Investigation of thin boron steel sheet formability in hot deep-drawing processes according to process parameters

摘要

This study has evaluated the formability of thin boron alloy sheets, 0.6 mm thick, which can be bent through heating and torn easily during hot press forming. The punch velocity was used as the parameter for the contact time, and the initial blank temperature and blank holding force parameters were controlled. The temperature of the dies and punch was fixed at 300℃ to improve the formability. Microstructural observations and the hardness were examined at different parts of the formed boron steel sheets after die quenching. After the forming process, relationships between the process parameters were found. The punch load and forming depth decreased with increasing punch velocity. On the other hand, the punch load increased with increasing blank holding force, but the forming depth decreased. An increase in the initial blank temperature resulted in an increase in forming depth, but a decrease in punch load.