Study On The Shape Evolution And Heat Transfer Of The Rodbillet During Spray Forming Process

Spray forming is a new-style technique for metal forming developing from 1960's. It has overcome the shortcomings of coarse grains and serious segregation in traditional casting process, and get rid of various working procedures and serious oxidation in powder metallurgy process, but also has the advantage of powder metallurgy technology, is a highly competitive rapid solidification process. But because of there are a great many of parameters in spray forming process, study this process through experiment directly is workload, high cost and long cycle. Using computer numerical simulation technology can solve this problem effectively.The shape evolution and heat transfer model of rod-billet was established in this paper, And use the shape evolution model modeling the shape evolution of rod-billet in different parameters according to the deposition equipment of Baosteel , the following conclusions can be drawn: Use direct injection and single nozzle in spray forming, when the injection angle of nozzle is 0°,can't form rod-billet, when the injection angle is 20°and 35°can form rod-billet; use direct injection and double nozzle in spray forming, can form rod-billet all, and the combination of nozzles of 20°and 35°is most instability. Use incline injection and single or double nozzle can form rod-billet all, but when the distance from the nozzle to the substrate is small, metal received rate will decreased significantly.The deposition billet heat transfer process in two different parameters are simulated using heat transfer model established,the following conclusions can be drawn: The temperature of the rod-billet formed by stable growth condition is even everywhere except at the bottom area, and the trend of temperature change to time change is similar, thus the billet has good performance; the temperature of the billet formed by unstable growth condition is difference except center area, and the cooling rate of top area and bottom area is greater than center area, thus the billet has poor performance.