Wear Characteristics of Coordinated Ammunition Ramming Mechanism in Automatic Ammunition Loading System for Artillery

doi:10.12382/bgxb.2024.0634

Abstract

Abstract:

The coordinated ammunition ramming mechanism in the automatic ammunition loading system is an important part to complete the ammunition transfer. Due to the long-term impact loads during firings, the countershaft holes of the coordinated ammunition ramming mechanism experience wear-induced clearance variations, affecting the accuracy of ammunition coordination. Studying the wear of the coordinated ammunition ramming mechanism is crucial for enhancing its reliability. To investigate the wear characteristics of the coordinated ammunition ramming mechanism, a mathematical model based on the modified Archard wear model is developed, and the wear coefficient is determined through experiments. A finite element simulation model for the mechanism’s dynamic response is established and validated using experimental data. The finite element simulation and the Arbitrary Lagrangian-Eulerian (ALE) adaptive grid technology are used to simulate the wear process, revealing the mechanism’s wear characteristics, such as the relationship between wear depth and cycle count, and the location of maximum wear. The results indicate that the initial wear is intense. After approximately 350 coordinated ammunition transfers, the wear transits from intense to steady, with the wear rate decreasing as the wear process continues. Wear at the contact edge of shaft hole is more pronounced than elsewhere throughout the wear process.

Key words: automatic ammunition loading system, coordinated ammunition ramming mechanism, Archard wear model, finite element dynamic modeling

CLC Number:

TJ301

TIAN Ye, CHEN Guangsong, LIU Taisu. Wear Characteristics of Coordinated Ammunition Ramming Mechanism in Automatic Ammunition Loading System for Artillery[J]. Acta Armamentarii, 2024, 45(11): 4062-4070.

Figures/Tables 16

Fig.1 Simplified model of coordinated ammunition ramming mechanism

Fig.2 Wear testing machine and worn specimens

Fig.3 Coordinated ammunition ramming mechanism model

Table 1 Shaft-hole material parameters

材料	密度/(kg·mm^-3)	弹性模量/MPa	泊松比
Q235B钢	7.85×10^-6	210000	0.27

Fig.4 ALE grid redrawing technique

Fig.5 Wear model and ALE grid setting

Fig.6 Simulation flowchart

Fig.7 Coordinated angle displacement curve

Table 2 Partial wear experimental data

时间间隔/s	摩擦力矩/(N·m)	实验力/N	摩擦系数	温度/℃	转速/(r·min^-1)	转数	磨损深度/mm
0010	00.496	149.7	0.3091	50	60	0010	00.030
0020	00.451	150.2	0.3066	50	60	0020	00.030
︙	︙	︙	︙	︙	︙	︙	︙
7190	01.454	150.5	0.5636	50	60	7192	00.590
7200	01.533	150.4	0.5952	50	60	7200	00.600

Fig.8 Wear curves

Fig.9 Worn circular disc

Fig.10 Wear coefficient curve

Fig.11 Wear cloud map

Fig.12 Wear depth curve

Fig.13 Wear depth fitting curve

Fig.14 Wear rate curve

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