Solid propellant additive manufacturing system and outer surface rotational molding method

Abstract

The invention discloses a 3D printer which is applicable to solid propellant additive manufacturing and provided with a rotating shaft and a method for manufacturing a solid propellant through the 3D printer provided with the rotating shaft. A molding platform of the 3D printer is changed into a barrel outer surface, and in other words, a propellant grain is molded on the barrel outer surface. The method comprises the steps that firstly, a propellant grain model is designed with modeling software; then, expansion change is conducted on the propellant grain model with the modeling software; a new three-dimensional spatial model obtained after expansion change is arranged in 3D printing upper computer software in a specific mode; slicing is conducted, a G code is generated, and finally materials are extruded through a printing spray head; and layer-upon-layer accumulation is conducted on the barrel outer surface, so that the solid propellant grain is obtained. According to the solid propellant obtained through the 3D printer provided with the rotating shaft through additive manufacturing, mechanical performance in the axial direction and mechanical performance the radial direction are remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, in particular to a 3D printer with a rotating shaft suitable for additive manufacturing of solid propellants and a method for additively manufacturing solid propellants using the 3D printer with a rotating shaft. Background technique [0002] The traditional thermoplastic solid propellant molding manufacturing mainly adopts the screw press molding process. With the increase of the molding size, the equipment system becomes larger and larger, the pressure required for molding is doubled, the energy consumption of the molding manufacturing system increases, and manufacturing is difficult. Significantly increased, the comprehensive manufacturing cost increased significantly. More importantly, the difficulty of propellant molding quality control is also increasing, and the risk of explosion accidents in the manufacturing process increases. For thermoplastic high-energy solid propellants with hig...

AI Technical Summary

Problems solved by technology

The introduction of solid fillers will also bring problems such as insufficient plasticization of materials, uneven dispersion of materials, and insufficient compactness of bulk materials.

At present, the main method to solve the above problems is to use larger size and higher strength molding equipment, which not only increases the manufacturing cost, but also lowers the production efficiency

In addition, the preparation of thermoplastic solid propellants by the traditional screw press process cannot achieve some variable burning rate propellant grains with complex shapes and multi-material composites.

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