Transactions of Materials and Heat Treatment

Title：Hot stamping and blank shape design for vehicle bumper

Authors： GUI Zhong-xiang ZHANG Yi-sheng LI Hong-qing MA Ming-tu GE Rui

Unit： Huazhong University of Science and Technology China Automotive Engineering Research Institute

KeyWords： hot stamping die design blank shape optimization digital test line for hot stamping die temperature

ClassificationCode：TH16

year,vol(issue):pagenumber：2013,38(3):19-23

Abstract：

The full-scaled hot stamping dies were designed for an automotive bumper, with the well-designed blank shape incorporated into clamping and positioning, experiments were conducted to verify the reliability of the die and sheet metal blank design, as well as the tests for microstructure and mechanical properties of the hot-stamped part. The results show that position stability of the blank is greatly improved during the robotic transport process after shape optimization. Metallographic analysis demonstrates that a fully martensitic microstructure is obtained in the hot-formed bumper, the tensile strength is about 1550MPa, Rockwell hardness is 47.5 HRC, and the hardness of each test point is very uniform, while the elongation is up to 6%. It is beneficial to the forming force reduction and stabilization of the quenching temperature by an increase in die temperature on condition that the critical cooling rate of sheet blank is guaranteed.

Funds：

国家自然科学基金资助项目(51275185)

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