TAILIEUCHUNG - Robot Mechanisms and Mechanical Devices Illustrated P2

Introduction laser fusing of ceramic powders to fabricate parts as an alternative to the use of metal powders. A system that would regulate and mix metal powder to modify the properties of the prototype is also being investigated. Optomec Design Company, Albuquerque, New Mexico, has announced that direct fusing of metal powder by laser in its LENS process is being performed commercially. Protypes made by this method have proven to be durable and they have shown close dimensional tolerances. Research and Development in RP Many different RP techniques are still in the experimental stage and have not yet achieved commercial status. At the. | xxx Introduction laser fusing of ceramic powders to fabricate parts as an alternative to the use of metal powders. A system that would regulate and mix metal powder to modify the properties of the prototype is also being investigated. Optomec Design Company Albuquerque New Mexico has announced that direct fusing of metal powder by laser in its LENS process is being performed commercially. Protypes made by this method have proven to be durable and they have shown close dimensional tolerances. Research and Development in RP Many different RP techniques are still in the experimental stage and have not yet achieved commercial status. At the same time practical commercial processes have been improved. Information about this research has been announced by the laboratories doing the work and some of the research is described in patents. This discussion is limited to two techniques SDM and Mold SDM that have shown commercial promise. Shape Deposition Manufacturing SDM The Shape Deposition Manufacturing SDM process developed at the SDM Laboratory of Carnegie Mellon University Pittsburgh Pennsylvania produces functional metal prototypes directly from CAD data. This process diagrammed in Figure 10 forms successive layers of metal on a platform without masking and is also called solid free- form SFF fabrication. It uses hard metals to form more rugged prototypes that are then accurately machined under computer control during the process. The first steps in manufacturing a part by SDM are to reorganize or destructure the CAD data into slices or layers of optimum thickness that will maintain the correct 3D contours of the outer surfaces of the part and then decide on the sequence for depositing the primary and supporting materials to build the object. The primary metal for the first layer is deposited by a process called microcasting at the deposition station Figure 10 a . The work is then moved to a machining station b where a computer-controlled milling machine or grinder .

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