Prediction of the distribution and effect of diameters of the cylinder and the piston post-manufacture on the operation of gas-operated automatic rifles

Predicting the distribution of diameters of the cylinder inner and the piston outer post-manufacture is very important to improve the quality of the gun manufacturing process. However, it is not easy to find records related to this research. The article focuses on applying reliability and experimental statistics theory to predict the distribution of the cylinder inner diameter and the piston outer diameter post-manufacture for gas-operated automatic rifles. The influence of these dimensions on the operation of the automatic system was also studied. The influence issue was studied in five cases corresponding to the maximum, minimum, and most probable post-manufacture of the cylinder and the piston. The study object in the article is 7.62 mm AKM-1 rifles. Research results show that the cylinder inner diameter and the piston outer diameter post-manufacture of 7.62 mm AKM-1 rifles follow the normal distribution. The dynamic characteristics of the automatic system in all five cases investigated are entirely consistent with the current technical conditions for gun acceptance post-manufacture. The research results of the article can be used to establish technical conditions for new gun acceptance post-manufacture. © 2023, Publishing House of Natural Science and Technology, VAST. All rights reserved.