The investigate of White and Black Lines Defect for Hot Extrusion Die Process of Hollow Aluminum Profiles by Finite Element Method
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Abstract
The black and white lines defect in the aluminum extruded profile is one of the problems that lead to the reject of the product by the customers, especially after it has been treated with the anodized procedure. This research experimented with three methods to reduce the black and white lines defect by using the finite element method (FEM) and adjusting three ways of the profile layout, namely, the original parallel (0 degrees angle) layout, the 22.5 degrees angle layout, and the 45 degrees angle layout. The results from FEM show that the heat accumulation occurs in the axis zone of the die in the 0 degree die layout, which will decrease when the layout is adjusted in increasing angles. The extrusion experiment shows a good result for die layout of 45-degree angle which can reduce the defect from 50 percent to 4 percent, resulting in high level of reducing waste product in the production process.
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