Tool for bulging forming of internal heat insulating layer in medium-and-small-sized solid-propellant rock engine

The invention relates to a tool for bulging forming of an internal heat insulating layer in a medium-and-small-sized solid-propellant rock engine. The tool for the bulging forming of the internal heat insulating layer in the medium-and-small-sized solid-propellant rock engine comprises a heat insulating shell, a combined mould core which is arranged in the heat insulating shell and used for performing the bulging forming on the heat insulating layer, and a bulging cone which is inserted into the combined mould core and used for performing the bulging forming on the combined mould core, wherein the combined mould core is of a tubular structure, an inner hole of the combined mould core is a tapered hole matched with the bulging cone, and the bulging cone is connected with a pressurization tool; and the combined mould core is formed by combining more than two wedge-shaped mould cores with a matched mould core arranged between two adjacent wedge-shaped mould cores. The tool for the bulging forming of the internal heat insulating layer in the medium-and-small-sized solid-propellant rock engine has the advantages that accurate integral forming of various heat insulating layer structures can be realized, the compact structure of the heat insulating layer can be guaranteed, and the anti-ablation and anti-erosion performances of the heat insulating structures can be improved.