T-shape upsetting-extruding test for evaluating friction conditions during rib-web part forming
T-shape upsetting-extruding test for evaluating friction conditions during rib-web part forming
复制标题
T 形镦粗挤压试验，用于评估肋腹板零件成形过程中的摩擦条件
DOI：
10.1016/j.jmatprotec.2014.04.021
复制
发表时间：
2014-11-01
影响因子：
6.3
通讯作者：
Li, J. J.
中科院分区：
文献类型：
--
作者：
Deng, L.;Li, X. T.;Li, J. J.
由于现有摩擦测试方法的变形特征与筋腹件闭式模锻过程的变形特征不太相似，因此这些方法评估的摩擦条件与实际情况不相符。本文提出了一种新的摩擦测试方法，即采用矩形毛坯的T形镦粗挤压工艺，用于评估肋腹板零件成形过程中的摩擦条件。研究发现，肋的高度和幅材的宽度都对摩擦条件敏感。因此，选择肋高度与腹板宽度之比作为摩擦评价的标准。利用商业有限元程序DEFORM，研究了几何参数和测试变量对摩擦灵敏度的影响，并分析了不同界面之间的摩擦条件。为了验证所提出的方法，采用三种不同方法（所提出的方法、环压缩试验和双杯挤压试验）测量的水基石墨润滑剂在723 K下的摩擦因数来模拟横肋零件的等温变形过程。实验结果表明，对于筋腹板零件的成形过程，该方法比其他两种方法更准确。 (C) 2014 Elsevier B.V. 保留所有权利。
Since the deformation features of existing friction testing methods are not as similar as those of the closed die forging process of rib-web parts, the friction conditions evaluated by these methods are not consistent with the actual situation. In this paper, a new friction testing method, the T-shape upsetting-extruding process employing a rectangular blank, is proposed for evaluating the friction conditions during rib-web part forming process. It was found that rib height and the web width are both sensitive to friction conditions. Therefore, the ratio of rib height to web width was chosen as a criterion for friction evaluation. With the utilization of a commercial FEM program, DEFORM, the effects of the geometrical parameters and testing variables on the friction sensitivity were investigated, and the friction conditions between different interfaces were analyzed. In order to verify the proposed method, friction factors of a water-based graphite lubricant measured by three different methods (the proposed one, the ring compression test and the double-cup extrusion test) at 723 K were used to simulate the isothermal deformation process of a cross-rib part. The experimental results suggest that the proposed method is more accurate than the other two methods for rib-web part forming process. (C) 2014 Elsevier B.V. All rights reserved.