Dynamics simulation and product quality consistency optimization of energetic material extrusion process

This study addresses the issue of quality consistency in the extrusion process of energetic materials using multi-channel dies. To improve the extrusion efficiency of single-base energetic materials, a multi-channel die approach is utilized to yield more products in one extrusion. However, this method may compromise quality consistency during the process. Consequently, the finite element method (FEM) was employed for dynamics simulation of the extrusion process in the multi-channel die and further analysed the impact of critical parameters, such as extrusion speed and channel position, on product quality consistency. A strong linear relationship between flow parameters and d_c , the average distance from each channel to the center of the die outlet plane, was reveal from simulation results. An optimization method based on channel distribution was proposed, and the product quality consistency ratio was calculated by averaging the shape consistency ratio, surface quality consistency ratio, and density consistency ratio. Simulation results indicate that this method effectively improves product quality consistency without significantly compromising extrusion efficiency. However, while increasing piston speed can also enhance product quality consistency, it will raise the extrusion pressure, thus increasing the risk of energetic material burning. Overall, this research provides new theoretical underpinnings and practical methods for optimizing the extrusion process of energetic materials. The basic theory, formula, algorithm, and simulation will be presented to validate the correctness and feasibility of the proposed method.