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RISS 인기검색어
- 검색키워드
- 저자 : 권홍규 (검색결과 1 건)
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Experimentation and analysis of contour crafting (CC) process using uncured ceramic materials
권홍규 University of Southern California 2002 해외박사
Contour Crafting (CC) is a new patented additive fabrication technology developed in the University of Southern California, which uses computer control to exploit the superior surface-forming capability of troweling to create smooth and accurate planar and free-form surfaces. To produce exceptionally smooth and accurate planar and free-form surfaces, the process utilizes trowels that function as solid planar surfaces. Using fewer different troweling tools than in traditional plaster handwork and sculpting, the process is the ability to rapidly produce parts with superior surface finishes, and enables the creation of various surface shapes. Components as large as boats with complex geometries and smooth surfaces can be made accurately at relatively high speeds with a variety of materials. This dissertation presents the details of the construction and operation of the fabrication machine as well as procedures and results of experimental investigations of CC in fabrication of ceramic parts. Various geometrical shapes were investigated with carefully chosen uncured ceramic materials to validate the feasibility of CC in rapid prototyping of mechanical parts as well as the potential of the process in automated construction industry. The potential of CC became evident from the prudent investigations and experiments with various materials and geometries. Using ceramic materials (e.g. clay) as the fabrication material, the experimentation and modeling efforts were conducted to study the material flow patterns in the extrusion and deposition stages of the CC process. Using the FEA simulations, certain basic understandings of the effect of extrusion orifice geometry on the performance of CC were derived. A square orifice was found to be aptly suited, both in terms of delivering excellent fusion between layers as well as creating the desired external surface profile. The experimental observations support these results. To understand the effect of the flow pattern with respect to the different angles of the movable side trowel, the FEA simulations also were conducted on the performance of CC, and its results were compared with those of experimental observations. The research also resulted in the identifications of various procedures to create smooth part surfaces and various geometrical features.
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