Emergency Configuration Design of Breechblock Firing Mechanism Based on Selective Laser Melting Technology

doi:10.12382/bgxb.2023.0683

Abstract

Abstract:

It takes a long time to manufacture the breechblock firing pushrods by using the selective laser melting technology in wartime. An emergency configuration design method of breechblock firing pushrod based on the selective laser melting technology is proposed. The impact resistance of lattice structure and the feasibility of applying it to emergency configuration design are studied by finite element simulation and impact test. An emergency configuration of split firing pushrod is designed by using a static simulation method, and a mechanical performance test is designed to verify whether its mechanical properties and service performance meet the requirements. The results show that, among the four lattice structures of body-centered cubic (BCC), body-centered cubic with Z-rod (BCC_Z), face-centered cubic (F₂CC) and face-centeredcubic with Z-rod (F₂CC_Z), BCC_Z has better comprehensive performance and better impact resistance. Compared with the original firing pushrod, the manufacturing time of the emergency configuration firing pushrod is reduced by 21.56%, its volume is reduced by 25.65%, and the maximum impact load is reduced by 32.14%. After 100 times of repeated switch latch test experiments, there is no obvious wear on the surface of the emergency configuration firing pushrod, which has good service performance and meets the requirements of use. The effectiveness of the design method of the emergency configuration firing pushrod for battlefield repair is verified.

Key words: breechblock, firing pushrod, selective laser melting, lattice structure, emergency manufacture

CLC Number:

TJ33

JIA Changzhi, SHEN Xiaolong, CHENG Yangyang, YI Yali, WU Menglei, JIN Herong. Emergency Configuration Design of Breechblock Firing Mechanism Based on Selective Laser Melting Technology[J]. Acta Armamentarii, 2024, 45(9): 3044-3055.

Figures/Tables 26

Fig.1 Split design of firing pushrod

Table 1 316L stainless material parameters

抗拉强度/MPa	屈服强度/MPa	泊松比	位移上限/mm
703	576	0.3	0.5

Table 2 Dynamic constitutive model parameters of 316L stainless steel

ρ₀/ (kg·m^-3)	E/ GPa	μ	A/ GPa	B/ GPa	C	m	n
7900	180	0.3	0.492	0.812	0.0124	0.91	0.99

Fig.2 Four lattice elements

Fig.3 Model meshing

Fig.4 Model boundary conditions

Fig.5 Displacement nephogram of four lattice structures

Fig.6 Stress nephogram of four lattice structures

Fig.7 Displacement-load curve of impact hammer

Fig.8 Four kinds of lattice structure impact specimens

Fig.9 Impact fracture diagram of lattice specimens

Fig.10 Impact load-displacement curves of four lattice structures

Fig.11 Static analysis nephogram of entity firing pushrod

Fig.12 Displacement nephograms of lattice structure impact head before and after optimization

Fig.13 Base displacement and stree nephograms aftervoptimization

Fig.14 Displacement nephogram of emergency configuration firing pushrod

Table 3 Preparation of firing putter

类型		高度/ mm	体积/ mm³	时间/ min
应急构型击发推杆	冲击头	15.5	573.5	131
	底座	49.0	6064.5
击发推杆原件		67.5	8927.7	167

Fig.15 Firing pushrod sample

Fig.16 Impact morphology of impact head (left: the overall morphology diagram, right: cushion warping angle diagram)

Fig.17 Load-displacement curves of impact heads of lattice structure and solid structure

Fig.18 Compression morphology of firing push rod

Fig.19 Load-displacement curve of pushrod compression test

Fig.20 Shear fracture morphology of lattice structure

Fig.21 SEM fracture morphology of compression specimen

Fig.22 Firing pushrod assembly verification platform

Fig.23 Wear morphology of firing pushrod

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