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Sheet metal forming process is that in which force is applied to a piece of sheet metal to modify its geometry rather than remove any material.The applied force stresses the metal beyond its yield strength, causing the material to plastically deform,but not to fail.By doing so,the sheet can be bent or stretched into a variety of complex shapes. Compared with other processing methods, it has the advantages of simple technique, easy control,high productivity and low cost. So it is widely used in many kinds of industry fields.But, sheet metal forming is a complex process,which is affected by material properties,friction condition, technological conditions,structure of dies,so it is liable to own some defects,such as wrinkle,fracture and springback, etc.Facing the drastic competition in the market economy, the deficiencies of "trial-and-error" are becoming more and more evident.Numerical simulation of sheet metal forming has been paid attention by more and more people.It can optimize the technological parameters and forecasts the defects.In some situations, there may be a physical part/product without any technical details,such as drawings, bills-of-material,or without engineering data. The process of duplicating an existing part, subassembly, or product, without drawings, documentation, or a computer model is known as Reverse Engineering (RE).Combined with Reverse engineering, Numerical simulation technology of sheet metal forming, springback, and springback compensation technologies,this thesis researched the forming process of an approximate V-shaped baffle of air conditioning. Based on the summarizing and presentation of basic theory and present research situation, reconstruction of CAD model,forming and springback simulation of the part ware conducted.At last, the mold surface of the part was created using springback compensation technology.Firstly, the point cloud data was obtained by ROMER INFINITE2.0Arm Coordinate Measuring System of Advanced Design Technology Lab of GDUT, followed by its pretreatment, segment and reconstruction in Studio.Combined with UG the CAD model of the baffle was made.After the preprocessing of the CAD model,some important process parameters were optimized by orthogonal test, meanwhile,the defects of wrinkle,fracture were reduced or avoided and a better forming process was achieved. The springback was calculated by Numerical simulation in Dynaform, and was compensated using ThinkDesign Compensator. The mold surface of the baffle can be directly used for the design and production of the mold surface,so the time cost of tryout can be greatly reduced.The research method and procedure of this thesis provide a practical technological process which can improve the efficiency and competitiveness of enterprises.
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