Numerical Simulation Research On Wide Casting Nozzle Of The Twin-roll Magnesium Alloy Slab

The casting nozzle form have a great influence on the improvement of strandquality and process stability, and the casting nozzle form is the important guarantee toget high quality magnesium alloy thin-slab. In the practical production, the more wideslab, it need the more wide casting nozzle, so it is more difficult to make casting processsmoothly and get uniform fluid velocity distribution.. At present, the width ofmagnesium alloy thin slab strands produced at home and abroad is almost below1000mm, and there are few news about AZ31magnesium alloy thin slab strands withthe width more than1000mm reported in native. Therefore, the research on the twin-rollstrip casting nozzle structural as wide as1500mm of AZ31magnesium alloy is of greatsignificance..Base on the numberical simulation and physical simulation, it research types of thecasting nozzle(Hunter type,3C type,2split type) and structural parameters(length,lateral shape, wake length of the casting nozzle and the number, location, shapes, size ofthe divergent fluid block) influence of the fluid velocity distribution uniformity, drawthe following conclusion:â‘ Through numerical simulation magnesium alloy melt fluid field in the Huntertype casting nozzle, analysing uniformity of the flow velocity distribution outside thecasting nozzle, the results show that the flow velocity distribution uniformity of theHunter type are not suitable for production magnesium alloy wide slab.â‘¡Analysising some parameters (fluid flow, length of the casting nozzle, wallshape of the casting nozzle, wake length, divergent fluid block) influent uniformity ofthe flow velocity distribution outside the3C type casting nozzle, the results show that:magnesium alloy melt with the inctease of flow speed increase, the more greater flow,the more evenly of the flow velocity distribution export the casting nozzle; the morelength casting nozzle, the more evenly of the flow velocity distribution; increasing thewake length can obtain more uniform flow velocity distribution; using small streamlineand more divergent fluid blocks can improve the uniformity of flow velocitydistribution export the casting nozzle; through the results presented a new castingnozzle.â‘¢According to simulate and analysis the fluid field of the magnesium alloy meltin the2split type casting nozzle, the results show that uniformity of the flow velocity distribution are suitable for production magnesium alloy wide slab.â‘£As in the numerical simulation of the magnesium alloy melt are given moreassumptions, so in order to verify the correctness of the numerical simulation results.Combined with water model experiment, analysing the structural parameters(thenumber, location, shape of the divergent fluid block) influent the fluid velocitydistribution uniformity. The results show that take seven streamline divergent fluidblocks can improve the uniformity of flow velocity distribution export the castingnozzle, water model experimental results are the with the numerical simulation results.This paper puts3C new structure3type of the casting nozzle and2split typestructure4of the casting nozzle, it can make the fluid maximum and minimum speeddifference4.69%and4.79%, all less than5%, the uniformity fit practical productionneeds which in magnesium alloy with wide(1500mm) twin-roll continuous casting.