Numerical analysis of deforming force for the backward extrusion process based on slip-line field theory

作者：秦小琼; 刘德学

来源：山东大学学报(工学版), 2011, 41(6).

• extrusion force
• slip-line field
• numerical analysis

The calculation of deforming force depends on experience formula in extrusion process design.It may leads to large calculation error and can not be used in optimization design.Based on the classical plasticity theory,a more accurate and convenient calculation model of extrusion force was studied by mathematical methods.Based on slip line field theory,the backward extrusion process with a cup-shaped mold was studied.Series slip-line field features of different compression ratio were analyzed and superposed.The stress field and deforming force were calculated.The analytical relationship between slip-line field parameters and mold geometrical parameters were analyzed.In this way,the numerical analysis model of the deformation physical parameters of geometric parameters was established.The analytical solution obtained by the numerical analysis model has more obvious physical significance than that by the slip-line field method.If deformation geometric parameters are known,the analysis model could be conveniently used to solve extrusion force.Finally,the extrusion force was also measured with experiments and combined with experience formula for verification.The results showed that the numerical analysis model calculation results were more accurate,which could be used as an objective function to realize processing optimization design.

• 出版日期2011
• 单位兰州理工大学