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7.62毫米步枪(包括冲锋枪)枪管镀铬后,在枪口60°锥面与线膛交界处出现点状和线状掉铬。过去该疵病占生产总数的20％左右。为了解决这一质量问题,我们组织有关技术单位进行专门研究和攻关,使枪口掉铬率下降到5％左右。 1.对枪回掉铬原因的分析枪口掉格产生的原因是多方面的,主要有两个方面:一方面,枪口端的60°锥面与膛线交界处是一个锐棱形,而且在大生产中不可避免带有少量毛刺,无论棱角上或毛刺上的铬层都是容易脱落的;另一方面,需要电镀的时间较长,边缘效应(尖端放电)的影响非常显著,枪口棱角上的铬层要偏厚
7.62 mm rifles (including submachine guns) After the chrome barrel, punctate and linear chrome off at the junction of the 60 ° cone and the line at the muzzle. In the past the flaw accounted for about 20% of the total production. In order to solve this quality problem, we organized relevant technical units to carry out specialized research and tackling the problem, reducing muzzle clearance rate to about 5%. 1. Analysis of the cause of the gun returning to the chrome muzzle There are many reasons for the muzzle off. There are mainly two aspects: On the one hand, the junction of the 60 ° cone and the rifling at the muzzle end is a sharp prism, Large production inevitably with a small amount of glitches, regardless of edges or glitches on the burrs are easy to fall off; the other hand, the need for longer plating, the edge effect (tip discharge) is very significant impact, muzzle edges and corners On the chrome layer to partial thick