3. CAE model and process parameters analysis
3.1. CAE model
The CAE analysis model is as shown in Fig. 3, the die is set at the top, punch is set at the bottom, and the blank
is heated to about 930 0
C for 180 seconds and then transferred to the stamping die. The forming process is divided
as blank placing, stamping, and quenching. To begin with, the die moves down to the blank. At the end of forming,
punch is closed to the die, finishing a pressure-retaining quenching. Since the front door beam is complex featured
with twin-U shape. In order to obtain better forming results in the twin-U area, a movable pad (die) was proposed
1788 Ming-Fu Li et al. / Procedia Engineering 81 ( 2014 ) 1786 – 1791
and designed to form the central area of twin-U shape as shown in Fig .4. The mould assembly includes water
cooling channels in punch and die. The die and punch were made by SCM440 steel. The press used for hot
stamping process is a hydraulic machine with maximum pressing force of 8,000 KN.