Design and Realization of Reliability Enhancement Test for Breech Mechanism of Large-Caliber Guns

doi:10.23940/ijpe.19.01.p12.116126

Abstract

Abstract:

To address the issue that conducting a reliability enhancement test for large-caliber guns is impossible based on actual equipment, a new kind of enhancement test bed for the breech mechanism is designed and established. By measuring the extreme working stress of the test bed, enhancement test stress and enhancement stress levels are determined. The cross sections of single stress enhancement tests and comprehensive stress enhancement tests are designed. The cartridge extracting process is selected to excite the potential failures. The wear of the shaft arm of the shell stop and the wear of the arm of the cocking shaft are measured and analyzed based on finite element analysis and micro examination tests. The practical failure process is illustrated. Under the combined action of impact sliding coupling wear and abrasive particle wear, there are flakes, pan furrows, and holes on the part surfaces, which result in outline variation and force transmission failure. The research idea of this paper provides a new kind of failure mode analysis method for large-caliber guns.

Key words: reliability enhancement test, breech mechanism, wear, simulation

Lijun Cao, Tong Xu, Chao Ding, Guibo Yu, and Shuhai Wang. Design and Realization of Reliability Enhancement Test for Breech Mechanism of Large-Caliber Guns [J]. Int J Performability Eng, 2019, 15(1): 116-126.

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Test stress	Normal stress level	Enhancement stress level
Test stress	0	1	2	3	4
The driving mass (kg)	72.5	87.8	103.1	118.4	133.7
The driving velocity (m/s)	1.124	1.183	1.21	1.252	1.269

Item	Shaft arm of shell stop		Arm of cocking shaft
Item	Worn part	New part	Worn part	New part
Weight	213.01323	215.66747	228.03660	229.73337

Element	C	Si	Mn	Cr	Ni
Percentage composition	0.32~0.40	0.17~0.37	0.25~0.5	0.9~1.3	≤0.5
Element	Mo	Cu	P	S
Percentage composition	0.2~0.3	≤0.2	≤0.025	≤0.025

Test surface	1	2	3	4
Worn area	563.1	535.7	558.3	527.6
Unworn area	458.2	458.7	452.3	463.1
Test surface	5	6	7
Worn area	559.9	565.1	559.5
Unworn area	457.1	461.9	461.9