15 Simulation of Multi-step Tube Hot Gas Forming Process …
187
Table 15.2 Gas system
parameters
Maximum pressure
Maximum volume
Minimum open
distance
70 MPa
8 L
450 mm
After the bugling, an in-die quenching is conducted in the same spot for 20 s.
In this step, the high-pressure gas supplement keeps. The cooling water system is
design as shown in Fig. 15.5. The diameter of the water ducts is 10 mm and the
displacement from the ducts to the surface is 8 mm. The water velocity of the inlet
is about 3 m/s, which makes it 25 L/s. Thus, A 120 kW screw water-cooled chiller
is employed.
Then the die opens, and the formed part is translated to the other spot. In this spot,
the tube with a residual temperature is cooling to the room temperature in a second
process routine to further prevent oxidation of the tube. The entire process time line
is shown in Fig. 15.6.
Fig. 15.5 Cooling water system
Fig. 15.6 Sequence of the entire process
187
Table 15.2 Gas system
parameters
Maximum pressure
Maximum volume
Minimum open
distance
70 MPa
8 L
450 mm
After the bugling, an in-die quenching is conducted in the same spot for 20 s.
In this step, the high-pressure gas supplement keeps. The cooling water system is
design as shown in Fig. 15.5. The diameter of the water ducts is 10 mm and the
displacement from the ducts to the surface is 8 mm. The water velocity of the inlet
is about 3 m/s, which makes it 25 L/s. Thus, A 120 kW screw water-cooled chiller
is employed.
Then the die opens, and the formed part is translated to the other spot. In this spot,
the tube with a residual temperature is cooling to the room temperature in a second
process routine to further prevent oxidation of the tube. The entire process time line
is shown in Fig. 15.6.
Fig. 15.5 Cooling water system
Fig. 15.6 Sequence of the entire process