Table 5 Hot extrusion parameters for the coupled hot extrusion FE model
Parameter | Content |
|---|---|
Pipe size (mm) | φ630 × φ500 × 9000 |
Initial billet temperature (°C) | 1150, 1200, 1250 |
Initial die temperature (°C) | 300 |
Initial grain size (μm) | 123 |
Extrusion ratio | 5, 7, 9 |
Extrusion speed (mm/s) | 30, 40, 50 |
Die taper angle (°) | 42 |
Coulomb friction coefficient | 0.04 |
Thermal emissivity of blank | 0.7 |
Environment temperature (°C) | 20 |
Heat convection coefficient between billet and extrusion tools (N/mm/s/°C) | 11 |
Heat convection coefficient between billet and air (N/mm/s/°C) | 0.02 |