Abstract:Polyflow was used to simulate the wire coating gas-assisted extrusion process. First, the influence of the drag speed of wire and the inlet flow rate of melt in the wire coating process on die swell was studied from the perspectives of traditional extrusion and gas-assisted extrusion. Then, with different inlet flow rates on the gas-assisted extrusion and the conventional extrusion in the wire coating, the pressure field, velocity field and shear rate field were compared and analyze. The results show that the die swelling of wire cladding is inversely proportional to the dray speed of wire, proportional to the inlet flow rate, and can't be eliminated by gas-assisted extrusion. Compared with conventional extrusion, the energy consumption and shear force of the die on melt can be reduced and the coating quality can be improved by gas-assisted extrusion.