上限分析法预测棒材在挤压过程中的中心开裂缺陷（英文）

发布时间：2018-01-25 14:26

本文关键词： 中心开裂缺陷上限分析法棒材挤压工艺　出处：《Transactions of Nonferrous Metals Society of China》2016年11期 　论文类型：期刊论文

【摘要】：采用上限分析法对棒材在圆锥形模具中挤压时的中心开裂缺陷进行预测,提出了一个包括径向速度和角速度分量的运动许可速度场,提出了一个新的预测中心开裂缺陷产生的标准,并提出了一个表示开裂程度的参数b_(obt)。通过最小化挤压过程中总功率耗散,采用入口处的边界形状来计算参数b_(obt)。当b_(obt)≥bcr时发生中心开裂现象。此外,研究了中心开裂缺陷与挤压过程参数(模具半锥角、面积减小率和摩擦因数)的关系。结果表明:棒材的中心开裂缺陷主要受面积减小率和摩擦因数的影响。将本文作者所提出的方法与FEM模拟数据及已有文献数据进行了比较。
[Abstract]:The upper bound analysis method is used to predict the central crack defect of bar during extrusion in conical die, and a motion velocity field including radial velocity and angular velocity component is proposed. A new standard for predicting the occurrence of central cracking defects is proposed, and a parameter, bsp / obtl, which indicates the degree of cracking, is proposed. The total power dissipation is minimized during extrusion. The boundary shape of the entrance is used to calculate the parameter bsp / obt.The central cracking occurs when the bcr is more than or equal to b\\ +\\ {{-}\}. In addition. The central cracking defects and extrusion process parameters (die semi-cone angle) were studied. Area reduction and friction factor). The results show that the central crack defect of the bar is mainly affected by the area reduction rate and friction coefficient. The method proposed in this paper is compared with the FEM simulation data and the existing literature data.
【作者单位】： Mechanical
【分类号】：TG376.8
【正文快照】： 1 Introduction Nowadays,the extrusion process is widely used in the production of industrial components,therefore,concentrating on the final quality of the parts produced by this process is very important.Internal central bursts,which are also called Ch

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