Optimization of automotive hinge rolling process based on damage factors
To identify the more suitable toughness fracture criterion for the rolling forming process of complex cross-section steels,a comprehensive numerical model for hinge steel rolling that incorporates various toughness fracture criteria was estab-lished.By analyzing the relationship between Vickers hardness values of rolled sections and the damage factors calculated through simulation,the Brozzo toughness fracture criterion was determined to be the most effective for predicting material damage evolution in the rolling process of complex cross-section hinge steels.By utilizing the damage factors computed based on the Brozzo criterion,the influence of different combinations of rolling process parameters on the maximum damage factor of the rolled product was investigated.Through orthogonal experiments and multiple regression analysis,it was established that initial rolling temperature,die angle,and roll diameter significantly affect the maximum damage factor,while rolling speed does not have a significant impact.The optimized set of process parameters was identified as follows:initial rolling tempera-ture of 1 250℃,roll diameter ratio of 1.15,die angle of 1.61°,and roll speed of 148.9 r/min,resulting in a maximum damage factor of 7.92,which represents a 20%reduction compared with the pre-optimization value.These findings demonstrate that ap-propriate combinations of rolling process parameters can significantly reduce the damage factor of rolled products,thereby en-hancing product quality.
hinge steeltoughness fracture criterionrolling formingprocess parameter optimizationorthogonal testVick-ers hardness
万方数据
维普
