RESEARCH ON THE DEFORMATION OF DIE PINS DURING PROPELLANT’S EXTRUSION PROCESS

摘要

The phenomenon that the holes change the position caused by the pins moving exists in7-perforation propellant extruded by the solvent mothed. In this paper, the analysis of theforming process based on fluid-structure interaction method of mode pins moving wasstudied. The pressure distribution of extrusion process was analyzed and the effect oftemperature and velocity on the pins deformation was analyzed. Three dimension videomicroscopy was used to measure the web sizes of the propellant grains. The results show thatmaximum deformation of die pins present a quasi-linear increase trend with the speedincrease. When the entrance velocity is faster than 0.4mm·s-1, increase rate of deformation isreduced. Deformation presents linear decreasing trend with the propellant doughtemperature increase. The Nitroguanidine propellant is extruded by seven-perforation die indifferent experiment conditions. The experimental data and numerical simulation results fitwell.