Abstract: In order to obtain the structural parameters of specific multi-perforated gun propellant mould, the fluid-solid coupling module of Workbench is used to simulate the extrusion process of gun propellant slurry in the mold cavity and the deformation process of needle holder. The influences of shrinkage angle and length of molding on the extrusion molding pressure and the deformation of needle holder system are analyzed by the single factor method. The result shows that the compactness of extruded propellant and the deformation of needle holder system increase with the increase in length of forming segment and pressure. With an increase in contraction angle, the pressure and compactness of extruded propellant increase, but the deformation of needle holder system decreases gradually. At more than 55°, the pressure amplitude increases and the amplitude of the system deformation decreases. The pressure difference between the contracting segment and the forming segment is gradually reducedfrom the inlet to the outlet, and the final pressure distribution is uniform. Key

Key words: ordnancescienceandtechnology, propellant, Workbenchsoftware, multi-perforatedgunpropellantmould, extrusion, section