Study On Inclusions And Its Removing In 3104 Aluminum Alloy

3104 aluminum alloy is considered as an ideal packaging container of beer or carbonated beverage and widely used. Increase of gas pressure in the container results in cracking or exploding of the cans after sealed, if there are some crack defects caused by inclusions. So the removal process of inclusions is an important part of the productive process of 3104 aluminum alloy.The process of the melt holding and the filtration with a filter after smelting of 3104 aluminum alloy are investigated in this thesis. The mathematic models are built to describe the movement and the removal of inclusions in the two processes, and then carried out by the commercial software Fluent. The motion and the removal of inclusions with different variety, shape and size in the melt holding and the filtration process with a filter are investigated in detail by this model, and verified by the experiment rresults. The conclusions are as follows:(1) The motion trajectory of inclusions has a certain change under the effect of slight natural convection during the process of melt standing. The inclusion particles are floated by the slight convection, and it makes the removal effect better. The change in quantity of inclusions is obvious in the early standing process, and then is close to a smooth gradually.(2) The removal results of melt standing show that the inclusions are easy to float with decreasing of their diameter and increasing of their size and shape factor, when the density of inclusions is smaller than the melt. The inclusions are easy to float with increasing of their diameter and decreasing of their size and shape factor, when the density of inclusions is larger than the melt.(3) During the process of filtration. The removal rate increases first and then decrease with increasing of the filtration rate. The removal efficiency is the best when the speed of melt passing the filter is 950mm/min and the removal rate reaches 94%. Meanwhile, the larger the amount of holes on the filter is, the smaller the holes are, and the more precision the filter is, the better the removal efficiency shows. The removal rate of 50ppi model reaches 97% in this thesis.(4) During the process of filtration with a filter, the removal results show better when the density and the shape factor is smaller under the condition with a certain filtration rate. Diameter has little effect on the removal results (the diameter of holes is well larger than the inclusion particle). The inclusion particles aggregate mostly above the filter and adsorbed by the filter, so diameter has little effect.(5) The experimental results show that the inclusion in 3104 aluminum alloy is mainly TiB2, MgO, spinel, oxide film, cuboids. Most of cuboids and oxides with a big shape factor are removed during the process of melt holding. The results of the process of filtration with a filter show that the inclusion particles are mostly removed and aggregate above the filter. Most of oxide films and oxides with a big shape can be removed by filter. The numerical simulation results are agreed with the experimental results.