锻压技术

铝合金轮毂等温锻造成形中不均匀润滑的数值模拟和实验分析

英文标题：Numerical simulation and experimental analysis of uniform lubrication in isothermal die forging of aluminum alloy wheels

作者：叶升平陈康华陈送义

单位：中南大学

关键词：轮毂等温锻造不均匀润滑有限体积法

分类号：TG312

出版年,卷(期):页码：2014,39(2):6-11

摘要：

通过采用有限体积法(FVM),在MSC.Superforge有限元商业软件上实现了铝合金轮毂等温模锻成形的数值模拟，并进行了铝合金轮毂等温模锻成形实验。研究发现，轮毂锻件成形规律在数值模拟与实验中不一致，将数值模拟与实验进行分析可知, 模拟实验中加强筋上对应的轮缘为凹形，即加强筋上方金属晚于其他区域成形；而实际实验中加强筋上对应的轮缘为凸形，即加强筋上方金属早于其他区域成形。在计算机上获得了锻件与模具接触判定和潜在润滑凹槽值,可以推断轮毂成形过程中，加强筋处未充满的间隙形成封闭腔室，受到成形金属的排斥作用，润滑剂更易向加强筋流动，造成了数值模拟与实验中金属流动规律的差异。

The finite volume method (FVM) was used for numerical simulation of isothermal forging process of aluminum alloy wheels in commercial software MSC.Superforge, and the physical forming experiment was performed. Study releases that the forging laws in numerical simulation and physical experiment are inconsistent. According to the analysis of numerical simulation and physical experiment, it shows that the rim corresponding to stiffener is concave in numerical simulation, namely forming of rib area is later than other regions,while, the rim corresponding to stiffener is convex in physical experiment, namely forming of rib area is faster than other regions. According to the die contact and possible lubricant pockets obtained by the numerical simulation, the enclosed chamber formed in underfill gap of reinforcing rib was deduced in the wheel molding process which leads to repulsion by forming metal and more easily flow to stiffener for lubricant, so it brings about the difference of metal flow between numerical simulation and actual experiment.

基金项目：

国家973基础研究计划资助项目(2010CB731701,2012CB619502)

叶升平（1988-），男，硕士研究生

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