| Summary: | 碩士 === 國立高雄第一科技大學 === 機械與自動化工程所 === 96 === In this study , the aims were to analyze the cold forging process of the forward extrusion method and to investigate the design of the mechanism applied in the AA6061 heat sink part forging die set. First the CAE software,“DEFORM-3D”, is not only used to analyze the stress and strain in the die as well as the situation of material flow during forging, but also analyze the forward extrusion process and the variables in extrusion die design are investigated. Then, the optimum variables according to the results of CAE simulation are used to design the actual die and are certified by the forging experiment using A6061 aluminum alloy as the billet.
The results show that after Process Annealing, when performing the Impact Extrusion by crank press forging machine with high aspect ratio of fin and hollow surface, the maximum load was 280 tons. The two steps deforming shows the full filling at shape part of the fin, and it is better than one step forming.Firstly forming preliminary shaping of the solid facture then hollow surface.The unsatisfied lowlines within the material and produced laps situation Not only the forging load but also the stress distribution and product appearance in the actual forging conform to those in the DEFORM simulation.
Therefore, it is feasible that using the DEFORM software simulates the forging process to find the optimum variables previously and then the design of the forging
die is proceeded according to the optimum variables. The design of the cold forging die set in this study is feasible as well.. The target vehicles, the heat sink ,
is forged successfully by the developed die set and the flow lines of the forgingsare reasonable. High aspect ratio of fin is 10.1 and measurement is within
tolerance.
|
|---|
