Numerical Simulation Analysis For Stamp-forming Process Of Ultrathin Sheet Metal

Stamp-forming process for sheet is one of the important methods in the forming, and it occupies a very important position in the manufacturing industry. It obtains required shape of workpiece by using the made mould or other equipment. This process method possesses many advantages, which are high material utilization and low processing cost and high performance and high efficiency and so on. However,this process method takes on some disadvantage gradually along with high refresh speed and short manufacturing cycle and low process cost of products resulted from technology developing at top speed in CAD/CAM/CAE, such as spending too much time on de-bugging and repairing a die during the whole cycle of mould. In the paper, numerical simulation analysis for stamp-forming process is carried on by the finite element simulation based on research for traditional process of sheet. The strain and variation in thickness of sheet are understood in the round after processing, and many process drawbacks of sheet will be forecasted after stamp-forming process, which includes wrinkles and tension fracture and so forth. Influence of process parameters and mechanic parameters on processed fruit could be simulated and analyzed by the computer. Optimalizing forming parameters are also obtained,which provides bases and methods for making the stamp-forming process and numerical simulation analysis of ultrathin sheet, and makes the cycle of mould designing and manufacturing shortened, and makes the quality of mould improved.Chapter one brought out the significance of studying this project and key technology applied and some existing problem questions on the base of analyzing the background related to stamp-forming and numerical simulation technology, and then raised the main research contents for the paper.Chapter two discussed the basic theories of numerical simulation computation. On that basis, dynamic explicit algorithm and static implicit algorithm are inferred, and the advantages and disadvantages and range of application of the two algorithms are brought out. Grid cells and material models are made intensive study, and the methods of selection are brought out, which laids the good foundation of improving the research.Chapter three measured the mechanic parameters of material with existing availability, and handled these obtained data. From this study, values of these parameters could be got. The meaning of these parameters and range of application are given a discussion, which laids the foundation of the coming simulation analysis.Chapter four designed one drawing die which ultrathin sheet drawing applied, and researched the key parameters, such as blank holder force. Assembling diagram of the mould is got by these researches. During these computations, blank size and drawing force and blank holder force are the targets which results of numerical simulation compare with.In chapter five, numerical simulation for drawing deep of part is carried on, and key steps which Dynaform applies in are researched. And complete solution procedure is also demonstrated. Some factors which can influence on the result of numerical simulation for stamp-forming are also researched. From these results of research, some conclusions can be obtained, which supplies some refers for numerical simulation for stamp-forming process of other ultrathin sheet.Chapter six summarized the researches of this issue, and indicated certain innovations and research findings, and prospected numbers of matters and directions need to be studied.