Abstract
This paper introduces the working principle of a MEMS safety and arming (S&A) device for a fuze that is installed perpendicular to the axis of the projectile. Additionally, the application of low-speed wire electrical discharge machining (EDM) in the fabrication of the device is proposed. Microsprings are susceptible to flexural deformation and secondary deformation in the EDM process, a problem that is solved by designing the auxiliary support beam, using multiple cuts, destress annealing and optimizing the processing parameters. The difficult problem of setback slider deformation in the principle prototype test is properly solved by establishing V-shaped grooves at both ends of the setback slider. The connection mode between the microspring and the frame is changed to a clearance fit connection. The improved setback arming device can guarantee service process safety and launch reliability. The maximum overload that can be withstood in service processing is 20,000 g, and the minimum overload for safety release during launch is 12,000 g. The results show that the EDM process can greatly reduce the machining cost while improving the machining precision and machining speed, which can compensate for the defects of the current manufacturing technology.
Highlights
In recent years, with the development of intelligent ammunition technology, modern fuzes have been endowed with more functions, such as flight control, explosion point control, trajectory correction, target recognition, and positioning, in addition to state control and initiation control
The electrical discharge machining (EDM) process is successfully applied to the fabrication of a verticalframe-based setback arming device, and a mechanical impact test and centrifugal overload test are carried out on the principle prototype
The structure of the principle prototype is improved according to the problems indicated by the test, and the conclusions are as follows: 1
Summary
With the development of intelligent ammunition technology, modern fuzes have been endowed with more functions, such as flight control, explosion point control, trajectory correction, target recognition, and positioning, in addition to state control and initiation control. The scheme with a tilted micr effectively reduce the axial dimension of the device, and the verified by theoretical calculations and simulation analysis. For the fabrication of MEMS setback arming devices, nonsilicon-based micromachining technology (generally a lithography electroforming micro molding (LIGA) process or an ultraviolet-LIGA (UV-LIGA) process) and silicon-based micromachining technology (generally a deep reactive-ion etching (DRIE) process or a silicon-on-insulator (SOI) process) are commonly used The cost of these processes is high, and no cheap mass production method has been found [24,25]. The results provide technical support for promoting the application and popularization of MEMS fuzes in the field of intelligent ammunition
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