| Modern weapons are increasingly moving towards the development of security,diversification,and rapid development,as a power source,the traditional processing method of energetic materials can not meet the modern requirements.Rapid prototyping technology meets the requirements of high efficiency,high precision,low cost and high safety.Among them,the most popular rapid prototyping technology is 3D printing technology.This structure optimizes the structure of the 3D printing and discharging device for energetic materials,and focuses on the study of the process parameters of the 3D printing system's discharging device.The purpose of this article is to improve the safety of the energetic material forming process and provide theoretical basis for improving the strength of the molded part.Finally,the pressure of the dynamite in the flow channel is experimentally verified.The main research contents of the article are as follows:(1)The design and optimization of the discharge device structure in the plunger-type extrusion method and the experimental research on the uniformity and extrusion rate of the extruded material for the energetic material substitute.(2)A mathematical model of the material extrusion process of 3D printed runners of energetic materials was established,and the effects of different slip coefficients on the pressure,temperature,and shear rate fields of energetic materials were simulated using POLYFLOW software.The results show that the wall slip is more conducive to reducing the pressure,temperature and shear rate in the flow path of the energetic material,and improves the molding safety.(3)Based on the orthogonal test design method,the feed flow rate,temperature,slip coefficient and nozzle diameter were used to experimentally study the uniformity of pressure,temperature change and extrusion speed in the flow path of the drug,and the range analysis method and variance analysis method were used to analyze the test results respectively,and the main and secondary relationships of each factor's influence on a single index were obtained,and the optimal combination scheme and the most dangerous combination scheme of the test results were obtained.(4)This article presents a real-time continuous pressure measurement and closed-loop control with a flat film pressure sensor.The sensor is designed to be installed on the side wall of the barrel to study the pressure of the medicine in the barrel during the 3D printing of energetic materials.Finally,the pressure in the flow channel is detected in real time and controlled in real time through closed-loop control to make it run within the safe pressure range.(5)According to the optimal combination of process parameters,the prototyping of strip,the star-shaped,through-hole,and cylindrical shapes are targeted for molding according to the optimized combination of process parameters.As a result,samples of energetic materials were successfully printed. |
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