An investigation of the forming mechanisms of curved bars and twisted bars by extrusion through a die aperture with asymmetric cross section

不对称截面模孔挤压弯棒材和扭棒材成形机理的研究

• 批准号: 17560110
• 负责人: KIHARA Shigefumi
• 金额: $ 1.92万
• 依托单位: Takamatsu National College of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560110/
• 关键词: Extrusion; Simulation; Finite Element Analysis; Deformation Mechanism; Curved rectangular Bar; Curved rectangular Pipe; 湾曲矩形棒; 湾曲矩形管; 前方押出し

The mechanisms responsible for the forming of rectangular bars and trapezoidal bars by extrusion at a fixed angle through a die aperture were investigated using numerical simulations. The greater the die inclination angle or the greater the aperture exit angle, the smaller the radius of curvature of the exiting bar. The calculated radius of curvature agreed well with the radius observed in experiments. The particle flow pattern, one of the outputs of the simulation, was used as a basis to investigate the mechanisms of curvature generation. When the die inclination angle was increased in the case of extrusion of rectangular bars, the volume of dead metal increased, causing material flow in the plane perpendicular to the extrusion direction. This gave rise to curvature in the extruded bar. It was also found that when the cross section was trapezoidal, the asymmetry of the container aperture caused differences in material flow velocity between the top and bottom portions; those differences affected curvature.

采用数值模拟的方法研究了矩形棒材和梯形棒材在固定角度下通过口模孔挤压成形的机理。模具倾斜角越大或孔出口角越大，出口杆的曲率半径越小。计算的曲率半径与实验观察到的半径吻合得很好。粒子流模式是模拟的输出之一，被用作研究曲率产生机制的基础。在挤压矩形棒材时，当模具倾斜角度增加时，死金属的体积增加，导致材料在垂直于挤压方向的平面内流动。这导致了挤压棒的弯曲。还发现，当横截面为梯形时，容器孔的不对称性引起顶部和底部之间的材料流速的差异;这些差异影响曲率。

项目成果

Analysis of Shaped Bars with Various Curvatures Using Extrusion Process through Inclined Die

斜模挤压工艺对不同曲率异形棒材的分析

• 发表时间: 2007
• 期刊: Journal of the JAPAN SOCIETY TECHNOLOGY of PLASTICITY Vol.48 No.552
• 作者: 水野顕;本田知己;岩井善郎;安丸尚樹;木原茂文;Shigefumi KIHARA
• 通讯作者: Shigefumi KIHARA

ダイス傾斜押出し加工法による湾曲矩形棒の成形解析

凹模倾斜挤压法弯曲矩形棒材成形分析

• 发表时间: 2007
• 期刊: 塑性と加工 第48巻第552号
• 作者: 水野顕;本田知己;岩井善郎;安丸尚樹;木原茂文
• 通讯作者: 木原茂文