Abstract
In this paper, the extrusion process of titanium seamless tubes was studied using several finite element (FE) analyses. First, the finite element result was compared with experimental extrusion data acquired to validate the current analysis. Then, the effect of design parameters of the die shape was numerically analyzed using commercial FE software, Forge NxT, for the metal forming process. Elastic FE analyses were also conducted for dies to analyze the maximum principal stress that affects the early fracture of dies during the extrusion process and the maximum von Mises stress that causes the severe deformation of dies. Consequently, the effect of the corner radius at the exit and land length on the extrusion load and die stress is negligible compared to that of the corner radius at the entrance and die angle. Finally, we suggested a die angle of 60° and a corner radius at the die entrance between 10 and 15 mm as an optimal design for the current extrusion process.
Highlights
Titanium tube is widely used for industrial applications such as desalination plants due to its high resistance to heat and corrosion [1]
Elastic finite element (FE) analyses were conducted for dies to analyze the maximum principal stress that affects the early fracture of dies during the extrusion process and the maximum von Mises stress that causes the severe deformation of dies
It is known that the formation of dead metal zone (DMZ) during extrusion disturbs the fl of material and causes an increase in the extrusion load, and it is affected by die ang the local strain of the billet according to the die angle at the initial peak and the end of extrusion is shown in Figure 6a,b, respectively
Summary
Titanium tube is widely used for industrial applications such as desalination plants due to its high resistance to heat and corrosion [1]. Gattmah et al [18] investigated the effect of process parameters on the hot extrusion of the hollow aluminum tubes by finite element analysis. They concluded that the surface temperature is increased with increasing ram displacement, friction coefficient, and reduction in area and decreased gradually at the exit of the die due to heat transfer within the surrounding environment. Hansson and Jansson [13] analyzed the tube extrusion of stainless steel after induction heating by using finite element analysis They successfully predict the load– displacement curves and derived the optimal design to lower the extrusion load. An optimal design of dies was suggested for the current extrusion process
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