Study on the Influence of Process Parameters of Large T-Shape Tube Hydroforming with Finite Element Method

利用有限元素法對大型三通管液壓成形製程參數影響之研究

李文忠(Wen-Chung Lee) ； 管金談(Chin-Tarn Kwan)

《中國機械工程學刊》 30卷6期 (2009/12) Pp. 527-532

https://doi.org/10.29979/JCSME.200912.0010

摘要

本文針對10”大型三通管液壓成形製程參數對擠出頂端圓角半徑影響之研究。對於大型三通管，為節省材料，總希望擠出頂端之圓角半徑越小越好，以使第三孔端部之切除量儘量短，然而成形時若要擠出頂端圓角半徑較小，則液壓壓力就需較高，但是過高的液壓壓力會使管壁變薄，致使製品不符合工業上的壁厚要求。本文研究液壓加壓路徑及頂缸對軸向衝頭行程之關係路徑二個製程參數對成形品擠出頂端圓角半徑及最小壁厚的影響，並探討出能使製品壁厚符合要求且擠出頂端圓角半徑較小的製程參數。

並列摘要

In this paper, the finite element method is used to investigate the cold hydroforming process of a large T-shape tube. The largest nominal diameter of such a tube is 12in in Taiwan. In order to save the volume of tube billet for hydroforming a large T-shape tube, the corner radius at the top of the protrusion of formed tube should be minimized for short trimming the top of the protrusion. Although a higher hydroforming pressure could lead the corner radius smaller, it could also lead the tube thickness become thinner, so that the formed tube could be an unqualified product. A series of simulations on hydraulic expansion, axial feeding and the counter backing of the tubes was carried out using the DEFORM-3D program. The influence of the process parameters such as the internal pressure paths and the counter paths on the minimum wall thickness and the corner radius of formed tube are examined. A suitable range of the process parameters for producing an acceptable T-shape tube that fulfils the industrial demand and having smaller corner radius was also found.

並列關鍵字

finite element simulation ； t-shape tube ； tube hydroforming