Research Of New Spray Forming Atomizer Design

Atomizing spray forming technology not only overcomes the shortcomings of coarse grain and serious segregation in the traditional casting process but also abandons some shortcoming in powder metallurgy process, such as complicated processes and serious oxidation, so it is very competitive in rapid solidification process. During spray forming, metal droplets atomizing is the key to the quality of micro-technology, so atomizer becomes the core of the spray forming process. In order to Solve the drum packets phenomenon of freestyle atomizer or anti-spray phenomenon of coupled atomizer, this article designed a new type unrestricted atomizer, determined the structure of new freestyle atomizer based on structure of double-decked unrestricted atomizer, combined with the CFD software FLUENT got the influence rule of technological parameter to atomization process and did some experimental verification..By analyzed the factors of atomizer and catheter and the impact of these factors on atomization, the final structure of the atomizer was designed as circle-shaped gap, the gap size of main atomizer and the auxiliary atomizer is 0.3mm and 0.5mm, the atomization angle of main atomizer and the auxiliary is 35°and 0°. The catheter extend distance is 4mm,θis 180°, inner diameter is 4mm.Did some simulation to the atomization region under different pressure, and did some analysis of pressure and velocity distribution, the results show, when the auxiliary atomizer's pressure become greater can get big negative pressure, negative pressure zone is mainly affected by the impact of auxiliary atomizer and pressure of the atomization region is mainly affected by the main pressure atomizer. When main atomizer's pressure is 1.0MPa and the auxiliary atomizer's pressure is 0.5MPa, can get big negative pressure and not appear drum packets phenomenon, when main atomizer's pressure is higher than 1.5MPa, drum packets phenomenon may appear. On the basis of numerical simulation results, this article did some experimental analysis of several different kinds of pressure. The experimental results are consist with the simulate conclusions, when main atomizer's pressure is 1.0MPa and the auxiliary atomizer's pressure is 0.5MPa, can get a good atomization phenomenon, when the main atomizer's pressure is too low, atomization phenomenon is not good, when the main atomizer's pressure is higher than 1.5MPa drum packets phenomenon may appear. In addition, experiment was did when only the main atomizer working, result shows, at the same structure, the main atomizer's pressure is no more than 0.7MPa...