Hot forming is the advanced technology that integrates traditional heat treatment and cold stamping. The ultra high strength component with the tensile strength 1600 MPa can be manufactured by hot forming. The tensile tests of the hot forming material and part are investigated. The yield limitation of the part by hot forming is more than 1000MPa, and the strength limitation is more than 16000MPa. Three-point bending experiments of the reinforced beam by cold stamping and hot forming are carried out. The experimental results show the parts by hot forming have excellent loading capability and impact resistance. The optimization design method for hot forming part is investigated and presented.
The hot stamping process and process parameters are investigated for a model of a B-pillar outer plate by numerical simulation. The feasibility of hot stamping forming process and its parameters are analyzed. The effectiveness of numerical simulation and the accuracy of hot stamping forming process and its parameters for B-pillar outer plate are proved by the hot stamping experiment and tensile tests. Three models are designed to analyze the effect of B-pillar in the vehicle side impact. It shows that hot stamping technology has the advantages in the field of lightweight and improving impact resistance. Through the research of the historical process of hot forming part, the residual strain characteristics of hot stamping parts is analyzed, the produce and mechanism of residual strain is explained, and the application method based on the forming history of hot stamping technology is provided.
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