Bonding forming method of silicone rubber soft mold pressing heat insulation layer

Abstract

The invention provides a bonding forming method of a silicone rubber soft mold pressing heat insulation layer. The method comprises the following steps: firstly preforming a required non-vulcanized heat insulation layer through a tool, wherein a shape, a structure, thickness and the like of the preformed heat insulation layer meet design requirements; pasting the preformed heat insulation layer ina housing of a combustion chamber, and performing pressing vulcanization under a temperature condition required by vulcanization of the heat insulation layer by taking a tool formed by a silicone rubber material with a high expansion coefficient as a pressing medium. The method can improve compactness of the heat insulation layer, ensures a high precision molding surface and thickness of the heatinsulation layer and lowers the production cost.

Description

technical field [0001] The invention relates to a method for bonding and forming a heat insulating layer. Background technique [0002] The heat insulation layer is an important part of the heat-resistant structure of the solid rocket motor. It plays the role of preventing the temperature in the combustion chamber of the engine from reaching its structural integrity, and bears the responsibility of resisting high temperature, high gas flow and particle erosion. Common thermal insulation layer bonding methods generally include patch vulcanization bonding method and preform / vulcanization bonding method, and the more common pressurization methods in the thermal insulation layer vulcanization process are airbag pressurization and vacuum autoclave pressurization. The airbag pressurization is suitable for engines that do not require high dimensional accuracy of the heat insulation layer, such as the wall-mounted pouring engine. The specific operation is to cut the heat insulation ...

AI Technical Summary

Problems solved by technology

This method is more common in the field of composite material FRP and plastic molding, but there are few reports on the molding of solid rocket motor adiabatic shells. Compared with FRP materials, the main problem is that the soft mold expands during the heating and vulcanization process of the adiabatic shell. The speed is slow, the expansion pressure of the soft mold is uncontrollable, and the heat insulation layer begins to vulcanize before reaching the design value, which will lead to low density of the heat insulation layer

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