Design of Hydraulic Bulging Die for Automobile Torsion Beam and Optimization of Forming Process Parameters

Figure 6

Schematic diagram of hydraulic control system: (1) oil source; (2) filter; (3) hydraulic pump; (4) motor; (5) overflow valve; (6) hand-directional valve; (7) hydraulic cylinder no. 2; (8) hydraulic cylinder no. 1; (9) rack no. 1; (10) displacement gear; (11) rack no. 2; (12) lever; (13) bidirectional shunt follow-up valve; (14) oil outlet no. 1; (15) oil outlet no. 2; (16) valve core; (17) oil inlet.