Research On Stamping Forming Numerical Simulation Of Ultr-high Strength Steel DP980 B-Pillar Internal Reinforcement Plate

The growing popularity of cars has revolutionized people's travels,but it has brought about the huge consumption of energy and the serious pollution of the environment.Nowadays,lightweight car can alleviate the problem of resource consumption and serious environmental pollution.However,ultr-high strength steel can not only guarantee the strength of automobile parts,but also realize the requirement of light weight.But the yield strength and tensile strength of ultra-high strength steel are very high,resulting in stamping difficult.Stamping parts are prone to crack,wrinkle,springback and other forming defects.How to control these forming defects has become a hot spot of the current research and production.Using finite element simulation software can predict the process of sheet metal forming and final product defects,which improves the quality of the product.It can not only significantly shorten the die development and design cycle,but also can reduce the production cost of enterprises,making products continue to "innovation" to enhance the market competitiveness of enterprises.In this paper,the B-pillar internal reinforcement plate is used as the research object,whose the material is DP980 ultra-high strength steel.And the finite element simulation software Auto Form is used to simulate the muti-step process of stamping,and finally this method used in actual production.The contents and the conclusions of this paper are as follows:1.In view of the structural characteristics of the B-pillar internal reinforcement plate and the performance of the DP980 ultra-high strength steel material,the possible forming defects are predicted and a detailed stamping process is developed: drawing?trimming?cam-forming?cam-piercing.2.The muti-step process of B-pillar internal reinforcement plate is analyzed using simulation in detail.The forming defects are analyzed and the relevant measures to eliminate them are put forward.3.The influence of four process parameters on the simulation results of the sheet forming is studied by using the evaluation index of the drawing results.The orthogonal test is used to design the orthogonal table.The optimum parameters were determined as follows: the blank holder force is 500 KN,the mold gap is 2.4mm,the die radius is 15 mm,the friction coefficient is 0.11;The best combination of the process parameters of the various processes are analysed.In view of the final springback simulation,the springback compensation is carried out on the origin mold surface,and the maximum springback of the product is 1.529 mm,less than 2mm,which is used in the actual mold production and stamping parts production.