Bauman Moscow State Technical University (Moscow, Russia):

A. S. Vasilyev, Dr. Eng., Prof., Head of the Machine-building Technology Dept.

Tula State University (Tula, Russia):
A. S. Yamnukov, Dr. Eng., Prof., Machine-building Technology Dept.
I. A. Matveev, Post-graduate, Engineer

“Splav” Scientific-production corporation (Tula, Russia):
O. A. Yamnikova, Dr. Eng., Prof., 1st category specialist in risks management, e-mail: yamnikovas@mail.ru

During assembly of rockets, the major assembly of a rocket defining its geometrical errors is the assembled propulsion section. Its accuracy is defi ned, basically, by the accuracy of production of the basic component — the extended pipe of the propulsion section having the base elements: the bourrelets. To the base component, a propulsion section pipe, attached are the other parts of the article, which are based and fixed by means of the threaded semi-locks including a combination of a buttress thread, the cylindrical centering band and a butt-end surface. Such combination of the base surfaces leads to existence of the excess connections and, consequently, to uncertainty of the connected elements position. Statistical researches of radial runouts of the base pipe of the propulsion section and runout of the central opening of the nozzle block of the propulsion section in a batch consisting of 122 assemblies have shown that dispersion of these values is within the tolerance limits and follows Rayleigh’s law that allows to assume the dominating runout of face runouts of the base surfaces of a pipe. It has been proved that more correct is check of accuracy of the base surfaces by means of the complex threaded gauges, which are simultaneously based on a thread and on a smooth internal cylindrical surface, imitating a reciprocal part. The gauges, coaxially with the threaded surface, during one step will have finished outer cylindrical and buttend surfaces, used for the runouts checks. The gauges, one at a time, are screwed into both ends of the pipe, and a special stand is used for the runouts check. Beforehand, the ovality of the bourrelet has been measured. The obtained data have been subjected to the statistical processing, as a result, found was the equation of the linear multiple regression connecting runouts of an orifice of the nozzle block in the assembled propulsion section.

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