ABSTRACT
One of the most important reasons why threaded connection is widely used is that it can provide considerable connection force, besides, it can be repeatedly disassembled and interchanged. In the field of aerospace precision instruments, there are higher requirements for the threaded connections. The precise controlling of the pretightening force has a great influence on the precision and the stability of the instrument, so that the accurate measurement of torque-preload relationship for realizing the quantitative control of assembly has the vital significance. As early as 1953, the screw torque controlling has strict and precise assembly requirements in the assembly process standard of Sidewinder missile. In the field of assembly, researches have done a lot of work in the design of threaded connection form, but rarely involves the study of the torque-preload force accuracy control, especially small size high precision thread connection. (Zaki AM, 2008) Consequently, the aim of the present work is to explore the torquepreload force mapping relationship of the miniature titanium screws in the aerospace field through theoretical analysis and experimental research.
