Interfacial structure and bonding mechanism of weld seams during porthole die extrusion of aluminum alloy profiles

2018 ◽  
Vol 138 ◽  
pp. 56-66 ◽  
Author(s):  
Junquan Yu ◽  
Guoqun Zhao
Keyword(s):  
Aluminum Alloy ◽  
Interfacial Structure ◽  
Bonding Mechanism ◽  
Porthole Die ◽  
Structure And Bonding ◽  
Die Extrusion ◽  
Porthole Die Extrusion ◽  
Weld Seams

An optimizing process of profiled cross-sectional aluminum alloy porthole die extrusion using response surface methodology

2016 ◽  
Vol 30 (08) ◽  
pp. 1650098 ◽  
Author(s):  
Fujian Zhou ◽  
Feng Li ◽  
Liansheng Shi ◽  
Hongwei Jiang
Keyword(s):  
Aluminum Alloy ◽  
Friction Factor ◽  
Cross Section ◽  
Ultimate Load ◽  
Initial Temperature ◽  
Extrusion Process ◽  
Extrusion Speed ◽  
Porthole Die ◽  
Die Extrusion ◽  
Porthole Die Extrusion

The porthole die extrusion process of profiled cross-section hollow aluminum alloy is influenced by numerous factors, which brings inconvenience to the process design. In this paper, 7075 aluminum alloy is taken as an example, the fitting model of the ultimate load is analyzed by variance and regression analysis using response surface method (RSM). The influences of extrusion speed, friction factor and initial temperature on the change of extruded ultimate load are investigated systematically, and the important influence factors (initial temperature [Formula: see text] friction factor [Formula: see text] extrusion speed) to the load are determined eventually. By comparison, the error between the ultimate load model obtained after fitting and the calculated value is only 2.4%, further verifying the reliability of this model. The optimal objective is to minimize the ultimate load, then the optimum technological parameters are obtained by optimizing the process, where the initial temperature, the extrusion speed and the friction factor are 430[Formula: see text]C, 2.28[Formula: see text]mm/s and 0.31, respectively. The results provide a theoretical basis for the scientific design of the porthole die extrusion process of profiled cross-section hollow aluminum alloy.

FEM simulation of welding quality in porthole die extrusion

2011 ◽  
Vol 26 (2) ◽  
pp. 292-295 ◽  
Author(s):  
Youfeng He ◽  
Shuisheng Xie ◽  
Lei Cheng ◽  
Guojie Huang ◽  
Yao Fu
Keyword(s):  
Fem Simulation ◽  
Welding Quality ◽  
Porthole Die ◽  
Die Extrusion ◽  
Porthole Die Extrusion

3D FEM-NEM Material Joining Simulation in Porthole Die Extrusion

2011 ◽  
Vol 491 ◽  
pp. 151-158 ◽  
Author(s):  
Francesco Gagliardi ◽  
I. Alfaro ◽  
Luigino Filice ◽  
E. Cueto
Keyword(s):  
Finite Element ◽  
Complex Geometry ◽  
Experimental Investigations ◽  
3D Analysis ◽  
3D Fem ◽  
Positive Effects ◽  
Tube Extrusion ◽  
Porthole Die ◽  
Die Extrusion ◽  
Porthole Die Extrusion

The conventional tube extrusion process has been substituted by porthole die extrusion due to relevant advantages in terms of productivity and quality. However, the porthole die has a complex geometry to be effectively designed; consequently, several studies can be found out in the technical literature based on experimental and finite element analyses of the process. From this point of view, while the experimental investigations entail cost and time increasing, due to the die building complexity, finite element techniques present some drawbacks such as the difficulty to simulate material joining and the loss of accuracy due to the heavy mesh distortion and related remeshing. Therefore, the introduction of new numerical techniques for the analyses of this process could have positive effects. In this paper, the Natural Element Method (NEM) together to the alpha shapes and some extra numerical procedures are used in the simulation of tube extrusion, focusing the attention on the simulation of the welding line in a fully 3D analysis. The obtained results are compared with the finite element and experimental ones, measuring the accuracy of the proposed methodology.

Effects of Process Parameters on Charge Weld Length during Multi-Hole Porthole Die Extrusion

2014 ◽  
Vol 703 ◽  
pp. 141-145 ◽  
Author(s):  
Liang Chen ◽  
Guo Qun Zhao ◽  
Ting Ting Wang
Keyword(s):  
Finite Element ◽  
Process Parameters ◽  
Optimal Process ◽  
Extrusion Speed ◽  
Billet Temperature ◽  
Porthole Die ◽  
Element Simulation ◽  
Die Extrusion ◽  
Charge Weld ◽  
Porthole Die Extrusion

The evolution of charge weld during multi-hole porthole die extrusion was studied by means of finite element simulation and Taguchi’s design. Moreover, based on S/N analysis, the optimal process parameters that can reduce the charge weld length was obtained, where the billet diameter is 100 mm, extrusion speed is 2.0 mm/s, tool temperature is 430 °C and billet temperature is 465 °C. The accuracy and effectiveness of such optimal process parameters were also verified. The purpose of the present study is to provide some information about the controlling of charge weld for extrusion engineers.

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