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应用比较广泛的JB-30A的冲击刀刃,是用铬钢做的,硬度为HRC59～62,使用3～5个月,打击试样4000～5000件就磨损了(图1)就得修复,经过三次修复,刀刃高度尺寸就缩小近一毫米,再使用一段时间后就要报废,给用户造成很大的不便。每个刀刃只能使用一年半左右时间,在刀刃全部寿命期间,只能打击试样12000～15000件(鞍钢提供数据),钢刀刃易磨损,是个长期存在的难题。七五年长春试验机标准审定会上、与会者都殷切希望我们能尽快地解决这一难题。为了解决冲击刀刃易磨损的质量问题,又在鞍钢同志的启示
The impact of the more widely used JB-30A blade is made of chrome steel, the hardness of HRC59 ~ 62, the use of 3 to 5 months, hit the sample 4000 to 5000 pieces of wear (Figure 1) to be repaired, after Three times to repair, the blade height size reduced by nearly one millimeter, and then scrapped after use for a period of time, causing great inconvenience to the user. Each blade can only be used for about a year and a half or so. During the entire life of the blade, it can only hit 12,000 to 15,000 samples (Anshan Iron and Steel provide data), the steel blade easy to wear, is a long-standing problem. At the validation meeting of Changchun Testing Machine in 1975, participants all earnestly hoped that we could solve this difficult problem as soon as possible. In order to solve the impact of the blade easy to wear quality problems, but also in Angang Gang comrades