Compared with hand-made mould,using three dimensional CAD/CAM software,not only the manufacturing period of mould can be shortened but also the foamed pattern can fully meet the design ideal,in which the irregular curve face and fillet as well as uniform walled-thickness can be assured so that the pattern deformation can be restricted in subsequently pouring process to improve the mechanical properties of the components.The design and manufacturing of foamed pattern for 18686-C type gear box in lost foam casting were completed.It was verified that the pattern can fully meet the design requirement,realizing the batches of production.
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