Section Deposition / Engraving And Milling Of Rapid Prototyping Process Of Material Selection And Matching Process

The Decomposed Deposition and Sculpture (DDS) is a type of compound forming method, which is based on the combination of material deposition process and traditional CNC machining. It has the characteristics both of the high accuracy of traditional machining and the high flexibility of Rapid Prototyping technology. This process is carried out by decomposing a CAD solid model into a sequent segments according to the part's interfere and non-interfere area. The interfere area is processed directly, and the non-interfere area are processed by copying impression on the support material. The part material and the support material are different. Thus choosing a couple of appropriate materials of part and support is the premise for realizing the craft's process. Therefore, this thesis concentrates on looking for a couple of appropriate materials to satisfy the process demand. On this foundation, the Decomposed Deposition and Sculpture's technical method is optimized, and a lot of special parts' manufacture is realized.Firstly, the choice of the materials should satisfy the strict match relation, namely the peak value of part material solidified temperature can't exceed the melting point of the support material, and two kinds of materials should not dissolve mutually. After process completely, the part material can conveniently separate from the support material, and the support material can made the packing clips function to the part material. Through analysis of various of match materials, hot-solidified epoxy colophony and thermoplastic and machinable wax are chosen as part material and support material. According to the shortage of pure epoxy colophony in the hot-match and machinability, that the filled-material with aluminum power takes place the pure epoxy colophony as part material is advanced, and by the way of orthogonal experiments the performance of the different component filled-material, including time of solidify, peak value temperature, contractibility, electrical conductivity ability, stretch-strength, stress-deformation, machinability etc. are tested. Through rationalization analysis, the best project of material matching is selected.Secondly, the material shrinkage and distortion are deeply studied in the thesis, somemeasures of technology are put forward to. The thorough study on the generation of clearance in different material zones, inside sharp-angle and craft adjustment of each layer of the part has been done. Through a series of technological measures, the efficient material cementation is realized. In addition, the new viewpoints and opinions of cutter's choice and application are advanced.Finally, the regulations of decomposition of three dimensional solid and the software exploitation strategies are discussed. The incorporate equipment design project for the SSD is systematicly analyzed, and all the unites integration is realized. By making use of the self-determination exploitation incorporate equipment, some verification experiments were developed, and a part of typical parts' process examples were handed over.