Zhichao SUN
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He YANG
材料科学技术（英文）
Tube inversion including free deformation under conical die is an advanced forming process for manufacturing complicated thin-walled parts with high strength/weight ratio, high efficiency, and good flexibility for size changing. However, the successful reality of forming process, the change of deforming mode and shape and size of part formed are mainly on the die angle. Based on the analysis of the forming process, the model of rigid-plastic FEM (finite element method) is established and a numerical simulation system is developed. The effect of die angle on the tube inversion forming process is investigated with the code developed. The results of the effect of half die angle on shape of free deformation zone and on deforming load are obtained. There is an optimal die angle (about 75 deg), which makes the forming load minimum.
关键词:
Tube inversion under conical die
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Mei ZHAN
,
He YANG
,
Yuli LIU
材料科学技术（英文）
With the development of computer technology and finite element method, the priority research area of plastic forming has focused on 3D FE simulation of forming processes for components with complicated geometrical shape. These processes have complex deforming mechanism, and different sections have different deforming characteristics. Therefore, for making a simple, convenient, and practical analysis of its deforming law, how to obtain deformation information of key sections from the results of 3D FE simulation has become one of problems urgently to be solved. So, a method of obtaining deformation information by tracing deformation from sections for 3D FE simulation has been proposed. From the deformation information got by this method, the deformation law of key locations and the whole deforming body can be obtained. This method can also help to compare the result from FE simulation with that from physical modeling. Key procedures of this method have been presented in detail, and it has been tested by applying to 3D FE simulation of precision forging of the blade with a damper platform. The result shows that the method is practicable and reliable, and it can also be applied to 3D FE simulation of plastic forming processes of other components.
关键词:
Plastic forming
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