Test and Improvement of a Fuze MEMS Setback Arming Device Based on the EDM Process

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.

Effects of rolled fibrous microstructure on fatigue properties of extruded Cu-5Al planar micro springs

“…Kawa et al fabricated a micro spring with characteristic dimensions of 200-400 µm using the threedimensional print method [7]. To reduce fabrication errors in the UV-LIGA process, Qin et al fabricated a plane micro spring using low-speed wire electrical discharge machining [8,9]. Chen et al fabricated T2 copper planar micro springs using precision etching [10].…”

Design of a Double-Layer Electrothermal MEMS Safety and Arming Device with a Bistable Mechanism

“…Following the increasing demand for weapon performance in modern battle, the MEMS S&A devices have become a research focus due to their outstanding characteristics of micro-mechanism, integrated structure, and intelligent driving [ 1 , 2 ]. Classified by the barrier’s driving principle, the MEMS S&A devices mainly include inertial [ 3 , 4 , 5 , 6 , 7 , 8 ], electrothermal [ 9 , 10 ], electromagnetic [ 11 , 12 , 13 , 14 ], and pyrotechnic [ 15 , 16 ]. Compared with other principles, the electrothermal S&A devices are simpler in structure and gain the active control of the pyrotechnics’ condition.…”