Experimental research on bore damage of large caliber machine gun barrels

DOI:	10.11809/bqzbgcxb2023.04.001
Keywords:	bore damage; large caliber machine gun; barrel life; interior/exterior ballistics; bullet barrel coupling; experiment research
Abstract:	Aiming at the problem that the barrel life of a large caliber machine gun is significantly lower than that of the same type of a foreign gun, this paper carries out a comprehensive life test of barrels. Taking the barrels of 12.7 mm large caliber machine guns as the research objects, this paper measures or views muzzle velocity, accuracy, bore diameter and bore surface morphology of each barrel at each life period before the end of life. Through an in depth analysis of the results of the comprehensive life test of the barrels, main damage forms of the barrel bore of the large caliber machine guns are acquired, and the consistency of the life limit and damage forms of the barrel bore under the same manufacturing process is verified. The following conclusions can be acquired: even wear and local damage are the main forms of bore damage; according to different damage laws, a barrel can be divided into four areas axially. The axial length of each area is different, and the damage in the bore shows great difference among these four areas. The experiment results can provide a basis for the establishment of an accurate model of damaged barrel/gun interaction.
Issue:	Vol. 44 No. 4 (2023)
Published:	2023-04-28
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