ZHANG Hua-wei
,
LIU Li-zhong
,
HU Ping
,
LIU Xiang-hua
钢铁研究学报(英文版)
In order to grasp the springback rule of TRB (tailor rolled blank) parts after forming, the springback behavior of TRB was investigated by integrating such three means as theoretical research, numerical simulation and stamping experiments. Fundamental theories of springback were analyzed. The stamping and springback processes of annealed 1.2/2.0 mm TRB, 1.2 mm and 2.0 mm plates for U-channel were simulated, and the simulation results were compared with the experiments. The results indicate that the springback of TRB falls in between those of the 1.2 mm and 2.0 mm plates. It is desirable for the TRB U-channel to have die clearance of 1.1 times maximum blank thickness and friction coefficient of about 0.12, and longer thickness transition zone is preferable. The simulation data demonstrate reasonably good agreement with the experiments.
关键词:
tailor rolled blank
,
U-channel
,
springback
,
annealing
CHANG Ying
,
MENG Zhaohuan
,
YING Liang
,
LI Xiaodong
,
MA Ning
,
HU Ping
钢铁研究学报(英文版)
Based on the combination of materials science and mechanical engineering, hot press forming process of the vehicle high strength steels was analyzed. The hot forming process included: heating alloys rapidly to austenite microstructures, stamping and cooling timely, maintaining pressure and quenching. The results showed that most of austenite microstructure was changed into uniform martensite by the hot press forming while the samples were heated at 900 ℃ and quenched. The optimal tensile strength and yield strength were up to 1530 MPa and 1000 MPa, respectively, and the shape deformation reached about 23%. And springback defect did not happen in the samples.
关键词:
high strength steel
,
lightweight
,
hot forming
,
martensite
