Formulation of rod-forming models and their application in spray forming
- Formulation of rod-forming models and their application in spray forming
- 석현광; 이희춘; 오규환; 이재철; 이호인; 나형용
- rod-forming model; spray forming; transient growth; steady growth; time-dependent model; time-independent model
- Issue Date
- Metallurgical and materials transactions. A, Physical metallurgy and materials science
- VOL 31, NO 5, 1479-1488
- In rod spray forming, the preform changes its shape continually from that of a disc to a rod (transient-state rod growth) and then maintains its top surface profile once it has settled down (steady-state rod growth). The rod growth mechanism during spray forming was analyzed using rod-forming models. At a sufficiently high substrate rotation velocity, the calculated results based on the three-dimensional time-dependent model (3-D TDM) and the two-dimensional time-dependent model (2-D TDM) were observed to be identical. The calculated results of the rod’s top shape, obtained by the TDMs, were almost identical to those obtained by the two-dimensional time-independent model (2-D TIM), which means that there exists steady-state rod growth. The effects of spray-forming parameters, such as initial eccentric distance, substrate withdrawal velocity, and spray angle, on the shape-evolution behavior were analyzed in terms of the vertex growth velocity ( G v o ¯ ¯ ¯ ¯ ). The optimum spray-forming condition to minimize transient-state rod growth was also presented. Experimental verification was made to confirm the proposed forming models.
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