Device for preventing gas entrapment in core inserting and propellant casting processes of solid rocket engine

Abstract

The invention provides a device for preventing gas entrapment in the core inserting and propellant casting processes of a solid rocket engine. The device comprises a wing type pressing plate (1), a material receiving disc (2) and a steering arm assembly (3). Before core inserting is carried out, the steering arm assembly (3) welded to the material receiving disc (2) is assembled, then the wing type pressing plate (1) and the material receiving disc (2) are assembled and fixedly connected, and the preparation work is completed. In a vacuum environment, after propellant is cast into an engine shell fully, a knurl setting bolt (34) and a limiting block (36) are utilized and rotated for installing the device on a casting opening (5) of the engine. When core inserting is carried out, a core die(6) enters the engine shell at a constant speed, and the propellant extruded out by the core die flows into a ring-shaped groove of the material receiving disc (2) through the circular-arc-shaped top(11) and a flow guide wall (12) of the wing type pressing plate (1) until core inserting is completed within speculated time. After core inserting is finished, the knurl setting bolt (34) is loosened, the device is taken down, and clearing and homing are carried out.

Description

technical field [0001] The invention belongs to the field of small-sized solid rocket motor grain pouring molding technology, and in particular relates to a device for preventing propellant entrainment by casting cores of solid rocket motors. Background technique [0002] The ferrule casting of solid rocket motor is also called pouring first and then ferrule, which refers to the method of pouring the propellant slurry into the combustion chamber of the engine, and then inserting the core into the combustion chamber of the engine. For a small engine with a relatively simple structure, when the maximum diameter of the mandrel is similar to the pouring diameter of the engine, and it is difficult to carry out vacuum casting with the mandrel, the core casting method is an effective grain casting method. [0003] In the actual production process of a small solid rocket motor, the charge production is completed by the production process of core casting, but sometimes there are pore...

AI Technical Summary

Problems solved by technology

In order to solve this problem, some researchers have considered solutions such as the vacuum ferrule process, but it is necessary to carry out more complex process improvement design and manufacture more complex supporting equipment

In actual production, a certain company’s solution to the air trapping phenomenon caused by the rear ferrule is to manually press the end of the slurry by hand during the ferrule process. However, due to the different experience and methods of different employees, the ferrule cannot guarantee uniformity. mass, so cannot effectively prevent air entrainment

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