形工艺过程的分析。首先,利用数值模拟的方法,在有初始反胀(IRB)的充液成形基础上,研究了初始反胀高度与初始反胀压力的组合形式以及液室压力加载路径对制件成形的影响规律,然后分别研究了有无初始反胀的充液成形过程。最后,通过实验的方法进行验证。结果表明:当初始反胀高度为3.75 mm、初始反胀压力为2 MPa时,充液结束时板料的最大减薄率为4.803%,在所有结果中最小;无初始反胀时,零件壁厚最大减薄率为5%;当在充液拉深后期继续加大液室压力时,板料底部发生波动,出现二次变形,与此同时,板料最大减薄率增大。从而验证了合适的初始反胀高度和反胀压力可以减小制件壁厚的最大减薄率,液室压力加载路径不同,零件的壁厚分布也不同。
[Abstract]:In order to study the influence of three process parameters, the initial reverse expansion height (IRBH), the reverse expansion pressure (IRBP) and the pressure loading path of the liquid chamber, on the forming process of sheet metal filled with liquid, the process of sheet metal filling was analyzed with stainless steel 321 as the research object.Firstly, based on the method of numerical simulation, the combined form of initial reverse expansion height and initial reverse expansion pressure and the influence of the pressure loading path of the chamber on the forming of the workpiece are studied on the basis of the liquid filling forming with the initial reverse expansion (IRB).Then the liquid-filling forming process with or without initial reverse expansion is studied respectively.Finally, the method of experiment is used to verify.The results show that when the initial reverse expansion height is 3.75 mm and the initial reverse expansion pressure is 2 MPa, the maximum thinning rate of the sheet metal at the end of the filling is 4.803, which is the smallest in all the results, and when there is no initial reverse expansion,The maximum thinning rate of the part wall thickness is 5. When the pressure of the liquid chamber continues to increase in the later stage of liquid filling, the bottom of the sheet metal fluctuates and the second deformation occurs. At the same time, the maximum thinning rate of the sheet metal increases.It is proved that proper initial reverse expansion height and reverse expansion pressure can reduce the maximum thinning rate of the wall thickness of the workpiece, and the distribution of the wall thickness of the parts is different with the different pressure loading paths of the liquid chamber.
【作者单位】：北京航空航天大学机械工程及自动化学院;
【基金】：国家科技重大专项:“高档数控机床与基础制造装备”(2014ZX04002-071)
【分类号】：TG306

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