The Finite Element Analysis of Tube Hydroforming Processes
Date Issued
2004
Date
2004
Author(s)
Zhan, Way-Rome
DOI
zh-TW
Abstract
Tube hydroforming is a manufacturing process to form desired component shapes by fluid pressure which is applied ductile metallic tube blanks. This takes low cost, low mass and can retrench materials, even improve structural performance. Hence, tube hydroforming is one of the technologies that car companies investigate aggressive.
Because the material properties are required in computer simulations, tube material properties are investigated in the present study. Tensile tests from the tube are not easy to obtain. However, in order to predict the tube material properties, the simple model is established. The experimental results reveal that strain hardening during the tube-rolling process is higher than the computer simulation. Nevertheless, the computer simulation is the least strain hardening during the tube-rolling process. Besides, after the offset of tube materials, the stress curve can overlap tube materials and original materials. It reveals that the failure point is the same. As the material strain hardens, it gets nearer to its failure point.
Computer simulation is used to prove the formability formula. The results of the formability formula show higher forming pressure than exact forming pressure. According to the above results, the phenomenon of under-fill will not happen in the application because the calculated value is higher than the right value. The formula can be used in application.
The formability formula can estimate the forming pressure and the holding force since it is proved the precision. The designer can decide the hydraulic system and hydraulic press from the calculation in the initial stage.
The overall requirements for the simulation of tube hydroforming are fully discussed in the present study. From the simulation, the defects are also investigated.
Furthermore we also create some design guidelines for the designers who want to investigate the technology of tube hydroforming.
Because the material properties are required in computer simulations, tube material properties are investigated in the present study. Tensile tests from the tube are not easy to obtain. However, in order to predict the tube material properties, the simple model is established. The experimental results reveal that strain hardening during the tube-rolling process is higher than the computer simulation. Nevertheless, the computer simulation is the least strain hardening during the tube-rolling process. Besides, after the offset of tube materials, the stress curve can overlap tube materials and original materials. It reveals that the failure point is the same. As the material strain hardens, it gets nearer to its failure point.
Computer simulation is used to prove the formability formula. The results of the formability formula show higher forming pressure than exact forming pressure. According to the above results, the phenomenon of under-fill will not happen in the application because the calculated value is higher than the right value. The formula can be used in application.
The formability formula can estimate the forming pressure and the holding force since it is proved the precision. The designer can decide the hydraulic system and hydraulic press from the calculation in the initial stage.
The overall requirements for the simulation of tube hydroforming are fully discussed in the present study. From the simulation, the defects are also investigated.
Furthermore we also create some design guidelines for the designers who want to investigate the technology of tube hydroforming.
Subjects
壓模力
板件液壓成形
成形壓力
液壓成形
未填滿
加工硬化值
管件液壓成形
strain hardening
hydroforming
sheet metal hydroforming
holding force
under fill
forming pressure
Type
thesis