유동방향과 밀도이방성 분석을 위한 세라믹 분말사출성형 해석 = Simulation of Ceramic Powder Injection Molding Process to Clarify the Change of Sintering Shrinkage Depending on Flow Direction

다국어 초록 (Multilingual Abstract)

This study has focused on manufacturing technique of powder injection molding of watch case made from zirconia powder. A series of computer simulation process was applied to prediction of the flow pattern in the inside of the mould to clarifying the change of sintering shrinkage depended on flow direction. The material properties of melted feedstock inclusive of the PVT graph and thermal viscosity flowage properties were measured for obtaining the input data in computer simulation. Also, molding experiment was conducted and the results of experiment showed that good agreement with simulation results for flow pattern and weld line location. On the other hand, gravity and inertia effect have an influence on velocity of melt front because of high density of ceramic powder particles in powder injection molding against the polymer injection molding process. In the experiment, the position of melt front was compared with upper gate and lower gate position. The gravity and inertia effect could be confirmed in the experimental results.

참고문헌 (Reference)

1 김현필, "효과적인 웰드라인 제어를 위한 사출성형 유동해석" 한국생산제조시스템학회 10 (10): 64-72, 2001

2 권태헌, "분말사출성형 충전공정에 대한 수치모사 모델" 한국분말야금학회 9 (9): 245-250, 2002

3 T. K. Ha, "Powder Injection Molding Technology" 12 (12): 521-528, 2003

4 채수호, "Porosity Control of Porous Zirconia Ceramics" 한국세라믹학회 45 (45): 65-68, 2008