초록 ▼

A method of and apparatus for casting uncured solid propellant in solid propellant rocket motors includes a casting bayonet having annular slits formed in the exit end thereof that improve the fluidity and self-leveling behavior of the uncured propellant. Both of these effects eliminate or reduce th

A method of and apparatus for casting uncured solid propellant in solid propellant rocket motors includes a casting bayonet having annular slits formed in the exit end thereof that improve the fluidity and self-leveling behavior of the uncured propellant. Both of these effects eliminate or reduce the trapping of air in the cast propellant, thus providing a better product.

대표청구항 ▼

A method of casting a solid propellant rocket motor, said motor including a casing having a bottom with a short tubular receptacle therein for receiving the end of a core member, comprising the steps of: (a) introducing uncured propellant under pressure into said motor casing through a bayonet arran

A method of casting a solid propellant rocket motor, said motor including a casing having a bottom with a short tubular receptacle therein for receiving the end of a core member, comprising the steps of: (a) introducing uncured propellant under pressure into said motor casing through a bayonet arranged in an upright position and having at least one thin slit formed in an exit end thereof with said exit end placed between said tubular receptacle and the wall of said casing, the uncured propellant in passing through said thin slit in the exit end of said bayonet becoming more fluid thereby improving the fluidity and self-leveling behavior of the propellant, whereby the propellant flows more uniformly around said tubular receptacle and minimizes any tendency for the trapping of air in the propellant and the formation of voids therein, (b) shifting the relative positions of said motor casing and said bayonet such that said bayonet is in an upright position with the exit end thereof positioned centrally of said motor casing when the level of the propellant therein rises above the tubular receptacle whereby to cause said propellant to be placed uniformly around the central area of the propellant in the motor casing, (c) relatively retracting said bayonet and motor casing as the level of propellant rises in the motor casing as required to maintain the exit end of said bayonet continually in engagement with the surface of said propellant whereby to minimize any tendency for the trapping of air and the formation of voids in said propellant, (d) introducing an elongated core member through the uncured propellant when the motor casing is filled with uncured propellant, such introduction being substantially coincident with the central axis of the motor casing with the inner end of said core member inserted into said tubular receptacle on the bottom of the motor casing, (e) curing said propellant in said motor casing with said core member therein, and (f) withdrawing said core member from the cured propellant in said motor casing.